CN107261780B - Bubbling absorption tower for wet flue gas desulfurization - Google Patents
Bubbling absorption tower for wet flue gas desulfurization Download PDFInfo
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- CN107261780B CN107261780B CN201710688430.0A CN201710688430A CN107261780B CN 107261780 B CN107261780 B CN 107261780B CN 201710688430 A CN201710688430 A CN 201710688430A CN 107261780 B CN107261780 B CN 107261780B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—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
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses a bubbling absorption tower for wet flue gas desulfurization, which adopts the technical scheme that the bubbling absorption tower comprises a tower body, a flue gas outlet arranged at the top of the tower body and a flue gas inlet arranged in the middle of the tower body, wherein an oxidation air port is arranged below the flue gas inlet of the tower body, a demister, a bubbling desulfurization area and a spraying desulfurization area are sequentially arranged in the tower body from top to bottom, a spraying circulation component for primary desulfurization of flue gas is arranged in the spraying desulfurization area, and a bubbling component for secondary desulfurization of the flue gas is arranged in the bubbling desulfurization area. The flue gas is pretreated by the spraying circulation component, so that the temperature and acid substances of the flue gas are reduced, the bubbling component is prevented from scaling, and the desulfurization effect of the bubbling absorption tower is improved.
Description
Technical Field
The invention relates to the technical field of flue gas desulfurization, in particular to a bubbling absorption tower for wet flue gas desulfurization.
Background
At present, the main forms of devices for removing sulfur dioxide in flue gas by a wet method are as follows: the device comprises an empty tower spray, tower plates, a packed tower, a bubble tower and the like, wherein the empty tower spray is simple in structure, the pH value of the used spray slurry is low, scaling is not easy to generate, but the desulfurization efficiency of the device is low;
the bubble tower has the advantages of high flow rate of the perforated gas, sufficient gas-liquid contact and high desulfurization efficiency. However, the application of the bubble column cannot be popularized and applied in a large range, and the following defects mainly exist: 1. when the bubble tower is used as a desulfurization device, unsaturated hot flue gas passes through the bubble holes to contact with desulfurization slurry, a dry-wet interface is easily formed to block the bubble pipe, so that the system cannot normally operate, and the shutdown rate of the desulfurization device of the bubble tower is high; 2. the bubbling pipe has higher requirement on the concentration of the delayed dust, the higher dust can be gradually adhered to the inner side of the bubbling pipe after entering from the bubbling pipe, the flow area of the flue gas is gradually reduced along with the increase of the operation time of the system, the resistance of the desulfurization device is rapidly increased, and larger potential safety hazards are caused to a fan and a boiler; 3. the bubble tower is different from a spray tower, the reaction zone of the bubble tower is in a bubble layer, and the pH value of slurry in the bubble layer area is rapidly reduced after acid flue gas reacts with desulfurizer slurry in the bubble layer, so that the desulfurization efficiency of the bubble layer cannot be continuously and stably, and therefore the bubble tower has a certain improvement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the bubbling absorption tower for wet flue gas desulfurization, which has the characteristics of avoiding the scaling of a bubbling assembly to a certain extent and improving the desulfurization efficiency of the bubbling absorption tower.
The technical purpose of the invention is realized by the following technical scheme:
the utility model provides a wet flue gas desulfurization's tympanic bulla absorption tower, includes the tower body, locates the exhanst gas outlet at tower body top and locate the flue gas import at tower body middle part, the tower body is equipped with the oxidation wind gap in the below of flue gas import, be equipped with defroster, tympanic bulla desulfurization district in the tower body from top to bottom in proper order and spray the desulfurization district, be provided with in the desulfurization district that sprays and be used for carrying out the circulation subassembly that sprays of first desulfurization to the flue gas, be provided with in the tympanic bulla desulfurization district and be used for carrying out the tympanic bulla subassembly of secondary.
