CN210069842U - Low-nitrogen combustion control device of gas boiler - Google Patents
Low-nitrogen combustion control device of gas boiler Download PDFInfo
- Publication number
- CN210069842U CN210069842U CN201920438995.8U CN201920438995U CN210069842U CN 210069842 U CN210069842 U CN 210069842U CN 201920438995 U CN201920438995 U CN 201920438995U CN 210069842 U CN210069842 U CN 210069842U
- Authority
- CN
- China
- Prior art keywords
- flue gas
- steam
- nitrogen combustion
- low
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses a gas boiler low nitrogen combustion control device, include: the gas boiler comprises a burner and a hearth; and a low nitrogen combustion device, low nitrogen combustion device has a flue gas inlet, an air intlet and a steam inlet, low nitrogen combustion device includes a flue gas circulating line, an air conduit and a steam conduit, wherein flue gas circulating line's one end intercommunication flue gas inlet is in order to follow gas boiler smoke exhaust department acquires the flue gas, low nitrogen combustion device still includes an draught fan, the draught fan intercommunication low nitrogen combustion device with the combustor. By adopting the technical scheme, because the mixing assembly mixes the smoke and the steam of the low-nitrogen combustion device and the external air and reintroduces the mixed gas into the combustor for combustion, when the mixed gas reenters the hearth of the gas boiler for combustion, the temperature in the furnace can be reduced so as to reduce the concentration of the discharged NOx.
Description
Technical Field
The utility model relates to a mechanical device, in particular to gas boiler low-nitrogen combustion control device.
Background
With the increasing demand of people for good life, the environmental requirements are higher and higher. In the boiler industry, emission standards are getting tighter and tighter, the serious pollution problem of dust, sulfur dioxide and the like discharged by small coal-fired boilers is gradually eliminated by government departments, and the gas-fired boilers are replaced by gas-fired boilers, namely boilers for burning natural gas, wherein the natural gas belongs to clean fuel, pollutants generated by burning are less, the emission of dust and sulfur dioxide is nearly zero, the scheme of changing coal into gas is approved by all levels of governments, and the scheme of changing coal into gas is promoting the gas change of coal in China. The relative contribution of NOx to PM2.5 is increased year by year, and the relative contribution of NOx to PM2.5 becomes a key prerequisite for controlling PM 2.5. With the gradual promotion of changing coal into gas, the combustion of the natural gas boiler becomes an important source of NOx pollution, and the control of the NOx emission of the natural gas boiler has important significance.
The national standard for the emission of boiler atmospheric pollutants has a special standard 'emission standard of boiler atmospheric pollutants', and limits of the emission concentration of the atmospheric pollutants are regulated, wherein the NOx emission concentration of a newly-built natural gas boiler is required to be not more than 200mg/m3, and the NOx emission concentration of a natural gas boiler in an important area is required to be not more than 150mg/m 3. The local standards stricter than the national standards are issued or revised in turn in Guangdong, Xiamen, Shanghai, Beijing, Tianjin, Chongqing, Shandong and the like, and the limit value of the NOx emission concentration is required to be higher.
At present, two ways are available for controlling the NOx emission concentration of a natural gas boiler, one way is to add a flue gas treatment device at the tail of the boiler so as to achieve the purpose of purifying flue gas, and the technical measure has large economic investment and high maintenance cost and is not suitable for small natural gas boilers; another technique for achieving low NOx emissions by achieving low NOx formation in natural gas fired furnaces includes: novel low NOx burners, staged combustion, lean premixed combustion, flameless combustion, swirl combustion, flue gas recirculation, and various low nitrogen technology combinations.
New low NOx burners are expensive to purchase, and are expensive in the millions. Staged combustion is used in many applications in gas turbines and is not suitable for industrial boilers. Lean premixing has problems of unstable combustion, influence on boiler thermal efficiency and the like, and further research is needed. Flameless combustion is a promising low-nitrogen combustion technology, and the current technology is not mature. The low-nitrogen effect of the swirl combustion needs to be further researched. The flue gas recirculation technology has low operation cost and convenient maintenance, and is suitable for the project of natural gas boiler transformation in consideration of economy, technology and safety.
The flue gas recirculation technology refers to a combustion mode that part of flue gas generated by combustion is mixed with an oxidant and then participates in combustion again. The principle is that a part of flue gas with lower temperature at the tail part of the boiler is sent into the furnace through the recirculation fan again, so that the flue gas with lower oxygen content is mixed into the air in the furnace, the oxygen content in the mixed gas is lower than the oxygen content in the original air, the natural gas is in an anoxic combustion state, the combustion temperature is controlled, and the generation concentration of NOx is reduced.
