CN104196629A - Fuel gas enthalpy-adding humidification device - Google Patents
Fuel gas enthalpy-adding humidification device Download PDFInfo
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- CN104196629A CN104196629A CN201410447743.3A CN201410447743A CN104196629A CN 104196629 A CN104196629 A CN 104196629A CN 201410447743 A CN201410447743 A CN 201410447743A CN 104196629 A CN104196629 A CN 104196629A
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- water
- fuel gas
- humidification
- hot water
- damping machine
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- 239000002737 fuel gas Substances 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 155
- 239000007789 gas Substances 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000013016 damping Methods 0.000 claims description 44
- 239000000779 smoke Substances 0.000 claims description 24
- 239000008236 heating water Substances 0.000 claims description 21
- 238000011084 recovery Methods 0.000 claims description 11
- 239000002918 waste heat Substances 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 4
- 238000011109 contamination Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 9
- 238000010793 Steam injection (oil industry) Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 7
- 239000000446 fuel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a fuel gas enthalpy-adding humidification device. The fuel gas enthalpy-adding humidification device comprises a humidifier, a humidified water heater and an over-heater, wherein a gas inlet and a gas outlet are formed in the lower part and the top end of the humidifier respectively; a water inlet and a water outlet are formed in the upper part and the bottom end of the humidifier respectively; the humidifier is used for humidifying fuel gas entering the gas inlet by using humidified hot water entering the water inlet; a water inlet of the humidified water heater is connected to the water outlet of the humidifier, and a water outlet of the humidified water heater is connected to the water inlet of the humidifier; the humidified water heater is used for supplying the circulating humidified hot water to the humidifier; a gas inlet of the over-heater is connected to the gas outlet of the humidifier, and a gas outlet of the over-heater is connected to a gas turbine; the over-heater is used for heating wet fuel gas discharged from the gas outlet of the humidifier and then conveying the wet fuel gas into the gas turbine. According to the fuel gas enthalpy-adding humidification device, the humidified hot water and the fuel gas reversely flow in the humidifier to be in direct contact, the thermodynamics of cold and hot fluid in the process is matched with a steam injection process, and the loss of available energy is reduced.
Description
Technical field
The present invention relates to gas turbine technology field, relate in particular to a kind of fuel gas and increase enthalpy humidification device.
Background technique
Integral coal gasification combustion and steam combined cycle (IGCC) is to realize the efficient advanced generation technology utilizing of Coal Clean.In IGCC, coal gas is through purifying the fuel gas that is used as gas turbine, and the hot NO that combustion process causes
xit is its main discharging pollutants.For reducing IGCC system NO
xdischarge, the method that existing unit adopts more to be injected thinner, reduce combustion flame temperature in fuel gas, conventional thinner is mainly nitrogen and water vapour.
Because gas turbine fuel system pressure in IGCC is conventionally more than 1.5MPa, adopt the method for steam injection to need high parameter, high-quality steam.From thermodynamics, produce high parameter steam and will consume heat of high temperature, and high-quality requirement increases cost of water treatment, the mixed process of steam and fuel gas can cause the higher available loss of energy simultaneously, thereby the method for steam injection fuel diluted can reduce the thermal efficiency and the Economy of whole system to a certain extent.
Summary of the invention
The invention provides a kind of fuel gas and increase enthalpy humidification device, solve low, the less economical problem of existing process heat efficiency.
For achieving the above object, technological scheme of the present invention is: a kind of fuel gas increases enthalpy humidification device, comprising:
Damping machine, its underpart and top arrange respectively suction port and air outlet, and its top and bottom arrange respectively water intake and water outlet, for utilizing the damp-heat water that adds being entered by water intake to carry out humidification to the fuel gas being entered by suction port;
Superheater, on it, be provided with hot water inlet, hot water outlet, suction port, air outlet, described air inlet duct connects damping machine air outlet, and air outlet pipeline connects gas turbine, after heating, sends into gas turbine for the wet fuel gas to being discharged by damping machine air outlet; Described hot water inlet pipeline connects the hot water exhaust port of gas turbine smoke waste heat recovery system, hot water outlet pipeline connects the heating water import of humidification water heater, for the hot water that utilizes gas turbine smoke discharging residual heat to obtain, the fuel gas by superheater is heated, and the hot water after heat exchange is sent into humidification water heater;
Humidification water heater, is provided with water intake, water outlet on it, heating water import, heating water outlet, described water intake is connected to the water outlet of damping machine by pipeline, water outlet is connected to the water intake of described damping machine by pipeline, be used to described damping machine that the damp-heat water that adds of circulation is provided; Heating water import is connected with superheater hot water outlet pipeline, and heating water outlet connects the water intake of gas turbine smoke waste heat recovery system, for the hot water that utilizes gas turbine smoke evacuation low temperature exhaust heat to obtain, humidification water is heated.
