CN214345614U - Ammonia recovery device for denitration flue gas fly ash - Google Patents
Ammonia recovery device for denitration flue gas fly ash Download PDFInfo
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- CN214345614U CN214345614U CN202120242515.8U CN202120242515U CN214345614U CN 214345614 U CN214345614 U CN 214345614U CN 202120242515 U CN202120242515 U CN 202120242515U CN 214345614 U CN214345614 U CN 214345614U
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Abstract
The utility model discloses an ammonia recovery device for denitration flue gas fly ash, which relates to the technical field of SCR denitration, wherein the top and the bottom of a separator are respectively communicated with an ammonia recovery tank and a fly ash recovery box; the temperature control structure comprises an inner circulation loop and an outer circulation loop, the inner circulation loop exchanges heat with the inside of the separator through a heat exchange tube, and the outer circulation loop exchanges heat with the inside of the flue gas pipeline behind the air preheater through a heat exchanger. The utility model discloses heat the denitration flue gas flying dust of adsorbing a large amount of ammonia in the separator to separate flying dust and ammonia and collect respectively in flying dust collection box and ammonia recovery jar, ensure that the flying dust can carry out resource utilization, avoid ammonia to escape simultaneously and damage low reaches equipment and influence low reaches equipment work, ensure the normal clear of denitration work, and the ammonia mass concentration in the effective control denitration waste water.
Description
Technical Field
The utility model relates to a SCR denitration technology field, concretely relates to a device that is arranged in separating recovery to adsorbed ammonia in the flue gas flying dust of coming out of stock.
Background
Nitrogen oxides are a typical atmospheric pollutant, which causes environmental problems such as greenhouse effect, ozone layer destruction, acid rain, haze and the like and poses serious threats to human health. Coal combustion is the biggest artificial emission source of nitrogen oxides in China and is environment-friendlyReduction of NOxThe coal-fired power plant needs to be provided with a flue gas denitration device.
The selective catalytic reduction technology is most widely applied to the field of denitration by the advantages of high technical maturity and high denitration efficiency. The SCR flue gas denitration technology is that a proper amount of reducing agent (generally NH3, urea or other nitrogen-hydrogen compounds) is sprayed into flue gas in an oxygen-containing atmosphere, and the reducing agent is selectively mixed with NO in the flue gas at the temperature of 300-420 ℃ under the action of a catalystxReaction is carried out to remove NO in the flue gasxThe purpose of (1).
The efficiency of the existing SCR flue gas denitration device can reach 95% in actual operation, and can basically meet the use requirements, but the ammonia escape control difficulty is increased along with the increase of the denitration efficiency, and the escaped ammonia can cause negative effects of different degrees on the operation of the whole device after entering denitration downstream equipment: if the escaped ammonia can be mixed with SO in the flue gas3Reaction to form NH4HSO4And (NH)4)2SO4，NH4HSO4Can deposit in the air preheater, lead to the blockage of the air preheater and NH4HSO4And (NH)4)2SO4All have corrosiveness to metal, can corrode equipment such as air preheater, pipeline and electrostatic precipitator. Meanwhile, when the mass concentration of ammonia in the desulfurization wastewater is high, the wastewater needs to be treated before being discharged, so that extra cost for wastewater treatment is generated due to the increase of ammonia escape, and the control of the operation cost is not facilitated. In addition, 70-80% of escaped ammonia can be adsorbed on fly ash, so that the fly ash mixed with escaped ammonia becomes a dangerous pollutant, and the resource utilization of the fly ash is limited.
SUMMERY OF THE UTILITY MODEL
The utility model discloses just in order to avoid the weak point that above-mentioned prior art exists, provide an ammonia recovery unit for denitration flue gas flying dust.
The utility model discloses a solve technical problem and adopt following technical scheme: an ammonia recovery device for denitration flue gas fly ash comprises a separation structure and a temperature control structure; the top and the bottom of the separator are respectively communicated with an ammonia gas recovery tank and a fly ash recovery tank, the outlet of the fly ash feed tank is communicated with the inlet of a fly ash feed pump, and the outlet of the fly ash feed pump is communicated with the separator to form the separation structure;
the temperature control structure comprises an inner circulation loop and an outer circulation loop, the temperature controller and a heat exchange tube first circulating pump are sequentially communicated to form the inner circulation loop, the heat exchange tube is arranged in the separator, and the inner circulation loop and the separator perform heat exchange through the heat exchange tube; the temperature controller, the second circulating pump and the heat exchanger are sequentially communicated to form the outer circulating loop, the heat exchanger is located in the rear flue gas pipeline of the air preheater, and the outer circulating loop and the interior of the rear flue gas pipeline of the air preheater exchange heat through the heat exchanger.
