CN113230829B - Device and method for recovering ammonia-containing tail gas in sodium carbonate production and filtration process - Google Patents
Device and method for recovering ammonia-containing tail gas in sodium carbonate production and filtration process Download PDFInfo
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- CN113230829B CN113230829B CN202110390166.9A CN202110390166A CN113230829B CN 113230829 B CN113230829 B CN 113230829B CN 202110390166 A CN202110390166 A CN 202110390166A CN 113230829 B CN113230829 B CN 113230829B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/001—Filters in combination with devices for the removal of gas, air purge systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/1412—Controlling the absorption process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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Abstract
The invention discloses a recovery device and a method for ammonia-containing tail gas in a filtering process of soda production, which adopt a multi-stage covering type recovery device for ammonia-containing tail gas and a three-stage gradient full-covering type recovery method, utilize the cooperation of a recovery cover cap and a recovery cover plate to reduce the escape space of the ammonia-containing tail gas, layer the escape space, utilize a vacuumizing device to cause a bottom layer negative pressure environment, add a clean ammonia washing water spraying device to enhance the recovery effect, and the recovered clean ammonia washing water can also be used as secondary washing water of a belt filter for reuse without additional production of pollutants; the invention uses a vacuum and spray absorption method to treat the ammonia-containing tail gas dissipated on site, thereby improving the utilization efficiency of the raw material ammonia, improving the atmosphere and the production site environment.
Description
Technical Field
The invention belongs to the technical field of harmful tail gas recovery treatment in the soda ash industry, and particularly relates to a device and a method for recovering ammonia-containing tail gas in a soda ash production filtering process.
Background
Ammonia is a gas with strong pungent smell, the unorganized emission of ammonia in production seriously affects the field environment and the physical and mental health of operators, and meanwhile, the volatilization of ammonia increases the consumption of raw materials in the production process and increases the production cost; therefore, the treatment work for ammonia dissipation should be strengthened from the human living environment and the enterprise benefit.
In the soda industry, a belt filter is generally used for producing soda intermediate product heavy soda in a filtering process, and compared with a strand filter, the belt filter has the main performances of large monomer equipment capacity, low energy consumption and low washing water equivalent; therefore, the belt filter is the preferred equipment for the soda production process.
The belt filter adopts a centrifugal compressor to generate vacuum negative pressure, the vacuum negative pressure is used as extrusion force to realize solid-liquid separation, and the solid is filtered out from the mother liquor through filter cloth to form a filter cake, namely the heavy alkali; when the centrifugal compressor of the prior belt filter is vacuumized to perform solid-liquid separation, part of ammonia-containing tail gas is pumped and connected with an ammonia purifier for filtering the tail gas through a pipeline to perform an ammonia treatment process, and meanwhile, a centrifugal blower is used above the belt filter to pump the ammonia-containing tail gas on a filter cake, and the ammonia-containing tail gas enters an ammonia washing tower for washing to perform the ammonia treatment process.