However, the technical effect of flue gas recirculation is influenced by factors such as the amount of recirculated flue gas, the temperature of the mixed gas, the point of flue gas withdrawal, the flue gas composition, etc. For the same boiler, a group of different influencing factors have different influences on NOx emission; even the same influencing factor will vary for different boilers with respect to NOx emission concentration. In engineering application, the amount of recycled flue gas is often difficult to control, so that the boiler is unstable in combustion, and flameout occurs occasionally. On the other hand, because the temperature of the exhaust smoke is not high, the temperature of the smoke is lower than the dew point temperature after the recirculated smoke and the cold air are mixed, the dew point corrosion problem is easily caused, and therefore, a pipeline is corroded, and the service life is influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a gas boiler low-nitrogen combustion controlling means, not only effectively combined utilize low-nitrogen technologies such as flue gas recirculation technique and stove interior steam spraying technique, still solved the dew point corrosion problem of flue gas in the engineering application of flue gas recirculation technique.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a low-nitrogen combustion control device of a gas boiler comprises:
the gas boiler comprises a burner and a hearth, and the burner is communicated with the hearth to complete combustion; and
a low nitrogen combustion device, low nitrogen combustion device has a flue gas import and a steam inlet, the flue gas import intercommunication furnace's exhaust port, low nitrogen combustion device includes a steam conduit, a flue gas circulation pipeline and an air conduit, wherein the one end intercommunication of flue gas circulation pipeline the flue gas import is in order to follow the gas boiler is discharged fume and is located to acquire the flue gas, the one end intercommunication of steam conduit steam inlet acquires steam in order to follow the outside, air conduit's one end intercommunication outside air, low nitrogen combustion device still includes an draught fan, the draught fan intercommunication low nitrogen combustion device with the combustor, make low nitrogen combustion device can mix steam, flue gas and air, and pass through the draught fan circulates extremely the combustor.
Preferably, the low-nitrogen combustion device further comprises a spiral mixer and a venturi mixer, wherein the spiral mixer is respectively communicated with the other end of the flue gas circulation pipeline, the other end of the steam pipeline and the other end of the air pipeline, and the spiral mixer and the venturi mixer are communicated with each other, so that when the steam, the flue gas and the air are mixed in the spiral mixer, the mixed gas enters the venturi mixer for mixing.
Preferably, the steam pipe is close to the air pipe so that the steam and air are mixed first in the helical mixer.
Preferably, the flue gas circulation pipeline is respectively provided with an opening and closing valve and an adjusting valve, the opening and closing valve is used for closing and opening the flue gas circulation pipeline, and the adjusting valve is used for adjusting the flue gas flow in the flue gas circulation pipeline.
Preferably, the steam pipeline is respectively provided with an opening and closing valve and a regulating valve, the opening and closing valve is used for closing and opening the steam circulation pipeline, and the regulating valve is used for regulating the steam flow in the steam circulation pipeline.
Preferably, an opening and closing valve for closing and opening the air duct and an adjusting valve for adjusting the flow rate of air in the air duct are respectively provided on the air duct.
Preferably, the flue gas circulation pipe is provided with a flow meter to measure the flue gas flow in the flue gas circulation pipe.
Preferably, the steam pipe is provided with a flow meter to measure a steam flow rate in the steam circulation pipe.
Preferably, the air duct is provided with a flow meter to measure the flow of air in the air duct.
Adopt above-mentioned technical scheme, because the mixing assembly will low nitrogen combustion device's flue gas and steam and outside air mix and reintroduce the combustor burning makes the utility model discloses beneficial effect lies in:
firstly, the mixed gas contains steam, so that the temperature of the mixed gas is increased, condensation of water drops is avoided, corrosion of a pipeline is avoided, and on the other hand, when the mixed gas reenters the inner hearth of the low-nitrogen combustion device, the temperature in the furnace can be reduced, and the concentration of discharged NOx is reduced.
Secondly, steam introduced by the low-nitrogen combustion device is directly sprayed into air for heating, so that dew point corrosion generated after cold air and low-temperature flue gas are mixed can be avoided.
Thirdly, the spiral mixer with mix back gas mixture space each point composition very even in the venturi mixer, effectively avoided air, steam, flue gas three separation, help furnace flame combustion stability, effectively avoid furnace flameout phenomenon to produce.