Through the technical scheme, the flue gas with sulfur dioxide is introduced into the tower body from the flue gas inlet and moves upwards along the tower body from bottom to top, the corresponding external air enters from the oxidation air port and is mixed with the flue gas, at the moment, the spraying circulation assembly is started, the desulfurizer sprayed down in the spraying circulation assembly is mixed with the flue gas in an opposite flushing mode to react with the sulfur dioxide in the flue gas for pretreatment, and the flue gas enters the bubbling desulfurization area;
the desulfurizer sprayed by the spraying circulation component can precipitate dust in the flue gas, and the dust in the flue gas can be prevented from rushing into the bubbling component and adhering to the bubbling component to cause scaling of the bubbling component; and the desulfurizer sprayed by the spraying circulation component can cool the flue gas and then enter the bubbling desulfurization area.
Preferably, the bubbling assembly comprises a partition plate and a bubbling tank which is arranged on the partition plate and has an opening facing the demister, the bubbling tank is internally provided with the desulfurization slurry with first concentration, the partition plate is provided with a vent communicated with the spray desulfurization area, the vent is communicated with a bubbling pipe, and the other end of the bubbling pipe is bent and extends into the desulfurization slurry with first concentration in the bubbling tank.
Through the technical scheme, the flue gas enters the bubbling pipe through the vent after passing through the spray circulation component in the spray desulfurization area, the flue gas enters the bubbling tank with the desulfurization slurry with the first concentration through the bubbling pipe for bubbling desulfurization, and the flue gas after bubbling desulfurization is discharged from a flue gas outlet at the top of the tower body through the demister; wherein, the dust in the flue gas enters into the bubbling pipe again after spraying the precipitation in desulfurization region, can avoid the dust adhesion in the flue gas on the pipe wall of bubbling pipe, causes the bubbling pipe scale deposit and makes flue gas flow area reduce gradually to avoid because the unhindered potential safety hazard that causes this bubbling absorption tower circulation stagnation and bring of bubbling pipe.
Preferably, the opening of the bubbling tank is connected with a receiving plate, and the receiving plate is in a horn shape and extends to the edge of the demister.
Through above-mentioned technical scheme, the flue gas is discharged from the opening discharge in bubbling pond behind the bubbling pond, because the flue gas will take a large amount of first concentration desulfurization thick liquids through the bubbling, through the setting of accepting the board, can accept the first concentration desulfurization thick liquids that drip on the defroster and flow back to in the bubbling pond to avoid the loss that first concentration breaks away from the thick liquids.
Preferably, the opening part of the bubbling tube is provided with a rectifying plate, and the rectifying plate is provided with a plurality of air flow passing holes.
Through above-mentioned technical scheme, seted up a plurality of air currents on the cowling panel and passed the hole, flue gas after depositing through the dust passes the hole through the air current and can avoid the air current to pass the hole and block up, wherein, when the opening discharge of flue gas from the bubbling pipe, pass the hole through the air current and separate the flue gas at bubbling pipe opening formation large bubble and be a plurality of small bubbles, from this, increased the area of contact of flue gas and first concentration desulfurization thick liquid to effectively improve the secondary desulfurization effect to the flue gas.
Preferably, the spray circulation subassembly includes a plurality of showers and a plurality of spray pumps, and a plurality of showers are located flue gas inlet's top and from last to horizontal in the tower body down, install the shower head on the shower, the bottom of tower body is equipped with the thick liquid pond, be equipped with the desulfurization thick liquid of second concentration in the thick liquid pond, the thick liquid circulation mouth has been seted up on the thick liquid pond, be connected with circulating line on the thick liquid circulation mouth, the input of a plurality of spray pumps is connected respectively in circulating line, and the output of a plurality of spray pumps communicates with each other with the shower that corresponds respectively.
Through above-mentioned technical scheme, the spray pump can follow the second concentration desulfurization thick liquid that absorbs in the thick liquid pond in the thick liquid circulation mouth and impress in the shower, spray downwards through the shower head and go out, in order to form the offset with the flue gas that rises, with effectively deposit the dust in the flue gas, reduce the temperature of flue gas, and flow into the thick liquid pond again after carrying out oxidation reaction with the sulfur dioxide in the flue gas in, the second concentration desulfurization thick liquid recycles and contacts with the flue gas, the absorption utilization ratio of second concentration desulfurization thick liquid is high, it can be greater than 95% to break away from efficiency.
