CN111014228A - Device and method for removing ammonia from boiler fly ash - Google Patents
Device and method for removing ammonia from boiler fly ash Download PDFInfo
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- CN111014228A CN111014228A CN201911049154.9A CN201911049154A CN111014228A CN 111014228 A CN111014228 A CN 111014228A CN 201911049154 A CN201911049154 A CN 201911049154A CN 111014228 A CN111014228 A CN 111014228A
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- fly ash
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 175
- 239000010881 fly ash Substances 0.000 title claims abstract description 109
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 55
- 239000000654 additive Substances 0.000 claims abstract description 27
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a device and a method for removing ammonia from boiler fly ash, which comprises an ammonia-containing fly ash storage tank, a stirrer, an alkaline additive storage tank, a spray liquid storage tank, an evaporator, a first gas-solid separator, a second gas-solid separator, an ammonia storage tank and a fly ash storage tank, wherein ammonia-containing fly ash, alkaline additive and water are mixed and stirred, the mass of the alkaline additive and the mass of the water account for 1-2% of the mass of the ammonia-containing fly ash, an ammonia primary extract and a fly ash primary extract are obtained after stirring, and the ammonia and part of the fly ash in the ammonia primary extract are separated to obtain ammonia; and (3) evaporating the water in the fly ash primary extract, and separating the fly ash and the air in the fly ash primary extract to obtain the fly ash. According to the invention, ammonia and fly ash in the boiler fly ash are separated, so that fly ash meeting industrial application requirements can be obtained, and the separated ammonia gas is recycled for secondary utilization, so that the boiler fly ash is energy-saving and environment-friendly, has a simple structure, is low in cost, is convenient to use and maintain, and has wide practicability.
Description
Technical Field
The invention relates to the field of pollutant treatment, in particular to a device and a method for removing ammonia from boiler fly ash.
Background
NOxIs one of the main pollutants of the atmospheric environment, under the requirements of relevant laws and regulations, the coal-fired power stations in China gradually complete denitration reformation, and denitration equipment after combustion adopts the most extensive SCR technology. The selective catalytic reduction denitration (SCR for short) technology is the most mature and widely applied power plant flue gas denitration technology with highest efficiency at present. SCR denitration technology adopts ammonia as reducing agent to reduce NOxDue to the restriction of chemical principles, catalyst performance and flow field of SCR equipment, ammonia cannot be completely reacted, and the residual ammonia is escaped as ammonia. Domestic and foreign researches show that ammonia escape not only can block the air preheater, but also can affect the properties of the fly ash, namely the ammonia escape can be adsorbed in the boiler fly ash and removed from flue gas by the dust remover along with the fly ash.
The ammonia contained in the boiler fly ash can affect the physical and chemical properties of the fly ash, and is not beneficial to secondary utilization of the fly ash. Meanwhile, in the process of transporting and utilizing the fly ash, ammonia in the fly ash is released continuously, pungent smell is generated, long-term absorption can affect health, and even if the fly ash is subjected to landfill treatment, underground water can be polluted. Therefore, ammonia-containing fly ash requires industrial processing to be satisfactory for sale applications. The prior treatment process is mainly a heat treatment method, namely ammonia is forced to volatilize and release from the fly ash by a high-temperature heating mode, the treatment method needs large energy consumption, and the decomposition of the ammonia can be caused in the high-temperature process to generate NOxAnd so on new contaminants. Therefore, in order to overcome the disadvantages of the direct heat treatment process, a chemical treatment device and a method for effectively removing ammonia in the boiler fly ash by adding a chemical reagent are provided.
Disclosure of Invention
One object of the invention is to provide a device for removing ammonia from boiler fly ash.
