CN220657068U - Dilution air heating structure for SCR denitration pyrolysis furnace - Google Patents
Dilution air heating structure for SCR denitration pyrolysis furnace Download PDFInfo
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- CN220657068U CN220657068U CN202322032113.7U CN202322032113U CN220657068U CN 220657068 U CN220657068 U CN 220657068U CN 202322032113 U CN202322032113 U CN 202322032113U CN 220657068 U CN220657068 U CN 220657068U
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 33
- 239000012895 dilution Substances 0.000 title claims abstract description 17
- 238000010790 dilution Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 title claims abstract description 15
- 238000005485 electric heating Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The utility model discloses a dilution air heating structure for an SCR denitration pyrolysis furnace, which belongs to the field of pyrolysis furnaces, and comprises a boiler flue, wherein the boiler flue is provided with an in-furnace heat exchanger, two ends of the in-furnace heat exchanger are provided with an air inlet pipe and an air outlet pipe, the air inlet direction on the air inlet pipe is connected with an external air inlet pipe, and a fan is arranged on the external air inlet pipe; an external air outlet channel is connected to the air outlet direction on the air outlet pipe, a pyrolysis furnace is connected to the external air outlet channel, and an electric heater is arranged on the external air outlet channel in front of the pyrolysis furnace; the air outlet end of the external air inlet channel is also communicated with an adjusting air channel, an electric control adjusting valve is arranged on the adjusting air channel, the adjusting air channel is connected with the air inlet pipe in parallel, and the other end of the adjusting air channel is communicated with the external air outlet channel; the air conditioner further comprises a temperature detection device and a controller, wherein the temperature detection device is arranged on the air outlet pipe, and the controller is connected with the temperature detection device, the electric control regulating valve and the electric heating device. Through the structure, electric energy can be saved, and meanwhile, the temperature of dilution air is guaranteed to meet the operation requirement of the pyrolysis furnace.
Description
Technical Field
The utility model relates to the field of pyrolysis furnaces, in particular to a dilution air heating structure for an SCR denitration pyrolysis furnace.
Background
Pyrolysis furnaces are important equipment in boiler flue gas SCR denitration systems. The main function of the method is to pyrolyze the sprayed urea solution under the action of high-temperature air, so as to generate the reducing agent ammonia for denitration. At present, the main stream technology heats air by an electric heater to obtain high-temperature air, and the power consumption is serious.
Although a mode of heating air through heat exchange of boiler tail gas to obtain high temperature appears in the market at present, in a specific heat exchange process, interference factors of the heat exchanger are relatively large, and the use requirement of the pyrolysis furnace can be met only when the high-temperature air is heated to 500-600 ℃, so that the use of the pyrolysis furnace is influenced by the improved mode although electricity is saved.
Aiming at the problems in the prior art, the utility model designs and manufactures a dilution air heating structure for an SCR denitration pyrolysis furnace to overcome the defects.
Disclosure of Invention
For the problems in the prior art, the dilution air heating structure for the SCR denitration pyrolysis furnace provided by the utility model can save electric energy and ensure that the temperature of the dilution air meets the use requirement of the pyrolysis furnace.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the dilution air heating structure for the SCR denitration pyrolysis furnace comprises a boiler flue, wherein an economizer is arranged in the boiler flue, an in-furnace heat exchanger is arranged in the boiler flue at the front end of the economizer, air inlet pipes and air outlet pipes are arranged at two ends of the in-furnace heat exchanger, and the air inlet pipes and the air outlet pipes extend out of the boiler flue;
an external air inlet channel is connected to the air inlet direction on the air inlet pipe, and a fan is arranged on the external air inlet channel;
an external air outlet channel is connected to the air outlet direction on the air outlet pipe, a pyrolysis furnace is connected to the external air outlet channel, and an electric heater is arranged on the external air outlet channel in front of the pyrolysis furnace;
the air outlet end of the external air inlet channel is also communicated with an adjusting air channel, an electric control adjusting valve is arranged on the adjusting air channel, the adjusting air channel is connected with the air inlet pipe in parallel, and the other end of the adjusting air channel is communicated with the external air outlet channel;
the air outlet pipe is provided with an air outlet pipe, the air outlet pipe is connected with an electric control adjusting valve, and the electric heating device is connected with the air outlet pipe.
