CN209819528U - Biomass boiler multistage air distribution system capable of reducing nitrogen oxides - Google Patents
Biomass boiler multistage air distribution system capable of reducing nitrogen oxides Download PDFInfo
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- CN209819528U CN209819528U CN201920044444.3U CN201920044444U CN209819528U CN 209819528 U CN209819528 U CN 209819528U CN 201920044444 U CN201920044444 U CN 201920044444U CN 209819528 U CN209819528 U CN 209819528U
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Abstract
The utility model relates to a biomass boiler multistage air distribution system with reduce nitrogen oxide belongs to boiler environmental protection technical field. The primary air system is positioned at the lower part of the grate, the flue gas circulating system is positioned at one side of the primary air system, and the secondary air system and the tertiary air system are respectively positioned at the upturning positions of the front arch and the rear arch; the primary air system comprises a fan, a main pipeline, branch pipelines, a boiler air supply outlet and nine air chambers B which are mutually independent, wherein the fan is connected with the boiler air supply outlet through the main pipeline and the branch pipelines, the fan conveys external air to the main pipeline through an air pipeline and then to the branch pipelines of the nine air chambers B through the main pipeline, and the branch pipelines control the air supply quantity of the pipelines through the automatic air quantity regulating valves of the air chambers B. Has the advantages that: novel conception, simple structure and safe and convenient use. The emission of nitrogen oxides of the biomass boiler is reduced, the energy is saved, the environment is protected, and the practicability is high.
Description
Technical Field
The utility model relates to a boiler environmental protection technology field, in particular to biomass boiler multistage air distribution system indicates a biomass boiler multistage air distribution system with reduce nitrogen oxide especially.
Background
At present, biomass boilers are accepted by more and more energy-using customers from the aspects of environmental protection and economy. As a fourth large energy reservoir, biomass has its unique advantages in replacing coal. The biomass fuel has the characteristics of low sulfur, low nitrogen, high volatile matter, easy ignition, zero emission of carbon dioxide and the like. The nitrogen oxide in the flue gas mainly comes from the generation of thermal nitrogen oxide in the combustion process, so the combustion temperature of a hearth is well controlled, and the requirement of most local environmental protection emission can be met without additionally installing sulfur removal and denitration equipment. Is economical and environment-friendly.
The control of the temperature of the hearth is good, and the reasonable air distribution is the key. At present, air distribution of a biomass boiler mainly supplies air at a feed inlet, so that the air supply is not uniform, the local temperature is too high, the fuel is not completely combusted, and thermal nitrogen oxides are generated, so that the nitrogen oxides in smoke exceed the standard.
Disclosure of Invention
An object of the utility model is to provide a biomass boiler multistage air distribution system with reduce nitrogen oxide has solved the above-mentioned problem that prior art exists. The utility model discloses with biomass fuel segmentation burning in furnace, alleviate the combustion zone furnace internal temperature, reduce heating power type nitrogen oxide's formation, solve biomass boiler nitrogen oxide and discharge high problem.
The above object of the utility model is realized through following technical scheme:
the biomass boiler multistage air distribution system capable of reducing nitrogen oxides comprises a primary air system, a flue gas circulating system, a secondary air system and a tertiary air system, wherein the primary air system is positioned at the lower part of a grate, the flue gas circulating system is positioned at one side of the primary air system, and the secondary air system and the tertiary air system are respectively positioned at the upturning positions of a front arch 5 and a rear arch 6;
the primary air system comprises a fan 8, a main pipeline 11, branch pipelines 12, a boiler air supply outlet 13 and nine independent air chambers B2, wherein the fan 8 is connected with the boiler air supply outlet 13 through the main pipeline 11 and the branch pipelines 12, the fan 8 conveys external air to the main pipeline 11 through an air pipeline 10 and then to the branch pipelines 12 of nine air chambers B2 through the main pipeline 11, and the branch pipelines 12 control the air supply amount of the pipelines through automatic air amount adjusting valves 14 of the air chambers B.
