CN217909728U - Coke oven flue gas SCR denitrification facility - Google Patents
Coke oven flue gas SCR denitrification facility Download PDFInfo
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- CN217909728U CN217909728U CN202221859088.9U CN202221859088U CN217909728U CN 217909728 U CN217909728 U CN 217909728U CN 202221859088 U CN202221859088 U CN 202221859088U CN 217909728 U CN217909728 U CN 217909728U
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Abstract
The utility model discloses a coke oven flue gas SCR denitrification facility, including the coke oven that communicates in proper order, flue gas pipeline and SCR denitration reactor, the flow direction of following the flue gas on the flue gas pipeline has set gradually filter and gas mixer, the filter includes nipple joint and the flange of setting at the nipple joint both ends, flange and the companion flange cooperation of setting on flue gas pipeline are connected, the inside filter screen that is provided with of nipple joint near the exit end, nipple joint bottom at filter screen inlet end is provided with the ash bucket, be provided with the flue gas branch pipe on the flue gas pipeline between filter and the gas mixer, be provided with the air exhauster on the flue gas branch pipe, be provided with the gas-supply pipe on the gas mixer, the indoor top of coke oven carbomorphism is provided with the heat exchange tube, the inlet end of heat exchange tube and the tip intercommunication of flue gas branch pipe, the end and the gas-supply pipe intercommunication of giving vent to anger of heat exchange tube. The utility model discloses have the filter action, the denitration is effectual, and the running cost is low, has apparent economic value and social value.
Description
Technical Field
The utility model relates to a coke oven flue gas purification technical field, concretely relates to coke oven flue gas SCR denitrification facility.
Background
The coking industry has received common attention from social and environmental protection departments as a cross-domain of the steel industry and the coal chemical industry. The existing coke oven production smoke has large environmental pollution, the problem of atmospheric pollution becomes a key field of environmental protection under the condition that severe haze weather frequently occurs in the north China area in recent years, and governments continuously strengthen the establishment, execution and inspection of environmental protection laws and regulations. The coke oven adopts coal as raw material, under the condition of high temperature and air isolation, the coal is carbonized and carbonized, coke is produced, and simultaneously coal gas is produced. In the coking process, a large amount of nitrogen oxides are contained in the gas generated in a coking chamber of a coke oven, ammonia water is usually adopted for spraying, and the nitrogen oxides react with the ammonia water to produce nitrogen and water under the action of high temperature and a catalyst, so that the content of the nitrogen oxides in the gas is reduced.
Denitration refers to a process of removing nitrogen oxides in combustion flue gas, and the existing SCR is the most mature denitration technology, and the principle is that under the action of a catalyst, a reducing agent (liquid ammonia) reacts with the nitrogen oxides in the flue gas to generate harmless nitrogen and water, so that NOx in the flue gas is removed. Denitration is generally carried out by adopting three parts of before, during and after combustion, and the denitration method during the combustion of the coke oven comprises the following steps: low-temperature combustion, low-oxygen combustion, coal powder concentration and dilution separation and flue gas recirculation technology. In the prior art, single equipment is connected with each other to support multiple technologies, and the multiple equipment simultaneously work, so that the energy consumption is high and the cost is high; the existing equipment can not effectively filter harmful components such as tar and the like in the flue gas during the combustion of the coke oven in use, and is inconvenient to use; in addition, the temperature of the coke oven flue gas exhausted by the coke oven is generally below 280 ℃ or even lower, and because the temperature of the coke oven flue gas is lower, the denitration reaction can only be carried out in a low-temperature denitration environment, the SCR denitration efficiency of the coke oven flue gas is low, the denitration effect is poor, and the denitration equipment is difficult to stably operate for a long time. Therefore, it is objectively needed to develop a coke oven flue gas SCR denitration device with filtering function, good denitration effect and low operation cost.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coke oven flue gas SCR denitrification facility that has the filtering action, and the denitration is effectual, and the running cost is low.