Preferably, the tower body is equipped with the drainage plate of downward sloping with the opposite side of flue gas import in spraying the desulfurization district, be connected with the division board between the bottom of drainage plate and tower body, the division board is separated into thick liquid chamber and crystallization chamber with the thick liquid pond, the overflow mouth has been seted up on the division board, thick liquid circulation mouth communicates with each other with the thick liquid chamber.
Through above-mentioned technical scheme, after the sulfur dioxide in second concentration desulfurization thick liquid and the flue gas mixes, the drainage through the drainage plate drips in the crystallization chamber, and the crystallization chamber is arranged in the deposit, the crystallization is appeared the product behind second concentration desulfurization thick liquid and the sulfur dioxide oxidation reaction, through the setting of overflow mouth, can avoid this product to enter into the thick liquid chamber to make the second concentration desulfurization thick liquid on upper strata can circulate continuously and enter into the thick liquid chamber through the overflow mouth.
Preferably, the drainage plate downwardly extends in the crystallization cavity to form a vertical plate, and a convection port is reserved between the vertical plate and the bottom of the tower body.
Through above-mentioned technical scheme, it has the convection current mouth to reserve between riser and the tower body bottom, and riser and division board will form stable region in the crystallization chamber, and the second concentration desulfurization thick liquid in the stable region flows more gently to reduce the sulfur dioxide oxidation product that enters into in the thick liquid chamber in the desulfurization thick liquid of second concentration, in order to further improve the absorption utilization of the desulfurization thick liquid of second concentration.
Preferably, the tower body is connected with a first gypsum pump communicated with the crystallization cavity and a second gypsum pump communicated with the bubbling tank, and the output ends of the first gypsum pump and the second gypsum pump are connected with a gypsum conveying pipeline.
Through above-mentioned technical scheme, will crystallize when the sulfur dioxide oxidation product concentration in crystallization chamber, the tympanic bulla pond is too high and separate out, can separate out the crystallization in crystallization chamber and the tympanic bulla pond through first gypsum pump and second gypsum pump and carry out recycle.
Preferably, be connected with the pH meter on the tower body, the pH meter has first detecting electrode, second detecting electrode and third detecting electrode, first detecting electrode sets up on the output of spraying the pump, the second detecting electrode sets up on the blow vent, the third detecting electrode sets up on the defroster.
Through the technical scheme, the first detection electrode, the second detection electrode and the third detection electrode respectively detect the pH value of the desulfurization slurry with the second concentration circularly entering the tower body, the pH value of the desulfurization slurry with the second concentration after oxidation reaction and the pH value of the desulfurization slurry with the first concentration after oxidation reaction, so that the desulfurization slurry with the first concentration can be timely replaced when the pH value is too small.
Preferably, the pH value of the first-concentration desulfurized slurry is 6.0-6.5, and the pH value of the second-concentration desulfurized slurry is 5.5-5.6.
Through above-mentioned technical scheme, the higher first concentration of pH value breaks away from thick liquid desulfurization efficiency and is higher but take place the scale deposit phenomenon more easily, and wherein, the absorption efficiency of the first concentration desulfurization thick liquid of pH value between 6.0 ~ 6.5 is higher, and when the second concentration desulfurization thick liquid of pH value between 5.5 ~ 5.6 sprays, when the flue gas that the upper punch has the second concentration desulfurization thick liquid enters into the bubbling pipe, can avoid taking place the scale deposit phenomenon with the blow vent that the bubbling pipe is continuous.
In summary, compared with the prior art, the beneficial effects of the invention are as follows:
the flue gas is pretreated by the spraying circulation component, so that the temperature and acid substances of the flue gas are reduced, the bubbling component is prevented from scaling, and the desulfurization effect of the bubbling absorption tower is improved.
Drawings
FIG. 1 is a system block diagram of an embodiment;
fig. 2 is a schematic structural view of a tower body in an embodiment;
fig. 3 is a schematic structural diagram of a rectifying plate.
