CN112484062A - Energy-saving and emission-reducing system for tail flue gas of gas boiler - Google Patents
Energy-saving and emission-reducing system for tail flue gas of gas boiler Download PDFInfo
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- CN112484062A CN112484062A CN202011163265.5A CN202011163265A CN112484062A CN 112484062 A CN112484062 A CN 112484062A CN 202011163265 A CN202011163265 A CN 202011163265A CN 112484062 A CN112484062 A CN 112484062A
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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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/66—Preheating the combustion air or gas
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
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- 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
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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
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to the field of gas power generation, in particular to a gas boiler tail flue gas energy-saving and emission-reducing system, which comprises a gas boiler, a burner, a desulfurizing tower, a desulfurizing agent spraying system, a flue gas system, an air system, a gas system, a heat exchange device, a dust remover and a chimney, wherein the burner is arranged on the tail part of the gas boiler; the flue gas side outlet of an economizer of the gas boiler is communicated with a desulfurizing tower through a flue gas system, and a desulfurizing agent spraying system is communicated with the flue gas system; the desulfurizing tower is sequentially connected with a heat exchange device, a dust remover and a chimney through a flue gas pipeline; the gas boiler is provided with a burner, the air system is communicated with an air inlet of the heat exchange device, and an air outlet of the heat exchange device is communicated with the burner; the gas system is communicated with a gas inlet of the heat exchange device, and a gas outlet of the heat exchange device are communicated with the combustor. The invention adopts the flue gas treatment process of firstly desulfurizing and then cooling, can effectively improve the desulfurization efficiency, simultaneously reduces the low-temperature corrosion risk of the tail heat exchange surface, and improves the safety and the economical efficiency of the unit.
Description
Technical Field
The invention relates to the technical field of gas power generation, in particular to a gas boiler tail flue gas energy-saving and emission-reducing system.
Background
In the production process of iron and steel enterprises, a large amount of surplus coal gas is generated, and in order to improve economic benefit and environment, the recovery of the surplus coal gas for power generation is a common energy clean utilization measure for iron and steel. For a gas boiler, due to its own characteristics, the heat loss of exhaust gas accounts for more than 80% of the heat loss of the boiler, so that the reduction of the heat loss of exhaust gas is the most effective means for improving the efficiency of the gas boiler, and the most important factor for determining the heat loss of exhaust gas is the temperature of exhaust gas, so that the main way for improving the thermal efficiency of the boiler is to reduce the temperature of exhaust gas of the boiler.
At present, the common measure for reducing the exhaust gas temperature at the tail part of a boiler is to arrange an air preheater and increase the area of the air preheater, but the effect of reducing the exhaust gas temperature is limited, and the exhaust gas temperature at the outlet of the air preheater is still 200 ℃. In order to further reduce the flue gas temperature, a flue gas-gas heat exchanger is usually arranged behind an air preheater, the flue gas temperature can be further reduced to about 140 ℃ after passing through the flue gas-gas heat exchanger, and the flue gas temperature of part of steel enterprises can still reach about 160 ℃ after passing through the flue gas-gas heat exchanger due to higher gas temperature; or other cold source introducing measures are adopted to cool the flue gas, such as a condensed water heat exchanger is arranged, but the scheme increases the heat consumption of the steam turbine and influences the overall economy of the unit. Meanwhile, the coal gas often contains partial sulfur impurities, and the flue gas after combustion contains a certain amount of SO2For a gas boiler, the original flue gas acid dew point temperature of the boiler is about 120 ℃, and the final flue gas temperature after a flue gas-gas heat exchanger is about 140 ℃, which is basically close to the limit of each heat exchanger.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the energy-saving and emission-reducing system for the flue gas at the tail part of the gas boiler, which solves the problems that the emission requirement is met, the temperature of the flue gas at the tail part of the boiler is further reduced, the efficiency of the boiler is improved, all heat exchange surfaces can be protected, the low-temperature corrosion risk of the heat exchange surfaces is reduced, and the economical efficiency of a unit is improved.
