CN107559875B - A kind of combustion gas method that gas furnace discharged nitrous oxides are effectively reduced - Google Patents
A kind of combustion gas method that gas furnace discharged nitrous oxides are effectively reduced Download PDFInfo
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- CN107559875B CN107559875B CN201610622775.1A CN201610622775A CN107559875B CN 107559875 B CN107559875 B CN 107559875B CN 201610622775 A CN201610622775 A CN 201610622775A CN 107559875 B CN107559875 B CN 107559875B
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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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
Abstract
The invention discloses a kind of combustion gas methods that gas furnace discharged nitrous oxides are effectively reduced, the method is to carry out warming and humidifying to the combustion air before entering combustion system by heating humidification system, by ignition temperature control below the threshold value for only generating few nitrogen oxides；Flue gas is cooled down and is washed to flue gas after burning by residual neat recovering system after burning.The present invention is lower to combustion system calls, using burner combination this method of common resistance to high humility, can achieve the purpose that discharged nitrous oxides are effectively reduced, save improvement of manufacturing line cost；And the setting of heat up humidification system and residual neat recovering system takes into account two aspect technical indicator of pollutant emission control and the superelevation thermal efficiency, therefore this method is the comprehensive integrated technology of cleaning burning and low pollution emission.
Description
Technical field
The present invention relates to a kind of furnace combustion gas methods of combustion gas, in particular to one kind is by effective to combustion air heating and moistening
Reduce the combustion gas method of gas furnace discharged nitrous oxides.
Background technique
In recent years, China's rapid economic development, atmosphere polluting problem is further severe, the big compression ring of regionality of characteristic contamination
Border problem becomes increasingly conspicuous.Natural gas is a kind of clean energy resource, its main component is methane, generates carbon dioxide after methyl hydride combustion
And water, particle and sulphide staining is substantially not present.If but natural gas burns in a traditional way, extreme temperatures, can largely generate
Heating power nitrogen oxides (NOx) is with flue gas emission into atmospheric environment.The ingredient of NOx is with NO and NO2Based on.NO in an atmosphere can be into
One step is oxidized to NO2.NOx has significant impact to environment and health of human body, it can form nitric acid and nitre in atmospheric environment
Hydrochlorate particulate matter accelerates the acidification of regional acid rain and soil.In addition, NOx is also the arch-criminal to form photochemical fog
One of.
The NOx annual emissions of China have occupied first place in the world.Beijing has promulgated " boiler Air Pollutant Emission within 2015
Standard " (DB11/139-2015), it is desirable that before on April 1st, 2017 with the NOx emission of gas furnace by existing 150mg/m3Drop
To 80mg/m3Hereinafter, and mandatory provisions, the NOx emission of all newly-built gas furnaces should be lower than 30mg/m from April 1st, 20173.Mesh
It is preceding with gas furnace level of NOx emission generally in 100~200mg/m3, therefore existing almost all gas furnace all suffer from do it is low
The situation of nitrogen discharged transformation.The senior general of the market demand of NOx abatement is unthinkable.
Realize that the low-nitrogen discharged technological approaches of gas furnace mainly there are two: gas denitrifying technology after burning and aflame
Low NOx generates control technology.The former complex technical process, cost is quite high, and latter techniques' content is high, and cost is relatively low.In burning
Low nitrogen generate control there is also a variety of methods for having certain effect, such as Researched of Air Staging Combustion Burning Pulverized Coal, flue gas recirculating technique etc. belongs to
In mature technology, largely used in the practical application of various industrial furnaces.However, as environmental problem and limit row refer to
Target is increasingly strict, it is necessary to research and develop a kind of more efficiently combustion gas method for reducing gas furnace NOx emission.
Summary of the invention
To solve the above-mentioned problems, present inventor has performed sharp studies, provide one kind and gas furnace NOx row is effectively reduced
The combustion gas method put carries out warming and humidifying to the combustion air before entering combustion system by heating humidification system, can facilitate
Ignition temperature is controlled and is only generating the threshold value of few NOx hereinafter, in source the control of the production quantity of NOx minimum by ground, from
And complete the present invention.
