CN112555809B - Biomass layer combustion boiler of high-temperature ultrahigh-pressure reheating-free system - Google Patents
Biomass layer combustion boiler of high-temperature ultrahigh-pressure reheating-free system Download PDFInfo
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- CN112555809B CN112555809B CN201910850175.4A CN201910850175A CN112555809B CN 112555809 B CN112555809 B CN 112555809B CN 201910850175 A CN201910850175 A CN 201910850175A CN 112555809 B CN112555809 B CN 112555809B
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- 239000002028 Biomass Substances 0.000 title claims abstract description 73
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 46
- 239000000446 fuel Substances 0.000 claims abstract description 116
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000003546 flue gas Substances 0.000 claims abstract description 86
- 238000003303 reheating Methods 0.000 claims abstract description 18
- 230000008021 deposition Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims description 43
- 239000002184 metal Substances 0.000 claims description 43
- 238000007789 sealing Methods 0.000 claims description 36
- 238000012544 monitoring process Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 23
- 238000013016 damping Methods 0.000 claims description 22
- 239000000779 smoke Substances 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 11
- 238000005536 corrosion prevention Methods 0.000 claims description 10
- 230000004927 fusion Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 229910000639 Spring steel Inorganic materials 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 8
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 238000010257 thawing Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 9
- 239000002585 base Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B30/00—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber
- F23B30/02—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts
- F23B30/06—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone
- F23B30/08—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details or component parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Solid-Fuel Combustion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention provides a biomass layer combustion boiler without a reheating system at high temperature and ultra high pressure, which comprises an air distribution system, a flue gas system and a steam-water system, wherein the air distribution system comprises a fuel bearing part, a vibration damper, a force bearing structure and an air supply device; the flue gas system comprises a first flue gas channel, a second flue gas channel, a third flue gas channel, a fourth flue gas channel, a fifth flue gas channel and a corner ash deposition structure; the steam-water system comprises a water-cooled wall, a first stage superheater, a second stage superheater, a third stage superheater, a fourth stage superheater, a boiler barrel, an economizer, a first low-temperature economizer, a second low-temperature economizer and an external water heating medium air preheater. The invention can fully utilize various technical advantages of the layer combustion boiler, improve new steam parameters of the boiler, reduce energy consumption of a unit, avoid technical risks caused by using a reheating system, and simplify and optimize the system and structure of the whole boiler.
Description
Technical Field
The invention relates to a biomass layer combustion boiler of a high-temperature ultrahigh-pressure reheating-free system.
Background
The biomass fuel such as agricultural straw, forestry waste and the like is directly combusted in a boiler to generate steam for power generation or cogeneration, so that the method is an optimal method for solving the problem of agricultural and forestry waste outlet at present.
Direct combustion of biomass fuels requires specialized boiler equipment. The selection of a suitable biomass boiler is considered from three aspects of boiler form, new steam parameters and whether a reheating system is provided.
In terms of boiler formats, there are two types of boiler formats currently most used in the industry: layer combustion boilers and circulating fluidized bed boilers. The technical advantages of the layer combustion boiler are long continuous operation time, good fuel adaptability, lower operation technical difficulty and the like, and the actual application quantity of the layer combustion boiler in the biomass direct combustion industry is slightly more than that of the circulating fluidized bed boiler at present.
In the aspect of new steam parameters, the new steam parameters of the boiler belong to high-temperature and ultrahigh-pressure grades, and are one grade higher than the most common high-temperature and high-pressure parameters (the temperature of the new steam is about 540 ℃ and the pressure is about 9.2MPa (g)) in the current biomass direct-combustion industry. The higher the new steam parameter, the higher the overall plant power generation efficiency.
In terms of whether a reheating system is arranged, the reheating system is arranged for reducing the steam humidity of the final stage of the steam turbine and avoiding damage to the final stage blades caused by water attack. However, the reheating system of the biomass boiler has serious alkali metal high-temperature corrosion problem. When the corrosion is to a certain degree, the reheater tube bundle can burst, and the boiler can only be shut down for overhauling, so that economic loss is caused to equipment users. This problem has become the primary technical risk of selecting reheat units.