Preferably, the air inlet pipe is provided with an air inlet valve, and the air outlet pipe is provided with an air outlet valve.
Preferably, the fans externally connected with the air inlet duct comprise two fans which are arranged in parallel, and the air outlet of each fan is respectively provided with a blowing valve.
Preferably, an auxiliary adjusting air duct is further arranged on one side of the adjusting air duct, the auxiliary adjusting air duct is arranged in parallel with the adjusting air duct, an auxiliary electric control adjusting valve is arranged on the auxiliary adjusting air duct, the auxiliary electric control adjusting valve is a normally closed valve, and the auxiliary electric control adjusting valve is connected with the controller.
Preferably, the heat receiving pipe of the heat exchanger in the furnace is a high-temperature-resistant seamless steel pipe.
The utility model has the advantages that:
1. according to the utility model, the opening of the electric control regulating valve is reasonably regulated according to the temperature acquired by the temperature detecting device by arranging the regulating air duct, so that unheated natural wind can be mixed with high-temperature air, the temperature of the air entering the external air outlet duct is reduced, and similarly, if the electric heater can heat the low-temperature air, the temperature entering the pyrolysis furnace is ensured to be stable between 500 and 600 ℃.
2. Through the structure, the utility model not only saves electric energy, but also ensures that the temperature of the dilution wind is stable and meets the use requirement of the pyrolysis furnace.
Drawings
Fig. 1 is a schematic diagram of a dilution air heating structure for an SCR denitration pyrolysis furnace.
In the figure: 1-boiler flue, 2-economizer, 3-heat exchanger in the stove, 4-air-out pipe, 5-air-in pipe, 6-external air inlet duct, 7-blast valve, 8-fan, 9-automatically controlled governing valve, 10-supplementary automatically controlled governing valve, 11-regulating wind channel, 12-supplementary regulating wind channel, 13-air inlet valve, 14-air-out valve, 15-external air outlet duct, 16-electric heater, 17-pyrolysis oven.
Detailed Description
The present utility model is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
As shown in fig. 1, the dilution air heating structure for the SCR denitration pyrolysis furnace comprises a boiler flue 1, wherein an economizer 2 is arranged in the boiler flue 1, an in-furnace heat exchanger 3 is arranged in the boiler flue 1 at the front end of the economizer 2, heated pipes of the in-furnace heat exchanger 3 are high-temperature-resistant seamless steel pipes, two ends of the in-furnace heat exchanger 3 are provided with an air inlet pipe 5 and an air outlet pipe 4, the air inlet pipe 5 and the air outlet pipe 4 extend out of the boiler flue 1, an air inlet valve 13 is arranged on the air inlet pipe 5, and an air outlet valve 14 is arranged on the air outlet pipe 4;
the air inlet direction of the air inlet pipe 5 is connected with an external air inlet pipe 6, and a fan 8 is arranged on the external air inlet pipe 6. An external air outlet duct 15 is connected to the air outlet direction of the air outlet duct 4, a pyrolysis furnace 17 is connected to the external air outlet duct 15, and an electric heater 16 is arranged on the external air outlet duct 15 in front of the pyrolysis furnace 17;
the air outlet end of the external air inlet duct 6 is also communicated with an adjusting air duct 11, an electric control adjusting valve 9 is arranged on the adjusting air duct 11, the adjusting air duct 11 is arranged in parallel with the air inlet duct 5, the other end of the adjusting air duct 11 is communicated with the external air outlet duct 15, the air outlet duct further comprises a temperature detecting device and a controller, the temperature detecting device is arranged on the air outlet duct 4 and can detect the air outlet temperature of the air outlet duct 4, the temperature detecting device is connected with the controller, and the controller is connected with the electric control adjusting valve 9 and the electric heating device.
The utility model reasonably adjusts the opening of the electric control regulating valve 9 according to the temperature acquired by the temperature detecting device by arranging the regulating air duct 11, thereby mixing unheated natural wind with high-temperature air, reducing the temperature of the air entering the external air outlet duct, and likewise, if the electric heater 16 can heat the low-temperature air, ensuring the temperature entering the pyrolysis furnace 17 to be stable between 500 and 600 DEG C
The fans 8 externally connected with the air inlet duct 6 comprise two fans 8 which are arranged in parallel, and the air outlet of each fan 8 is respectively provided with a blowing valve 7, and only one fan needs to be started and the other fan needs to be used for standby during actual work.