Further, also comprise: superheater bypass, is arranged between superheater hot water inlet pipeline and hot water outlet pipeline, for being communicated with superheater hot water inlet pipeline and hot water outlet pipeline; Flow control valve, is arranged in described superheater bypass, for regulating the hot water flow that flows through superheater, to control the wet fuel gas degree of superheat.
Also comprise: the first recycle pump, be arranged between the heating water outlet of described humidification water heater and the entry port of gas turbine smoke evacuation low temperature exhaust heat hot water, for the hot water after the cooling that the outlet of humidification water heater heating water is discharged, send gas turbine smoke waste heat recovery system back to, between described gas turbine smoke waste heat recovery system, damping machine and superheater, form the peripheral passage of hot water; The second recycle pump, is arranged between described damping machine water outlet and described humidification water heater water intake, for form the circulation loop that adds damp-heat water between described damping machine and humidification water heater.
Also comprise: filler device, is arranged between the water intake and suction port in described damping machine, for increasing the area of contact adding between damp-heat water and fuel gas.
Also comprise: drain pipe, be arranged at the bottom of described damping machine, in its pipeline, flow control valve is set, for according to preset flow discharge humidification water, to prevent contamination build-up in humidification water; Water-adding pipe, is arranged at the bottom of described damping machine, in its pipeline, small pump is set, for filling into humidification water according to preset flow to described damping machine.
Described damping machine is packing tower, hollow tower or plate column.Described superheater is shell-and-tube heat exchanger or fin-tube type heat exchanger; Described humidification water heater is shell-and-tube heat exchanger, plate type heat exchanger or heat pipe heat exchanger.
Fuel gas for gas turbine of the present invention increases enthalpy humidification device and has following beneficial effect:
(1) add damp-heat water and directly contact with fuel gas adverse current in damping machine, humidification hot water temperature reduces, and the humidity and temperature of fuel gas all increases, and this process cold fluid and hot fluid thermomechanics coupling is better than steam injection process, and the available loss of energy reduces;
(2) by the hot water that utilizes gas turbine smoke waste heat recovery system to obtain, carry out the heating of wet fuel gas and humidification water, can make the thermal efficiency and the economical raising of whole system;
(3) between damping machine water intake and suction port, filler device is set, thereby has increased the area of contact adding between damp-heat water and fuel gas, and then strengthened heat and mass, strengthened the increasing enthalpy humidifying effect of fuel gas.
Accompanying drawing explanation
Fig. 1 is the structural representation that embodiment of the present invention fuel gas increases enthalpy humidification device.
1, damping machine; 2, filler device; 3, drain pipe; 4, humidification water heater; 5, water-adding pipe; 6, superheater; 7, superheater bypass; 8-1, the second recycle pump; 8-2 the 3rd recycle pump; 8-3, the first recycle pump; 9-1 flow control valve, 9-2 flow control valve.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.It should be noted that, in accompanying drawing or specification description, similar or identical part is all used identical figure number.The implementation that does not illustrate in accompanying drawing or describe is form known to a person of ordinary skill in the art in affiliated technical field.
In addition, although the demonstration of the parameter that comprises particular value can be provided herein, should be appreciated that, parameter is without definitely equaling corresponding value, but can in acceptable error margin or design constraints, be similar to corresponding value.In addition, the direction term of mentioning in following examples, such as " on ", D score, 'fornt', 'back', " left side ", " right side " etc., be only the direction with reference to accompanying drawing.Therefore, the direction term of use is to be not used for limiting the present invention for illustrating.
