CN211976866U - Device for increasing inlet temperature of CFB boiler separator - Google Patents
Device for increasing inlet temperature of CFB boiler separator Download PDFInfo
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- CN211976866U CN211976866U CN202020492791.5U CN202020492791U CN211976866U CN 211976866 U CN211976866 U CN 211976866U CN 202020492791 U CN202020492791 U CN 202020492791U CN 211976866 U CN211976866 U CN 211976866U
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Abstract
The utility model discloses a device for improving the temperature of the inlet of a CFB boiler separator, which comprises a combustion chamber and a feeding device; the combustion chamber is arranged below the horizontal flue of the separator, and the top of the combustion chamber is communicated with the horizontal flue of the separator; the feeding device comprises a blanking pipe and a seeding air pipeline, the blanking pipe is arranged on the side surface of the combustion chamber, the outlet of the blanking pipe faces the inner side of the combustion chamber, the inlet of the blanking pipe is communicated with the outlet of the feeding device, the blanking pipe is communicated with the seeding air pipeline, and the combustion area of the combustion chamber is provided with a temperature measuring device; the bottom of the combustion chamber is provided with an air distribution device which is communicated with a fluidized fan; the fuel burns at the combustion chamber, and the heat is continuously exported to the flue of separator from the combustion chamber in, improves the temperature of separator entry, helps keeping the temperature of separator entry to keep at SNCR reaction window temperature moreover, improves SNCR reaction efficiency, reduces the consumption of SNCR reductant, and the export of blanking pipe is inside towards the combustion chamber, is favorable to directly carrying the fuel to the combustion area.
Description
Technical Field
The utility model belongs to the technical field of circulating fluidized bed boiler, concretely relates to improve device of CFB boiler separator inlet temperature.
Background
The Circulating Fluidized Bed (CFB) boiler commonly adopts an SNCR mode to remove NOx in flue gas, the temperature window of an SNCR reaction is 850-1050 ℃, and the CFB boiler is characterized in that a cyclone separator is just in the temperature window of the SNCR reaction, so that the SNCR denitration efficiency is high and can reach about 80% at most. However, with the surplus of domestic power production in recent years, the number of operating hours of the thermal power plant unit is reduced year by year, the boiler is under the low-load operating condition for a long time, and the temperature in the CFB boiler reactor is below 850 ℃ during low-load operation, and even lower temperature is below 700 ℃. On one hand, the reduction of the temperature of the separator causes the reduction of the SNCR denitration efficiency, even the reaction is stopped, the environmental-friendly emission exceeds the standard, and the enterprise image is influenced; on the other hand, the reduction of the reaction efficiency leads to a great increase in the consumption of the reducing agent, and the denitration operation cost is greatly increased. The problem that low-load NOx of a CFB boiler exceeds the standard is the first problem that whether a thermal power plant can smoothly participate in peak regulation, at present, an effective means is still not available for solving the problem, and an SCR denitration facility is added to some power plants, so that huge capital investment is needed; some power plants are added with strong oxidant denitration facilities, but the technology has large side effect and is forbidden to be used in certain regions. The technology that can control SNCR reactor temperature stability will make SNCR denitration comprehensive efficiency improve by a wide margin, reduces the denitration cost of CFB boiler.
SUMMERY OF THE UTILITY MODEL
To the problem among the prior art, the utility model provides an improve device of CFB boiler separator inlet temperature, its aim at reduces when boiler load, and separator inlet temperature is less than the SNCR reaction window temperature when, through dropping into the device operation, improves separator inlet temperature, improves SNCR denitration reaction efficiency.
In order to achieve the purpose, the technical scheme adopted by the utility model is that the device for improving the temperature of the inlet of the separator of the CFB boiler comprises a combustion chamber and a feeding device; the combustion chamber is arranged below the horizontal flue of the separator, and the top of the combustion chamber is communicated with the horizontal flue of the separator; the feeding device comprises a blanking pipe and a seeding air pipeline, the blanking pipe is arranged on the side surface of the combustion chamber, the outlet of the blanking pipe faces the inner side of the combustion chamber, the inlet of the blanking pipe is communicated with the outlet of the feeding device, the blanking pipe is communicated with the seeding air pipeline, and the combustion area of the combustion chamber is provided with a temperature measuring device; the bottom of the combustion chamber is provided with an air distribution device and a slag dropping pipe, the slag dropping pipe is communicated with the outside of the combustion chamber, and the air distribution device is communicated with a fluidization fan.
