CN113289485A - Wet desulphurization system for synthesis ammonia feed gas - Google Patents
Wet desulphurization system for synthesis ammonia feed gas Download PDFInfo
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- CN113289485A CN113289485A CN202110540448.2A CN202110540448A CN113289485A CN 113289485 A CN113289485 A CN 113289485A CN 202110540448 A CN202110540448 A CN 202110540448A CN 113289485 A CN113289485 A CN 113289485A
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- tower
- drainage plate
- desulfurizing tower
- feed gas
- annular partition
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 17
- 230000015572 biosynthetic process Effects 0.000 title claims description 13
- 238000003786 synthesis reaction Methods 0.000 title claims description 13
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 134
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 134
- 239000004571 lime Substances 0.000 claims abstract description 134
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 107
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 238000001556 precipitation Methods 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 103
- 238000005192 partition Methods 0.000 claims description 51
- 238000007790 scraping Methods 0.000 claims description 43
- 238000004140 cleaning Methods 0.000 claims description 32
- 238000005096 rolling process Methods 0.000 claims description 23
- 238000005507 spraying Methods 0.000 claims description 8
- 238000006477 desulfuration reaction Methods 0.000 abstract description 76
- 230000023556 desulfurization Effects 0.000 abstract description 75
- 238000006243 chemical reaction Methods 0.000 abstract description 49
- 230000033001 locomotion Effects 0.000 abstract description 4
- 241000197194 Bulla Species 0.000 abstract description 2
- 208000002352 blister Diseases 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 139
- 239000002994 raw material Substances 0.000 description 23
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 13
- 239000000428 dust Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0808—Cleaning containers having tubular shape, e.g. casks, barrels, drums by methods involving the use of tools, e.g. by brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the technical field of wet desulphurization, and particularly relates to a wet desulphurization system for a feed gas for synthetic ammonia, which comprises a desulphurization tower, a circulating tower, an air cooler, a motor, a demisting unit and a precipitation shower; the circulating tower is arranged on one side of the desulfurization tower, a liquid conveying pipe in the circulating tower is communicated with a liquid inlet pipe in the precipitation and sprinkling device, and the liquid inlet pipe in the circulating tower is communicated with the bottom of the desulfurization tower; through the drainage plate, cooperation between through-hole and the scraper blade, the lime thick liquid that is continuous assembles the drainage plate bottom, assemble in the drainage plate bottom and form the lime thick liquid layer, the feed gas is got into by the desulfurization tower bottom, through the through-hole rises and passes the lime thick liquid layer, the tympanic bulla and go out, the motor rotates and drives the transmission shaft and rotate, thereby drive the scraper blade motion, the scraper blade is continuous with the lime thick liquid of drainage plate bottom evenly scrape and is smeared in the drainage plate bottom, prevent that the partial area lime thick liquid of drainage plate bottom from reducing and even having consumed, improve the desulfurization quality of desulfurizing tower, thereby improve the liquid-gas reaction efficiency of desulfurizing tower.
Description
Technical Field
The invention belongs to the technical field of wet desulphurization, and particularly relates to a wet desulphurization system for feed gas for ammonia synthesis.
Background
The wet desulfurization is characterized in that a desulfurization system is positioned at the tail end of a flue and behind a dust remover, and the reaction temperature in the desulfurization process is lower than the dew point, so the desulfurized flue gas can be discharged only by reheating. Because of the gas-liquid reaction, the desulfurization reaction speed is high, the efficiency is high, and the utilization rate of the desulfurization additive is high, when lime is used as a desulfurizer, the desulfurization rate can reach 90 percent when Ca/S is 1, and the method is suitable for flue gas desulfurization of large coal-fired power stations. The current non-electric power industry flue gas desulfurization technologies mainly comprise wet desulfurization, semi-dry desulfurization and dry desulfurization, the wet desulfurization is divided into technologies of a calcium method, a sodium method, a magnesium method, a seawater method and the like according to different desulfurizers, and the main desulfurizing towers are in the forms of spray tower washing, packed bed washing, venturi washing and the like.
A technical solution related to a wet desulphurization system for a feed gas for ammonia synthesis has also appeared in the prior art, and for example, a chinese patent with application number CN2020109529872 discloses a wet desulphurization device, which comprises: the device comprises a desulfurizing tower, and a flue gas inlet section, a desulfurizing effect-improving component, a spraying layer and a demisting layer which are arranged in the desulfurizing tower from bottom to top in sequence; a flue gas rectification module is arranged in the desulfurization effect-improving component; according to the technical scheme, the flow field distribution of the flue gas is interfered by the flue gas rectification module, so that the distribution of the flue gas flow field and the distribution of the spray liquid drops tend to be consistent, and the contact strength and the uniformity of the flue gas and the spray liquid drops are improved; the liquid drops sprayed out through the spraying layer are distributed to be high in liquid drop amount in the center of the spraying layer and low in liquid drop amount at the periphery of the spraying layer; the concentration distribution patterns of the flue gas and the spray liquid drops are consistent, so that the uniform mixing of gas and liquid is realized, and the desulfurization and dust removal efficiency is improved; but this technical scheme exists not enoughly, and the flow field distribution of rectification module to the flue gas intervenes, enlarges the distribution area of flue gas, but the density of flue gas reduces in the desulfurizing tower, influences desulfurization effect key factor and is the liquid-gas ratio, and the notion of liquid-gas ratio in the gas desulfurization is: absorption 1m3The liquid volume required for the gas in question, i.e. L/G-Q/1000: V (Nm)3H); wherein Q is the flow of the lime slurry, V is the flow of the gas entering the absorption tower, and the flow m of the lime slurry31000/h (L/h) gas flow (Nm)3H) liquid-gas ratio (L/m)3) (ii) a Lime slurry and gas flow do not change, and gas density reduces, and the lime slurry is too much to contact with gas, can lead to gaseous water content to increase, increases the corruption of follow-up equipment, increases the burden of defroster simultaneously, blocks up defroster and pipeline, reduces gaseous lift, influences desulfurization system's safety and stability's operation.
