CN217829572U - SCR flue gas denitration system - Google Patents
SCR flue gas denitration system Download PDFInfo
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- CN217829572U CN217829572U CN202221641342.8U CN202221641342U CN217829572U CN 217829572 U CN217829572 U CN 217829572U CN 202221641342 U CN202221641342 U CN 202221641342U CN 217829572 U CN217829572 U CN 217829572U
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- flue gas
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- compressed air
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Abstract
The utility model discloses a SCR flue gas denitration system, which comprises an ammonia water conveying unit, a compressed air conveying unit, a flue, a raw flue gas conveying unit, an ammonia water atomization spray gun, a mixed flow device, an SCR denitration reactor and a clean flue gas recovery device, wherein the ammonia water conveying unit comprises an ammonia water storage device which is communicated with a first inlet of the ammonia water atomization spray gun through the ammonia water conveying pipe; the compressed air conveying unit comprises a gas storage tank for storing compressed air, and the gas storage tank is communicated with a second inlet of the ammonia water atomization spray gun through a compressed air conveying pipe. The utility model discloses a direct transport aqueous ammonia of inverter type aqueous ammonia displacement pump realizes that automatically regulated gives power, can realize the accurate control to the aqueous ammonia flow, through the combination of aqueous ammonia atomizing spray gun and mixed flow device, realizes the accurate control of former flue gas and ammonia flow field distribution, utilizes the high temperature heat direct evaporation aqueous ammonia of former flue gas, need not to set up other complicated equipment such as aqueous ammonia evaporimeter and dilution fan, and the working costs is low, system simple structure.
Description
Technical Field
The utility model relates to a flue gas denitration technical field, in particular to SCR flue gas denitration system.
Background
The most commonly used reducing agents for the SCR flue gas denitration system are three types: liquid ammonia, ammonia water and urea. Liquid ammonia is almost 100% pure ammonia, is a gas at atmospheric pressure, must be transported and stored under pressure, requires extraordinary caution for routine maintenance, and is highly dangerous. The urea is a nontoxic and harmless chemical product, is a common fertilizer for agriculture, has no explosion possibility and no danger, but if the denitration system adopts the urea as a reducing agent, the urea needs to be decomposed into ammonia gas firstly, and the urea needs to be subjected to two processes of urea pyrolysis or urea hydrolysis, so that the system is complex, and the investment and operating cost is high. In comparison, ammonia water with moderate safety, simple system and wide application is often selected as a reducing agent in an SCR flue gas denitration system. The ammonia water used for denitration is usually 10-25% in concentration, is colorless transparent liquid, is easy to decompose and release ammonia gas, has a smaller ammonia water diffusion range than liquid ammonia, is easy to control in concentration range, does not need a pressure container for storage, and is safer than liquid ammonia.
In the SCR flue gas denitration system, an ammonia water supply system simultaneously ensures denitration efficiency and ammonia escape rate, and an accurate control means is required for the supply amount and concentration distribution of ammonia water. The ammonia water supply system of the traditional SCR flue gas denitration system is provided with an ammonia water evaporator which is mainly used for gasifying ammonia water at high temperature and introducing ammonia gas into original flue gas for mixing so as to facilitate the uniform distribution of the ammonia gas, and a heat source generally adopts a hot flue gas, steam or electric heating mode. The ammonia water conveying and metering mode generally adopts a metering and distributing module, and the ammonia water conveying and metering mode is composed of a series of regulating valves, liquid supply pipes, backflow pipes and the like, the overall structure of the system is complex in arrangement, and in the actual operation process, the traditional ammonia water supply system also has the defects of high failure rate, high operation cost and the like.
SUMMERY OF THE UTILITY MODEL
To the technical problem who mentions in the background art, the utility model provides a need not external heat source and system simple structure, running cost low, efficient SCR flue gas denitration system.
The utility model adopts the following technical proposal: an SCR flue gas denitration system comprises an ammonia water conveying unit, a compressed air conveying unit, a flue, an original flue gas conveying unit, an ammonia water atomizing spray gun, a mixed flow device, an SCR denitration reactor and a clean flue gas recovery device, wherein the original flue gas conveying unit is sequentially communicated with the flue along the circulation direction of flue gas; the raw flue gas output unit is used for conveying high-temperature raw flue gas into the flue; a spray gun port of the ammonia water atomization spray gun penetrates into the flue and is used for inputting atomized ammonia water into the flue; the ammonia water conveying unit comprises an ammonia water storage device, the ammonia water storage device is communicated with a first inlet of the ammonia water atomization spray gun through an ammonia water conveying pipe, and the ammonia water conveying pipe is sequentially connected with a variable-frequency ammonia water positive displacement pump and a first control valve along the conveying direction of ammonia water; the compressed air conveying unit comprises a gas storage tank stored with compressed air, the gas storage tank is communicated with a second inlet of the ammonia water atomization spray gun through a compressed air conveying pipe, and the compressed air conveying pipe is sequentially connected with a pressure stabilizing valve and a second control valve in the flowing direction of the compressed air.
