CN211988033U - Flue gas denitration system of methane generator set - Google Patents
Flue gas denitration system of methane generator set Download PDFInfo
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- CN211988033U CN211988033U CN202020192142.3U CN202020192142U CN211988033U CN 211988033 U CN211988033 U CN 211988033U CN 202020192142 U CN202020192142 U CN 202020192142U CN 211988033 U CN211988033 U CN 211988033U
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Abstract
The utility model discloses a marsh gas generating set flue gas denitration system, store the system including the aqueous ammonia, aqueous ammonia injection system, the compressed air system, the SCR reactor, flue gas cooling system and the automatic soot blowing system of catalyst are controlled by PLC jointly and add a machine control system, the SCR reactor includes the import flue, reactor body and export flue, marsh gas generating set's exhaust emission pipeline and import flue butt joint, export flue and exhaust stack or waste heat recovery system pipeline butt joint, import flue intercommunication has flue gas cooling system, the aqueous ammonia storage system includes the aqueous ammonia storage tank, unload the ammonia pump, eyewash ware and fire water automatic spray nest of tubes, aqueous ammonia injection system includes the aqueous ammonia jet pump, aqueous ammonia spray gun and aqueous ammonia pipeline, the automatic soot blowing system of catalyst includes the sound wave soot blower and blows the pipeline. The system has the advantages of high denitration efficiency, lower ammonia escape rate, reasonable ammonia water consumption, no other pollution and economic and reasonable energy consumption.
Description
Technical Field
The utility model relates to a flue gas treatment technical field especially relates to a biogas generator set flue gas denitration system.
Background
On the basis of biogas generated by landfill in a large valley type landfill site, the biogas is conveyed to a plurality of biogas internal combustion engine units in a plant area daily to generate electricity, and the daily generated energy exceeds hundreds of thousands of degrees. In order to achieve qualified NOx emission of the generator sets, tail gas denitration treatment needs to be carried out on the generator sets, so that the smoke emission meets the requirements of national standards. Selective Catalytic Reduction (SCR) for flue gas denitration has been developed rapidly in recent years and is widely used in europe and japan, and the catalytic reduction for flue gas denitration is currently the most widely used technology. The worldwide popular SCR process is mainly divided into an ammonia method SCR and a urea method SCR. Both methods utilize the reduction function of NH3 on NOx to reduce NOx (mainly NO) into N2 and water which have little influence on the atmosphere under the action of a catalyst. The urea process also involves re-solidification of the gasified urea during the evaporation of the urea-water solution, which also affects the effective decomposition of the urea, and the melamine complex produced by the pyrolysis of the urea-water solution deposits on the catalyst surface and in the reactor volume, affecting the reactivity of the catalyst. The incomplete decomposition of the urea aqueous solution can increase the dosage of urea, increase the escape rate of ammonia and cause secondary pollution. The ammonia method is to directly use liquid ammonia or ammonia water as a reducing agent to participate in the reaction. Although the liquid ammonia has low transportation cost and cheap reactant cost, the liquid ammonia needs to be operated at high pressure and has high toxicity and great potential safety hazard. Although the ammonia water has high operation cost and high storage cost, the ammonia water has relatively low toxicity, is atomized by the denitration atomizing nozzle and then directly sprayed into the flue to be rapidly gasified into ammonia gas, and has no other chemical reaction. Therefore, the ammonia process SCR process using ammonia water as the denitration reducing agent is the subject of the research and development technology of the system.
Disclosure of Invention
The utility model discloses to prior art not enough, the technical problem that solve provides a biogas generating set flue gas denitration system, carry out denitration treatment to biogas generating set tail gas based on Selective Catalytic Reduction (SCR) method, choose the aqueous ammonia for use as the denitration reductant, denitration efficiency is high, and the ammonia escape rate is lower, and the aqueous ammonia consumption is reasonable, and the operation is stable, when reaching flue gas N0x emission standard, can not cause other pollutions, and the energy consumption is economical reasonable.
The utility model discloses a make above-mentioned technical problem solve through following technical scheme.
