CN112413571A - Comprehensive utilization system of natural gas boiler and operation method thereof - Google Patents
Comprehensive utilization system of natural gas boiler and operation method thereof Download PDFInfo
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- CN112413571A CN112413571A CN202011308914.6A CN202011308914A CN112413571A CN 112413571 A CN112413571 A CN 112413571A CN 202011308914 A CN202011308914 A CN 202011308914A CN 112413571 A CN112413571 A CN 112413571A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- 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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
- F23J13/08—Doors or covers specially adapted for smoke-boxes, flues, or chimneys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention discloses a natural gas boiler comprehensive utilization system and an operation method thereof.A gas burner is arranged at an inlet of a natural gas boiler, an economizer, a water removal device and a flue isolation door are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler, and the flue gas outlet pipeline is communicated with a chimney; the deaerator is connected with the energy saver, and a water outlet pipe of the energy saver is connected with the natural gas boiler; one end of the flue is communicated with the flue gas outlet pipeline, and the communication point is positioned between the water removal device and the flue isolation door; one end of the flue is divided into two paths and is respectively connected with CO2Storage tank and CO2And O2The mixing box is connected, and the air feeder is arranged on the flue; CO 22And O2The mixing box is connected with O2Pipeline, CO2And O2Mixing box passing CO2And O2The pipeline is connected with the gas burner, and the gas burner is also connected with a natural gas pipeline. The invention has the characteristics of simple system, extremely low discharge amount, small investment and comprehensive utilization of products generated by combustion, and provides an idea for the environmental protection, high efficiency and comprehensive utilization development of industrial boilers in the future.
Description
Technical Field
The invention belongs to the field of industrial boilers, and relates to a comprehensive utilization system of a natural gas boiler and an operation method thereof.
Background
NOx is an important pollution factor influencing the quality of atmospheric environment, and the harm of NOx, the generation mechanism of NOx in the combustion process of coal-fired power generation, the reduction of NOx technology and the like are fully researched at home and abroad. The reaction of nitrogen oxide gas can form ozone, which is the main component of flue gas and acid rain, and also the main component of fine particles, and is harmful to human health. In China, strict emission standards of boiler atmospheric pollutants are released successively for natural gas boilers. The existing gas boiler executes national standard of 150mg/m3The most strict discharge standard of gas-fired boilers is required to be established in the areas where the air quality is urgently required to be improved, and the NOx emission concentration is not higher than 30mg/m3However, too low NOx emissions can lead to unstable boiler combustion and reduced thermal efficiency. From the current combustion of air and natural gas, the NOx emission concentration uses the prior art, and the limit emission amount is 20mg/m3The following has been difficult to achieve.
CO2The generation is mainly greenhouse effect, and the atmospheric greenhouse effect refers to the warming effect of atmospheric substances on the near-earth gas layer along with CO in the atmosphere2Constant temperature increasing substanceThe increase of the quality can block the expenditure of long-wave radiation energy from the ground and near-ground air layers to the universe space more, thereby warming the earth climate, frequently generating drought and waterlogging disasters of tropical and temperate zones, melting the iceberg, rising the sea level and submerging the coastal delta. Thus, CO reduction2The discharge amount of (A) is an obligation that people have no patience. At present, CO2The emission reduction is mainly realized by separating from air, and the technology has high cost and low popularization and application prospect.
Because the natural gas boiler can generate a large amount of NOx and CO in the operation process2Thus how to reduce NOx and CO generation by natural gas boilers2The discharge amount of (a) is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a comprehensive utilization system of a natural gas boiler and an operation method thereof, and the comprehensive utilization system can greatly reduce the NOx and CO of the natural gas boiler2The system has the characteristics of simple structure, extremely low emission and comprehensive utilization of products generated by combustion, and provides an idea for the development of industrial boilers in the future.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a comprehensive utilization system of a natural gas boiler comprises a gas burner, the natural gas boiler, an energy saver, a water removal device, a flue isolation door, a chimney, a flue, a deaerator, a blower, and CO2Storage tank and CO2And O2The gas burner is arranged at the inlet of the natural gas boiler, the energy saver, the water removal device and the flue isolation door are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler, and the flue gas outlet pipeline of the natural gas boiler is communicated with the chimney; the deaerator is connected with the energy saver, and a water outlet pipe of the energy saver is connected with the natural gas boiler; one end of the flue is communicated with a flue gas outlet pipeline of the natural gas boiler, and the communication point is positioned between the water removal device and the flue isolation door; one end of the flue is divided into two paths and is respectively connected with CO2Storage tank and CO2And O2The mixing box is connected, and the air feeder is arranged on the flue；CO2And O2The mixing box is connected with O2Pipeline, CO2And O2Mixing box passing CO2And O2The pipeline is connected with the gas burner, and the gas burner is also connected with a natural gas pipeline.