According to the analysis, the biomass layer combustion boiler without the reheating system provided by the invention not only fully plays various technical advantages of the layer combustion boiler, but also improves the thermal economy of a unit by improving new steam parameters of the boiler, avoids technical risks caused by using the reheating system, and greatly improves the reliability of boiler equipment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a biomass layer combustion boiler without a reheating system at high temperature and ultra-high pressure, and the biomass layer combustion boiler without the reheating system at high temperature and ultra-high pressure is characterized by comprising an air distribution system, a flue gas system and a steam-water system; the air distribution system comprises a fuel bearing component 11, a vibration reduction device 12, a force bearing structure 13 and an air supply device 14 which are sequentially arranged from top to bottom; the flue gas system comprises a first flue gas channel 21, a second flue gas channel 22, a third flue gas channel 23, a fourth flue gas channel 24, a corner ash deposition structure 26 and a fifth flue gas channel 25 which are sequentially connected in a penetrating manner; The steam-water system comprises a water cooling wall 31, a first-stage superheater 35, a second-stage superheater 34, a third-stage superheater 32, a fourth-stage superheater 33, a boiler barrel 40, an economizer 36, a first low-temperature economizer 37, a second low-temperature economizer 38 and an external water heating medium air preheater 39; the fuel bearing component 11, the vibration reduction device 12 and the force bearing structure 13 are arranged in the first flue gas channel 21, and the third-stage superheater 32 is arranged above the fuel bearing component 11 and positioned in the first flue gas channel 21; the fourth stage superheater 33 is disposed within the second flue gas channel 22; The second stage superheater 34 and the first stage superheater 35 are disposed within the third flue gas channel 23; the economizer arrangement 36 is within the fourth flue gas channel 24; a first low-temperature economizer 37 is arranged below the economizer arrangement 36 and in the fourth flue gas channel 24, the second low-temperature economizer 38 being arranged in the fifth flue gas channel 25; the biomass fuel is combusted on the fuel bearing component 11 to generate high-temperature flue gas, the high-temperature flue gas flows upwards through the third-stage superheater 32, then flows downwards through the fourth-stage superheater 33, then flows upwards through the second-stage superheater 34 and the first-stage superheater 35, and releases heat to the water cooling walls 31 on the first flue gas channel 21, the second flue gas channel 22 and the third flue gas channel 23 in the flowing process of the high-temperature flue gas; The high-temperature flue gas continuously flows downwards through the economizer 36 and the first low-temperature economizer 37, then flows upwards through the second low-temperature economizer 38 through the corner ash deposition structure 26, and finally is discharged out of the biomass grate-fired boiler, so that heat carried by the high-temperature flue gas is transferred to steam-water working media in the steam-water system; and a part of the high-pressure feed water firstly enters the external water heating medium air preheater 39 to heat primary air and secondary air required by fuel combustion, the temperature of the high-pressure feed water is reduced, then the high-pressure feed water firstly enters the second low-temperature economizer 38 and the first low-temperature economizer 37 in sequence to absorb the heat of flue gas, and the temperature of the high-pressure feed water is increased and then enters the economizer 36; Another portion of the high pressure feedwater directly enters the economizer 36; the two parts of high-pressure feed water are converged in the economizer 36 and then flow into the boiler drum 40; the steam separated by the drum 40 passes through the first stage superheater 35, the second stage superheater 34, the third stage superheater 32 and the fourth stage superheater 33 in sequence to form high-temperature and ultrahigh-pressure grade new steam; the water separated by the drum 40 enters the water cooling wall 31 through a pipe to absorb the heat of the flue gas in the first flue gas channel 21, the second flue gas channel 22 and the third flue gas channel 23 again, and the water flows back to the drum 40 for separation after forming a steam-water mixture.
Preferably, the new steam temperature is 540 ℃ and the pressure is 13.44MPa (g).
Preferably, the new steam enters the steam turbine to apply work and drive the generator to generate electricity.
Preferably, the air supply device 14 includes an air duct 141, an air duct branch 142 and an air chamber 143; the air chamber 143 is arranged below the fuel carrying component 11; wherein the number of the air pipes 141 is only one, the number of the air pipe branches 142 is N, the number of the fuel bearing components 11 is N, and the number of the air chambers 143 is N multiplied by N, wherein N is more than or equal to 2; the air chambers 143 are vertically and horizontally arranged in a mode of N transverse air chambers and N longitudinal air chambers; the air duct 141 is communicated with the air chamber 143 through the air duct shunt 142; and the primary air for supporting combustion enters the air chamber 143 below the fuel bearing component 11 from the air pipes 141 through the air pipe branches 142 respectively, and then passes through the fuel bearing component 11 to be mixed with the fuel above for supporting combustion.
Preferably, a damper 145 is provided in the air duct branch 142, an air inlet 146 is provided in the air chamber 143, and the air inlet 146 of the air chamber 143 below the air duct 141 is sized larger for the fuel carrying component 11 away from the air duct 141; for the fuel bearing component 11 near the air duct 141, the air inlet 146 of the air chamber 143 below it may be sized smaller to achieve uniformity of the air inlet below the fuel bearing component 11.
Preferably, the fuel carrying component 11 is fastened to the force carrying structure 13 by the vibration damping device 12; the vibration damping device 12 is provided in an S-shape, and includes a first connecting portion 1221 concavely extending to the right and a second connecting portion 1222 concavely extending to the left, and a vibration damping spring steel plate 1223 is provided between the first connecting portion 1221 and the second connecting portion 1222; the damping device 12 is fixed to the fuel carrier 11 by the first connection 1221 and to the force-bearing structure 13 by the second connection 1222.
Preferably, the number of the vibration damping devices 12 is plural, and the vibration damping spring steel plates 1223 are disposed in parallel between the fuel bearing member 11 and the force bearing structure 13, and are formed by stacking a plurality of thin steel plates.
Preferably, the first stage superheater 35 and the second stage superheater 34 are fastened to the waterwall bundles 354 by metal hanging plates 351 and metal hooks 352 corresponding to the metal hanging plates 351; wherein the metal hanging plate 351 is arranged on the water wall pipe bundle 354 near the elbow of the first stage superheater 35 and the second stage superheater 34; the metal hooks 352 are provided on the bends of the first stage superheater 35 and the second stage superheater 34.
Preferably, the surface contact type sealing device further comprises a surface contact type sealing device, wherein the surface contact type sealing device comprises a left side fuel bearing component 111, a right side fuel bearing component 112, a supporting spring 113, a connecting piece 114, a main sealing component 115, a left side auxiliary sealing component 116, a right side auxiliary sealing component 117 and a base 118; wherein the left side fuel bearing part 111 and the right side fuel bearing part 112 are respectively arranged at equal heights, and are connected with the base 118 through the connecting piece 114; the supporting spring 113 is disposed between the left side fuel bearing member 111 and the right side fuel bearing member 112, one end of the supporting spring 113 is connected to the base 118, and the main seal member 115 is disposed on the other end of the supporting spring 113; the left side sub seal member 116 and the right side sub seal member 117 are respectively disposed opposite to the adjacent both side surfaces of the main seal member 115, and are simultaneously connected to the left side fuel carrying member 111 and the right side fuel carrying member 112, respectively.