Further, the ammonia recovery tank is provided with an air outlet communicated with the inlet of the denitration pipeline, and the air outlet is provided with an ammonia spraying branch valve.
Further, the heat exchange tube is a coiled tube.
Further, the outlet of the fly ash material incoming pump is communicated to the upper part of the separator.
Further, the separator is communicated with a vacuum pump.
Further, the vacuum pump is communicated to the lower part of the separator.
Furthermore, a buffer tank is communicated between the temperature controller and the heat exchanger.
Furthermore, the heat exchange pipe and the spray gun communicated with the inlet of the heat exchange pipe form heat exchange branches, and the heat exchange branches are connected in parallel and communicated with the inner circulation loop.
Further, each heat exchange tube is arranged in the separator from top to bottom.
The utility model provides an ammonia recovery unit for denitration flue gas flying dust has following beneficial effect:
1. the utility model heats denitration flue gas fly ash adsorbing a large amount of ammonia in the separator, so as to separate the fly ash from the ammonia and collect the fly ash in the fly ash recovery box and the ammonia recovery tank respectively, thereby ensuring resource utilization of the fly ash, avoiding ammonia escape to damage downstream equipment and influence the work of the downstream equipment, ensuring the normal operation of denitration work, and effectively controlling the mass concentration of ammonia in the denitration wastewater;
2. the ammonia recovery tank of the utility model can be directly communicated with the inlet of the denitration pipeline, so that the recovered ammonia can be directly used for denitration, the utilization rate of the reducing agent is improved, and the workload and the cost of putting the reducing agent into operation are reduced;
3. the utility model discloses utilize inside preheating of air preheater back flue gas pipeline to realize the heating of flying dust, need not almost additional consumption resource, energy-concerving and environment-protective.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of a partial structure of the present invention.
In the figure:
1. the device comprises a separation structure, 11, a separator, 12, a fly ash feed box, 13, a fly ash feed pump, 14, an ammonia gas recovery tank, 15, an ammonia injection branch valve, 16, a fly ash recovery box, 17 and a vacuum pump; 2. the device comprises a temperature control structure 21, a temperature controller 22, a spray gun 23, a heat exchange pipe 24, a first circulating pump 25, a second circulating pump 26, a buffer tank 27 and a heat exchanger.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-2, the structural relationship is: comprises a separation structure 1 and a temperature control structure 2; the top and the bottom of the separator 11 are respectively communicated with an ammonia recovery tank 14 and a fly ash recovery tank 16, the outlet of the fly ash feed tank 12 is communicated with the inlet of a fly ash feed pump 13, and the outlet of the fly ash feed pump 13 is communicated with the separator 11 to form a separation structure 1; the fly ash feed pump 2 can control the amount of fly ash entering the separator 4 from the fly ash feed box 1;
the temperature control structure 2 comprises an inner circulation loop and an outer circulation loop, the temperature controller 21 and a heat exchange tube 23 are sequentially communicated with a first circulation pump 24 to form the inner circulation loop, the heat exchange tube 23 is arranged in the separator 11, and the inner circulation loop and the interior of the separator 11 exchange heat through the heat exchange tube 23; the temperature controller 21, the second circulating pump 25 and the heat exchanger 27 are sequentially communicated to form an external circulating loop, the heat exchanger 27 is located in the rear flue gas pipeline of the air preheater, and the external circulating loop exchanges heat with the inside of the rear flue gas pipeline of the air preheater through the heat exchanger 27.
The temperature controller 21 is used for transferring heat to the inner circulation loop through the outer circulation loop by taking the heat in the flue gas pipeline behind the air preheater as a heat source, and controlling the temperature of air flowing in the inner circulation loop to be 177-343 ℃;
the temperature controller 21 may employ an XDZB-228113 smart thermostat.
Preferably, the ammonia gas recovery tank 14 is provided with an air outlet communicated with the inlet of the denitration pipeline, and the air outlet is provided with an ammonia injection branch valve 15.
Preferably, the heat exchange tube 23 is a serpentine tube.
Preferably, the outlet of the fly ash loading pump 13 is connected to the upper part of the separator 11.
Preferably, the separator 11 is communicated with a vacuum pump 17, the vacuum pump 41 can fully mix the fly ash with hot air in the separator 4, so as to improve the uniformity of fly ash heating and further improve the separation effect of ammonia and fly ash;
preferably, a vacuum pump 17 is connected to the lower portion of the separator 11.