In view of the above, the present invention provides a wet desulphurization system for feed gas for ammonia synthesis, which solves the above problems.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problems of incomplete gas desulfurization reaction caused by uneven liquid-gas contact, small reaction area and incomplete contact under the condition of a specified liquid-gas ratio of a plate-tower type desulfurization tower, the invention provides a wet desulphurization system for feed gas for ammonia synthesis.
The technical scheme adopted by the invention for solving the technical problems is as follows: the wet desulphurization system for the feed gas for the synthetic ammonia comprises a desulphurization tower, a circulating tower, an air cooler, a motor, a demisting unit and a precipitation shower; the circulating tower is arranged on one side of the desulfurization tower, a liquid conveying pipe in the circulating tower is communicated with a liquid inlet pipe in the precipitation and sprinkling device, and the liquid inlet pipe in the circulating tower is communicated with the bottom of the desulfurization tower; the demisting unit is arranged at the top in the desulfurizing tower, and a shower falling device is arranged in the desulfurizing tower and is positioned below the demisting unit; the air cooler is arranged on one side of the desulfurization tower adjacent to the circulating tower; the motor is arranged at the bottom of the desulfurization tower; the central position of the bottom of the desulfurization tower is rotatably connected with a transmission shaft, one end of the transmission shaft is positioned in the desulfurization tower, the other end of the transmission shaft penetrates through the bottom of the desulfurization tower and is positioned outside the desulfurization tower, and the transmission shaft is fixedly connected with an output shaft in a motor; a group of drainage plates are uniformly and fixedly connected in the desulfurizing tower, and each drainage plate is positioned below the precipitation device; one end of the transmission shaft, which is positioned in the desulfurizing tower, is rotatably connected with the drainage plate close to the precipitation device; a group of through holes are uniformly formed in the drainage plate; the position symmetry that lies in the drainage plate bottom on the transmission shaft installs the scraping rod, and every scraping rod contacts bottom the drainage plate, realizes that the transmission shaft drives the scraping rod and slightly cuts and rubs the drainage plate bottom.
When the lime slurry desulfurization device is used, a motor, a circulating tower and a desulfurization tower are started, the circulating tower conveys lime slurry to a falling sprayer through a pipeline, the lime slurry passes through the falling sprayer, falling spraying is carried out according to a specified liquid-gas ratio, namely the flow m/h L/h of the lime slurry, namely the gas flow Nm/h L/m of the liquid-gas ratio, raw material gas is conveyed into the desulfurization tower through a gas inlet part of the desulfurization tower, the gas temperature of the raw material gas before entering the desulfurization tower is higher than the temperature, the raw material gas starts to rise after entering the desulfurization tower and contacts and washes the lime slurry discharged by the falling sprayer, and a chemical reaction, namely SO + HO → HSO absorption, CaCO + HSO → CaSO + CO + HO neutralization is generated; in the prior sieve plate tower technology, liquid enters from the top of a desulfurizing tower, descends plate by plate through an overflow pipe, and accumulates a lime slurry liquid layer at the bottom of the plate, the desulfurization is an endothermic reaction, the desulfurizing tower is heated when in work, under the long-time work, part of lime slurry which does not flow down on a tower plate is solidified and reacts to form scale on the plate, the desulfurization area is reduced, the desulfurization efficiency is reduced, and even the weight of the tower plate is increased to damage the tower plate and the desulfurizing tower; through the matching among the drainage plate, the through hole and the scraping rod, lime slurry continuously converges to the bottom of the drainage plate, a lime slurry liquid layer is converged at the bottom of the drainage plate, feed gas enters from the bottom of the desulfurization tower, rises through the through hole, passes through the lime slurry liquid layer, bubbles and exits, the motor rotates to drive the transmission shaft to rotate, so that the scraping rod is driven to move, the scraping rod continuously and uniformly scrapes the lime slurry at the bottom of the drainage plate, the lime slurry in a part of area of the bottom of the drainage plate is prevented from being reduced and even consumed, the desulfurization quality of the desulfurization tower is improved, and the liquid-gas reaction efficiency of the desulfurization tower is improved; due to the arrangement of the scraping rod, in a long-time working state, a lime slurry layer at the bottom of the drainage plate is scaled, the scraping rod is in contact with the drainage plate and moves along with the transmission shaft to scrape lime scales, the reduction of the desulfurization area and the desulfurization efficiency caused by scaling are avoided, and the damage to the drainage plate and the desulfurization tower caused by even the increase of the weight of the drainage plate is avoided; sulfur dioxide in the feed gas and a lime slurry liquid layer are subjected to catalytic reaction to form calcium sulfate floccules, the floccules generated after the lime slurry liquid reaction flow to the bottom of the desulfurization tower or drop to the bottom of the desulfurization tower under the influence of gravity, flow into the circulating tower along a pipeline, are treated by the circulating tower and are conveyed to the precipitation device again for desulfurization, and the recycling of the lime slurry liquid is increased; the reacted feed gas passes through the through hole and continuously rises until entering the demisting unit, and the demisting unit is treated and then discharged through the exhaust part of the desulfurizing tower.