In order to achieve the purpose, the technical scheme of the invention is a gas boiler tail flue gas energy-saving and emission-reducing system, which comprises a gas boiler, a burner, a desulfurizing tower, a desulfurizing agent spraying system, a flue gas system, an air system, a gas system, a heat exchange device, a dust remover and a chimney; the coal economizer of the gas boiler is communicated with the desulfurizing tower through a flue gas system, and the desulfurizing agent spraying system is communicated with the flue gas system; the desulfurizing tower is sequentially connected with a heat exchange device, a dust remover and a chimney through a flue gas pipeline; the gas boiler is provided with a burner, the air system is communicated with an air inlet of the heat exchange device, and an air outlet of the heat exchange device is communicated with the burner; the gas system is communicated with a gas inlet of the heat exchange device, and a gas outlet of the heat exchange device are communicated with the combustor.
Furthermore, the heat exchange device comprises an air heat exchange unit and a coal gas heat exchange unit which are arranged in parallel, a flue gas inlet of the air heat exchange unit and a flue gas inlet of the coal gas heat exchange unit are both communicated with a flue gas outlet of the desulfurizing tower, and a flue gas outlet of the air heat exchange unit and a flue gas outlet of the coal gas heat exchange unit are both communicated with a flue gas inlet of the dust remover; the air system is communicated with an air inlet of the air heat exchange unit, and an air outlet of the air heat exchange unit is communicated with the combustor; the coal gas system is communicated with a coal gas inlet of the coal gas heat exchange unit, and a coal gas outlet of the coal gas heat exchange unit is communicated with the combustor.
Furthermore, a flue gas inlet of the air heat exchange unit is communicated with the desulfurizing tower through a first flue gas inlet pipe, and a flue gas inlet of the coal gas heat exchange unit is communicated with the desulfurizing tower through a second flue gas inlet pipe; and the first flue gas inlet pipe and the second flue gas inlet pipe are both provided with flue gas adjusting air doors.
Furthermore, a flue gas outlet of the air heat exchange unit is communicated with the dust remover through a first flue gas outlet pipe, and a flue gas outlet of the coal gas heat exchange unit is communicated with the dust remover through a second flue gas outlet pipe; and the first smoke outlet pipe and the second smoke outlet pipe are both provided with smoke temperature sensors.
Further, the flue gas damper is interlocked with the flue gas temperature sensor.
Furthermore, soot blowers are respectively arranged on the smoke side of the air heat exchange unit and the smoke side of the coal gas heat exchange unit.
Furthermore, the gas heat exchange unit adopts a heat pipe type, the heat pipes are vertically arranged, the upper side is a gas flow, the lower side is a flue gas flow, and the middle part is separated by a partition plate; or the gas heat exchange unit adopts a plate type heat exchange type.
Furthermore, the air heat exchange units are horizontally arranged in a tubular mode, and the flue gas flows outside the tubes and the air flows inside the tubes; or the air heat exchange units are arranged vertically in a tubular mode, and the flue gas flows in the pipe and the air flows out of the pipe; or the air heat exchange unit adopts a heat pipe heat exchange type; or the air heat exchange unit adopts a plate type heat exchange type.
Further, the air system is in communication with a blower muffler via a blower.