Fourth, the utility model provides a flue gas volumn compares in the flue gas volumn of normal flue gas extrinsic cycle, and it can absorb more heat to add steam in furnace under same operating mode, therefore adds steam and can reduce required circulating flue gas volumn, improves the oxygen concentration after air and the flue gas mix, strengthens the stability of boiler burning.
Fifthly, a regulating valve and a flowmeter are arranged and can be regulated according to the actual operation condition of the boiler, so that the lowest NOx emission concentration is achieved; the spiral mixer with make each component of mist respectively even in the venturi mixer in the space, can avoid the inhomogeneous problem of mist spatial distribution to help the stable continuation of boiler combustion.
Drawings
Fig. 1 is an overall schematic view of a low-nitrogen combustion control device of a gas boiler according to the present invention;
fig. 2 is the gas circulation schematic diagram of the low-nitrogen combustion control device of the gas boiler of the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, the utility model provides a low-nitrogen combustion control device for a gas boiler. The low-nitrogen combustion control device of the gas boiler comprises a gas boiler 10, wherein the gas boiler comprises a burner 20 and a hearth 30, and the burner 20 is communicated with the hearth 30 to complete combustion inside the boiler.
The gas boiler low-nitrogen combustion control device further comprises a low-nitrogen combustion device 40, wherein the low-nitrogen combustion device 40 comprises a flue gas inlet 31 and a steam inlet 32, wherein the internal furnace of the furnace 30 is communicated with the flue gas inlet 31, so that flue gas is discharged through the flue gas inlet 31, and steam is discharged through the steam inlet 32.
The concentration of NOx generated in the combustion process of the hearth 30 is high, and the direct emission does not meet the national emission standard. The low-nitrogen combustion device 40 is thus in communication with the flue gas inlet 31 and the steam inlet 32, so that the low-nitrogen combustion device 40 can combine the flue gas, steam and outside air and is in communication with the burner 20 and the furnace 30.
Specifically, the low-nitrogen combustion device 40 includes a flue gas circulation pipe 41, a steam pipe 42 and an air pipe 43, wherein one end of the flue gas circulation pipe 41 is communicated with the flue gas inlet 31, one end of the steam circulation pipe 42 is communicated with the steam inlet 32, and one end of the air pipe 43 is communicated with the outside air.
The low-nitrogen combustion device 40 further comprises a spiral mixer 401 and a venturi mixer 402, wherein the spiral mixer 402 is respectively communicated with the other end of the flue gas circulation pipeline 41, the other end of the steam pipeline 42 and the other end of the air pipeline 43. So that the steam, flue gas and air are mixed in the helical mixer 401. Further, the spiral mixer 401 and the venturi mixer 402 are in communication with each other such that the steam, the flue gas, and the air enter the venturi mixer 402 for mixing after being mixed in the spiral mixer 401.
An opening and closing valve 411 and an adjusting valve 412 are respectively arranged on the flue gas circulation pipeline 41, the opening and closing valve 411 is used for closing and opening the flue gas circulation pipeline 41, and the adjusting valve 412 is used for adjusting the flue gas flow in the flue gas circulation pipeline 41.
The steam circulation pipeline 42 is respectively provided with an open-close valve 421 and an adjusting valve 422, the open-close valve 411 is used for closing and opening the steam pipeline 42, and the adjusting valve 422 is used for adjusting the steam flow in the steam pipeline 42.
An opening/closing valve 431 and a regulating valve 432 are respectively provided in the air duct 43, the opening/closing valve 431 being used to close and open the air duct 43, and the regulating valve 432 being used to regulate the flow rate of air in the air duct 43.
It is worth mentioning that the air in the air duct 43 is first mixed with the steam in the steam duct 42, so that the mixed gas is heated and humidified. And then mixed in the spiral mixer 401 with the flue gas in the flue gas circulation duct 41.
Further, an induced draft fan 50 is disposed between the venturi mixer 402 and the burner 20. Draught fan 50 intercommunication venturi mixer 402 with combustor 20 for the mist after the mixture passes through again draught fan 50 gets into combustor 20, and then is in burn in the furnace 30.
In addition, flow meters 433, 413, and 423 for calculating the gas flow rates through the air duct 43, the flue gas circulation duct 41, and the steam duct 42 are respectively provided among the air duct 43, the flue gas circulation duct 41, and the steam duct 42.