Preferably, the left side secondary seal member 116 is welded to the left side fuel carrying member 111 on the rim side; the right side secondary seal 117 is welded to the right side fuel carrying member 112 along the sides thereof.
Preferably, the main sealing member 115, the left side auxiliary sealing member 116 and the right side auxiliary sealing member 117 are made of square steel, and the main sealing member 115 is disposed at an angle of forty-five degrees to the horizontal plane.
Preferably, the device also comprises a build-up welding and fusion corrosion prevention device for the water-cooled wall of the high-temperature area of the hearth, wherein the device comprises a water tank 312, a water pump 313 and an external pipeline 314; wherein, the water-cooled wall 31 is made by alternately welding metal sheets 3111 and metal pipes 3122; the metal pipe 3122 of the water-cooled wall 31 is connected to the water tank 312 and the water pump 313 through the external pipe 314; the surfacing welding and corrosion preventing treatment is carried out, meanwhile, water is introduced into the treatment area for cooling, the water after heat absorption is collected into the water tank 312, after the temperature is reduced, the water is pumped out by the water pump 313 and is pumped back into the metal pipeline 3122 of the water cooling wall 31 through the external pipeline 314, and heat absorption is repeated in a circulating manner.
Preferably, the area range of the water-through cooling is enlarged to prevent the peripheral area of the treatment area from being damaged at high temperature due to good heat conduction characteristics of the metal.
Preferably, the nickel-based alloy is adopted as the material for the surfacing and the melting layer has the thickness of 1.5-2 mm.
Preferably, the dual protection fire protection device is characterized by comprising a plugboard door 41, an actuating mechanism 42, a pressure monitoring component 43 and a temperature monitoring component 44; wherein, the flashboard door 41 is controlled by the actuating mechanism 42 and is used for opening or closing the blanking port 45; disposing the pressure monitoring part 43 in the biomass grate-fired boiler; providing the temperature monitoring means 44 on a feeding device 46 where fuel enters the inlet of the biomass grate-fired boiler; and simultaneously transmits the measured pressure signal and the measured temperature signal to the actuator 42 in real time as control signals for controlling the insert plate door 41.
Preferably, when the positive pressure value in the biomass grate-fired boiler reaches a threshold value, the pressure value is detected by the pressure monitoring component 43, a pressure signal is transmitted to the actuating mechanism 42, and the actuating mechanism 42 drives the insert plate door 41 to close a part of the blanking port 45.
Preferably, if the temperature monitoring unit 44 also detects that the temperature has reached the threshold value, the actuator 42 drives the gate 41 to completely close the blanking port 45 under the control of the temperature signal.
Preferably, the number of the pressure monitoring components 43 is plural, the number of the temperature monitoring components 44 is plural, the actuator 42 is a pneumatic actuator, and the insert door 41 is a pneumatic insert door.
Compared with the prior art, the invention has the following beneficial effects:
1. The biomass layer combustion boiler without the reheating system adopts the high-temperature and ultrahigh-pressure parameters, and compared with a high-temperature and high-pressure parameter unit, the pressure of new steam is improved by about 4.2MPa, so that the efficiency of the whole generator unit can be improved. The unit can use less fuel on the premise of emitting the same electric quantity, and saves fuel cost for biomass generator enterprises.
2. The biomass layer combustion boiler without the reheating system adopts the reheating system, effectively solves the problem that a reheater of the boiler with the reheating system is corroded by alkali metal at high temperature to explode pipes, simplifies the boiler system and structure, and ensures that the boiler runs more safely and permanently.
3. The biomass layer combustion boiler without the reheating system adopts a five-channel mode, and the arrangement of the heating surface of the low-temperature economizer is increased to fully absorb the waste heat of the flue gas, so that the boiler efficiency reaches about 90.7 percent and is higher than the current highest efficiency value 89 percent of the high-temperature high-pressure layer combustion boiler.
4. The biomass layer combustion boiler provided by the invention adopts the external water heating medium air preheater, and is different from the conventional method of arranging the air preheater in a boiler tail flue, so that the air preheater is prevented from suffering low-temperature corrosion.
Drawings
Fig. 1 is a schematic diagram of a biomass grate-fired boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 2 is a schematic diagram of an air supply device of a biomass grate-fired boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 3 is a schematic diagram of a damping device of a biomass layer combustion boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 4 is a plan view showing an installation mode of a superheater of a biomass layer combustion boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 5 is a schematic diagram of the installation mode of the superheater of the biomass layer combustion boiler with the high-temperature ultrahigh-pressure reheating-free system.
FIG. 6 is a schematic diagram showing the connection relationship between a metal hanging plate and a water wall tube bundle of a superheater of a biomass layer combustion boiler with a high-temperature and ultrahigh-pressure reheating-free system.
Fig. 7 is a schematic diagram of a connection relationship between a metal hanging plate and a metal hook of a superheater of a biomass layer combustion boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 8 is a front view of a surface contact type sealing device of a biomass layer combustion boiler with a high-temperature ultrahigh-pressure reheating-free system.
Fig. 9 is one of left side views of a surface contact type sealing device of a biomass layer combustion boiler of a high-temperature ultrahigh-pressure reheating-free system.