The flue gas denitration system of the biogas generator set comprises an ammonia water storage system, an ammonia water injection system, a compressed air system, an SCR reactor, a flue gas cooling system and a catalyst automatic soot blowing system which are controlled by a PLC and an on-board computer control system together, wherein the SCR reactor comprises an inlet flue, a reactor body and an outlet flue, a tail gas discharge pipeline of the biogas generator set is butted with the inlet flue, the outlet flue is butted with an exhaust chimney or a waste heat recovery system pipeline, the inlet flue is communicated with the flue gas cooling system, the reactor body is provided with a catalyst layer group, the ammonia water storage system comprises an ammonia water storage tank, an ammonia unloading pump and a fire water automatic spray pipe group, ammonia water conveyed by a tank car is conveyed to the ammonia water storage tank through the ammonia unloading pump for storage, the ammonia water storage tank is provided with an ammonia gas leakage detector, and the fire water automatic spray pipe group is, the side of aqueous ammonia storage tank is provided with the eyewash ware of taking spray assembly, aqueous ammonia injection system includes aqueous ammonia jet pump, aqueous ammonia spray gun and aqueous ammonia conveying pipeline, aqueous ammonia passes through in the aqueous ammonia storage tank aqueous ammonia jet pump deliver for install the import flue aqueous ammonia spray gun, and with come from compressed air system's compressed air mixes atomizing and becomes the ammonia injection to mix with the flue gas in the import flue again, the automatic soot blowing system of catalyst includes the sound wave soot blower and blows the soot pipeline, the sound wave soot blower with catalyst bed group corresponds the setting and with compressed air system is the power supply.
Preferably, the ammonia water storage tank is made of glass fiber reinforced plastic, an ammonia water cofferdam is arranged around the ammonia water storage tank, a water outlet is formed in the ammonia water storage tank, and a rainproof sunshade is arranged above the ammonia water storage tank.
Preferably, the ammonia water storage tank is provided with a breather valve and a magnetic turning plate liquid level meter.
Preferably, a flue gas rectifier is installed in the inlet flue.
Preferably, the SCR reactor is a fixed bed parallel channel type, and the front end of each layer of catalyst is provided with an abrasion-resistant layer.
Preferably, the flue gas cooling system comprises a cooling fan and an air supply pipeline, and an electric regulating valve and a manual sealing butterfly valve are arranged on the air supply pipeline.
Preferably, the compressed air system comprises an air compressor, a compressed air tank and a compressed air pipeline, and compressed air passing through the air compressor enters the compressed air tank to be stored after passing through a precision filter and an oil-water separator.
Preferably, the SCR reactor is divided into a vertical type and a horizontal type, an outlet flue of the vertical type SCR reactor is in butt joint with an exhaust chimney, and an outlet flue of the horizontal type SCR reactor is in butt joint with a waste heat recovery system pipeline.
Preferably, the SCR reactor main body supporting structure is a steel bracket and is provided with a platform and an escalator.
The utility model has the advantages that:
1. the system is easy to build, low in investment, maintenance and operation cost, simple and convenient to operate, simple to observe, monitor and maintain, small in number of operators and stable in operation;
2. the system discharges smoke by means of smoke discharge pressure of the biogas generator set and chimney suction, and a draught fan is not needed, so that the investment cost is reduced, and the energy is saved and the consumption is reduced;
the SCR reactor catalyst is contained in a modular assembly for ease of handling, installation and replacement. A soot blower is arranged between catalyst layers of the SCR reactor and used for blowing off dust and SCR reaction byproducts deposited on the catalyst so as to reduce the pressure drop of the reactor, and the front end of each layer of catalyst is provided with a wear-resistant layer so as to weaken the scouring action of fly ash on the catalyst;
4. the system is provided with a PLC and an upper computer control system, an engineer or an operator can control and monitor all denitration system equipment and important parameters in a control room, the operation of each equipment is automatically controlled according to programs through various analysis and measurement instruments configured by the system, and the communication of the central control system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Description of reference numerals: the device comprises a 1-SCR reactor, a 2-ammonia water storage tank, a 3-ammonia discharging pump, a 4-fire water automatic spray pipe group, a 5-ammonia water injection pump, a 6-ammonia water spray gun, a 7-air compressor, an 8-compressed air tank, a 9-inlet flue, a 10-reactor body, an 11-outlet flue, a 12-exhaust chimney, a 13-flue gas rectifier, a 14-catalyst layer group and a 15-sound wave soot blower.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the utility model discloses biogas generating set flue gas denitration system, including aqueous ammonia storage system, aqueous ammonia injection system, compressed air system, SCR reactor 1, flue gas cooling system and the automatic soot blowing system of catalyst and be controlled by PLC and add a computer control system jointly, this flue gas denitration system adopts the reductant to be the aqueous ammonia, and the aqueous ammonia adopts demineralized water to prepare, and concentration is 20% to 25%, and high temperature resistant catalyst is selected to the catalyst. The performance indexes are that the denitration efficiency is not less than 93 percent, the final NOx emission concentration is not more than 50mg/Nm3 according to the 6 percent reference oxygen concentration, and the ammonia escape rate is not more than 5 ppm. The system is provided with a set of PLC and a host computer control system, and the operator station picture can simultaneously monitor and control the operation of equipment in the system and realize the communication in the central control system.
The main body supporting structure of the SCR reactor 1 is a steel bracket, and a platform and an escalator (not shown in the figure) are arranged according to the requirements of overhaul and maintenance. The SCR reactor 1 comprises an inlet flue 9, a reactor body 10 and an outlet flue 11, the SCR reactor 1 is divided into a vertical type and a horizontal type, the outlet flue 11 of the vertical SCR reactor 1 shown in the figure 1 is butted with an exhaust chimney 12, and the outlet flue 11 of the horizontal type SCR reactor 1 is butted with a waste heat recovery system pipeline. The tail gas discharge pipeline of the biogas generator set is in butt joint with the inlet flue 9, the inlet flue 9 is communicated with the flue gas cooling system, specifically, the flue gas cooling system comprises a cooling fan and an air supply pipeline, and an electric regulating valve and a manual sealing butterfly valve are arranged on the air supply pipeline. The flue gas cooling system has the function of reducing the temperature of the flue gas from 500 ℃ to 380 ℃ and preventing the catalyst from losing activity due to high temperature. The reactor body 10 is provided with a catalyst layer group 14, and a flue gas rectifier 13 is installed in the inlet flue 9, so that flue gas horizontally passes through catalyst holes, and the abrasion to the catalyst is reduced. The SCR reactor 1 is a fixed bed parallel channel type, and the front end of each layer of catalyst is provided with a wear-resistant layer, so that the scouring effect of fly ash on the catalyst is weakened.
The automatic catalyst soot blowing system comprises a sound wave soot blower 15 and a soot blowing pipeline, wherein the sound wave soot blower 15 is arranged corresponding to the catalyst layer group 14 and takes the compressed air system as a power source. The acoustic wave soot blower 15 can keep the catalyst continuously clean, the soot cleaning is thorough, no dead angle is left, the catalytic activity of the catalyst on the denitration reaction is utilized to the maximum extent and the best, the service life of the catalyst is prolonged, and the maintenance cost of the SCR is reduced.
The ammonia water storage system includes ammonia water storage tank 2, unloads ammonia pump 3 and fire water automatic spray nest of tubes 4, ammonia water storage tank 2 is the glass steel material, set up the ammonia water cofferdam and set up the outlet around ammonia water storage tank 2, 2 tops of ammonia water storage tank set up rain-proof sunshade, prevent sunshine to the insolate of ammonia water storage tank. The ammonia water storage tank 2 is provided with a breather valve and a magnetic turning plate liquid level meter. The aqueous ammonia that transports through the tank car passes through unload ammonia pump 3 and carry aqueous ammonia storage tank 2 stores, aqueous ammonia storage tank 2 is provided with ammonia leakage detector, the top of aqueous ammonia storage tank 2 is provided with fire water automatic spray nest of tubes 4, when taking place the ammonia and reveal, the ammonia concentration that the system can monitor automatically exceeds standard, will send alarm signal to on feeding back the host computer, remind operating personnel to look over to the scene. And automatically starting the fire-fighting water automatic spraying pipe group 4, spraying tap water or fire-fighting water, and diluting ammonia gas. When the ammonia concentration returns to normal, the device is automatically closed. The side of aqueous ammonia storage tank 2 is provided with the eyewash ware of taking spray assembly, leads to the ammonia to be stained with after-body can in time wash when personnel's maloperation.
The ammonia water injection system comprises an ammonia water injection pump 5, an ammonia water spray gun 6 and an ammonia water conveying pipeline, wherein the ammonia water in the ammonia water storage tank 2 is conveyed to the ammonia water spray gun 6 installed in the inlet flue 9 through the ammonia water injection pump 5, and is mixed with compressed air from the compressed air system, atomized into ammonia gas and sprayed into the inlet flue 9 to be mixed with flue gas.