It should be noted that the inclusion of steam in the mixed gas increases the temperature of the mixed gas, prevents the condensation of water droplets, and prevents the corrosion of the duct, and on the other hand, when the mixed gas re-enters the furnace chamber 30, the temperature in the furnace can be lowered, and the concentration of the discharged NOx can be reduced. In addition, the steam generated by the boiler 10 is sprayed into the air for heating, so that dew point corrosion generated after the cold air is mixed with the low-temperature flue gas can be avoided.
Simultaneously, spiral mixer 401 with mix back gas mixture space each point composition very even in the venturi mixer 402, effectively avoided air, steam, flue gas three to separate, help furnace flame combustion stability, effectively avoid furnace flameout phenomenon to produce.
Additionally, the utility model provides a flue gas volumn compares in the flue gas volumn of normal flue gas extrinsic cycle, and it can absorb more heat to add steam in furnace under same operating mode, therefore adds steam and can reduce required circulating flue gas volumn, improves the oxygen concentration after air and the flue gas mix, strengthens the stability of boiler burning.
Finally, a regulating valve and a flowmeter are arranged, and the regulating valve and the flowmeter can be regulated according to the actual operation condition of the boiler, so that the lowest NOx emission concentration is achieved; the spiral mixer 401 and the venturi mixer 402 make the components of the mixed gas respectively uniform in space, so that the problem of nonuniform spatial distribution of the mixed gas can be avoided, and the stable and continuous combustion of the boiler is facilitated.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (9)
1. A gas boiler low-nitrogen combustion control device is characterized by comprising:
the gas boiler comprises a burner and a hearth, and the burner is communicated with the hearth to complete combustion; and
a low nitrogen combustion device, low nitrogen combustion device has a flue gas import and a steam inlet, the flue gas import intercommunication furnace's exhaust port, low nitrogen combustion device includes a steam conduit, a flue gas circulation pipeline and an air conduit, wherein the one end intercommunication of flue gas circulation pipeline the flue gas import is in order to follow the gas boiler is discharged fume and is located to acquire the flue gas, the one end intercommunication of steam conduit steam inlet acquires steam in order to follow the outside, air conduit's one end intercommunication outside air, low nitrogen combustion device still includes an draught fan, the draught fan intercommunication low nitrogen combustion device with the combustor, make low nitrogen combustion device can mix steam, flue gas and air, and pass through the draught fan circulates extremely the combustor.
2. The low-nitrogen combustion control device of a gas boiler according to claim 1, further comprising a spiral mixer and a venturi mixer, wherein the spiral mixer communicates with the other end of the flue gas circulation pipe, the other end of the steam pipe and the other end of the air pipe, respectively, and the spiral mixer and the venturi mixer communicate with each other, so that the steam, the flue gas and the air enter the venturi mixer to be mixed after being mixed in the spiral mixer.
3. The gas boiler low nitrogen combustion control device as set forth in claim 2, wherein said steam pipe is adjacent to said air pipe so that said steam and air are mixed first in said helical mixer.
4. The low-nitrogen combustion control device of the gas boiler according to claim 3, wherein an open-close valve and an adjusting valve are respectively arranged on the flue gas circulation pipeline, the open-close valve is used for closing and opening the flue gas circulation pipeline, and the adjusting valve is used for adjusting the flow rate of flue gas in the flue gas circulation pipeline.
5. The low-nitrogen combustion control device of the gas boiler according to claim 4, wherein an open-close valve and a regulating valve are respectively provided on the steam pipeline, the open-close valve is used for closing and opening the steam pipeline, and the regulating valve is used for regulating the steam flow in the steam pipeline.
6. The low-nitrogen combustion control device of a gas boiler according to claim 5, wherein an open-close valve for closing and opening the air duct and an adjustment valve for adjusting the flow rate of air in the air duct are provided on the air duct, respectively.
7. The gas boiler low-nitrogen combustion control device as set forth in claim 4, wherein said flue gas circulation duct is provided with a flow meter to measure a flow rate of flue gas in said flue gas circulation duct.
8. The gas boiler low nitrogen combustion control device as set forth in claim 5, wherein said steam pipe is provided with a flow meter to measure a flow rate of steam in said steam pipe.
