CN112807924A - Phosphorus ammonia tail gas clean-up system - Google Patents
Phosphorus ammonia tail gas clean-up system Download PDFInfo
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- CN112807924A CN112807924A CN202110172115.9A CN202110172115A CN112807924A CN 112807924 A CN112807924 A CN 112807924A CN 202110172115 A CN202110172115 A CN 202110172115A CN 112807924 A CN112807924 A CN 112807924A
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- tail gas
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- YFYIWIZSIVZILB-UHFFFAOYSA-N N.[P] Chemical compound N.[P] YFYIWIZSIVZILB-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000005406 washing Methods 0.000 claims abstract description 221
- 238000010521 absorption reaction Methods 0.000 claims abstract description 51
- 238000000746 purification Methods 0.000 claims abstract description 34
- 238000000605 extraction Methods 0.000 claims abstract description 11
- 238000005469 granulation Methods 0.000 claims abstract description 8
- 230000003179 granulation Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 182
- 239000007788 liquid Substances 0.000 claims description 153
- 239000002699 waste material Substances 0.000 claims description 83
- 238000004140 cleaning Methods 0.000 claims description 40
- 239000007921 spray Substances 0.000 claims description 37
- 238000005201 scrubbing Methods 0.000 claims description 19
- 238000001914 filtration Methods 0.000 claims description 15
- 230000000712 assembly Effects 0.000 claims description 12
- 238000000429 assembly Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 12
- 239000002912 waste gas Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 18
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 239000004254 Ammonium phosphate Substances 0.000 description 3
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 3
- 235000019289 ammonium phosphates Nutrition 0.000 description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- RGCLLPNLLBQHPF-HJWRWDBZSA-N phosphamidon Chemical compound CCN(CC)C(=O)C(\Cl)=C(/C)OP(=O)(OC)OC RGCLLPNLLBQHPF-HJWRWDBZSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- LDDQLRUQCUTJBB-UHFFFAOYSA-N ammonium fluoride Chemical class [NH4+].[F-] LDDQLRUQCUTJBB-UHFFFAOYSA-N 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
-
- 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
- B01D53/1406—Multiple stage absorption
-
- 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
- B01D53/1425—Regeneration of liquid absorbents
-
- 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
- B01D53/1431—Pretreatment by other processes
- B01D53/145—Pretreatment by separation of solid or liquid material
-
- 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
- B01D53/1456—Removing acid components
-
- 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
-
- 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
- B01D53/185—Liquid distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Treating Waste Gases (AREA)
Abstract
The application discloses phosphorus ammonia tail gas clean-up system belongs to tail gas clean-up technical field, can solve the relatively poor problem of current phosphorus ammonia tail gas clean-up system purifying effect. The phosphorus ammonia tail gas purification system comprises a cyclone washing tower, a first washing tower, a defoaming tower, an absorption tower and a second washing tower; a gas inlet of the cyclone washing tower is used for inputting extraction tail gas, and a gas outlet is communicated with a first gas inlet of the first washing tower; the gas output port of the first washing tower is communicated with the gas input port of the defoaming tower; the gas output port of the defoaming tower is communicated with the gas input port of the absorption tower; the gas output port of the absorption tower is communicated with the third gas input port of the second washing tower; and a fourth gas input port of the second washing tower is used for inputting granulation tail gas, and a gas output port is communicated with a chimney. This application can make exhaust purification tail gas reach present exhaust emission standard.
Description
Technical Field
The application relates to the technical field of tail gas purification, in particular to a phosphorus ammonia tail gas purification system.
Background
In the phosphorus ammonia production, can produce a large amount of tail gases on the production line, mainly contain material such as dust, ammonia, phosphoric acid, flue gas in the tail gas, the direct atmosphere that discharges of tail gas of production can cause the pollution of environment to tail gas can only externally discharge after purifying usually. With the increasing requirements of the exhaust emission standard, the phosphorus ammonia production device is under greater and greater environmental protection pressure.
Most of the existing phosphorus ammonia tail gas purification adopts a mode of combining bag dust removal purification or dry and wet dust removal purification, but the purification effect is poor, and the existing tail gas emission standard cannot be reached.
