CN216480904U - Environment-friendly boiler combustion system - Google Patents
Environment-friendly boiler combustion system Download PDFInfo
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- CN216480904U CN216480904U CN202220799363.6U CN202220799363U CN216480904U CN 216480904 U CN216480904 U CN 216480904U CN 202220799363 U CN202220799363 U CN 202220799363U CN 216480904 U CN216480904 U CN 216480904U
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Abstract
The utility model discloses an environment-friendly boiler combustion system, which comprises a coal storage bin, wherein the coal storage bin is connected with a combustion chamber in a hearth, an inclined hole air distribution device is arranged on the bottom plate in the hearth, the top of the hearth is connected with a material returning device, and the upper part of the material returning device is connected with a tail flue through a central cylinder; be equipped with in the afterbody flue and suspend pipe, high temperature over heater, spray desuperheater, low temperature over heater, economizer and air heater in, the flue gas gets into the afterbody flue through a center section of thick bamboo, through suspending pipe, high temperature over heater, spray and get into denitrification facility behind desuperheater and the low temperature over heater, get into tail gas cleanup unit after denitration treatment behind the economizer and the air heater of afterbody flue once more and discharge by minimum. Carry out the cloth wind and blow the material through inclined hole air distribution device, improve the cloth wind homogeneity, low excess air coefficient operation makes the fuel abundant burning in the furnace to reduce produced nitrogen oxide through denitrification facility, with the emission that reduces nitrogen oxide, be applicable to energy-concerving and environment-protective technical field.
Description
Technical Field
The utility model belongs to the technical field of energy-concerving and environment-protective, specific theory relates to an environment-friendly boiler combustion system.
Background
Atmospheric pollution is one of the main environmental problems faced by China, the emission of various human sources, and the emission of pollutants generated by coal, petroleum, natural gas and biofuel has important influence on the atmospheric environmental quality of regions and regions, which causes immeasurable loss to the life health of people, so that the development of high-efficiency and low-consumption source control and the recovery of waste gas and pollutant resources has important significance for improving the air quality and promoting the environment coordination development.
The main pollutants after the boiler is burnt are particulate matters, sulfur dioxide, oxynitride and the like, and the nitrogen oxide discharged by the coal-fired boiler is one of important sources of atmospheric pollutants, so that the key point of atmospheric treatment is to reduce the discharge of the boiler nitrogen oxide. The nitrogen oxides generated by the combustion of coal-fired boiler fuel mainly come from two aspects: firstly, nitrogen and oxygen in air generate nitrogen oxides at high temperature when coal is combusted; secondly, nitrogen oxides contained in the fuel are thermally decomposed and reoxidized to generate nitrogen oxides in the combustion process. In most combustion plants, the former is the primary source of nitrogen oxides, which are referred to as "thermally reactive nitrogen oxides", the latter as "fuel nitrogen oxides", and also "transient nitrogen oxides", which, when burned, can react with nitrogen-containing atoms in the fuel to reduce NO to NO2, and in fact, in addition to these reactions, NO can react with various nitrogen-containing compounds to form NO 2.
When the reaction reaches chemical equilibrium in practical combustion, the NO2/NO fraction is small, i.e. the NO conversion to NO2 is small and negligible. Therefore, the combustion method and the combustion conditions have great influence on the generation of the nitrogen oxides, so that the combustion technology can be improved, on one hand, the air distribution uniformity at the bottom of the hearth is improved, the whole running air volume is reduced, the excess air coefficient is effectively controlled, the materials at the bottom of the hearth are effectively blown, the materials are fully combusted, and the generation of the nitrogen oxides is reduced; on the other hand, nitrogen oxides are reduced by a catalyst to reduce the generation of nitrogen oxides. Therefore, an environment-friendly boiler combustion system is provided to reduce the emission of nitrogen oxides.