The compressed air system comprises an air compressor 7, a compressed air tank 8 and a compressed air pipeline, and compressed air passing through the air compressor 7 enters the compressed air tank 8 for storage after passing through a precision filter and an oil-water separator.
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; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. Biogas generating set flue gas deNOx systems, characterized by: including aqueous ammonia storage system, aqueous ammonia injection system, compressed air system, SCR reactor (1), flue gas cooling system and the automatic soot blowing system of catalyst and be controlled by PLC jointly and add a machine control system, SCR reactor (1) is including import flue (9), reactor body (10) and export flue (11), biogas generator set's exhaust emission pipeline with import flue (9) butt joint, export flue (11) and exhaust stack (12) or waste heat recovery system pipeline butt joint, import flue (9) intercommunication has flue gas cooling system, reactor body (10) are provided with catalyst layer group (14), aqueous ammonia storage system includes aqueous ammonia storage tank (2), unloads ammonia pump (3) and fire water automatic spray nest of tubes (4), the aqueous ammonia that transports through the tank car passes through unload ammonia pump (3) carry aqueous ammonia storage tank (2) to be stored, the ammonia water storage tank (2) is provided with an ammonia gas leakage detector, the fire water automatic spray pipe group (4) is arranged above the ammonia water storage tank (2), an eye washer with a spray assembly is arranged beside the ammonia water storage tank (2), the ammonia water injection system comprises an ammonia water injection pump (5), an ammonia water spray gun (6) and an ammonia water conveying pipeline, the ammonia water in the ammonia water storage tank (2) is conveyed to the ammonia water spray gun (6) arranged on the inlet flue (9) through the ammonia water jet pump (5), and is mixed with compressed air from the compressed air system to be atomized into ammonia gas which is sprayed into the inlet flue (9) and then is mixed with flue gas, the automatic catalyst soot blowing system comprises a sound wave soot blower (15) and a soot blowing pipeline, wherein the sound wave soot blower (15) is arranged corresponding to the catalyst layer group (14) and takes the compressed air system as a power source.
2. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: ammonia water storage tank (2) are the glass steel material, set up the ammonia water cofferdam and set up the outlet around ammonia water storage tank (2), ammonia water storage tank (2) top sets up rain-proof sunshade.
3. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the ammonia water storage tank (2) is provided with a breather valve and a magnetic turning plate liquid level meter.
4. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: and a flue gas rectifier (13) is arranged in the inlet flue (9).
5. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the SCR reactor (1) is of a fixed bed parallel channel type, and the front end of each layer of catalyst is provided with a wear-resistant layer.
6. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the flue gas cooling system comprises a cooling fan and an air supply pipeline, wherein an electric regulating valve and a manual sealing butterfly valve are arranged on the air supply pipeline.
7. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the compressed air system comprises an air compressor (7), a compressed air tank (8) and a compressed air pipeline, and compressed air passing through the air compressor (7) enters the compressed air tank (8) to be stored after passing through a precision filter and an oil-water separator.
8. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the SCR reactor (1) is divided into a vertical type and a horizontal type, an outlet flue (11) of the vertical SCR reactor (1) is in butt joint with an exhaust chimney (12), and an outlet flue (11) of the horizontal type SCR reactor (1) is in butt joint with a waste heat recovery system pipeline.
9. The flue gas denitration system of the biogas generator set as recited in claim 1, wherein: the SCR reactor (1) main body supporting structure is a steel bracket and is provided with a platform and an escalator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020192142.3U CN211988033U (en) | 2020-02-21 | 2020-02-21 | Flue gas denitration system of methane generator set |
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| CN202020192142.3U CN211988033U (en) | 2020-02-21 | 2020-02-21 | Flue gas denitration system of methane generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117643784A (en) * | 2023-12-20 | 2024-03-05 | 中科新天地（合肥）环保科技有限公司 | Multi-pollutant cooperative treatment control method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117643784A (en) * | 2023-12-20 | 2024-03-05 | 中科新天地（合肥）环保科技有限公司 | Multi-pollutant cooperative treatment control method and system |
| CN117643784B (en) * | 2023-12-20 | 2024-07-19 | 中科新天地（合肥）环保科技有限公司 | Multi-pollutant cooperative treatment control method and system |
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