Preferably, the energy saver comprises a primary energy saver and a secondary energy saver, and the primary energy saver and the secondary energy saver are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler; a water feeding pipe of the boiler is connected with an inlet of a deaerator through an outlet of the secondary economizer, an outlet of the deaerator is connected with an inlet of the primary economizer, and an outlet of the primary economizer is communicated with an inlet of the boiler.
Preferably, the dewatering device comprises a condensation drainage device and a water collecting device, and the condensation drainage device and the water collecting device are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler.
Preferably, CO2The pipeline for communicating the storage tank with the flue is provided with CO2Regulating valve and CO2The valve is closed.
Preferably, O2The pipeline is provided with an O2Regulating gate and O2The gate is turned off.
Preferably, CO2And O2The pipeline is provided with a combustor inlet air door.
Preferably, the flue is also provided with CO2Collection port, CO2The collection port is located downwind of the blower.
The working method of the comprehensive utilization system of the natural gas boiler comprises the following steps:
when the natural gas boiler needs to be started, CO is passed2Storage tank and O2The pipelines respectively flow to CO2And O2Introducing CO into the mixing box2And O2To make CO2And O2Mixing the mixture in the mixing box to ensure that O is fully mixed2Reaching the preset concentration; CO 22And O2CO in the mixing tank2And O2The mixed gas is mixed and combusted with natural gas in a natural gas boiler through a gas burner, high-temperature smoke formed by combustion is used for heating working medium on the heating surface in the natural gas boiler, and the heated high-temperature high-pressure working medium is used for generating electricity or supplying gas to the outside(ii) a The low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler firstly passes through the energy saver, the deoxygenated water at the outlet of the heating deoxygenator and the non-deoxygenated water at the inlet of the deoxygenator, and the heated deoxygenated water enters the natural gas boiler to be used as a working medium for absorbing heat; the ultralow temperature flue gas passing through the energy saver has the temperature lower than the water dew point, and is discharged and absorbed by the water removing device to obtain CO2Obtaining CO2Feeding CO through flue and blower2And O2The mixing box is recycled;
when the natural gas boiler is started, the flue gas containing CO gas generated by incomplete combustion in the starting stage passes through a flue isolation door and a chimney and is discharged;
when CO is present2CO supplied from storage tank2After the amount is ensured to be required by one circulation, CO generated by the gas boiler2Can meet the requirement of internal recycle and CO2The storage tank stops providing CO2And closing the flue isolation door.
Preferably, the energy saver comprises a primary energy saver and a secondary energy saver, and the primary energy saver and the secondary energy saver are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler; a water supply pipe of the boiler is connected with an inlet of a deaerator through an outlet of the secondary economizer, an outlet of the deaerator is connected with an inlet of the primary economizer, and an outlet of the primary economizer is communicated with an inlet of the boiler;
the low-temperature flue gas through the heat exchange of the natural gas boiler furnace firstly passes through an energy saver, the deaerated water at the outlet of the heating deaerator and the non-deaerated water at the inlet of the deaerator:
the low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler firstly passes through the first-stage energy saver to heat deoxygenated water at the outlet of the deoxygenator, and the heated deoxygenated water enters the boiler to be used as a working medium to absorb heat; the non-deoxygenated water at the inlet of the deaerator is heated by the second-stage economizer, the water temperature entering the deaerator is increased, and the temperature of the ultra-low temperature flue gas passing through the second-stage economizer is lower than the dew point of the water.
