CN211739067U - Low-nitrogen gas combustion system - Google Patents
Low-nitrogen gas combustion system Download PDFInfo
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- CN211739067U CN211739067U CN201922033648.XU CN201922033648U CN211739067U CN 211739067 U CN211739067 U CN 211739067U CN 201922033648 U CN201922033648 U CN 201922033648U CN 211739067 U CN211739067 U CN 211739067U
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Abstract
The utility model relates to a low nitrogen combustion system of gas, it includes gas air regulating valve, flue gas governing valve, boiler, flue gas on-line monitoring instrument and burning control module. The utility model discloses a flue gas on-line monitoring instrument NOx, CO and O in to the flue gas2The concentration is monitored in real time, and signals are transmitted to a combustion control module for combustion controlThe module feeds back the concentration signal and realizes full load standard reaching by controlling the opening of the regulating valve.
Description
Technical Field
The utility model relates to a combustion system, particularly, the utility model relates to a low nitrogen combustion system of gas.
Background
The action plan of three years of guard war of winning blue sky in Beijing City is put forward, and by 2020, the goal of improving the environmental air quality in Beijing City is further improved on the basis of the planning goal of thirteen five, and the emission of nitrogen oxides and volatile organic compounds is reduced by more than 30% compared with that in 2015; the rate of heavy pollution days is reduced by more than 25% compared with that in 2015. In order to achieve the aim, low-nitrogen reconstruction of boilers is prepared in Beijing and all over the country, the existing boilers are required to be subjected to low-nitrogen reconstruction, and the newly-built boilers are required to adopt a low-nitrogen combustion technology to ensure that nitrogen oxides are discharged at 30mg/m3The following.
Chinese patent application CN107883374A discloses a low-nitrogen combustion system and process for a natural gas boiler, which adopts the technical scheme that: part of flue gas is taken from an upper opening of a flue gas exhaust duct from the outlet of the natural gas boiler to the front of the chimney, is pressurized by a circulating fan and then is sent into a combustion-supporting air duct, is uniformly mixed with combustion-supporting air by a flue gas mixing device, and is sent into the boiler together through a burner nozzle. Because the oxygen content of the flue gas is lower than that of air, the oxygen content of the mixed combustion-supporting gas mixed with the flue gas is also reduced, so that the oxygen content of a local combustion area is reduced under the working conditions of not reducing the combustion-supporting air quantity and not changing the mixing and fluidization of a gas flow field and fuel in the furnace, and the local combustion temperature is synchronously reduced. The low-nitrogen combustion system of the natural gas boiler only adjusts a part of outlet flue gas and returns the part of the outlet flue gas to the combustion-supporting air duct, so that the combustion efficiency of the boiler is influenced certainly while the oxygen content of mixed combustion-supporting gas is reduced.
In areas with more coal mines, gas is mostly adopted as fuel, so the research on the low-nitrogen combustion of the gas has great significance for reducing the emission of nitrogen oxides of the gas-fired boiler.
SUMMERY OF THE UTILITY MODEL
Compared with natural gas as fuel, the prior art problem of using gas as fuel gas is that: the gas is great because of concentration variation, adopts traditional combustion control system to be difficult to guarantee that gas boiler homoenergetic is up to standard under full load, perhaps nitrogen oxide is too high when reaching standard flue gas oxygen content, and the boiler energy consumption is high, efficient. At present, no prior art discloses such a low-nitrogen combustion system using gas as combustion gas. Therefore, the utility model provides a low nitrogen combustion system of gas realizes full load up to standard in gas concentration variation within range.
The utility model provides a not enough and present market's needs to prior art, the utility model provides a pollutant discharge is low, full load is up to standard, the energy consumption is low, efficient gas low nitrogen combustion system.
Particularly, the utility model provides a low nitrogen combustion system of gas, it includes flue gas control valve 6 and boiler 7, characterized by, this low nitrogen combustion system of gas still includes: the device comprises a gas regulating valve 4, an air regulating valve 5, a flue gas on-line monitoring instrument 8 and a combustion control module 9; the combustion control module 9 is connected with the regulating valve 4, the air regulating valve 5 and the flue gas regulating valve 6, and is used for controlling the opening degrees of the gas regulating valve 4, the air regulating valve 5 and the flue gas regulating valve 6 and regulating the flow of gas, air and flue gas;
wherein, the flue gas on-line monitoring instrument 8 is connected with a flue gas outlet of the boiler 7 and is used for monitoring the concentration of NOx, CO and oxygen in the flue gas in real time;
wherein, the gas regulating valve 4 and the air regulating valve 5 are arranged at the front end of the boiler 7 and are respectively used for controlling the flow of gas and air introduced into the boiler;
the flue gas regulating valve 6 is arranged on a return channel between the boiler 7 and the flue gas on-line monitoring instrument 8 and is used for controlling the flow of flue gas returning to the boiler.