Preferably, the cross sections of the drainage plate and the scraping rod are both in a semi-circular arc shape, the scraping rod is made of rubber, and the drainage plate is in a cover shape; the aperture of the through hole at the top end of the drainage plate is larger than that at the bottom end of the drainage plate.
When the lime slurry desulfurization tower is used, the cross sections of the drainage plate and the scraping rod are both in a semi-circular arc shape, lime slurry falls and is sprayed onto the drainage plate and flows along the arc-shaped outer surface of the drainage plate, when the lime slurry flows, one through hole is formed in each way, a part of the lime slurry passes through the through holes and is gathered on the inner surface of the drainage plate, the scraping rod uniformly scrapes and smears the inner surface of the drainage plate, the flowing distance of the lime slurry is increased, the coverage area of a lime slurry layer is increased, the liquid-gas reaction area is increased, the reaction efficiency of the desulfurization tower is increased, the lime slurry is prevented from falling and being sprayed on the smooth drainage plate and directly flowing down through the through holes, the contact between the lime slurry and feed gas is insufficient, and the reaction effect is reduced; through setting up the through-hole both ends aperture difference, the through-hole is located the aperture on drainage plate top, be greater than the aperture that is located the drainage plate bottom, the flow that lime thick liquid flows in the through-hole top is greater than the flow that the through-hole bottom flows, make store the fractional lime thick liquid in the through-hole, supply with every through-hole bottom and flow, assemble into lime thick liquid layer, ensure the lime thick liquid that flows of every through-hole bottom, further increase the coverage area of lime thick liquid layer, increase liquid gas reaction area, increase the reaction efficiency of desulfurizing tower, it is inhomogeneous to prevent that lime thick liquid from flowing coverage area, the volume that some lime thick liquid flows the through-hole is less, make the unable long-time lime thick liquid that flows in the through-hole bottom, form lime thick liquid layer.
Preferably, one of the adjacent scraping rods is uniformly provided with a group of grooves, and a rolling brush is rotatably connected in each groove through a rotating shaft; the rolling brush is attached to the bottom end of the drainage plate.
When the device is used, the lime slurry liquid layer reacts with the feed gas by arranging the rolling brush, the lime slurry reacts into calcium sulfate floccules and drips to the bottom of the desulfurization tower, the transmission shaft rotates to drive the scraping rod to move, the scraping rod drives the rolling brush to move, the rolling brush is attached to the bottom end of the drainage plate, the rolling brush is rubbed and rolled by the bottom end of the drainage plate, the bottom end of the drainage plate is uniformly and repeatedly coated, the possibility that the lime slurry does not exist at the bottom of the drainage plate is prevented, the coverage area of the lime slurry liquid layer is increased, the liquid-gas reaction area is increased, and the reaction efficiency of the desulfurization tower is increased; because the rolling brush is arranged, the rolling brush rolls to be stained with and attached away, the calcium sulfate floccule and the feed gas are stained with dust impurities attached to the lime slurry liquid layer after being washed, the contact of the feed gas during flowing is prevented, secondary pollution is prevented, the reaction is not uniform, the cleanliness of the lime slurry liquid layer is increased, and the cleanliness of the feed gas is increased.
Preferably, a group of annular partition plates are uniformly and fixedly connected to the inner wall of the desulfurization tower, and the annular partition plates are inclined downwards; the top end of the annular partition plate is fixedly connected with the bottom end of the drainage plate, and through holes are formed in the contact positions of the drainage plate and the annular partition plate, so that the lime slurry on the annular partition plate flows downwards through the through holes; one end of the annular partition plate, which is far away from the inner wall of the desulfurization tower, is positioned at the lower position inside the drainage plate; the inside of annular baffle is hollow, and the inside and the air-cooler of annular baffle pass through the pipeline intercommunication.
When the device is used, a feed gas enters the desulfurizing tower and rises upwards, the annular partition plate is arranged, the feed gas flows to the drainage plate through the inner ring of the annular partition plate, the diameter of the inner ring of the annular partition plate is smaller than that of the outer ring of the drainage plate, when the feed gas flows through the annular partition plate, the airflow channel is reduced, the flow speed of the feed gas is increased in a short time, so that the feed gas generates slight wind power and is uniformly bubbled out of each through hole, the situation that the wind power of the feed gas is insufficient, bubbling cannot be performed in a short time, and a large amount of the feed gas is sprayed out of a small number of bubbles after being accumulated to a certain air pressure, so; and when the lime slurry washes and desulfurizes the feed gas, the water vapor in the feed gas is dissolved into the lime slurry, so that the lime slurry is diluted, incomplete desulfurization of the feed gas is caused, and the reaction efficiency of the desulfurizing tower is further improved.
Preferably, cleaning rods are symmetrically arranged between adjacent drainage plates on the transmission shaft; the cleaning rod is fixedly connected with a brush.