Further, the dust remover is communicated with the chimney through an induced draft fan.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, a flue gas treatment process of firstly desulfurizing and then cooling is adopted, so that the desulfurization efficiency can be effectively improved, the low-temperature corrosion risk of the tail heat exchange surface is greatly reduced, and the safety and the economical efficiency of a unit are improved;
(2) according to the invention, the flue gas temperature at the tail part of the boiler is reduced by adopting a mode that the air heat exchange unit and the coal gas heat exchange unit are connected in parallel, and on the premise of not adopting an additional cold source, the flue gas temperature at the tail part of the boiler is further reduced only by air and fuel required by combustion of the boiler, so that the boiler efficiency is improved, and the overall economy of the unit is improved;
(3) according to the invention, the flue gas quantity entering the air heat exchange unit and the coal gas heat exchange unit is distributed by adopting the flue gas adjusting air door, and meanwhile, the flue gas temperature at the outlets of the air heat exchange unit and the coal gas heat exchange unit is monitored by adopting the flue gas temperature sensor and fed back to the flue gas adjusting air door to adjust the flue gas quantity, so that the air heat exchange unit and the coal gas heat exchange unit can efficiently exchange heat, and the flue gas temperature is reduced;
(4) the invention adopts the dust remover to remove dust from the desulfurized and cooled flue gas so as to meet the emission standard, and meanwhile, the soot blowers are arranged on the flue gas sides of the air heat exchange unit and the coal gas heat exchange unit, so that the soot accumulated on the heat exchange surface can be effectively removed in time, and the heat exchange effect is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a gas boiler tail flue gas energy saving and emission reduction system provided by an embodiment of the invention;
in the figure: 1. a flue gas system; 2. an air system; 3. a gas system; 4. an air heat exchange unit; 5. a gas heat exchange unit; 6. a flue gas damper; 7. a flue gas temperature sensor; 8. a desulfurizing tower; 9. a gas boiler; 10. a burner; 11. a coal economizer; 12. spraying a desulfurizing agent into the system; 13. a soot blower; 14. a dust remover; 15. an induced draft fan; 16. a blower; 17. a blower muffler; 18. and (4) a chimney.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the embodiment provides an energy-saving and emission-reducing system for flue gas at the tail of a gas boiler, which includes a gas boiler 9, a burner 10, a desulfurizing tower 8, a desulfurizing agent spraying system 12, a flue gas system 1, an air system 2, a gas system 3, a heat exchange device, a dust remover 14 and a chimney 18; the flue gas outlet side of an economizer 11 of the gas boiler 9 is communicated with a desulfurizing tower 8 through a flue gas system 1, and a desulfurizing agent spraying system 12 is communicated with the flue gas system 1; the desulfurizing tower 8 is sequentially connected with a heat exchange device, a dust remover 14 and a chimney 18 through a flue gas pipeline; a burner 10 is installed on the gas boiler 9, the air system 2 is communicated with an air inlet of the heat exchange device, and an air outlet of the heat exchange device is communicated with the burner 10; the coal gas system 3 is communicated with a coal gas inlet of the heat exchange device, and a coal gas outlet of the heat exchange device are communicated with the combustor 10. In the embodiment, after the desulfurizer is sprayed into the system 12 and arranged in the economizer 11, the temperature of the flue gas is 300 ℃ at the moment, the activity of the desulfurizer can be improved, so that the flue gas desulfurization treatment can be carried out more efficiently, the desulfurization tower 8 is arranged on the flue, the desulfurization effect is further enhanced, and simultaneously, the desulfurization effect can be ensured to be still better at low load, after accounting, the consumption of the desulfurizer (such as baking soda) can be reduced after the desulfurization is arranged in the economizer, the dust content in the desulfurized flue gas is smaller, and the influence on the rear heat exchange surface is smaller; and the temperature is reduced after the flue gas is desulfurized, so that the low-temperature corrosion risk of the heated surface can be greatly reduced, and the safety and the economical efficiency of the unit are improved.
In the embodiment, dry desulfurization is adopted, a desulfurizer injection point is arranged on a flue gas system 1 at the outlet of a gas boiler 9, and the desulfurizer and SO in flue gas2Reacting in the flue gas system 1, and then entering a desulfurizing tower 8 to further enhance the mixing of a desulfurizing agent and the flue gas and increase the reaction time; the desulfurized flue gas enters a heat exchange device for heat exchange and then is sent into a dust remover 14 for dust removal treatment, so that the dust emission in the flue gas meets the national emission standard.