Disclosure of Invention
The embodiment of the application can solve the problem of poor purification effect of the existing phosphorus ammonia tail gas purification system by providing the phosphorus ammonia tail gas purification system.
The embodiment of the invention provides a phosphorus ammonia tail gas purification system, which comprises a cyclone washing tower, a first washing tower, a defoaming tower, an absorption tower and a second washing tower, wherein the cyclone washing tower is connected with the first washing tower; a gas input port of the cyclone washing tower is used for inputting extraction tail gas, and a gas output port is communicated with a first gas input port of the first washing tower; the gas output port of the first washing tower is communicated with the gas input port of the defoaming tower; the gas output port of the defoaming tower is communicated with the gas input port of the absorption tower; the gas output port of the absorption tower is communicated with the third gas input port of the second washing tower; and a fourth gas input port of the second washing tower is used for inputting granulation tail gas, and a gas output port is communicated with a chimney.
In a possible implementation manner, the first washing tower and the second washing tower both comprise a multi-layer spray washing structure, or the first washing tower or the second washing tower comprises a multi-layer spray washing structure; the multiple layers of spraying and washing structures are axially arranged in the tower at intervals and can spray washing liquid to the tower bottom; the first gas input port, the third gas input port and the fourth gas input port are arranged on the tower wall between the spray washing structure at the bottommost layer and the tower bottom.
In one possible implementation, the spray scrubbing structure includes a pipe and a plurality of spray headers; one end of the pipeline is positioned in the tower and is in a spiral shape, and a plurality of spray headers are arranged at intervals; the other end of the pipeline is positioned outside the tower and is used for introducing washing liquid; the plurality of spray headers are used for spraying the washing liquid to the tower bottom.
In a possible implementation manner, the first washing tower further comprises a second gas input port, and the second gas input port is arranged on the tower wall between the spray washing structure at the bottommost layer and the tower bottom and is used for inputting other overproof waste gas.
In one possible implementation, the first washing tower and the second washing tower further each include a first demister and a first demister cleaning structure; or the first washing tower or the second washing tower further comprises a first demister and a first demister cleaning structure; the first demister is arranged in the tower and is positioned between the spraying and washing structure at the topmost layer and the tower top; the first demister cleaning structure is arranged in the tower and is positioned between the first demister and the top of the tower.
In one possible implementation, the first scrubber tower comprises a first waste liquid outlet arranged at the bottom of the tower, and the cyclone scrubber tower comprises a first scrubbing liquid inlet; the first waste liquid outlet is communicated with the first washing liquid inlet; and/or the second washing tower comprises a second waste liquid outlet arranged at the bottom of the tower, and the absorption tower comprises a second washing liquid inlet; the second waste liquid outlet is communicated with the second washing liquid inlet.
In a possible implementation, a filtering structure is respectively arranged between the first waste liquid outlet and the first washing liquid inlet, and between the second waste liquid outlet and the second washing liquid inlet.
In one possible implementation manner, the filtering structure includes a plurality of filtering components, and the plurality of filtering components are arranged in parallel.
In one possible implementation, the phosphorus ammonia tail gas purification system comprises a plurality of absorption towers; and the gas input ports of the absorption towers are communicated with the gas output port of the defoaming tower, and the gas output ports of the absorption towers are communicated with the third gas input port of the second washing tower.
In one possible implementation, the demister tower comprises a second demister and a second demister cleaning structure; the second demister is arranged in the tower and is positioned between the demister of the defoaming tower and the top of the tower; the second demister cleaning structure is arranged in the tower and is positioned between the second demister and the top of the tower.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
according to the phosphorus-ammonia tail gas purification system provided by the embodiment of the invention, the extracted tail gas is input from the gas input port of the cyclone washing tower, the extracted tail gas is washed and purified for multiple times through the cyclone washing tower, the first washing tower, the defoaming tower, the absorption tower and the second washing tower, the granulated tail gas is washed and purified through the second washing tower, the tail gas with a good purification effect is finally obtained, the purified tail gas is output from the gas output port of the second washing tower to a chimney to be discharged, and the discharged purified tail gas can reach the current tail gas emission standard.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a system for purifying phosphorus-ammonia tail gas provided in an embodiment of the present application.
