CN111530237A - Ammonia gas recovery structure and ammonia gas recovery method for fly ash curing workshop - Google Patents
Ammonia gas recovery structure and ammonia gas recovery method for fly ash curing workshop Download PDFInfo
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- CN111530237A CN111530237A CN202010387199.3A CN202010387199A CN111530237A CN 111530237 A CN111530237 A CN 111530237A CN 202010387199 A CN202010387199 A CN 202010387199A CN 111530237 A CN111530237 A CN 111530237A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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Abstract
The invention provides an ammonia gas recovery structure and an ammonia gas recovery method for a fly ash curing workshop, which can ensure the health of production personnel in the workshop, reduce the corrosion of equipment in the workshop, recycle ammonia gas and reduce secondary pollution. An ammonia gas detector is arranged in the fly ash curing workshop; a collecting air pipe arranged in the fly ash curing workshop is connected with the washing tower; a first-stage filling section, a first-stage spraying section, a second-stage filling section, a second-stage spraying section and a demisting plate are sequentially arranged in the washing tower from bottom to top; the liquid storage tank is connected with a spray water pipe through a circulating pump, and the spray water pipe is connected with the first-stage spray section and the second-stage spray section; the demineralized water input pipeline is connected with the liquid storage tank; the washing tower is connected with an inlet of a centrifugal fan, and the centrifugal fan is connected with a fly ash curing workshop; the liquid reserve tank is connected with the demineralized water pump, and the demineralized water pump is connected with the filter, and the filter links to each other with the demineralized water tank, and the demineralized water tank links to each other with the transfer pump, and the transfer pump links to each other with SNCR system softened water tank.
Description
Technical Field
The invention relates to an ammonia gas recovery structure and an ammonia gas recovery method for a fly ash curing workshop, which are mainly used for the fly ash curing workshop of a household garbage incineration plant.
Background
In recent years, the quantity of garbage produced in our country is increasing day by day, if a large amount of municipal domestic garbage cannot be effectively treated, the urban ecological environment and surrounding water, atmosphere, soil and the like are seriously polluted, and therefore a plurality of garbage incineration plants are correspondingly built. The fly ash generated by the incineration of the garbage belongs to dangerous waste, contains a large amount of heavy metals and has great harm to human bodies and the environment. Therefore, heavy metals in the fly ash need to be stabilized and treated so as to meet the landfill standard before landfill.
Because ammonia water or urea is generally adopted to carry out denitration reaction on the flue gas in the flue gas purification process of waste incineration, a large amount of ammonia is adsorbed in a pore structure of the fly ash, and excessive ammonia can also generate heavy metal ammonia salt compounds in the fly ash semi-dry desulfurization process; most fly ash heavy metal stabilizing agents used in China at present are dithiocarbamate substances, and when fly ash heavy metal stabilizing treatment is carried out, residual ammonia in fly ash or ammonia salt generated in fly ash smoke treatment can be reacted or replaced after the fly ash is contacted with heavy metal stabilizing strong alkaline agents, so that ammonia is free and overflows into the air. In addition, the fly ash stabilizing agent is also decomposed to release ammonia gas.
In many waste incineration plants, the fly ash is chelated in an incineration room and then transferred to a fly ash maintenance workshop for storage, maintenance, sampling and assay, and a large amount of stabilized fly ash is stored in the fly ash maintenance workshop, so that the ammonia smell in the fly ash maintenance workshop is very strong and exceeds the acceptable range of human bodies, and eyes and noses of many operators are injured by irritant gases, and respiratory mucosa diseases are suffered. In addition, the ammonia gas content is too high, and certain potential safety hazard also exists.
In the prior art, dilute acid is often used for neutralizing ammonia gas in a fly ash curing workshop, the method can efficiently remove the ammonia gas, but dilute acid resources are consumed, and the generated acid-containing wastewater needs to be further treated.