9. The gas boiler low nitrogen combustion control apparatus as set forth in claim 6, wherein said air duct is provided with a flow meter to measure the flow rate of air in said air duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920438995.8U CN210069842U (en) | 2019-04-02 | 2019-04-02 | Low-nitrogen combustion control device of gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920438995.8U CN210069842U (en) | 2019-04-02 | 2019-04-02 | Low-nitrogen combustion control device of gas boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210069842U true CN210069842U (en) | 2020-02-14 |
Family
ID=69435651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920438995.8U Expired - Fee Related CN210069842U (en) | 2019-04-02 | 2019-04-02 | Low-nitrogen combustion control device of gas boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210069842U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503628A (en) * | 2020-03-26 | 2020-08-07 | 同济大学 | Method for measuring gas boiler flue gas recirculation rate |
| CN113546518A (en) * | 2021-08-13 | 2021-10-26 | 重庆市蔚兰环保科技有限公司 | Zero-emission method for treating garbage carbonization odor through steam |
| CN113790439A (en) * | 2021-10-25 | 2021-12-14 | 绍兴市能源检测院 | Low-nitrogen combustion automatic control system of gas boiler |
| CN114061317A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
| CN114060806A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for light-burning kiln |
-
2019
- 2019-04-02 CN CN201920438995.8U patent/CN210069842U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503628A (en) * | 2020-03-26 | 2020-08-07 | 同济大学 | Method for measuring gas boiler flue gas recirculation rate |
| CN113546518A (en) * | 2021-08-13 | 2021-10-26 | 重庆市蔚兰环保科技有限公司 | Zero-emission method for treating garbage carbonization odor through steam |
| CN113546518B (en) * | 2021-08-13 | 2022-04-29 | 重庆市蔚兰环保科技有限公司 | Zero-emission method for treating garbage carbonization odor through steam |
| CN114061317A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
| CN114060806A (en) * | 2021-10-15 | 2022-02-18 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for light-burning kiln |
| CN114061317B (en) * | 2021-10-15 | 2024-01-09 | 辽宁中石新亚能源发展有限公司 | Low-nitrogen combustion transformation method and system for medium-grade kiln |
| CN113790439A (en) * | 2021-10-25 | 2021-12-14 | 绍兴市能源检测院 | Low-nitrogen combustion automatic control system of gas boiler |
| CN113790439B (en) * | 2021-10-25 | 2024-03-19 | 绍兴市能源检测院 | Automatic control system for low-nitrogen combustion of gas boiler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210069842U (en) | Low-nitrogen combustion control device of gas boiler | |
| CN106247368A (en) | A kind of industrial coal powder boiler flue gas recirculation low nitrogen burning method and system | |
| CN102635852A (en) | Fuel oil/gas boiler for reducing emission of nitric oxides and method | |
| WO2021169326A1 (en) | Low-nitrogen gas burner suitable for medium-and-low heat value fuels | |
| US20010046649A1 (en) | Low pollution emission burner | |
| CN112555828A (en) | Hearth and combustor cooling type surface cold flame premixing gas boiler | |
| CN108506935A (en) | Based on the low NOx gas burners recycled in combustion gas and the method for reducing discharge | |
| CN109442392A (en) | A kind of gas fired-boiler and its low nitrogen burning method | |
| CN107869911A (en) | A kind of energy-saving and emission-reduction gas supply-discharge system of tubular heater | |
| CN103090541A (en) | Inverted full-premix condensing gas water heater | |
| CN206739256U (en) | A kind of single backhaul WNS structure boilers | |
| CN209470201U (en) | A kind of gas fired-boiler | |
| CN104154533A (en) | Reverse flow pre-mixing type pulverized coal low-nitrogen combustor and combustion method thereof | |
| CN106168376A (en) | A kind of twin furnace coal dust gasification low nitrogen burning Industrial Boiler | |
| WO2020259577A1 (en) | Combustor with low nitrogen oxide emission | |
| CN205560735U (en) | Low NOX combustor | |
| CN204987008U (en) | Bispin STREAMING low heat value gas combustion ware | |
| CN208457958U (en) | Based on the low NOx gas burner recycled in combustion gas | |
| CN201152622Y (en) | All-premixing burning gas water heating stove | |
| CN107860011B (en) | Carbon black tail gas incineration boiler with carbon black drying waste gas treatment function | |
| CN207585344U (en) | A kind of energy-saving and emission-reduction gas supply-discharge system of tubular heater | |
| CN215259784U (en) | Combustion system for reducing emission of nitrogen oxides by utilizing flue gas external circulation | |
| CN108662609A (en) | A kind of oxygen-enriched combusting heat-conducting oil furnace air and gas system | |
| CN109442400B (en) | Standing vortex type smoke internal circulation low-nitrogen combustor | |
| CN212108369U (en) | Low-nitrogen burner system of gas fuel with adjustable subregion burning mixes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200214 Termination date: 20210402 |