Icon: 1-extracting the tail gas; 2-other over-standard waste gases; 3-a cyclone washing tower; 31-a first wash liquid inlet; 32-a first waste tank; 33-a third waste liquid outlet; 34-a vertical pipe; 35-a spray head; 36-gear disc; 37-a third demister; 38-a third demister cleaning structure; 4-a first scrubber; 41-a first gas input port; 42-a second gas entry port; 43-spray washing structure; 431-line; 432-a showerhead; 44-a first waste outlet; 45-a second waste tank; 5-a defoaming tower; 51-a second demister; 52-a second demister cleaning structure; 53-a demister; 6-an absorption tower; 61-a second wash liquid inlet; 62-a filler; 63-a washing mechanism; 64-a fourth demister; 65-a fourth demister cleaning structure; 7-a second scrubber; 71-a third gas entry port; 72-a fourth gas input port; 73-a first demister; 74-a first demister cleaning structure; 75-a second waste outlet; 76-third waste liquid tank; 8-a chimney; 9-a filter structure; 91-a filter assembly; 911-a filter; 912-a valve; 10-granulation tail gas; 11-a tail gas fan; 12-liquid storage pool.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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 embodiments of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
As shown in fig. 1, an embodiment of the present invention provides a phosphorus ammonia tail gas purification system, which includes a cyclone scrubber 3, a first scrubber 4, a defoaming tower 5, an absorption tower 6, and a second scrubber 7. The gas inlet of the cyclone scrubber 3 is used for inputting the extraction tail gas 1, and the gas outlet is communicated with the first gas inlet 41 of the first scrubber 4. The gas outlet of the first scrubber 4 is in communication with the gas inlet of the demister tower 5. The gas output port of the defoaming tower 5 is communicated with the gas input port of the absorption tower 6. The gas outlet of the absorption column 6 communicates with the third gas inlet 71 of the second scrubber 7. The fourth gas inlet 72 of the second scrubber 7 is used for inputting the granulation tail gas 10, and the gas outlet is communicated with the chimney 8.
According to the phosphorus-ammonia tail gas purification system provided by the embodiment of the invention, the extraction tail gas 1 is input from the gas input port of the cyclone washing tower 3, the extraction tail gas 1 is washed and purified for multiple times through the cyclone washing tower 3, the first washing tower 4, the defoaming tower 5, the absorption tower 6 and the second washing tower 7, the granulation tail gas 10 is washed and purified through the second washing tower 7, the tail gas with a good purification effect is finally obtained, the purified tail gas is output from the gas output port of the second washing tower 7 to the chimney 8 to be discharged, and the discharged purified tail gas can reach the current tail gas emission standard.
In practical application, as shown in fig. 1, the bottom of the cyclone scrubber 3 is a first waste liquid tank 32, and the bottom of the first waste liquid tank 32 is provided with a third waste liquid outlet 33. A gas inlet is arranged on the side wall of the cyclone washing tower 3. A standpipe 34 is provided in the cyclone tower 3, the standpipe 34 being in communication with the first scrubbing liquid inlet 31, the length of the standpipe 34 extending axially of the cyclone tower 3. The vertical pipes 34 are provided with spray nozzles 35 in an array along the length direction, and the top ends of the vertical pipes 34 are provided with baffle discs 36. A third demister 37 and a third demister cleaning structure 38 are also provided in the cyclone washing tower 3. A third demister 37 is disposed between the baffle disc 36 and the tower top, and a third demister cleaning structure 38 is disposed between the third demister 37 and the tower top. The top of the tower is a gas outlet of the cyclone washing tower 3. In practical application, one end of the pipeline of the third demister cleaning structure 38 is arranged in the tower and is in a scroll shape, a plurality of liquid spray heads are arranged at intervals, and the other end of the pipeline is arranged outside the tower and is used for introducing the cleaning liquid.
