CN213090500U - Be applicable to many pollutants of gas furnace kiln flue gas cooperative control system - Google Patents
Be applicable to many pollutants of gas furnace kiln flue gas cooperative control system Download PDFInfo
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- CN213090500U CN213090500U CN202022128917.3U CN202022128917U CN213090500U CN 213090500 U CN213090500 U CN 213090500U CN 202022128917 U CN202022128917 U CN 202022128917U CN 213090500 U CN213090500 U CN 213090500U
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Abstract
The utility model discloses a be applicable to gas furnace kiln flue gas multiple pollutants cooperative control system, gas furnace kiln export flue gas is through heat transfer systemThe system is heated and then enters a black smoke purification system, the purified black smoke is mixed with ammonia gas generated by spraying urea and enters a low-temperature denitration system for denitration, and the purified black smoke enters NH3The catalytic oxidation system treats ammonia escaping from the flue gas, and finally the ammonia enters a chimney through a draught fan to be discharged. The utility model provides a be applicable to gas furnace kiln flue gas multi-contaminant cooperative control system, black cigarette, NOx and NH in this system can cooperative control handles gas furnace kiln flue gas3And pollutants are treated, so that the standard emission of the flue gas of the gas furnace kiln is realized.
Description
The technical field is as follows:
the utility model relates to a be applicable to many pollutants of gas furnace kiln flue gas cooperative control system belongs to the environmental protection field.
Background art:
the gas furnace kiln is a thermal device which takes natural gas as fuel to burn and convert to generate heat in industrial production and carries out smelting, melting, roasting, heating, dry distillation and the like on materials or workpieces, and is widely applied to industries such as steel, coking, petrifaction, chemical industry and the like. Because the fuel is natural gas, sulfur dioxide (SO) in the flue gas2) The smoke content is low, and special desulfurization and dust removal facilities do not need to be configured. However, the flue gas contains pollutants such as nitrogen oxide (NOx), black smoke and the like, and the flue gas amount of the discharged flue gas is small and the temperature is low, so that the traditional SCR vanadium-titanium catalyst (with the temperature range of 310 ℃ and 420 ℃) is difficult to be applied and cannot meet the atmospheric emission standard of furnaces or boilers.
In recent years, low-temperature denitration catalysts (minimum temperature)>180 ℃ and provides technical support for realizing the standard emission of the gas furnace flue gas NOx. However, this technique requires the hydrolysis of ammonia or urea to produce ammonia (NH)3) As a reducing agent. In the reaction process, the phenomenon of ammonia escape inevitably occurs due to uneven flow field, and in addition, the washing cooperative control of the slurry of the desulfurizing tower is not available, so that NH in the discharged flue gas is inevitably generated3The concentration exceeds the standard, and the environment-friendly situation which is stricter day by day can not be met, and NH is researched3Control techniques have become difficult and hot to study.
The invention content is as follows:
in order to solve the defects existing in the prior art, the utility model provides a can realize black cigarette, NOx and NH in the gas furnace kiln flue gas of cooperative control3The technical scheme of the pollutant system is as follows:
be applicable to many pollutants of gas furnace kiln flue gas cooperative control system, including heat transfer system, black cigarette clean system, low temperature deNOx systems and NH that connect gradually3A catalytic oxidation system;
the heat exchange system is connected between the gas furnace kiln and the black smoke purification system;
the black smoke purification system comprises an activated carbon adsorption system and a bypass system; the activated carbon adsorption system is arranged between an inlet and an outlet of the black smoke purification system, the bypass system is connected with the activated carbon adsorption system in parallel, and an electric valve is arranged on the bypass system;
the ammonia injection system comprises a urea supply system and an injection device; the spraying device is arranged in a connecting pipeline between the outlet of the black smoke purification system and the inlet of the low-temperature denitration system, and the spraying device is communicated with the urea supply system through a pipeline;
the NH3The catalytic oxidation system is connected with a chimney through a draught fan;
the flue gas at the outlet of the gas furnace kiln enters a black smoke purification system after being heated by a heat exchange system, is mixed with ammonia gas generated by spraying urea after being purified, enters a low-temperature denitration system for denitration, and enters NH after denitration3The catalytic oxidation system treats ammonia escaping from the flue gas, and finally the ammonia enters a chimney through a draught fan to be discharged.
Preferably, the activated carbon adsorption system adopts replaceable activated carbon adsorption columns.
Preferably, the urea supply system comprises a barreled urea solution and a delivery pump, and the urea solution in the barreled urea solution is transmitted to the injection device through the delivery pump.
Preferably, the injection means employs an air atomising nozzle.
Preferably, the NH is3NH is selected as the catalytic oxidation system3A selective catalytic oxidation catalyst.
Preferably, the NH is3The selective catalytic oxidation catalyst is selected from a noble metal catalyst, a metal oxide catalyst or a molecular sieve type catalyst.