In order to solve the ammonia problem of the flying ash curing workshop, ensure the health of production personnel in the workshop, reduce the corrosion of equipment in the workshop, consider the recycle of ammonia, reduce secondary pollution, urgent need to design and develop an ammonia recovery technology of the flying ash curing workshop.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an ammonia gas recovery structure and an ammonia gas recovery method for a fly ash curing workshop, which are reasonable in structural design, so that the health of production personnel in the workshop is ensured, the corrosion of equipment in the workshop is reduced, ammonia gas can be recycled, and secondary pollution is reduced.
The technical scheme adopted by the invention for solving the problems is as follows: the utility model provides a flying dust maintenance workshop's ammonia retrieves structure, includes flying dust maintenance workshop and SNCR system softened water tank, its characterized in that: the device also comprises a collecting air pipe, a desalted water input pipeline, a washing tower, a liquid storage tank, a first-stage filling section, a first-stage spraying section, a second-stage filling section, a second-stage spraying section, a demisting plate, a washing tower outlet air pipe, a centrifugal fan, an exhaust air pipe, a circulating pump, a spray water pipe, a desalted water pump, a filter, a desalted water tank and a transfer pump; an ammonia gas detector is arranged in the fly ash curing workshop; a collecting air pipe is arranged at the top of the fly ash curing workshop and is connected with an air inlet at the bottom of the washing tower; the collecting air pipe is provided with an air exhaust port; a first-stage filling section, a first-stage spraying section, a second-stage filling section, a second-stage spraying section and a demisting plate are sequentially arranged in the washing tower from bottom to top; a liquid storage tank is arranged at the bottom of the washing tower, the liquid storage tank is connected with a spray water pipe through a circulating pump, and the spray water pipe is connected with the first-stage spray section and the second-stage spray section; the demineralized water input pipeline is connected with the liquid storage tank; an upper exhaust port of the washing tower is connected with an inlet of a centrifugal fan through an outlet air pipe of the washing tower, and an outlet of the centrifugal fan is connected with a fly ash curing workshop through an exhaust air pipe; the liquid reserve tank is connected with demineralized water pump inlet, and demineralized water pump export is connected with the filter access, and the filter export links to each other with demineralized water tank import, and demineralized water tank export links to each other with the transfer pump import, and the transfer pump export links to each other with the import of SNCR system softened water tank.
The bottom of the washing tower is provided with a blow-down valve.
The fillers in the first-stage filler section and the second-stage filler section are plastic stepped ring fillers.
The first stage spray section and the second stage spray section are both provided with liquid distributors.
The defogging plate adopts a pall ring water blocking layer structure.
The washing tower is provided with a monitoring window and an inspection manhole.
The exhaust air pipe is provided with an air detector.
The liquid storage tank at the bottom of the washing tower is provided with a ball float valve.
The invention also comprises a DCS control system which is connected with the ammonia gas detector, the ammonia gas alarm device, the washing tower, the circulating pump, the centrifugal fan, the brine removal pump and the transfer pump.
A method for recovering ammonia gas in a fly ash curing workshop is characterized by comprising the following steps: adopt above-mentioned ammonia to retrieve the structure and go on, the step is:
when an ammonia gas detector of the fly ash curing workshop senses that ammonia gas exceeds a set value, ammonia-containing air in the fly ash curing workshop is introduced into an air inlet at the bottom of the washing tower through a collecting air pipe; the air containing ammonia passes through the first-stage filling section, the first-stage spraying section, the second-stage filling section and the second-stage spraying section from bottom to top in the washing tower, and the desalted water is uniformly sprayed into the filling layer of the filling section through the liquid distributors in the first-stage spraying section and the second-stage spraying section and flows downwards along the surface of the filling layer; in the process of countercurrent contact, ammonia in ammonia-containing air is completely dissolved in water and falls into a liquid storage tank of a washing tower along with desalted water; the purified air rises to a demisting plate to remove water mist, and then is conveyed back to a fly ash curing workshop through a centrifugal fan; the ammonia-containing desalted water in the liquid storage tank is pressurized by a circulating pump and then conveyed to a spray pipe, and then conveyed to a first-stage spray section and a second-stage spray section through the spray pipe, and is reacted with ammonia gas and then reflows to the liquid storage tank for recycling; when the circularly used ammonia-containing demineralized water cannot achieve the designed treatment effect, the ammonia-containing demineralized water is conveyed to a demineralized water tank through a demineralized water pump and then conveyed to a soft water tank of an SNCR (selective non catalytic reduction) system through a transfer pump; when the liquid level of the reservoir tank is lowered to a design value, fresh demineralized water is replenished through the demineralized water inlet line.