SUMMERY OF THE UTILITY MODEL
The utility model provides an environment-friendly boiler combustion system, through improving combustion technology, through the excess air coefficient of effective control and through nitrogen gas reduction device to reduce nitrogen oxide, reduce the emission of the oxynitride in the air to reduce exhaust pollution to a certain extent.
In order to achieve the above object, the utility model adopts the following technical scheme:
an environment-friendly boiler combustion system comprises a coal storage bin, wherein the coal storage bin is connected with a combustion chamber in a hearth through a coal feeder, a bottom plate in the hearth is uniformly provided with a plurality of inclined hole air distribution devices, a steam pocket is arranged above the hearth, the top of the hearth is connected with a material returning device through a flue, the bottom of the material returning device is connected with the combustion chamber in the hearth through a material returning pipe, and the upper part of the material returning device is connected with a tail flue through a central barrel;
the tail flue is internally provided with a hanging pipe, a high-temperature superheater, a spraying desuperheater, a low-temperature superheater, an economizer and an air preheater from top to bottom in sequence, flue gas enters the tail flue through a central cylinder, enters a denitration device after passing through the hanging pipe, the high-temperature superheater, the spraying desuperheater and the low-temperature superheater, and enters the economizer and the air preheater of the tail flue again after denitration treatment to enter a tail gas purification device.
Furthermore, the denitration device comprises a plurality of nitrogen reduction layers which are arranged up and down, and two ends of each adjacent nitrogen reduction layer are connected with the coal economizer of the tail flue through a guide pipe.
Furthermore, the nitrogen reduction layer is of a herringbone structure, the two sides of the nitrogen reduction layer respectively comprise a plurality of reduction tanks, the reduction tanks are arranged in a vertically staggered mode at intervals, each reduction tank is inclined at an angle with the horizontal plane, a catalytic bed is arranged in each reduction tank, ammonia nozzles are uniformly arranged above the reduction tanks, and the two ends of each reduction tank are connected with the flow guide pipe through flow guide grooves.
Further, the inclined hole air distribution device comprises an inclined hole air cap and an air pipe, the air pipe is connected with a bottom plate in the hearth through threads, the inclined hole air cap is connected with the air pipe through an elastic locking structure, a plurality of air distribution inclined holes are uniformly formed in the side wall of the inclined hole air cap, and ventilation inclined holes are uniformly formed in the side wall of the top of the air pipe.
Furthermore, the air distribution inclined holes are formed in a downward inclined mode, and the ventilation inclined holes are formed in an upward inclined mode.
Further, elasticity locking structure includes the oval-shaped guide cylinder of inner wall, and roof and inclined hole hood inner wall fixed connection are passed through at the top of guide cylinder, and the ring chamber endotheca between guide cylinder and the inclined hole hood is equipped with the spring, and tuber pipe outer wall top is equipped with the oval-shaped limiting plate with guide cylinder inner wall adaptation, offers the swivelling chute with the limiting plate adaptation in the middle of the roof, and the centre bore with the tuber pipe adaptation is offered on upper portion, and the spacing groove with the limiting plate adaptation is offered to the lower part.
Furthermore, the material returning device comprises a cyclone separator, a central cylinder at the top of the cyclone separator is arranged in an eccentric structure, and a discharge hole at the bottom of the cyclone separator is connected with a combustion chamber in the hearth through a material returning pipe.
Furthermore, all be equipped with the water-cooling wall around the furnace, the water-cooling wall includes a plurality of water-cooling pipes of laying perpendicularly on the furnace inner wall, and each water-cooling pipe links to each other with upper and lower header, steam pocket.
Furthermore, the tail gas purification device comprises an electric precipitation cloth bag, a desulfurizing tower, a white eliminating system and a chimney which are sequentially connected through a flue.
