CN216062731U - Combined denitration device - Google Patents
Combined denitration device Download PDFInfo
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- CN216062731U CN216062731U CN202122581541.6U CN202122581541U CN216062731U CN 216062731 U CN216062731 U CN 216062731U CN 202122581541 U CN202122581541 U CN 202122581541U CN 216062731 U CN216062731 U CN 216062731U
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Abstract
The utility model provides a combined denitration device, which comprises: a carbonization furnace; the incinerator is connected with the outlet of the carbonization furnace; an SNCR flue with an inlet communicated with an outlet of the incinerator; the inlet of the waste heat boiler is communicated with the outlet of the SNCR flue; the inlet of the waste heat boiler bypass flue component is communicated with the outlet of the SNCR flue; the inlet of the SCR denitration reactor is communicated with the outlets of the waste heat boiler and the waste heat boiler bypass flue assembly; the induced draft fan is communicated with an outlet of the SCR denitration reactor; and the ammonia water injection system is used for injecting ammonia water into the SNCR flue. The combined denitration device can improve the denitration effect of the denitration device.
Description
Technical Field
The utility model relates to the technical field of carbonization furnace tail gas treatment, in particular to a combined denitration device.
Background
In recent years, with the national concern on environmental protection, the environmental protection requirements of the activated carbon industry are becoming more and more strict, and the environmental protection problem of the tail gas of the carbonization furnace in the activated carbon industry is attracting attention.
The carbonization furnace has complex physical and chemical reactions, the generated tail gas has complex components and contains dust and combustible gas, after the tail gas is burnt by the incinerator, the flue gas contains a large amount of NOx, and the flue gas can be discharged after being treated.
At present, a considerable part of active coke plants are only provided with a waste heat boiler after an incinerator, and waste heat of flue gas is recovered and then directly discharged into the atmosphere, so that the atmosphere is polluted. A selective non-catalytic reduction (SNCR) denitration technology is adopted in part of active coke plants, ammonia is directly sprayed into an incinerator or a high-temperature flue, a certain denitration effect is achieved, denitration efficiency is low, excessive ammonia needs to be sprayed in SNCR reaction, ammonia escape is high, the utilization rate of ammonia is low, secondary pollution is brought, and the operation cost is increased. Part of active coke plants adopt a low-temperature Selective Catalytic Reduction (SCR) denitration technology to treat NOx in flue gas, and the effect is not ideal, mainly because the low-temperature denitration technology is still not mature at present, the requirements on denitration conditions are strict, and the flue gas temperature is required to be stable.
Therefore, there is a need for improvement of the existing denitration apparatus to improve the denitration effect of the denitration apparatus.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a combined denitration device, which solves the problem that the existing denitration device is poor in denitration effect.
In order to solve the above technical problems, the present invention provides a combined denitration device, including: a carbonization furnace; the incinerator is connected with the outlet of the carbonization furnace; an SNCR flue with an inlet communicated with an outlet of the incinerator; the inlet of the waste heat boiler is communicated with the outlet of the SNCR flue; the inlet of the waste heat boiler bypass flue component is communicated with the outlet of the SNCR flue; the inlet of the SCR denitration reactor is communicated with the outlets of the waste heat boiler and the waste heat boiler bypass flue assembly; the induced draft fan is communicated with an outlet of the SCR denitration reactor; and the ammonia water injection system is used for injecting ammonia water into the SNCR flue.
Optionally, the exhaust-heat boiler bypass flue assembly includes a bypass flue and a bypass flue valve, an inlet of the bypass flue is communicated with an outlet of the SNCR flue, an outlet of the bypass flue is communicated with an inlet of the SCR denitration reactor, and the bypass flue valve is disposed on the bypass flue and is used for adjusting the flow rate of flue gas flowing through the bypass flue.
Optionally, the bypass flue valve is an electric valve.
Optionally, the system further comprises a cold air charging assembly, wherein the cold air charging assembly is communicated with the inlet of the SCR denitration reactor and is used for introducing cold air to the inlet of the SCR denitration reactor.