Compared with the prior art, the invention has the following advantages and effects: structural design is reasonable, need not use chemical, and the operation is safe, and the technique is advanced, and the reliability is high, saves space, is convenient for install and maintain, and is energy-efficient, guarantees that the producer's in the workshop is healthy, reduces the corruption of equipment in the workshop, and the ammonia can recycle, reduces secondary pollution.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, the invention comprises a fly ash maintenance workshop 1, a collecting air pipe 2, a demineralized water input pipeline 3, a washing tower 4, a liquid storage tank 5, a first-stage filling section 6, a first-stage spray section 7, a second-stage filling section 8, a second-stage spray section 9, a demisting plate 10, a washing tower outlet air pipe 11, a centrifugal fan 12, an exhaust air pipe 13, a circulating pump, a spray water pipe 16, a demineralized water pump 17, a filter 18, a demineralized water tank 19, a transfer pump 20, an SNCR system soft water tank 21 and a DCS control system.
The fly ash curing workshop 1 is provided with an ammonia gas detector and an ammonia gas alarm device. When the ammonia gas in the fly ash curing workshop 1 exceeds a set value, the ammonia gas detector can send a signal to the DCS control system, so that the washing tower 4, the circulating pump, the centrifugal fan 12 and other equipment can run.
And a collecting air pipe 2 is arranged at the top of the fly ash curing workshop 1, and the collecting air pipe 2 is connected with an air inlet at the bottom of the washing tower 4. The collecting air pipe 2 is provided with 7 air pumping ports 21, the air pumping ports 21 are positioned at the top of the fly ash maintenance workshop 1, and the diameter of each air pumping port 21 is about 600 mm. The diameter of the collecting air pipe 2 is arranged in a step shape, and a 30 multiplied by 30mm filter screen is arranged at each air extraction opening 21 to prevent sundries from being sucked. The collecting air pipe 2 is designed with a certain gradient to prevent the accumulation of the condensed water in the pipeline, and a drain valve is arranged at the lowest end of the pipeline. The collecting air pipe 2 is made of glass fiber reinforced plastic and has good corrosion resistance. Because the specific gravity of the ammonia gas is lighter, the collecting air pipe 2 is positioned at the top of the fly ash curing plant and is beneficial to gas discharge.
The washing tower 4 is internally provided with a first-stage filling section 6, a first-stage spraying section 7, a second-stage filling section 8, a second-stage spraying section 9 and a demisting plate 10 from bottom to top in sequence.
A liquid storage tank 5 is arranged at the bottom of the washing tower 4, the liquid storage tank 5 is connected with a spray water pipe 16 through a circulating pump, and the spray water pipe 16 is connected with a first-stage spray section 7 and a second-stage spray section 9; the circulating pump is two, is circulating pump 14 and No. two circulating pump 15 respectively, and circulating pump 14 and No. two circulating pump 15 are parallelly connected and are set up. Therefore, the spraying system in the washing tower 4 has a self-circulation function, the spraying liquid in the liquid storage tank 5 is pressurized by the first circulating pump 14 or the second circulating pump 15 and then is conveyed to the spraying water pipe 16, and then is conveyed to the first-stage spraying section 7 and the second-stage spraying section 9 through the spraying water pipe 16, and then is returned to the bottom of the tower for circulation after reacting with ammonia, and the first circulating pump 14 or the second circulating pump 15 is used and prepared.
The demineralized water input pipeline 3 is connected with an inlet of a liquid storage tank 5.
An upper exhaust port of the washing tower 4 is connected with an inlet of a centrifugal fan 12 through an outlet air pipe 11 of the washing tower, and an outlet of the centrifugal fan 12 is connected with the bottom of the fly ash curing workshop 1 through an exhaust air pipe 13.