Fig. 10 is a second left side view of the surface contact sealing device of the biomass layer combustion boiler with the high-temperature ultrahigh-pressure reheating-free system.
Fig. 11 is a schematic diagram of a device for performing build-up welding, fusion and corrosion prevention on the water-cooled wall of the high-temperature ultrahigh-pressure reheating-system-free biomass layer combustion boiler aiming at a high-temperature region of a hearth.
Fig. 12 is a schematic diagram of a dual protection fire protection device of a biomass layer combustion boiler with a high temperature and ultra high pressure reheating-free system provided by the invention in an open state.
Fig. 13 is a schematic diagram of a dual protection fire protection device of a biomass layer combustion boiler with a high temperature and ultra high pressure reheating-free system in a closed state.
11-Fuel carrier, 111-left-side fuel carrier, 112-right-side fuel carrier, 113-support spring, 114-connector, 115-primary seal, 116-left-side secondary seal, 117-right-side secondary seal, 118-base;
12-vibration damping device, 1221-first connection, 1222-second connection, 1223-vibration damping spring steel plate;
13-a force bearing structure;
14-air supply devices, 141-air pipes, 142-air pipe branches, 143-air chambers, 145-air regulating doors and 146-air inlets;
The device comprises a first smoke channel, a second smoke channel, a third smoke channel, a fourth smoke channel, a fifth smoke channel and a corner ash deposition structure, wherein the first smoke channel, the second smoke channel, the third smoke channel, the fourth smoke channel, the fifth smoke channel and the corner ash deposition structure are respectively arranged at the corners of the smoke channel, the first smoke channel, the second smoke channel, the third smoke channel, the fourth smoke channel and the fourth smoke channel;
31-water cooling walls, 312-water tanks, 313-water pumps, 314-external pipelines, 3111-metal sheets and 3122-metal pipelines;
32-third-stage superheater, 33-fourth-stage superheater, 36-economizer, 37-first low-temperature economizer, 38-second low-temperature economizer, 39-external hydrothermal medium air preheater and 40-drum;
35-first-stage superheater, 34-second-stage superheater, 351-metal hanging plate, 352-metal hook, 354-water wall tube bundle;
41-plugboard door, 42-actuating mechanism, 43-pressure monitoring component, 44-temperature monitoring component, 45-blanking port and 46-feeding equipment.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the invention provides a biomass layer combustion boiler without a reheating system at high temperature and ultra high pressure, which is characterized by comprising an air distribution system, a flue gas system and a steam-water system; the air distribution system comprises a fuel bearing component 11, a vibration reduction device 12, a force bearing structure 13 and an air supply device 14 which are sequentially arranged from top to bottom; the flue gas system comprises a first flue gas channel 21, a second flue gas channel 22, a third flue gas channel 23, a fourth flue gas channel 24, a corner ash deposition structure 26 and a fifth flue gas channel 25 which are sequentially connected in a penetrating manner; the steam-water system comprises a water cooling wall 31, a first-stage superheater 35, a second-stage superheater 34, a third-stage superheater 32, a fourth-stage superheater 33, a boiler barrel 40, an economizer 36, a first low-temperature economizer 37, a second low-temperature economizer 38 and an external water heating medium air preheater 39; the fuel bearing component 11, the vibration reduction device 12 and the force bearing structure 13 are arranged in the first flue gas channel 21, and the third-stage superheater 32 is arranged above the fuel bearing component 11 and positioned in the first flue gas channel 21; the fourth stage superheater 33 is disposed within the second flue gas channel 22; the second stage superheater 34 and the first stage superheater 35 are disposed within the third flue gas channel 23; the economizer 36 is disposed within the fourth flue gas channel 24; a first low-temperature economizer 37 is arranged below the economizer 36 and in the fourth flue gas channel 24, and the second low-temperature economizer 38 is arranged in the fifth flue gas channel 25; The biomass fuel is combusted on the fuel bearing component 11 to generate high-temperature flue gas, the high-temperature flue gas flows upwards through the third-stage superheater 32, then flows downwards through the fourth-stage superheater 33, then flows upwards through the second-stage superheater 34 and the first-stage superheater 35, and releases heat to the water cooling walls 31 on the first flue gas channel 21, the second flue gas channel 22 and the third flue gas channel 23 in the flowing process of the high-temperature flue gas; the high-temperature flue gas continuously flows downwards through the economizer 36 and the first low-temperature economizer 37, then flows upwards through the second low-temperature economizer 38 through the corner ash deposition structure 26, and finally is discharged out of the biomass grate-fired boiler, so that heat carried by the high-temperature flue gas is transferred to steam-water working media in the steam-water system; And a part of the high-pressure feed water firstly enters the external water heating medium air preheater 39 to heat primary air and secondary air, the temperature of the high-pressure feed water is reduced, then the high-pressure feed water firstly sequentially enters the second low-temperature economizer 38 and the first low-temperature economizer 37 to absorb the heat of flue gas, and the temperature of the high-pressure feed water is increased and then enters the economizer 36; another portion of the high pressure feedwater directly enters the economizer 36; the two parts of high-pressure feed water are converged in the economizer 36 and then flow into the boiler drum 40; the steam separated by the drum 40 passes through the first stage superheater 35, the second stage superheater 34, the third stage superheater 32 and the fourth stage superheater 33 in sequence to form high-temperature and ultrahigh-pressure grade new steam; The water separated by the drum 40 enters the water cooling wall 31 through a pipe to absorb the heat of the flue gas in the first flue gas channel 21, the second flue gas channel 22 and the third flue gas channel 23 again, and the water flows back to the drum 40 for separation after forming a steam-water mixture.