The utility model discloses owing to adopted foretell structure, it compares with prior art, and the technical progress who gains lies in:
on one hand, the inclined hole air distribution devices are uniformly arranged on the hearth bottom plate, so that air blown from the bottom of the hearth is blown out obliquely downwards through the air pipes and the inclined hole air caps, materials at the bottom of the hearth are recoiled by the air blown obliquely downwards to participate in combustion, rather than being blown out transversely, insufficient combustion caused by coking of the materials retained at the bottom of the hearth is avoided, the air distribution uniformity is improved, the operation is performed with a low excess air coefficient, so that fuel and air in the hearth are sufficiently combusted, and the generation of nitrogen oxides is reduced; on the other hand, the nitrogen oxide in the flue gas generated by the combustion of the hearth is reduced by the denitration device, so that the emission of the nitrogen oxide is further reduced; in addition, a group of high-temperature superheaters are added to fully absorb the heat energy of the flue gas and improve the quality of the superheated steam.
To sum up, the utility model discloses an improve combustion technology, improve the cloth wind homogeneity of furnace bottom, the excessive air coefficient of effective control, the material fully burns and reduces nitrogen oxide through denitrification facility to reduce the emission of the oxynitride in the air to reduce nitrogen oxide exhaust pollution to a certain extent, be applicable to energy-concerving and environment-protective technical field.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a tail flue in an embodiment of the present invention;
fig. 3 is a schematic structural view of a denitration device in an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a denitration apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural view of an inclined-hole air distribution device in an embodiment of the present invention;
FIG. 6 is a partial cross-sectional view of the inclined hole hood and the duct according to an embodiment of the present invention;
fig. 7 is a schematic structural view of an elastic locking structure in an embodiment of the present invention;
fig. 8 is a schematic structural view of an air duct in an embodiment of the present invention.
Labeling components: 1-coal storage bin, 2-hearth, 3-steam pocket, 4-material returning device, 5-hanging pipe, 6-tail flue, 61-high temperature superheater, 62-spray desuperheater, 63-low temperature superheater, 64-coal economizer, 65-air preheater, 7-denitration device, 71-nitrogen reduction layer, 72-diversion trench, 73-catalytic bed, 74-reduction trench, 75-diversion pipe, 76-ammonia nozzle, 8-electric dust removal cloth bag, 9-desulfurization tower, 10-white elimination system, 11-chimney, 12-coal feeder, 131-inclined hole hood, 1310-air distribution inclined hole, 132-spring, 133-air pipe, 1330-air distribution inclined hole, 1331-limiting plate, 134-guide cylinder, 135-top plate, 1351-rotating groove, 1352-limiting groove, 1353-central hole.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
The utility model discloses an environment-friendly boiler combustion system, as shown in figure 1, including a coal storage bin 1, the coal storage bin 1 is connected with a combustion chamber in a hearth 2 through a coal feeder 12, the bottom plate of the hearth 2 is uniformly provided with a plurality of inclined hole air distribution devices 13, a steam pocket 3 is arranged above the hearth 2, the top of the hearth 2 is connected with a material returning device 4 through a flue, the bottom of the material returning device 4 is connected with the combustion chamber in the hearth 2 through a material returning pipe, and the top of the material returning device 4 is connected with a tail flue 6 through a central cylinder;
the tail flue 6 is internally provided with a hanging pipe 5, a high-temperature superheater 61, a spraying desuperheater 62, a low-temperature superheater 63, an economizer 64 and an air preheater 65 from top to bottom in sequence, as shown in fig. 2, flue gas enters the tail flue through a central cylinder, enters the denitration device 7 after passing through the hanging pipe 5, the high-temperature superheater 61, the spraying desuperheater 62 and the low-temperature superheater 63, and enters the tail gas purification device after entering the economizer 64 and the air preheater 65 of the tail flue again after being subjected to denitration treatment. The furnace 2 is all equipped with the water-cooling wall all around, and the water-cooling wall includes that a plurality of water-cooling pipes of laying perpendicularly on furnace 2 inner wall, each water-cooling pipe and upper and lower collection case, steam pocket 3 link to each other. In addition, the fuel with lower nitrogen content is selected to control the generation of nitrogen oxides in the combustion process from the source.