Preferably, the flue is also provided with CO2Collection port, CO2The collection port is positioned in the downwind direction of the air feeder, CO2The collecting port is connected with CO2A collection device;
when CO is generated by gas boiler2Can meet the requirement that redundant flue gas in the flue passes through CO after internal recycle2The collection port is used for recycling and storing or is buried after being discharged.
The invention has the following beneficial effects:
in the comprehensive utilization system of the natural gas boiler, the flue and the CO are arranged2Storage tank and CO2And O2One end of the flue of the mixing box is divided into two paths which are respectively connected with CO2Storage tank and CO2And O2The mixing box is connected so that when the gas boiler needs to be started, CO is introduced2And O2The formed mixed gas is mixed with natural gas in a natural gas boiler through a gas burner and is combusted in the natural gas boiler, the natural gas can be combusted in the natural gas boiler, heat generated by combustion is used for heating working media on the heating surface in the natural gas boiler, and the heated high-temperature high-pressure working media are used for generating electricity or supplying gas to the outside. No N is introduced in the process2The production and emission of NOx are avoided. Can reduce the flue gas temperature through setting up the energy-saving appliance for the flue gas temperature reduces to below the water dew point, and the discharge of the water that the burning of being convenient for produced like this prevents that aqueous vapor from mixing subsequent CO2In the recycling process; the deaerator is connected with the energy saver, energy in heat exchange of the energy saver can be used for heating deaerated water at an outlet of the deaerator, heated deaerated water enters the boiler to absorb heat as a working medium, non-deaerated water at an inlet of the deaerator can be heated, water temperature entering the deaerator is improved, and air consumption of the deaerator is reduced. When the natural gas boiler is started, the flue gas containing CO gas generated by incomplete combustion can be used for recycling the flue gas in the later period in the starting stage, so that the flue isolation door is arranged on the flue gas outlet pipeline of the natural gas boiler, the flue gas outlet pipeline of the natural gas boiler is communicated with the chimney, when the natural gas boiler is started, the flue gas containing CO gas can be discharged through the flue isolation door, and after the flue gas containing CO gas is completely discharged, the flue isolation door is closed, so that the flue gas is circulated in the system. From the above, the comprehensive utilization system of the natural gas boiler can greatly reduce the number of pairs of the natural gas boilerNOx and CO2The system has the characteristics of simple structure, extremely low emission and comprehensive utilization of products generated by combustion, and provides an idea for the development of industrial boilers in the future.
In the working method of the comprehensive utilization system of the natural gas boiler, only a small amount of boiler flue gas needs to be discharged, and the rest most of tail gas is used for circulation or can be utilized after being recycled in the system, so that the generation of NOx is avoided, and the CO is greatly reduced2The discharge amount is changed into valuable, the comprehensive utilization of products generated by combustion is realized, and the economic benefit of good environmental protection benefit is realized.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a natural gas pipeline, 2 is a natural gas regulating gate, 3 is a combustor inlet air door, 4 is a gas combustor, 5 is a natural gas boiler, 6 is a primary energy saver, 7 is a secondary energy saver, 8 is a condensation drainage device, 9 is a water receiving device, 10 is a flue isolation gate, 11 is a chimney, 12 is a flue, 13 is a deaerator inlet regulating gate, 14 is a deaerator, 15 is a blower, 16 is CO2Storage tank, 17 is CO2Regulating gate, 18 being CO2A shutoff gate, 19 being O2An adjusting gate, 20 is O2Shut-off gate, 21 being CO2And O2A mixing box, 22 is an oxygen pipeline, 23 is CO2And O2The pipeline 24 is CO2The collecting port 25 is a natural gas shutoff valve.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
referring to fig. 1, the comprehensive utilization system of the natural gas boiler comprises a gas burner 4, a natural gas boiler 5, an economizer, a water removal device, a flue isolation door 10, a chimney 11, a flue 12, a deaerator 14, a blower 15, CO2Storage tank 16 and CO2And O2A mixing box 21, a gas burner 4 arranged at the inlet of the natural gas boiler 5, an energy saver, a water removing device and a flue isolation door 10 arranged on the flue gas outlet pipeline of the natural gas boiler 5 in sequence, the natural gas boiler 5The flue gas outlet pipeline is communicated with the chimney 11; the deaerator 14 is connected with the energy saver, and a water outlet pipe of the energy saver is connected with the natural gas boiler 5; one end of the flue 12 is communicated with a flue gas outlet pipeline of the natural gas boiler 5, and the communication point is positioned between the water removal device and the flue isolation door 10; one end of the flue 12 is divided into two paths and is respectively connected with CO2Storage tank 16 and CO2And O2The mixing box 21 is connected, and the blower 15 is arranged on the flue 12; CO 22And O2O is connected to the mixing box 212 Pipe 22, CO2And O2Mixing tank 21 passing CO2And O2The pipeline 23 is connected with the gas burner 4, and the gas burner 4 is also connected with a natural gas pipeline.