Reference numerals: 1. a tower body; 2. a flue gas outlet; 3. a flue gas inlet; 4. a smoke-cleaning duct; 5. a chimney; 6. a smoke-cleaning baffle door; 7. a raw tobacco pipe; 8. an induced draft fan; 9. a raw smoke damper door; 10. a bypass conduit; 11. a bypass flapper door; 12. an oxidizing tuyere; 13. an air duct; 14. an aeration fan; 15. a demister; 16. a bubbling assembly; 161. a partition plate; 162. a bubbling tank; 163. a vent; 164. a bubbling tube; 165. a rectifying plate; 166. an air flow through the aperture; 167. a bearing plate; 168. folding the plate; 169. a baffle; 17. a spray circulation assembly; 171. a shower pipe; 172. a spray pump; 173. a shower head; 18. a slurry tank; 181. a slurry chamber; 182. a crystallization cavity; 19. a slurry circulation port; 20. a circulation pipe; 21. a first valve; 22. a liquid storage tank; 23. a second valve; 24. a drainage plate; 25. a separator plate; 26. an overflow port; 27. a vertical plate; 28. a convection port; 29. a first gypsum pump; 30. a second gypsum pump; 31. a gypsum delivery pipe; 32. a first solenoid valve; 33. a second solenoid valve; 34. a make-up pump; 35. a third electromagnetic valve; 36. a pH meter; 361. a first detection electrode; 362. a second detection electrode; 363. and a third detection electrode.
Detailed Description
The invention is described in further detail below with reference to fig. 1, 2 and 3.
Referring to fig. 1 and 2, a bubbling absorption tower for wet flue gas desulfurization comprises a tower body 1, a flue gas outlet 2 arranged at the top of the tower body 1, and a flue gas inlet 3 arranged at the middle part of the tower body 1, wherein a clean flue gas pipeline 4 is connected to the flue gas outlet 2, the clean flue gas pipeline 4 is connected to a chimney 5, and a clean flue gas baffle door 6 is arranged on the clean flue gas pipeline 4.
The flue gas inlet 3 is connected with a raw flue gas pipeline 7, the raw flue gas pipeline 7 is connected with an induced draft fan 8, a raw flue gas baffle door 9 is arranged on the raw flue gas pipeline 7, and the induced draft fan 8 is used for introducing waste flue gas into the tower body 1 from the flue gas inlet 3. It is worth mentioning that a bypass duct 10 is further connected between the clean smoke duct 4 and the raw smoke duct 7, a bypass damper 11 is connected to the bypass duct 10, and the bypass duct 10 is arranged through the bypass damper 11 for introducing clean smoke into the raw smoke duct 7 for re-entering the tower 1. An oxidation air port 12 is arranged below the flue gas inlet 3 of the tower body 1, an air pipeline 13 is connected to the oxidation air port 12, an aeration fan 14 is connected to the air pipeline 13, and the aeration fan 14 is used for introducing outside air into the tower body 1 to provide oxygen necessary for oxidation reaction.
Be equipped with defroster 15, tympanic bulla desulfurization district and spray the desulfurization district from top to bottom in proper order in the tower body 1, be provided with in the desulfurization district and be used for carrying out the first desulfurization to the flue gas spray circulation subassembly 17, be provided with in the tympanic bulla desulfurization district and be used for carrying out the tympanic bulla subassembly 16 of secondary desulfurization to the flue gas.
The bubbling assembly 16 includes a partition plate 161 and a bubbling tank 162 disposed on the partition plate 161 and having an opening facing the demister 15, and the bubbling tank 162 is provided with the first-concentration desulfurization slurry, in this embodiment, the first-concentration desulfurization slurry is a calcium carbonate solution, and since the flue gas contains sulfur dioxide substances, calcium carbonate and sulfur dioxide undergo an oxidation reaction to generate calcium sulfate, and it is worth mentioning that the pH value of the first-concentration desulfurization slurry is between 6.0 and 6.5.