Preferably, a buffer tank 26 is further communicated between the temperature controller 21 and the heat exchanger 27, and the buffer tank 26 makes the airflow in the external circulation loop flow more stably to ensure the normal operation of heat exchange.
Preferably, the heat exchange pipe 23 and the spray gun 22 communicated with the inlet of the heat exchange pipe form heat exchange branches, and the heat exchange branches are arranged in parallel and communicated with the inner circulation loop.
Preferably, each heat exchange tube 23 is disposed within the separator 11 from top to bottom.
In a specific use, the fly ash feed pump 13 is operated to feed a predetermined amount of fly ash from the fly ash feed tank 12 into the separator 11.
The outer circulation loop exchanges heat with the inside of the flue gas pipeline behind the air preheater through the heat exchanger 27, absorbs heat inside the flue gas pipeline behind the air preheater, and transfers the heat to the inner circulation loop under the control of the temperature controller 21 at the temperature controller 21, so that the temperature of gas in the inner circulation loop is 177-343 ℃.
The gas in the internal circulation loop respectively enters the corresponding heat exchange tubes 23 through the plurality of spray guns 22 arranged in parallel, and exchanges heat with the inside of the separator 11 through the heat exchange tubes 23, so that the heat is transferred to the inside of the separator 11, and the fly ash adsorbing a large amount of ammonia is heated, so that the fly ash and the ammonia are separated;
the separated ammonia moves upwards, is collected in an ammonia gas recovery tank 14 communicated with the top of the separator 11, and can be sprayed to the inlet of the denitration pipeline as a reducing agent by opening an ammonia spraying branch valve 15 to participate in denitration reaction; the separated fly ash moves downwards and is collected in a fly ash recovery box 16 communicated with the bottom of the separator 11, so that the fly ash can be recycled.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; 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 technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides an ammonia recovery unit for denitration flue gas flying dust which characterized in that: comprises a separation structure (1) and a temperature control structure (2); the top and the bottom of the separator (11) are respectively communicated with an ammonia recovery tank (14) and a fly ash recovery tank (16), the outlet of a fly ash feed tank (12) is communicated with the inlet of a fly ash feed pump (13), and the outlet of the fly ash feed pump (13) is communicated with the separator (11) to form the separation structure (1);
the temperature control structure (2) comprises an inner circulation loop and an outer circulation loop, the temperature controller (21) and a heat exchange tube (23) are sequentially communicated with a first circulation pump (24) to form the inner circulation loop, the heat exchange tube (23) is arranged in the separator (11), and the inner circulation loop and the separator (11) are subjected to heat exchange through the heat exchange tube (23); the temperature controller (21), the second circulating pump (25) and the heat exchanger (27) are sequentially communicated to form the outer circulating loop, the heat exchanger (27) is located in a flue gas pipeline behind the air preheater, and the outer circulating loop exchanges heat with the interior of the flue gas pipeline behind the air preheater through the heat exchanger (27).
2. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: and an air outlet communicated with the inlet of the denitration pipeline is arranged on the ammonia gas recovery tank (14), and an ammonia spraying branch valve (15) is arranged at the air outlet.
3. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: the heat exchange tube (23) is a coiled tube.
4. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: the outlet of the fly ash loading pump (13) is communicated to the upper part of the separator (11).
5. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: the separator (11) is communicated with a vacuum pump (17).
6. The ammonia recovery device for denitration flue gas fly ash according to claim 5, characterized in that: the vacuum pump (17) is communicated to the lower part of the separator (11).
7. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: a buffer tank (26) is also communicated between the temperature controller (21) and the heat exchanger (27).
8. The ammonia recovery device for denitration flue gas fly ash according to claim 1, characterized in that: the heat exchange pipe (23) and the spray gun (22) communicated with the inlet of the heat exchange pipe form heat exchange branches, and the heat exchange branches are connected in parallel and communicated with the inner circulation loop.
9. The ammonia recovery device for denitration flue gas fly ash according to claim 8, characterized in that: each heat exchange tube (23) is arranged in the separator (11) from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120242515.8U CN214345614U (en) | 2021-01-28 | 2021-01-28 | Ammonia recovery device for denitration flue gas fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120242515.8U CN214345614U (en) | 2021-01-28 | 2021-01-28 | Ammonia recovery device for denitration flue gas fly ash |
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| Publication Number | Publication Date |
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| CN214345614U true CN214345614U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120242515.8U Active CN214345614U (en) | 2021-01-28 | 2021-01-28 | Ammonia recovery device for denitration flue gas fly ash |
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| CN (1) | CN214345614U (en) |
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2021
- 2021-01-28 CN CN202120242515.8U patent/CN214345614U/en active Active
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