The purpose of the present invention is to provide a kind of combustion gas method that gas furnace NOx emission is effectively reduced, the combustion gas methods
Including carrying out warming and humidifying processing to the combustion air before entering combustion system by heating humidification system；Combustion-supporting sky after processing
Gas enters combustion system and is reacted.The heating humidification system includes stokehold spray column, and the combustion air is through entering stokehold
Tower bottom is sprayed, and from water reverse heat-exchange that stokehold spray column top spray gets off and after humidifying, through stokehold spray column top
Air outlet slit outflow, into combustion system.
A kind of combustion gas method that gas furnace NOx emission is effectively reduced provided through the invention, can achieve following technology
Effect:
1, burner and provided by the invention emission reduction using existing resistance to high humility lower to combustion system calls of the invention
Method can reach requirement discharge index, save improvement of manufacturing line cost；
2, the high-intensitive humidification never having in the past provided with the progress of stokehold spray column, it is warm to inhibit to burn in furnace with this
Degree, thus achieve the purpose that from generate NOx source emission reduction, it is simple and effective, this in the past be widely used and it is mature " classification
The technologies such as burning ", " flue gas recirculation " are completely different；
3, heat exchanger is set after combustion system, and using spray column after furnace and the reverse direct contact heat transfer of flue gas and is removed
It is wet, realize that final exhaust gas temperature reaches close to environment temperature, this causes the thermal efficiency of combustion system (with the low heat valve of fuel
When calculating) it can be close to even more than 100%；
4, a spray column is respectively set before and after combustion system, and the shower water of two spray columns is existed by two circulating pumps
The flow circuit that closure is constituted between two spray columns realizes recycling for thermal energy and water resource, has saved cost；
5, this method is that can take into account the advanced combustion gas of two aspect technical indicator of pollutant emission control and the superelevation thermal efficiency
Scheme is the comprehensive integrated technology of cleaning burning and low pollution emission.
Detailed description of the invention
Fig. 1 shows the gas burning system schematic diagram that gas furnace NOx emission is effectively reduced in a kind of preferred embodiment of the present invention.
Drawing reference numeral explanation:
The stokehold 1- spray column；
2- spray thrower；
3- filler；
4- circulating pump；
Spray column after 5- furnace；
6- spray thrower；
7- filler；
8- air blower；
9- burner；
10- combustion gas furnace body；
11- heat exchanger.
Specific embodiment
Present invention will now be described in detail, and the features and advantages of the invention will become more with these explanations
It is clear, clear.
The purpose of the present invention is disclose a kind of combustion gas method that gas furnace discharged nitrous oxides are effectively reduced, the method packet
Include following steps:
1) warming and humidifying is carried out to the combustion air before entering combustion system by heating humidification system；
2) through step 1, treated that combustion air enters combustion system is reacted.
In the present invention, the heating humidification system includes stokehold spray column, and the combustion air enters stokehold spray column bottom
Portion, and sprays the water reverse heat-exchange to get off from the spray column top spray device of stokehold and humidifies, the sky through stokehold spray column top
Gas outlet outflow, into combustion system；
In a preferred embodiment, the combustion air is sent into stokehold by air blower and sprays tower bottom, to protect
Demonstrate,prove stable combustion air flow.
In further preferred embodiment, filler is equipped in the stokehold spray column, the fixed position of filler can be in furnace
Preceding spray column internal upper part, middle part, lower part or any position combination, for increasing the contact area of water and combustion air.It is described to fill out
Material includes regular type filler and dumped packing, and the filler is corrosion-resistant and high temperature resistant material, preferably stainless steel, ceramics and modeling
One of material is a variety of.
In the present invention, the temperature of shower water is 30 DEG C~70 DEG C, preferably 40 DEG C~60 DEG C in the spray column of stokehold；Heating adds
The temperature of combustion air is 30 DEG C~70 DEG C, 40 DEG C~60 DEG C preferably in bulk after wet；Humidity is steam-laden or supersaturation
State.It is ignition temperature that the key factor of amount of NOx size is generated when natural gas fuel system is burnt.Combustion air is not made to locate
Up to 1800 DEG C~1900 DEG C, the combustion air by stokehold spray column warming and humidifying to saturation state helps ignition temperature when reason
It controls in ignition temperature at 1400 DEG C~1523 DEG C or less of the threshold value for only generating few NOx.