Preferably, according to the above gas low-nitrogen combustion system, the online flue gas monitoring instrument 8 is electrically connected to the combustion control module 9, and is configured to transmit the NOx, CO and oxygen concentration signals to the combustion control module 9 in real time.
Preferably, according to the above gas low-nitrogen combustion system, it further comprises a pressure gauge 2 for detecting pressure change of the gas.
Preferably, according to the above gas low-nitrogen combustion system, it further comprises a pressurization air pump 1 for increasing the gas pressure when the gas pressure is low.
Preferably, according to the above gas low-nitrogen combustion system, it further comprises a gas storage tank 3 for storing pressurized gas.
Adopt the utility model discloses a low nitrogen combustion system of gas can gain following beneficial effect:
1. the system adopts a flue gas recirculation technology, and the addition of the recirculated flue gas reduces the oxygen partial pressure in a combustion area, reduces the combustion temperature and inhibits the generation of NOx;
2. the system adopts the combination of the flue gas on-line monitoring instrument and the combustion control module, can realize the automatic regulation of the flow of gas, air and flue gas, reduce the energy consumption and improve the boiler efficiency;
3. the system can automatically control the gas, air and flue gas regulating valves according to the change of the concentration of the gas, and realize the emission of full-load pollutants reaching the standard.
Drawings
Fig. 1 is a schematic view of a gas low-nitrogen combustion system according to a preferred embodiment of the present invention.
Wherein: 1-a pressurized air pump, 2-a pressure gauge, 3-an air storage tank, 4-a gas regulating valve, 5-an air regulating valve, 6-a flue gas regulating valve, 7-a boiler, 8-a flue gas on-line monitoring instrument and 9-a combustion control module.
Detailed Description
The utility model provides a brand-new gas low-nitrogen combustion system, which is applicable to more areas in coal mines.
In areas with more coal mines, gas is associated with the coal mines, compared with natural gas, the use of gas as combustion gas has many inconveniences, and the main problems are that the gas pressure is unstable, the concentration is unstable, and the combustible components of the gas in each area change greatly, so that a gas low-nitrogen combustion system which meets the national environmental protection policy, can control the combustion temperature and inhibit the generation of nitrogen oxides is needed at present in order to meet the national environmental protection requirement.
The utility model discloses a system's starting point is to adopt flue gas recirculation technical control combustion temperature, restraines nitrogen oxide's formation, to the great gas of concentration fluctuation simultaneously, adopts automatic regulating apparatus to realize the automatically regulated to gas, air and flue gas flow.
The gas low-nitrogen combustion system of the present invention will be described in detail with reference to the accompanying drawings.
The utility model discloses an among the low nitrogen combustion system of gas, be provided with gas air regulating valve 4, air regulating valve 5, flue gas governing valve 6, boiler 7, flue gas on-line monitoring instrument 8 and combustion control module 9.
The gas and the air enter the boiler through a gas pipeline and an air pipeline respectively, the gas flow is regulated by a gas regulating valve 4, and the air flow is regulated by an air regulating valve 5. Preferably, a pressure gauge 2 is installed on the gas pipeline, and the pressure of the gas is monitored by the pressure gauge 2.
For realizing the low-nitrogen combustion of gas, send into furnace combustion area at 7 tail end extraction part flue gases of boiler, the flue gas oxygen concentration of joining is lower, can reduce combustion area oxygen partial pressure, and then reduces combustion temperature, restraines NOx's formation, and nevertheless the flue gas volume has very big influence to the stability of burning, consequently, sets up flue gas governing valve 6 on the flue gas returning pipe and is used for adjusting the flue gas flow.