In order to achieve the purpose, the invention adopts the technical scheme that:
a boiler fly ash ammonia removal device comprises an ammonia-containing fly ash storage tank, a stirrer, an alkaline additive storage tank, a spray liquid storage tank, an evaporator, a first gas-solid separator, a second gas-solid separator, an ammonia storage tank and a fly ash storage tank, wherein the ammonia-containing fly ash storage tank, the alkaline additive storage tank and the spray liquid storage tank are respectively communicated with an inlet of the stirrer, a solid side outlet of the stirrer is communicated with an inlet of the evaporator, a gas side outlet of the stirrer is communicated with an inlet of the second gas-solid separator, an outlet of the evaporator is communicated with an inlet of the first gas-solid separator, a solid side outlet of the first gas-solid separator is communicated with the fly ash storage tank, and a gas side outlet of the second gas-solid separator is communicated with the ammonia storage tank.
Preferably, the mixer comprises a primary mixer and a secondary mixer, an inlet of the primary mixer is communicated with the ammonia-containing fly ash storage tank, a solid side outlet of the primary mixer is communicated with an inlet of the secondary mixer, a solid side outlet of the secondary mixer is communicated with an inlet of the evaporator, and gas side outlets of the primary mixer and the secondary mixer are communicated with inlets of the second gas-solid separator.
Further preferably, the primary stirrer and the secondary stirrer are arranged up and down.
Further preferably, the stirring power of the primary stirrer is 500-; the stirring power of the secondary stirrer is 100-500W.
Preferably, the mixer comprises a box body, a mixing shaft arranged in the box body and extending along the length direction of the mixing shaft, a mixing paddle arranged on the mixing shaft, and a power source for driving the mixing shaft to rotate, wherein an inlet of the mixer is arranged above the box body on the upstream of the mixing shaft, and a solid side outlet of the mixer is arranged below the box body on the downstream of the mixing shaft.
Further preferably, the mixer further comprises a plurality of nozzles distributed in the box body, and the spraying liquid storage tank is communicated with the plurality of nozzles through a spraying pipe.
Further preferably, the nozzle is an atomizing nozzle.
Preferably, a feeding controller is arranged between the ammonia-containing fly ash storage tank and the alkaline additive storage tank and the inlet of the stirrer.
Preferably, the solid side outlet of the second gas-solid separator is communicated with the ammonia-containing fly ash storage tank.
Preferably, the first gas-solid separator and the second gas-solid separator are cyclone separators.
Preferably, the inlet temperature of the evaporator is 190-210 ℃, and the outlet temperature of the evaporator is 90-110 ℃.
The invention also aims to provide a method for removing ammonia from boiler fly ash.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for removing ammonia from boiler fly ash, comprising:
mixing and stirring ammonia-containing fly ash, alkaline additive and water, wherein the mass of the alkaline additive accounts for 0.5-1% of the mass of the ammonia-containing fly ash, the mass of the water accounts for 1-2% of the mass of the ammonia-containing fly ash, stirring to obtain an ammonia gas primary extract and a fly ash primary extract,
separating ammonia gas and part of fly ash in the ammonia gas primary extract to obtain ammonia gas; and (3) evaporating the water in the fly ash primary extract to dryness to enable the water content in the fly ash primary extract to be 0.2-05%, and separating the fly ash and air in the fly ash primary extract to obtain the fly ash.
Preferably, when the ammonia-containing fly ash, the alkaline additive and the water are mixed and stirred, the mixture is quickly mixed and stirred for 1 to 2 seconds, and then fully reacted and stirred for 4 to 6 minutes.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:
the invention adopts a chemical method to separate ammonia from fly ash in the boiler fly ash, thereby not only obtaining fly ash meeting the requirements of industrial application, but also recycling the separated ammonia for secondary utilization, and having the functions of energy saving and environmental protection.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus in this embodiment;
FIG. 2 is a schematic structural diagram of the primary mixer of this embodiment.
