CN216458052U - Catalytic denitration exhaust-gas treatment system - Google Patents
Catalytic denitration exhaust-gas treatment system Download PDFInfo
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- CN216458052U CN216458052U CN202122940764.7U CN202122940764U CN216458052U CN 216458052 U CN216458052 U CN 216458052U CN 202122940764 U CN202122940764 U CN 202122940764U CN 216458052 U CN216458052 U CN 216458052U
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Abstract
The utility model relates to a catalytic denitration waste gas treatment system which comprises a heating device, a cooling device, an ammonia water supply device and a denitration reaction device, wherein the air inlet end of the heating device is connected with an air inlet pipe, a first temperature sensor is installed on the air inlet pipe, the air outlet end of the heating device is communicated with the cooling device, a second temperature sensor is installed on a pipeline between the heating device and the cooling device, the air outlet end of the cooling device is connected with the ammonia water supply device, and the air outlet end of the ammonia water supply device is communicated with a denitration reaction deviceAnd a third temperature sensor is arranged on a pipeline between the ammonia water supply device and the denitration reaction device, and the air outlet end of the denitration reaction device is communicated to the chimney through an air outlet pipe. The utility model detects the temperature of the waste gas through the temperature sensor, regulates the temperature of the waste gas to be the temperature required by the process through the heating device and the cooling device, and regulates the temperature of the waste gas to be the temperature required by the process through NH3Sensor and NOx sensor for detecting NH3And NOx surplus controls the ammonia water injection amount, and the waste gas treatment efficiency is high.
Description
Technical Field
The utility model relates to the technical field of waste gas treatment, in particular to a catalytic denitration waste gas treatment system.
Background
The catalytic reduction (SCR) is a method for denitration after furnace, which uses reducing agent (NH)3) Selectively reacts with NOx to generate N under the action of metal catalyst2And H2And O. NOx (mainly NO) is reduced to N which has little influence on the atmosphere under the action of a catalyst by utilizing the reduction function of ammonia on NOx2And water, the reducing agent being NH3。
The catalyst used in SCR is mostly TiO2As a carrier, with V2O5Or V2O5-WO3Or V2O5-MoO3Is used as active component and is made into honeycomb type, plate type or corrugated type. The SCR catalyst applied to flue gas denitration can be divided into a high-temperature catalyst (345-590 ℃), a medium-temperature catalyst (260-380 ℃) and a low-temperature catalyst (80-300 ℃), and the suitable reaction temperatures of different catalysts are different. If the reaction temperature is lower, the activity of the catalyst is reduced, resulting in a decrease in denitration efficiency, and if the catalyst is continuously operated at a low temperature, the catalyst is permanently damaged; if the reaction temperature is too high, NH3The catalyst is easy to be oxidized, the generation amount of NOx is increased, phase change of catalyst materials is caused, the activity of the catalyst is degraded, the exhaust gas treatment efficiency of the existing catalytic denitration exhaust gas treatment system is low due to the temperature patch of industrial production exhaust gas, and pollutants in the treated exhaust gas pollute the atmosphere.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a catalytic denitration exhaust gas treatment system, which is used for solving the problems of low catalytic denitration exhaust gas treatment efficiency and incomplete exhaust gas treatment in the prior art.
The utility model provides a catalytic denitration waste gas treatment system which comprises a heating device, a cooling device, an ammonia water supply device and a denitration reaction device, wherein the air inlet end of the heating device is connected with an air inlet pipe, a first temperature sensor is installed on the air inlet pipe, the air outlet end of the heating device is communicated with the cooling device, a second temperature sensor is installed on a pipeline between the heating device and the cooling device, the air outlet end of the cooling device is connected with the ammonia water supply device, the air outlet end of the ammonia water supply device is communicated with the denitration reaction device, a third temperature sensor is installed on a pipeline between the ammonia water supply device and the denitration reaction device, and the air outlet end of the denitration reaction device is communicated with an air outlet pipe chimney.
Further, still include the mixing box, the gas outlet at aqueous ammonia feeding device is installed to the mixing box, aqueous ammonia and waste gas at the mixing box intensive mixing.
And the two ends of the pressure difference sensor are communicated with the gas inlet end and the gas outlet end of the denitration reaction device.
Further, the gas outlet pipe is provided with NH3Sensors and NOx sensors.
Further, aqueous ammonia feeding device includes box and aqueous ammonia spray set, aqueous ammonia spray set's entry linkage aqueous ammonia supply pipe, installation aqueous ammonia valve on the aqueous ammonia supply pipe, NH3The sensor and the NOx sensor detect NH3And when the content of the NOx exceeds the standard, the opening of the ammonia water valve is adjusted through an external control system.
Furthermore, the cooling device comprises a cooling box and a water spraying device, the water spraying device is installed in the cooling box, an inlet of the water spraying device is connected with a water inlet pipe, a water inlet valve is installed on the water inlet pipe, and the opening degree of the water inlet valve is adjusted by the water inlet valve according to the temperature detected by the temperature sensor III.