As a preferred embodiment of the present invention, the economizer includes a primary economizer 6 and a secondary economizer 7, the primary economizer 6 and the secondary economizer 7 being sequentially disposed on a flue gas outlet pipe of the natural gas boiler 5; a water feeding pipe of the boiler is connected with an inlet of a deaerator 14 through an outlet of a secondary energy saver 7, an outlet of the deaerator 14 is connected with an inlet of a primary energy saver 6, and an outlet of the primary energy saver 6 is communicated with an inlet 5 of the boiler.
As a preferred embodiment of the present invention, the water removing device comprises a condensation water discharging device 8 and a water collecting device 9, and the condensation water discharging device 8 and the water collecting device 9 are sequentially arranged on the flue gas outlet pipeline of the natural gas boiler 5.
As a preferred embodiment of the present invention, CO2The pipeline of the storage tank 16 communicated with the flue 12 is provided with CO2Regulating valve 17 and CO2The valve 18 is closed.
As a preferred embodiment of the present invention, O2The pipeline 22 is provided with an O2Adjustment gates 19 and O2Gate 20 is turned off.
As a preferred embodiment of the present invention, CO2And O2The duct 23 is provided with a burner inlet damper 3.
As a preferred embodiment of the invention, the flue 12 is also provided with CO2Collection port, CO2The collection port 24 is located downstream of the blower 15.
The working method of the comprehensive utilization system of the natural gas boiler comprises the following steps:
when the natural gas boiler 5 needs to be started, CO is passed2 Storage tank 16 and O2The pipes 22 are respectively directed to CO2And O2Introducing CO into the mixing box 212And O2To make CO2And O2The mixing box 21 is fully mixed and leads to O2Reaching the preset concentration; CO 22And O2CO in the mixing tank 212And O2The mixed gas is mixed and combusted with natural gas in a natural gas boiler 5 through a gas burner 4, high-temperature flue gas formed by combustion is used for heating working media on the heating surface in the natural gas boiler 5, and the heated high-temperature high-pressure working media are used for generating electricity or supplying gas to the outside; the low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler 5 firstly passes through the energy saver, the deoxygenated water at the outlet of the heating deoxygenator 14 and the non-deoxygenated water at the inlet of the deoxygenator 14, and the heated deoxygenated water enters the natural gas boiler 5 to be used as a working medium for absorbing heat; the ultralow temperature flue gas passing through the energy saver has the temperature lower than the water dew point, and is discharged and absorbed by the water removing device to obtain CO2Obtaining CO2CO is fed via a flue 12 and a blower 152And O2A mixing box 21 for recycling;
when the natural gas boiler 5 is started, the flue gas containing CO gas generated due to incomplete combustion in the starting stage is discharged through the flue isolation door 10 and the chimney 11, and the flue gas is discharged into the atmosphere through the chimney 11 because the amount of the flue gas is small;
when CO is present2CO from tank 162CO produced by the gas boiler 5 after the amount is guaranteed to be the amount required by one cycle2Can meet the requirement of internal recycle and CO2The storage tank 16 stops supplying CO2The flue isolation door 10 is closed.