Wherein: 1. an ammonia-containing fly ash storage tank; 2. a first feed controller; 3. a primary stirrer; 31. an electric motor; 32. an inlet; 33. a box body; 34. a stirring shaft; 35. a solid side outlet; 36. a nozzle; 37. a shower pipe; 38. a stirring paddle; 4. a secondary stirrer; 5. an air compressor; 6. an evaporator; 7. a first gas-solid separator; 8. a fly ash storage tank; 9. an evacuation fan; 10. a second gas-solid separator; 11. an ammonia gas collecting fan; 12. an ammonia gas storage tank; 13. a spray liquid storage tank; 14. an alkaline additive storage tank; 15. a second feed controller.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1: an ammonia removal device from boiler fly ash, comprising:
an ammonia-containing fly ash storage tank 1: is used for storing the fly ash containing ammonia,
the first feed controller 2: used for metering and controlling the flow rate of the ammonia-containing fly ash,
alkaline additive storage tank 14: for storing alkaline additives, which may be GaO, Ga (OH)2One of alkaline substances such as NaOH and the like,
the second feed controller 15: for metering and controlling the flow of the basic additive,
a spray liquid storage tank 13: used for storing spraying liquid, the spraying liquid adopts water,
an evaporator 6: the device is used for quickly removing water in the fly ash, has the function of quickly heating and evaporating to dryness, reduces the water content in the fly ash from 1-2% to 0.2-0.5%, has the inlet temperature of about 200 ℃ and the outlet temperature of about 100 ℃ of the evaporator 6, can heat the evaporator 6 by electric energy or heat energy generated by other forms of energy sources such as natural gas combustion and the like,
first gas-solid separator 7: used for separating the fly ash from air, adopts a cyclone separator,
the second gas-solid separator 10: used for separating ammonia gas and fly ash, adopts a cyclone separator,
8, a fly ash storage tank: is used for storing the fly ash after ammonia removal,
ammonia gas storage tank 12: is used for storing the removed ammonia gas,
the mixer, including one-level mixer 3, second grade mixer 4, wherein: the primary stirrer 3 is used for fully mixing and stirring the alkaline additive, the fly ash and the water, and the secondary stirrer 4 is used for enhancing the reaction time of the alkaline additive, the fly ash and the water. As shown in fig. 2: in this embodiment: the primary mixer 3 includes a housing 33, a mixer shaft 34 provided in the housing 33 and extending in the longitudinal direction thereof, a paddle 38 provided on the mixer shaft 34, and a motor 31 as a power source for driving the mixer shaft 34 to rotate, wherein an inlet 32 of the mixer is provided above the housing 33 upstream of the mixer shaft 34, and a solid-side outlet 35 of the mixer is provided below the housing 33 downstream of the mixer shaft 34. The stirrer further comprises a plurality of nozzles 36 which are uniformly distributed in the box body 33 along the length direction of the box body 33, the spraying liquid storage tank 13 is communicated with the plurality of nozzles 36 through a spraying pipe 37, and the nozzles 36 are atomizing nozzles to ensure the uniformity of atomizing and mixing. The secondary mixer 4 has basically the same structure as the primary mixer 3, except that: the length of the box body of the secondary stirrer 4 is greater than that of the box body of the primary stirrer 3, and the stirring power of the primary stirrer 3 is 500-1000W; the stirring power of the secondary stirrer 4 is 100-500W, that is, the power of the motor is different, so that the stirring intensity of the primary stirrer 3 is higher than that of the secondary stirrer 4, and thus, the residence time in the primary stirrer 3 is shorter, about 1-2 minutes, and the residence time in the secondary stirrer 4 is longer, about 4-6 minutes.