The tail end of the boiler 7 is respectively and sequentially provided with a flue gas on-line monitoring instrument 8 and a combustion control module 9. Flue gas on-line monitoring instrument 8 monitors NOx, CO and O in flue gas in real time2Concentration and transmits a concentration signal to the combustion control module 9. NOx, CO, O are preset in the combustion control module 92The concentration value and the opening ranges of the gas regulating valve 4, the air regulating valve 5 and the flue gas regulating valve 6 corresponding to the concentration value, when NOx, CO and O are monitored by the flue gas on-line monitoring instrument 82When any concentration exceeds the preset concentration value, the combustion control module 9 immediately feeds back the concentration signal, respectively controls and adjusts the opening degrees of the gas regulating valve 4, the air regulating valve 5 and the flue gas regulating valve 6, and further adjusts the flow rates of gas, air and flue gas to enable NOx, CO and O in the flue gas2The concentration is restored to the preset value.
In the preferred embodiment of the present invention, the gas low-nitrogen combustion system further comprises a pressurization air pump 1, and the start and stop of the pressurization air pump 1 depends on the indication of the pressure gauge 2. The pressure fluctuation of the gas is large, and in order to prevent the too low pressure and the unavailable combustion process, a pressurizing air pump 1 is adopted to pressurize the gas. When the reading of the pressure gauge 2 is not lower than the pressure required for stable combustion operation, the pressurization air pump 1 is suspended, and when the reading of the pressure gauge 2 is lower than the pressure required for stable combustion operation, the pressurization air pump 1 is started.
In the preferred embodiment of the present invention, the gas tank 3 is further installed in the gas low-nitrogen combustion system. The gas storage tank 3 is used for storing the pressurized gas, the gas can be pressurized to a certain pressure and stored in the gas storage tank, and when the gas pressure is reduced to a certain degree, the pressurization air pump 1 is started again, so that the requirement of sudden increase of gas consumption of gas-using equipment can be met, and more stable gas consumption is ensured; on the other hand, the energy-saving effect is achieved, the frequent starting and stopping of the pressurization air pump 1 can enable the current consumption of the motor to be very large, the air storage tank 3 can ensure the automatic shutdown of the pressurization air pump 1, and after the air storage tank 3 is filled with gas, the pressurization air pump 1 can be automatically stopped, so that the electric energy is not wasted due to the fact that the pressurization air pump 1 is operated all the time.
Example (b):
adopt the utility model discloses a gas low nitrogen combustion system specifically carries out a concrete implementation scheme of burning control as follows:
the adopted gas low-nitrogen combustion system is provided with a gas air regulating valve 4, an air regulating valve 5, a flue gas regulating valve 6, a boiler 7, a flue gas online monitoring instrument 8 and a combustion control module 9, wherein when the gas concentration is 38%, flue gas components of different loads and the opening degrees of the air regulating valve, the flue gas regulating valve and the gas air regulating valve which stably run are obtained by regulating the combustion control system, and the specific data are shown in the following table 1:
TABLE 1
1: the load refers to the boiler output and is realized by adjusting the gas amount. If the rated output of the boiler is 2 steam tons, 50 percent of load, namely the output of the boiler is 1 steam ton.
The data of the opening degrees of the air regulating valve, the flue gas regulating valve and the gas regulating valve in the upper table are set in the combustion control module, and the opening degrees are allowed to float up and down by 20% under each load. Setting NOx of the smoke on-line detection instrument to be less than or equal to 30mg/m3、CO≤20mg/m 33% -4.5%, the flue gas on-line monitoring instrument transmits the signal in real time to the combustion control module, and the combustion control module feeds back the concentration signal, and when arbitrary numerical value exceedes the settlement scope, the combustion control module automatically regulated air regulating valve, flue gas governing valve and the aperture of gas air regulating valve, until NOx concentration, CO concentration and oxygen content resume to the settlement within range in the on-line monitoring instrument.
After a period of operation at 75% load when the boiler was operating at a gas concentration of between 30% and 45%, the monitored data are shown in table 2 below:
TABLE 2
As can be seen from the monitored data, the system has the automatic regulation function, even if the concentration of the gas fluctuates, the boiler can still realize ultralow nitrogen emission, and the emission of nitrogen oxides is not more than 30mg/Nm3。
Compare with current low nitrogen combustion system, the utility model discloses a low nitrogen combustion system of gas combines together flue gas on-line monitoring instrument and combustion control module, and its advantage lies in: the existing low-nitrogen combustion system is suitable for NOx, CO and O2For a natural gas boiler with small concentration change, the gas boiler has a large concentration change range of gas, which causes NOx, CO and O in flue gas2The concentration change is large, the existing low-nitrogen combustion system can not meet the pollutant emission index, the smoke online monitoring instrument and the combustion control module are combined, and the smoke online monitoring instrument, the CO and the O can be transmitted and fed back according to NOx, CO and O in the smoke through signals2Change of concentrationThe opening degrees of the gas regulating valve, the air regulating valve and the flue gas regulating valve are automatically controlled and regulated, so that the pollutant emission reaches the standard.