The auxiliary adjusting air duct 12 is further arranged on one side of the adjusting air duct 11, the auxiliary adjusting air duct 12 is arranged in parallel with the adjusting air duct 11, the auxiliary electric control adjusting valve 10 is arranged on the auxiliary adjusting air duct 12, the auxiliary electric control adjusting valve 10 is a normally closed valve, the auxiliary electric control adjusting valve 10 is connected with the controller, the auxiliary adjusting air duct 12 and the auxiliary electric control adjusting valve 10 play a standby role in the position, and when the electric control adjusting valve 9 on the adjusting air duct 11 fails, the auxiliary electric control adjusting valve can be started in time, and normal operation of work is guaranteed.
It should be understood that these examples are for the purpose of illustrating the utility model only and are not intended to limit the scope of the utility model. Furthermore, it is to be understood that various changes, modifications and/or variations may be made by those skilled in the art after reading the technical content of the present utility model, and that all such equivalents are intended to fall within the scope of protection defined in the claims appended hereto.
Claims (5)
1. The dilution air heating structure for the SCR denitration pyrolysis furnace is characterized by comprising a boiler flue, wherein an economizer is arranged in the boiler flue, an in-furnace heat exchanger is arranged in the boiler flue at the front end of the economizer, air inlet pipes and air outlet pipes are arranged at two ends of the in-furnace heat exchanger, and both the air inlet pipes and the air outlet pipes extend out of the boiler flue;
an external air inlet channel is connected to the air inlet direction on the air inlet pipe, and a fan is arranged on the external air inlet channel;
an external air outlet channel is connected to the air outlet direction on the air outlet pipe, a pyrolysis furnace is connected to the external air outlet channel, and an electric heater is arranged on the external air outlet channel in front of the pyrolysis furnace;
the air outlet end of the external air inlet channel is also communicated with an adjusting air channel, an electric control adjusting valve is arranged on the adjusting air channel, the adjusting air channel is connected with the air inlet pipe in parallel, and the other end of the adjusting air channel is communicated with the external air outlet channel;
the air outlet pipe is provided with an air outlet pipe, the air outlet pipe is connected with an electric control adjusting valve, and the electric heating device is connected with the air outlet pipe.
2. The dilution air heating structure for the SCR denitration pyrolysis furnace according to claim 1, wherein an air inlet valve is arranged on the air inlet pipe, and an air outlet valve is arranged on the air outlet pipe.
3. The dilution air heating structure for the SCR denitration pyrolysis furnace according to claim 1, wherein the fans externally connected with the air inlet duct comprise two fans which are arranged in parallel, and an air outlet of each fan is respectively provided with an air blowing valve.
4. The dilution air heating structure for the SCR denitration pyrolysis furnace according to claim 1, wherein an auxiliary adjusting air duct is further arranged on one side of the adjusting air duct, the auxiliary adjusting air duct is arranged in parallel with the adjusting air duct, an auxiliary electric control adjusting valve is arranged on the auxiliary adjusting air duct, the auxiliary electric control adjusting valve is a normally closed valve, and the auxiliary electric control adjusting valve is connected with the controller.
5. The dilution air heating structure for an SCR denitration pyrolysis furnace as defined in claim 1, wherein the heat receiving pipe of the heat exchanger in the furnace is a high temperature resistant seamless steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322032113.7U CN220657068U (en) | 2023-07-31 | 2023-07-31 | Dilution air heating structure for SCR denitration pyrolysis furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322032113.7U CN220657068U (en) | 2023-07-31 | 2023-07-31 | Dilution air heating structure for SCR denitration pyrolysis furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220657068U true CN220657068U (en) | 2024-03-26 |
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ID=90333133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322032113.7U Active CN220657068U (en) | 2023-07-31 | 2023-07-31 | Dilution air heating structure for SCR denitration pyrolysis furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220657068U (en) |
-
2023
- 2023-07-31 CN CN202322032113.7U patent/CN220657068U/en active Active
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