The flue gas circulating system comprises a circulating fan 7, a flue gas pipeline 9, a flue gas circulating pipeline 15 and an independent air chamber A1, wherein the flue gas pipeline 9 is connected with an inlet of the circulating fan, and an outlet of the circulating fan is connected with a boiler air supply outlet 13 in an air chamber A1 through the flue gas circulating pipeline 15 and an automatic air quantity regulating valve 14; the air chamber A1 is positioned beside the feeding position of the grate shell, is parallel to nine air chambers B2 in the primary air system and is uniformly distributed on two sides of the grate shell; the circulating fan 7 inputs the flue gas treated by the dust remover into a flue gas circulating pipeline 15 through a flue gas pipeline 9, the flue gas circulating pipeline 15 conveys the flue gas to an air chamber A1, and the required air supply quantity is controlled through an automatic air quantity regulating valve 14.
The secondary air system comprises a front arch air delivery pipeline 16, a front arch air supply outlet 17 and a front arch air supply pipe 3, wherein the front arch air supply pipe 3 is connected with the front arch air delivery pipeline 16 at the front arch air supply outlet 17, and the front arch air delivery pipeline 16 is connected with a main pipeline 11; the front arch blast pipe 3 is positioned at the upturning position of the front arch 5 of the boiler, and the blast direction is vertical to the flow direction of the flue gas at the lower part of the hearth.
The tertiary air system comprises a rear arch air delivery pipeline 18, a rear arch air supply outlet 19 and a rear arch air supply pipe 4, wherein the rear arch air supply pipe 4 is connected with the rear arch air delivery pipeline 18 at the rear arch air supply outlet 19, and the rear arch air delivery pipeline 18 is connected with the main pipeline 11; the rear arch blast pipe 4 is positioned on a rear arch 6 of the boiler and turned out, and the blast direction is vertical to the flow direction of the flue gas at the upper part of the hearth.
The beneficial effects of the utility model reside in that: the design is novel, the structure is simple, the energy is saved, the environment is protected, and the use is safe and convenient. The primary air system and the flue gas circulating system mainly burn carbon in a combustion furnace row, and the secondary air system and the tertiary air system mainly burn volatile matters. The biomass fuel with high volatile content is combusted in sections, so that the temperature of a hearth in a combustion area is reduced. The generation of thermal nitrogen oxides is reduced. The flue gas recirculation system reduces the oxygen content in the flue gas, and reduces the conversion value of nitrogen oxides on the other hand. Thereby reducing the emission of nitrogen oxides as a whole. The practicability is strong.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate example embodiments of the invention and together with the description serve to explain the invention without limitation.
FIG. 1 is a front view of the boiler with air distribution structure of the present invention;
FIG. 2 is a diagram of a primary air system of the present invention;
FIG. 3 is a diagram of a flue gas circulation system of the present invention;
FIG. 4 is a diagram of a secondary air system of the present invention;
fig. 5 is a diagram of the tertiary air system of the present invention.
In the figure: 1. an air chamber A; 2. an air chamber B; 3. a front arch blast pipe; 4. a rear arch blast pipe; 5. front arch; 6. a rear arch; 7. a circulating fan; 8. a fan; 9. a flue gas circulation duct; 10. an air duct; 11. a header pipe; 12. a branch pipe; 13. a boiler air supply outlet; 14. an automatic air volume adjusting valve; 15. a flue gas circulation duct; 16. a front arch air supply duct; 17. a front arch air supply outlet; 18. a rear arch air supply duct; 19. and a rear arch air supply outlet.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, the multi-stage air distribution system of a biomass boiler with nitrogen oxide reduction of the present invention comprises a primary air system, a flue gas circulation system, a secondary air system and a tertiary air system, wherein the primary air system is located at the lower part of the grate, the flue gas circulation system is located at one side of the primary air system, and the secondary air system and the tertiary air system are respectively located at the upturning positions of the front arch 5 and the rear arch 6;
referring to fig. 1 and 2, the primary air system comprises a fan 8, a main duct 11, a branch duct 12, a boiler air supply outlet 13, and nine independent air chambers B2, wherein the fan 8 is connected with the boiler air supply outlet 13 through the main duct 11 and the branch duct 12, the main duct is provided with a pressure valve and a check valve, and branch pipes connected with the air chambers are provided with flow regulating valves. The boiler air supply outlet is positioned at the lower part of the fire grate and consists of nine air chambers B, and the nine air chambers B are uniformly distributed at the two sides of the fire grate shell. The air chamber B sends outdoor air into an air supply outlet by a fan. The fuel is in different combustion states along with the operation of the fire grate, and the air quantity required by each air chamber is adjusted through the variable frequency fan. The fan 8 continuously delivers the outside air to the main duct 11 through the air duct 10, and then to the branch ducts 12 of the nine air chambers B2 through the main duct 11, and the branch ducts 12 control the duct supply air quantity through the automatic air quantity adjusting valves 14 of the respective air chambers B, and deliver the reasonable air quantity to the nine air chambers B2. The fuel entering the fire grate at the same time, along with the operation of the fire grate, the combustion degree of the fuel is different in the combustion area corresponding to each air chamber, and the air volume is controlled by zones, so that the fuel is fully combusted, and the heat efficiency of the boiler is improved.