The utility model aims at realizing like this, including the coke oven that communicates in proper order, flue gas pipeline and SCR denitration reactor, the flow direction along the flue gas has set gradually filter and gas mixer on the flue gas pipeline, the filter includes nipple joint and the flange of setting at the nipple joint both ends, flange is connected with the companion flange cooperation of setting on flue gas pipeline, the inside filter screen that is provided with of nipple joint near the exit end, nipple joint bottom at filter screen inlet end, be provided with the flue gas branch pipe on the flue gas pipeline between filter and the gas mixer, be provided with the air exhauster on the flue gas branch pipe, be provided with the gas-supply pipe on the gas mixer, the indoor top of coke oven carbomorphism is provided with the heat exchange tube, the inlet end of heat exchange tube and the tip intercommunication of flue gas branch pipe, the end and the gas-supply pipe intercommunication of giving vent to anger of heat exchange tube.
Furthermore, a flow regulating valve is arranged on the flue gas branch pipe.
Further, a heating element is arranged in the gas mixer.
Further, a stirrer is arranged in the gas mixer.
Furthermore, the number of the filters is two, and the filters are sequentially connected in series on the flue gas pipeline.
Furthermore, the mesh diameter of the filter net of the latter filter is smaller than that of the filter net of the former filter.
Furthermore, a bypass pipe is connected in parallel on the flue gas pipeline at the two ends of each filter, a bypass valve is arranged on each bypass pipe, and a gate valve is arranged on the flue gas pipeline at the air inlet end of each filter.
The utility model is used for denitration treatment of coke oven flue gas, during treatment, the coke oven flue gas is discharged from the coke oven and is sent into the SCR denitration reactor through the flue gas pipeline, the coke oven flue gas passes through the filter firstly in the process of being conveyed in the flue gas pipeline, the filter screen in the filter filters particle impurities, ammonium salts and sticky particles in the coke oven flue gas, various separated impurities fall into the ash bucket for storage, and the ash bucket is cleaned up regularly, and the filter and the flue gas pipeline are connected through the flange, the loading and unloading are convenient, the operation is convenient, the whole filter can be taken down quickly for treatment when the filter screen is blocked, the filtered coke oven flue gas continues to flow, when the flue gas branch pipe is met, part of the coke oven flue gas is sent into the heat exchange pipe in the coke oven along the flue gas branch pipe under the action of the exhaust fan, after the heat at the top of the coke oven is absorbed, the temperature of the coke oven smoke is greatly increased, and then the coke oven smoke is introduced into the gas mixer from the gas conveying pipe, so that two strands of coke oven smoke are mixed into the gas mixer, one of the coke oven smoke is directly introduced into the gas mixing pipe from the smoke pipeline, the temperature of the coke oven smoke is lower, the other part of the coke oven smoke is heated coke oven smoke, the temperature of the coke oven smoke is higher, the two strands of coke oven smoke are fully mixed in the gas mixer, after the temperature is averaged, the coke oven smoke with higher temperature is obtained, and after the coke oven smoke is introduced into the SCR denitration reactor, the denitration efficiency can be improved, the capital investment of the denitration catalyst is reduced, the service life and the activity of the denitration catalyst are improved, the denitration running cost is reduced, the heat in the coke oven is utilized by heating and temperature rise, no new energy consumption is increased, and the denitration cost is further reduced. The utility model discloses have the filter action, the denitration is effectual, and the running cost is low, has apparent economic value and social value.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-coke oven, 2-flue gas pipeline, 3-SCR denitration reactor, 4-gas mixer, 5-short section, 6-connecting flange, 7-mating flange, 8-filter screen, 9-ash bucket, 10-flue gas branch pipe, 11-exhaust fan, 12-gas pipe, 13-heat exchange pipe, 14-flow regulating valve, 15-heating element, 16-stirrer, 17-gate valve, 18-bypass pipe and 19-bypass valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited in any way, and any changes or improvements based on the present invention are all within the protection scope of the present invention.
As shown in fig. 1, the utility model discloses a coke oven 1 that communicates in proper order, flue gas pipeline 2 and SCR denitration reactor 3, coke oven 1, flue gas pipeline 2 and SCR denitration reactor 3 are prior art, coke oven 1 is used for producing the coke, produce a large amount of coke oven flue gas simultaneously, flue gas pipeline 2 sends the coke oven flue gas to and carries out denitration treatment in SCR denitration reactor 3, be provided with denitration catalyst in the SCR denitration reactor 3, be used for promoting going on of denitration reaction, flue gas pipeline 2 is gone up and has set gradually filter and gas mixer 4 along the flow direction of flue gas, gas mixer 4 is prior art, be used for carrying out intensive mixing to two kinds of gases, the filter includes nipple joint 5 and sets up flange 6 at nipple joint 5 both ends, flange 6 is connected with the companion flange 7 cooperation that sets up on flue gas pipeline 2, nipple joint 5 inside being close to the exit end is provided with carbomorphism filter screen 8, nipple 5 bottom at filter screen 8 inlet end is provided with ash bucket 9, be provided with flue gas branch pipe 10 on flue gas pipeline 2 between filter and the gas mixer 4, be provided with flue gas branch pipe 10 on flue gas branch 10, be provided with the heat exchange tube end of heat exchange tube 13 indoor heat exchange tube intercommunication of heat exchange tube 13 material of coke oven, flue gas exchange tube 13.
