CN208382135U - A kind of low nitrogen system of flue gas recirculation - Google Patents
A kind of low nitrogen system of flue gas recirculation Download PDFInfo
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- CN208382135U CN208382135U CN201820214404.4U CN201820214404U CN208382135U CN 208382135 U CN208382135 U CN 208382135U CN 201820214404 U CN201820214404 U CN 201820214404U CN 208382135 U CN208382135 U CN 208382135U
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- flue gas
- mixing tank
- blower
- bypass circuit
- air
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Abstract
A kind of low nitrogen system of flue gas recirculation, purpose will provide the low nitrogen system for the flue gas recirculation that structure is simple, scrap build is with low investment, belong to boiler and drop drainage technique field.It is characterized by: back-end ductwork is equipped with bypass circuit fume pipe, flue gas successively enters flue gas mixing tank through hand-operated valve, gas recirculating fan and circulating flue gas air door in bypass circuit fume pipe；Air intlet is connect with blower export in flue gas mixing tank, carries out combustion-supporting burning in mixed gas outlet feeding burner, boiler furnace.Good effect is: having system simple, the reconstruction scope is small, in the insufficient situation of air blower allowance, by increasing recirculation blower, flue gas recycled is guided in flue gas mixing tank, no replacement is required boiler blower, investment cost is small: flue gas recycled reduces the ignition temperature of fuel because oxygen content is low, and then reduces the generation of thermal NO and fuel NO, have many advantages, such as that low nitrogen effect is good, has a wide range of application.
Description
Technical field
It is low more particularly to flue gas recirculation is used the utility model relates to a kind of high heating value gas fired-boiler, oil burning boiler
Nitrogen technology reduces the NOx emission of gas/oil-fired boiler, belongs to boiler and drops drainage technique field.
Background technique
Along with the high speed development of China's economic, environmental problem is increasingly highlighted, and is faced with increasingly severe environment pressure
Power, national environmental protection policy and dynamics are increasingly strict, and boiler air pollution emission standard is also received sternly increasingly, and Beijing area has been carried out
NOx emission limit value is 30mg/Nm3Most stringent of environmental standard.
Flue gas recirculating technique is a kind of low-NO_x combustion technology for reducing discharged nitrous oxides, because it is reducing flame temperature
While the flue gas that also reduces in oxygen content, it is possible to effectively inhibit thermal NO and fuel NO
It generates, the efficiency for reducing nitrogen oxides is up to 30~70%, is widely used in the low nitrogen burning transformation of fuel.
For current most of flue gas recirculating techniques in actual application, majority is all that one is drawn at boiler back end ductwork
Circulating flue gas is guided to the flue gas mixing tank at blower inlet, mixes with air it by partial fume by flue gas recirculation pipe
Afterwards, then by the draft of air blower flue gas recycled extraction is delivered to subsequent boiler system.In this flue gas recirculation system
In, it because increasing the ventilation quantity of air blower, can be applied to that former air blower configuration is larger, there is the low nitrogen transformation boiler of enough allowances
In.But if the draught margin of the matched air blower of former boiler is insufficient, this method just cannot be directly applicable in, and must replace air blower,
But for big tonnage boiler, air blower is replaced there is costs huge, the problems such as installation is complicated.
Summary of the invention
For above-mentioned defect existing in the prior art, the utility model provides that a kind of system is simple, the cigarette of strong applicability
Gas recycles low nitrogen system, in original insufficient situation of boiler system air blower draught margin, no replacement is required boiler blower,
Only original system need to slightly be improved.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of low nitrogen system of flue gas recirculation, including air blower, flue gas mixing tank, burner, boiler furnace, tail portion cigarette
Road and chimney, it is characterised in that；
The blower export, flue gas mixing tank, burner, boiler furnace, back-end ductwork and chimney, successively front and rear pipes
Connection communicates；The back-end ductwork is equipped with bypass circuit fume pipe, and the bypass circuit fume pipe other end and the flue gas are mixed
The connection of mould assembling gas inlet pipeline；The bypass circuit fume pipe is also equipped with hand-operated valve, gas recirculating fan and circulating flue gas
Air door, flue gas is successively through the hand-operated valve, the gas recirculating fan and the circulation cigarette in the bypass circuit fume pipe
Gas air door enters the flue gas mixing tank；It is additionally provided with air intlet and mixed gas outlet in the flue gas mixing tank, it is described
The air intlet of flue gas mixing tank is connect with blower exit conduits to be communicated, the flue gas mixing tank mixed gas outlet and subsequent wind
Road is connected, and is ultimately delivered to burner, carries out combustion-supporting burning in boiler furnace.
