CN216480898U - Novel yellow phosphorus tail gas burning power generation boiler - Google Patents

Abstract

The utility model discloses a novel power generation boiler for combusting yellow phosphorus tail gas, which comprises a combustor, a pipeline system and a boiler body, wherein the double-drum natural circulation and boiler body are arranged in a boiler with a main sectional view of ┃ ┃ ┃: the boiler body structure is characterized in that a high-temperature boiler tube bundle is arranged in the middle, a hearth is arranged on the right side of the high-temperature boiler tube bundle, a low-temperature boiler tube bundle is arranged on the left side of the high-temperature boiler tube bundle, a small boiler tube of the low-temperature boiler tube bundle is lower and smaller than a large boiler tube of the high-temperature boiler tube bundle, a special water spray temperature reduction system is arranged on a superheater, tubes of all heating surfaces of a boiler are designed to be multiple corrosion-resistant, and access door holes, spaces and channels are formed in the periphery of the heating surfaces. The problems of low evaporation capacity, less power generation, poor superheated steam regulation performance, low thermal efficiency and poor social benefit, economic benefit and environmental benefit caused by difficult maintenance of the conventional yellow phosphorus tail gas power generation boiler are solved.

Description

Novel yellow phosphorus tail gas burning power generation boiler

Technical Field

The utility model relates to the technical field of boilers, in particular to a novel yellow phosphorus tail gas combustion power generation boiler.

Background

For a long time, in the phosphorus chemical industry of China, a large amount of combustible phosphorus tail gas (containing a basic low calorific value Qnet, ar is 1200KJ/Nm3, the components are 89-91% of CO, and the other components mainly comprise S: 3-13g/Nm3, As:0.07-0.08g/Nm3 and P:0.5-3g/Nm3) is associated in the process of smelting phosphorus ore, the phosphorus tail gas is conveyed to the upper air outside a factory building through a pipeline for combustion, the combustion heat is not utilized, the white waste is caused, and the atmospheric greenhouse effect is aggravated. Under the guidance of national political guidelines on energy conservation and emission reduction and sustainable development, a yellow phosphorus tail gas combustion power generation boiler is developed in the boiler industry before 2016 years, and is continuously put into operation in yellow phosphorus production enterprises, so that the problems of early failure and short service life caused by serious corrosion of flue gas sides of tubes in a hearth water wall, a superheater and a boiler tube bundle which are necessary for the power generation boiler are solved to a certain extent, and meanwhile, the problems of difficulty in overheat steam temperature overtemperature regulation, corrosion perforation of a left header and a right header of a convection tube bundle and the like also occur, so that the problems of difficulty in overheat steam temperature overtemperature regulation, corrosion perforation of the header and the like need to be comprehensively solved, and the yellow phosphorus tail gas combustion power generation boiler is expected to have more advanced and reliable structure and performance.

The Chinese invention application CN102175019A discloses a power generation boiler burning yellow phosphorus tail gas, but the boiler has the problems that a lower header of a boiler tube bundle is corroded and perforated, the steam temperature of superheated steam is difficult to adjust and the like, and the boiler tube bundle in the patent has the defects that: the distance between the vertical wall surface of the outermost pipe of the left convection bank close to the left side wall and the vertical central line of the left header is 85.5 mm, the distance between the vertical wall surface of the outermost pipe of the right convection bank close to the right side wall and the vertical central line of the right header is 85.5 mm on the left side of the vertical central line of the left header in the same way, and the distance between the vertical wall surface of the outermost pipe of the right convection bank and the vertical central line of the right header is right side of the vertical central line of the right header, namely the inclined wall surface below the vertical wall surface is right above the left header and the right header; all the tubes of the convection tube bundle pass through inclined wall surfaces below vertical wall surfaces of left and right side walls of a flue of the boiler tube bundle and are led into the left and right headers, and when the boiler is started and runs with low load, all corrosive liquids condensed on all the tubes directly flow onto outer cylindrical surfaces of the left and right headers through the inclined walls and are led to an outer cylindrical surface corrosion perforation accident of the left and right headers; the disadvantages of the surface type desuperheater in the patent are: saturated steam in a large boiler barrel on a boiler tube bundle is uniformly distributed into an inlet header of a low-temperature superheater by three communicating pipes, the saturated steam flows through a coiled pipe in the low-temperature superheater and is heated into superheated steam by smoke outside the coiled pipe, superheated steam at an outlet of the low-temperature superheater is regulated by an upper inlet surface type desuperheater, the superheated steam passes through the outer surface of a heat transfer area pipe in the surface type desuperheater from top to bottom, 105 ℃ boiler feed water enters the inner heat area pipe of the surface type desuperheater, and redundant heat of the superheated steam outside the pipe is taken away, so that the temperature of the superheated steam is reduced; the adjustment inertia is large due to the large thermal resistance between steam and water, the rapid reduction of the steam temperature of the hot steam is difficult to realize by increasing the water supply quantity, and the practice proves that: a surface type desuperheater for a power generation boiler burning yellow phosphorus tail gas has poor effect of adjusting the steam temperature of superheated steam, and therefore a novel power generation boiler burning yellow phosphorus tail gas is provided.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a novel yellow phosphorus tail gas combustion power generation boiler, which has the advantages of providing a power generation boiler product which uses yellow phosphorus tail gas after combustion and purification as fuel and has more excellent performance for phosphorus chemical enterprises, not only having large boiler evaporation capacity, more power generation and high thermal efficiency, but also having excellent performance of superheated steam temperature regulation, safety, reliability, long service life and the like, makes an innovative breakthrough for effective utilization of yellow phosphorus tail gas heat and atmospheric environment protection, and solves the problems of low evaporation capacity, less power generation, difficult regulation of superheated steam temperature, lower boiler thermal efficiency and poorer social benefit, economic benefit and environmental benefit caused by corrosion and perforation of a boiler tube bundle header before the yellow phosphorus tail gas power generation boiler is used.