Preferably, the new steam temperature is 540 ℃ and the pressure is 13.44MPa (g). The parameters of the new steam belong to the high temperature and ultra-high pressure grade specified in the national relevant standard specification.
Preferably, the new steam enters the steam turbine to apply work and drive the generator to generate electricity.
Preferably, as shown in fig. 2, the air supply device 14 includes an air duct 141, an air duct branch 142, and an air chamber 143; the air chamber 143 is arranged below the fuel carrying component 11; wherein the number of the air pipes 141 is only one, the number of the air pipe branches 142 is N, the number of the fuel bearing components 11 is N, and the number of the air chambers 143 is N multiplied by N, wherein N is more than or equal to 2; the air chambers 143 are vertically and horizontally arranged in a mode of N transverse air chambers and N longitudinal air chambers; the air duct 141 is communicated with the air chamber 143 through the air duct shunt 142; and the primary air for supporting combustion is branched from the air pipes 141 through the air pipes 141 respectively to enter the air chambers 143 below the fuel bearing members 11, and then passes through the fuel bearing members 11 to be mixed with the fuel above and then supported. Preferably, a damper 145 is provided in the air duct branch 142, an air inlet 146 is provided in the air chamber 143, and the air inlet 146 of the air chamber 143 below the air duct 141 is sized larger for the fuel carrying component 11 away from the air duct 141; for the fuel bearing component 11 near the air duct 141, the air inlet 146 of the air chamber 143 below it may be sized smaller to achieve uniformity of the air inlet below the fuel bearing component 11. Compared with the prior art, the air supply device of the biomass layer combustion boiler without the reheating system has the following beneficial effects: ① According to the air supply device for the biomass grate-fired boiler applied to the high-temperature ultrahigh-pressure reheating-free system, provided by the invention, the number of the air chambers below the fuel bearing part is greatly increased, and the air distribution adjustability of the fuel bearing part is improved. ② According to the air supply device for the biomass layer combustion boiler applied to the high-temperature ultrahigh-pressure reheating-free system, provided by the invention, the number of the air chambers corresponding to each fuel bearing part is increased, and each air chamber can independently supply air to the fuel bearing part, so that an operator can accurately adjust the air distribution condition of a small area on each fuel bearing part, and the full combustion of biomass fuels in different areas on the fuel bearing part is greatly facilitated. ③ Compared with the prior art, the air supply device for the biomass layer combustion boiler, which is applied to the high-temperature ultrahigh-pressure reheating-free system, disclosed by the invention, combines two paths of air supply pipelines into one path, so that the space occupied by the air supply pipelines on site is greatly reduced, and the air supply device has great practical application value. ④ The air supply device for the biomass grate-fired boiler applied to the high-temperature ultrahigh-pressure reheating-free system effectively solves the problem of uneven air distribution of fuel bearing parts with different distances from the air pipe by setting the size of the air inlet of the air chamber far away from the air supply pipe to be larger and the size of the air inlet of the air chamber close to the air supply pipe to be smaller in advance.
Preferably, as shown in fig. 1 and 3, the vibration damping device 12 is provided in an S-shape, including a first connecting portion 1221 concavely extending to the right and a second connecting portion 1222 concavely extending to the left, and a vibration damping spring steel plate 1223 is provided between the first connecting portion 1221 and the second connecting portion 1222; the damping device 12 is fixed to the fuel carrier 11 by the first connection 1221 and to the force-bearing structure 13 by the second connection 1222. Preferably, the number of the vibration damping devices 12 is plural, and the vibration damping spring steel plates 1223 are disposed in parallel between the fuel bearing member 11 and the force bearing structure 13, and are formed by stacking a plurality of thin steel plates. Compared with the prior art, the vibration damper 12 of the present invention has the following advantages: ① The installation positions of the vibration reduction devices are reasonably distributed, so that the vibration reduction load is distributed more uniformly. ② The number of vibration damping devices is appropriately increased, so that the vibration damping load borne by each vibration damping device is greatly reduced. ③ The S-shaped vibration damper is adopted, and the performance of absorbing vibration is greatly superior to that of the existing C-shaped vibration damper. ④ The adoption of the composite structure of stacking a plurality of thin steel plates reduces the overall rigidity of the whole spring steel plate, greatly increases the flexibility and greatly improves the performance of absorbing vibration.
Preferably, as shown in fig. 1 and fig. 4 to 7, the first stage superheater 35 and the second stage superheater 34 are fastened to the waterwall bundles 354 by metal hanging plates 351 and metal hooks 352 corresponding to the metal hanging plates 351; wherein the metal hanging plate 351 is arranged on the water wall pipe bundle 354 near the elbow of the first stage superheater 35 and the second stage superheater 34; the metal hooks 352 are provided on the bends of the first stage superheater 35 and the second stage superheater 34. Compared with the prior art, the invention has the following beneficial effects: ① The invention evenly distributes the weight of the horizontal superheater around the water-cooled wall, rather than being concentrated on a plurality of suspenders as in the prior art, and greatly improves the reliability and safety. ② Compared with the existing metal hook, the metal hook hardly occupies any additional smoke flowing space. ③ The hook and the hanging plate have very high fitting degree, and do not have the problems of shaking and vibration. ④ The invention does not increase the holes penetrating out of the furnace top, and only needs to improve the bearing capacity of the steel structure of the hanging water-cooled wall. Therefore, the invention effectively solves the problem that the boom is easy to fail and break due to the adoption of the metal boom to bear the weight of the horizontal superheater; the problem that the metal lifting hook occupies a large space in the flue gas channel and causes disturbance to the flue gas is solved; the problem that the metal suspender is easy to shake and vibrate is solved; the problem of need seal the position that the jib worn out the furnace roof is solved.