Preferably, the heat exchange system adopts a coil type heat exchanger.
Preferably, the low-temperature denitration system adopts a honeycomb type catalyst.
Preferably, a flow meter is arranged at the outlet of the black smoke purification system.
Preferably, a pressure sensor is arranged at the outlet of the black smoke purification system.
The utility model discloses compare and have following beneficial effect in prior art:
the utility model provides a be applicable to gas furnace kiln flue gas multi-pollutant cooperative control system, pollutants such as black cigarette, NOx and NH3 in this system can the cooperative control handles gas furnace kiln flue gas, realize gas furnace kiln flue gas discharge to reach standard.
The black smoke purification system adopts the active carbon adsorption system and the bypass system which are connected in parallel, when the active carbon adsorption column in the active carbon adsorption system is saturated in adsorption, the electric valve in the bypass system is opened, and the saturated active carbon adsorption column is prevented from blocking the flue; because the black smoke purification system is arranged at the front end of the induced draft fan and in a negative pressure area, the activated carbon adsorption column can be replaced on line without shutdown, and the production period is prolonged.
Compared with the SCR technology, the utility model discloses need not to establish specially the liquid ammonia district or use urea hydrolysis or urea pyrolytic reaction ware, only use barreled urea solution directly to spout the flue and decompose, make the ammonia participate in low temperature denitration reaction, the operation is convenient, and the cost is lower.
The NH of the utility model3The catalytic oxidation system can selectively reduce the ammonia escaping from the flue gas discharged by the low-temperature denitration system into pollution-free N2And H2O, low energy consumption and no secondary pollution, and is an environment-friendly purification technology.
Drawings
FIG. 1 is a schematic diagram of the system configuration in the example;
wherein, 1-a gas furnace kiln; 2-coil heat exchanger; 3-flue; 4-black smoke purification system; 5-an activated carbon adsorption unit; 6-a bypass system; 7-an electric valve; 8-a low temperature denitrification system; 9-NH3A catalytic oxidation system; 10-a draught fan; 11-a chimney; 12-barreling urea solution; 13-a delivery pump; 14-urea solution conduit; 15-atomizing nozzle.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The first embodiment is as follows:
the embodiment of the system is suitable for the cooperative control system of multiple pollutants in the flue gas of a gas furnace kiln, as shown in the figure1, the system comprises a coil type heat exchanger 2, a black smoke purification system 4, a low-temperature denitration system 8 and NH which are sequentially connected3A catalytic oxidation system 9; wherein, the coil type heat exchanger 2 is connected between the gas furnace kiln 1 and the black smoke purification system 4, the flue gas at the outlet of the gas furnace kiln 1 enters the black smoke purification system 4 through a coil type heat exchanger shell layer, the temperature of the flue gas at the outlet of the gas furnace kiln 1 is increased to the optimal temperature range of the catalyst in the low-temperature denitration system by the heat exchange medium in the coil type heat exchanger 2 tube layer, in the embodiment, the low-temperature denitration system 8 adopts a honeycomb type catalyst, the design principle of the pore flow rate of the low-temperature catalyst is larger than the minimum ash deposition speed, and the applicable temperature range is 180-380 ℃. The heat exchange medium in the pipe layer 2 of the coil pipe type heat exchanger adopts flue gas, steam or hot water of a boiler, and waste heat recovery and utilization are achieved.
The black smoke purification system 4 comprises an activated carbon adsorption system and a bypass system 6; the activated carbon adsorption system is arranged between the inlet and the outlet of the black smoke purification system 4. An active carbon adsorption unit 5 in the active carbon adsorption system selects a plurality of replaceable active carbon adsorption columns, a bypass system 6 is connected with the active carbon adsorption system in parallel, and an electric valve 7 is arranged on the bypass system 6; a flow meter and a pressure sensor are arranged at the outlet of the black smoke purification system 4, and the opening and closing of the electric valve 7 are controlled through measured pressure and flow signals; when the activated carbon adsorption column is saturated, automatically opening the electric valve 7 according to the pressure and flow logic protection signal, namely opening the bypass to prevent the saturated activated carbon adsorption column from blocking the flue; because the black smoke purification system is arranged at the front end of the draught fan 10 and in a negative pressure area, the activated carbon adsorption column can be replaced on line without shutdown, and the production period is prolonged.
The device also comprises an ammonia injection system, wherein the ammonia injection system comprises a urea supply system and an air atomization nozzle 15; the urea supply system comprises a barreled urea solution 12 and a delivery pump 13, and the urea solution in the barreled urea solution 23 is delivered to the air atomizing nozzle 15 through the delivery pump 13. Air atomizing nozzle 15 sets up in the connecting line between 4 exports of black cigarette clean system and 8 imports of low temperature deNOx systems, and air atomizing nozzle 15 and urea supply system are through urea solution pipeline 14 intercommunication.