The export of liquid reserve tank 5 and demineralized water pump 17 access connection, demineralized water pump 17 export and 18 access connections of filter, the export of filter 18 links to each other with demineralized water tank 19 import, and demineralized water tank 19 export links to each other with transfer pump 20 import, and transfer pump 20 export links to each other with the import of SNCR system softened water tank 21.
The body of the washing tower 4 is made of organic glass Fiber Reinforced Plastic (FRP), and the corrosion resistance is strong. The bottom of the washing tower 4 is provided with a blow-down valve for periodic blow-down.
The fillers in the first-stage filler section 6 and the second-stage filler section 8 are plastic step ring fillers, the bottom of the filler layer is provided with a filler support plate, and the support plate is a grid plate type support plate. After the filler in the filler section is filled, the filler pressing grid plate is arranged above the filler section, so that the filler is prevented from loosening and jumping under the action of air flow.
Liquid distributors are arranged in the first-stage spraying section 7 and the second-stage spraying section 9, and the liquid distributors are calandria type sprayers which can provide enough even liquid distribution and leave enough large gas channels. The spraying liquid enters the calandria sprayer through the horizontal section of the spraying water pipe 16 and sprays to the packing layer through the small holes on the branch pipe.
The demisting plate 10 adopts a pall ring water blocking layer structure and is used for removing liquid drops in air flow at an air outlet and preventing ammonia gas from being dissolved in water to generate foam which is discharged along with the air flow and influence the efficiency of the washing tower for absorbing the ammonia gas.
The washing tower 4 is provided with a monitoring window and an inspection manhole so that a person can monitor whether the working condition of the washing tower is normal or not and timely replace the aged packing.
The centrifugal fan 12 is made of glass fiber reinforced plastic, and can convey air filtered by the washing tower to the exhaust air pipe 13. The centrifugal fan 12 can realize variable frequency operation and is connected into the DCS system.
The exhaust air pipe 13 is provided with a gas detector, and the exhausted gas meets the standard of ammonia gas emission in table 2 of 'emission standard of malodorous pollutants' GB 14554-1993.
The spray liquid of the washing tower 4 adopts demineralized water, the demineralized water comes from a water-melting workshop of a waste incineration plant, a liquid storage tank at the bottom of the washing tower is provided with a ball float valve, and the water replenishing function can be automatically realized according to the level of the demineralized water in the liquid storage tank.
The desalting water pump 17 is arranged near the washing tower 4, is made of stainless steel SUS304 and is used for conveying the ammonia-containing desalting water in the washing tower into the desalting water tank 19, and the desalting water pump 17 can be automatically started and stopped according to the liquid level in the desalting water tank 19.
The filter 18 has a filtering precision of 80 meshes and is used for filtering the desalted water conveyed by the desalted water pump 17.
The desalted water tank 19 is made of SUS304 and should be tightly sealed, the desalted water tank 19 is provided with an online water quality analysis instrument, if the desalted water quality is unqualified, the front section of the desalted water tank is cut off, and process equipment such as a washing tower, a desalted water pump and the like needs to be cleaned and maintained. The bottom of the desalting water tank is provided with a drain valve for draining periodically.
The transfer pump 20 and the SNCR system soft water tank 21 are also made of SUS 304. The bottom of the soft water tank 21 of the SNCR system is provided with a blow-down valve for periodic blow-down.
The DCS control system is connected with an ammonia gas detector, an ammonia gas alarm device, a washing tower 4, a circulating pump, a centrifugal fan 12, a demineralized water pump 17 and a transfer pump 20. The DSC control system can realize the unmanned automatic operation function of the whole set of system. The starting, stopping and fault alarming of the pump and the fan have remote monitoring and operation; the start, stop and fault alarm and current of the whole ammonia gas recovery equipment have DCS monitoring and operating functions; the water tank and the water pump are both provided with a high-low liquid level alarm and water pump interlocking input operation device, and parameters such as liquid level, flow and the like of the system are provided with a monitoring system, so that recording and continuous monitoring can be performed. In conclusion, the whole ammonia recovery processing system is ensured to continuously and reliably operate.