Referring to fig. 1 and 3, the flue gas circulation system comprises a circulating fan 7, a flue gas pipeline 9, a flue gas circulation pipeline 15 and an independent air chamber a1, wherein the flue gas pipeline 9 is connected with an inlet of the circulating fan, and an outlet of the circulating fan is connected with a boiler air supply outlet 13 in an air chamber a1 through the flue gas circulation pipeline 15 and an automatic air quantity regulating valve 14; the air chamber A1 is positioned on one side of the fire grate shell near the feeding position and is parallel to nine air chambers B2 in the primary air system, the main pipes of the pipelines uniformly distributed on two sides of the fire grate shell are provided with pressure valves and check valves, and the branch pipes connected with the air chambers are provided with flow regulating valves. The air source is from flue gas which is processed by the dust remover and is generated by combustion in the boiler. Can provide relatively stable oxygen supply environment for the biomass fuel in the initial combustion stage, and simultaneously reduce the oxygen content in the flue gas. The circulating fan 7 inputs the flue gas treated by the dust remover into a flue gas circulating pipeline 15 through a flue gas pipeline 9, the flue gas circulating pipeline 15 conveys the flue gas to an air chamber A1, and the required air supply amount is controlled through an automatic air amount adjusting valve 14; the method can reduce the oxygen content in the flue gas and control the production of thermal nitrogen oxides while providing air for fuel combustion in the boiler.
The fixed carbon in the biomass is mainly combusted on a grate under the combined action of a primary air system and a flue gas circulating system. The fuel is burned to a different extent and the required oxygen varies with the direction of travel of the grate. The air supply is reasonably controlled through the automatic adjustment of the air volume of the independent air chamber.
Referring to fig. 1 and 4, the secondary air system comprises a front arch air delivery duct 16, a front arch air supply outlet 17 and a front arch air supply pipe 3, wherein the front arch air supply pipe 3 is connected with the front arch air delivery duct 16 at the front arch air supply outlet 17, and the front arch air delivery duct 16 is connected with a main duct 11; the front arch blast pipe 3 is positioned at the upturning position of a front arch 5 of the boiler, and the blast direction is vertical to the flow direction of the flue gas at the lower part of the hearth; the secondary air system mainly mixes the volatile components separated out from the biomass fuel, and forms flue gas disturbance and enhances combustion under the synergistic action of the secondary air system and the primary air.
Referring to fig. 1 and 5, the tertiary air system comprises a rear arch air delivery duct 18, a rear arch air supply outlet 19 and a rear arch air supply pipe 4, wherein the rear arch air supply pipe 4 is connected with the rear arch air delivery duct 18 at the rear arch air supply outlet 19, and the rear arch air delivery duct 18 is connected with the main duct 11; the rear arch blast pipe 4 is positioned on a rear arch 6 of the boiler and turned out, and the blast direction is vertical to the flow direction of the flue gas at the upper part of the hearth. The tertiary air system is mainly used for carrying out reinforced mixing on volatile matters separated out from the biomass again so as to achieve the purpose of full combustion.