When the device is used, feed gas enters the desulfurizing tower and contacts the inner wall of the desulfurizing tower, impurities in the feed gas are contaminated and adsorbed on the inner wall of the desulfurizing tower or the annular partition plate, the temperature in the desulfurizing tower is high under the long-time working state of the desulfurizing tower, lime slurry scales on the inner wall of the desulfurizing tower and the annular partition plate, and the cleaning rod is driven to move due to the arrangement of the cleaning rod and the brush, so that on one hand, the brush on the cleaning rod brushes off dirt and dust on the inner wall of the desulfurizing tower or the annular partition plate, the cleaning degree in the desulfurizing tower is increased, and the cleaning degree of the feed gas is increased; on the other hand, after the brush on the cleaning rod brushes dirt and dust, incomplete reaction of the feed gas caused by insufficient contact of the dirt and lime slurry is avoided, and the reaction efficiency of the desulfurizing tower is increased.
Preferably, the section of the cleaning rod consists of a straight line a and a straight line b, the straight line a is close to the annular partition plate, and the straight line b is close to the inner wall of the desulfurization tower, so that the brush on the cleaning rod is contacted with the annular partition plate and the inner wall of the desulfurization tower; the cross section of the hairbrush is semicircular.
When the semi-circular brush is used, the semi-circular brush is used for scraping and rubbing thick or hard-to-solidify dirt when the brush cleans the thick or hard-to-solidify dirt, so that the cleaning degree in the desulfurizing tower is further increased, and the cleaning degree of the feed gas is increased; because the clean pole cross-section of clean pole is become by straight line a and straight line b, increase clean pole volume, when clean pole motion, slightly stir the feed gas in the desulfurizing tower, accelerate the movement velocity of feed gas, the feed gas velocity of flow increases for a short time, make the feed gas produce light wind-force, further accelerate the speed when the feed gas passes through ring seal annular baffle inner circle, even bubble from every through-hole and go out, make the feed gas reaction sufficient, increase liquid-gas reaction efficiency, thereby improve the liquid-gas reaction efficiency of desulfurizing tower.
The invention has the following beneficial effects:
1. according to the wet desulphurization system for the feed gas for the synthetic ammonia, the feed gas enters from the bottom of the desulphurization tower through the matching among the drainage plate, the through hole and the scraping rod, the feed gas rises through the lime slurry layer through the through hole and is bubbled out, the motor rotates to drive the transmission shaft to rotate so as to drive the scraping rod to move, the scraping rod continuously and uniformly scrapes the lime slurry at the bottom of the drainage plate, the desulphurization quality of the desulphurization tower is improved, and the liquid-gas reaction efficiency of the desulphurization tower is improved.
2. According to the wet desulphurization system for the feed gas for the synthetic ammonia, the cross sections of the drainage plate and the scraping rod are both in a semi-circular arc shape, lime slurry falls and is sprayed onto the drainage plate and flows along the arc-shaped outer surface of the drainage plate, a part of the lime slurry passes through the through hole and is gathered on the inner surface of the drainage plate, the scraping rod is uniformly scraped and smeared on the inner surface of the drainage plate, and the flowing distance of the lime slurry is increased, so that the coverage area of a lime slurry layer is increased, the liquid-gas reaction area is increased, and the reaction efficiency of the desulphurization tower is increased.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
FIG. 4 is an enlarged view of a portion of FIG. 2 at B;
FIG. 5 is a perspective view of a cleaning rod of the present invention;
in the figure: desulfurizing tower 1, circulation tower 2, air-cooler 3, motor 4, defogging unit 5, fall and drench ware 6, drainage plate 61, through-hole 62, annular baffle 63, scrape pole 7, recess 71, rolling brush 72, transmission shaft 8, clean pole 81, brush 82.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to fig. 5, the wet desulphurization system for feed gas for ammonia synthesis according to the present invention comprises a desulphurization tower 1, a circulation tower 2, an air cooler 3, a motor 4, a demisting unit 5 and a precipitation shower 6; the circulating tower 2 is arranged on one side of the desulfurizing tower 1, a liquid conveying pipe in the circulating tower 2 is communicated with a liquid inlet pipe in the falling and sprinkling device 6, and the liquid inlet pipe in the circulating tower 2 is communicated with the bottom of the desulfurizing tower 1; the demisting unit 5 is arranged at the top in the desulfurizing tower 1, the sprinkling device 6 is arranged in the desulfurizing tower 1, and the sprinkling device 6 is positioned below the demisting unit 5; the air cooler 3 is arranged on one side of the desulfurizing tower 1 adjacent to the circulating tower 2; the motor 4 is arranged at the bottom of the desulfurizing tower 1; a transmission shaft 8 is rotatably connected to the center of the bottom of the desulfurizing tower 1, one end of the transmission shaft 8 is positioned in the desulfurizing tower 1, the other end of the transmission shaft 8 penetrates through the bottom of the desulfurizing tower 1 and is positioned outside the desulfurizing tower 1, and the transmission shaft 8 is fixedly connected with an output shaft in the motor 4; a group of drainage plates 61 are uniformly and fixedly connected in the desulfurizing tower 1, and each drainage plate 61 is positioned below the precipitation device 6; one end of the transmission shaft 8, which is positioned in the desulfurizing tower 1, is rotatably connected with the drainage plate 61 close to the spray falling device 6; a group of through holes 62 are uniformly formed in the drainage plate 61; the position symmetry that lies in the drainage plate 61 bottom on the transmission shaft 8 installs scraping rod 7, and every scraping rod 7 contacts bottom drainage plate 61, realizes that the transmission shaft 8 drives scraping rod 7 and slightly cuts a piece of rubbing drainage plate 61 bottom.