Furthermore, a flowmeter is connected to the ammonia water conveying pipe and is positioned at the downstream of the variable-frequency ammonia water positive displacement pump.
Furthermore, the outlet of the SCR denitration reactor is also connected with a flue gas monitoring instrument, and the variable-frequency ammonia water displacement pump is interlocked with the flue gas monitoring instrument and used for automatically adjusting the operating frequency according to the counting value of the flue gas monitoring instrument.
Further, a plurality of layers of denitration catalysts are sequentially arranged in the SCR denitration reactor, and the denitration catalysts can be selected from a plurality of catalysts in a honeycomb type, a plate type or a corrugated plate type.
Compared with the prior art, the utility model has the advantages of: the utility model relates to a SCR flue gas denitration system adopts inverter type aqueous ammonia displacement pump directly to carry reductant aqueous ammonia, can realize automatically regulated and exert oneself, need not aqueous ammonia measurement distribution module, need not to set up the back flow, can realize the accurate control to aqueous ammonia flow; the accurate control of the distribution of the original flue gas and the ammonia gas flow field is realized through the combination of the ammonia water atomization spray gun and the mixed flow device; the ammonia water is directly evaporated by utilizing the high-temperature heat of the original flue gas, other complex equipment such as an ammonia water evaporator, a dilution fan and the like is not required to be arranged, an external heat source is not required to be consumed, the operation cost is low, and the system structure is simpler.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment of the SCR flue gas denitration system of the present invention;
wherein: the device comprises a 1-flue, a 2-raw flue gas conveying unit, a 3-ammonia water atomization spray gun, a 4-mixed flow device, a 5-SCR denitration reactor, a 6-clean flue gas recovery device, a 7-ammonia water storage device, an 8-denitration catalyst, a 9-ammonia water conveying pipe, a 10-variable-frequency ammonia water displacement pump, an 11-first control valve, a 12-gas storage tank, a 13-compressed air conveying pipe, a 14-pressure stabilizing valve, a 15-second control valve, a 16-flow meter and a 17-flue gas monitoring instrument.
Detailed Description
Hereinafter, in order to facilitate understanding of the technical solutions of the present invention by those skilled in the art, further description will be made with reference to the accompanying drawings. It should be understood that the description is intended for purposes of illustration only and is not intended to limit the scope of the present disclosure.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, for the utility model discloses an overall structure schematic diagram of SCR flue gas denitration system embodiment, including flue 1, and along the flue gas circulation direction on in proper order with the former flue gas conveying unit 2 of flue 1 intercommunication, the aqueous ammonia atomizing spray gun 3 that sets up two fluid inlets, mixed flow device 4, SCR denitration reactor 5 and clean flue gas recovery unit 6, wherein, former flue gas conveying unit 2 is used for carrying the former flue gas of high temperature in the flue 1, the spray gun mouth of aqueous ammonia atomizing spray gun 3 wears to establish to the flue 1 in, an aqueous ammonia after the input atomizing in to flue 1.
As shown in fig. 1, the system further comprises an ammonia water conveying unit, wherein the ammonia water conveying unit comprises an ammonia water storage device 7, the ammonia water storage device 7 is communicated with a first inlet of the ammonia water atomization spray gun 3 through an ammonia water conveying pipe 9, and the ammonia water conveying pipe 9 is sequentially connected with a variable-frequency ammonia water displacement pump 10 and a first control valve 11 along the ammonia water conveying direction;
during operation, aqueous ammonia accessible tank car is transported to aqueous ammonia storage device 7, through 3 pressurization transport of inverter type aqueous ammonia positive displacement pump to the first entry with 1 direct mount's of flue aqueous ammonia atomizing spray gun 3, the quantity of aqueous ammonia atomizing spray gun 3 can set up 1, also can set up many as required, during concrete implementation, can set up flowmeter 16 on aqueous ammonia conveyer pipe 9, flowmeter 16 is located the low reaches of inverter type aqueous ammonia positive displacement pump 10 for the flow of real-time supervision aqueous ammonia.
As shown in fig. 1, this system still includes the compressed air delivery unit, and the compressed air delivery unit includes storage has compressed air's gas holder 12, and gas holder 12 passes through compressed air delivery pipe 13 intercommunication with the second entry of aqueous ammonia atomizing spray gun 3, and compressed air delivery pipe 13 has connected gradually surge damping valve 14 and second control valve 15 along the direction that compressed air flows. When the device works, compressed air in the air storage tank 12 is conveyed through the compressed air conveying pipe 13, passes through the pressure stabilizing valve 14, controls the air supply pressure to be 0.3-0.5MPa, and is conveyed to the second inlet of the ammonia water atomization spray gun 3.
In this embodiment, aqueous ammonia atomizing spray gun 3 is provided with two imports, first entry and second entry promptly, and wherein first entry is the aqueous ammonia import, and the second entry is the compressed air import. When the spraying device works, the first control valve 11 and the second control valve 15 are opened, the ammonia water in the spraying gun is atomized into small liquid drops under the action of compressed air, the atomized particle size can be smaller than 100 mu m, and the small liquid drops are directly sprayed into a flue.