The utility model discloses a carbon in the primary air main combustion furnace row, overgrate air, tertiary air main burning volatile. The biomass fuel with high volatile content is combusted in sections, so that the temperature of a hearth in a combustion area is reduced. The generation of thermal nitrogen oxides is reduced. The flue gas recirculation system reduces the oxygen content in the flue gas to be less than or equal to 9 percent, and reduces the conversion value of nitrogen oxide on the other hand. Thereby reducing the emission of nitrogen oxides as a whole.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A biomass boiler multi-stage air distribution system capable of reducing nitrogen oxides is characterized in that: the grate comprises a primary air system, a flue gas circulating system, a secondary air system and a tertiary air system, wherein the primary air system is positioned at the lower part of the grate, the flue gas circulating system is positioned at one side of the primary air system, and the secondary air system and the tertiary air system are respectively positioned at the upturning positions of a front arch (5) and a rear arch (6);
the primary air system comprises a fan (8), a main pipeline (11), branch pipelines (12), a boiler air supply opening (13) and nine air chambers B (2) which are independent of each other, wherein the fan (8) is connected with the boiler air supply opening (13) through the main pipeline (11) and the branch pipelines (12), the fan (8) conveys external air to the main pipeline (11) through an air pipeline (10), the external air is conveyed to the branch pipelines (12) of the nine air chambers B (2) through the main pipeline (11), and the branch pipelines (12) control the air supply amount of the pipelines through automatic air volume adjusting valves (14) of the air chambers B.
2. The biomass boiler multi-stage air distribution system capable of reducing nitrogen oxides according to claim 1, is characterized in that: the flue gas circulating system comprises a circulating fan (7), a flue gas pipeline (9), a flue gas circulating pipeline (15) and an independent air chamber A (1), wherein the flue gas pipeline (9) is connected with an inlet of the circulating fan, and an outlet of the circulating fan is connected with a boiler air supply outlet (13) in the air chamber A (1) through the flue gas circulating pipeline (15) and an automatic air quantity regulating valve (14); the air chamber A (1) is positioned beside the feeding position of the grate shell, is parallel to nine air chambers B (2) in the primary air system and is uniformly distributed on two sides of the grate shell; the circulating fan (7) inputs the flue gas treated by the dust remover into a flue gas circulating pipeline (15) through a flue gas pipeline (9), the flue gas circulating pipeline (15) conveys the flue gas to the air chamber A (1), and the required air supply amount is controlled through an automatic air volume adjusting valve (14).
3. The biomass boiler multi-stage air distribution system capable of reducing nitrogen oxides according to claim 1, is characterized in that: the secondary air system comprises a front arch air delivery pipeline (16), a front arch air supply outlet (17) and a front arch air supply pipe (3), wherein the front arch air supply pipe (3) is connected with the front arch air delivery pipeline (16) at the front arch air supply outlet (17), and the front arch air delivery pipeline (16) is connected with a main pipeline (11); the front arch blast pipe (3) is positioned at the upturning position of the front arch (5) of the boiler, and the blast direction is vertical to the flow direction of the flue gas at the lower part of the hearth.
4. The biomass boiler multi-stage air distribution system capable of reducing nitrogen oxides according to claim 1, is characterized in that: the tertiary air system comprises a rear arch air delivery pipeline (18), a rear arch air supply outlet (19) and a rear arch air supply pipe (4), wherein the rear arch air supply pipe (4) is connected with the rear arch air delivery pipeline (18) at the rear arch air supply outlet (19), and the rear arch air delivery pipeline (18) is connected with a main pipeline (11); the rear arch blast pipe (4) is positioned on a rear arch (6) of the boiler and is turned out, and the blast direction is vertical to the flow direction of the flue gas at the upper part of the hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920044444.3U CN209819528U (en) | 2019-01-11 | 2019-01-11 | Biomass boiler multistage air distribution system capable of reducing nitrogen oxides |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920044444.3U CN209819528U (en) | 2019-01-11 | 2019-01-11 | Biomass boiler multistage air distribution system capable of reducing nitrogen oxides |
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| CN209819528U true CN209819528U (en) | 2019-12-20 |
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| CN201920044444.3U Active CN209819528U (en) | 2019-01-11 | 2019-01-11 | Biomass boiler multistage air distribution system capable of reducing nitrogen oxides |
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| CN (1) | CN209819528U (en) |
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