CN206918999U - A kind of secondary air system based on flue gas recirculation - Google Patents
A kind of secondary air system based on flue gas recirculation Download PDFInfo
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- CN206918999U CN206918999U CN201720807353.1U CN201720807353U CN206918999U CN 206918999 U CN206918999 U CN 206918999U CN 201720807353 U CN201720807353 U CN 201720807353U CN 206918999 U CN206918999 U CN 206918999U
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- flue gas
- gas recirculation
- secondary air
- air system
- discharging pipe
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Abstract
Field of thermal power is the utility model is related to, specifically discloses a kind of secondary air system based on flue gas recirculation.The secondary air system based on flue gas recirculation, including smoke discharging pipe and overfire air jet, are provided with flue gas recirculation pipeline between described smoke discharging pipe and overfire air jet, described flue gas recirculation pipeline is provided with blower fan.The above-described secondary air system based on flue gas recirculation, substitutes existing secondary air system, while avoiding excess oxygen in boiler export flue gas, simplifies device structure, saves the energy.
Description
Technical field
It the utility model is related to field of thermal power, and in particular to a kind of secondary air system based on flue gas recirculation.
Background technology
In thermal power plant, primary air system and secondary air system are typically provided with around boiler, First air is mainly used in
Conveying fuel enters boiler, and provides oxygen for the combustion reaction in boiler；Secondary Air is mainly used in disturbing the air-flow in boiler,
So that the combustion reaction in boiler is more abundant, heat is more evenly distributed；And when First air oxygen supply is insufficient, it can aid in providing combustion
Partial oxidation needed for burning.
Secondary air system in existing steam generator system is generally arranged in boiler room, and air is extracted and by steaming by blower fan
After vapour preheater is heated to suitable temperature, corresponding overfire air jet on boiler is passed through, hence into burner hearth.This mode has
Some deficiency below：
1. in order to ensure the ignition temperature in boiler, Secondary Air needs to set preheater to be added before burner hearth is entered
Heat, system it is complicated, and waste the energy.
2. because the oxygen required for boiler combustion is mainly provided by First air, the oxygen that Secondary Air brings burner hearth into can be big
Amount wastes；Particularly in waste incineration and generating electricity system, due to the complicated variety of house refuse composition, oxygen demand during burning
Fluctuate it is larger, this result in boiler export flue gas oxygen content fluctuation it is very big, up to more than 13% when high.
The content of the invention
The technical problems to be solved in the utility model is to provide a kind of secondary air system based on flue gas recirculation, substitutes existing
Some secondary air systems, while avoiding excess oxygen in boiler export flue gas, simplify device structure, save the energy.
In order to solve the above-mentioned technical problem, the technical scheme that the utility model is provided is as follows：One kind is based on flue gas recirculation
Secondary air system, including smoke discharging pipe and overfire air jet are provided with flue gas between described smoke discharging pipe and overfire air jet
Recirculating line, described flue gas recirculation pipeline are provided with blower fan.
It is provided with flue gas recirculation pipeline between described smoke discharging pipe and overfire air jet, the flue gas in smoke discharging pipe is by portion
Divide and extract out, be back to as Secondary Air in burner hearth.This scheme is ensuring effective disturbance burner hearth interior air-flow, the basis of auxiliary combustion
On, reduce the input quantity of oxygen, indirectly reduce the oxygen content in flue gas；And because the outlet temperature of flue gas is higher,
Need not move through preheating device to be heated, simplify device structure, reduce production cost.It is existing in order to meet environmental requirement
Boiler plant waste gas treatment equipment can be set in flue gas pipeline, the concentration of each pollutant is protected substantially in treated flue gas
Hold constant；Partial fume is extracted out and returns to burner hearth by flue gas recirculation pipeline, reduces the total emission volumn of flue gas, indirectly reduces
The discharge capacity of pollutant, be advantageous to the protection of environment.Described flue gas recirculation pipeline is provided with blower fan, and it is flue gas that blower fan, which is used for,
Backflow provides power.