Optionally, the cold air charging assembly comprises a cold air pipeline and a cold air valve arranged on the cold air pipeline, one end of the cold air pipeline is communicated with the atmosphere, and the other end of the cold air pipeline is communicated with an inlet of the SCR denitration reactor.
Optionally, the cold air valve is an electric valve.
Optionally, the system further comprises an economizer, one end of the economizer is communicated with an outlet of the SCR denitration reactor, and the other end of the economizer is communicated with the induced draft fan.
Optionally, aqueous ammonia injection system is including the aqueous ammonia jar that is used for storing the aqueous ammonia for spray gun of spraying the aqueous ammonia, one end and aqueous ammonia jar intercommunication other end with the aqueous ammonia pipeline of spray gun intercommunication sets up last being used for of aqueous ammonia pipeline pumps the delivery pump to the spray gun with the aqueous ammonia to and compressed air source, wherein, the spray gun still with compressed air source intercommunication.
Optionally, the ammonia water injection system further comprises a flow meter arranged on the ammonia water conveying pipeline and used for metering the flow of the ammonia water.
The combined denitration device provided by the utility model has the following beneficial effects:
the ammonia water injection system is used for injecting ammonia water into the SNCR flue, so that denitration treatment can be performed on flue gas in the SNCR flue; because the inlet of the SNCR flue is communicated with the outlet of the incinerator, the inlet of the waste heat boiler is communicated with the outlet of the SNCR flue, the inlet of the waste heat boiler bypass flue component is communicated with the outlet of the SNCR flue, and the inlet of the SCR denitration reactor is communicated with the outlets of the waste heat boiler and the waste heat boiler bypass flue component, namely, the SNCR flue is arranged at the upstream of the SCR denitration reactor, therefore, the flue gas from the carbonization furnace firstly passes through the SNCR flue after being combusted by the incinerator and then passes through the SCR denitration reactor, so that the flue gas can be subjected to denitration treatment in the SNCR flue and then subjected to denitration treatment in the SCR denitration reactor, thereby combining the SNCR denitration technology and the SCR, improving the denitration effect of the denitration device, reducing ammonia escape and improving the utilization rate of ammonia; because the entry of SNCR flue and the export intercommunication of burning furnace, exhaust-heat boiler's entry and the export intercommunication of SNCR flue, the entry of exhaust-heat boiler bypass flue subassembly and the export intercommunication of SNCR flue, the entry of SCR denitration reactor and the export intercommunication of exhaust-heat boiler and exhaust-heat boiler bypass flue subassembly, be provided with exhaust-heat boiler and exhaust-heat boiler bypass flue subassembly promptly between SNCR flue and SCR denitration reactor, so can lead to exhaust-heat boiler and exhaust-heat boiler bypass flue subassembly and adjust the processing to the temperature of flue gas, thereby make the flue gas temperature that flows into SCR denitration reactor just in time be fit for the reaction temperature of SCR denitration reactor, and then adopt conventional high temperature catalyst can realize the efficient denitration, and is with low costs, and make the catalyst operation more stable.
Drawings
FIG. 1 is a schematic structural diagram of an integrated denitration device in the embodiment of the utility model.
Description of reference numerals:
110-a carbonization furnace;
120-an incinerator;
130-SNCR flue;
140-a waste heat boiler;
150-a waste heat boiler bypass flue assembly; 151-bypass flue; 152-a bypass flue valve;
160-SCR denitration reactor;
170-induced draft fan;
180-ammonia injection system; 181-ammonia tank; 182-a spray gun; 183-ammonia water delivery line; 184-a delivery pump; 185-a source of compressed air; 186-a flow meter;
190-cold air charging component; 191-a cold air duct; 192-a cold air valve;
210-economizer.
Detailed Description
The combined denitration device provided by the utility model is further described in detail by combining the attached drawings and specific examples. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an integrated denitration device in an embodiment of the present invention, and the embodiment provides an integrated denitration device including: a carbonization furnace 110; an incinerator 120 connected to an outlet of the carbonization furnace 110; an SNCR flue 130 having an inlet communicating with an outlet of the incinerator 120; a waste heat boiler 140 with an inlet communicated with an outlet of the SNCR flue 130; a waste heat boiler bypass flue assembly 150 having an inlet in communication with an outlet of the SNCR flue 130; an SCR denitration reactor 160 having an inlet communicated with outlets of the exhaust heat boiler 140 and the exhaust heat boiler bypass flue assembly 150; an induced draft fan 170 communicated with an outlet of the SCR denitration reactor 160; and an ammonia water injection system 180 for injecting ammonia water into the SNCR flue 130.