Further, the heat exchange device comprises an air heat exchange unit 4 and a coal gas heat exchange unit 5 which are arranged in parallel, a flue gas inlet of the air heat exchange unit 4 and a flue gas inlet of the coal gas heat exchange unit 5 are both communicated with a flue gas outlet of the desulfurizing tower 8, and a flue gas outlet of the air heat exchange unit 4 and a flue gas outlet of the coal gas heat exchange unit 5 are both communicated with a flue gas inlet of the dust remover 14; the air system 2 is communicated with an air inlet of the air heat exchange unit 4, and an air outlet of the air heat exchange unit 4 is communicated with the combustor 10; the coal gas system 3 is communicated with a coal gas inlet of the coal gas heat exchange unit 5, and a coal gas outlet of the coal gas heat exchange unit 5 is communicated with the combustor 10. The flue gas after the desulfurization is cooled by adopting the mode that the air heat exchange unit 4 and the coal gas heat exchange unit 5 are connected in parallel, the safe and stable operation of the unit is ensured, meanwhile, the cooling capacity of cold source air and cold source coal gas can be utilized to the maximum extent, the smoke exhaust temperature is reduced to the maximum extent, the unit efficiency is improved, and the cost is reduced.
Further, a flue gas inlet of the air heat exchange unit 4 is communicated with the desulfurizing tower 8 through a first flue gas inlet pipe, and a flue gas inlet of the coal gas heat exchange unit 5 is communicated with the desulfurizing tower 8 through a second flue gas inlet pipe; the first flue gas inlet pipe and the second flue gas inlet pipe are respectively provided with a flue gas adjusting air door 6, and the amount of flue gas entering each heat exchange surface can be adjusted.
Furthermore, the flue gas outlet of the air heat exchange unit 4 is communicated with the dust remover 14 through a first flue gas outlet pipe, and the flue gas outlet of the coal gas heat exchange unit 5 is communicated with the dust remover 14 through a second flue gas outlet pipe; first flue gas exit tube with all be equipped with flue gas temperature sensor 7 on the second flue gas exit tube, can in time feed back the cooling effect of heat-transfer surface to flue gas distribution is carried out to flue gas damper 6.
Further, the flue gas damper 6 is interlocked with the flue gas temperature sensor 7. According to the embodiment, the flue gas temperature of the outlet of the air heat exchange unit 4 and the outlet of the coal gas heat exchange unit 5, which is detected by the flue gas temperature sensor, is adjusted, the opening degree of the flue gas adjusting air door 6 at the inlet of the air heat exchange unit 4 and/or the opening degree of the flue gas adjusting air door 6 at the inlet of the coal gas heat exchange unit 5 are adjusted, the distribution of flue gas is reasonable, the air heat exchange unit 4 and the coal gas heat exchange unit 5 can efficiently exchange heat, and the cooling effect of the flue gas reaches.
Furthermore, the flue gas side of the air heat exchange unit 4 and the flue gas side of the coal gas heat exchange unit 5 are respectively provided with a soot blower 13, so that accumulated dust on a heat exchange surface can be effectively removed in time, and the heat exchange effect is ensured.
Furthermore, the gas heat exchange unit 5 can adopt a heat pipe type and the heat pipes are vertically arranged, the upper side is a gas flow, the lower side is a flue gas flow, and the middle part is separated by a partition plate; the heat pipes of the coal gas heat exchange unit 5 adopt finned pipes, so that the system safety is ensured while the smoke exhaust temperature is reduced; the heat pipes on the gas inlet side and the flue gas outlet side of the gas heat exchange unit 5 are made of ND steel, so that the corrosion resistance of the heat exchange pipes is further improved, and the service life of the gas heat exchange unit 5 is prolonged. In this embodiment, the gas heat exchange unit 5 may also adopt a plate type heat exchange type.
Furthermore, the air heat exchange unit 4 can adopt a tubular air preheater, so that the service life of the air heat exchange unit 4 is ensured, and the investment cost of the whole system can be reduced; the device can be horizontally arranged, a flue gas outside pipe flowing process and an air inside pipe flowing process, or can be vertically arranged by adopting a tubular air preheater, a flue gas inside pipe flowing process and an air outside pipe flowing process; the heat exchange tube of the air heat exchange unit 4 is externally coated with enamel, and the heat exchange tube at the side part of the air inlet of the air heat exchange unit 4 is made of ND steel, so that the corrosion resistance of the heat exchange tube is further improved, and the service life of the air heat exchange unit 4 is prolonged. The air heat exchange unit 4 can also adopt a heat pipe heat exchange type or a plate heat exchange type.
Further, the air system 2 communicates with a blower muffler 17 through a blower 16.