As a preferred embodiment of the present invention, as shown in fig. 3-4, the denitration device 7 includes a plurality of nitrogen reduction layers 71 disposed up and down, and the two ends of the adjacent nitrogen reduction layers 71 are connected to the economizer 64 in the tail flue 6 through the draft tube 75. The nitrogen reduction layer 71 is of a herringbone structure, the two sides of the nitrogen reduction layer 71 respectively comprise a plurality of reduction tanks 74, the reduction tanks 74 are arranged in a vertically staggered and spaced mode, each reduction tank 74 is obliquely arranged at an angle with the horizontal plane, a catalytic bed 73 is arranged in each reduction tank 74, ammonia is selected as a reducing agent, a metal base and a carbon base are selected as catalysts and laid on the catalytic bed 73, ammonia nozzles 76 are uniformly arranged above the reduction tanks 74, and the two ends of each reduction tank 74 are connected with a flow guide pipe 75 through flow guide grooves 72.
The beneficial effect of this embodiment lies in: by using a selective reduction method, ammonia is selected as a reducing agent, a metal base and a carbon base are selected as catalysts and laid on a catalytic bed 73, the ammonia is sprayed into the flue gas between the economizer 64 and the air preheater through an ammonia gas spray head 76, the mixture of the ammonia and the flue gas passes through the catalytic bed 73, the ammonia and the nitrogen oxides react to generate nitrogen and water vapor, the nitrogen and the water vapor enter the tail flue 6 through the guide pipe 75 and the guide groove 72 and enter the subsequent flue gas purification process, and therefore the reduction of the nitrogen in the nitrogen oxides is realized, and the emission of the nitrogen oxides is reduced.
As a preferred embodiment of the present invention, as shown in fig. 5-8, the inclined hole wind distribution device 13 includes an inclined hole wind cap 131 and a wind pipe 133, the inclined hole wind cap 131 is connected to the wind pipe 133 through an elastic locking structure, the wind pipe 133 is connected to the bottom plate thread in the furnace 2, a plurality of wind distribution inclined holes 1310 are uniformly provided on the side wall of the inclined hole wind cap 131, and a plurality of ventilation inclined holes 1330 are uniformly provided on the top side wall of the wind pipe 133. The air distribution inclined hole 1310 is formed in a downward inclined manner, and the ventilation inclined hole 1330 is formed in an upward inclined manner. Specifically, the number of the ventilation inclined holes 1330 and the number of the air distribution inclined holes 1310 are 9. The elastic locking structure comprises a guide cylinder 134 with an oval inner wall, the top of the guide cylinder 134 is fixedly connected with the inner wall of the inclined hole blast cap through a top plate 135, a spring 132 is sleeved in an annular cavity between the guide cylinder 134 and the inclined hole blast cap 131, an oval limiting plate 1331 matched with the inner wall of the guide cylinder 134 is arranged at the top of the outer wall of the air pipe 133, a rotating groove 1351 matched with the limiting plate 1331 is formed in the middle of the top plate 135, a central hole 1353 matched with the air pipe 133 is formed in the upper part of the top plate 135, and a limiting groove 1352 matched with the limiting plate 1331 is formed in the lower part of the top plate 135.
The beneficial effect of this embodiment lies in: through evenly setting up a plurality of inclined hole air distribution device 13 at the furnace bottom plate, make the wind that 2 bottoms of furnace blown out blow out through tuber pipe 133 and inclined hole hood 131 syncline below, the material that makes 2 bottoms of furnace is got up the participation burning by the wind recoil that the below was blown out to syncline, rather than transversely blowing out, the material coking of avoiding 2 bottoms of furnace to be detained leads to the burning insufficient, improve the air distribution homogeneity, low excess air coefficient operation, make the abundant burning of fuel and air in 2 furnace, reduce nitrogen oxide's formation.