Preferably, as shown in fig. 8 to 10, the surface contact type sealing device further includes a surface contact type sealing device including a left side fuel bearing part 111, a right side fuel bearing part 112, a support spring 113, a connection 114, a main sealing part 115, a left side sub sealing part 116, a right side sub sealing part 117, and a base 118; wherein the left side fuel bearing part 111 and the right side fuel bearing part 112 are respectively arranged at equal heights, and are connected with the base 118 through the connecting piece 114; the supporting spring 113 is disposed between the left side fuel bearing member 111 and the right side fuel bearing member 112, one end of the supporting spring 113 is connected to the base 118, and the main seal member 115 is disposed on the other end of the supporting spring 113; The left side sub seal member 116 and the right side sub seal member 117 are respectively disposed opposite to the adjacent both side surfaces of the main seal member 115, and are simultaneously connected to the left side fuel carrying member 111 and the right side fuel carrying member 112, respectively. Preferably, the left side secondary seal member 116 is welded to the left side fuel carrying member 111 on the rim side; the right side secondary seal 117 is welded to the right side fuel carrying member 112 along the sides thereof. Preferably, the main sealing member 115, the left side auxiliary sealing member 116 and the right side auxiliary sealing member 117 are made of square steel, and the main sealing member 115 is disposed at an angle of forty-five degrees to the horizontal plane. In the state where both side fuel carrying members are stationary, as shown in fig. 9, the main seal member 115, the left side sub seal member 116, the right side sub seal member 117 and the left side fuel carrying member 111, the right side fuel carrying member 112 form good "face contact" sealing faces, are tightly screwed with each other, and the fuel cannot leak from the gap between the left side fuel carrying member 111, the right side fuel carrying member 112. As shown in fig. 10, when the left fuel carrying member 111 moves downward and the right fuel carrying member 112 is kept stationary, the left fuel carrying member 111 rotates by a certain angle (for example, 4 °), while the supporting spring 113 is slightly deformed by being pressed, but as can be seen from fig. 10, the main sealing member 115 and the left sub-sealing member 116, the right sub-sealing member 117 still fit very tightly, so that the gap between the sealing members is smaller than the size of the fuel, and the fuel still cannot leak down from the gap between the left fuel carrying member 111 and the right fuel carrying member 112. This is also the case when the right side fuel carrying member 112 moves while the left side fuel carrying member 111 remains stationary. Compared with the prior art, the invention has the following beneficial effects: ① The invention can effectively solve the problem of fuel leakage caused by unreasonable sealing structure design among fuel bearing parts of the biomass grate-fired boiler in the prior art. ② The invention solves the problems of waste of biomass fuel and low efficiency of the biomass grate-fired boiler caused by fuel leakage. ③ The invention solves the problem of safety accidents caused by fuel leakage in the combustion chamber.
Preferably, as shown in fig. 11, the device also comprises a device for performing surfacing welding and melting corrosion prevention on the water-cooled wall in the high-temperature area of the hearth, wherein the device comprises a water tank 312, a water pump 313 and an external pipeline 314; wherein, the water-cooled wall 31 is made by alternately welding metal sheets 3111 and metal pipes 3122; the metal pipe 3122 of the water-cooled wall 31 is connected to the water tank 312 and the water pump 313 through the external pipe 314; the surfacing welding and corrosion preventing treatment is carried out, meanwhile, water is introduced into the treatment area for cooling, the water after heat absorption is collected into the water tank 312, after the temperature is reduced, the water is pumped out by the water pump 313 and is pumped back into the metal pipeline 3122 of the water cooling wall 31 through the external pipeline 314, and heat absorption is repeated in a circulating manner. Preferably, the area range of the water-through cooling is enlarged to prevent the peripheral area of the treatment area from being damaged at high temperature due to good heat conduction characteristics of the metal. Preferably, the nickel-based alloy is adopted as the material for the surfacing and the melting layer has the thickness of 1.5-2 mm. Compared with the prior art, the invention has the following beneficial effects: ① The invention can realize corrosion prevention without changing water-cooled wall materials in a large amount. ② The invention effectively solves the problem that the water-cooled wall is damaged by high temperature damage during overlaying welding by introducing water and cooling. ③ The invention properly enlarges the area range of water supply and temperature reduction, and prevents the peripheral area of the treatment area from being damaged at high temperature due to good heat conduction property of metal. ④ According to the anti-corrosion device for surfacing and fusion coating of the water-cooled wall in the high-temperature area of the hearth, the nickel-based alloy is adopted as the surfacing and fusion coating material, and the anti-corrosion performance is better than that of the device which is obtained by replacing all water-cooled wall pipes with alloy steel 15 CrMoG. In summary, the device for performing surfacing and fusion corrosion prevention on the water-cooled wall in the high-temperature area of the hearth provided by the invention effectively solves the problem that the high-temperature area of the water-cooled wall is not corroded without expensive materials, solves the problem that the water-cooled wall is easily damaged at high temperature when the surfacing and fusion corrosion prevention is performed, greatly reduces the corrosion prevention cost of the high-temperature area of the water-cooled wall, and ensures that the corrosion prevention effect reaches the optimal degree by selecting proper surfacing and fusion materials and thickness of the surfacing fusion coating.