When the ammonia gasification furnace works, high-temperature raw flue gas is input into the flue 1 by the raw flue gas conveying unit 2 from the upstream, the high-temperature raw flue gas is mixed with ammonia water sprayed by the ammonia water atomization spray gun 3, and the ammonia water is rapidly gasified into ammonia gas under the high-temperature heat of the raw flue gas. Flue gas and ammonia mix in flue 1, and the mixed gas carries out the evenly distributed of flow field through mixed flow device 6, guarantees that at the flue cross section direction perpendicular with the flue gas flow direction, the temperature, pressure, the component concentration distribution of mixed gas reach the permitting condition of SCR denitration catalyst, and mixed flow device 6 specifically can select a flue gas whirl blender for use, and flue gas whirl blender is prior art, and it does not do this and describe again. The flue gas further enters the SCR denitration reactor 5, and sequentially passes through the SCR denitration catalysts 8 of all layers to carry out catalytic reaction, so that the removal of NOx is realized. The type of the SCR denitration catalyst 8 can be selected from one or more of honeycomb type, plate type or corrugated plate type, and the number of layers is 1-3. The purified flue gas after the denitration treatment further flows to the downstream purified flue gas recovery device 6 for recovery.
This embodiment still is connected with flue gas monitoring instrument 17 in the export of SCR denitration reactor 5 when concrete implementation, and inverter type aqueous ammonia displacement pump 10 is chain with flue gas monitoring instrument 17 for numerical value automatically regulated operating frequency according to the count of flue gas monitoring instrument 17, in order to reach the effect of automatically regulated flow of carrying the aqueous ammonia.
To sum up, the SCR flue gas denitration system of the present invention adopts the variable-frequency ammonia displacement pump 10 to directly transport the reducing agent ammonia, which can realize automatic adjustment of output, without the need of ammonia metering and distributing module, and the need of setting the return pipe, and can realize accurate control of ammonia flow; the accurate control of the distribution of the original flue gas and the ammonia gas flow field is realized through the combination of the ammonia water atomization spray gun 3 and the mixed flow device 6; the ammonia water is directly evaporated by utilizing the high-temperature heat of the original flue gas, other complex equipment such as an ammonia water evaporator, a dilution fan and the like is not required to be arranged, an external heat source is not required to be consumed, the operation cost is low, and the system structure is simpler.
The above embodiments are only described for the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (4)
1. An SCR flue gas denitration system is characterized by comprising an ammonia water conveying unit, a compressed air conveying unit, a flue (1), an original flue gas conveying unit (2) sequentially communicated with the flue (1) along the flue gas circulation direction, an ammonia water atomizing spray gun (3) provided with two fluid inlets, a mixed flow device (4), an SCR denitration reactor (5) and a clean flue gas recovery device (6); the raw flue gas conveying unit (2) is used for conveying high-temperature raw flue gas into the flue (1); a spray gun mouth of the ammonia water atomization spray gun (3) penetrates into the flue (1) and is used for inputting atomized ammonia water into the flue (1); the ammonia water conveying unit comprises an ammonia water storage device (7), the ammonia water storage device (7) is communicated with a first inlet of the ammonia water atomization spray gun (3) through an ammonia water conveying pipe (9), and the ammonia water conveying pipe (9) is sequentially connected with a variable-frequency ammonia water displacement pump (10) and a first control valve (11) along the ammonia water conveying direction; compressed air delivery unit is including storing compressed air's gas holder (12), gas holder (12) with the second entry of aqueous ammonia atomizing spray gun (3) passes through compressed air conveying pipe (13) intercommunication, compressed air conveying pipe (13) have connected gradually surge damping valve (14) and second control valve (15) along the direction that compressed air flows.
2. The SCR flue gas denitration system according to claim 1, wherein a flow meter (16) is connected to the ammonia water delivery pipe (9), and the flow meter (16) is located at the downstream of the variable-frequency ammonia water positive displacement pump (10).
3. The SCR flue gas denitration system of claim 1 or 2, wherein the outlet of the SCR denitration reactor (5) is further connected with a flue gas monitoring instrument (17), and the variable-frequency ammonia water displacement pump (10) is interlocked with the flue gas monitoring instrument (17) and is used for automatically adjusting the operation frequency according to the counting value of the flue gas monitoring instrument (17).
4. The SCR flue gas denitration system of claim 3, wherein a plurality of layers of denitration catalysts (8) are sequentially arranged in the SCR denitration reactor (5), and the denitration catalysts (8) can be selected from honeycomb type, plate type or corrugated plate type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221641342.8U CN217829572U (en) | 2022-06-28 | 2022-06-28 | SCR flue gas denitration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221641342.8U CN217829572U (en) | 2022-06-28 | 2022-06-28 | SCR flue gas denitration system |
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| CN217829572U true CN217829572U (en) | 2022-11-18 |
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| CN202221641342.8U Active CN217829572U (en) | 2022-06-28 | 2022-06-28 | SCR flue gas denitration system |
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