In addition, in the prior art, the blast cap is usually fixed at the bottom of the furnace 2 by welding, and in the long-term use process, the phenomenon of loosening or falling off often occurs, which affects the uniformity of air distribution and is inconvenient to detach and install, in the embodiment, the air pipe 133 is firstly installed at the bottom of the furnace 2 by threads, then the inclined hole blast cap 131 is buckled above the air pipe 133, the limiting plate 1331 is aligned with the guide cylinder 134, downward pressure is applied to the inclined hole blast cap 131, meanwhile, the inclined hole blast cap 131 continuously compresses the spring 132 until the top plate 135 of the inclined hole blast cap 131 reaches the rotating groove 1351 and cannot move continuously, then the inclined hole blast cap 131 rotates 90 degrees, the limiting plate 1331 is positioned right above the position of the limiting groove 1352, then the inclined hole blast cap 131 is loosened, the inclined hole blast cap 1331 is clamped in the limiting groove 1352 under the counter-acting force of the spring 132, on one hand, the effective positioning of the inclined hole blast cap 131 is realized, on the other hand, play locking effect to tuber pipe 133, for the welded fastening mode, do not need welding equipment and welding process, its installation and dismantlement are more in the aspect of, and the condition that can not appear becoming flexible or drop appears, guarantee that inclined hole hood 131 reliably and evenly distributes wind.
As a preferred embodiment of the present invention, the material returning device 4 comprises a cyclone separator, the central cylinder at the top of the cyclone separator adopts an eccentric structure, and the discharge port at the bottom of the cyclone separator is connected with the combustion chamber in the furnace 2 through a material returning pipe. The original central cylinder is changed into an eccentric type, the combustion temperature is controlled by staged combustion, the material circulation rate is increased, the combustion time of combustible materials in a flame front peak and a reaction zone is increased, and the purpose that the materials in the hearth 2 are sufficiently circulated to participate in secondary combustion is achieved.
As a preferred embodiment of the present invention, the tail gas purification device comprises an electric dust removal cloth bag 8, a desulfurizing tower 9, a white eliminating system 10 and a chimney 11 which are sequentially connected through a flue. Carry out many-sided purification back discharge to tail gas through tail gas cleanup unit and reach standard, further reduce the pollution of flue gas to the environment.
To sum up, the utility model discloses an improve combustion technology, improve the cloth wind homogeneity of furnace bottom, the excessive air coefficient of effective control, the material fully burns and reduces nitrogen oxide through denitrification facility to reduce the emission of the oxynitride in the air to reduce nitrogen oxide exhaust pollution to a certain extent, be applicable to energy-concerving and environment-protective technical field.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the protection of the claims of the present invention.
Claims (9)
1. The utility model provides an environment-friendly boiler combustion system which characterized in that: the coal storage bin is connected with a combustion chamber in a hearth through a coal feeder, a plurality of inclined hole air distribution devices are uniformly arranged on a bottom plate in the hearth, a steam pocket is arranged above the hearth, the top of the hearth is connected with a material returning device through a flue, the bottom of the material returning device is connected with the combustion chamber in the hearth through a material returning pipe, and the upper part of the material returning device is connected with a tail flue through a central barrel;
the tail flue is internally provided with a hanging pipe, a high-temperature superheater, a spraying desuperheater, a low-temperature superheater, an economizer and an air preheater from top to bottom in sequence, flue gas enters the tail flue through a central cylinder, enters a denitration device after passing through the hanging pipe, the high-temperature superheater, the spraying desuperheater and the low-temperature superheater, and enters the economizer and the air preheater of the tail flue again after denitration treatment to enter a tail gas purification device.