The purification process of the cyclone washing tower 3 is as follows: the extraction tail gas 1 tangentially enters the tower body from a gas inlet of the cyclone washing tower 3 to achieve the centrifugal separation effect. The extraction tail gas 1 flows from the lower part to the upper part of the cyclone washing tower 3, and simultaneously the washing liquid input from the first washing liquid inlet 31 is radially sprayed out from the spray nozzle 35, dust particles are collected on the wall of the tower, and the particles are washed into the liquid, so that the extraction tail gas 1 is washed. The washed tail gas is upwards dispersed by the baffle disc 36, partial water drops of the tail gas are removed by the demister, and the purified tail gas is discharged from the gas outlet of the cyclone washing tower 3 and then is input into the first washing tower 4. The waste washing liquid after washing the tail gas in the tower flows into the first waste liquid tank 32 and is discharged from the third waste liquid outlet 33. When the third demister 37 needs to be cleaned, a valve of the third demister cleaning structure 38 is opened to input the cleaning liquid, and the third demister 37 is cleaned. The cleaning waste liquid flows into the first waste liquid tank 32 and is discharged from the third waste liquid outlet 33.
With continued reference to fig. 1, both first scrubber tower 4 and second scrubber tower 7 include a multi-layer spray scrubbing structure 43, or alternatively, either first scrubber tower 4 or second scrubber tower 7 includes a multi-layer spray scrubbing structure 43. That is, it may be that both first scrubber tower 4 and second scrubber tower 7 include multi-layer spray scrubbing structure 43, or only first scrubber tower 4 includes multi-layer spray scrubbing structure 43, or only second scrubber tower 7 includes multi-layer spray scrubbing structure 43.
The multi-layer spray washing structure 43 is axially arranged in the tower at intervals and can spray washing liquid to the tower bottom. The first gas inlet 41, the third gas inlet 71 and the fourth gas inlet 72 are disposed on the column wall between the lowermost spray scrubbing structure 43 and the bottom of the column. Because tail gas flows from the bottom of the tower to the top of the tower after entering the tower, the multi-layer spraying and washing structure 43 is arranged, the tail gas can be washed for many times, and the washing effect of the tail gas can be better. The number of the spraying washing structures 43 may be 2, 3, 4, etc., and the embodiment of the present invention is not limited by comparison, and fig. 1 shows a schematic diagram when the number of the spraying washing structures 43 is 3.
In practical applications, the spray scrubbing structure 43 includes a conduit 431 and a plurality of spray headers 432. As shown in fig. 1, one end of the pipeline 431 is located in the tower and is in a spiral shape, and a plurality of spray headers 432 are arranged at intervals, and the other end of the pipeline 431 is located outside the tower and is used for introducing a washing liquid; the plurality of spray headers 432 are used to spray a washing liquid toward the bottom of the tower. One end of the pipeline 431 is in a scroll shape, so that the washing liquid sprayed downwards is more uniform, and the tail gas purification effect is better.
In the actual production of the phosphamidon, besides the extraction tail gas 1 and the granulation tail gas 10, other overproof waste gases 2 can be generated, and further, in the phosphamidon tail gas evolution device provided by the embodiment of the invention, the first washing tower 4 further comprises a second gas input port 42, and the second gas input port 42 is arranged on the tower wall between the spraying and washing structure 43 at the bottommost layer and the tower bottom and is used for inputting the other overproof waste gases 2, so that the other overproof waste gases 2 generated in the phosphamidon production can be purified, resources are fully utilized, and the production environment is better.
Optionally, as shown in fig. 1, each of the first washing tower 4 and the second washing tower 7 further includes a first demister 73 and a first demister washing structure 74; alternatively, first scrubber 4 or second scrubber 7 further includes a first demister 73 and a first demister washing structure 74. That is, both the first washing tower 4 and the second washing tower 7 may further include the first demister 73 and the first demister cleaning structure 74, only the first washing tower 4 may further include the first demister 73 and the first demister cleaning structure 74, only the second washing tower 7 may further include the first demister 73 and the first demister cleaning structure 74.
The first demister 73 is arranged in the tower and is positioned between the topmost spray washing structure 43 and the top of the tower; the first demister cleaning structure 74 is disposed in the tower between the first demister 73 and the top of the tower.