When the lime slurry spraying device is used, the motor 4, the circulating tower 2 and the desulfurizing tower 1 are started, the circulating tower 2 conveys lime slurry to the falling sprayer 6 through a pipeline, the lime slurry passes through the falling sprayer 6, and the flow rate m of the lime slurry is determined according to the specified liquid-gas ratio31000L/h gas flow Nm3H is liquid-gas ratio L/m3The raw gas is conveyed into the desulfurizing tower 1 through the gas inlet part of the desulfurizing tower 1, the gas temperature before the raw gas enters the desulfurizing tower 1 is more than 120 ℃, the raw gas begins to rise after entering the desulfurizing tower 1 and contacts and washes lime slurry discharged by the falling shower device 6, and a chemical reaction, namely SO is generated2+H2O→H2SO3Absorption, CaCO3+H2SO3→CaSO3+CO2+H2O neutralization; in the existing sieve plate tower technology, liquid enters from the top of a desulfurizing tower 1, descends plate by plate through an overflow pipe, and accumulates a lime slurry liquid layer at the bottom of the plate, the desulfurization is an endothermic reaction, the desulfurizing tower 1 is heated when working, under the long-time working, part of lime slurry which does not flow down on a tower plate is solidified and reacts to form scale on the plate, the desulfurization area is reduced, the desulfurization efficiency is reduced, and even the weight of the tower plate is increased, so that the tower plate and the desulfurizing tower 1 are damaged; through drainage plate 61, through-hole 62 and scrape the cooperation between the pole 7, the lime thick liquid that is continuous assembles drainage plate 61 bottom, assembles in drainage plate 61 bottom and forms the lime thick liquid layer, and the feed gas is got into by 1 bottom of desulfurizing tower, rises through-hole 62 and passes the lime thick liquid layer, the tympanic bulla and goes out, and motor 4 rotates and drives transmission shaft 8 and rotate to the motion of pole 7 is scraped in the drive, scrapes the lime thick liquid of pole 7 bottom drainage plate 61 constantlyThe lime slurry is uniformly scraped at the bottom of the drainage plate 61, so that the lime slurry in a part of the area of the bottom of the drainage plate 61 is prevented from being reduced and even consumed, the desulfurization quality of the desulfurization tower 1 is improved, and the liquid-gas reaction efficiency of the desulfurization tower 1 is improved; due to the arrangement of the scraping rod 7, in a long-time working state, a lime slurry layer at the bottom of the drainage plate 61 is scaled, the scraping rod 7 is in contact with the drainage plate 61 and moves along with the transmission shaft 8 to scrape lime scale, the reduction of the desulfurization area and the reduction of the desulfurization efficiency caused by scaling are avoided, and the damage to the drainage plate 61 and the desulfurization tower 1 caused by even the increase of the weight of the drainage plate 61 is avoided; sulfur dioxide in the feed gas and a lime slurry liquid layer are subjected to catalytic reaction to form calcium sulfate floccules, the floccules generated after the lime slurry liquid reaction flow to the bottom of the desulfurizing tower 1 or drop to the bottom of the desulfurizing tower under the influence of gravity, flow into the circulating tower 2 along a pipeline, are conveyed to the falling sprayer 6 again through the treatment of the circulating tower 2 for desulfurization, and the recycling of the lime slurry liquid is increased; the reacted raw gas continuously rises through the through hole 62 until entering the demisting unit 5, and the demisting unit 5 is treated and then discharged through the exhaust part of the desulfurizing tower 1.
As an embodiment of the present invention, the cross sections of the drainage plate 61 and the scraping rod 7 are both semi-circular arc, the scraping rod 7 is made of rubber, and the drainage plate 61 is in a cover shape; the aperture of the through hole 62 at the top end of the drainage plate 61 is larger than that at the bottom end of the drainage plate 61.
When the lime slurry desulfurization tower is used, the cross sections of the drainage plate 61 and the scraping rod 7 are both in a semi-circular arc shape, lime slurry falls and is sprayed onto the drainage plate 61 and flows along the arc-shaped outer surface of the drainage plate 61, when the lime slurry flows, one through hole 62 is formed in each way, a part of the lime slurry passes through the through holes 62 and is gathered on the inner surface of the drainage plate 61, the scraping rod 7 is uniformly scraped and smeared on the inner surface of the drainage plate 61, the flowing distance of the lime slurry is increased, the coverage area of the lime slurry layer is increased, the liquid-gas reaction area is increased, the reaction efficiency of the desulfurization tower 1 is increased, the lime slurry is prevented from falling and being sprayed onto the smooth drainage plate 61 and directly flowing down through the through holes 62, the contact between the lime slurry and feed gas is insufficient, and the reaction effect is reduced; through setting up through-hole 62 both ends aperture difference, through-hole 62 is located the aperture on drainage plate 61 top, be greater than the aperture that is located the drainage plate 61 bottom, the flow that lime thick liquid flows into through-hole 62 top is greater than the flow that the through-hole 62 bottom flows, make the interior fractional lime thick liquid that stores of through-hole 62, supply with the outflow of every through-hole 62 bottom, assemble into lime thick liquid layer, ensure the 62 bottom outflow lime thick liquid of every through-hole, further increase the coverage area on lime thick liquid layer, increase liquid-gas reaction area, increase the reaction efficiency of desulfurizing tower 1, it is inhomogeneous to prevent that lime thick liquid from flowing coverage area, the volume that a part lime thick liquid flows through-hole 62 is less, make the unable long-time outflow lime thick liquid in through-hole 62 bottom, form lime thick liquid layer.