In the current actual production process, the field ammonia smell is heavier, the working environment is severe, in order to improve the field environment, a worker optimizes the existing non-totally-closed plastic cover body to be close to a totally-closed plastic cover body and reduces the cover body, the distance between the air inducing pipe orifice of the centrifugal blower and the surface of a filter cake is reduced from 120cm to 50cm, free gaseous ammonia attached to the surface of heavy alkali still exists on the field and volatilizes and is dissipated to the production field, the field environment still has severe irritant ammonia, and the field measurement concentration is about 60ppm (originally 100 ppm); indicating that the use of the method alone is insufficient to solve the problem by merely sealing the cover and reducing the height of the cover; and the volatilization of ammonia tail gas leads to the recovery and low utilization rate of raw material ammonia, so an ammonia tail gas recovery measure which has stronger absorption capacity to ammonia tail gas and does not increase the cost as much as possible is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for recovering ammonia-containing tail gas in the filtering process of soda production, which adopt a full-coverage multi-stage recovery method and a vacuum spraying absorption method to treat the ammonia-containing tail gas escaped on site, improve the utilization efficiency of raw material ammonia, improve the atmosphere and improve the environment of the production site.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a recovery device of ammonia-containing tail gas in the filtering process of soda production is arranged above a belt filter and further comprises,
the recovery cover plate is covered above a filter cake of the belt filter; the middle part of the recovery cover plate along the filter cake conveying direction of the belt filter is provided with a ridge-shaped bulge part; a plurality of first pumping holes are uniformly formed in the recovery cover plate, and the first pumping holes are hermetically connected with a vacuum air pipe of a vacuumizing device;
the recovery cover cap is internally provided with a cavity, and the bottom of the recovery cover cap is opened; the recycling cover covers the periphery of the belt filter; a channel for conveying filter cakes is arranged between the inner wall of the recovery cover cap and the belt of the belt filter, and the inner wall of the recovery cover cap, the belt of the belt filter and the filter cakes form a closed space; the recovery cover plate is fixed inside the recovery cover cap; the top of the recovery cover cap is provided with a second pumping hole, and the second pumping hole is hermetically connected with an exhaust pipe of the centrifugal blower;
the surface of the recovery cover is provided with a plurality of water pipe interfaces, a purified ammonia washing water pipe is connected into the recovery cover in a sealing way through the water pipe interfaces, and a water outlet of the purified ammonia washing water pipe extends into the recovery cover and sprays purified ammonia washing water above the recovery cover plate; retrieve the apron and be V type rake along belt filter's filter cake direction of transportation's both sides, the drainage hole has been seted up to the bottom of V type rake, the drainage hole with be provided with two wash basins between the filter cake, it is used for retrieving clean ammonia wash water is as two wash water of filter cake.
Furthermore, an online ammonia gas detector is arranged at one end of the exhaust pipe close to the second exhaust hole; and a self-regulating valve is arranged on the ammonia purification washing water pipe and is associated with the online ammonia detector through a DCS (distributed control system).
Further, the vacuum pumping device is a centrifugal compressor for realizing solid-liquid separation in the filtering process, and the centrifugal compressor is connected with an ammonia treatment device.
Furthermore, the top of the recovery cover cap is provided with a ridge-shaped bulge in the middle along the conveying direction of the filter cake of the belt filter.
A recovery method of ammonia-containing tail gas in the process of producing and filtering soda ash, further, adopting a three-layer step-by-step recovery method to recover ammonia-containing tail gas formed by volatilization of free gaseous ammonia attached to the surface of a filter cake, comprises the following steps:
s1, primary recovery; forming a negative pressure space between the recovery cover plate and a filter cake of the belt filter by a vacuumizing device, continuously pumping the escaped ammonia-containing tail gas, and leading the pumped ammonia-containing tail gas into an ammonia treatment process;
s2, secondary recovery: spraying clean ammonia washing water above the recovery cover plate, and absorbing part of ammonia-containing tail gas escaping to the upper part of the recovery cover plate in the step S1; the sprayed clean ammonia washing water falls into a V-shaped rake angle of the recovery cover plate, enters a secondary washing water tank as secondary washing water of a filter cake, and finally converges into the washing liquid of the belt filter and enters a washing liquid separator together;
s3, three-stage recovery: and (4) pumping and recovering the escaped ammonia-containing tail gas in the inner cavity of the cover cap by using a centrifugal blower, pumping the escaped ammonia-containing tail gas recovered in the step (S1) and the step (S2) through an air pumping pipe, and entering an ammonia treatment process.
Further, in step S1, the pressure between the recovery cover plate and the filter cake of the belt filter is less than or equal to-3 Kpa; in step S3, the pressure at the second suction hole of the suction pipe is less than or equal to-3 Kpa.
Further, the pipeline opening of the exhaust pipe is measured on line through an online ammonia gas detector, and when the measured value is larger than or equal to 5ppm, a DCS control system controls a self-regulating valve on the ammonia-purifying washing water pipe to increase the opening degree and increase the spraying amount of the ammonia-purifying washing water; and when the detection value of the online ammonia gas detector is less than 5ppm, maintaining the flow of the clean ammonia washing water in the current state.