The utility model discloses a low nitrogen combustion system of gas adopts flue gas recirculation technology control combustion temperature, restraines nitrogen oxide's formation, simultaneously to the great gas of concentration fluctuation, adopts flue gas on-line monitoring instrument NOx, CO and O in to the flue gas2The concentration is monitored in real time, signals are transmitted to the combustion control module, the combustion control module feeds back the concentration signals, and full load standard reaching is achieved by controlling the opening degree of the regulating valve. The utility model discloses a low nitrogen combustion system of gas has advantages such as pollutant emission is low, the energy consumption is low, boiler efficiency height.
The above preferred embodiments are provided only to illustrate the present invention, not to limit the present invention, and although the present invention has been described in detail through the above preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.
Claims (7)
1. A gas low-nitrogen combustion system comprises a flue gas regulating valve (6) and a boiler (7), and is characterized by further comprising a gas regulating valve (4), an air regulating valve (5), a flue gas online monitoring instrument (8) and a combustion control module (9); the combustion control module (9) is connected with the gas regulating valve (4), the air regulating valve (5) and the flue gas regulating valve (6) and is used for controlling the opening degrees of the gas regulating valve (4), the air regulating valve (5) and the flue gas regulating valve (6) and regulating the flow of gas, air and flue gas;
wherein, the flue gas on-line monitoring instrument (8) is connected with a flue gas outlet of the boiler (7) and is used for monitoring the concentration of NOx, CO and oxygen in the flue gas in real time;
the gas regulating valve (4) and the air regulating valve (5) are arranged at the front end of the boiler (7) and are respectively used for controlling the flow of gas and air introduced into the boiler;
the flue gas regulating valve (6) is arranged on a return channel between the boiler (7) and the flue gas on-line monitoring instrument (8) and is used for controlling the flow of the flue gas returning to the boiler.
2. The gas low-nitrogen combustion system as claimed in claim 1, wherein the on-line flue gas monitoring instrument (8) is electrically connected with the combustion control module (9) and is used for transmitting NOx, CO and oxygen concentration signals to the combustion control module (9) in real time.
3. The gas low-nitrogen combustion system according to claim 1, further comprising a pressure gauge (2) for detecting a pressure change of the gas.
4. The gas low-nitrogen combustion system according to claim 2, further comprising a pressure gauge (2) for detecting a pressure change of the gas.
5. The gas low-nitrogen combustion system according to any one of claims 1 to 4, further comprising a pressurization gas pump (1) for increasing the gas pressure when the gas pressure is low.
6. The gas low-nitrogen combustion system according to any one of claims 1 to 4, further comprising a gas tank (3) for storing the pressurized gas.
7. The gas low-nitrogen combustion system as set forth in claim 5, further comprising a gas tank (3) for storing the pressurized gas.
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| CN201922033648.XU CN211739067U (en) | 2019-11-22 | 2019-11-22 | Low-nitrogen gas combustion system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266842A (en) * | 2021-04-30 | 2021-08-17 | 广东中发恒翰科技有限公司 | Automatic control system and method for magnetization energy-saving device |
| CN114198759A (en) * | 2021-11-23 | 2022-03-18 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen amount of garbage incinerator |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266842A (en) * | 2021-04-30 | 2021-08-17 | 广东中发恒翰科技有限公司 | Automatic control system and method for magnetization energy-saving device |
| CN113266842B (en) * | 2021-04-30 | 2024-04-26 | 广东中发恒翰科技有限公司 | Automatic control system and method for magnetization energy-saving device |
| CN114198759A (en) * | 2021-11-23 | 2022-03-18 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen amount of garbage incinerator |
| CN114198759B (en) * | 2021-11-23 | 2024-05-28 | 浦湘生物能源股份有限公司 | Self-adaptive control method and system for oxygen content of garbage incinerator |
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