In the present invention, the combustion system includes burner and combustion gas furnace body, the combustion-supporting sky of combustion gas and feeding burner
Gas mixing, and burnt in combustion gas furnace body internal combustion.Exhaust steam valve and drain valve are set in the combustion gas furnace body, is respectively used to control combustion gas
The condensed water that steam content and discharge generate after burning in furnace body.
Still contain a small amount of NOx, and stokehold in the flue gas that the combustion air of combustion gas and heating and moistening generates after being mixed and burned
The output of duration water and the recovery processing of water easily cause the increase of production cost in spray column, to further decrease NOx in flue gas
Content and water use processing cost, while Mist heat recovering, the combustion gas side for reducing gas furnace discharged nitrous oxides
Method further includes that flue gas will be by residual neat recovering system after burning, flue gas after burning is cooled down and be washed.
Residual neat recovering system includes spray column after the heat exchanger being connected with combustion gas furnace body and the furnace being connected with heat exchanger, cigarette
Gas passes through enter furnace after heat exchanger after spray column lower part, and carry out from spraying the water that gets off after furnace in spray column top spray device
The discharge at the top of spray column after furnace after counterflow heat exchange and dehumidification.
Heat exchanger tube is the finned tube of light pipe or pipe outer wall combination fin structure, preferably helical fin in the heat exchanger
Pipe, this structure can enable heat exchange pipe external surface to extend, and improve heat exchange area.Exchanger base is equipped with discharge pipe line, by flue gas
The condensed water discharge generated after cooling, sprays tower bottom after being preferably discharged into furnace.
Be equipped with filler after the furnace in spray column, the fixed position of filler can after furnace spray column internal upper part, middle part, lower part or
Any position combination, for increasing the contact area of water and flue gas.After the furnace in spray column shower water temperature be 30 DEG C~
50℃.After furnace spray column on the one hand make flue gas by with low temperature water direct contact heat-exchanging, flue-gas temperature is reduced to close to environment
Temperature, to ensure that the thermal efficiency of entire combustion system reaches high level；On the other hand, after furnace the shower water of spray column also to cigarette
Gas plays the role of sufficiently washing.Due to NOx and CO2There is certain solubility in water, the acid water that tower bottom can be accumulated
It focuses on and reuses, and various pollutants are no longer discharged into atmospheric environment.
It is inverse with air and flue gas progress respectively with the direct way of contact to pass through filler for spray column after stokehold spray column and furnace
Flow caloic exchange, heat and mass excellent.Showing as the exchange of this caloic, that terminal may be implemented is almost " zero temperature difference " and opposite
Humidity reaches saturation, i.e., in the spray column of stokehold, the air after heating reach with shower water very close to or almost the same temperature,
Humidity reaches the saturation state under relevant temperature；Equally after furnace in spray column, flue gas is also cooled to be tapped with shower water ten
Close temperature, and exhaust steam moisture is also the saturation state under corresponding lower temperature.
In the present invention, spray tower bottom is equipped with water tank after the stokehold spray tower bottom and furnace, and determines in water tank
Overflow valve is set at height, it is preferable that the water tank inner surface preservative treatment enhances the erosion resistance of water tank.
The water tank of stokehold spray tower bottom is connected to form cold water pipeline by the spray thrower at the top of spray column after pipeline and furnace, sprays after furnace
The spray thrower for drenching top of tower is connected to form hot water line by the water tank of pipeline and preceding spray tower bottom, sets respectively in two pipelines
Circulating pump is set, makes the water route composition closed circulation system of spray column after stokehold spray column and furnace, in addition the water of fuel gas buring generation,
Therefore other than blowdown, spray column water circulation system does not consume water resource substantially after stokehold spray column and furnace.
The present invention uses gas burning system combination water-moist steam circulatory system, drops in original burner or low NO
On the basis of low-nitrogen discharged, higher levels of low-nitrogen discharged index is realized；It is carried out simultaneously using water and flue gas by filler straight
The Mass and heat transfer of contact, and the heat recovery heat exchanger of gas furnace tail portion is combined, realize the thermal efficiency of superelevation.