Has the advantages that:
firstly, by implementing the scheme, a multistage covering type ammonia-containing tail gas recovery device is used, a recovery cover cap is matched with a recovery cover plate, the ammonia-containing tail gas escape space is reduced, the escape space is layered, a vacuumizing device is used for generating a bottom layer negative pressure environment, most of ammonia-containing tail gas is pumped away, the escape amount is greatly reduced, and the recovery cover plate with a ridge-shaped return angle is adopted, so that the effective contact area of recovery is increased, and the recovery efficiency is improved; a clean ammonia washing water spraying device is added to enhance the recovery effect, and the recovered clean ammonia washing water can be reused as secondary washing water of the belt filter without additional pollutants; according to actual field test, the ammonia concentration in the environment around the belt filter is reduced from 30ppm to 0ppm; the average ammonia concentration in the space above the belt filter is reduced from 100ppm to 5ppm; the recovery and the utilization of the ammonia are 6.07t/a.
And secondly, the vacuumizing device of the ammonia-containing tail gas recovery device is a centrifugal compressor for realizing solid-liquid separation in the filtering process, and the centrifugal blower is an original device for pumping the ammonia-containing tail gas, so that the device utilizes original equipment, other large-scale equipment is not added, the production site is slightly changed, and the equipment cost is hardly increased.
Thirdly, a recovery method of ammonia-containing tail gas aims at controlling the escape space of the ammonia-containing tail gas and simultaneously adopting a vacuumizing device with stronger vacuumizing force to pump, and utilizing the good solubility of the low-concentration ammonia-containing tail gas in water to recover by adopting a three-level gradient full-coverage mode; the first stage adopts negative pressure targeted recovery in a small-volume environment, the pumped ammonia-containing tail gas enters an ammonia treatment process, the second stage adopts a very small part of the ammonia-containing tail gas which escapes by spraying, and the spraying liquid is used as second washing water of the belt filter; the belt filter is integrally covered in an inclusion manner by adopting a ridge type recovery cover cap in the third stage, so that the effective extraction amount is controlled, the efficiency of extracting and recovering ammonia-containing tail gas is enhanced, and the extracted gas enters an ammonia washing tower to be subjected to an ammonia treatment process.
Fourthly, increasing the pipe orifice of the exhaust pipe, and realizing the pipeline orifice through an online ammonia gas detector and a self-regulating valve on a clean ammonia washing water pipe through a DCS (distributed control system), wherein the spraying amount of the clean ammonia washing water is automatically regulated according to the ammonia concentration in the ammonia-containing tail gas, so that the efficiency is improved, and no waste of the clean ammonia washing water is generated; because the primary function of the original vacuumizing device is extrusion force for solid-liquid separation of the intermediate product heavy alkali, the surplus capacity is fully used for recovering the tail gas containing ammonia under the condition of ensuring the realization of the original function.
Drawings
FIG. 1 is a schematic view of a perspective view of the apparatus of the present invention;
FIG. 2 is a schematic diagram of a perspective view of the internal structure of the apparatus of the present invention;
FIG. 3 is a schematic diagram showing the structure of a filtration process for soda production;
description of the symbols:
1. the device comprises a recovery cover cap, 2 parts of a clean ammonia washing water pipe, 2 parts to 1 parts of a spray header, 3 parts of a recovery cover plate, 3 parts to 1 parts of a first pumping hole, 4 parts of filter cloth, 5 parts of a belt filter, 5 parts to 1 parts of a belt, 6 parts of a filter cake, 7 parts to 1 parts of a vacuum branch pipe, 7 parts to 2 parts of a vacuum main gas pipe, 8 parts of a secondary washing tank, 9 parts of a drainage pipe, 10 parts of an exhaust pipe, 11 parts of washing liquid of the belt filter, 12 parts of a washing liquid separator, 13 parts of clean ammonia washing water, 14 parts of a centrifugal blower, 15 parts of mother liquid, 16 parts of an ammonia washing tower, 17 parts of a self-regulating valve and 18 parts of an online ammonia detector.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
As shown in fig. 1-3, the recovery device for ammonia-containing tail gas in the filtering process of soda production is arranged above a belt filter 5 and comprises a recovery cover plate 3 and a recovery cover cap 1; wherein, the recovery cover plate 3 covers the filter cake 6 of the belt filter, preferably, the recovery cover plate 3 is made of plastic material; the middle part of the recovery cover plate 3 along the transportation direction of the filter cake 6 of the belt filter is provided with a ridge-shaped bulge, preferably, the gradient of the ridge-shaped bulge is 2.5 percent, which increases the effective contact area of the recovery of the tail gas containing ammonia; a plurality of first drawing holes 3-1 are uniformly formed in the recovery cover plate 3, the density of the holes is 1 per square meter, and the aperture is 25cm; the first extraction holes 3-1 are hermetically connected with a vacuum air pipe of the vacuum-pumping device, preferably, each first extraction hole 3-1 is respectively connected with a vacuum branch pipe 7-1; all the vacuum branch pipes 7-1 are connected to a vacuum main gas pipe 7-2 in a gathering manner, the vacuum main gas pipe 7-2 is connected with a centrifugal compressor (not shown in the figure) for realizing solid-liquid separation in a filtering process, the centrifugal compressor is connected with an ammonia treatment device (not shown in the figure), a vacuumizing device is used for generating a bottom layer negative pressure environment, most of tail gas containing ammonia is pumped away, the dissipation amount is greatly reduced, the cost is not increased by using the existing equipment, and the field layout is not influenced.