The utility model is used for denitration treatment of coke oven flue gas, during treatment, the coke oven flue gas is discharged from a coke oven 1 and is sent into an SCR denitration reactor 3 through a flue gas pipeline 2, the coke oven flue gas passes through a filter firstly in the process of being conveyed in the flue gas pipeline 2, a filter screen 8 in the filter filters particle impurities, ammonium salts and sticky particles in the coke oven flue gas, various separated impurities fall into an ash bucket 9 for storage and are cleaned regularly, the filter is connected with the flue gas pipeline 2 through a flange, the loading and unloading are convenient, the operation is convenient, the whole filter can be taken down quickly for treatment when the filter screen 8 is blocked, the filtered coke oven flue gas continues to flow, when encountering a flue gas branch pipe 10, part of the coke oven flue gas is sent into a heat exchange pipe 13 in the flue gas branch pipe 1 along the flue gas branch pipe 10 under the action of an exhaust fan 11, after absorbing the heat at the top of the coke oven 1, the temperature of the coke oven smoke is greatly raised, and then the coke oven smoke is introduced into the gas mixer 4 from the gas conveying pipe 12, so that two coke oven smoke are mixed into the gas mixer 4, one coke oven smoke is directly introduced into the gas conveying pipe 2, the temperature of the coke oven smoke is lower, the other coke oven smoke is heated, the temperature of the coke oven smoke is higher, the two coke oven smoke are fully mixed in the gas mixer 4, the coke oven smoke with higher temperature is obtained after the average temperature, and after the coke oven smoke is introduced into the SCR denitration reactor 3, the denitration efficiency can be improved, the capital investment of the denitration catalyst is reduced, the service life and the activity of the denitration catalyst are improved, further, the denitration operation cost is reduced, the heat in the coke oven 1 is utilized for heating the coke oven smoke, no new energy consumption is increased, and no new operation cost is increased, further reducing the denitration cost.
Be provided with flow control valve 14 on flue gas branch pipe 10, partial coke oven flue gas flows into coke oven 1 carbonization chamber through flue gas branch pipe 10 and heats, mixes with another part coke oven flue gas after the heating, and then obtains the higher coke oven flue gas of temperature, promotes denitration efficiency, and through the regulation of flow control valve 14, the steerable coke oven flue gas volume of heating of going on through flue gas branch pipe 10 ensures that two strands of coke oven flue gas mixing temperature can in the within range that needs.
Be provided with heating element 15 in the gas blender 4, heating element 15 is current structure for heat the coke oven flue gas in the gas blender 4, play the effect of auxiliary heating, when coke oven 1 broke down or when shutting down temporarily, the temperature of coke oven flue gas can not be promoted, and accessible heating element 15 heats, keeps the high-efficient denitration of coke oven flue gas.
Be provided with agitator 16 in the gas blender 4, agitator 16 is prior art, and during the operation, can stir two strands of coke oven flue gas in the gas blender, promotes two strands of coke oven flue gas and mixes for the mixing velocity of two strands of coke oven flue gas improves mixing efficiency, makes two strands of coke oven flue gas rapid mixing even, and then the gas temperature in the average gas blender 4.
Preferably, the number of the filters is two, the two filters are sequentially connected in series on the flue gas pipeline 2, and the two filters sequentially filter the coke oven flue gas.
In order to obtain better filtering effect, the diameter of the meshes of the filter screen 8 of the latter filter is smaller than that of the meshes of the filter screen 8 of the former filter, the two filter screens 8 filter the coke oven flue gas step by step, firstly remove the impurities with larger particles, and then remove the impurities with smaller particles, so that the filtering efficiency is improved.