The first demister 73 may separate liquid droplets entrained in the off-gas in the first scrubber tower 4 and the second scrubber tower 7, and the first demister cleaning structure 74 may clean the first demister 73.
In practical applications, a second waste liquid tank 45 is integrally provided at the bottom of the first washing tower 4, and a third waste liquid tank 76 is integrally provided at the bottom of the second washing tower 7. The first washing tower 4 comprises a first waste liquid outlet 44 arranged at the bottom of the tower, the first waste liquid outlet 44 is communicated with a second waste liquid tank 45, and the cyclone washing tower 3 comprises a first washing liquid inlet 31; the first waste liquid outlet 44 is communicated with the first washing liquid inlet 31, so that the washing waste liquid generated by the first washing tower 4 can be input into the cyclone washing tower 3 to be used as washing liquid, resources are saved, and the washing waste liquid of the next-stage first washing tower 4 is cleaner than that of the previous-stage cyclone washing tower 3, and the washing waste liquid of the next-stage first washing tower 4 is input into the previous-stage cyclone washing tower 3 to be recycled as the washing waste liquid, so that the washing effect of the cyclone washing tower 3 is less influenced; and/or the second washing tower 7 comprises a second waste liquid outlet 75 arranged at the bottom of the tower, the second waste liquid outlet 75 is communicated with a third waste liquid tank 76, and the absorption tower 6 comprises a second washing liquid inlet 61; the second waste liquid outlet 75 is communicated with the second washing liquid inlet 61, so that the washing waste liquid generated by the second washing tower 7 can be input into the absorption tower 6 to be used as the washing liquid, resources are saved, and the washing waste liquid of the next-stage second washing tower 7 is cleaner than the washing waste liquid of the previous-stage absorption tower 6, the washing waste liquid of the next-stage second washing tower 7 is input into the previous-stage absorption tower 6 to be recycled as the washing waste liquid, and the influence on the washing effect of the absorption tower 6 is small.
Specifically, the phosphorus ammonia tail gas purification system provided by the embodiment of the present invention may be that the first washing tower 4 includes a first waste liquid outlet 44 disposed at the bottom of the tower, the cyclone washing tower 3 includes a first washing liquid inlet 31, the first waste liquid outlet 44 is communicated with the first washing liquid inlet 31, the second washing tower 7 includes a second waste liquid outlet 75 disposed at the bottom of the tower, the absorption tower 6 includes a second washing liquid inlet 61, and the second waste liquid outlet 75 is communicated with the second washing liquid inlet 61; only the first washing tower 4 comprises a first waste liquid outlet 44 arranged at the bottom of the tower, the cyclone washing tower 3 comprises a first washing liquid inlet 31, and the first waste liquid outlet 44 is communicated with the first washing liquid inlet 31; it is also possible that only the second washing column 7 includes the second waste liquid outlet 75 provided at the bottom of the column, and the absorption column 6 includes the second washing liquid inlet 61, and the second waste liquid outlet 75 communicates with the second washing liquid inlet 61.
The purification process of the first washing tower 4 is as follows: the extraction tail gas 1 output from the gas output port of the cyclone washing tower 3 enters the lower part of the first washing tower 4 from the first gas input port 41 of the first washing tower 4, meanwhile, other waste gas 2 exceeding the standard enters the lower part of the first washing tower 4 from the second gas input port 42 of the first washing tower 4, the mixed tail gas flows upwards from the lower part of the first washing tower 4, meanwhile, after the mixed tail gas is washed and purified by the multilayer spraying and washing structure 43 and liquid drops are removed by the first demister 73, the mixed tail gas is output from the gas output port of the first washing tower 4 and then enters the defoaming tower 5. When the first demister 73 needs to be cleaned, a valve of the first demister cleaning structure 74 is opened to input the cleaning liquid, and the first demister 73 is cleaned. The washing waste liquid flows into the second waste liquid tank 45 at the bottom of the first washing tower 4 and is finally self-recycled or fed into the first washing liquid inlet 31 of the cyclone washing tower 3.