The invention provides a kind of fuel gas and increase enthalpy humidification device, this device has proposed the mode that a kind of new fuel gas increases enthalpy humidifying, wherein superheater utilizes the hot water heating humidification fuel gas that gas turbine smoke discharging residual heat is produced, thereby reduce gas turbine discharged nitrous oxides, improve thermal efficiency of gas turbine simultaneously.
In one exemplary embodiment of the present invention, provide a kind of fuel gas to increase enthalpy humidification device.Fig. 1 is the structural representation that embodiment of the present invention gas turbine fuel gas increases enthalpy humidification device.As shown in Figure 1, the present embodiment gas turbine fuel gas increasing enthalpy humidification device comprises: damping machine 1, filler device 2, drain pipe 3, plate type heat exchanger 4, water-adding pipe 5, shell-and-tube heat exchanger 6, superheater bypass 7, circulating water pump (8-1,8-2,8-3) and flow control valve (9-1,9-2).Below respectively the present embodiment fuel gas being increased to enthalpy humidification device all parts is elaborated.
Please refer to Fig. 1, damping machine 1 is packing tower, and its underpart and top arrange respectively suction port and air outlet, and its top and bottom arrange respectively water intake and water outlet.The combustion gas being entered by suction port enters the rear rising of damping machine 1, contacts after increase humidity with the damp-heat water that adds being entered by water intake, by air outlet, is discharged, and the remaining damp-heat water that adds is discharged by water outlet.Add damp-heat water and directly contact with fuel gas countercurrent direction in packing tower, the humidity and temperature of fuel gas all increases, and humidification hot water temperature reduces, and this process cold fluid and hot fluid thermomechanics coupling is better than steam injection process, and the available loss of energy reduces.
Filler device 2 is arranged between the water intake and suction port in damping machine 1, for the area of contact adding between damp-heat water and fuel gas by increase, carrys out heat and mass transfer enhancement, strengthens the increasing enthalpy humidifying effect of fuel gas.
Please refer to Fig. 1, superheater 6 is shell-and-tube heat exchanger, and its suction port is connected to damping machine 1 air outlet by connecting tube, and air outlet is connected to gas turbine.The effect of superheater 6 be the further heat humidifier 1 wet fuel gas of discharging to superheat state, prevent water vapour condensation in pipeline wherein.The wet fuel pneumatic transmission of superheat state enters gas turbine and burns.
The heating water import of superheater 6 is connected to the hot water exhaust port of gas turbine smoke evacuation low temperature exhaust heat reclaiming system by connecting tube, for utilizing the default hot water obtaining of gas turbine smoke evacuation low temperature to heat the fuel gas by superheater 6.Between superheater 6 heating water inlet pipelines and heating water outlet conduit, superheater bypass 7 is set, flow control valve 9-2 is set in superheater bypass 7, its effect is to regulate the hot water flow that flows through superheater, to control the wet fuel gas degree of superheat.
It will be apparent to those skilled in the art that except shell-and-tube heat exchanger, superheater 6 can be also the heat exchanger of other types, for example: fin-tube type heat exchanger.
The hot water heating humidification fuel gas that the present embodiment utilizes gas turbine smoke waste heat recovery system to produce, the humidification water that enters damping machine circulates in the loop of damping machine and humidification water heater formation, the hot water of not producing with gas turbine smoke discharging residual heat mixes, thereby avoided the impurity in hot water to carry secretly and enter fuel gas with water droplet, make hot-water return and fuel system mutually isolate simultaneously, guaranteed the safe operation of gas turbine.
Please refer to Fig. 1, humidification water heater 4 is shell-and-tube heat exchanger, for the hot water that utilizes gas turbine smoke evacuation low temperature exhaust heat to produce, humidification water is heated.The humidification water water intake of this humidification water heater 4 is connected to the water outlet of damping machine 1 by connecting tube and pump 8-1; Its humidification water water outlet is communicated with the water intake of damping machine 1 by connecting tube, forms circulation loop.The effect of pump 8-1 is to make humidification water continuous-flow in above-mentioned circulation loop.