Further, the dust remover 14 is communicated with the chimney 18 through an induced draft fan 15, and the flue gas dedusted by the dust remover 14 is pressurized through the induced draft fan 15 and then discharged through the chimney 18; the dust collector 14 may employ a bag-type dust collector.
The process of reducing the exhaust gas temperature at the tail part of the boiler by adopting the energy-saving and emission-reducing system for the tail part of the gas boiler in the embodiment is as follows:
air required by combustion of boiler fuel is sucked from the atmosphere through a blower 16 and a blower silencer 17, and is sent into a combustor 10 after heat exchange of an air heat exchange unit 4 to be mixed with the fuel to assist fuel combustion; the fuel is sent from a pipe network, and is sent into the combustor 10 for combustion after being subjected to heat exchange by the coal gas heat exchange unit 5; the flue gas after burning is discharged into a flue gas system after the flue gas passes through each heat exchange surface of a gas boiler 9, for a unit above ultrahigh pressure, the temperature of the flue gas at the outlet of an economizer 11 at the tail part of the gas boiler 9 is 300 ℃, a desulfurizer spraying system 12 is arranged on a flue at the outlet of the economizer 11 to carry out desulfurization treatment on the flue gas, the flue gas and the desulfurizer are fully mixed and react in a desulfurizing tower 8 and the flue, the flue gas after desulfurization treatment is respectively sent into an air heat exchange unit 4 and a gas heat exchange unit 5 through a flue gas adjusting damper 6 to carry out cooling treatment, flue gas temperature sensors 7 are arranged on the outlet flues of the air heat exchange unit 4 and the gas heat exchange unit 5 to track the cooling effect and feed the cooling effect back to a flue gas adjusting damper 6 to carry out flue gas amount adjustment, the reasonable distribution of the; after the flue gas after desulfurization and temperature reduction is dedusted by the deduster 14, the purified flue gas is pressurized by the induced draft fan 15 and then is discharged into the atmosphere through the chimney 18.
After the flue gas is desulfurized, the pollutant SO2The concentration can meet the national emission requirement and is 35mg/Nm at the corresponding emission limit value3The acid dew point temperature of the flue gas is about 80 ℃. After dust removal by the dust remover 14, the concentration of pollutant dust can also meet the national emission requirement, thereby achieving the effect of emission reduction. After the flue gas is cooled by the air heat exchange unit 4 and the coal gas heat exchange unit 5, the temperature can be reduced to 100 ℃, the flue gas waste heat can be effectively recovered, and compared with the conventional scheme, the overall efficiency of the boiler can be improved by 2% -3%, so that the energy-saving effect is achieved. Meanwhile, the embodiment adopts a treatment scheme of firstly desulfurizing and then cooling, the temperature of the cooled flue gas is still higher than the acid dew point of the flue gas by about 20 ℃, certain safety margin is provided, the safe long-term operation of each heat exchange surface can be ensured, and the economical efficiency of the unit is improved.
The energy-saving and emission-reducing system for the tail flue gas of the gas boiler is not limited to tail flue gas treatment of the gas boiler, and is also suitable for tail flue gas treatment of boilers burning other fuels; the energy-saving and emission-reducing system for the tail flue gas of the gas boiler is not limited to the system for cooling the flue gas by adopting the air heat exchange unit and the gas heat exchange unit, and is also suitable for systems with other cold sources for cooling the flue gas.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a gas boiler afterbody flue gas energy saving and emission reduction system which characterized in that: comprises a gas boiler, a burner, a desulfurizing tower, a desulfurizing agent spraying system, a flue gas system, an air system, a gas system, a heat exchange device, a dust remover and a chimney; the coal economizer of the gas boiler is communicated with the desulfurizing tower through a flue gas system, and the desulfurizing agent spraying system is communicated with the flue gas system; the desulfurizing tower is sequentially connected with a heat exchange device, a dust remover and a chimney through a flue gas pipeline; the gas boiler is provided with a burner, the air system is communicated with an air inlet of the heat exchange device, and an air outlet of the heat exchange device is communicated with the burner; the gas system is communicated with a gas inlet of the heat exchange device, and a gas outlet of the heat exchange device are communicated with the combustor.
2. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 1, characterized in that: the heat exchange device comprises an air heat exchange unit and a coal gas heat exchange unit which are arranged in parallel, a flue gas inlet of the air heat exchange unit and a flue gas inlet of the coal gas heat exchange unit are both communicated with a flue gas outlet of the desulfurizing tower, and a flue gas outlet of the air heat exchange unit and a flue gas outlet of the coal gas heat exchange unit are both communicated with a flue gas inlet of the dust remover; the air system is communicated with an air inlet of the air heat exchange unit, and an air outlet of the air heat exchange unit is communicated with the combustor; the coal gas system is communicated with a coal gas inlet of the coal gas heat exchange unit, and a coal gas outlet of the coal gas heat exchange unit is communicated with the combustor.
3. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 2, characterized in that: the flue gas inlet of the air heat exchange unit is communicated with the desulfurizing tower through a first flue gas inlet pipe, and the flue gas inlet of the coal gas heat exchange unit is communicated with the desulfurizing tower through a second flue gas inlet pipe; and the first flue gas inlet pipe and the second flue gas inlet pipe are both provided with flue gas adjusting air doors.
4. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 3, characterized in that: the flue gas outlet of the air heat exchange unit is communicated with the dust remover through a first flue gas outlet pipe, and the flue gas outlet of the coal gas heat exchange unit is communicated with the dust remover through a second flue gas outlet pipe; and the first smoke outlet pipe and the second smoke outlet pipe are both provided with smoke temperature sensors.
5. The energy-saving and emission-reducing system for tail flue gas of the gas boiler, as claimed in claim 4, is characterized in that: the flue gas damper is interlocked with the flue gas temperature sensor.
6. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 2, characterized in that: soot blowers are respectively arranged on the smoke side of the air heat exchange unit and the smoke side of the coal gas heat exchange unit.
7. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 2, characterized in that: the coal gas heat exchange unit adopts a heat pipe type, the heat pipes are vertically arranged, the upper side is a coal gas flow, the lower side is a flue gas flow, and the middle part is separated by a partition plate; or the gas heat exchange unit adopts a plate type heat exchange type.
8. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 2, characterized in that: the air heat exchange units are horizontally arranged in a tubular mode, and the flue gas flows outside the tubes and the air flows inside the tubes; or the air heat exchange units are arranged vertically in a tubular mode, and the flue gas flows in the pipe and the air flows out of the pipe; or the air heat exchange unit adopts a heat pipe heat exchange type; or the air heat exchange unit adopts a plate type heat exchange type.
9. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 1, characterized in that: the air system is communicated with the blower silencer through the blower.
10. The energy-saving and emission-reducing system for tail flue gas of the gas boiler as claimed in claim 1, characterized in that: the dust remover is communicated with the chimney through an induced draft fan.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011163265.5A CN112484062A (en) | 2020-10-27 | 2020-10-27 | Energy-saving and emission-reducing system for tail flue gas of gas boiler |
| PCT/CN2021/099375 WO2022088686A1 (en) | 2020-10-27 | 2021-06-10 | Gas boiler tail flue gas energy-saving and emission-reduction system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011163265.5A CN112484062A (en) | 2020-10-27 | 2020-10-27 | Energy-saving and emission-reducing system for tail flue gas of gas boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112484062A true CN112484062A (en) | 2021-03-12 |
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| CN202011163265.5A Pending CN112484062A (en) | 2020-10-27 | 2020-10-27 | Energy-saving and emission-reducing system for tail flue gas of gas boiler |
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| Country | Link |
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| CN (1) | CN112484062A (en) |
| WO (1) | WO2022088686A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113828116A (en) * | 2021-10-11 | 2021-12-24 | 常州市新港热电有限公司 | Energy-concerving and environment-protective type desulfurizing tower that waste heat was recycled |
| WO2022088686A1 (en) * | 2020-10-27 | 2022-05-05 | 中冶南方都市环保工程技术股份有限公司 | Gas boiler tail flue gas energy-saving and emission-reduction system |
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| WO2022088686A1 (en) | 2022-05-05 |
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