In order to achieve the purpose, the utility model provides the following technical scheme: a novel power generation boiler burning yellow phosphorus tail gas comprises a burner, a hearth, a transverse straight flue, a superheater, a high-temperature superheater, a low-temperature superheater, a high-temperature boiler tube bundle, a high-temperature convection tube bundle tube, a first maintenance section, a cooling chamber, a communicating flue, a low-temperature boiler tube bundle, a low-temperature convection tube bundle tube, a second maintenance section, a ninety-degree bent tube, a heat pipe exchanger, a water-cooled wall, an outlet tube bundle, a hearth right water-cooled wall lower header, a hearth ash accumulation liquid pit, a hearth left water-cooled wall lower header, a superheater outlet header, a high-temperature superheater inlet header, an upper-lower outlet water-spraying temperature-reducing header, a lower-lower outlet water-spraying temperature-reducing header, a low-temperature superheater inlet header, three communicating tubes, a large boiler barrel, a lead-out tube, a small boiler barrel, left and right water-cooled wall upper headers, a phi 450 round manhole, an inclined boiler bottom, a first left and right header, an access door, a first ash accumulation liquid pit, a left and right side wall of the high-temperature boiler tube bundle, a second boiler, a third boiler, a fourth boiler, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a sixth, a fifth, a fourth, The second left and right header, the second ash accumulation liquid pit, the choke ring, the left and right side walls of the low-temperature boiler tube bundle; the boiler body is generally arranged to be composed of a hearth, a superheater, a high-temperature boiler tube bundle and a low-temperature boiler tube bundle, the double-drum natural circulation and the boiler body are generally arranged to be a boiler with a main depression section view of both '┃ ┃ ┃' -shaped structures, namely the boiler body is structurally characterized in that the high-temperature boiler tube bundle is arranged in the middle, the hearth is arranged on the right side of the high-temperature boiler tube bundle, and the low-temperature boiler tube bundle is arranged on the left side of the high-temperature boiler tube bundle; the diameter of the small boiler tube of the low-temperature boiler tube bank is smaller than that of the large boiler tube of the high-temperature boiler tube bank, and the horizontal center line elevation of the small boiler tube of the low-temperature boiler tube bank is lower than that of the large boiler tube of the high-temperature boiler tube bank; the superheater is composed of a high-temperature superheater and a low-temperature superheater and is arranged in the horizontal straight flue, the superheater is provided with a special water spraying temperature reduction system, and the water spraying temperature reduction system is composed of an upper lower outlet water spraying temperature reduction header and a lower outlet water spraying temperature reduction header; the pipes on each heating surface of the boiler adopt a multiple corrosion-resistant design, and access door holes, spaces and channels are arranged around the heated pipes; the combustor is arranged on the front wall of the hearth, a transverse straight flue is arranged at an outlet at the rear end in the hearth, and the outlet end of the transverse straight flue is connected with a high-temperature boiler tube bundle; the high-temperature boiler tube bundle is internally and sequentially provided with a high-temperature convection tube bundle tube, a first maintenance section, a cooling chamber and a wall tube in the high-temperature convection tube bundle from front to back, the outlet end of the high-temperature boiler tube bundle is connected with a communicating flue, the outlet end of the communicating flue is provided with a low-temperature boiler tube bundle, and the low-temperature boiler tube bundle is internally and sequentially provided with a low-temperature convection tube bundle tube, a second maintenance section and a wall tube in the low-temperature convection tube bundle from front to back; a hearth right water-cooled wall lower collection box and a hearth left water-cooled wall lower collection box are respectively arranged in the hearth, left and right side walls and a rear wall in the hearth are provided with water-cooled walls, an outlet pipe group is arranged at the rear part of the left side wall water-cooled wall, a hearth ash accumulation pit is arranged at the lower part of the left side wall water-cooled wall, the cross section of the hearth ash accumulation pit is in an inverted right trapezoid shape, the lower side of the inverted right trapezoid is an ash accumulation pit flat bottom surface, all the ash accumulation pits are built by refractory bricks, and left and right water-cooled wall upper collection boxes are also arranged in the hearth; the lower extreme of high temperature boiler tube bank is provided with first deposition hydrops hole, be down isosceles trapezoid on the first deposition hydrops hole cross section and be the rectangle combination down, be deposition hydrops hole flat bottom below the rectangle, it builds by laying bricks or stones for whole refractory bricks, still be provided with high temperature boiler tube bank left and right sides wall in the high temperature boiler tube bank, the lower extreme of low temperature boiler tube bank is provided with second deposition hydrops hole, be down isosceles trapezoid on the second deposition hydrops hole cross section and be the rectangle combination down, be deposition hydrops hole flat bottom below the rectangle, it builds by laying bricks or stones for whole refractory bricks or stones, still be provided with low temperature boiler tube bank left and right sides wall in the low temperature boiler tube bank.

As a further aspect of the utility model: the superheater comprises a high-temperature superheater and a low-temperature superheater, a low-temperature superheater inlet header, a high-temperature superheater inlet header, a superheater outlet header and a water spray attemperation system are further arranged in the superheater, and the water spray attemperation system comprises an upper lower outlet water spray attemperation header and a lower outlet water spray attemperation header.

As a further aspect of the utility model: the high-temperature boiler tube bundle is arranged between the outlet of the low-temperature superheater of the superheater and the inlet of the communicating flue, and the overlooking cross section of the high-temperature boiler tube bundle is a rectangular cross section; the high-temperature boiler tube bundle is arranged between the large boiler barrel and the first left and right header, and a first ash accumulation liquid accumulation pit is arranged below the high-temperature boiler tube bundle; a wall-close pipe furnace wall in the high-temperature convection pipe bundle pipe, a heat insulation layer at the bottom of the large boiler barrel and a first ash accumulation and liquid accumulation pit form a closed space; the horizontal section of the high-temperature boiler tube bundle is a rectangular section, and the rectangular section is internally provided with from front to back: the high-temperature convection tube bundle pipe is communicated with the space of the front section of the inlet of the flue, four groups of high-temperature convection tube bundle pipes, three first overhauling sections and the cooling chamber; each group of high-temperature convection tube bundle tubes consists of four arranged rows of tubes, each row of tubes consists of seven tubes which are transversely and symmetrically arranged, the tubes in each group of high-temperature convection tube bundle tubes are longitudinally and transversely in-line, and the outermost tubes of the high-temperature convection tube bundle tubes are called as wall-leaning tubes; the high-temperature convection tube bundle tubes are provided with left and right high-temperature boiler tube bundle side walls close to the outside of the wall tube, the first left and right headers are in a cylindrical hollow tube structure, the distance between the outer cylindrical surface of the high-temperature convection tube bundle tubes close to the outside of the wall tube and the outer cylindrical surface of the first left and right headers is more than sixty-four millimeters, the vertical wall surfaces of the left and right high-temperature boiler tube bundle side walls are arranged on one side of the symmetrical center line of the outer cylindrical surface of the first left and right headers, and seventy-one-to-four percent of the tubes in the high-temperature convection tube bundle tubes penetrate through the vertical surfaces of the left and right high-temperature boiler tube bundle side walls and are introduced into the first left and right headers; the lower part of each pipe in the high-temperature convection tube bundle pipe is additionally provided with a choke ring, the choke ring is made of corrosion-resistant materials with the thickness of concentric circles with different diameters being larger than three millimeters, when the boiler is started and runs with low load, condensate is formed on overhead pipes in wall-close pipes and other pipes in the high-temperature convection tube bundle pipe, and the condensate can be guided and dripped into a first ash accumulation liquid pit through the choke ring on the pipe, so that the condensate cannot be dripped onto the outer cylindrical surface of a first left collecting box and a second left collecting box to cause corrosion perforation of the outer wall of the first left collecting box and the right collecting box. The large boiler barrel and the low-temperature superheater inlet header are connected through three communicating pipes.