The partition plate 161 is provided with a vent 163 communicated with the spray desulfurization area, the vent 163 is communicated with a bubbling tube 164, the other end of the bubbling tube 164 is bent, the bent end of the bubbling tube 164 extends into the first-concentration desulfurization slurry from the opening of the bubbling tank 162, the opening of the bubbling tube 164 is provided with a rectifying plate 165, and the rectifying plate 165 is provided with a plurality of air flow passing holes 166, as shown in fig. 3. Wherein, be connected with at the opening part of tympanic bulla pond 162 and accept the board 167, accept the board 167 and be the edge that the horn shape extends to defroster 15 to be provided with the drawing board 168 between defroster 15 and tower body 1 top, drawing board 168 extends to the edge of defroster 15 from tower body 1 top, in order to gather together the flue gas after the purification in flue gas outlet 2.
Wherein, the lower surface of the partition plate 161 is connected with a guide plate 169, the guide plate 169 is in a ridge shape, and the guide plate 169 is used for guiding the flue gas rising from the spray desulfurization area to the air vent 163.
Referring to fig. 1 and 2, the spray circulation assembly 17 includes a plurality of spray pipes 171 and a plurality of spray pumps 172, the plurality of spray pipes 171 are located above the flue gas inlet 3 and are horizontally disposed in the tower body 1 from top to bottom, and two adjacent layers of spray pipes 171 are alternately disposed at intervals. Wherein, each shower 171 is provided with a plurality of spray heads 173 for atomization, the bottom of the tower body 1 is provided with a slurry pool 18, and the slurry pool 18 is provided with a desulfurization slurry with a second concentration, in this embodiment, the desulfurization slurry with the second concentration is a calcium carbonate solution, and it is worth explaining that the pH value of the desulfurization slurry with the second concentration is between 5.5 and 5.6.
The slurry tank 18 is provided with a slurry circulation port 19, the slurry circulation port 19 is connected with a circulation pipeline 20, the input ends of a plurality of spray pumps 172 are respectively connected with the circulation pipeline 20, and the output ends of the plurality of spray pumps 172 are respectively communicated with corresponding spray pipes 171.
It is noted that a first valve 21 is installed at the head end of the circulation pipe 20, and the tail end of the circulation pipe 20 is connected to the tank 22 through a pipe, wherein a second valve 23 is installed at the tail end of the circulation pipe 20.
The tower body 1 is provided with a downward-inclined flow guide plate 24 at the opposite side of the flue gas inlet 3 in the spray desulfurization area, a separation plate 25 is connected between the flow guide plate 24 and the bottom of the tower body 1, the separation plate 25 is positioned at the middle position of the flow guide plate 24, the slurry pool 18 is separated into a slurry cavity 181 and a crystallization cavity 182 by the separation plate 25, an overflow port 26 is arranged on the separation plate 25, and the slurry circulation port 19 is communicated with the slurry cavity 181. The vertical plate 27 extends downwards in the crystallization cavity 182 of the drainage plate 24, the convection port 28 is reserved between the vertical plate 27 and the bottom of the tower body 1, and it is worth explaining that the connection point of the drainage plate 24 and the vertical plate 27 is flush with the horizontal position between the overflow ports 26 so as to ensure that the second-concentration desulfurization slurry neutralized by the flue gas is more stable when flowing into the crystallization cavity 182 through the drainage plate 24, and the dripping phenomenon can not be generated, thereby causing the second-concentration desulfurization slurry in the crystallization cavity 182 to shake.
In this embodiment, the tower body 1 is connected with a first gypsum pump 29 communicated with the crystallization cavity 182 and a second gypsum pump 30 communicated with the bubbling tank 162, an output end of the first gypsum pump 29 is connected with a gypsum conveying pipeline 31, an output end connected with the second gypsum pump 30 is connected with the gypsum conveying pipeline 31, a pipeline communicated between the first gypsum pump 29 and the crystallization cavity 182 is provided with a first electromagnetic valve 32, a pipeline communicated between the second gypsum pump 30 and the bubbling tank 162 is provided with a second electromagnetic valve 33, and the bubbling tank 162 is further connected with a supplementary pump 34 through a third electromagnetic valve 35.
