CN208282090U - Gas fired-boiler flue gas recirculation humidifies low nitrogen system - Google Patents
Gas fired-boiler flue gas recirculation humidifies low nitrogen system Download PDFInfo
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- CN208282090U CN208282090U CN201820863680.3U CN201820863680U CN208282090U CN 208282090 U CN208282090 U CN 208282090U CN 201820863680 U CN201820863680 U CN 201820863680U CN 208282090 U CN208282090 U CN 208282090U
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- preheater
- flue gas
- pipeline
- gas
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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 utility model discloses a kind of gas fired-boiler flue gas recirculation and humidifies low nitrogen system, it mainly include air wetting preheater, water booster pump, exhaust fan, air pipeline, circulating flue gas pipeline and mixed gas pipeline, it is characterized by: air wetting preheater is fin tube type gas-to-gas heat exchanger, enclosure interior is equipped with water atomizer(-iser) and Duo Gen finned tube；The water atomizer(-iser) is located at the shell side air intlet of air wetting preheater, and the water inlet pipe of water atomizer(-iser) is connected to gas fired-boiler water inlet pipe, and water booster pump is installed in connecting pipe；A circulating flue gas pipeline is connect on the smoke exhaust pipe of air wetting preheater, and is connect with the air pipeline of air wetting preheater shell-side outlet, and the two merges into mixed gas pipeline, and exhaust fan is installed in mixed gas pipeline.When operation, air is first humidified and is heated through air wetting preheater, then is entered burner through mixed gas pipeline with circulating flue gas and participated in burning.The flue gas recirculation humidifies that low nitrogen system is simple and easy to do, and low nitrogen effect is good.
Description
Technical field
The utility model relates to gas fired-boiler technical field, in particular to a kind of gas fired-boiler flue gas recirculation humidifies low nitrogen
System.
Background technique
Gas fired-boiler is widely used in industrial production and resident's heat supply etc. mainly using natural gas as fuel.With China's ring
Guaranteed request is higher and higher, requires the discharged nitrous oxides limitation of gas fired-boiler also higher and higher.Beijing, Shanghai, Zhengzhou at present
Equal cities, it is desirable that newly-built gas fired-boiler nitrogen oxide emission is lower than 30mg/Nm3.Air (combustion gas) classification, flue gas recirculation,
The single low-NO_x combustion technology such as bias combustion is no longer satisfied the requirement of current low-nitrogen discharged policy.Flue gas recirculating technique energy
Enough it is effectively reduced the generation of nitrogen oxides, but with the increase of amount of circulating gas, the oxygen concentration in air is constantly diluted, and is easy
Cause the unstable of flame combustion, influences the normal operation of boiler.Currently need to add the flue gas recirculating technique of gas fired-boiler
To improve, good low nitrogen effect can be reached in the case where less amount of circulating gas.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of gas fired-boiler flue gas recirculation humidification
Low nitrogen system to reduce the discharged nitrous oxides of gas fired-boiler, while improving the thermal efficiency of gas fired-boiler.
The technical solution of the utility model is: gas fired-boiler flue gas recirculation humidifies low nitrogen system, mainly adds including air
Wet preheater, water booster pump, exhaust fan, air pipeline, circulating flue gas pipeline and mixed gas pipeline, it is characterised in that: the sky
It is fin tube type gas-to-gas heat exchanger that gas, which humidifies preheater, is arranged in above the outlet flue of gas fired-boiler, and enclosure interior is equipped with
Water atomizer(-iser) and Duo Gen finned tube；The water atomizer(-iser) is located at the shell side combustion air inlet of air wetting preheater, water mist
The water inlet pipe for changing device is connected to the water inlet pipe of gas fired-boiler, and water booster pump is installed in connecting pipe；The finned tube is outer wing
Piece pipe, walks flue gas in pipe, pipe it is outer walk combustion air, two media flows in the shell of air wetting preheater in interleaved fly-back
And heat exchange；A circulating flue gas pipeline is connect on the smoke exhaust pipe of air wetting preheater, and is gone out with air wetting preheater shell side
The air pipeline connection of mouth, the two merges into mixed gas pipeline, exhaust fan is installed in mixed gas pipeline, in circulating flue gas pipeline
With regulating valve and flowmeter are separately installed on air pipeline；Circulating flue gas and combustion air pass through exhaust fan through mixed gas pipeline
It is connected with the air inlet of combustor of boiler.
One or more, the multiple sprays of each water atomizer(-iser) setting are arranged according to the size of air wetting amount for the water atomizer(-iser)
Head.
The shell structure of the air wetting preheater is cuboid, the finned tube in the housing using vertical arrangement and
It is staggered, the upper and lower ends of shell is provided with bobbin carriage, are provided with partition in bobbin carriage.