As an embodiment of the present invention, one scraping rod 7 of the adjacent scraping rods 7 is uniformly provided with a group of grooves 71, and a rolling brush 72 is rotatably connected in each groove 71 through a rotating shaft; the rolling brush 72 is attached to the bottom end of the drainage plate 61.
When the device is used, the lime slurry layer reacts with the feed gas by arranging the rolling brush 72, the lime slurry reacts to calcium sulfate floccules and drips to the bottom of the desulfurizing tower 1, the transmission shaft 8 rotates to drive the scraping rod 7 to move, the scraping rod 7 drives the rolling brush 72 to move, the rolling brush 72 is attached to the bottom end of the drainage plate 61, the rolling brush 72 is rubbed and rolled by the bottom end of the drainage plate 61, the bottom end of the drainage plate 61 is uniformly and repeatedly coated, the possibility that no lime slurry exists at the bottom of the drainage plate 61 is prevented, the coverage area of the lime slurry layer is increased, the liquid-gas reaction area is increased, and the reaction efficiency of the desulfurizing tower 1 is increased; because the rolling brush 72 is arranged, the rolling brush 72 rolls to be attached and brushed away, the calcium sulfate floccule and the raw material gas are attached to dust impurities on the lime slurry liquid layer after being washed, the raw material gas is prevented from contacting during flowing to cause secondary pollution, the reaction is not uniform, the cleanliness of the lime slurry liquid layer is increased, and therefore the cleanliness of the raw material gas is increased.
As an embodiment of the invention, a group of annular partition plates 63 are uniformly and fixedly connected to the inner wall of the desulfurization tower 1, and the annular partition plates 63 are inclined downwards; the top end of the annular partition plate 63 is fixedly connected with the bottom end of the drainage plate 61, and through holes 62 are formed in the contact positions of the drainage plate 61 and the annular partition plate 63, so that lime slurry on the annular partition plate 63 flows downwards through the through holes 62; one end of the annular partition plate 63, which is far away from the inner wall of the desulfurization tower 1, is positioned at the lower position inside the drainage plate 61; the annular partition 63 is hollow, and the inside of the annular partition 63 is communicated with the air cooler 3 through a pipeline.
When the device is used, a feed gas enters the desulfurizing tower 1 and rises inwards, due to the arrangement of the annular partition plate 63, the feed gas flows to the drainage plate 61 through the inner ring of the annular partition plate 63, the diameter of the inner ring of the annular partition plate 63 is smaller than that of the outer ring of the drainage plate 61, when the feed gas flows through the annular partition plate 63, the airflow channel is reduced, the flow speed of the feed gas is increased in a short time, so that the feed gas generates slight wind power, bubbles uniformly bubble out of each through hole 62, the situation that the wind power of the feed gas is insufficient, bubbles cannot be generated in a short time, and after the gas is accumulated to a certain air pressure, a large amount of bubbles are ejected out from a small part of bubbles, so that the reaction efficiency of a part of the feed gas is insufficient, and the liquid-gas reaction efficiency is increased, so that the liquid-gas reaction efficiency of the desulfurizing tower 1 is improved; and a part of the feed gas contacts the annular partition plate 63 in the rising process, water vapor in the feed gas is liquefied when meeting cold, the feed gas with the water vapor removed is reacted with the lime slurry, and the condition that the lime slurry washes and desulfurizes the feed gas is avoided, the water vapor in the feed gas is dissolved into the lime slurry, so that the lime slurry is diluted, the incomplete desulfuration of the feed gas is caused, and the reaction efficiency of the desulfurizing tower 1 is further improved.
As an embodiment of the present invention, cleaning rods 81 are symmetrically installed on the transmission shaft 8 between adjacent drainage plates 61; the cleaning rod 81 is fixedly connected with a brush 82.
When the device is used, a feed gas enters the desulfurizing tower 1 and contacts the inner wall of the desulfurizing tower 1, impurities in the feed gas are contaminated and adsorbed on the inner wall of the desulfurizing tower 1 or the annular partition plate 63, under the long-time working state of the desulfurizing tower 1, the temperature in the desulfurizing tower 1 is high, lime slurry is scaled on the inner wall of the desulfurizing tower 1 and the annular partition plate 63, and due to the fact that the cleaning rod 81 and the hairbrush 82 are arranged, the transmission shaft 8 rotates to drive the cleaning rod 81 to move, on the one hand, the hairbrush 82 on the cleaning rod 81 brushes off dirt and dust on the inner wall of the desulfurizing tower 1 or the annular partition plate 63, the cleaning degree in the desulfurizing tower 1 is increased, and therefore the cleaning degree of the feed gas is increased; on the other hand, after the brush 82 on the cleaning rod 81 brushes dirt and dust, incomplete reaction of the feed gas caused by insufficient contact of the dirt and lime slurry is avoided, and the reaction efficiency of the desulfurizing tower 1 is increased.