The tower body 1 is further connected with a pH meter 36, the pH meter 36 has a first detection electrode 361, a second detection electrode 362 and a third detection electrode 363, the first detection electrode 361 is arranged on the output end of the spray pump 172, the second detection electrode 362 is arranged on the vent 163, and the third detection electrode 363 is arranged on the demister 15. The first detection electrode 361, the second detection electrode 362 and the third detection electrode 363 respectively detect the pH value of the desulfurization slurry of the second concentration circulated into the tower body 1, the pH value of the desulfurization slurry of the second concentration after the oxidation reaction, and the pH value of the desulfurization slurry of the first concentration after the oxidation reaction.
Therefore, when the pH value of the first-concentration desulfurization slurry in the bubbling tank 162 is too large and tends to be neutral, the second electromagnetic valve 33 is controlled to be opened, and the second gypsum pump 30 is started to suck the first-concentration desulfurization slurry in the bubbling tank 162 into the gypsum conveying pipeline 31 for collecting and reusing gypsum; after the first concentration of the desulfurization slurry in the bubbling tank 162 is completely sucked, the replenishment pump 34 is started by controlling the third electromagnetic valve 35 to be opened, and the replenishment pump 34 is used for replenishing the first concentration of the desulfurization slurry in the bubbling tank 162.
When the pH value of the second-concentration desulfurization slurry in the slurry tank 18 is too high and tends to be neutral, the first electromagnetic valve 32 and the first valve 21 are controlled to be opened, the second valve 23 is closed, and the spray pump 172 and the first gypsum pump 29 are started so as to suck the second-concentration desulfurization slurry in the slurry tank 18 into the gypsum conveying pipeline 31 for collecting and recycling gypsum; after the second-concentration desulfurization slurry in the slurry tank 18 is completely sucked, the first valve 21 is controlled to be closed, the second valve 23 is controlled to be opened, and the spray pump 172 is started to replenish the second-concentration desulfurization slurry in the liquid storage tank 22 into the slurry tank 18.
The working process of the bubbling absorption tower comprises the following steps:
the flue gas with sulfur dioxide is introduced into the tower body 1 from the flue gas inlet 3 and moves upwards along the tower body 1 from bottom to top, the corresponding external air enters from the oxidation air inlet 12 and is mixed with the flue gas, at the moment, the spraying circulation component 17 is started, the second-concentration desulfurization slurry sprayed down in the spraying circulation component 17 is flushed with the flue gas, and the sulfur dioxide in the flue gas is oxidized to generate calcium sulfate solution in the crystallization cavity 182 of the slurry pool 18.
The pretreated flue gas enters the bubbling tank 162 from the bubbling pipe 164 through the vent 163, the pretreated flue gas is subjected to secondary desulfurization in the bubbling tank 162, a calcium sulfate solution is correspondingly generated in the bubbling tank 162, and the flue gas subjected to secondary desulfurization enters the flue gas outlet 2 through the demister 15 and is discharged.
After calcium sulfate in the crystallization cavity 182 and the bubbling tank 162 reaches a certain saturation degree, crystallization is carried out to form dihydrate gypsum, and after the dihydrate gypsum is sucked and discharged by the first gypsum pump 29 and the second gypsum pump 30, gypsum slurry can be concentrated and dehydrated to ensure that the water content of the gypsum slurry is less than 10%, so that a gypsum storage bin is formed for stacking.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.