As a further aspect of the utility model: the low-temperature boiler tube bundle is arranged between the outlet of the communicating flue and the inlet of the ninety-degree elbow, and the overlooking cross section of the low-temperature boiler tube bundle is a rectangular cross section; the low-temperature boiler tube bundle is arranged between the small boiler barrel and the second left and right header, and a second ash deposition liquid accumulation pit is arranged below the low-temperature boiler tube bundle; the wall close to the low-temperature boiler tube bundle, the heat insulation layer at the bottom of the small boiler barrel and the second ash accumulation liquid accumulation pit form a closed space; the horizontal section of the low-temperature boiler tube bundle is a rectangular section, and the rectangular section is internally provided with the following components from front to back: the front space of the flue outlet, eight groups of low-temperature convection tube bundles and seven second overhaul sections are communicated; each group of low-temperature convection tube bundle tubes consists of four rows of tubes which are longitudinally arranged, each row of tubes consists of seven tubes which are transversely symmetrically arranged, the tubes in each group of low-temperature convection tube bundle tubes are longitudinally and transversely in-line, and the outermost tubes of the low-temperature convection tube bundle tubes are called as wall tubes; the low-temperature convection tube bundle tubes are provided with left and right low-temperature boiler tube bundle side walls close to the outside of the wall tube, the second left and right headers are of a cylindrical hollow tube structure, the distance between the outer cylindrical surface of the low-temperature convection tube bundle tubes close to the outside of the wall tube and the outer cylindrical surface of the second left and right headers is more than sixty-four millimeters, the vertical wall surfaces of the left and right low-temperature boiler tube bundle side walls are arranged on one side of the symmetrical center line of the outer cylindrical surface of the second left and right headers, and seventy-one-to-four percent of the tubes in the low-temperature convection tube bundle tubes penetrate through the vertical surfaces of the left and right low-temperature boiler tube bundle side walls and are introduced into the second left and right headers; the lower part of each pipe in the low-temperature convection pipe bundle is additionally provided with a choke ring, and when the boiler is started and runs at low load; the small boiler barrel is connected with the large boiler barrel through a plurality of eduction tubes.

As a further aspect of the utility model: the water-cooled wall and outlet pipe group, the high-temperature superheater and the low-temperature superheater are all made of corrosion-resistant steel pipes, and particularly, the corrosion-resistant steel pipes are adopted as the pipes in the special-temperature convection pipe bundle pipe and the low-temperature convection pipe bundle pipe.

As a further aspect of the utility model: two phi 450 circular manholes are formed in the lower portion of the rear wall of the superheater, and inclined furnace bottoms are arranged at the bottoms of the high-temperature superheater and the low-temperature superheater.

As a further aspect of the utility model: the upper part of the small boiler barrel is connected with an eduction tube, one end of the eduction tube is led into the horizontal central line of the large boiler barrel, and the horizontal central line elevation of the small boiler barrel is lower than that of the horizontal central line of the large boiler barrel, so that the elevation difference is more than 1.3 m.

As a further aspect of the utility model: the furnace chamber, the superheater, the high-temperature superheater, the low-temperature superheater and the high-temperature boiler tube bank are internally provided with a first maintenance section and a second maintenance section, and the front wall and the rear wall of the high-temperature boiler tube bank and the low-temperature boiler tube bank are respectively provided with an access door.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model, after purifying yellow phosphorus tail gas and air enter the burner through respective pipeline and mix and then burn in the burner hearth, after the combustion flame and flue gas are absorbed by the water wall and the outlet tube group of the burner hearth in the burner hearth, the high temperature flame and flue gas enter the rear part of the burner hearth in turn in a straight line direction and then enter and transversely scour the outlet tube group of the burner hearth, the transverse straight section flue, and then transversely scour the high temperature superheater and the low temperature superheater, the flue gas continues to enter the inlet on the right side of the rear part of the high temperature boiler tube group: flue gas enters a cooling chamber from the right side and turns ninety degrees, then transversely erodes four groups of convection tube bundle tubes and three maintenance sections, after turning ninety degrees at the front part of a high-temperature boiler tube bundle, the flue gas enters a communicating flue from the right side to flow in a straight direction from the left side to the right side, after the flue gas enters the front end of a low-temperature boiler tube bundle and turns ninety degrees again, the flue gas sequentially transversely erodes eight groups of low-temperature convection tube bundle tubes and seven maintenance sections from the front to the back, then leaves a boiler body, and after the flue gas absorbs heat step by step through each heating surface of the boiler body, finally enters a ninety degree elbow, absorbs heat through a heat pipe heat exchanger at the tail part of the boiler, is pumped to a chimney through a steel flue and is exhausted into the atmosphere; during debugging, the maximum evaporation capacity of a single boiler reaches 30 tons/hour, the operating pressure of the boiler is 2.5 MPa, the temperature of superheated steam reaches more than 450 ℃, the temperature of the superheated steam can be easily controlled by adjusting the water injection quantity of the water injection temperature reduction system, the boiler is debugged and operated successfully at one time, and four headers are operated for 20 months without damage; the two power generation boilers for burning yellow phosphorus tail gas, which are put into operation and have the rated evaporation capacity of 25 tons/hour, the rated pressure of 2.5 MPa and the rated steam of 485 ℃ of the boiler, are taken as examples to illustrate the social, economic and environmental benefits obtained by the utility model. The yellow phosphorus tail gas is changed into valuable, and the economic benefits are as follows: total rated evaporation capacity of the two boilers: 50 tons/hr, installed capacity: 15000kw, when the yellow phosphorus tail gas is sufficient, the generated energy per hour is 1.35 ten thousand DEG, the generated energy per 24 hours is 32.4 ten thousand DEG, the electricity price per degree is calculated according to 0.5 yuan, and the electricity generation income is 16.2 yuan; generating capacity is 9720 ten thousand degrees calculated according to 300 days every year, and generating income is 4860 ten thousand yuan; the yellow phosphorus tail gas is used as the boiler fuel without coal, and the economic benefits are as follows: if the boiler burns class II bituminous coal, the low calorific value of the class II bituminous coal is 18090 kilo-joules/kilogram, the boiler consumes 5039.9 kilograms of class II bituminous coal every hour, the boiler continuously operates for 300 days for 24 hours, and 36287.3 tons of class II bituminous coal are consumed in the year; the price of each ton of the II-class bituminous coal is 2000 yuan, the total cost of purchasing the II-class bituminous coal in the year is 726 ten thousand yuan, and 5586 ten thousand yuan is obtained in the two terms; the environmental protection benefit of the yellow phosphorus combustion tail gas is as follows: the utility model burns yellow phosphorus tail gas to generate electricity, the exhaust gas temperature of the boiler is 160 ℃, the high-temperature smoke gas emission of the original yellow phosphorus tail gas after burning in the air reduces the pollution to the atmosphere and the aggravation of the greenhouse effect of the atmosphere, meanwhile, 36287.3 tons of second-class bituminous coal are not needed to be burnt to generate electricity, and the precious non-renewable coal resources are saved; the pollution of smoke dust and nitrogen oxides generated when 36287.3 tons of class II bituminous coal are combusted is avoided, and the greenhouse effect is aggravated; social benefits are as follows: the yellow phosphorus tail gas is effectively utilized and 36287.3 tons of II-type bituminous coal is saved in the air. In conclusion, the social benefit, the economic benefit and the environmental benefit are great.