The recovery cover cap 1 is internally provided with a cavity, and the bottom of the recovery cover cap is opened; the recovery cover cap 1 covers the periphery of the belt filter 5, preferably, the top of the recovery cover cap 1 is provided with a ridge-shaped bulge in the middle along the conveying direction of a filter cake 6 of the belt filter; a channel for conveying the filter cake 6 is arranged between the inner wall of the recovery cover cap 1 and the belt 5 of the belt filter, and the inner wall of the recovery cover cap 1, the belt 5 of the belt filter and the filter cake 6 form a closed space, so that the free gaseous ammonia dissipation space is reduced; the recovery cover plate 3 is arranged inside the recovery cover cap 1, and the dissipation space of the ammonia-containing tail gas is layered by utilizing the recovery cover plate 3, so that grading recovery is facilitated; a second pumping hole is formed above the recovery cover cap 1, the second pumping hole is hermetically connected with a pumping pipe 10 of the centrifugal blower, and gas is pumped to an existing ammonia washing tower 16 to carry out an ammonia treatment process.
The surface of the recovery cover cap 1 is provided with a plurality of water pipe interfaces, the water pipe interfaces are connected with a clean ammonia washing water pipe 2 in a sealing way, the water outlet of the clean ammonia washing water pipe 2 extends into the recovery cover cap, and preferably, a spray head 2-1 is arranged on the water outlet of the clean ammonia washing water pipe and sprays clean ammonia washing water above the recovery cover plate 3; retrieve apron 3 and be V type rake along the both sides of 6 direction of transportation of filter cake of belt filter, the drainage hole has been seted up in the bottom of V type rake, and drainage hole seal mounting has the one end of drainage tube 9, and the other end of drainage tube 9 stretches into two wash basins 8, the clean ammonia wash water of retrieving can regard as two wash water reuse of belt filter, and it flows to wash away the sodium chloride on the filter cake 6 above the filter cake from two wash basins 8, does not have extra production pollutant.
An online ammonia gas detector 18 is arranged at one end of the exhaust tube 10 close to the second exhaust hole; the water pipe 2 for washing the purified ammonia is provided with a self-regulating valve 17 which is connected with an online ammonia detector 18 through a DCS control system.