In a preferred embodiment, a kind of gas burning system that gas furnace NOx emission is effectively reduced as shown in Figure 1,
Spray thrower 2 and filler 3 are installed, spray thrower 2 sprays after the piping connection to furnace by being connected with circulating pump 4 in stokehold spray column 1
Drench the water tank of 5 bottom of tower.Spray thrower 6 and filler 7 are equally installed, spray thrower 6 is by being connected with circulation after furnace in spray column 5
Pump 4 piping connection to 1 bottom of stokehold spray column water tank.Air blower 8 is arranged in 1 exterior bottom of stokehold spray column, will help
Combustion air brings stokehold spray column 1 into and carries out heat water-spraying.Saturated moist air after heat exchange is from the upper end of stokehold spray column 1
It is connected through air pipeline with burner 9, combustion gas mixes with the combustion air of feeding and in the combustion chamber internal combustion of combustion gas furnace body 10
It burns, furnace tubing, medium in pipe is made to reach the temperature of design.Flue gas in fuel chamber first flows through heat exchanger 11, the heat exchange
Device 11 is that fin tube type flue residue heat recycles heat exchanger, and part water vapour contained in flue gas coagulates in the process, cigarette
The part sensible heat and vapor latent heat of gas are tentatively recycled.Flue gas after preliminary cooling sprays after entering furnace by flue
Tower 5 has the function of washing flue gas, further simultaneously in the process with the heat exchange of low-temp. spraying water contact and dehumidification
Reduce the quantity to atmosphere discharge NOx and other various pernicious gases.Flue gas after cooling and dehumidification, finally with close to environment
The level of temperature, through the top outlet drain of spray column 5 after furnace into atmosphere.
It is described the invention in detail above in conjunction with detailed description and exemplary example, but these explanations are simultaneously
It is not considered as limiting the invention.It will be appreciated by those skilled in the art that without departing from the spirit and scope of the invention,
Can be with various equivalent substitutions, modifications or improvements are made to the technical scheme of the invention and its embodiments, these each fall within the present invention
In the range of.Scope of protection of the present invention is subject to the appended claims.
Claims (13)
1. a kind of combustion gas method for reducing gas furnace discharged nitrous oxides, the gas furnace includes combustion system and heating humidification system
System, which is characterized in that the method includes being carried out by the heating humidification system to the combustion air before entering combustion system
Warming and humidifying processing, combustion air after processing enter combustion system and are reacted；
The heating humidification system includes stokehold spray column；
The combustion air enter stokehold spray tower bottom, with the water reverse heat-exchange to get off from stokehold spray column top spray and add
It is wet, the air outlet slit outflow through stokehold spray column top, into combustion system；
Filler is equipped in the stokehold spray column, the fixed position of filler is in stokehold spray column internal upper part, middle part, lower part or any position
Set combination；
The temperature of combustion air is 30 DEG C~70 DEG C after warming and humidifying；Humidity is steam-laden or hypersaturated state.
2. the method according to claim 1, wherein the combustion air is sent into stokehold spray column by air blower
Bottom.
3. according to the method described in claim 2, it is characterized in that, the temperature of shower water is 30 DEG C~70 in the spray column of stokehold
℃；And/or
The temperature of combustion air is 40 DEG C~60 DEG C after warming and humidifying.
4. according to the method described in claim 3, it is characterized in that, the temperature of shower water is 40 DEG C~60 in the spray column of stokehold
℃。
5. the method according to claim 1, wherein the combustion system includes burner and combustion gas furnace body,
Combustion gas is mixed with the combustion air for being sent into burner, and is burnt in combustion gas furnace body internal combustion；
Exhaust steam valve and drain valve are equipped in the combustion gas furnace body.
6. method according to claim 1 to 4, which is characterized in that the method also includes flue gases after burning to lead to
Residual neat recovering system is crossed, cooled down to flue gas and is washed.
7. according to the method described in claim 6, it is characterized in that, residual neat recovering system includes heat exchanger and is connected with heat exchanger
Furnace after spray column, flue gas pass through heat exchanger after enter furnace after spray column lower part, with after furnace spray column top spray get off
Water carry out the discharge at the top of spray column after furnace after counterflow heat exchange and dehumidification.