The flue gas pipeline 2 at both ends of each filter is connected with a bypass pipe 18 in parallel, each bypass pipe 18 is provided with a bypass valve 19, the flue gas pipeline 2 at the air inlet end of each filter is provided with a gate valve 17, under normal conditions, the two gate valves 17 are normally open, the two bypass valves 19 are normally closed, the coke oven flue gas sequentially passes through the two filters to be subjected to impurity filtration, when a filter screen 8 in one of the filters is blocked, the gate valve 17 at the front side of the filter is closed, the bypass valve 19 on the bypass pipe 18 connected with the filter in parallel is opened, so the coke oven flue gas can pass through the bypass pipe 18, the blocked filter can be detached to be cleaned, the whole process can be carried out on line, the shutdown treatment is not needed, the operation stability of the system can be improved, and the efficiency is improved. In the practical implementation process, the flue gas pipeline 2 at the rear side of each filter can be provided with a one-way valve, so that when the filter is disassembled, the coke oven flue gas can be prevented from flowing backwards, and the coke oven flue gas can be prevented from leaking from the position of the filter.
Claims (7)
1. The coke oven flue gas SCR denitration device comprises a coke oven (1), a flue gas pipeline (2) and an SCR denitration reactor (3) which are sequentially communicated, and is characterized in that a filter and a gas mixer (4) are sequentially arranged on the flue gas pipeline (2) along the flow direction of flue gas, the filter comprises a short section (5) and connecting flanges (6) arranged at two ends of the short section (5), the connecting flanges (6) are matched and connected with mating flanges (7) arranged on the flue gas pipeline (2), a filter screen (8) is arranged inside the short section (5) close to the outlet end, an ash bucket (9) is arranged at the bottom of the short section (5) at the gas inlet end of the filter screen (8), a flue gas branch pipe (10) is arranged on the flue gas pipeline (2) between the filter and the gas mixer (4), an exhaust fan (11) is arranged on the flue gas branch pipe (10), a gas conveying pipe (12) is arranged on the gas mixer (4), a heat exchange pipe (13) is arranged at the indoor top of the coke oven (1), the gas inlet end of the heat exchange pipe (13) is communicated with the end of the flue gas branch pipe (10), and the coke oven (12).
2. The coke oven flue gas SCR denitration device of claim 1, wherein a flow regulating valve (14) is arranged on the flue gas branch pipe (10).
3. The coke oven flue gas SCR denitration device of claim 1, wherein a heating element (15) is arranged in the gas mixer (4).
4. The coke oven flue gas SCR denitration device according to claim 1, wherein a stirrer (16) is arranged in the gas mixer (4).
5. The coke oven flue gas SCR denitration device of claim 1, wherein the number of the filters is two, and the two filters are sequentially connected in series on the flue gas pipeline (2).
6. The coke oven flue gas SCR denitration device of claim 5, wherein the mesh diameter of the filter screen (8) of the latter filter is smaller than that of the filter screen (8) of the former filter.
7. The coke oven flue gas SCR denitration device of claim 5, wherein a bypass pipe (18) is connected in parallel to the flue gas pipeline (2) at both ends of each filter, a bypass valve (19) is arranged on each bypass pipe (18), and a gate valve (17) is arranged on the flue gas pipeline (2) at the air inlet end of each filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221859088.9U CN217909728U (en) | 2022-07-19 | 2022-07-19 | Coke oven flue gas SCR denitrification facility |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221859088.9U CN217909728U (en) | 2022-07-19 | 2022-07-19 | Coke oven flue gas SCR denitrification facility |
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| CN217909728U true CN217909728U (en) | 2022-11-29 |
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| CN202221859088.9U Active CN217909728U (en) | 2022-07-19 | 2022-07-19 | Coke oven flue gas SCR denitrification facility |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117101300A (en) * | 2023-08-25 | 2023-11-24 | 深圳市睿维盛环保科技有限公司 | VOCs exhaust treatment system |
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2022
- 2022-07-19 CN CN202221859088.9U patent/CN217909728U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117101300A (en) * | 2023-08-25 | 2023-11-24 | 深圳市睿维盛环保科技有限公司 | VOCs exhaust treatment system |
| CN117101300B (en) * | 2023-08-25 | 2024-05-24 | 深圳市睿维盛环保科技有限公司 | VOCs exhaust treatment system |
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