The ammonia water injection system 180 is used for injecting ammonia water into the SNCR flue 130, so that denitration treatment can be performed on flue gas in the SNCR flue 130; because the inlet of the SNCR flue 130 is communicated with the outlet of the incinerator 120, the inlet of the exhaust-heat boiler 140 is communicated with the outlet of the SNCR flue 130, the inlet of the exhaust-heat boiler bypass flue assembly 150 is communicated with the outlet of the SNCR flue 130, and the inlet of the SCR denitration reactor 160 is communicated with the outlets of the exhaust-heat boiler 140 and the exhaust-heat boiler bypass flue assembly 150, that is, the SNCR flue 130 is disposed at the upstream of the SCR denitration reactor 160, the flue gas from the carbonization furnace 110 is combusted by the incinerator 120, passes through the SNCR flue 130, and then passes through the SCR denitration reactor 160, so that the flue gas can be denitrated by the SCR denitration reactor 160 again after being denitrated in the SNCR flue 130, thereby combining the SNCR denitration technology with the SCR, improving the denitration effect of the denitration device, reducing ammonia escape, and improving the utilization rate of ammonia; because the inlet of the SNCR flue 130 is communicated with the outlet of the incinerator 120, the inlet of the exhaust-heat boiler 140 is communicated with the outlet of the SNCR flue 130, the inlet of the exhaust-heat boiler bypass flue assembly 150 is communicated with the outlet of the SNCR flue 130, and the inlet of the SCR denitration reactor 160 is communicated with the outlets of the exhaust-heat boiler 140 and the exhaust-heat boiler bypass flue assembly 150, that is, the exhaust-heat boiler 140 and the exhaust-heat boiler bypass flue assembly 150 are arranged between the SNCR flue 130 and the SCR denitration reactor 160, so that the temperature of the flue gas can be adjusted by the exhaust-heat boiler 140 and the exhaust-heat boiler bypass flue assembly 150, and the temperature of the flue gas flowing into the SCR denitration reactor 160 is just suitable for the reaction temperature of the SCR denitration reactor 160, and further, efficient denitration can be realized by adopting a conventional high-temperature catalyst, the cost is low, and the operation of the catalyst is more stable.
The waste heat boiler bypass flue assembly 150 comprises a bypass flue 151 and a bypass flue valve 152, wherein an inlet of the bypass flue 151 is communicated with an outlet of the SNCR flue 130, an outlet of the bypass flue 151 is communicated with an inlet of the SCR denitration reactor 160, and the bypass flue valve 152 is arranged on the bypass flue 151 and used for adjusting the flow of flue gas flowing through the bypass flue 151.
The bypass flue valve 152 may be an electrically operated valve.
The waste heat boiler 140 and the waste heat boiler bypass flue assembly 150 are used for regulating the temperature of the flue gas. For example, when the temperature of the flue gas in the SCR denitration reactor 160 is higher than the denitration temperature requirement of the SCR denitration reactor 160, the bypass flue valve 152 may be closed, so that the flue gas flowing out of the SNCR flue 130 flows into the SCR denitration reactor 160 from the waste heat boiler 140, that is, the waste heat boiler 140 absorbs the heat in the flue gas, so as to reduce the temperature of the flue gas, and meet the denitration temperature requirement of the SCR denitration reactor 160; when the temperature of the flue gas in the SCR denitration reactor 160 is lower than the denitration temperature requirement of the SCR denitration reactor 160, the bypass flue valve 152 may be opened, so that the flue gas flowing out of the SNCR flue 130 flows into the SCR denitration reactor 160 from the bypass flue 151, that is, the heat in the flue gas does not need to be absorbed by the exhaust-heat boiler 140, so that the temperature of the flue gas is kept at a higher temperature, and the denitration temperature requirement of the SCR denitration reactor 160 is met.