The feeding device adopts a coal feeder, and a discharge port of the coal feeder is connected with a blanking pipe through a conveying pipeline.
The inlet of the slag falling pipe is arranged at the horizontal center of the air distribution device, and the outlet of the slag falling pipe is communicated with a slag cooler.
The blanking pipe is obliquely inserted into the combustion chamber, is made of high-temperature-resistant metal, and is connected with the material spreading air pipeline at the upper end.
The combustion chamber adopts the steel sheet welding all around, and the inner wall of combustion chamber sets up first heat preservation and first flame retardant coating, and the supplementary fixed first heat preservation of nail and first flame retardant coating are grabbed in the welding of steel sheet medial surface.
An air chamber is arranged below the air distribution device, the air chamber is communicated with the air distribution device, and a second heat insulation layer and a second fire-resistant layer are arranged above the air distribution device.
The air chamber is provided with a pressure measuring device and is communicated with a fluidizing air pipeline, and the fluidizing air pipeline is provided with a regulating valve.
Compared with the prior art, the utility model discloses following beneficial effect has at least: the fuel is combusted in the combustion chamber, heat is continuously output from the combustion chamber to a flue of the separator, the temperature of an inlet of the separator is improved, the temperature of the inlet of the separator is kept at the temperature of an SNCR reaction window, the SNCR reaction efficiency is improved, the consumption of an SNCR reducing agent is reduced, a blanking pipe is communicated with a material sowing air pipeline, an outlet of the blanking pipe faces the inner side of the combustion chamber, the fuel is directly conveyed to the combustion zone, and a temperature measuring device arranged in the combustion zone can reflect the real-time temperature of the combustion chamber and provide temperature parameters for operation; the required auxiliary assembly of this device is few, the device can regard as the hierarchical apparatus of oxygen supply of boiler simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall arrangement of the device of the present invention in a CFB boiler.
Fig. 2 is a schematic cross-sectional view of an embodiment of the device of the present invention.
Fig. 3 is a schematic cross-sectional view of another embodiment of the device of the present invention.
Fig. 4 is a bottom schematic view of an embodiment of the apparatus of the present invention.
In the attached drawings, 1-hearth; 2-a combustion chamber; 3-a separator; 4-slag cooler; 5-a fluidization fan; 6-hearth coal feeder; 7-a coal feeder; 201-steel plate; 202-a first insulating layer; 203-a first refractory layer; 204-a grab nail; 205-a plenum; 206-a slag falling pipe; 207-a second insulating layer; 208-a second refractory layer; 209-blast cap; 210-a pressure measuring device; 211-temperature measuring means; 212-a fluidizing air duct; 213-a down pipe; 214-a seeding air duct; 215-a delivery conduit; 216-air distribution device, 217-adjusting valve.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The device for improving the inlet temperature of the separator of the CFB boiler comprises a combustion chamber 2 and a feeding device; the combustion chamber 2 is arranged below the horizontal flue of the separator, and the top of the combustion chamber 2 is communicated with the horizontal flue of the separator; the feeding device comprises a blanking pipe 213 and a seeding air pipeline 214, the blanking pipe 213 is arranged on the side surface of the combustion chamber 2, the outlet of the blanking pipe 213 faces the inner side of the combustion chamber 2, the inlet of the blanking pipe 213 is communicated with the outlet of the feeding device, the blanking pipe 213 is communicated with the seeding air pipeline 214, and the combustion area of the combustion chamber 2 is provided with a temperature measuring device 211; the bottom of the combustion chamber 2 is provided with an air distribution device 216 and a slag dropping pipe 206, the slag dropping pipe 206 is communicated with the outside of the combustion chamber, and the air distribution device 216 is communicated with a fluidization fan 5.
The feeding device adopts a coal feeder 7, and a discharge port of the coal feeder 7 is connected with a blanking pipe 213 through a conveying pipeline 215.
The inlet of the slag falling pipe 206 is arranged at the horizontal center of the air distribution device 216, and the outlet of the slag falling pipe 206 is communicated with the slag cooler 4.
The blanking pipe 213 is obliquely inserted into the combustion chamber 2, the blanking pipe 213 is made of high temperature resistant metal, and the upper end of the blanking pipe 213 is connected with the seeding air pipe 214.