Preferably, the position connection on described flue gas recirculation pipeline between blower fan and smoke discharging pipe is once
Wind branch pipe；Described First air branch pipe is provided with the first regulating valve.It is violent when being burnt in boiler, during oxygen demand increase, open the
One regulating valve, part First air is pumped into flue gas recirculation pipeline, and entered by flue gas recirculation pipeline in burner hearth, First air
Interior oxygen content is high, the oxygen needed for aftercombustion.According to the combustion position in burner hearth, the unlatching of the regulating valve of flexible modulation first
Amount, ensure it is clean-burning simultaneously, reduce flue gas in oxygen content.
Adjusted preferably, the position on described flue gas recirculation pipeline between blower fan and smoke discharging pipe is provided with second
Save valve.Second regulating valve is used to adjust the exhaust gas volumn for being back to burner hearth by flue gas recirculation pipeline.
Preferably, described First air branch pipe is between the second regulating valve and blower fan.
Preferably, the first described regulating valve and the second regulating valve are electric control valve, the opening and closing spirit of valve
It is living convenient, and opening degree can be controlled exactly.
Preferably, the sensor for being used for monitoring flue gas oxygen content is provided with described smoke discharging pipe.It is preferred that use oxidation
Zirconium sensor, what zirconia sensor can be very sensitive senses the oxygen content change in high flue gas, and the oxygen content in flue gas is anti-
Control system is fed to, control system controls the input quantity of First air in burner hearth, and the first regulation according to the flexible in size of oxygen content
The opening degree of valve and the second regulating valve, the amount of oxygen that regulation enters in burner hearth.
Brief description of the drawings
Fig. 1 is the structural representation of secondary air system of the present embodiment based on flue gas recirculation.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
Embodiment
As shown in figure 1, a kind of secondary air system based on flue gas recirculation, including smoke discharging pipe 3 and overfire air jet 10,
Flue gas recirculation pipeline 4 is provided between described smoke discharging pipe 3 and overfire air jet 10, on described flue gas recirculation pipeline 4
Blower fan 5 provided with auxiliary smoke backflow.Flue gas in smoke discharging pipe 3 is partially withdrawn, and is back to as Secondary Air in burner hearth.This
Kind of scheme is ensuring effective disturbance burner hearth interior air-flow, on the basis of auxiliary combustion, reduces the input quantity of oxygen, indirect to reduce
Oxygen content in flue gas；And because the outlet temperature of flue gas is higher, it is not necessary to heated, simplified by preheating device
Device structure, reduce production cost.In order to meet environmental requirement, the existing equipment of boiler 1 can set waste gas in flue gas pipeline
Processing equipment, the concentration of each pollutant is held essentially constant in treated flue gas；Flue gas recirculation pipeline 4 is by partial fume
Extract out and return to burner hearth, reduce the total emission volumn of flue gas, indirectly reduce the discharge capacity of pollutant, be advantageous to the guarantor of environment
Shield.
Further, the position on described flue gas recirculation pipeline 4 between blower fan 5 and smoke discharging pipe 3 is connected with
First air branch pipe 8；Described First air branch pipe 8 is provided with the first regulating valve 9.When burning is violent in boiler 1, oxygen demand increases
When, the first regulating valve 9 is opened, part First air is extracted out from primary air system 7 and is sent into flue gas recirculation pipeline 4, and passes through cigarette
Gas recirculating line 4 enters in burner hearth, and oxygen content is high in First air, the oxygen needed for aftercombustion.According to the burning in burner hearth
Situation, the open amount of the first regulating valve of flexible modulation 9, ensure it is clean-burning simultaneously, reduce flue gas in oxygen content.It is described
Flue gas recirculation pipeline 4 on position between blower fan 5 and smoke discharging pipe 3 be provided with the second regulating valve 6.Second regulating valve 6
The exhaust gas volumn of burner hearth is back to by flue gas recirculation pipeline 4 for adjusting.Described First air branch pipe 8 is located at the second regulating valve
Between 6 and blower fan 5.Described the first regulating valve 9 and the second regulating valve 6 is electric control valve, and the opening and closing of valve are flexible
It is convenient, and opening degree can be controlled exactly.