As a preferred embodiment of the present invention, the economizer includes a primary economizer 6 and a secondary economizer 7, the primary economizer 6 and the secondary economizer 7 being sequentially disposed on a flue gas outlet pipe of the natural gas boiler 5; a water feeding pipe of the boiler is connected with an inlet of a deaerator 14 through an outlet of a secondary energy saver 7, an outlet of the deaerator 14 is connected with an inlet of a primary energy saver 6, and an outlet of the primary energy saver 6 is communicated with an inlet 5 of the boiler;
when the low-temperature flue gas after the heat exchange of the 5 hearths of the natural gas boiler firstly passes through the energy saver, the deoxygenated water at the outlet of the heating deoxygenator 14 and the non-deoxygenated water at the inlet of the deoxygenator 14:
the low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler 5 firstly passes through the first-stage energy saver 6 to heat the deoxygenated water at the outlet of the deoxygenator 14, and the heated deoxygenated water enters the boiler to be used as a working medium to absorb heat; then the water passes through the second-stage energy saver 7, the non-deoxygenated water at the inlet of the deaerator 14 is heated, the water temperature entering the deaerator 14 is increased, and the temperature of the ultra-low temperature flue gas passing through the second-stage energy saver 7 is lower than the dew point of the water.
As a preferred embodiment of the invention, the flue 12 is also provided with CO2Collection port, CO2The collection port is located downwind of the blower 15, CO2The collecting port is connected with CO2A collection device;
when CO is generated from the gas boiler 52Can meet the requirement that after the internal recycle is used, the redundant flue gas in the flue 12 passes through CO2The collection port 24 is recovered for storage or is discharged for burial.
As shown in fig. 1, the natural gas boiler comprehensive utilization system of the embodiment includes 4 a gas burner, a natural gas boiler 5, a primary economizer 6, a secondary economizer 7, a condensation and drainage device 8, a water receiving device 9, a deaerator 14, a blower 15, and CO2Storage tank 16 and CO2And O2A mixing box 21. The natural gas boiler 5 is characterized in that a first-stage energy saver 6, a second-stage energy saver 7, a condensation drainage device 8, a water receiving device 9 and a flue isolation door 10 are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler 5 along the flue gas flowing direction, the tail end of the flue gas outlet pipeline of the natural gas boiler 5 is communicated with a chimney 11, the flue gas outlet pipeline of the natural gas boiler 5 is communicated with an inlet of a flue 12 between the water receiving device 9 and the flue isolation door 10, an outlet of the flue 12 is divided into two paths, and the two paths are respectively communicated with CO2Outlet of the storage tank 16 and CO2And O2The inlet of the mixing box 21 is communicated, the blower 15 is arranged at the flue 12, and the flue 12 is provided with CO at the downwind direction of the blower 152A collection port 24. CO 22And O2The outlet of the mixing box 21 communicates with the burner inlet damper 3. The boiler water supply pipeline passes through the outlet and the remover of the secondary energy saver 7The inlet of the oxygen device 14 is communicated, the outlet of the oxygen remover 14 is connected with the inlet of the primary energy saver 6, and the outlet of the primary energy saver 6 is communicated with the heat exchange medium inlet of the natural gas boiler 5. O is2The outlet of the conduit 22 is through O2Regulating valve 19, O2Shut-off valve 20 and CO2And O2The inlets of the mixing boxes 21 are communicated with CO2The outlet of the storage tank 16 is through CO2Regulating valve 17, CO2Shut-off valve 18 and CO2And O2The inlets of the mixing tanks 21 communicate. CO 22And O2The outlet of the mixing box 21 is communicated with the inlet of the hearth of the natural gas boiler 5 through the inlet of the burner inlet damper 13. The natural gas pipeline 1 is connected with a natural gas inlet of the gas burner 4 through a natural gas adjusting door 2 and a natural gas shutoff door 25.