The utility model provides a recovery method of including ammonia tail gas in soda production filtration process, its recovery unit who uses including ammonia tail gas in soda production filtration process adopts the three-layer to retrieve the method step by step, retrieves the volatile ammonia tail gas that contains that forms of free gaseous ammonia that 6 surfaces of filter cake are adhered to, includes:
s1, primary recovery; a negative pressure space is formed between the recovery cover plate 3 and the filter cake 6 of the belt filter by a vacuum pumping device, and the pressure between the recovery cover plate 3 and the filter cake 6 of the belt filter is less than or equal to-3 Kpa; the single air volume of the vacuumizing device is 1,000Nm/h, the escaped ammonia-containing tail gas is continuously pumped, and the pumped ammonia-containing tail gas enters an ammonia treatment process;
s2, secondary recovery: spraying clean ammonia washing water 13 above the recovery cover plate 3, wherein the maximum flow of the sprayed clean ammonia washing water 13 is single 2 m/h, and absorbing part of ammonia-containing tail gas escaping from the step S1 to the position above the recovery cover plate 3 by utilizing the good solubility of low-concentration ammonia-containing tail gas in water; the sprayed clean ammonia washing water 13 falls into a V-shaped rake angle of the recovery cover plate 3, enters a secondary washing water tank 8 through a drainage tube 9, is used as secondary washing water of a filter cake 6, and finally is collected into a belt filter, and washing liquid 11 and washing liquid 12 enter a washing liquid separator together;
s3, three-stage recovery: and (3) pumping the escaped ammonia-containing tail gas in the inner cavity of the recovery cover cap 1 by using a centrifugal blower 14, sharing one centrifugal blower 14 by four belt filters, pumping the escaped ammonia-containing tail gas recovered by the step S1 and the step S2 through a pumping pipe 10, wherein the air volume of the centrifugal blower 14 is 20000 Nm/h, the static pressure is 408mmHg, the rotating speed is 2070r/min, the pressure at a second pumping hole of the pumping pipe 10 is less than or equal to-3 Kpa, and the escaped ammonia-containing tail gas recovered by the step S1 and the step S2 enters an ammonia gas washing tower 16 and enters an ammonia treatment process.
Preferably, in an initial state, the self-regulating valve 17 of the purified ammonia washing water pipe 2 is in a middle position, the pipe port of the exhaust pipe 10 is measured on line by an online ammonia gas detector 18, and preferably, the online ammonia gas detector 18 is a tubular online ammonia gas detector producing MIC-500S-NH3 by Shenzhen Yiyunnan electronics Limited; when the measured value is more than or equal to 5ppm, the DCS control system controls the self-regulating valve 17 on the clean ammonia washing water pipe 2 to increase the opening degree and increase the spraying amount of the clean ammonia washing water 13; when the detection value of the online ammonia gas detector 18 is less than 5ppm, the flow of the clean ammonia washing water 13 in the current state is maintained, and the spraying amount of the clean ammonia washing water 13 is automatically adjusted according to the ammonia-containing concentration in the ammonia-containing tail gas, so that the efficiency is improved, and no waste of the clean ammonia washing water is caused; because the primary function of the original vacuum extractor is the extrusion force for solid-liquid separation of the intermediate product heavy alkali, the surplus capacity is fully used in the recovery of tail gas containing ammonia under the condition of ensuring the realization of the original function.
The above-mentioned embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention, and any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention; accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. A recovery device for ammonia-containing tail gas in the filtration process of soda production is arranged above a belt filter and is characterized by comprising,
the recovery cover plate is covered above the filter cake of the belt filter; the middle part of the recovery cover plate along the filter cake conveying direction of the belt filter is provided with a ridge-shaped bulge part; a plurality of first pumping holes are uniformly formed in the recovery cover plate, and the first pumping holes are hermetically connected with a vacuum air pipe of a vacuumizing device;
the recovery cover cap is internally provided with a cavity, and the bottom of the recovery cover cap is opened; the recovery cover covers the periphery of the belt filter; a channel for conveying filter cakes is arranged between the inner wall of the recovery cover cap and the belt of the belt filter, and the inner wall of the recovery cover cap, the belt of the belt filter and the filter cakes form a closed space; the recovery cover plate is fixed inside the recovery cover cap; the top of the recovery cover cap is provided with a second pumping hole, and the second pumping hole is hermetically connected with an exhaust pipe of the centrifugal blower;
the surface of the recovery cover is provided with a plurality of water pipe interfaces, a purified ammonia washing water pipe is connected into the recovery cover in a sealing way through the water pipe interfaces, and a water outlet of the purified ammonia washing water pipe extends into the recovery cover and sprays purified ammonia washing water above the recovery cover plate; the two sides of the recovery cover plate along the filter cake conveying direction of the belt filter are V-shaped warped angles, the bottom of each V-shaped warped angle is provided with a drainage hole, and two washing water tanks are arranged between the drainage holes and the filter cake and used for recovering the clean ammonia washing water as the two washing water of the filter cake; an online ammonia gas detector is arranged at one end of the exhaust pipe close to the second extraction hole; and a self-regulating valve is arranged on the ammonia purification washing water pipe and is associated with the online ammonia detector through a DCS (distributed control system).