The good effect of the utility model is: a kind of low nitrogen system of Novel flue gas recycling has system simple, change
The advantages that range is small, has a wide range of application.In the insufficient situation of air blower allowance, by increasing recirculation blower, it will recycle
Flue gas is guided in flue gas mixing tank, does not increase the ventilation quantity of air blower, no replacement is required boiler blower, and investment cost is small: following again
Ring flue gas is not involved in burning because oxygen content is low, reduces the ignition temperature of fuel, manufactures reproducibility atmosphere, and then reduce heating power
The generation of type nitrogen oxides and fuel NO, low nitrogen effect are good.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment；
1- hand-operated valve；2- gas recirculating fan；3- circulating flue gas air door；4- flue gas mixing tank；5- air blower；
6- burner；7- boiler furnace；8- chimney；9- bypass circuit fume pipe；10- bypass circuit fume pipe one；11- bypass
Circulating flue gas pipe two；12- fan outlet air duct；13- back-end ductwork；14- air intlet；15- gas inlet；16- is mixed
Close gas vent.
Specific embodiment
The embodiments of the present invention are described in further detail below in conjunction with Detailed description of the invention, but the present embodiment and are not had to
In limitation the utility model, all similar structures and its similar variation using the utility model should all be included in the utility model
Protection scope, the pause mark in the utility model indicates the relationship of sum.
A kind of low nitrogen system of flue gas recirculation, including air blower 5, flue gas mixing tank 4, burner 6, boiler furnace 7, tail
Portion's flue 13 and chimney 8, it is characterised in that:
The outlet of air blower 5 12, flue gas mixing tank 4, burner 6, boiler furnace 7, back-end ductwork 13 and chimney 8, according to
Secondary front and rear pipes connection communicates；The back-end ductwork 13 is equipped with bypass circuit fume pipe 9(10), the bypass circuit fume pipe 9
The other end 11 be connected to 4 gas inlet of flue gas mixing tank, 15 pipeline；The bypass circuit fume pipe 9 is also equipped with hand-operated valve
1, gas recirculating fan 2 and circulating flue gas air door 3, flue gas is successively through the hand-operated valve 1, institute in the bypass circuit fume pipe
It states gas recirculating fan 2 and the circulating flue gas air door 3 enters the flue gas mixing tank 4；It is also set in the flue gas mixing tank 4
It is equipped with air intlet 14 and mixed gas outlet 16, the air intlet 14 and 12 pipeline of blower export of the flue gas mixing tank connect
It connects and communicates, 4 mixed gas outlet 16 of flue gas mixing tank is connected with subsequent air duct, is ultimately delivered to burner 6, in boiler furnace 7
Carry out combustion-supporting burning.
Bypass circuit fume pipe 9 is made of bypass circuit fume pipe 1 and 2 11 two parts of bypass circuit fume pipe, and two
Person is connected by gas recirculating fan 2, and wherein bypass circuit fume pipe 1 is the flue gas inlet tube of gas recirculating fan 2
Road, bypass circuit fume pipe 1 take air port to be located in back-end ductwork 13, manually-operated gate 1 are equipped on pipeline, it can be achieved that flue gas
Cutting between recirculating system and original boiler flue system；Bypass circuit fume pipe 2 11 is gas recirculating fan 2
Exhanst gas outlet pipeline is equipped with circulating flue gas air door 3 on pipeline, and bypass circuit fume pipe 2 11 is connected to the flue gas of flue gas mixing tank 4
Import 15.