The connection mode of each part is as follows:
the ammonia-containing fly ash storage tank 1 is communicated with a first feeding controller 2, the alkaline additive storage tank 14 is communicated with a second feeding controller 15, the first feeding controller 2 and the second feeding controller 15 are respectively communicated with an inlet of a first stirrer 3, a solid side outlet of the first-stage stirrer 3 is communicated with an inlet of a second stirrer 4, a solid side outlet of the second stirrer 4 is communicated with an inlet of an evaporator 6, gas side outlets of the first-stage stirrer 3 and the second stirrer 4 are communicated with an inlet of a second gas-solid separator 10, an outlet of the evaporator 6 is communicated with an inlet of a first gas-solid separator 7, a solid side outlet of the first gas-solid separator 7 is communicated with a fly ash storage tank 8, a gas side outlet of the second gas-solid separator 10 is communicated with an ammonia gas storage tank 12, and a solid side outlet of the second gas-solid separator 10 is communicated with the ammonia-containing fly ash storage. Wherein: the primary stirrer 3 and the secondary stirrer 4 are arranged up and down, and the ammonia-containing fly ash flows into the inlet of the secondary stirrer 4 from the solid side outlet of the primary stirrer 3 by means of gravity. The evaporator 6 is also connected with an air compressor 5, the gas side outlet of the first gas-solid separator 7 is connected with an emptying fan 9, and an ammonia gas collecting fan 11 is connected between the second gas-solid separator 10 and an ammonia gas storage tank 12.
The ammonia removal method of the present apparatus is specifically described below:
the flow of the ammonia-containing fly ash in the ammonia-containing fly ash storage tank 1 is controlled by the first feeding controller 2, the flow of the alkaline additive in the alkaline additive storage tank 14 is controlled by the second feeding controller 15, and the water matched with the spraying liquid storage tank 13 enters the primary stirrer 3 after being atomized by the nozzle 36, wherein: the mass of the alkaline additive accounts for 0.5-1% of the mass of the ammonia-containing fly ash, the mass of the water accounts for 1-2% of the mass of the ammonia-containing fly ash, continuous stirring in a stirrer in the form of dry ash is guaranteed, the flow of the fly ash is mixed and propelled, the fly ash, the alkaline additive and the water are quickly mixed and stirred, a solid part enters a secondary stirrer 4, in the stirring process of the secondary stirrer 4, the water matched with a spray liquid storage tank 13 is atomized through a nozzle 36 and then enters the secondary stirrer 4 to be fully reflected and stirred, the solid part enters an evaporator 6 to be quickly evaporated to dryness, the formed dry ash is driven by compressed air generated by an air compressor 5 and then is sent into a first gas-solid separator 7, finally, the ammonia-removed fly ash is stored in a storage tank 8, and the separated air is emptied by a fan 9; and the ammonia gas generated in the first-stage stirrer 3 and the second-stage stirrer 4 enters a second gas-solid separator 10, the generated pure ammonia gas is collected in an ammonia gas storage tank 12 after being further separated by the second gas-solid separator 10, and the incompletely removed fly ash separated by the second gas-solid separator 10 returns to the ammonia-containing fly ash storage tank 1 again for the next removal cycle.
The core equation of the chemical reaction for adding the alkaline additive is as follows:
NH4+ （aq）+OH- (aq)→NH3(aq)+H2O，
in the alkaline solution of PH > 7, the ammonium ions are continuously decomposed to release ammonia gas.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. A ammonia removing device in boiler fly ash is characterized in that: comprises an ammonia-containing fly ash storage tank, a stirrer, an alkaline additive storage tank, a spray liquid storage tank, an evaporator, a first gas-solid separator, a second gas-solid separator, an ammonia storage tank and a fly ash storage tank, the ammonia-containing fly ash storage tank, the alkaline additive storage tank and the spraying liquid storage tank are respectively communicated with the inlet of the stirrer, the solid side outlet of the stirrer is communicated with the inlet of the evaporator, the gas side outlet of the stirrer is communicated with the inlet of the second gas-solid separator, the outlet of the evaporator is communicated with the inlet of the first gas-solid separator, the outlet at the solid side of the first gas-solid separator is communicated with the fly ash storage tank, and the gas side outlet of the second gas-solid separator is communicated with the ammonia gas storage tank, and the solid side outlet of the second gas-solid separator is communicated with the ammonia-containing fly ash storage tank.
2. The ammonia removal device for boiler fly ash according to claim 1, wherein: the mixer include first-stage mixer, second grade mixer, first-stage mixer, second grade mixer set up from top to bottom, the entry of first-stage mixer with contain the ammonia fly ash storage tank be linked together, the solid side export of first-stage mixer with the entry of second grade mixer be linked together, the solid side export of second grade mixer with the evaporimeter entry be linked together, the gas side export of first-stage mixer, second grade mixer with the second gas-solid separator entry be linked together.