Further, the combined denitration device further comprises a cold air charging assembly 190, wherein the cold air charging assembly 190 is communicated with the inlet of the SCR denitration reactor 160 and is used for introducing cold air to the inlet of the SCR denitration reactor 160 so as to reduce the temperature of the flue gas in the SCR denitration reactor 160.
The cold air charging assembly 190 comprises a cold air pipeline 191 and a cold air valve 192 arranged on the cold air pipeline 191, one end of the cold air pipeline 191 is communicated with the atmosphere, and the other end of the cold air pipeline 191 is communicated with an inlet of the SCR denitration reactor 160.
The cool air valve 192 may be an electric valve.
In this embodiment, the exhaust-heat boiler 140, the exhaust-heat boiler bypass flue assembly 150, and the cold air charging assembly 190 are combined together to adjust the temperature of the flue gas in the SCR denitration reactor 160. For example, when the temperature of the flue gas in the SCR denitration reactor 160 is higher than the denitration temperature requirement of the SCR denitration reactor 160, the bypass flue valve 152 may be closed, so that the flue gas flowing out of the SNCR flue 130 flows into the SCR denitration reactor 160 from the exhaust-heat boiler 140, that is, the exhaust-heat boiler 140 absorbs the heat in the flue gas to reduce the temperature of the flue gas, and if the temperature of the flue gas is still higher than the denitration temperature requirement of the SCR denitration reactor 160, the cold air valve 192 may be opened to introduce cold air into the inlet of the SCR denitration reactor 160 through the cold air charging assembly 190, so that the temperature of the flue gas meets the denitration temperature requirement of the SCR denitration reactor 160; when the temperature of the flue gas in the SCR denitration reactor 160 is lower than the denitration temperature requirement of the SCR denitration reactor 160, the bypass flue valve 152 may be opened, and the cold air valve 192 may be closed, so that the flue gas flowing out of the SNCR flue 130 flows into the SCR denitration reactor 160 from the bypass flue 151, that is, the heat in the flue gas does not need to be absorbed by the exhaust-heat boiler 140, so that the temperature of the flue gas is kept at a higher temperature, and the denitration temperature requirement of the SCR denitration reactor 160 is met.
Further, the combined denitration device further comprises an economizer 210, wherein the economizer 210 is arranged between the induced draft fan 170 and the outlet of the SCR denitration reactor 160, one end of the economizer 210 is communicated with the outlet of the SCR denitration reactor 160, and the other end of the economizer 210 is communicated with the induced draft fan 170. The economizer 210 can recover heat of flue gas flowing out of the SCR denitration reactor 160, thereby avoiding waste of heat in the flue gas.
The ammonia water injection system 180 comprises an ammonia water tank 181 for storing ammonia water, a spray gun 182 for injecting ammonia water, an ammonia water conveying pipeline 183, a conveying pump 184 and a compressed air source 185, wherein one end of the ammonia water conveying pipeline 183 is communicated with the ammonia water tank 181, the other end of the ammonia water conveying pipeline 183 is communicated with the spray gun 182, the conveying pump 184 is arranged on the ammonia water conveying pipeline 183 and is used for pumping the ammonia water to the spray gun 182, and the spray gun 182 is further communicated with the compressed air source 185.
The ammonia injection system 180 further includes a flow meter 186 disposed on the ammonia delivery pipe 183 for measuring the flow rate of the ammonia.
Ammonia water from an ammonia water tank 181 is delivered to a spray gun 182 through a delivery pump 184, the ammonia water is metered by a flow meter 186 and then directly contacts with compressed air from a compressed air source 185 in the spray gun 182, and under the action of the compressed air, the ammonia water is atomized into superfine droplets and sprayed into the SNCR flue 130.
The ammonia water is directly atomized through the spray gun 182 and then enters the SNCR flue 130 to be vaporized, the ammonia gas and the flue gas are fully mixed in the SNCR flue 130, and the whole denitration system does not need an ammonia gas dilution system and a mixing system, so that the denitration process system is simplified, the cost is reduced, and the operation and maintenance workload is reduced.