Drawings

FIG. 1 is a cross-sectional view taken along line A-A of the present invention;

FIG. 2 is a cross-sectional view taken along line B-B of the present invention;

FIG. 3 is a view of the utility model in the direction of C;

FIG. 4 is a schematic block diagram of a superheater system of the present invention;

FIG. 5 is an enlarged view of a portion of the utility model D;

FIG. 6 is an enlarged view of a portion E of the present invention.

In the figure: 1-a burner; 2-hearth; 3-horizontally arranging a straight flue; 4-a superheater; 5-high temperature superheater; 6-low temperature superheater; 7-high temperature boiler tube bundle; 8-high temperature convection bank tubes; 9-a first overhaul section; 10-a cooling chamber; 11-a communicating flue; 12-a bank of low temperature boilers; 13-low temperature convection bank tubes; 14-a second service section; a 15-ninety degree bend; 16-heat pipe heat exchangers; 17-water cooled wall; 18-an outlet tube set; 19-a lower collection box of a right water-cooled wall of the hearth; 20-furnace ash deposition and liquid accumulation pit; 21-a lower collection box of a left water-cooled wall of a hearth; 22-superheater outlet header; 23-high temperature superheater inlet header; 24-spraying water from the upper part to the lower part through an outlet to reduce the temperature of the header; 25-lower water spraying temperature reduction header through outlet; 26-a low temperature superheater inlet header; 27-three communicating tubes; 28-large drum; 29-an extraction pipe; 30-small drum; 31-left and right water-cooled wall upper header; a 32-phi 450 circular manhole; 33-inclined hearth; 34-a first left and right header; 35-an access door; 36-a first ash accumulation liquid pit; 37-left and right side walls of the high-temperature boiler tube bundle; 38-second left and right headers; 39-second ash accumulation liquid accumulation pit; 40-a bluff ring; 41-left and right side walls of the low-temperature boiler tube bundle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to the attached drawings 1-6, a novel yellow phosphorus tail gas burning power generation boiler comprises a burner 1, a pipeline system and a boiler body, wherein the boiler body is generally arranged to be composed of a hearth 2, a superheater 4, a high-temperature boiler tube bundle 7 and a low-temperature boiler tube bundle 12, the main sectional view of the double-drum natural circulation and the boiler body are both ┃ ┃ ┃ -shaped boilers, namely the boiler body is structurally characterized in that the high-temperature boiler tube bundle 7 is arranged in the middle, the hearth 2 is arranged on the right side of the high-temperature boiler tube bundle 7, and the low-temperature boiler tube bundle 12 is arranged on the left side of the high-temperature boiler tube bundle 7; the diameter of the small boiler 30 of the low-temperature boiler bank 12 is smaller than that of the large boiler 28 of the high-temperature boiler bank 7, and the horizontal central line elevation of the small boiler 30 of the low-temperature boiler bank 12 is lower than that of the large boiler 28 of the high-temperature boiler bank 7; the superheater 4 consists of a high-temperature superheater 5 and a low-temperature superheater 6 and is arranged in the horizontal straight flue 3, the superheater 4 is provided with a special water spraying temperature reduction system, and the water spraying temperature reduction system consists of an upper lower outlet water spraying temperature reduction header 24 and a lower outlet water spraying temperature reduction header 25; the pipes on each heating surface of the boiler adopt a multiple corrosion-resistant design, and access door holes, spaces and channels are arranged around the heated pipes; the combustor 1 is installed on the front wall of a hearth 2, a transverse straight flue 3 is arranged at an outlet at the rear end in the hearth 2, and the outlet end of the transverse straight flue 3 is connected with a high-temperature boiler tube bundle 7; the high-temperature boiler tube bundle 7 is internally and sequentially provided with a high-temperature convection tube bundle tube 8, a first overhaul section 9, a cooling chamber 10 and a wall tube in the high-temperature convection tube bundle tube 8 from front to back, the outlet end of the high-temperature boiler tube bundle 7 is connected with a communicating flue 11, the outlet end of the communicating flue 11 is provided with a low-temperature boiler tube bundle 12, and the low-temperature boiler tube bundle 12 is internally and sequentially provided with a low-temperature convection tube bundle tube 13, a second overhaul section 14 and a wall tube in the low-temperature convection tube bundle tube 13 from front to back; a hearth right water-cooled wall lower collection box 19 and a hearth left water-cooled wall lower collection box 21 are respectively arranged in the hearth 2, the left and right side walls and the rear wall in the hearth 2 are provided with water-cooled walls 17, the rear part of the left side wall water-cooled wall 17 is provided with an outlet pipe group 18, the lower part of the left side wall water-cooled wall is provided with a hearth ash accumulation pit 20, the cross section of the hearth ash accumulation pit 20 is in an inverted right trapezoid, the lower side of the inverted right trapezoid is the flat bottom surface of the ash accumulation pit, all the hearth is built by refractory bricks, and a left and right water-cooled wall upper collection box 31 is also arranged in the hearth 2; the lower extreme of high temperature boiler tube bank 7 is provided with first deposition hydrops hole 36, be down isosceles trapezoid on the 36 cross sections of first deposition hydrops hole and be the rectangle combination down, be deposition hydrops hole bottom below the rectangle, it builds by laying bricks or stones for whole, still be provided with high temperature boiler tube bank left and right sides wall 37 in high temperature boiler tube bank 7, the lower extreme of low temperature boiler tube bank 12 is provided with second deposition hydrops hole 39, be down isosceles trapezoid on the 39 cross sections of second deposition hydrops hole and be the rectangle combination down, be deposition hydrops hole bottom below the rectangle, it builds by laying bricks or stones for whole to be able to bear or endure firebrick, still be provided with low temperature boiler tube bank left and right sides wall 41 in low temperature boiler tube bank 12.