The operation method of the comprehensive utilization system of the natural gas boiler in the embodiment of the invention comprises the following processes:
when the gas boiler needs to be started, the CO is turned on2 Storage tank 16, CO2By CO2Regulating valve 17 and CO2Shut-off valve 18 into CO2And O2In the mixing box 21, through O2Regulating valves 19 and O2Closing valve 12, O in oxygen line 222Into CO2And O2In the mixing tank 21, in CO2And O2In the mixing box 21, CO2And O2After thorough mixing, in the mixed gas, O should be ensured2Around 19%. CO 22And O2The mixed gas is mixed and combusted with natural gas (above 30 KPa) in a natural gas boiler 5 through a gas burner 4, the formed high-temperature flue gas (1500 ℃) is used for heating working medium on the heating surface in the boiler, and the heated high-temperature high-pressure working medium is used for generating electricity or supplying gas to the outside. The low-temperature flue gas (about 150 ℃) subjected to heat exchange in the hearth firstly passes through the first-stage energy saver 6 (made of carbon steel), can heat the deoxygenated water (100 ℃) at the outlet of the deoxygenator 14, and enters the natural gas boiler 5 to be used as a working medium for absorbing heat; after passing through the first-stage energy saver 6, the flue gas passes through the second-stage energy saver 7 (made of stainless steel), the non-deoxidized water (20 ℃) at the inlet of the deaerator 14 is heated, the water temperature of the non-deoxidized water entering the deaerator 14 is increased, and the gas consumption of the deaerator 14 is reduced. Through a second stageThe ultralow temperature flue gas (40-50 ℃) of the energy saver 7 is lower than the dew point of water, most of water in the flue gas is condensed and recovered through the condensation drainage device 8, the flue gas is removed with water in the flue gas through the water collecting device 9, and the component of the residual flue gas is CO2，CO2As non-combustible gas, through the flue 12 and the blower 15 into the CO2And O2Mixing box 21 with O2And the mixture enters a hearth to participate in circulation after being mixed. Excess CO of flue 122Can pass through CO directly2The collection port 24 is discharged for storage, sale or burial.
Claims (10)
1. The comprehensive utilization system of the natural gas boiler is characterized by comprising a gas burner (4), the natural gas boiler (5), an energy saver, a water removal device, a flue isolation door (10), a chimney (11), a flue (12), a deaerator (14), a blower (15), CO2A storage tank (16) and CO2And O2The gas-fired boiler comprises a mixing box (21), a gas burner (4) is arranged at the inlet of a natural gas boiler (5), an energy saver, a water removal device and a flue isolation door (10) are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler (5), and the flue gas outlet pipeline of the natural gas boiler (5) is communicated with a chimney (11); the deaerator (14) is connected with the energy saver, and a water outlet pipe of the energy saver is connected with the natural gas boiler (5); one end of the flue (12) is communicated with a flue gas outlet pipeline of the natural gas boiler (5), and the communication point is positioned between the water removal device and the flue isolation door (10); one end of the flue (12) is divided into two paths and is respectively connected with CO2A storage tank (16) and CO2And O2The mixing box (21) is connected, and the blower (15) is arranged on the flue (12); CO 22And O2O is connected to the mixing box (21)2Pipeline (22), CO2And O2The mixing box (21) is filled with CO2And O2The pipeline (23) is connected with the gas burner (4), and the gas burner (4) is also connected with a natural gas pipeline.
2. The natural gas boiler comprehensive utilization system as claimed in claim 1, wherein the economizer comprises a primary economizer (6) and a secondary economizer (7), the primary economizer (6) and the secondary economizer (7) are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler (5); a water feeding pipe of the boiler is connected with an inlet of a deaerator (14) through an outlet of a secondary energy saver (7), an outlet of the deaerator (14) is connected with an inlet of a primary energy saver (6), and an outlet of the primary energy saver (6) is communicated with an inlet (5) of the boiler.
3. The natural gas boiler comprehensive utilization system as claimed in claim 1, wherein the water removal device comprises a condensation drainage device (8) and a water collection device (9), and the condensation drainage device (8) and the water collection device (9) are sequentially arranged on a flue gas outlet pipeline of the natural gas boiler (5).
4. The comprehensive utilization system of a natural gas boiler according to claim 1, wherein CO is2CO is arranged on the pipeline of the storage tank (16) communicated with the flue (12)2Regulating valve (17) and CO2A shut-off valve (18).
5. The comprehensive utilization system of a natural gas boiler according to claim 1, wherein O is2The pipeline (22) is provided with O2Adjustment gates (19) and O2The gate (20) is turned off.
6. The comprehensive utilization system of a natural gas boiler according to claim 1, wherein CO is2And O2The pipeline (23) is provided with a combustor inlet air door (3).