2. The environment-friendly boiler combustion system of claim 1, wherein: the denitration device comprises a plurality of nitrogen reduction layers which are arranged up and down, and two ends of each adjacent nitrogen reduction layer are connected with the coal economizer of the tail flue through the guide pipe.
3. The environment-friendly boiler combustion system of claim 2, wherein: the nitrogen reduction layer is of a herringbone structure, the two sides of the nitrogen reduction layer respectively comprise a plurality of reduction grooves, the reduction grooves are arranged in an up-and-down staggered mode at intervals, each reduction groove is inclined at an angle with the horizontal plane, a catalytic bed is arranged in each reduction groove, ammonia nozzles are uniformly arranged above the reduction grooves, and the two ends of each reduction groove are connected with the flow guide pipe through flow guide grooves.
4. The environment-friendly boiler combustion system of claim 1, wherein: the inclined hole air distribution device comprises an inclined hole air cap and an air pipe, the air pipe is connected with a bottom plate thread in the hearth, the inclined hole air cap is connected with the air pipe through an elastic locking structure, a plurality of air distribution inclined holes are uniformly formed in the side wall of the inclined hole air cap, and ventilation inclined holes are uniformly formed in the side wall of the top of the air pipe.
5. The environment-friendly boiler combustion system of claim 4, wherein: the air distribution inclined holes are formed in a downward inclined mode, and the ventilation inclined holes are formed in an upward inclined mode.
6. The environment-friendly boiler combustion system of claim 4, wherein: the elastic locking structure comprises an inner wall oval guide cylinder, the top of the guide cylinder is fixedly connected with the inner wall of an inclined hole hood through a top plate, a spring is sleeved in an annular cavity between the guide cylinder and the inclined hole hood, the top of the air pipe outer wall is provided with an oval limiting plate matched with the inner wall of the guide cylinder, a rotating groove matched with the limiting plate is formed in the middle of the top plate, the upper portion of the rotating groove is provided with a center hole matched with the air pipe, and the lower portion of the rotating groove is provided with a limiting groove matched with the limiting plate.
7. The environment-friendly boiler combustion system of claim 1, wherein: the material returning device comprises a cyclone separator, a central cylinder at the top of the cyclone separator is arranged in an eccentric structure, and a discharge hole at the bottom of the cyclone separator is connected with a combustion chamber in the hearth through a material returning pipe.
8. The environment-friendly boiler combustion system of claim 1, wherein: the furnace is characterized in that water-cooled walls are arranged around the furnace, each water-cooled wall comprises a plurality of water-cooled tubes vertically paved on the inner wall of the furnace, and each water-cooled tube is connected with the upper header and the lower header and the steam pocket.
9. The environment-friendly boiler combustion system of claim 1, wherein: the tail gas purification device comprises an electric precipitation cloth bag, a desulfurizing tower, a white eliminating system and a chimney which are sequentially connected through a flue.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220799363.6U CN216480904U (en) | 2022-04-08 | 2022-04-08 | Environment-friendly boiler combustion system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220799363.6U CN216480904U (en) | 2022-04-08 | 2022-04-08 | Environment-friendly boiler combustion system |
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| CN216480904U true CN216480904U (en) | 2022-05-10 |
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| CN202220799363.6U Active CN216480904U (en) | 2022-04-08 | 2022-04-08 | Environment-friendly boiler combustion system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115676865A (en) * | 2022-09-14 | 2023-02-03 | 中铝矿业有限公司 | Device and method for reducing fuel consumption and nitrogen oxide emission of suspension roaster |
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2022
- 2022-04-08 CN CN202220799363.6U patent/CN216480904U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115676865A (en) * | 2022-09-14 | 2023-02-03 | 中铝矿业有限公司 | Device and method for reducing fuel consumption and nitrogen oxide emission of suspension roaster |
| CN115676865B (en) * | 2022-09-14 | 2024-04-09 | 中铝矿业有限公司 | Device and method for reducing fuel consumption and discharge of oxynitride in suspension roasting furnace |
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