Preferably, in fig. 3 and 4, the superheater 4 is composed of a high-temperature superheater 5 and a low-temperature superheater 6, a low-temperature superheater inlet header 26, a high-temperature superheater inlet header 23, a superheater outlet header 22 and a specific water spray attemperation system are further arranged in the superheater 4, and the specific water spray attemperation system comprises an upper lower outlet water spray attemperation header 24 and a lower outlet water spray attemperation header 25; saturated steam in a large boiler barrel 28 on the high-temperature boiler tube bank 7 is uniformly distributed into a low-temperature superheater inlet header 26 of a low-temperature superheater 6 by three communicating tubes 27, the saturated steam flows through a serpentine tube in the low-temperature superheater 6 and is heated by smoke outside the serpentine tube to form superheated steam, the superheated steam is divided into two paths of equivalent and simultaneously enters an upper low-outlet water spraying temperature-reducing header 24 and a lower low-outlet water spraying temperature-reducing header 25, two electric valves on a water spraying temperature-reducing water pipeline are simultaneously opened, 105 ℃ demineralized water is pressurized by a water pump and is atomized into fog-shaped water by a spray head, the fog-shaped water and the superheated steam are mixed in the same direction and move forwards to adjust the temperature of the superheated steam at the outlet of the low-temperature superheater 6 to be low, the fog-shaped water and the superheated steam oppositely and simultaneously enter the high-temperature superheater inlet header 23, the superheated steam enters the serpentine tube in the high-temperature superheater 5 from the high-temperature superheater inlet header 23 and flows through the serpentine tube and is heated by the smoke outside the serpentine tube to be equal to the deviation range of the superheated steam at 450 ℃, ensuring that the steam temperature of the superheated steam of 450 ℃ enters the superheater outlet header 22 of the high-temperature superheater 5 in a deviation range and is led out to a steam turbine generator; the deviation range of the superheated steam temperature reaching 450 ℃ is realized by adjusting the amount of 105 ℃ desalted water entering the upper and lower water-spraying temperature-reducing header tanks 24 and 25 through the outlets, and practice proves that: the water spray desuperheater has the characteristics of sensitive regulation of the steam temperature of the superheated steam, large temperature regulation range, high automation degree and the like, and realizes that the steam temperature of the superheated steam is convenient to achieve controllability and adjustability.

Preferably, in fig. 1, the high-temperature boiler tube bundle 7 is arranged between the outlet of the low-temperature superheater 6 of the superheater 4 and the inlet of the communicating flue 11, and the top cross section of the high-temperature boiler tube bundle 7 is a rectangular cross section; in fig. 2, the high-temperature boiler tube bundle 7 is arranged between the large drum 28 and the first left and right header 34, and a first ash accumulation liquid accumulation pit 36 is arranged below the high-temperature boiler tube bundle 7; the furnace wall of the high-temperature convection tube bundle 8 close to the wall tube, the heat insulation layer at the bottom of the large boiler barrel 28 and the first ash accumulation liquid accumulation pit 36 form a closed space; the horizontal section of the high-temperature boiler tube bundle 7 is a rectangular section, and the rectangular section is internally provided with the following components from front to back: the system comprises an inlet front section space communicated with a flue 11, four groups of high-temperature convection tube bundles 8, three first overhauling sections 9 and a cooling chamber 10; each group of high-temperature convection tube bundle tubes 8 consists of four arranged rows of tubes, each row of tubes consists of seven tubes which are transversely and symmetrically arranged, the tubes in each group of high-temperature convection tube bundle tubes 8 are longitudinally and transversely in-line, and the tubes on the outermost side of the high-temperature convection tube bundle tubes 8 are called as wall tubes; in fig. 5, the high-temperature convection bank tubes 8 are provided with left and right high-temperature boiler bank side walls 37 outside the tubes, the first left and right headers 34 are cylindrical hollow tube structures, the distance between the outer cylindrical surfaces of the high-temperature convection bank tubes 8 outside the tubes and the outer cylindrical surfaces of the first left and right headers 34 is greater than sixty-four millimeters, the vertical wall surfaces of the left and right high-temperature boiler bank side walls 37 are both on one side of the symmetric center line of the outer cylindrical surfaces of the first left and right headers 34, and seventy-one-to-four percent of the high-temperature convection bank tubes 8 are led into the first left and right headers 34 after passing through the vertical surfaces of the left and right high-temperature boiler bank side walls 37; the lower part of each pipe in the high-temperature convection tube bundle pipe is additionally provided with a choke ring 40, the choke rings 40 are made of corrosion-resistant materials with the thickness of concentric circles with different diameters being more than three millimeters, when the boiler is started and runs at low load, condensate is formed on the pipes close to the wall in the high-temperature convection tube bundle pipe 8 and other pipes in the high-temperature convection tube bundle pipe 8, and the condensate can be guided by the choke rings 40 on the pipes and can drop into the first ash accumulation pit 36, so that the condensate can not drop onto the outer cylindrical surface of the first left and right headers 34 to cause corrosion perforation of the outer wall of the first left and right headers 34. The large drum 28 and the low-temperature superheater inlet header 26 are connected through three communicating pipes 27.

Preferably, in fig. 1, the low-temperature boiler tube bundle 12 is arranged between the outlet of the communicating flue 11 and the inlet of the ninety-degree elbow 15, and the top cross section of the low-temperature boiler tube bundle 12 is a rectangular cross section; in fig. 2, the low-temperature boiler bank 12 is arranged between the small boiler 30 and the second left and right header 38, and a second ash accumulation liquid pit 39 is arranged below the low-temperature boiler bank; the wall tube furnace wall of the low-temperature boiler tube bundle 12, the heat insulation layer at the bottom of the small boiler barrel 30 and the second ash accumulation liquid accumulation pit 39 form a closed space; the horizontal section of the low-temperature boiler tube bundle 12 is a rectangular section, and the rectangular section is internally provided with the following components from front to back: the front space of the outlet of the flue 11, eight groups of low-temperature convection tube bundles 13 and seven second overhaul sections 14 are communicated; each group of low-temperature convection tube bundle pipes 13 consists of four rows of pipes which are longitudinally arranged, each row of pipes consists of seven pipes which are transversely symmetrically arranged, the pipes in each group of low-temperature convection tube bundle pipes 13 are longitudinally and transversely in-line, and the outermost pipes of the low-temperature convection tube bundle pipes 13 are called as wall-leaning pipes; in fig. 6, the low-temperature convection bank tubes 13 are provided with left and right low-temperature boiler bank side walls 41 close to the outside of the tubes, the second left and right headers 38 are in a cylindrical hollow tube structure, the distance between the outer cylindrical surface of the low-temperature convection bank tubes 13 close to the outside of the tubes and the outer cylindrical surface of the second left and right headers 38 is greater than sixty-four millimeters, the vertical wall surfaces of the left and right low-temperature boiler bank side walls 41 are all on one side of the symmetric center line of the outer cylindrical surface of the second left and right headers 38, and seventy-one-and-four percent of the low-temperature convection bank tubes 13 pass through the vertical surfaces of the left and right low-temperature boiler bank side walls 41 and then are introduced into the second left and right headers 38; the lower part of each pipe in the low-temperature convection pipe bundle is additionally provided with a choke ring 40, when the boiler is started and runs at low load, condensate is formed on the wall-close pipe in the low-temperature convection pipe bundle 13 and other pipes in the low-temperature convection pipe bundle 13, and can be guided by the choke ring 40 on the pipes to drip into the second ash accumulation pit 39, and cannot drip onto the outer cylindrical surface of the second left and right header 38 to cause corrosion perforation of the outer wall of the second left and right header 34; the small boiler barrel 30 is connected with the large boiler barrel 28 through a plurality of outlet pipes 29.