Referring to fig. 1 to 4, a device for increasing the inlet temperature of a low-load separator of a CFB boiler is arranged between a furnace 1 and a separator 3 of the CFB boiler, is arranged below an inlet flue of each separator, and is communicated with a horizontal section flue of the separator; comprising a combustion chamber 2 and a down pipe 213; the bottom of the combustion chamber 2 is provided with an air distribution device 216 and a slag dropping pipe 206, the inlet of the slag dropping pipe 206 is arranged at the horizontal center of the air distribution device 216, the side surface of the combustion chamber 2 is provided with a blanking pipe, the outlet of the blanking pipe 213 faces the inner side of the combustion chamber 2, the blanking pipe 213 is communicated with a material spreading air pipeline 214 and a feeding device, the inlet of the air distribution device is communicated with a fluidized fan 5, the slag dropping pipe 206 is communicated with a slag cooler 4, and the combustion area of the combustion chamber 2 is provided with a temperature measuring device 211.
The feeding device adopts a coal feeder 7, and the coal feeder 7 is connected with a blanking pipe 213 through a conveying pipeline 215;
as shown in fig. 2 and fig. 3, the combustion chamber 2 is welded with steel plates 201 all around, the inner wall of the combustion chamber 2 is provided with a first heat-insulating layer and a first flame retardant coating, the welding nails 204 are welded on the inner side surface of the steel plates 201 to assist in fixing the first heat-insulating layer 202 and the first flame retardant coating 203, the first heat-insulating layer 202 is laid with heat-insulating plastic materials, and the first flame retardant coating 203 is laid with flame-retardant plastic materials.
The combustion chamber is arranged below the horizontal flue of the separator, and the top of the combustion chamber is communicated with the horizontal flue. An air chamber 205 is arranged below the combustion chamber 2, the air chamber 205 is communicated with an air distribution device 216, a second insulating layer 207 and a second flame retardant coating 208 are arranged on the air distribution device 216, the second insulating layer 207 is laid by adopting insulating castable, the second flame retardant coating 208 is laid by adopting flame retardant castable, and air flow enters the air distribution device 216 from the air chamber 205 and then enters the combustion chamber 2.
The air chamber 205 is arranged at the lower part of the combustion chamber 2, the air chamber 205 and the combustion chamber 2 are separated by an air distribution device 216, air flow enters the combustion chamber 2 from the air chamber 205 through the air distribution device 216, and the heat preservation castable 207 and the refractory castable 208 are sequentially poured at the upper part of the air distribution device 216.
The blanking pipe 213 obliquely enters the combustion chamber 2, the discharge port of the blanking pipe 213 is close to the center of the combustion chamber 2, and the blanking pipe 213 is made of high-temperature-resistant metal and is welded and fixed with the steel plate 201; the upper end of the blanking pipe 213 is connected with a seeding air pipeline 214, and fuel is sowed into the combustion chamber 2 through the blanking pipe 213 by seeding air;
the periphery of the combustion chamber 2 is formed by welding steel plates 201, the combustion chamber is arranged below the horizontal flue of the separator and connected with the bottom of the horizontal flue, and the combustion chamber is not provided with a top cover and is communicated with the horizontal flue.
The blanking pipe 213 is obliquely inserted into the combustion chamber 2, the blanking pipe 213 is made of high temperature resistant metal and welded with the steel plate 201 outside the combustion chamber, the upper end of the blanking pipe 213 is connected with a material spreading air pipe 214, and fuel is spread into the combustion chamber 2 through the blanking pipe 213 by coal spreading air.
The slag falling pipe 206 is arranged at the intersection point of the longitudinal and transverse center lines of the air distribution device 216, the lower end of the slag falling pipe 216 is connected with the boiler slag cooler 4, and slag particles in the combustion chamber 2 are discharged through the slag falling pipe 206.
A method for improving the inlet temperature of a low-load separator of a CFB boiler is based on a device for improving the inlet temperature of the low-load separator of the CFB boiler, when the load of the boiler is reduced and the temperature of the separator is lower than that of a SNCR reaction window greenhouse, a coal feeder 7 of the device is started, solid fuel entering a combustion chamber 2 automatically combusts under the action of high-temperature flue gas, meanwhile, heat is blown to a horizontal flue by an air chamber 205 to enter a separator 3, the temperature of the separator is increased, and meanwhile, the coal feeding amount of a hearth is reduced. This process transfers a portion of the boiler heat from the furnace 1 to the separator 3, raising the SNCR reactor temperature.
When the boiler is started, the fluidizing fan 5 is started before the primary fan is started, and the pressure of the air chamber 205 is kept above 10 kPa; when the boiler is shut down, the vulcanizing fan 5 is shut down after the primary fan is shut down, so that circulating ash can be effectively prevented from entering the air chamber 205 from the horizontal flue.