The working process of the combined denitration device is as follows: firstly, the carbonized tail gas from the carbonization furnace 110 enters the incinerator 120 to be incinerated, the temperature of the incinerated flue gas can reach 850-1100 ℃, the high-temperature flue gas at the outlet of the incinerator 120 is mixed with the atomized ammonia water sprayed by the spray gun 182, the ammonia water is vaporized by the high-temperature flue gas, the ammonia gas and the NOx are subjected to SNCR denitration reaction, then the flue gas mixture enters the waste heat boiler 140, the flue gas and the ammonia gas are further mixed when passing through the tube bank of the waste heat boiler 140, meanwhile, the heat of the flue gas is recovered by the waste heat boiler 140, the temperature of the mixture of the cooled flue gas and the ammonia gas is 300-420 ℃, the mixture enters the SCR denitration reactor 160, under the action of the catalyst, the residual NOx in the flue gas and ammonia gas undergo an oxidation-reduction reaction to further remove the NOx in the flue gas, the denitrated flue gas enters the economizer 210 to further recover the waste heat of the flue gas, and the cooled flue gas is sent to the subsequent treatment process through the induced draft fan 170.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A combined denitration device, comprising:
a carbonization furnace;
the incinerator is connected with the outlet of the carbonization furnace;
an SNCR flue with an inlet communicated with an outlet of the incinerator;
the inlet of the waste heat boiler is communicated with the outlet of the SNCR flue;
the inlet of the waste heat boiler bypass flue component is communicated with the outlet of the SNCR flue;
the inlet of the SCR denitration reactor is communicated with the outlets of the waste heat boiler and the waste heat boiler bypass flue assembly;
the induced draft fan is communicated with an outlet of the SCR denitration reactor; and the number of the first and second groups,
and the ammonia water injection system is used for injecting ammonia water into the SNCR flue.
2. The combined denitration device of claim 1, wherein the exhaust heat boiler bypass flue assembly comprises a bypass flue and a bypass flue valve, an inlet of the bypass flue is communicated with an outlet of the SNCR flue, an outlet of the bypass flue is communicated with an inlet of the SCR denitration reactor, and the bypass flue valve is arranged on the bypass flue and used for regulating the flow of flue gas flowing through the bypass flue.
3. The integrated denitrification facility of claim 2, wherein the bypass flue valve is an electrically operated valve.
4. The combined denitration device of claim 1, further comprising a cold brew air assembly in communication with the inlet of the SCR denitration reactor for introducing cold air to the SCR denitration reactor inlet.
5. The combined denitration device of claim 4, wherein the cold air charging assembly comprises a cold air duct and a cold air valve arranged on the cold air duct, one end of the cold air duct is communicated with the atmosphere, and the other end of the cold air duct is communicated with an inlet of the SCR denitration reactor.
6. The combined denitration device of claim 5, wherein the cool air valve is an electric valve.
7. The combined denitration device according to claim 1, further comprising an economizer, wherein one end of the economizer is communicated with an outlet of the SCR denitration reactor, and the other end of the economizer is communicated with the induced draft fan.
8. The combined denitration device of claim 1, wherein the ammonia injection system comprises an ammonia tank for storing ammonia, a spray gun for injecting ammonia, an ammonia delivery pipe with one end communicated with the ammonia tank and the other end communicated with the spray gun, a delivery pump arranged on the ammonia delivery pipe and used for pumping ammonia to the spray gun, and a compressed air source, wherein the spray gun is also communicated with the compressed air source.
9. The combined denitration apparatus of claim 8, wherein the ammonia injection system further comprises a flow meter disposed on the ammonia delivery pipe for metering the flow rate of the ammonia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122581541.6U CN216062731U (en) | 2021-10-26 | 2021-10-26 | Combined denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122581541.6U CN216062731U (en) | 2021-10-26 | 2021-10-26 | Combined denitration device |
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| Publication Number | Publication Date |
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| CN216062731U true CN216062731U (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122581541.6U Active CN216062731U (en) | 2021-10-26 | 2021-10-26 | Combined denitration device |
Country Status (1)
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|---|---|
| CN (1) | CN216062731U (en) |
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2021
- 2021-10-26 CN CN202122581541.6U patent/CN216062731U/en active Active
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