Preferably, the water-cooled wall 17, the outlet pipe group 18, the high-temperature superheater 5 and the low-temperature superheater 6 are made of corrosion-resistant steel pipes, and particularly, the corrosion-resistant steel pipes are adopted in the special-temperature convection pipe bundle 8 and the low-temperature convection pipe bundle 13, so that the corrosion resistance of various pipes is obviously enhanced, and the effective service life of the boiler is prolonged as much as possible.

Preferably, the lower part of the rear wall of the superheater 4 is provided with two phi 450 circular manholes 32, the front and rear walls of the high-temperature boiler bank 7 and the low-temperature boiler bank 12 are provided with access doors 35, and the bottoms of the high-temperature superheater 5 and the low-temperature superheater 6 are provided with inclined furnace bottoms 33; through the round manhole 32 with the diameter of 450, a furnace operator can enter the space between the left side of the hearth 2 and the right side of the high-temperature superheater 5 and between the high-temperature superheater 5 and the low-temperature superheater 6, and the furnace operator can overhaul the superheater in two places, and enters the left side of the low-temperature superheater 6 from the access door 35 on the rear wall of the high-temperature boiler tube bank 7 to overhaul the low-temperature superheater; the lower parts of the high-temperature superheater 5 and the low-temperature superheater 6 are provided with the inclined furnace bottom 33, so that condensate can be accumulated on the coiled pipe surface of the high-temperature superheater and the low-temperature superheater and fall on the inclined furnace bottom 33, and the accumulated condensate can flow into the lower furnace ash accumulation liquid pit 20 of the furnace 2 again.

Preferably, the upper part of the small boiler barrel 30 is connected with an outlet pipe 29, one end of the outlet pipe 29 is led into the horizontal center line of the large boiler barrel 28, because the elevation of the horizontal center line of the small boiler barrel 30 is lower than that of the horizontal center line of the large boiler barrel 28, the elevation difference is more than 1.3 m, the steam-water mixture in the small boiler barrel 30 is led into the horizontal center line of the large boiler barrel 28 through the outlet pipe 29, the small boiler barrel 30 and various pipes of the low-temperature boiler bank 12 are filled with water all the time, the reliable cooling of the pipes of the low-temperature convection pipe bundle pipes 13 in the low-temperature boiler bank 12 is ensured, the long-term safe operation can be realized, the temperature of the flue gas at the outlet of the low-temperature boiler bank 12 is controlled at 400 ℃ when the design is carried out, and the low-temperature corrosion of the pipes in the low-temperature convection pipe bundle pipes 13 in the low-temperature boiler bank 12 is ensured.

Preferably, the hearth 2, the superheater 4, the high-temperature superheater 5 and the low-temperature superheater 6, a first maintenance section 9 is arranged in the high-temperature boiler tube bank 7, and a second maintenance section 14 is arranged in the low-temperature boiler tube bank 12, the front wall and the rear wall of the high-temperature boiler tube bank 7 and the front wall and the rear wall of the low-temperature boiler tube bank 12 are respectively provided with an access door 35, maintenance channels and spaces are reserved among the maintenance sections, the access doors and heating surfaces, so that corroded and perforated tubes can be conveniently and quickly checked and replaced, a large amount of maintenance time is saved, the power generation operation time is increased, the power generation benefit of the boiler is improved, and the boiler is different from the technical characteristics of a boiler burning clean gas fuel.

The embodiment of the utility model is debugged and operated, the purified yellow phosphorus tail gas and air enter the combustor 1 through respective pipelines to be mixed and then are combusted in the hearth 2, after combustion flame and smoke are absorbed by a water wall 17 and an outlet pipe group 18 in the hearth 2, high-temperature flame and smoke linearly and sequentially enter the rear part of the hearth, turn ninety degrees and then enter the outlet of the hearth and transversely scour the outlet pipe group 18, a transverse straight section flue 3, a transverse high-temperature superheater 5 and a low-temperature superheater 6, and then the smoke continuously enters the right inlet at the rear part of a high-temperature boiler pipe bundle 7: flue gas enters a cooling chamber 10 from the right side and turns ninety degrees, then transversely erodes four groups of convection tube bundle tubes 8 and three overhaul sections 9, the flue gas enters a communicating flue 11 from the right side to the left side after turning ninety degrees in the front part of a high-temperature boiler tube bundle 7 and flows in the straight direction, when the flue gas enters the front end inlet of a low-temperature boiler tube bundle 12 and turns ninety degrees again, eight groups of low-temperature convection tube bundle tubes 13 and seven overhaul sections 14 are sequentially and transversely eroded in the forward direction and then leave a boiler body, the flue gas absorbs heat step by step through each heating surface of the boiler body, finally enters a ninety degree elbow 15 and a heat pipe heat exchanger 16 at the tail part of the boiler to absorb heat, and is pumped to a chimney through a steel flue to be discharged into the atmosphere; during debugging, the maximum evaporation capacity of a single boiler reaches 30 tons/hour, the operating pressure of the boiler is 2.5 MPa, the temperature of superheated steam reaches more than 450 ℃, the temperature of the superheated steam can be easily controlled by adjusting the water injection quantity of the water injection temperature reduction system, the boiler is debugged and operated successfully at one time, and four headers are operated for 20 months without damage; the two power generation boilers for burning yellow phosphorus tail gas, which are put into operation and have the rated evaporation capacity of 25 tons/hour, the rated pressure of 2.5 MPa and the rated steam of 485 ℃ of the boiler, are taken as examples to illustrate the social, economic and environmental benefits obtained by the utility model. The yellow phosphorus tail gas is changed into valuable, and the economic benefits are as follows: total rated evaporation capacity of the two boilers: 50 tons/hr, installed capacity: 15000kw, when the yellow phosphorus tail gas is sufficient, the generated energy per hour is 1.35 ten thousand DEG, the generated energy per 24 hours is 32.4 ten thousand DEG, the electricity price per degree is calculated according to 0.5 yuan, and the electricity generation income is 16.2 yuan; generating capacity is 9720 ten thousand degrees calculated according to 300 days every year, and generating income is 4860 ten thousand yuan; the yellow phosphorus tail gas is used as the boiler fuel without coal, and the economic benefits are as follows: if the boiler burns class II bituminous coal, the low calorific value of the class II bituminous coal is 18090 kilo-joules/kilogram, the boiler consumes 5039.9 kilograms of class II bituminous coal every hour, the boiler continuously operates for 300 days for 24 hours, and 36287.3 tons of class II bituminous coal are consumed in the year; the price of each ton of the II-class bituminous coal is 2000 yuan, the total cost of purchasing the II-class bituminous coal in the year is 726 ten thousand yuan, and 5586 ten thousand yuan is obtained in the two terms; the environmental protection benefit of the yellow phosphorus combustion tail gas is as follows: the utility model burns yellow phosphorus tail gas to generate electricity, the exhaust gas of the boiler is 160 ℃, the high-temperature smoke gas emission of the original yellow phosphorus tail gas after burning in the air reduces the pollution to the atmosphere and the aggravation of the greenhouse effect of the atmosphere, meanwhile, 36287.3 tons of power generation are not needed to burn II-class bituminous coal, thereby saving precious non-renewable coal resources; the pollution of smoke dust and nitrogen oxides generated when 36287.3 tons of class II bituminous coal are combusted is avoided, and the greenhouse effect is aggravated; social benefits are as follows: the yellow phosphorus tail gas is effectively utilized and 36287.3 tons of II-type bituminous coal is saved in the air. In conclusion, the social benefit, the economic benefit and the environmental benefit are great.