The purification process of the second washing tower 7 is as follows: the tail gas output from the gas output port of the absorption tower 6 enters the lower part of the second washing tower 7 from the third gas input port 71 of the second washing tower 7, meanwhile, the granulation tail gas 10 enters the lower part of the second washing tower 7 from the fourth gas input port 72 of the second washing tower 7, the mixed tail gas flows upwards from the lower part of the second washing tower 7, and meanwhile, the mixed tail gas is washed and purified by the multi-layer spraying and washing structure 43, liquid drops are removed by the first demister 73, and then the mixed tail gas is output from the gas output port of the second washing tower 7 and then enters the chimney 8 to be discharged. When the first demister 73 needs to be cleaned, a valve of the first demister cleaning structure 74 is opened to input the cleaning liquid, and the first demister 73 is cleaned. The waste cleaning liquid flows into a third waste liquid tank 76 at the bottom of the second washing tower 7 and is finally recycled or fed into the second cleaning liquid inlet 61 of the absorption tower 6.
Because there are impurity in the washing waste liquid of first scrubbing tower 4 and second scrubbing tower 7 to in practical application, be provided with filtration 9 between first waste liquid export 44 and the first washing liquid entry 31, and be provided with between second waste liquid export 75 and the second washing liquid entry 61 respectively, thereby make the washing liquid of inputing in whirlwind scrubbing tower 3 and the absorption tower 6 cleaner, and then improved the purifying effect of tail gas.
As shown in fig. 1, the filtering structure 9 includes a plurality of filtering assemblies 91, and the plurality of filtering assemblies 91 are arranged in parallel, so that the filtering effect of the washing waste liquid is better. And the more the filter assemblies 91 are arranged in parallel, when the washing waste liquid flows through the filter assemblies 91, not only the filtering effect is better, but also the filtering speed is faster, of course, a person skilled in the art can set the number of the filter assemblies 91 according to actual requirements, and fig. 1 shows a schematic diagram that the number of the filter assemblies 91 is 2.
In practical applications, since a plurality of filter assemblies 91 are arranged in parallel, all filter assemblies 91 or a part of branch filter assemblies 91 can be selected according to requirements. Each of the filter assemblies 91 is provided with a valve 912 in a branch, which is capable of closing the valve 912 of the branch when the branch is not used, or closing the valve 912 of the branch when the branch needs to be serviced. Each filtering assembly 91 comprises a plurality of filters 911 connected in series, so that a plurality of stages of filtering are formed on the same branch, and the filtering effect of the washing waste liquid is better, as shown in fig. 1, which shows a schematic diagram of 2 filters 911.
As the filter 911, a Y-filter can be used. The Y-filter is Y-shaped and is a small device for removing small amounts of solid particles from a liquid. Specifically, in the Y-type filter, after washing waste liquid enters the filter cartridge with a certain size of filter screen, impurities are blocked and deposited at one end of the Y-type filter, and clean washing waste liquid is discharged from the outlet at the other end of the Y-type filter. And the Y-shaped filter also has the advantages of advanced structure, small resistance and convenient pollution discharge.
Optionally, phosphorus ammonia tail gas clean-up system includes a plurality of absorption towers 6, and the gas input port of a plurality of absorption towers 6 communicates with the gas delivery outlet of defoaming tower 5 jointly, and the gas delivery outlet of a plurality of absorption towers 6 communicates with the third gas input port 71 of second scrubbing tower 7 jointly to not only can make the tail gas purifying effect better, also can improve the purification rate of tail gas. The number of the absorption towers 6 may be 2, 3, 4, etc., which is not limited in the embodiment of the present invention, and fig. 1 shows a schematic diagram of 2 absorption towers 6.
In practical application, as shown in fig. 1, two waste liquid outlets are arranged at the bottom of the absorption tower 6, wherein one waste liquid outlet can convey the washing waste liquid of the absorption tower 6 into the second washing liquid inlet 61 of the absorption tower 6, so as to form recycling of the washing waste liquid of the absorption tower; when the washing liquid is dirty, the washing waste liquid can be discharged from another waste liquid outlet. Of course, the washing liquid may be drawn from the reservoir 12 and introduced into the second washing liquid inlet 61, or the washing liquid may be introduced into the second washing liquid inlet 61 through the second waste liquid outlet 75 of the second washing tower 7.