The air quantity entering the combustion chamber 2 can be adjusted by an adjusting door 217 arranged on the fluidized air pipeline 212, so that the solid fuel entering the combustion chamber 2 is in a fluidized state.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. An apparatus for increasing the inlet temperature of a separator of a CFB boiler is characterized by comprising a combustion chamber (2) and a feeding device; the combustion chamber (2) is arranged below the horizontal flue of the separator, and the top of the combustion chamber (2) is communicated with the horizontal flue of the separator; the feeding device comprises a blanking pipe (213) and a seeding air pipeline (214), the blanking pipe (213) is arranged on the side surface of the combustion chamber (2), the outlet of the blanking pipe (213) faces the inner side of the combustion chamber (2), the inlet of the blanking pipe (213) is communicated with the outlet of the feeding device, the blanking pipe (213) is communicated with the seeding air pipeline (214), and the combustion area of the combustion chamber (2) is provided with a temperature measuring device (211); the bottom of the combustion chamber (2) is provided with an air distribution device (216) and a slag falling pipe (206), the slag falling pipe (206) is communicated with the outside of the combustion chamber, and the air distribution device (216) is communicated with a fluidization fan (5).
2. An arrangement for increasing the inlet temperature of a separator of a CFB boiler as set forth in claim 1, characterized in that the feeding means is a coal feeder (7), and the outlet of the coal feeder (7) is connected to the down pipe (213) through a feed delivery pipe (215).
3. An arrangement for increasing the inlet temperature of a separator of a CFB boiler, according to claim 2, characterized in that the inlet of the slag dropping pipe (206) is arranged at the horizontal center of the air distribution device (216), and the outlet of the slag dropping pipe (206) is communicated with the slag cooler (4).
4. An apparatus for increasing the inlet temperature of a separator of a CFB boiler, as defined in claim 2, wherein the down pipe (213) is inserted obliquely into the combustion chamber (2), the down pipe (213) is made of a refractory metal, and the upper end of the down pipe (213) is connected to the feed air duct (214).
5. The device for improving the inlet temperature of the CFB boiler separator according to claim 1, wherein the periphery of the combustion chamber (2) is welded by using a steel plate (201), a first heat-insulating layer and a first flame retardant coating are arranged on the inner wall of the combustion chamber (2), and a grabbing nail (204) is welded on the inner side surface of the steel plate (201) to assist in fixing the first heat-insulating layer (202) and the first flame retardant coating (203).
6. An apparatus for increasing the inlet temperature of a separator of a CFB boiler, according to claim 1, wherein the air chamber (205) is arranged below the air distribution device (216), the air chamber (205) is communicated with the air distribution device (216), and the second insulating layer (207) and the second fire-resistant layer (208) are arranged above the air distribution device (216).
7. An apparatus for increasing the inlet temperature of a separator of a CFB boiler, according to claim 6, wherein the plenum (205) is provided with a pressure measuring device (210), the plenum (205) is communicated with a fluidizing air duct (212), and the fluidizing air duct (212) is provided with a regulating valve (217).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020492791.5U CN211976866U (en) | 2020-04-07 | 2020-04-07 | Device for increasing inlet temperature of CFB boiler separator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020492791.5U CN211976866U (en) | 2020-04-07 | 2020-04-07 | Device for increasing inlet temperature of CFB boiler separator |
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| Publication Number | Publication Date |
|---|---|
| CN211976866U true CN211976866U (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020492791.5U Active CN211976866U (en) | 2020-04-07 | 2020-04-07 | Device for increasing inlet temperature of CFB boiler separator |
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| CN (1) | CN211976866U (en) |
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- 2020-04-07 CN CN202020492791.5U patent/CN211976866U/en active Active
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Inventor after: Li Nan Inventor after: Shi Lei Inventor after: Cheng Wenfeng Inventor after: Shi Bin Inventor after: Yu Wugao Inventor after: Liu Jian Inventor after: But Zhenyu Inventor after: Zhao Pengbo Inventor after: Liu Haifeng Inventor after: Zhang Shixin Inventor before: Li Nan Inventor before: Shi Lei Inventor before: Cheng Wenfeng Inventor before: Shi Bin Inventor before: Yu Wugao Inventor before: Liu Jian Inventor before: But Zhenyu Inventor before: Zhao Pengbo Inventor before: Liu Haifeng Inventor before: Zhang Shixin |