2. The apparatus for recovering ammonia-containing tail gas from the filtration process of soda production according to claim 1, wherein the vacuum extractor is a centrifugal compressor for realizing solid-liquid separation in the filtration process, and the centrifugal compressor is connected to an ammonia treatment apparatus.
3. The apparatus for recovering tail gas containing ammonia from the soda production filtration process according to claim 1, wherein a ridge-like projection is provided at a central portion of a top of the recovery hood along a transportation direction of a cake of the belt filter.
4. The utility model provides a recovery method of ammonia-containing tail gas in soda production filtration process, which is characterized in that adopts three-layer recovery method step by step, retrieves the ammonia-containing tail gas that the attached free gaseous ammonia of filter cake surface volatilizees and forms, includes:
s1, primary recovery; forming a negative pressure space between the recovery cover plate and a filter cake of the belt filter by a vacuumizing device, continuously pumping the escaped ammonia-containing tail gas, and leading the pumped ammonia-containing tail gas into an ammonia treatment process;
s2, secondary recovery: spraying clean ammonia washing water above the recovery cover plate, and absorbing part of ammonia-containing tail gas escaping to the upper part of the recovery cover plate in the step S1; the sprayed clean ammonia washing water falls into a V-shaped rake angle of the recovery cover plate, enters a secondary washing water tank as secondary washing water of a filter cake, and finally converges into the washing liquid of the belt filter and enters a washing liquid separator together;
s3, three-stage recovery: and (4) pumping and recovering the escaped ammonia-containing tail gas in the inner cavity of the cover cap by using a centrifugal blower, pumping the escaped ammonia-containing tail gas recovered in the step (S1) and the step (S2) through an air pumping pipe, and entering an ammonia treatment process.
5. The method for recovering tail gas containing ammonia in the soda production and filtration process according to claim 4, wherein in step S1, the pressure between the recovery cover plate and the filter cake of the belt filter is less than or equal to-3 Kpa; in step S3, the pressure at the second suction hole of the suction pipe is less than or equal to-3 Kpa.
6. The method for recovering ammonia-containing tail gas in the soda production and filtration process according to claim 4, wherein the pipe orifice of the air extraction pipe is measured on line by an on-line ammonia gas detector, and when the measured value is not less than 5ppm, a DCS control system controls a self-regulating valve on the ammonia purification washing water pipe to increase the opening degree and increase the spraying amount of the ammonia purification washing water; and when the detection value of the online ammonia gas detector is less than 5ppm, maintaining the flow of the clean ammonia washing water in the current state.
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| CN202110390166.9A CN113230829B (en) | 2021-04-12 | 2021-04-12 | Device and method for recovering ammonia-containing tail gas in sodium carbonate production and filtration process |
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| CN202110390166.9A CN113230829B (en) | 2021-04-12 | 2021-04-12 | Device and method for recovering ammonia-containing tail gas in sodium carbonate production and filtration process |
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| CN1830515A (en) * | 2006-02-13 | 2006-09-13 | 新乡中新化工有限责任公司 | Filter for separating sodium bicarbonate and mother liquor in sodium carbonate production |
| EP2119489A1 (en) * | 2008-05-14 | 2009-11-18 | Uhde Fertilizer Technology B.V. | Method for reducing aerosol emissions in a urea granulation plant |
| CN103638732B (en) * | 2013-12-16 | 2015-03-11 | 丹东东方机电工程有限公司 | Band type drum filter |
| CN107684771A (en) * | 2017-10-24 | 2018-02-13 | 核工业烟台同兴实业有限公司 | A kind of belt vacuum filter with air cushion |
| CN209092845U (en) * | 2018-08-10 | 2019-07-12 | 卜正国 | A kind of dehydration device of ammonium sulfate |
| CN215138416U (en) * | 2021-04-12 | 2021-12-14 | 实联化工(江苏)有限公司 | Recovery unit who contains ammonia tail gas in soda production filtration process |
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