Preferably, as shown in fig. 12 and 13, a double protection fire protection device is also included, which includes a fork door 41, an actuator 42, a pressure monitoring component 43, and a temperature monitoring component 44; wherein, the flashboard door 41 is controlled by the actuating mechanism 42 and is used for opening or closing the blanking port 45; disposing the pressure monitoring part 43 in the biomass grate-fired boiler; providing the temperature monitoring means 44 on a feeding device 46 where fuel enters the inlet of the biomass grate-fired boiler; and simultaneously transmits the measured pressure signal and the measured temperature signal to the actuator 42 in real time as control signals for controlling the insert plate door 41. Preferably, when the positive pressure value in the biomass grate-fired boiler reaches a threshold value, the pressure value is detected by the pressure monitoring component 43, a pressure signal is transmitted to the actuating mechanism 42, and the actuating mechanism 42 drives the insert plate door 41 to close a part of the blanking port 45. Preferably, if the temperature monitoring unit 44 also detects that the temperature has reached the threshold value, the actuator 42 drives the gate 41 to completely close the blanking port 45 under the control of the temperature signal. Preferably, the number of the pressure monitoring components 43 is plural, the number of the temperature monitoring components 44 is plural, the actuator 42 is a pneumatic actuator, and the insert door 41 is a pneumatic insert door. Compared with the prior art, the invention has the following beneficial effects: ① The double-protection fireproof device applied to the biomass layer combustion boiler of the high-temperature ultrahigh-pressure reheating-free system provided by the invention is not used for passive fireproof any more, but can actively track the running condition of the boiler in real time, and actively take fireproof measures in advance according to abnormal conditions of the boiler. ② According to the invention, a part of blanking channels can be closed firstly according to the pressure signal, and whether the blanking channels are fully closed is determined according to the temperature signal so as to avoid frequent actions and misoperation. ③ The invention has the advantages of high speed of the executing mechanism and large driving force, and can quickly react according to the situation. In summary, the dual-protection fireproof device applied to the biomass grate-fired boiler with the high-temperature ultrahigh-pressure reheating-free system provided by the invention solves the problems that the existing fireproof device of the stokehole feeding system can only passively prevent fire and can not predict whether fire risks occur in advance, and solves the problem that the existing fireproof device of the stokehole feeding system can cause mechanical fireproof mechanism failure due to the fact that the blanking pipe is blocked by fuel.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, the description is relatively simple because of corresponding to the method disclosed in the embodiment, and the relevant points refer to the description of the method section.
Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (15)
1. The biomass layer combustion boiler without the reheating system at high temperature and ultra high pressure is characterized by comprising an air distribution system, a flue gas system and a steam-water system; wherein,
The air distribution system comprises a fuel bearing component, a vibration reduction device, a force bearing structure and an air supply device which are sequentially arranged from top to bottom;
The flue gas system comprises a first flue gas channel, a second flue gas channel, a third flue gas channel, a fourth flue gas channel, a corner ash deposition structure and a fifth flue gas channel which are sequentially connected in a penetrating manner;
the steam-water system comprises a water cooling wall, a first-stage superheater, a second-stage superheater, a third-stage superheater, a fourth-stage superheater, a boiler barrel, an economizer, a first low-temperature economizer, a second low-temperature economizer and an external water heating medium air preheater;
The third-stage superheater is arranged above the fuel bearing component and is positioned in the first flue gas channel; the fourth-stage superheater is arranged in the second flue gas channel; the second stage superheater and the first stage superheater are arranged in the third flue gas channel; the economizer is arranged in the fourth flue gas channel; the first low-temperature economizer is arranged below the economizer and in the fourth flue gas channel, and the second low-temperature economizer is arranged in the fifth flue gas channel;
The biomass fuel is combusted on the fuel bearing component to generate high-temperature flue gas, the high-temperature flue gas flows upwards through the third-stage superheater, flows downwards through the fourth-stage superheater, flows upwards through the second-stage superheater and the first-stage superheater, and releases heat to the water cooling walls on the first flue gas channel, the second flue gas channel and the third flue gas channel in the flowing process of the high-temperature flue gas; the high-temperature flue gas continuously flows downwards through the economizer and the first low-temperature economizer, then flows upwards through the second low-temperature economizer through the corner ash deposition structure, and finally is discharged out of the biomass grate-fired boiler, so that heat carried by the high-temperature flue gas is transferred to steam-water working media in the steam-water system; and
A part of high-pressure water supply firstly enters the external water heating medium air preheater to heat primary air and secondary air required by fuel combustion, the temperature of the high-pressure water supply is reduced, then the high-pressure water supply firstly sequentially enters the second low-temperature economizer and the first low-temperature economizer to absorb the heat of flue gas, and the temperature of the high-pressure water supply is increased and then enters the economizer; the other part of high-pressure water supply directly enters the economizer; the two parts of high-pressure water supply flow into the boiler barrel after being converged in the economizer; the steam separated from the boiler barrel sequentially passes through the first-stage superheater, the second-stage superheater, the third-stage superheater and the fourth-stage superheater to form high-temperature and ultrahigh-pressure-level new steam; the water supply separated by the boiler barrel enters the water cooling wall through a pipe to absorb the heat of the smoke in the first smoke channel, the second smoke channel and the third smoke channel again, and the water flows back to the boiler barrel for separation after forming a steam-water mixture;
The fuel bearing component is fastened to the force bearing structure by the vibration damping device;
the vibration reduction device is arranged in an S shape and comprises a first connecting part concavely extending rightward and a second connecting part concavely extending leftward, and a vibration reduction spring steel plate is arranged between the first connecting part and the second connecting part; the vibration damping device is fixed with the fuel bearing component through the first connecting part and is fixed with the force bearing structure through the second connecting part;
The surface contact type sealing device comprises a left side fuel bearing component, a right side fuel bearing component, a supporting spring, a connecting piece, a main sealing component, a left side auxiliary sealing component, a right side auxiliary sealing component and a base; wherein,
The left fuel bearing component and the right fuel bearing component are respectively arranged at equal heights and are connected with the base through the connecting piece;
the support spring is arranged between the left fuel bearing component and the right fuel bearing component, one end of the support spring is connected with the base, and the main sealing component is arranged at the other end of the support spring;
The left side auxiliary sealing component and the right side auxiliary sealing component are respectively and oppositely arranged on two adjacent side surfaces of the main sealing component and are respectively connected with the left side fuel bearing component and the right side fuel bearing component at the same time.
2. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 1, wherein said fresh steam temperature is 540 ℃, and the pressure is 13.44MPa (g).
3. The biomass grate-fired boiler of claim 1, wherein the new steam enters a steam turbine to apply work and drive a generator to generate electricity.
4. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 1, wherein said air supply means includes an air duct, an air duct shunt, and an air plenum; the air chamber is arranged below the fuel bearing component; wherein,
The number of the air pipes is only one, the number of the air pipe branches is N, the number of the fuel bearing components is N, the number of the air chambers is N multiplied by N, and N is more than or equal to 2;
The air chambers are vertically and horizontally arranged in a mode of N air chambers in the transverse direction and N air chambers in the longitudinal direction;
the air pipe is communicated with the air chamber through the air pipe shunt; and
The primary air for supporting combustion is respectively shunted into the air chamber below the fuel bearing component from the air pipe through the air pipe, then passes through the fuel bearing component and is mixed with the fuel above, and then supporting combustion.
5. The biomass grate-fired boiler of claim 1, wherein the number of vibration damping devices is plural, the vibration damping devices are arranged in parallel between the fuel bearing component and the force bearing structure, and the vibration damping spring steel plates are of a multi-sheet steel plate stacked composite structure.
6. The biomass grate-fired boiler of claim 1, wherein the first stage superheater and the second stage superheater are fastened to the water wall tube bundle by metal hanging plates and metal hook buckles matched with the metal hanging plates; wherein,
The metal hanging plate is arranged on the water wall tube bundles near the elbows of the first-stage superheater and the second-stage superheater;
And the metal hooks are arranged on the elbows of the first-stage superheater and the second-stage superheater.
7. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 1, wherein said left side secondary seal member is welded to said left side fuel bearing member rim side; the right side secondary seal is welded to the right side fuel carrying member rim side.
8. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 7, wherein said primary seal member, said left side secondary seal member and said right side secondary seal member are each comprised of square steel, said primary seal member being disposed at a forty-five degree angle to horizontal.
9. The biomass grate-fired boiler of a high-temperature ultrahigh-pressure reheating-free system according to claim 1, further comprising a build-up welding and fusion corrosion prevention device aiming at the water-cooled wall of a high-temperature area of a hearth, wherein the device comprises a water tank, a water pump and an external pipeline; wherein,
The water cooling wall is manufactured by alternately welding metal sheets and metal pipelines at intervals;
the metal pipeline of the water cooling wall is connected with the water tank and the water pump through the external pipeline;
and (3) carrying out build-up welding, fusion and corrosion prevention treatment, simultaneously carrying out water cooling on a treatment area, collecting the absorbed water into the water tank, pumping the cooled water into a metal pipeline of the water cooling wall through the external pipeline after cooling, and repeating cyclic heat absorption.
10. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 9, wherein the area of water passing and cooling is enlarged to prevent high temperature damage to the peripheral area of the treatment area due to good heat transfer characteristics of the metal.
11. The biomass grate-fired boiler with the high-temperature ultrahigh-pressure reheating-free system according to claim 9, wherein the nickel-based alloy is adopted as a material for the surfacing and the thickness of the surfacing and the thawing layer is 1.5-2 mm.
12. The biomass grate-fired boiler of claim 1, further comprising a double protection fire protection device, and comprising a plugboard door, an actuator, a pressure monitoring component and a temperature monitoring component; wherein,
The plugboard door is controlled by the actuating mechanism and is used for opening or closing the blanking pipe;
Arranging the pressure monitoring component in the biomass grate-fired boiler;
The temperature monitoring component is arranged on feeding equipment at the inlet of the biomass grate-fired boiler where fuel enters;
And simultaneously transmitting the measured pressure signal and the measured temperature signal to the actuating mechanism in real time to be used as a control signal for controlling the plugboard door.
13. The high temperature, ultra-high pressure, reheat system free biomass grate firing boiler of claim 12, wherein when a positive pressure value occurring within the biomass grate firing boiler reaches a threshold value, the pressure value is measured by the pressure monitoring component, a pressure signal is transmitted to the actuator, and the actuator drives the insert plate door to close a blanking port first.
14. The biomass grate-fired boiler of claim 12, wherein if the temperature monitoring component also detects that the temperature has reached a threshold, the actuator, in turn, under control of a temperature signal, drives the fork gate to fully close the down pipe.
15. The high temperature, ultra-high pressure reheat system free biomass grate firing boiler of claim 12, wherein the number of pressure monitoring components is plural, the number of temperature monitoring components is plural, the actuator is a pneumatic actuator, and the grate door is a pneumatic grate door.
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