The gas recirculating fan 2 and adjustment type air door 3 are with the use of common adjusting flue gas recycled amount, air blower 5
Air capacity is adjusted, and then controls the ratio for entering flue gas and air in flue gas mixing tank 4, realizes accurate control.
Air pipe line in the utility model, under the power effect of air blower 5, fresh air passes through flue gas mixing tank 3
Air intlet enters flue gas mixing tank 4；Flue gas recycled by gas recirculating fan 2 overcome flue gas negative pressure, flue resistance,
Chimney pull out force, blower export positive pressure, flue gas recycled are extracted from flue, are bypassed flue gas recirculation pipe 9 and sent to being placed in drum
In flue gas mixing tank 4 at fan outlet, flue gas recycled and fresh air are after flue gas mixing tank 4 is sufficiently mixed, gaseous mixture
It is sent into burner hearth 6 and burns eventually by burner 5 through subsequent air duct, realize the purpose for reducing NOx emission.
Claims (1)
1. a kind of low nitrogen system of flue gas recirculation, including air blower, flue gas mixing tank, burner, boiler furnace, back-end ductwork
And chimney, it is characterised in that:
The blower export, flue gas mixing tank, burner, boiler furnace, back-end ductwork and chimney, successively front and rear pipes connect
It communicates；The back-end ductwork is equipped with bypass circuit fume pipe, the bypass circuit fume pipe other end and the flue gas mixing tank
The connection of gas inlet pipeline；The bypass circuit fume pipe is also equipped with hand-operated valve, gas recirculating fan and circulating flue gas air door,
Flue gas is successively through the hand-operated valve, the gas recirculating fan and the circulating flue gas air door in the bypass circuit fume pipe
Into the flue gas mixing tank；Air intlet and mixed gas outlet are additionally provided in the flue gas mixing tank, the flue gas is mixed
The air intlet of mould assembling is connect with blower exit conduits to be communicated, the flue gas mixing tank mixed gas outlet and subsequent air duct phase
Even, it is ultimately delivered to burner, carries out combustion-supporting burning in boiler furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214404.4U CN208382135U (en) | 2018-02-07 | 2018-02-07 | A kind of low nitrogen system of flue gas recirculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820214404.4U CN208382135U (en) | 2018-02-07 | 2018-02-07 | A kind of low nitrogen system of flue gas recirculation |
Publications (1)
| Publication Number | Publication Date |
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| CN208382135U true CN208382135U (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820214404.4U Active CN208382135U (en) | 2018-02-07 | 2018-02-07 | A kind of low nitrogen system of flue gas recirculation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686231A (en) * | 2019-10-12 | 2020-01-14 | 北京金茂绿建科技有限公司 | Thermal power plant peak regulation system based on hydrogen production by water electrolysis |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN112984486A (en) * | 2021-02-26 | 2021-06-18 | 西安西热锅炉环保工程有限公司 | Energy-saving and emission-reducing system and method for small and medium-sized natural gas boilers |
| CN113587066A (en) * | 2021-08-10 | 2021-11-02 | 岳阳恒盛石化科技有限公司 | Combustion control device and method for gas-fired boiler |
-
2018
- 2018-02-07 CN CN201820214404.4U patent/CN208382135U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686231A (en) * | 2019-10-12 | 2020-01-14 | 北京金茂绿建科技有限公司 | Thermal power plant peak regulation system based on hydrogen production by water electrolysis |
| CN111380049A (en) * | 2019-11-27 | 2020-07-07 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN111380049B (en) * | 2019-11-27 | 2022-05-27 | 湖北中烟工业有限责任公司 | Boiler low-nitrogen discharge system |
| CN112984486A (en) * | 2021-02-26 | 2021-06-18 | 西安西热锅炉环保工程有限公司 | Energy-saving and emission-reducing system and method for small and medium-sized natural gas boilers |
| CN113587066A (en) * | 2021-08-10 | 2021-11-02 | 岳阳恒盛石化科技有限公司 | Combustion control device and method for gas-fired boiler |
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