8. the method according to the description of claim 7 is characterized in that heat exchanger tube is that light pipe or pipe outer wall combine in the heat exchanger
The finned tube of fin structure；And/or
Exchanger base is equipped with discharge pipe line, and the condensed water that flue gas generates after cooling is discharged.
9. according to the method described in claim 8, it is characterized in that, being sprayed after the condensed water that flue gas generates after cooling is discharged into furnace
Tower bottom.
10. the method according to the description of claim 7 is characterized in that filler, filler fixed bit are equipped with after the furnace in spray column
Set spray column internal upper part, middle part or lower part or any position combination after furnace；And/or
The temperature of shower water is 30 DEG C~50 DEG C in spray column after the furnace.
11. the method according to one of claim 7 to 10, which is characterized in that sprayed after the stokehold spray tower bottom and furnace
It drenches tower bottom and is equipped with water tank, and determined in water tank and overflow valve is set at height.
12. according to the method for claim 11, which is characterized in that the water tank inner surface does preservative treatment.
13. according to the method for claim 11, which is characterized in that the water tank that stokehold sprays tower bottom passes through pipeline and furnace
The spray thrower at the top of spray column is connected to form cold water pipeline afterwards, and the spray thrower after furnace at the top of spray column is sprayed by pipeline and stokehold
The water tank of tower bottom is connected to form hot water line, and circulating pump is respectively set in two pipelines, sprays after making stokehold spray column and furnace
The water route of tower constitutes closed circulation system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610503213 | 2016-06-30 | ||
| CN2016105032135 | 2016-06-30 |
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| CN107559875A CN107559875A (en) | 2018-01-09 |
| CN107559875B true CN107559875B (en) | 2019-05-03 |
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| CN201610622773.2A Active CN107559864B (en) | 2016-06-30 | 2016-08-02 | A kind of combustion gas method effectively improving combustion gas furnace thermal efficiency |
| CN201610622774.7A Pending CN107559873A (en) | 2016-06-30 | 2016-08-02 | A kind of ultralow discharged nitrous oxides superelevation thermal efficiency gas furnace system |
| CN201620827953.XU Active CN205979854U (en) | 2016-06-30 | 2016-08-02 | Super low nitrogen oxide discharges super high heat efficiency gas furnace system |
| CN201610622775.1A Active CN107559875B (en) | 2016-06-30 | 2016-08-02 | A kind of combustion gas method that gas furnace discharged nitrous oxides are effectively reduced |
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| CN201610622773.2A Active CN107559864B (en) | 2016-06-30 | 2016-08-02 | A kind of combustion gas method effectively improving combustion gas furnace thermal efficiency |
| CN201610622774.7A Pending CN107559873A (en) | 2016-06-30 | 2016-08-02 | A kind of ultralow discharged nitrous oxides superelevation thermal efficiency gas furnace system |
| CN201620827953.XU Active CN205979854U (en) | 2016-06-30 | 2016-08-02 | Super low nitrogen oxide discharges super high heat efficiency gas furnace system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107559864B (en) * | 2016-06-30 | 2019-05-03 | 保定市金能换热设备有限公司 | A kind of combustion gas method effectively improving combustion gas furnace thermal efficiency |
| 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 |
| CN115342551A (en) * | 2022-08-23 | 2022-11-15 | 北京建筑大学 | Direct-expansion heat pump type premixing and humidifying flue gas waste heat recovery and nitrogen reduction system |
| CN117006458A (en) * | 2023-09-18 | 2023-11-07 | 承德市生态环境局鹰手营子矿区分局 | Boiler flue gas waste heat recovery utilizes system of thermal power plant |
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- 2016-08-02 CN CN201610622773.2A patent/CN107559864B/en active Active
- 2016-08-02 CN CN201610622774.7A patent/CN107559873A/en active Pending
- 2016-08-02 CN CN201620827953.XU patent/CN205979854U/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107559864B (en) | 2019-05-03 |
| CN107559875A (en) | 2018-01-09 |
| CN205979854U (en) | 2017-02-22 |
| CN107559864A (en) | 2018-01-09 |
| CN107559873A (en) | 2018-01-09 |
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