The technical scheme of the utility model has the beneficial effects that:
the catalytic denitration waste gas treatment system detects the temperature of waste gas entering the system through the first temperature sensor, heats the waste gas through the heating device when the temperature of the waste gas is lower than the temperature required by the process, cools the waste gas through the cooling device when the temperature of the waste gas is higher than the temperature required by the process, detects the temperature of the waste gas at the air inlet of the denitration reaction device through the third temperature sensor, and detects the temperature of the waste gas at the air inlet of the denitration reaction device according to the temperatureThe opening degree of the water inlet valve is adjusted according to the temperature value detected by the degree sensor III; by NH3Sensor and NOx sensor for detecting NH at gas outlet of denitration reaction device3And the content of NOx, when the content exceeds the standard, the opening degree of the ammonia water valve is adjusted until the waste gas reaches the standard and is discharged; the state of the denitration reaction device is detected through the pressure difference sensor, and the denitration reaction device is shut down for maintenance when the pressure difference exceeds the standard, so that safety accidents are avoided.
Drawings
FIG. 1 is a schematic structural diagram of a catalytic denitration exhaust gas treatment system according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1-heating device, 2-cooling device, 3-ammonia water supply device, 4-denitration reaction device, 5-air inlet pipe, 6-temperature sensor I, 7-temperature sensor II, 8-temperature sensor III, 9-air outlet pipe, 10-chimney, 11-mixing box, 12-differential pressure sensor, 13-NH3The sensor, 14-NOx sensor, 15-ammonia water supply pipe, 16-ammonia water valve, 17-water inlet pipe and 18-water inlet valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, this embodiment of a catalytic denitration exhaust-gas treatment system, including heating device 1, cooling device 2, aqueous ammonia feeding device 3 and denitration reaction device 4, intake pipe 5 is connected to heating device 1's inlet end, and heating device 1 is used for heating microthermal waste gas, installation temperature sensor 6 on the intake pipe 5, temperature sensor 6 detects the temperature that waste gas got into the system, heating device 1's the end of giving vent to anger communicates cooling device 2, and installs temperature sensor two 7 on the pipeline between heating device 1 and cooling device 2, and temperature sensor two 7 detects the temperature of cooling device 2 import department, and when the temperature exceeded the required temperature of technology, start cooling device 2 through external control system and carry out waste gasCooling, the end of giving vent to anger of cooling device 2 is connected aqueous ammonia feeding device 3, and the aqueous ammonia gets into and mixes with waste gas, provides reductant NH for the denitration reaction3The outlet end of the ammonia water supply device 3 is communicated to the denitration reaction device 4, and the waste gas enters the denitration reaction device 4 for reduction reaction to reduce NOx into N2、H2And the clean components such as O and the like are discharged into a chimney, a temperature sensor III 8 is arranged on a pipeline between the ammonia water supply device 3 and the denitration reaction device 4, the cooling force of the cooling device 2 is adjusted according to the temperature detected by the temperature sensor III 8, and the gas outlet end of the denitration reaction device 4 is communicated to the chimney 10 through a gas outlet pipe 9.
Preferably, still include mixing box 11, mixing box 11 installs the gas outlet at aqueous ammonia feeding device 3, and aqueous ammonia and waste gas are at mixing box 11 intensive mixing, ensure that the waste gas that gets into denitration reaction unit 4 can evenly take place the reaction.
Preferably, the denitration reactor further comprises a pressure difference sensor 12, two ends of the pressure difference sensor 12 are communicated with the air inlet end and the air outlet end of the denitration reactor 4, the pressure difference sensor 12 detects the pressure difference between the two ends of the air inlet and the air outlet of the denitration reactor 4, and when the pressure difference exceeds the allowable range, the denitration reactor 4 is stopped to be maintained, so that safety accidents are avoided.
Preferably, the outlet pipe 9 is provided with NH3 A sensor 13 and a NOx sensor 14 for detecting NH in the exhaust gas at the outlet of the denitration reactor 43And NOx content, the ammonia water supply device 3 comprises a box body and an ammonia water spraying device, the inlet of the ammonia water spraying device is connected with an ammonia water supply pipe 15, an ammonia water valve 16 and NH are arranged on the ammonia water supply pipe 153The sensor 13 and the NOx sensor 14 detect NH3And the opening of the ammonia valve 16 is adjusted by an external control system when the content of NOx exceeds the standard.
Specifically, the cooling device 2 comprises a cooling box and a water spraying device, the water spraying device is installed in the cooling box, an inlet of the water spraying device is connected with a water inlet pipe 17, a water inlet valve 18 is installed on the water inlet pipe 17, and the opening degree of the water inlet valve 18 is adjusted by the water inlet valve 18 according to the temperature detected by the temperature sensor III 8.
The working method of the catalytic denitration waste gas treatment system comprises the following steps: waste gas enters the heating device 1 through the gas inlet pipe 5, when a first temperature sensor 6 on the gas inlet pipe 5 detects that the temperature of the waste gas is lower than the temperature required by the process, the heating device 1 is started to heat, and when the first temperature sensor 6 detects that the temperature of the waste gas meets or is higher than the temperature required by the process, the heating device 1 stops heating;
waste gas that heating device 1 flows out gets into aqueous ammonia feeding device 3 through cooling device 2, and the aqueous ammonia spouts into aqueous ammonia feeding device 3 and mixes with waste gas, and aqueous ammonia and waste gas get into denitration reaction device 4 after mixing box 11 intensive mixing and carry out the denitration reaction and reduce NOx in the waste gas to N2、H2And discharging clean components such as O and the like into the chimney 10.
In the process, the temperature sensor III 8 on the pipeline between the ammonia water supply device 3 and the denitration reactor 4 detects the temperature of the waste gas at the gas inlet of the denitration reactor 4, and adjusts the opening degree of the water inlet valve 18 through an external control system according to the temperature so as to adjust the temperature of the waste gas at the gas inlet of the denitration reactor 4 to the temperature required by the process.
Further, NH3 sensor 13 and NOx sensor 14 on the front end outlet pipe 9 of the stack 10 detect NH in the treated exhaust gas3Or the content of NOx exceeds the standard, the ammonia water valve 16 is adjusted through an external control system, and the amount of ammonia water entering the system is adjusted, so that the treated waste gas is ensured to reach the emission standard.
In conclusion, the catalytic denitration waste gas treatment system detects the temperature of waste gas entering the system through the first temperature sensor, heats the waste gas through the heating device when the temperature of the waste gas is lower than the temperature required by the process, cools the waste gas through the cooling device when the temperature of the waste gas is higher than the temperature required by the process, detects the temperature of the waste gas at the air inlet of the denitration reaction device through the third temperature sensor, and adjusts the opening degree of the water inlet valve according to the temperature value detected by the third temperature sensor; NH of an air outlet of a denitration reaction device is detected through an NH3 sensor and an NOx sensor3And the content of NOx, when the content exceeds the standard, the opening degree of the ammonia water valve is adjusted until the waste gas reaches the standard and is discharged; the state of the denitration reaction device is detected through the pressure difference sensor, and the denitration reaction device is shut down for maintenance when the pressure difference exceeds the standard, so that safety accidents are avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The catalytic denitration waste gas treatment system is characterized by comprising a heating device, a cooling device, an ammonia water supply device and a denitration reaction device, wherein the air inlet end of the heating device is connected with an air inlet pipe, a first temperature sensor is installed on the air inlet pipe, the air outlet end of the heating device is communicated with the cooling device, a second temperature sensor is installed on a pipeline between the heating device and the cooling device, the air outlet end of the cooling device is connected with the ammonia water supply device, the air outlet end of the ammonia water supply device is communicated to the denitration reaction device, a third temperature sensor is installed on a pipeline between the ammonia water supply device and the denitration reaction device, and the air outlet end of the denitration reaction device is communicated to an air outlet pipe chimney.
2. The catalytic denitration exhaust gas treatment system according to claim 1, further comprising a mixing tank installed at an outlet of the ammonia water supply device, wherein the ammonia water and the exhaust gas are sufficiently mixed in the mixing tank.
3. The catalytic denitration exhaust-gas treatment system of claim 1, further comprising a pressure difference sensor, wherein both ends of the pressure difference sensor are communicated with the gas inlet end and the gas outlet end of the denitration reaction device.
4. The catalytic denitration exhaust gas treatment system according to claim 1, wherein the outlet pipe is provided with NH3Sensors and NOx sensors.
5. The catalytic denitration exhaust gas treatment system of claim 4, wherein the ammonia water supply device comprises a box body and an ammonia water spraying device, an inlet of the ammonia water spraying device is connected with an ammonia water supply pipe, an ammonia water valve and an NH valve are mounted on the ammonia water supply pipe3The sensor and the NOx sensor detect NH3And when the content of the NOx exceeds the standard, the opening of the ammonia water valve is adjusted through an external control system.
6. The catalytic denitration exhaust-gas treatment system of claim 1, wherein the cooling device comprises a cooling tank and a water spraying device, the water spraying device is installed in the cooling tank, an inlet of the water spraying device is connected with a water inlet pipe, a water inlet valve is installed on the water inlet pipe, and the opening degree of the water inlet valve is adjusted by the water inlet valve according to the temperature detected by the temperature sensor III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122940764.7U CN216458052U (en) | 2021-11-26 | 2021-11-26 | Catalytic denitration exhaust-gas treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122940764.7U CN216458052U (en) | 2021-11-26 | 2021-11-26 | Catalytic denitration exhaust-gas treatment system |
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| CN216458052U true CN216458052U (en) | 2022-05-10 |
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| CN202122940764.7U Active CN216458052U (en) | 2021-11-26 | 2021-11-26 | Catalytic denitration exhaust-gas treatment system |
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2021
- 2021-11-26 CN CN202122940764.7U patent/CN216458052U/en active Active
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