7. The comprehensive utilization system of a natural gas boiler according to claim 1, characterized in that the flue (12) is further provided with CO2Collection port, CO2The collection port (24) is located downstream of the blower (15).
8. The method for operating the comprehensive utilization system of the natural gas boiler of any one of claims 1 to 7, characterized by comprising the following processes:
when the natural gas boiler (5) needs to be started, CO is passed2Storage tank (16) and O2The pipes (22) are respectively directed to CO2And O2CO is introduced into the mixing box (21)2And O2To make CO2And O2The mixing box (21) is fully mixed and leads to O2Reaching the preset concentration; CO 22And O2CO in the mixing tank (21)2And O2The mixed gas is mixed and combusted with natural gas in a natural gas boiler (5) through a gas burner (4), high-temperature flue gas formed by combustion is used for heating working medium on the heating surface in the natural gas boiler (5), and the heated high-temperature high-pressure working medium is used for generating electricity or supplying gas to the outside; the low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler (5) firstly passes through an energy saver, deoxygenated water at the outlet of a heating deoxygenator (14) and non-deoxygenated water at the inlet of the deoxygenator (14), and the heated deoxygenated water enters the natural gas boiler (5) to be used as a working medium for absorbing heat; the ultralow temperature flue gas passing through the energy saver has the temperature lower than the water dew point, and is discharged and absorbed by the water removing device to obtain CO2Obtaining CO2CO is fed in through a flue (12) and a blower (15)2And O2A mixing box (21) for recycling;
when the natural gas boiler (5) is started, the flue gas containing CO gas generated by incomplete combustion in the starting stage passes through a flue isolation door (10) and a chimney (11) and is discharged;
when CO is present2CO from a storage tank (16)2The amount of CO generated by the gas boiler (5) after ensuring the amount required by one cycle2Can meet the requirement of internal recycle and CO2The storage tank (16) stops supplying CO2And closing the flue isolation door (10).
9. The working method according to claim 8, characterized in that the economizer comprises a primary economizer (6) and a secondary economizer (7), the primary economizer (6) and the secondary economizer (7) being arranged in sequence on a flue gas outlet duct of the natural gas boiler (5); a water feeding pipe of the boiler is connected with an inlet of a deaerator (14) through an outlet of a secondary energy saver (7), an outlet of the deaerator (14) is connected with an inlet of a primary energy saver (6), and an outlet of the primary energy saver (6) is communicated with an inlet (5) of the boiler;
when the low-temperature flue gas subjected to heat exchange in the hearth of the natural gas boiler (5) firstly passes through the energy saver, the deaerated water at the outlet of the heating deaerator (14) and the non-deaerated water at the inlet of the deaerator (14):
the low-temperature flue gas subjected to heat exchange in a hearth of the natural gas boiler (5) firstly passes through the first-stage energy saver (6) to heat deoxygenated water at the outlet of the deoxygenator (14), and the heated deoxygenated water enters the boiler to be used as a working medium to absorb heat; then the water passes through the second-stage energy saver (7), the non-deoxygenated water at the inlet of the deaerator (14) is heated, the water temperature entering the deaerator (14) is increased, and the temperature of the ultra-low temperature flue gas passing through the second-stage energy saver (7) is lower than the water dew point.
10. Working method according to claim 8, characterized in that the flue (12) is also provided with CO2Collection port, CO2The collection port is positioned in the downwind direction of the blower (15), CO2The collecting port is connected with CO2A collection device;
when CO is generated by the gas boiler (5)2Can meet the requirement that redundant flue gas in the flue (12) passes through CO after internal recycle2The collection port (24) is recovered for storage or is buried after being discharged.
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| CN114216135A (en) * | 2021-12-01 | 2022-03-22 | 北京科技大学 | Based on CO2Circulating natural gas pure oxygen combustion zero-emission combustion system |
| WO2023024546A1 (en) * | 2021-08-25 | 2023-03-02 | 广东工业大学 | High efficiency combustion system for combustible ice |
| CN117516191A (en) * | 2023-10-25 | 2024-02-06 | 北京首钢股份有限公司 | Combustion method for metallurgical industry kiln |
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