Claims (8)

1. The utility model provides a novel power generation boiler of yellow phosphorus tail gas of burning, combustor (1), furnace (2), horizontal straight flue (3), over heater (4), high temperature over heater (5), low temperature over heater (6), high temperature boiler tube bank (7), high temperature convection bank of tubes (8), first maintenance section (9), cooling chamber (10), intercommunication flue (11), low temperature boiler tube bank (12), low temperature convection bank of tubes (13), second maintenance section (14), ninety degree return bend (15), heat pipe exchanger (16), water-cooling wall (17), export group of tubes (18), collection box (19) under the furnace right water-cooling wall, furnace deposition hydrops (20), collection box (21) under the furnace left water-cooling wall, over heater export collection box (22), high temperature over heater import collection box (23), go up to pass export water spray attemperation collection box (24), lower pass export water spray attemperation collection box (25) down, The system comprises a low-temperature superheater inlet header (26), three communicating pipes (27), a large boiler barrel (28), an outlet pipe (29), a small boiler barrel (30), left and right water-cooled wall upper headers (31), a phi 450 round manhole (32), an inclined boiler bottom (33), a first left and right header (34), an access door (35), a first ash accumulation liquid pit (36), left and right side walls (37) of a high-temperature boiler tube bank, a second left and right header (38), a second ash accumulation liquid pit (39), a choke ring (40) and left and right side walls (41) of the low-temperature boiler tube bank; the method is characterized in that: the boiler body is generally arranged to be composed of a hearth (2), a superheater (4), a high-temperature boiler tube bundle (7) and a low-temperature boiler tube bundle (12), the boiler body is of a structure with a main depression section view of both '┃ ┃ ┃' in a double-drum natural circulation mode and the boiler body, namely, the boiler body is structurally provided with the high-temperature boiler tube bundle (7) in the middle, the hearth (2) is arranged on the right side of the high-temperature boiler tube bundle (7), and the low-temperature boiler tube bundle (12) is arranged on the left side of the high-temperature boiler tube bundle (7); the diameter of a small boiler barrel (30) of the low-temperature boiler tube bank (12) is smaller than that of a large boiler barrel (28) of the high-temperature boiler tube bank (7), and the horizontal central line elevation of the small boiler barrel (30) of the low-temperature boiler tube bank (12) is lower than that of the large boiler barrel (28) of the high-temperature boiler tube bank (7); the superheater (4) consists of a high-temperature superheater (5) and a low-temperature superheater (6) and is arranged in the horizontal straight flue (3), the superheater (4) is provided with a special water spraying temperature reduction system, and the water spraying temperature reduction system consists of an upper lower outlet water spraying temperature reduction header (24) and a lower outlet water spraying temperature reduction header (25); the pipes on each heating surface of the boiler adopt a multiple corrosion-resistant design, and access door holes, spaces and channels are arranged around the heated pipes; the combustor (1) is arranged on the front wall of the hearth (2), a transverse straight flue (3) is arranged at an outlet at the rear end in the hearth (2), and the outlet end of the transverse straight flue (3) is connected with a high-temperature boiler tube bundle (7); high-temperature convection bank tubes (8), a first overhaul section (9), a cooling chamber (10) and wall tubes in the high-temperature convection bank tubes (8) are sequentially arranged in the high-temperature boiler bank (7) from front to back, an outlet end of the high-temperature boiler bank (7) is connected with a communicating flue (11), a low-temperature boiler bank (12) is arranged at an outlet end of the communicating flue (11), and low-temperature convection bank tubes (13), a second overhaul section (14) and wall tubes in the low-temperature convection bank tubes (13) are sequentially arranged in the low-temperature boiler bank (12) from front to back; a hearth right water-cooled wall lower header (19) and a hearth left water-cooled wall lower header (21) are respectively arranged in the hearth (2), the left and right side walls and the rear wall in the hearth (2) are provided with water-cooled walls (17) and the rear part of the left side wall water-cooled wall (17) is provided with an outlet pipe group (18), the lower part of the hearth is provided with a hearth ash accumulation liquid pit (20), the cross section of the hearth ash accumulation liquid pit (20) is in an inverted right trapezoid shape, the lower side of the inverted right trapezoid shape is an ash accumulation liquid pit flat bottom surface, all the hearth is built by refractory bricks, and a left and right water-cooled wall upper header (31) is also arranged in the hearth (2); the lower extreme of high temperature boiler tube bank (7) is provided with first deposition hydrops hole (36), be down isosceles trapezoid on first deposition hydrops hole (36) cross section and be the rectangle combination down, be deposition hydrops hole flat bottom below the rectangle, it builds by laying bricks or stones for whole refractory bricks, still be provided with high temperature boiler tube bank left and right sides wall (37) in high temperature boiler tube bank (7), the lower extreme of low temperature boiler tube bank (12) is provided with second deposition hydrops hole (39), be down isosceles trapezoid on second deposition hydrops hole (39) cross section and be the rectangle combination down, be deposition hydrops hole flat bottom below the rectangle, it builds by laying bricks or stones for refractory bricks or stones for whole, still be provided with left and right sides wall (41) of low temperature boiler tube bank in low temperature boiler tube bank (12).

2. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the superheater (4) comprises a high-temperature superheater (5) and a low-temperature superheater (6), a low-temperature superheater inlet header (26), a high-temperature superheater inlet header (23), a superheater outlet header (22) and a water spray attemperation system are further arranged in the superheater (4), and the water spray attemperation system comprises an upper lower outlet water spray attemperation header (24) and a lower outlet water spray attemperation header (25).

3. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the high-temperature boiler tube bundle (7) is arranged between the outlet of the low-temperature superheater (6) of the superheater (4) and the inlet of the communicating flue (11), and the overlooking cross section of the high-temperature boiler tube bundle (7) is a rectangular cross section; the high-temperature boiler tube bank (7) is arranged between the large boiler barrel (28) and the first left and right header tanks (34), and a first ash deposition liquid accumulation pit (36) is arranged below the high-temperature boiler tube bank (7); a wall tube furnace wall in the high-temperature convection tube bundle tube (8), a heat insulation layer at the bottom of the large boiler barrel (28) and a first ash accumulation liquid accumulation pit (36) form a closed space; the horizontal section of the high-temperature boiler tube bundle (7) is a rectangular section, and the rectangular section is internally provided with the following components from front to back: the device comprises an inlet front section space communicated with a flue (11), four groups of high-temperature convection tube bundles (8), three first overhauling sections (9) and a cooling chamber (10); each group of high-temperature convection tube bundle pipes (8) consists of four arranged pipes, each arranged pipe consists of seven pipes which are transversely and symmetrically arranged, the pipes in each group of high-temperature convection tube bundle pipes (8) are longitudinally and transversely in-line, and the outermost pipes of the high-temperature convection tube bundle pipes (8) are called as wall-leaning pipes; high-temperature boiler tube bank left and right side walls (37) are arranged outside the high-temperature convection tube bank tubes (8) close to the wall tubes, the first left and right headers (34) are of a cylindrical hollow tube structure, the distance between the outer cylindrical surface of the high-temperature convection tube bank tubes (8) close to the wall tubes and the outer cylindrical surface of the first left and right headers (34) is more than sixty-four millimeters, the vertical wall surfaces of the high-temperature boiler tube bank left and right side walls (37) are arranged on one side of the symmetrical center line of the outer cylindrical surface of the first left and right headers (34), and seventy-one-to-four percent of the high-temperature convection tube bank tubes (8) penetrate through the vertical surfaces of the high-temperature boiler tube bank left and right side walls (37) and then are introduced into the first left and right headers (34); when the boiler is started and operates under low load, condensate is formed on the tubes close to the wall in the high-temperature convection tube bundle tube (8) and other tubes in the high-temperature convection tube bundle tube (8) in the air and can be guided by the flow blocking rings (40) on the tubes to drip into the first ash accumulation liquid pit (36) without dripping onto the outer cylindrical surface of the first left and right header (34) to cause corrosion perforation of the outer wall of the first left and right header (34); the large boiler barrel (28) is connected with the low-temperature superheater inlet header (26) through three communicating pipes (27).

4. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the low-temperature boiler tube bundle (12) is arranged between the outlet of the communicating flue (11) and the inlet of the ninety-degree elbow (15), and the top-view cross section of the low-temperature boiler tube bundle (12) is a rectangular cross section; the low-temperature boiler tube bundle (12) is arranged between the small boiler barrel (30) and the second left and right header (38), and a second ash deposition liquid accumulation pit (39) is arranged below the low-temperature boiler tube bundle; a wall tube furnace wall of the low-temperature boiler tube bundle (12), a heat insulation layer at the bottom of the small boiler barrel (30) and a second ash accumulation liquid accumulation pit (39) form a closed space; the horizontal section of the low-temperature boiler tube bundle (12) is a rectangular section, and the rectangular section is internally provided with the following components from front to back: the front space of the outlet of the flue (11), eight groups of low-temperature convection tube bundles (13) and seven second overhaul sections (14) are communicated; each group of low-temperature convection tube bundle pipes (13) consists of four rows of pipes which are longitudinally arranged, each row of pipes consists of seven pipes which are transversely symmetrically arranged, the pipes in each group of low-temperature convection tube bundle pipes (13) are longitudinally and transversely in-line, and the outermost pipes of the low-temperature convection tube bundle pipes (13) are called as wall-leaning pipes; the left and right side walls (41) of the low-temperature boiler tube bank are arranged outside the low-temperature convection tube bank tubes (13) close to the wall tubes, the second left and right headers (38) are of a cylindrical hollow tube structure, the distance between the outer cylindrical surface of the low-temperature convection tube bank (13) close to the wall tubes and the outer cylindrical surface of the second left and right headers (38) is more than sixty-four millimeters, the vertical wall surfaces of the left and right side walls (41) of the low-temperature boiler tube bank are arranged on one side of the symmetric central line of the outer cylindrical surface of the second left and right headers (38), and seventy-one-and-four percent of the low-temperature convection tube bank tubes (13) penetrate through the vertical surfaces of the left and right side walls (41) of the low-temperature boiler tube bank and then are introduced into the second left and right headers (38); the lower part of each pipe in the low-temperature convection pipe bundle is additionally provided with a choke ring (40) when the boiler is started and operates at low load; the small boiler barrel (30) is connected with the large boiler barrel (28) through a plurality of eduction tubes (29).

5. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the water-cooled wall (17), the outlet pipe group (18), the high-temperature superheater (5) and the low-temperature superheater (6) are made of corrosion-resistant steel pipes, and particularly, the corrosion-resistant structure and the corrosion-resistant steel pipes are adopted in the tubes in the special-temperature convection tube bundle tube (8) and the low-temperature convection tube bundle tube (13).

6. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: two phi 450 circular manholes (32) are formed in the lower portion of the rear wall of the superheater (4), and inclined furnace bottoms (33) are arranged at the bottoms of the high-temperature superheater (5) and the low-temperature superheater (6).

7. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the upper part of the small boiler barrel (30) is connected with an outlet pipe (29), one end of the outlet pipe (29) is led into the horizontal central line of the large boiler barrel (28), and the elevation difference is more than 1.3 m because the elevation of the horizontal central line of the small boiler barrel (30) is lower than that of the horizontal central line of the large boiler barrel (28).

8. The novel yellow phosphorus-fired tail gas power generation boiler as claimed in claim 1, wherein: the boiler is characterized in that a first maintenance section (9) and a second maintenance section (14) are arranged in a hearth (2), a superheater (4), a high-temperature superheater (5), a low-temperature superheater (6) and a high-temperature boiler tube bundle (7), and a front wall and a rear wall of the high-temperature boiler tube bundle (7) and the low-temperature boiler tube bundle (12) are provided with maintenance doors (35).

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