With continued reference to fig. 1, two sets of packing 62 and washing means 63, a set of fourth demister 64, and a fourth demister washing structure 65 are provided in the absorption tower 6 in this order from the bottom to the top.
The purification process of the absorption tower 6 is as follows: the tail gas input from the gas output port of the defoaming tower 5 enters the lower part of the absorption tower 6 from the gas input port of the absorption tower 6, passes through the filler 62 and the washing mechanism 63 for washing, is subjected to liquid drop removal by the fourth demister 64, is output from the gas output port of the absorption tower 6, and then enters the second washing tower 7. When the fourth demister 64 needs to be cleaned, a valve of the fourth demister cleaning structure 65 is opened to input the cleaning solution, and the fourth demister 64 is cleaned. The cleaning waste liquid flows into a waste liquid tank at the bottom of the absorption tower 6 and is finally discharged out of the tower or is recycled.
As shown in fig. 1, the demister tower 5 includes a second demister 51 and a second demister washing structure 52. The second demister 51 is arranged in the tower and is positioned between the demister 53 of the defoaming tower 5 and the top of the tower; the second demister cleaning structure 52 is disposed in the tower between the second demister 51 and the top of the tower. Wherein, demister 53 can effectively get rid of the droplet of 3um ~ 5um by the liquid drop of gaseous smuggleing secretly in the knockout tower, and then reduces the impurity that the liquid drop carried in the tail gas. The second demister 51 may further separate liquid droplets entrained in the gas in the tower, and the second demister cleaning structure 52 may clean the second demister 51.
In practice, two waste liquid outlets are arranged at the bottom of the defoaming tower 5, wherein one of the waste liquid outlets can input the washing waste liquid of the defoaming tower 5 into the washing liquid inlet of the second demister cleaning structure 52, so that the washing waste liquid can be recycled; when the washing liquid is dirty, the washing waste liquid can be discharged from another waste liquid outlet. Of course, the second demister cleaning structure 52 may also be fed with washing liquid via the reservoir 12.
The purification process of the defoaming tower 5 comprises the following steps: the off gas input from the gas output port of the first washing tower 4 enters the lower part of the demister tower 5 from the gas input port of the demister 53, is subjected to liquid droplet removal by the demister 53 and the second demister 51, is output from the gas output port of the demister tower 5, and then enters the absorption tower 6. When the second demister 51 needs to be cleaned, a valve of the second demister cleaning structure 52 is opened to input the cleaning liquid, and the second demister 51 is cleaned. The washing waste liquid flows into the waste liquid tank of the demister 53 and is finally discharged outside the tower.
Generally, the tail gas blower 11 is arranged between the gas output port of the defoaming tower 5 and the gas input port of the absorption tower 6, between the gas output port of the absorption tower 6 and the third gas input port 71 of the second washing tower 7, and on the input pipeline of the fourth gas input port 72 of the second washing tower 7, and between the gas output port of the second washing tower 7 and the chimney 8, so as to pressurize the tail gas.
In practical application, the washing liquid generally uses primary water, and a proper amount of sulfuric acid is added into the washing liquid of the second washing tower 7, so that the tail gas purification effect is better.
According to the phosphorus ammonia tail gas purification system provided by the embodiment of the invention, the purified tail gas can reach the current tail gas emission standard, the environmental protection problem in phosphorus ammonia production is effectively solved, and the risk that the environmental protection of enterprises exceeds the standard is reduced. Table 1 shows a comparison of tail gas data between the existing ammonium phosphate tail gas purification device and the ammonium phosphate tail gas purification system provided by the embodiment of the present invention, and it can be seen from the table that the ammonium phosphate tail gas purification system provided by the embodiment of the present invention has a good purification effect on tail gas, and can reach the existing tail gas emission standard.