As an embodiment of the invention, the section of the cleaning rod 81 is composed of a straight line a and a straight line b, the straight line a is close to the annular partition 63, the straight line b is close to the inner wall of the desulfurizing tower 1, and the brush 82 on the cleaning rod 81 is contacted with the annular partition 63 and the inner wall of the desulfurizing tower 1; the cross section of the brush 82 is semicircular.
When the device is used, the brush 82 is semicircular in section, so that when the brush 82 cleans some thicker or harder-to-solidify dirt, the semicircular brush 82 rubs the dirt, and the thicker or harder-to-solidify dirt is scraped, so that the cleaning degree in the desulfurizing tower 1 is further increased, and the cleaning degree of the raw material gas is increased; because the clean pole 81 cross-section of clean pole 81 is become by straight line a and straight line b, increase clean pole 81 volume, when clean pole 81 moves, slightly stir the raw material gas in the desulfurizing tower 1, accelerate the moving speed of raw material gas, the raw material gas velocity of flow increases for a short time, make the raw material gas produce slight wind-force, further accelerate the speed when the raw material gas passes through ring seal annular partition 63 inner circle, even bubble and play from every through-hole 62, make the raw material gas reaction sufficient, increase liquid-gas reaction efficiency, thereby improve the liquid-gas reaction efficiency of desulfurizing tower 1.
The specific working process is as follows:
starting a motor 4, a circulating tower 2 and a desulfurizing tower 1, wherein the circulating tower 2 conveys lime slurry to a falling sprayer 6 through a pipeline, the lime slurry passes through the falling sprayer 6 and is subjected to falling spraying according to a specified liquid-gas ratio, and a raw material gas is conveyed into the desulfurizing tower 1 through an air inlet part of the desulfurizing tower 1; the lime slurry continuously converges to the bottom of the drainage plate 61, a lime slurry liquid layer is converged at the bottom of the drainage plate 61, the feed gas enters from the bottom of the desulfurization tower 1, rises through the lime slurry liquid layer through the through hole 62, and is discharged by bubbling, the motor 4 rotates to drive the transmission shaft 8 to rotate, so that the scraping rod 7 is driven to move, and the lime slurry at the bottom of the drainage plate 61 is continuously and uniformly scraped at the bottom of the drainage plate 61 by the scraping rod 7; in a long-time working state, the lime slurry layer at the bottom of the drainage plate 61 is scaled, and the scraping rod 7 is contacted with the drainage plate 61 and moves along with the transmission shaft 8 to scrape the lime scale; lime slurry falls and is sprayed on the drainage plate 61 and flows along the arc-shaped outer surface of the drainage plate 61, a part of lime slurry passes through the through hole 62 and is gathered on the inner surface of the drainage plate 61, the scraping rod 7 is uniformly scraped and smeared on the inner surface of the drainage plate 61, and the flowing distance of the lime slurry is increased; the flow rate of the lime slurry flowing into the top ends of the through holes 62 is greater than the flow rate of the lime slurry flowing out of the bottom ends of the through holes 62, so that a small part of the lime slurry is stored in the through holes 62, supplied to the bottom ends of the through holes 62 to flow out and converged into a lime slurry liquid layer, the lime slurry flowing out of the bottom ends of the through holes 62 is ensured, and the coverage area of the lime slurry liquid layer is further increased; the scraping rod 7 drives the rolling brush 72 to move, the rolling brush 72 is attached to the bottom end of the drainage plate 61, and the rolling brush 72 is rubbed and rolled by the bottom end of the drainage plate 61 to uniformly and repeatedly paint the bottom end of the drainage plate 61; the rolling brush 72 rolls to be dipped and brushed away, and the calcium sulfate floc and the raw gas are washed and then dipped with dust impurities attached to the lime slurry liquid layer; the raw material gas flows to the flow guide plate 61 through the inner ring of the annular partition plate 63, the diameter of the inner ring of the annular partition plate 63 is smaller than that of the outer ring of the flow guide plate 61, when the raw material gas flows through the annular partition plate 63, an airflow channel is reduced, the flow speed of the raw material gas is increased in a short time, so that the raw material gas generates slight wind power and is uniformly bubbled out of each through hole 62; one part of the raw material gas contacts the annular partition plate 63 in the rising process, the water vapor in the raw material gas is liquefied when meeting cold, and the raw material gas with the water vapor removed is reacted with the lime slurry; the raw material gas enters the desulfurizing tower 1 and contacts the inner wall of the desulfurizing tower 1, impurities in the raw material gas are contaminated and adsorbed on the inner wall of the desulfurizing tower 1 or the annular partition plate 63, under the long-time working state of the desulfurizing tower 1, the temperature in the desulfurizing tower 1 is high, lime slurry scales on the inner wall of the desulfurizing tower 1 and the annular partition plate 63, and on one hand, the brush 82 on the cleaning rod 81 brushes dirt and dust on the inner wall of the desulfurizing tower 1 or the annular partition plate 63; on the other hand, the brush 82 on the cleaning rod 81 brushes away dirt and dust, so that the reaction efficiency of the desulfurizing tower 1 is increased; when the brush 82 cleans some thicker or harder solidified dirt, the semicircular brush 82 scrapes the thicker or harder solidified dirt; when the cleaning rod 81 moves, the feed gas in the desulfurizing tower 1 is slightly stirred, the moving speed of the feed gas is accelerated, the flow speed of the feed gas is increased in a short time, so that the feed gas generates slight wind power, and the speed of the feed gas passing through the inner ring of the ring-shaped diaphragm 63 is further accelerated; sulfur dioxide in the feed gas and a lime slurry liquid layer are subjected to catalytic reaction to form calcium sulfate floccules, the floccules generated after the lime slurry liquid reaction flow to the bottom of the desulfurizing tower 1 or drop to the bottom of the desulfurizing tower under the influence of gravity, flow into the circulating tower 2 along a pipeline, are conveyed to the falling sprayer 6 again through the treatment of the circulating tower 2 for desulfurization, and the recycling of the lime slurry liquid is increased; the reacted raw gas continuously rises through the through hole 62 until entering the demisting unit 5, and the demisting unit 5 is treated and then discharged through the exhaust part of the desulfurizing tower 1.