An ammonia recovery structure and an ammonia recovery method for a fly ash curing workshop comprise the following steps:
the principle of ammonia recovery is that ammonia is very soluble in water, the solubility of ammonia is 1:700, and ammonia reacts with water to generate ammonia monohydrate: NH (NH)3+H2O→NH3.H2O。
When an ammonia gas detector of the fly ash curing workshop 1 senses that ammonia gas exceeds a set value, a signal is sent to a DCS control system, the DCS control system enables an ammonia gas recovery device to operate, and ammonia-containing air in the fly ash curing workshop 1 is introduced into an air inlet at the bottom of a washing tower 4 through a collecting air pipe 2; the air containing ammonia passes through a first-stage filling section 6, a first-stage spraying section 7, a second-stage filling section 8 and a second-stage spraying section 9 from bottom to top in the washing tower, and the desalted water is uniformly sprayed into a filling layer of the filling section through liquid distributors in the first-stage spraying section 7 and the second-stage spraying section 9 and flows downwards along the surface of the filling layer; the ammonia-containing air is in countercurrent contact with the desalted water flowing down from the top of the washing tower, ammonia gas and desalted water are subjected to chemical reaction on the surface of the filler in the countercurrent contact process, the ammonia gas in the ammonia-containing air is completely dissolved in water under the action of the filler and falls into the liquid storage tank 5 of the washing tower along with the desalted water, countless fine fog drops are formed when the desalted water is sprayed out at high speed in the spraying section, and the fine fog drops are fully mixed and contacted with the ammonia gas to further absorb the ammonia gas; the purified air rises to the demisting plate 10 mechanically, the water mist in the air is removed by the demisting plate 10, and then the air is conveyed back to the fly ash curing workshop 1 through a centrifugal fan 12; the ammonia-containing demineralized water in the liquid storage tank 5 is pressurized by a circulating pump and then is conveyed to a spray pipe 16, and then is conveyed to a first-stage spray section 7 and a second-stage spray section 9 through the spray pipe 16, reacts with ammonia gas and then flows back to the liquid storage tank 5 for recycling; when the circularly used ammonia-containing demineralized water cannot achieve the designed treatment effect, the ammonia-containing demineralized water is conveyed to a demineralized water tank 19 through a demineralized water pump 17 and then conveyed into an SNCR system soft water tank 21 through a transfer pump 20; when the liquid level of the reservoir 5 is lowered to a design value, fresh demineralized water is replenished through the demineralized water inlet line 3.
The desalted water is adopted as ammonia gas spray water, if the ammonia-containing process water formed by absorbing ammonia gas by using general process water has too high hardness, calcium and magnesium ions in the prepared ammonia water solution are separated out to cause scaling and blockage of pipelines in the SNCR system.
And mixing the ammonia-containing desalted water with an ammonia water solution in an SNCR system, and diluting the ammonia water solution to the required concentration for flue gas denitration. The SNCR (selective non-catalytic reduction) method is to spray ammonia water into flue gas, and reduce the ammonia water and NOx into N2 and H2O through the reaction of the ammonia water and NOx in a high-temperature (900-1100 ℃) area, so as to achieve the purpose of removing NOx. The reaction principle is as follows:
4NH3+4NO+O2→ 4N2+6H2O
4NH3+2NO2+O2→ 3N2+6H2O。
in addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a flying dust maintenance workshop's ammonia retrieves structure, includes flying dust maintenance workshop and SNCR system softened water tank, its characterized in that: the device also comprises a collecting air pipe, a desalted water input pipeline, a washing tower, a liquid storage tank, a first-stage filling section, a first-stage spraying section, a second-stage filling section, a second-stage spraying section, a demisting plate, a washing tower outlet air pipe, a centrifugal fan, an exhaust air pipe, a circulating pump, a spray water pipe, a desalted water pump, a filter, a desalted water tank and a transfer pump; an ammonia gas detector is arranged in the fly ash curing workshop; a collecting air pipe is arranged at the top of the fly ash curing workshop and is connected with an air inlet at the bottom of the washing tower; the collecting air pipe is provided with an air exhaust port; a first-stage filling section, a first-stage spraying section, a second-stage filling section, a second-stage spraying section and a demisting plate are sequentially arranged in the washing tower from bottom to top; a liquid storage tank is arranged at the bottom of the washing tower, the liquid storage tank is connected with a spray water pipe through a circulating pump, and the spray water pipe is connected with the first-stage spray section and the second-stage spray section; the demineralized water input pipeline is connected with the liquid storage tank; an upper exhaust port of the washing tower is connected with an inlet of a centrifugal fan through an outlet air pipe of the washing tower, and an outlet of the centrifugal fan is connected with a fly ash curing workshop through an exhaust air pipe; the liquid reserve tank is connected with demineralized water pump inlet, and demineralized water pump export is connected with the filter access, and the filter export links to each other with demineralized water tank import, and demineralized water tank export links to each other with the transfer pump import, and the transfer pump export links to each other with the import of SNCR system softened water tank.
2. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: and a blow-down valve is arranged at the bottom of the washing tower.
3. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: the fillers in the first-stage filler section and the second-stage filler section are plastic stepped ring fillers.
4. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: and liquid distributors are arranged in the first-stage spraying section and the second-stage spraying section.
5. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: the defogging plate adopts a pall ring water blocking layer structure.
6. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: the scrubbing tower be provided with and monitor window and maintenance manhole.
7. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: and the exhaust air pipe is provided with an air detector.
8. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: the liquid storage tank at the bottom of the washing tower is provided with a ball float valve.
9. An ammonia gas recovery structure for a fly ash maintenance plant according to claim 1, wherein: still include DCS control system, DCS control system links to each other with ammonia detector, ammonia alarm device, scrubbing tower, circulating pump, centrifugal fan, demineralized water pump, transfer pump.
10. A method for recovering ammonia gas in a fly ash curing workshop is characterized by comprising the following steps: an ammonia gas recovery structure as defined in any one of claims 1 to 9, comprising the steps of:
when an ammonia gas detector of the fly ash curing workshop senses that ammonia gas exceeds a set value, ammonia-containing air in the fly ash curing workshop is introduced into an air inlet at the bottom of the washing tower through a collecting air pipe; the air containing ammonia passes through the first-stage filling section, the first-stage spraying section, the second-stage filling section and the second-stage spraying section from bottom to top in the washing tower, and the desalted water is uniformly sprayed into the filling layer of the filling section through the liquid distributors in the first-stage spraying section and the second-stage spraying section and flows downwards along the surface of the filling layer; the air containing ammonia is in countercurrent contact with desalted water, and in the process of countercurrent contact, ammonia in the air containing ammonia is completely dissolved in water under the action of a filler and falls into a liquid storage tank of the washing tower along with the desalted water; the purified air rises to a demisting plate to remove water mist, and then is conveyed back to a fly ash curing workshop through a centrifugal fan; the ammonia-containing desalted water in the liquid storage tank is pressurized by a circulating pump and then conveyed to a spray pipe, and then conveyed to a first-stage spray section and a second-stage spray section through the spray pipe, and is reacted with ammonia gas and then reflows to the liquid storage tank for recycling; when the circularly used ammonia-containing demineralized water cannot achieve the designed treatment effect, the ammonia-containing demineralized water is conveyed to a demineralized water tank through a demineralized water pump and then conveyed to a soft water tank of an SNCR (selective non catalytic reduction) system through a transfer pump; when the liquid level of the reservoir tank is lowered to a design value, fresh demineralized water is replenished through the demineralized water inlet line.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113952814A (en) * | 2021-11-29 | 2022-01-21 | 唐县冀东水泥有限责任公司 | Deamination tower for preventing ammonia from escaping |
| CN114588753A (en) * | 2022-03-31 | 2022-06-07 | 中化(浙江)膜产业发展有限公司 | Device and method for treating ammonia-containing waste gas of fly ash washing system |
| CN115178081A (en) * | 2022-08-15 | 2022-10-14 | 安徽东至广信农化有限公司 | Ammonia water recycling process suitable for SNCR (selective non-catalytic reduction) process |
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