Table 1 exhaust gas data of the system for purifying p-ammoniacal exhaust gas provided in the prior art and in the examples of the present invention
| Particulate matter | Ammonia | Fluoride compounds | |
| Existing | 123mg/m3 | 6500mg/m3 | 312mg/m3 |
| Examples of the invention | 23mg/m3 | 1200mg/m3 | 8mg/m3 |
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.
Claims (10)
1. A phosphorus ammonia tail gas purification system is characterized by comprising a cyclone washing tower, a first washing tower, a defoaming tower, an absorption tower and a second washing tower;
a gas input port of the cyclone washing tower is used for inputting extraction tail gas, and a gas output port is communicated with a first gas input port of the first washing tower;
the gas output port of the first washing tower is communicated with the gas input port of the defoaming tower;
the gas output port of the defoaming tower is communicated with the gas input port of the absorption tower;
the gas output port of the absorption tower is communicated with the third gas input port of the second washing tower;
and a fourth gas input port of the second washing tower is used for inputting granulation tail gas, and a gas output port is communicated with a chimney.
2. The system of claim 1, wherein the first scrubber and the second scrubber each comprise a multi-layer spray scrubbing structure, or wherein the first scrubber or the second scrubber comprises a multi-layer spray scrubbing structure;
the multiple layers of spraying and washing structures are axially arranged in the tower at intervals and can spray washing liquid to the tower bottom;
the first gas input port, the third gas input port and the fourth gas input port are arranged on the tower wall between the spray washing structure at the bottommost layer and the tower bottom.
3. The system of claim 2, wherein the spray scrubbing structure comprises a plurality of spray headers and a conduit;
one end of the pipeline is positioned in the tower and is in a spiral shape, and a plurality of spray headers are arranged at intervals; the other end of the pipeline is positioned outside the tower and is used for introducing washing liquid;
the plurality of spray headers are used for spraying the washing liquid to the tower bottom.
4. The system of claim 2, wherein the first scrubber tower further comprises a second gas inlet disposed on the tower wall between the spray scrubbing structure at the bottom and the tower bottom for introducing other waste gas beyond the standard.
5. The phosphorus ammonia tail gas purification system of claim 2, wherein the first scrubber and the second scrubber each further comprise a first demister and a first demister cleaning structure; or the first washing tower or the second washing tower further comprises a first demister and a first demister cleaning structure;
the first demister is arranged in the tower and is positioned between the spraying and washing structure at the topmost layer and the tower top;
the first demister cleaning structure is arranged in the tower and is positioned between the first demister and the top of the tower.
6. The system of claim 1, wherein the first scrubber comprises a first waste liquid outlet disposed at a bottom of the tower, and the cyclone scrubber comprises a first scrubbing liquid inlet; the first waste liquid outlet is communicated with the first washing liquid inlet;
and/or the presence of a gas in the gas,
the second washing tower comprises a second waste liquid outlet arranged at the bottom of the tower, and the absorption tower comprises a second washing liquid inlet; the second waste liquid outlet is communicated with the second washing liquid inlet.
7. The system according to claim 6, wherein a filtering structure is disposed between the first waste liquid outlet and the first washing liquid inlet, and between the second waste liquid outlet and the second washing liquid inlet.
8. The system of claim 7, wherein the filter structure comprises a plurality of filter assemblies, and wherein the plurality of filter assemblies are arranged in parallel.
9. The system according to claim 1, comprising a plurality of the absorption towers;
and the gas input ports of the absorption towers are communicated with the gas output port of the defoaming tower, and the gas output ports of the absorption towers are communicated with the third gas input port of the second washing tower.
10. The system of claim 1, wherein the demister tower comprises a second demister and a second demister washing structure;
the second demister is arranged in the tower and is positioned between the demister of the defoaming tower and the top of the tower;
the second demister cleaning structure is arranged in the tower and is positioned between the second demister and the top of the tower.
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| CN202110172115.9A CN112807924A (en) | 2021-02-08 | 2021-02-08 | Phosphorus ammonia tail gas clean-up system |
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| CN202110172115.9A CN112807924A (en) | 2021-02-08 | 2021-02-08 | Phosphorus ammonia tail gas clean-up system |
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Application publication date: 20210518 |