Further, the sensor 2 for being used for monitoring flue gas oxygen content is provided with described smoke discharging pipe 3, is preferably used
Zirconia sensor, what zirconia sensor can be very sensitive senses the oxygen content change in high flue gas, and will be oxygen-containing in flue gas
Amount feeds back to control system, and control system controls the input quantity of First air in burner hearth, and first according to the flexible in size of oxygen content
The opening degree of the regulating valve 6 of regulating valve 9 and second, the amount of oxygen that regulation enters in burner hearth.
The above-described secondary air system based on flue gas recirculation, substitutes existing secondary air system, avoids boiler from going out
In mouth flue gas while excess oxygen, simplify device structure, save the energy.
In a word, preferred embodiment of the present utility model is the foregoing is only, it is all not to limit the utility model
Made within spirit of the present utility model and principle all any modification, equivalent and improvement etc., should be included in this practicality
Within new protection domain.
Claims (6)
1. a kind of secondary air system based on flue gas recirculation, including smoke discharging pipe（3）And overfire air jet（10）, its feature exists
In：Described smoke discharging pipe（3）With overfire air jet（10）Between be provided with flue gas recirculation pipeline（4）, described flue gas follows again
Endless tube road（4）It is provided with blower fan（5）.
2. the secondary air system according to claim 1 based on flue gas recirculation, it is characterised in that：Described flue gas follows again
Endless tube road（4）It is upper to be located at blower fan（5）And smoke discharging pipe（3）Between position be connected with First air branch pipe（8）；Described First air
Branch pipe（8）It is provided with the first regulating valve（9）.
3. the secondary air system according to claim 2 based on flue gas recirculation, it is characterised in that：Described flue gas follows again
Endless tube road（4）It is upper to be located at blower fan（5）And smoke discharging pipe（3）Between position be provided with the second regulating valve（6）.
4. the secondary air system according to claim 3 based on flue gas recirculation, it is characterised in that：Described First air branch
Pipe（8）Positioned at the second regulating valve（6）And blower fan（5）Between.
5. the secondary air system according to claim 4 based on flue gas recirculation, it is characterised in that：The first described regulation
Valve（9）With the second regulating valve（6）For electric control valve.
6. the secondary air system based on flue gas recirculation according to any one of claim 1-5, it is characterised in that：It is described
Smoke discharging pipe（3）It is interior to be provided with the sensor for being used for monitoring flue gas oxygen content（2）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720807353.1U CN206918999U (en) | 2017-07-05 | 2017-07-05 | A kind of secondary air system based on flue gas recirculation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720807353.1U CN206918999U (en) | 2017-07-05 | 2017-07-05 | A kind of secondary air system based on flue gas recirculation |
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| Publication Number | Publication Date |
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| CN206918999U true CN206918999U (en) | 2018-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720807353.1U Active CN206918999U (en) | 2017-07-05 | 2017-07-05 | A kind of secondary air system based on flue gas recirculation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631044A (en) * | 2018-12-19 | 2019-04-16 | 曲靖云能投新能源发电有限公司 | A kind of refuse incinerator of circulating fluid bed and its incinerating method |
| CN111174197A (en) * | 2020-01-14 | 2020-05-19 | 湖南文理学院 | Method for detecting and controlling oxygen content of boiler flue gas of power plant |
-
2017
- 2017-07-05 CN CN201720807353.1U patent/CN206918999U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631044A (en) * | 2018-12-19 | 2019-04-16 | 曲靖云能投新能源发电有限公司 | A kind of refuse incinerator of circulating fluid bed and its incinerating method |
| CN111174197A (en) * | 2020-01-14 | 2020-05-19 | 湖南文理学院 | Method for detecting and controlling oxygen content of boiler flue gas of power plant |
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