Compared with prior art, the utility model has the beneficial effects that first is that gas fired-boiler flue gas recirculation humidifies low nitrogen
For system by flue gas recirculating technique and the combination for adding water or vapor technology into burner hearth, the water or vapor of addition are advantageous
In reducing ignition temperature, required amount of circulating gas, the stability of strengthen burning, low nitrogen effect can be reduced under same operating condition
More preferably；Second is that the water mist sprayed using the high-temperature flue gas heating air and water atomizer(-iser) of boiler tail discharge, rises water mist heat absorption
Temperature becomes vapor, and enters mixed gas pipeline together with hot-air, is sent into burner hearth through exhaust fan and participates in combustion process, prevents
Vapor condenses in mixed gas pipeline and burner, to avoid causing to corrode to pipeline and burner；Third is that air wetting
Preheater had not only been used as air heater but also had been used as humidifier, optimized the structure of equipment, and reduced the smoke evacuation temperature of gas fired-boiler
Degree, improves the thermal efficiency of boiler；Fourth is that the low nitrogen system structure of gas fired-boiler flue gas recirculation humidification is simple, be conducive to equipment
Manufacture, transport and installation, have good low nitrogen effect, while improving the thermal efficiency of boiler again, are more energy-saving and environmentally friendly.
Detailed description of the invention
Fig. 1 is that gas fired-boiler flue gas recirculation humidifies low nitrogen system schematic diagram.
Appended drawing reference, 1- burner；2- gas fired-boiler；3- air wetting preheater；4- water atomizer(-iser)；5- air pipeline；
6- regulating valve；7- finned tube；8- smoke discharging pipe；9- flowmeter；10- circulating flue gas pipeline；11- water booster pump；12- mixture pipe
Road；13- exhaust fan.
Specific embodiment
The present invention will be further described for explanation with reference to the accompanying drawing.
The air wetting preheater of dimension is set above boiler flue gas outlet according to gas fired-boiler model, and air adds
Wet preheater is gas-gas heat exchange tube fin formula structure, installs one according to the size of air wetting amount at its shell side air intlet
Or multiple water atomizer(-iser)s, the water inlet pipe of the water inlet pipe connection gas fired-boiler of water atomizer(-iser), and it is provided by it water source, air wetting is pre-
The shell side inlet and outlet connection air pipeline of hot device, tube side inlet and outlet connect the smoke discharging pipe of boiler.
In comburent air duct and circulating flue gas Pipe installing flowmeter and regulating valve, to monitor and adjust combustion air
With the size of amount of circulating gas, circulating flue gas pipeline is connected with the air pipeline by air wetting preheater and merges into mixing
Feed channel installs exhaust fan in mixed gas pipeline, provides power for air and circulating flue gas, mixed gas pipeline and burner into
Air port is connected.
When gas-fired Boiler System is run, normally start under no circulating flue gas state first, unlatching air pipeline regulating valve,
Exhaust fan and burner open the regulating valve of circulating flue gas pipeline again after boiler operatiopn is stablized, open simultaneously water atomizer(-iser), this
When boiler system operating status are as follows: air initially enters air wetting preheater under exhaust fan effect, in water atomizer(-iser) and
The humidified heating of air under the action of high-temperature flue gas, air and circulating flue gas after humidification heating are mixed into mixed gas pipeline,
It makes a gift to someone burner through exhaust fan, participates in the combustion process in burner hearth.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (3)
1. gas fired-boiler flue gas recirculation humidifies low nitrogen system, mainly include air wetting preheater, water booster pump, exhaust fan,
Air pipeline, circulating flue gas pipeline and mixed gas pipeline, it is characterised in that: the air wetting preheater is fin tube type gas-
Gas heat exchanger, is arranged in above the outlet flue of gas fired-boiler, and enclosure interior is equipped with water atomizer(-iser) and Duo Gen finned tube；It is described
Water atomizer(-iser) is located at the shell side combustion air inlet of air wetting preheater, and the water inlet pipe of water atomizer(-iser) is connected to gas fired-boiler
Water inlet pipe, in connecting pipe install water booster pump；The finned tube is external finned tube, and flue gas is walked in pipe, is walked outside pipe combustion-supporting
Air, two media are flowed and are exchanged heat in interleaved fly-back in the shell of air wetting preheater；In air wetting preheater
A circulating flue gas pipeline is connect on smoke exhaust pipe, and is connect with the air pipeline of air wetting preheater shell-side outlet, and the two merges
For mixed gas pipeline, exhaust fan is installed in mixed gas pipeline, tune is separately installed on circulating flue gas pipeline and air pipeline
Save valve and flowmeter；Circulating flue gas and combustion air pass through air inlet of combustor phase of the exhaust fan through mixed gas pipeline with boiler
Even.
2. gas fired-boiler flue gas recirculation according to claim 1 humidifies low nitrogen system, which is characterized in that the water atomization
One or more, the multiple spray heads of each water atomizer(-iser) setting are arranged according to the size of air wetting amount for device.
3. gas fired-boiler flue gas recirculation according to claim 1 humidifies low nitrogen system, which is characterized in that the air adds
The shell structure of wet preheater is cuboid, and the finned tube is in the housing using arranging and being staggered vertically, in shell
Upper and lower ends are provided with bobbin carriage, are provided with partition in bobbin carriage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820863680.3U CN208282090U (en) | 2018-06-05 | 2018-06-05 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820863680.3U CN208282090U (en) | 2018-06-05 | 2018-06-05 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
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| CN208282090U true CN208282090U (en) | 2018-12-25 |
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| CN201820863680.3U Active CN208282090U (en) | 2018-06-05 | 2018-06-05 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613173A (en) * | 2018-06-05 | 2018-10-02 | 郑州大学 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
-
2018
- 2018-06-05 CN CN201820863680.3U patent/CN208282090U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108613173A (en) * | 2018-06-05 | 2018-10-02 | 郑州大学 | Gas fired-boiler flue gas recirculation humidifies low nitrogen system |
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