3. The ammonia removal device for boiler fly ash according to claim 2, wherein: the stirring power of the primary stirrer is 500-1000W; the stirring power of the secondary stirrer is 100-500W.
4. The ammonia removal device for boiler fly ash according to claim 1, wherein: the mixer comprises a box body, a mixing shaft, a mixing paddle and a power source, wherein the mixing shaft is arranged in the box body and extends along the length direction of the box body, the mixing paddle is arranged on the mixing shaft, the power source drives the mixing shaft to rotate, an inlet of the mixer is arranged above the box body, which is positioned on the upstream of the mixing shaft, and a solid side outlet of the mixer is arranged below the box body, which is positioned on the downstream of the mixing shaft.
5. The ammonia removal device for boiler fly ash according to claim 4, wherein: the mixer also comprises a plurality of nozzles distributed in the box body, the spraying liquid storage tank is communicated with the plurality of nozzles through a spraying pipe, and the nozzles are atomizing nozzles.
6. The ammonia removal device for boiler fly ash according to claim 1, wherein: and a feeding controller is arranged between the ammonia-containing fly ash storage tank and the alkaline additive storage tank and the inlet of the stirrer.
7. The ammonia removal device for boiler fly ash according to claim 1, wherein: the inlet temperature of the evaporator is 190 ℃ to 210 ℃, and the outlet temperature of the evaporator is 90-110 ℃.
8. A method for removing ammonia from boiler fly ash is characterized by comprising the following steps: the method comprises the following steps:
mixing and stirring ammonia-containing fly ash, alkaline additive and water, wherein the mass of the alkaline additive accounts for 0.5-1% of the mass of the ammonia-containing fly ash, the mass of the water accounts for 1-2% of the mass of the ammonia-containing fly ash, stirring to obtain an ammonia gas primary extract and a fly ash primary extract,
separating ammonia gas and part of fly ash in the ammonia gas primary extract to obtain ammonia gas; and (3) evaporating the water in the fly ash primary extract to dryness to enable the water content in the fly ash primary extract to be 0.2-05%, and separating the fly ash and air in the fly ash primary extract to obtain the fly ash.
9. The method for removing ammonia from boiler fly ash according to claim 8, wherein: when the ammonia-containing fly ash, the alkaline additive and the water are mixed and stirred, the mixture is quickly mixed and stirred for 1 to 2 minutes, and then the mixture is fully reacted and stirred for 4 to 6 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911049154.9A CN111014228A (en) | 2019-10-31 | 2019-10-31 | Device and method for removing ammonia from boiler fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911049154.9A CN111014228A (en) | 2019-10-31 | 2019-10-31 | Device and method for removing ammonia from boiler fly ash |
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| Publication Number | Publication Date |
|---|---|
| CN111014228A true CN111014228A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911049154.9A Pending CN111014228A (en) | 2019-10-31 | 2019-10-31 | Device and method for removing ammonia from boiler fly ash |
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| Country | Link |
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| CN (1) | CN111014228A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437562A (en) * | 2020-05-06 | 2020-07-24 | 大唐环境产业集团股份有限公司 | Fly ash ammonium removal system with preheating device and ammonium removal method |
| CN112591766A (en) * | 2020-11-18 | 2021-04-02 | 苏州西热节能环保技术有限公司 | Device and method for removing and utilizing ammonia in ash of coal-fired power plant |
-
2019
- 2019-10-31 CN CN201911049154.9A patent/CN111014228A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111437562A (en) * | 2020-05-06 | 2020-07-24 | 大唐环境产业集团股份有限公司 | Fly ash ammonium removal system with preheating device and ammonium removal method |
| CN112591766A (en) * | 2020-11-18 | 2021-04-02 | 苏州西热节能环保技术有限公司 | Device and method for removing and utilizing ammonia in ash of coal-fired power plant |
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