The front, the back, the left, the right, the upper and the lower are all based on figure 1 in the attached drawings of the specification, according to the standard of the observation angle of a person, the side of the device facing an observer is defined as the front, the left side of the observer is defined as the left, and the like.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A wet desulphurization system for feed gas for ammonia synthesis is characterized in that: comprises a desulfurizing tower (1), a circulating tower (2), an air cooler (3), a motor (4), a demisting unit (5) and a precipitation shower (6); the circulating tower (2) is arranged on one side of the desulfurizing tower (1), a liquid conveying pipe in the circulating tower (2) is communicated with a liquid inlet pipe in the falling and spraying device (6), and the liquid inlet pipe in the circulating tower (2) is communicated with the bottom of the desulfurizing tower (1); the demisting unit (5) is arranged at the top in the desulfurizing tower (1), the sprinkling device (6) is arranged in the desulfurizing tower (1), and the sprinkling device (6) is positioned below the demisting unit (5); the air cooler (3) is arranged on one side of the desulfurizing tower (1) adjacent to the circulating tower (2); the motor (4) is arranged at the bottom of the desulfurizing tower (1); the central position of the bottom of the desulfurizing tower (1) is rotatably connected with a transmission shaft (8), one end of the transmission shaft (8) is positioned in the desulfurizing tower (1), the other end of the transmission shaft (8) penetrates through the bottom of the desulfurizing tower (1) and is positioned outside the desulfurizing tower (1), and the transmission shaft (8) is fixedly connected with an output shaft in the motor (4); a group of drainage plates (61) are uniformly and fixedly connected in the desulfurizing tower (1), and each drainage plate (61) is positioned below the precipitation device (6); one end of the transmission shaft (8) positioned in the desulfurizing tower (1) is rotatably connected with a drainage plate (61) close to the precipitation device (6); a group of through holes (62) are uniformly formed in the drainage plate (61); the position symmetry that lies in drainage plate (61) bottom on transmission shaft (8) is installed and is scraped pole (7), and every scrapes pole (7) and drainage plate (61) bottom contact, realizes that transmission shaft (8) drive and scrape pole (7) and slightly cut a piece of rubbing drainage plate (61) bottom.
2. The wet desulphurization system for feed gas for ammonia synthesis according to claim 1, wherein: the cross sections of the drainage plate (61) and the scraping rod (7) are both in a semi-circular arc shape, the scraping rod (7) is made of rubber, and the drainage plate (61) is in a cover shape; the aperture of the through hole (62) at the top end of the drainage plate (61) is larger than the aperture at the bottom end of the drainage plate (61).
3. The wet desulphurization system for feed gas for ammonia synthesis according to claim 2, wherein: one scraping rod (7) of the adjacent scraping rods (7) is uniformly provided with a group of grooves (71), and a rolling brush (72) is rotatably connected in each groove (71) through a rotating shaft; the rolling brush (72) is attached to the bottom end of the drainage plate (61).
4. The wet desulphurization system for feed gas for ammonia synthesis according to claim 3, wherein: a group of annular partition plates (63) are uniformly and fixedly connected to the inner wall of the desulfurizing tower (1), and the annular partition plates (63) are inclined downwards; the top end of the annular partition plate (63) is fixedly connected with the bottom end of the drainage plate (61), and through holes (62) are formed in the contact positions of the drainage plate (61) and the annular partition plate (63), so that the lime slurry on the annular partition plate (63) flows downwards through the through holes (62); one end of the annular partition plate (63) far away from the inner wall of the desulfurizing tower (1) is positioned at the lower position inside the drainage plate (61); the interior of the annular partition plate (63) is hollow, and the interior of the annular partition plate (63) is communicated with the air cooler (3) through a pipeline.
5. The wet desulphurization system for feed gas for ammonia synthesis according to claim 4, wherein: cleaning rods (81) are symmetrically arranged between the adjacent drainage plates (61) on the transmission shaft (8); the cleaning rod (81) is fixedly connected with a hairbrush (82).
6. The wet desulphurization system for feed gas for ammonia synthesis according to claim 5, wherein: the section of the cleaning rod (81) consists of a straight line a, a straight line b and a straight line c, the straight line a is close to the annular partition plate (63), the straight line b is close to the inner wall of the desulfurizing tower (1), and the straight line c is close to the outer surface of the top end of the drainage plate (61), so that the hairbrush (82) on the cleaning rod (81) contacts with the annular partition plate (63), the inner wall of the desulfurizing tower (1) and the outer surface of the top end of the drainage plate (61); the cross section of the hairbrush (82) is semicircular.
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