The heating water that the heating water import of humidification water heater 4 is connected to superheater 6 by connecting tube exports, and its heating water outlet is connected to the entry port of gas turbine smoke evacuation low temperature exhaust heat hot water by connecting tube and recycle pump 8-3.The effect of recycle pump 8-3 is that the hot water after the cooling that the outlet of humidification water heater heating water is discharged is sent gas turbine smoke waste heat recovery system back to.
It will be apparent to those skilled in the art that except shell-and-tube heat exchanger, humidification water heater 4 can also be plate type heat exchanger or heat pipe heat exchanger.
Please refer to Fig. 1, damping machine 1 bottom arranges drain pipe 3, and flow control valve 9-1 is set on drain pipe 3, and flow control valve 9-1 effect is with certain flow discharge humidification water, prevents contamination build-up in humidification water.Damping machine 1 suction tude below, bottom arranges water-adding pipe 5, and small pump 8-2 is set on water-adding pipe 5, and small pump 8-2 is for injecting humidification water with certain flow to damping machine, and supplementary humidification process is evaporated and the used up humidification water of blowdown.
So far, the present embodiment fuel gas increasing enthalpy humidification device is introduced complete.Those skilled in the art are based on above-mentioned explanation, and should increase entropy humidification device to fuel gas of the present invention has had clearly understanding.It should be noted that, the above-mentioned definition to each element is not limited in various concrete structures or the shape of mentioning in mode of execution, and those of ordinary skill in the art can know simply and replace it, for example:
(1) damping machine 1 can also adopt the forms such as hollow tower, plate column;
(2) flow control valve 9-1 can replace with drain valve.
In sum, fuel gas of the present invention increases in enthalpy humidification device, and the hot water heating humidification fuel gas that utilizes gas turbine smoke discharging residual heat to produce, can be used for reducing gas turbine discharged nitrous oxides, improves thermal efficiency of gas turbine simultaneously.
Above-described specific embodiment; object of the present invention, technological scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1. fuel gas increases an enthalpy humidification device, it is characterized in that, comprising:
Damping machine, its underpart and top arrange respectively suction port and air outlet, and its top and bottom arrange respectively water intake and water outlet, for utilizing the damp-heat water that adds being entered by water intake to carry out humidification to the fuel gas being entered by suction port;
Superheater, on it, be provided with hot water inlet, hot water outlet, suction port, air outlet, described air inlet duct connects damping machine air outlet, and air outlet pipeline connects gas turbine, after heating, sends into gas turbine for the wet fuel gas to being discharged by damping machine air outlet; Described hot water inlet pipeline connects the hot water exhaust port of gas turbine smoke waste heat recovery system, hot water outlet pipeline connects the heating water import of humidification water heater, for the hot water that utilizes gas turbine smoke discharging residual heat to obtain, the fuel gas by superheater is heated, and the hot water after heat exchange is sent into humidification water heater;
Humidification water heater, is provided with water intake, water outlet on it, heating water import, heating water outlet, described water intake is connected to the water outlet of damping machine by pipeline, water outlet is connected to the water intake of described damping machine by pipeline, be used to described damping machine that the damp-heat water that adds of circulation is provided; Heating water import is connected with superheater hot water outlet pipeline, and heating water outlet connects the water intake of gas turbine smoke waste heat recovery system, for the hot water that utilizes gas turbine smoke evacuation low temperature exhaust heat to obtain, humidification water is heated.
2. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, also comprises:
Superheater bypass, is arranged between superheater hot water inlet pipeline and hot water outlet pipeline, for being communicated with superheater hot water inlet pipeline and hot water outlet pipeline;
Flow control valve, is arranged in described superheater bypass, for regulating the hot water flow that flows through superheater, to control the wet fuel gas degree of superheat.
3. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, also comprises:
The first recycle pump, be arranged between the heating water outlet of described humidification water heater and the entry port of gas turbine smoke evacuation low temperature exhaust heat hot water, for the hot water after the cooling that the outlet of humidification water heater heating water is discharged, send gas turbine smoke waste heat recovery system back to, between described gas turbine smoke waste heat recovery system, damping machine and superheater, form the peripheral passage of hot water.
4. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, also comprises:
The second recycle pump, is arranged between described damping machine water outlet and described humidification water heater water intake, for form the circulation loop that adds damp-heat water between described damping machine and humidification water heater.
5. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, also comprises:
Filler device, is arranged between the water intake and suction port in described damping machine, for increasing the area of contact adding between damp-heat water and fuel gas.
6. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, also comprises:
Drain pipe, is arranged at the bottom of described damping machine, in its pipeline, flow control valve is set, for according to preset flow discharge humidification water, to prevent contamination build-up in humidification water;
Water-adding pipe, is arranged at the bottom of described damping machine, in its pipeline, small pump is set, for filling into humidification water according to preset flow to described damping machine.
7. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, described damping machine is packing tower, hollow tower or plate column.
8. fuel gas according to claim 1 increases enthalpy humidification device, it is characterized in that, described superheater is shell-and-tube heat exchanger or fin-tube type heat exchanger; Described humidification water heater is shell-and-tube heat exchanger, plate type heat exchanger or heat pipe heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410447743.3A CN104196629A (en) | 2014-09-04 | 2014-09-04 | Fuel gas enthalpy-adding humidification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410447743.3A CN104196629A (en) | 2014-09-04 | 2014-09-04 | Fuel gas enthalpy-adding humidification device |
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| Publication Number | Publication Date |
|---|---|
| CN104196629A true CN104196629A (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410447743.3A Pending CN104196629A (en) | 2014-09-04 | 2014-09-04 | Fuel gas enthalpy-adding humidification device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101220A (en) * | 2017-06-15 | 2017-08-29 | 中国科学院工程热物理研究所 | It is a kind of to reduce the method and system of gas fired-boiler NOx emission |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129768A (en) * | 1994-12-19 | 1996-08-28 | 福斯特·惠勒开发公司 | Power process utilizing humidified combusted air to gas turbine |
| CN1256358A (en) * | 1998-11-13 | 2000-06-14 | 普拉塞尔技术有限公司 | Amplification of gas turbine power |
| EP1132594B1 (en) * | 1998-10-23 | 2006-02-15 | Hitachi, Ltd. | Gas turbine power generation equipment and air humidifying apparatus |
| US20110265488A1 (en) * | 2010-04-29 | 2011-11-03 | General Electric Company | ALTERNATE METHOD FOR DILUENT INJECTION FOR GAS TURBINE NOx EMISSIONS CONTROL |
| CN102852645A (en) * | 2011-06-29 | 2013-01-02 | 通用电气公司 | System for fuel gas moisturization and heating |
| CN204152646U (en) * | 2014-09-04 | 2015-02-11 | 山西潞安矿业(集团)有限责任公司 | Fuel gas increases enthalpy humidification device |
-
2014
- 2014-09-04 CN CN201410447743.3A patent/CN104196629A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129768A (en) * | 1994-12-19 | 1996-08-28 | 福斯特·惠勒开发公司 | Power process utilizing humidified combusted air to gas turbine |
| EP1132594B1 (en) * | 1998-10-23 | 2006-02-15 | Hitachi, Ltd. | Gas turbine power generation equipment and air humidifying apparatus |
| CN1256358A (en) * | 1998-11-13 | 2000-06-14 | 普拉塞尔技术有限公司 | Amplification of gas turbine power |
| US20110265488A1 (en) * | 2010-04-29 | 2011-11-03 | General Electric Company | ALTERNATE METHOD FOR DILUENT INJECTION FOR GAS TURBINE NOx EMISSIONS CONTROL |
| CN102852645A (en) * | 2011-06-29 | 2013-01-02 | 通用电气公司 | System for fuel gas moisturization and heating |
| CN204152646U (en) * | 2014-09-04 | 2015-02-11 | 山西潞安矿业(集团)有限责任公司 | Fuel gas increases enthalpy humidification device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101220A (en) * | 2017-06-15 | 2017-08-29 | 中国科学院工程热物理研究所 | It is a kind of to reduce the method and system of gas fired-boiler NOx emission |
| CN107101220B (en) * | 2017-06-15 | 2023-08-15 | 中国科学院工程热物理研究所 | Method and system for reducing NOx emission of gas boiler |
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Application publication date: 20141210 |