The NH3 catalytic oxidation system 9 is induced by windThe machine 10 is connected with a chimney 11, and NH3 is selected as the catalytic oxidation system 93A selective catalytic oxidation catalyst.
The system is used as follows:
after flue gas from an outlet 1 of a gas furnace kiln passes through a coil type heat exchanger 2, the temperature of the flue gas is raised, the flue gas enters a black smoke purification system 4 through a flue 3, black smoke in the flue gas is adsorbed and treated by an activated carbon adsorption unit 5, after the activated carbon adsorption unit 5 is saturated in adsorption, an electric valve 7 on a bypass system 6 is opened to prevent the device from being blocked, urea solution is sprayed into the flue from a barreled urea solution conveying pump through a urea solution pipeline by a nozzle and is mixed with the flue gas treated by the black smoke purification system 4, ammonia gas is prepared by decomposition under the action of the temperature of the flue gas, the urea solution enters a low-temperature denitration system 8 to react with NOx in the flue gas to remove NOx in the flue gas, and the flue gas after reaction3The catalytic oxidation system 9 selectively reduces the ammonia escaping from the flue gas into pollution-free N under the action of the catalyst2And H2And O, discharging the clean flue gas from a chimney 11 through a draught fan 10 after reaching the standard.
Example two:
the further design of this embodiment lies in: NH in the present example3The selective catalytic oxidation catalyst is selected from a noble metal catalyst, a metal oxide catalyst or a molecular sieve type catalyst.
The technical scheme of the utility model is not limited to above-mentioned each embodiment, and the technical scheme that all adopt to equate substitution mode to obtain all falls the utility model discloses the within range that claims.
Claims (10)
1. The utility model provides a be applicable to many pollutants of gas furnace kiln flue gas cooperative control system which characterized in that: comprises a heat exchange system, a black smoke purification system, a low-temperature denitration system and NH which are connected in sequence3A catalytic oxidation system;
the heat exchange system is connected between the gas furnace kiln and the black smoke purification system;
the black smoke purification system comprises an activated carbon adsorption system and a bypass system; the activated carbon adsorption system is arranged between an inlet and an outlet of the black smoke purification system, the bypass system is connected with the activated carbon adsorption system in parallel, and an electric valve is arranged on the bypass system;
the ammonia injection system comprises a urea supply system and an injection device; the spraying device is arranged in a connecting pipeline between the outlet of the black smoke purification system and the inlet of the low-temperature denitration system, and the spraying device is communicated with the urea supply system through a pipeline;
the NH3The catalytic oxidation system is connected with a chimney through a draught fan;
the flue gas at the outlet of the gas furnace kiln enters a black smoke purification system after being heated by a heat exchange system, is mixed with ammonia gas generated by spraying urea after being purified, enters a low-temperature denitration system for denitration, and enters NH after denitration3The catalytic oxidation system treats ammonia escaping from the flue gas, and finally the ammonia enters a chimney through a draught fan to be discharged.
2. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 1, is characterized in that: the active carbon adsorption system adopts an alternative active carbon adsorption column.
3. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 2, wherein: the urea supply system comprises a barreled urea solution and a delivery pump, and the urea solution in the barreled urea solution is transmitted to the spraying device through the delivery pump.
4. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 3, wherein: the spraying device adopts an air atomizing nozzle.
5. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln according to any one of claims 1 to 4, wherein: the NH3NH is selected as the catalytic oxidation system3A selective catalytic oxidation catalyst.
6. The multi-pollutant fume for gas furnace kiln as defined in claim 5A coordinated control system, characterized by: the NH3The selective catalytic oxidation catalyst is selected from a noble metal catalyst, a metal oxide catalyst or a molecular sieve type catalyst.
7. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 6, wherein: the heat exchange system adopts a coil type heat exchanger.
8. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 7, wherein: the low-temperature denitration system adopts a honeycomb catalyst.
9. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 8, wherein: and a flow meter is arranged at the outlet of the black smoke purification system.
10. The system for the cooperative control of multiple pollutants in flue gas of a gas furnace kiln as claimed in claim 9, wherein: and a pressure sensor is arranged at the outlet of the black smoke purification system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022128917.3U CN213090500U (en) | 2020-09-25 | 2020-09-25 | Be applicable to many pollutants of gas furnace kiln flue gas cooperative control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022128917.3U CN213090500U (en) | 2020-09-25 | 2020-09-25 | Be applicable to many pollutants of gas furnace kiln flue gas cooperative control system |
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| CN213090500U true CN213090500U (en) | 2021-04-30 |
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| CN202022128917.3U Active CN213090500U (en) | 2020-09-25 | 2020-09-25 | Be applicable to many pollutants of gas furnace kiln flue gas cooperative control system |
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Address after: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: National Energy Group Science and Technology Research Institute Co.,Ltd. Address before: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |