CN211990217U - Ammonium system is removed to fly ash - Google Patents
Ammonium system is removed to fly ash Download PDFInfo
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- CN211990217U CN211990217U CN202020457426.0U CN202020457426U CN211990217U CN 211990217 U CN211990217 U CN 211990217U CN 202020457426 U CN202020457426 U CN 202020457426U CN 211990217 U CN211990217 U CN 211990217U
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Abstract
The utility model provides a fly ash removes ammonium system, include: a mixing reaction device; the dosing device is connected with the mixing reaction device and is used for preparing alkali liquor and conveying the alkali liquor into the mixing reaction device; the drying device is connected with the mixed reaction device and is used for drying the coal ash treated by the mixed reaction device; and the tail gas treatment device is respectively connected with the mixed reaction device and the drying device and is used for treating tail gas generated in the mixed reaction device and the drying device. The utility model can promote the release of ammonia in the fly ash, thereby reducing the content of ammonium in the fly ash, and avoiding the secondary pollution and the influence on the engineering quality caused by the fly ash in the application process of the cement or concrete industry; the purification treatment of the tail gas also effectively avoids secondary pollution.
Description
Technical Field
The utility model relates to a thermal power plant's burning coal discharges the processing technology field of material, especially relates to a fly ash removes ammonium system.
Background
Fly ash is one of the main solid wastes generated by coal-fired power plants, and the annual output is huge. One ton of raw coal is combusted, and 250-300 kg of fly ash is expected to be generated. Fly ash disposal difficulties are becoming more and more acute for coal fired power plants. Through decades of research and application, the fly ash has certain practical application achievements in the aspects of building engineering, agricultural utilization, heavy metal extraction and the like. Among them, the fly ash as an additive for cement or concrete is the current mainstream utilization mode.
At present, the denitration improvement of coal-fired power plants in China is close to the end sound. The content of nitrogen oxides in flue gas is reduced by adopting SCR (selective catalytic reduction) technology (the technology takes urea or ammonia water as a reducing agent) in a large number of coal-fired units. However, during the actual operation of the SCR process, ammonia (NH) gas inevitably occurs3) And escape. Sulfur trioxide (SO) generated by burning and catalytic oxidation of sulfur (S) in raw coal3) With escaped NH3Side reaction occurs to generate a large amount of ammonium hydrogen sulfate (NH)4HSO4) And ammonium sulfate ((NH)4)2SO4). The two ammonium salts have strong adhesiveness, so that the ammonium salts are adhered and dispersed in the fly ash, and the quality and the resource utilization of the fly ash are influenced.
In the actual application process of the ammonium salt-containing fly ash in the field of cement or concrete, phenomena of bubbling with irritation after pouring, prolonging of cement setting time, mold expansion after pouring of a test piece or an engineering entity and the like can occur, so that the concrete can not obtain the required performance, and even the quality and the service life of the concrete are threatened. Meanwhile, the released ammonia gas can also harm the health of constructors or residents. The phenomenon restricts the resource utilization of the fly ash.
The existing coal-fired power plant coal ash ammonium removal technology has the problems of low ammonium removal rate and lack of tail gas (especially ammonia gas) treatment link, so that secondary pollution is easily caused; and a hot blast stove drying mode is adopted, so that a large amount of dust and tail gas are easily caused.
Therefore, it is necessary to develop a fly ash ammonium removal system, which can improve the quality of fly ash and ensure the safety of fly ash resource utilization.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a fly ash ammonium removal system, which can effectively reduce the ammonium content in the fly ash of coal-fired power plants, and purify the tail gas and reduce the secondary pollution;
the utility model provides a fly ash removes ammonium system, include:
the mixed reaction device is used for mixing and reacting the fly ash and the alkali liquor in the mixed reaction device to promote the release of ammonia gas;
the dosing device is connected with the mixing reaction device and is used for preparing alkali liquor and conveying the alkali liquor into the mixing reaction device;
the drying device is connected with the mixed reaction device and is used for drying the coal ash treated by the mixed reaction device;
and the tail gas treatment device is respectively connected with the mixed reaction device and the drying device and is used for treating tail gas generated in the mixed reaction device and the drying device.
In one embodiment, the dosing device delivers the lye into the mixing reaction device by means of a pump.
In one embodiment, the mixing reactor comprises: the spraying device is arranged at the top of the mixing reaction device, and the horizontal paddle is arranged at the bottom of the mixing reaction device.
In one embodiment, the heat source of the drying device is steam at the tail of a steam turbine.
In one embodiment, the exhaust gas treatment device comprises: dust collector and spray the purifying column, mix reaction unit with the mummification device all passes through dust collector is connected to the spray the purifying column.
According to the embodiment of the utility model, in the mixing reaction device, the fly ash is mixed with the alkali liquor prepared by the dosing device, and the alkali liquor reacts with the fly ash and releases ammonia gas; and conveying the fly ash subjected to the mixing reaction into a drying device for drying, and recovering and piling or transporting the dried fly ash. Meanwhile, tail gas containing ammonia gas generated in the mixing reaction device and the drying device is conveyed to a tail gas treatment device for purification and then is discharged. The utility model can promote the release of ammonia in the fly ash, thereby reducing the content of ammonium in the fly ash, and avoiding the secondary pollution and the influence on the engineering quality caused by the fly ash in the application process of the cement or concrete industry; the purification treatment of the tail gas also effectively avoids secondary pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in 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 view of a fly ash ammonium removal system according to an embodiment of the present invention.
Description of reference numerals:
1: a mixing reaction device; 2: a drying device; 3: a tail gas treatment device; 4: a medicine adding device.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An embodiment of the present invention will be described in detail with reference to fig. 1.
The utility model provides a coal fired power plant's fly ash removes ammonium system, include: a mixing reaction device 1, a drying device 2, a tail gas treatment device 3 and a dosing device 4. The chemical adding device 4 is connected with the mixing reaction device 1, and the chemical adding device 4 is used for preparing alkali liquor and conveying the prepared alkali liquor into the mixing reaction device 1. The mixing reaction device 1 is used for mixing and reacting the fly ash and the alkali liquor to generate ammonia gas, and ammonium salts such as ammonium sulfate and ammonium bisulfate in the fly ash can react with the alkali liquor in the mixing reaction device 1 to release the ammonia gas. The drying device 2 is connected with the mixing reaction device 1, the fly ash after the mixing reaction is conveyed into the drying device 2 from the mixing reaction device 1, the drying device 2 is used for drying the fly ash, and the dried fly ash can be recycled to be applied in the cement or concrete industry. Fly ash can produce the tail gas that contains the ammonia in mixing reaction device 1 and mummification device 2, in order to avoid tail gas emission to go into the air, causes secondary pollution, then sets up tail gas processing apparatus 3 and is connected with mixing reaction device 1 and mummification device 2 respectively, can carry the tail gas in mixing reaction device 1 and the mummification device 2 to tail gas processing apparatus 3 in, discharge after tail gas processing apparatus 3 purifies.
According to the embodiment of the utility model, the coal ash of the coal-fired power plant is mixed with the alkali liquor prepared by the chemical adding device 4 through the mixing reaction device 1, and simultaneously the coal ash reacts with the alkali liquor to release ammonia gas; the fly ash after the mixing reaction is conveyed into a drying device 2 for drying, and the dried fly ash is recovered for piling or transporting. Meanwhile, the tail gas containing ammonia gas generated in the mixing reaction device 1 and the drying device 2 is conveyed to the tail gas treatment device 3 for purification and then discharged.
In some embodiments, the dosing device 4 delivers water into the mixing reaction device 1, where the fly ash reacts with the water and releases ammonia gas.
In some embodiments, a spraying device and a horizontal paddle are arranged in the mixing reaction device 1, the spraying device is arranged at the top of the mixing reaction device 1, and the horizontal paddle is arranged at the bottom of the mixing reaction device 1. The spraying device sprays the alkali liquor from the top of the mixing reaction device 1, so that the contact surface of the fly ash and the alkali liquor is increased, and the fly ash and the alkali liquor can be fully reacted. The horizontal paddle is used for stirring the fly ash, so that the fly ash and the alkali liquor are fully reacted, and further, the generation of ammonia gas is facilitated.
In some embodiments, the source of heat for the drying apparatus 2 is steam from the tail of the steam turbine. The shell of the drying device 2 is provided with a jacket which can be filled with steam, and the fly ash is indirectly dried by high-temperature steam in the jacket. The coal ash is dried by utilizing the steam waste heat of the coal-fired power plant, and the resource is saved. In addition, a horizontal paddle is arranged in the drying device 2, the evaporation of water is accelerated through the rotation of the paddle, and the fly ash is promoted to the device direction of the next link.
In some embodiments, the exhaust gas treatment device 3 comprises: dust collector and spraying purification tower, dust collector are arranged in getting rid of the dust in the tail gas, and spraying purification tower is used for retrieving water and ammonia. Carry the tail gas in mixing reaction unit 1 and the mummification device 2 earlier to dust collector in, the tail gas after the dust removal is carried to the spray purification tower in, spray purification tower from the top to tail gas spray water, make the ammonia fully dissolve in the aquatic and along with falling to spray purification tower bottom under water, spray purification tower at last and retrieve the water of bottom, realized the recovery to the ammonia, the tail gas that remains at last is discharged.
The concrete ammonium removal process of the fly ash ammonium removal system comprises the following steps: the fly ash of a coal-fired power plant is conveyed into the mixing reaction device 1 through a belt, alkali liquor prepared in the dosing device 4 is sprayed through a spraying device in the mixing reaction device 1, the alkali liquor and the fly ash are mixed and reacted, ammonia gas is generated, a horizontal paddle in the mixing reaction device 1 is rotated and stirred through a paddle to accelerate the mixing and reaction of the fly ash and the alkali liquor, and meanwhile, the rotation of the horizontal paddle is also beneficial to pushing the fly ash to move towards the tail part of the mixing reaction device 1 (namely, the part communicated with the drying device 2). The fly ash after the mixing reaction is sent into a drying device 2 through a screw conveyer; in the drying device 2, steam of a coal-fired power plant heats wet fly ash in an indirect contact mode to promote moisture evaporation in the fly ash, and meanwhile, the horizontal paddle rotates to enable the fly ash to be in contact with a heating surface more fully to promote moisture evaporation; the dried fly ash can be recycled and stockpiled or transported outside and is applied to the cement or concrete industry.
In the mixing reaction device 1 and the drying device 2, the fly ash can generate tail gas containing ammonia gas, and the tail gas contains dust. Therefore, tail gas in the mixing reaction device 1 and the drying device 2 is firstly conveyed into the dust removal device for dust removal, then conveyed into the spray purification tower, ammonia is dissolved in water by spraying water to the tail gas, and finally the water is recovered, so that the ammonia is recovered. In addition, negative pressure is always maintained in the mixing reaction device 1 and the drying device 2, so that tail gas is prevented from flowing out of the device.
According to the embodiment of the utility model, the utility model can promote the release of ammonia in the fly ash, thereby reducing the content of ammonium in the fly ash, and avoiding the secondary pollution and the influence on the engineering quality caused by the fly ash in the application process of the cement or concrete industry; the purification treatment of the tail gas also effectively avoids secondary pollution. Meanwhile, the steam waste heat of the coal-fired power plant is reasonably utilized, and the operation cost is reduced.
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 (5)
1. A fly ash ammonium removal system is characterized by comprising:
the mixed reaction device is used for mixing and reacting the fly ash and the alkali liquor in the mixed reaction device to promote the release of ammonia gas;
the dosing device is connected with the mixing reaction device and is used for preparing alkali liquor and conveying the alkali liquor into the mixing reaction device;
the drying device is connected with the mixed reaction device and is used for drying the coal ash treated by the mixed reaction device;
and the tail gas treatment device is respectively connected with the mixed reaction device and the drying device and is used for treating tail gas generated in the mixed reaction device and the drying device.
2. The fly ash ammonium removal system of claim 1, wherein the dosing device delivers the lye into the mixing reaction device by a pump.
3. The fly ash ammonium removal system of claim 1, wherein the mixing reaction device comprises: the spraying device is arranged at the top of the mixing reaction device, and the horizontal paddle is arranged at the bottom of the mixing reaction device.
4. The system of claim 1, wherein the source of heat for the drying device is steam turbine tail steam.
5. The fly ash ammonium removal system of claim 1, wherein the tail gas treatment device comprises: dust collector and spray the purifying column, mix reaction unit with the mummification device all passes through dust collector is connected to the spray the purifying column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020457426.0U CN211990217U (en) | 2020-04-01 | 2020-04-01 | Ammonium system is removed to fly ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020457426.0U CN211990217U (en) | 2020-04-01 | 2020-04-01 | Ammonium system is removed to fly ash |
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| CN211990217U true CN211990217U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318554A (en) * | 2020-04-01 | 2020-06-23 | 大唐环境产业集团股份有限公司 | Ammonium removal system and method for fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318554A (en) * | 2020-04-01 | 2020-06-23 | 大唐环境产业集团股份有限公司 | Ammonium removal system and method for fly ash |
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