Claims (4)
1. A bubbling absorption tower for wet flue gas desulfurization comprises a tower body (1), a flue gas outlet (2) arranged at the top of the tower body (1) and a flue gas inlet (3) arranged at the middle part of the tower body (1), wherein an oxidation air port (12) is arranged below the flue gas inlet (3) of the tower body (1), and the bubbling absorption tower is characterized in that a smoke purifying pipeline (4) is connected to the flue gas outlet (2), the smoke purifying pipeline (4) is connected to a chimney (5), a smoke purifying baffle door (6) is arranged on the smoke purifying pipeline (4), a raw smoke pipeline (7) is connected to the flue gas inlet (3), an induced draft fan (8) is connected to the raw smoke pipeline (7), a raw smoke baffle door (9) is arranged on the raw smoke pipeline (7), and the induced draft fan (8) is used for introducing waste flue gas into the tower body (1) from;
a bypass pipeline (10) is further connected between the clean smoke pipeline (4) and the raw smoke pipeline (7), a bypass baffle door (11) is connected to the bypass pipeline (10), and the bypass pipeline (10) is used for introducing clean smoke into the raw smoke pipeline (7) through the arrangement of the bypass baffle door (11) to enter the tower body (1) again;
a demister (15), a bubbling desulfurization zone and a spraying desulfurization zone are sequentially arranged in the tower body (1) from top to bottom, a spraying circulation component (17) for primary desulfurization of flue gas is arranged in the spraying desulfurization zone, and a bubbling component (16) for secondary desulfurization of the flue gas is arranged in the bubbling desulfurization zone;
the bubbling assembly (16) comprises a partition plate (161) and a bubbling tank (162) which is arranged on the partition plate (161) and has an opening facing the demister (15), first-concentration desulfurization slurry is arranged in the bubbling tank (162), an air port (163) communicated with the spraying desulfurization zone is formed in the partition plate (161), a bubbling pipe (164) is communicated with the air port (163), and the other end of the bubbling pipe (164) is bent to extend into the first-concentration desulfurization slurry in the bubbling tank (162);
the spray circulation assembly (17) comprises a plurality of spray pipes (171) and a plurality of spray pumps (172), wherein the plurality of spray pipes (171) are positioned above the flue gas inlet (3) and are transversely arranged in the tower body (1) from top to bottom, the spray heads (173) are installed on the spray pipes (171), a slurry pool (18) is arranged at the bottom of the tower body (1), second-concentration desulfurization slurry is arranged in the slurry pool (18), a slurry circulation port (19) is formed in the slurry pool (18), a circulation pipeline (20) is connected to the slurry circulation port (19), the input ends of the plurality of spray pumps (172) are respectively connected to the circulation pipeline (20), the output ends of the plurality of spray pumps (172) are respectively communicated with the corresponding spray pipes (171), a first valve (21) is installed at the head end of the circulation pipeline (20), and the tail end of the circulation pipeline (20) is connected to a liquid storage tank (22) through a pipeline, a second valve (23) is arranged at the tail end of the circulating pipeline (20);
a downward-inclined drainage plate (24) is arranged on the tower body (1) in a spraying desulfurization area and on the side opposite to the flue gas inlet (3), a separation plate (25) is connected between the drainage plate (24) and the bottom of the tower body (1), a slurry pool (18) is separated into a slurry cavity (181) and a crystallization cavity (182) by the separation plate (25), an overflow port (26) is formed in the separation plate (25), and the slurry circulation port (19) is communicated with the slurry cavity (181); a vertical plate (27) extends downwards in the crystallization cavity (182) of the drainage plate (24), and a convection port (28) is reserved between the vertical plate (27) and the bottom of the tower body (1);
the tower body (1) is connected with a first gypsum pump (29) communicated with the crystallization cavity (182) and a second gypsum pump (30) communicated with the bubbling tank (162), the output ends of the first gypsum pump (29) and the second gypsum pump (30) are connected with a gypsum conveying pipeline (31), a first electromagnetic valve (32) is installed on a pipeline communicated between the first gypsum pump (29) and the crystallization cavity (182), a second electromagnetic valve (33) is installed on a pipeline communicated between the second gypsum pump (30) and the bubbling tank (162), and the bubbling tank (162) is further connected with a supplementary pump (34) through a third electromagnetic valve (35);
be connected with pH meter (36) on tower body (1), pH meter (36) have first detecting electrode (361), second detecting electrode (362) and third detecting electrode (363), first detecting electrode (361) set up on the output of spray pump (172), second detecting electrode (362) set up on air vent (163), third detecting electrode (363) set up on defroster (15).
2. The bubble absorption tower for wet flue gas desulfurization according to claim 1, wherein an opening of the bubble tank (162) is connected with a receiving plate (167), and the receiving plate (167) extends to the edge of the demister (15) in a trumpet shape.
3. The bubble absorption tower for wet flue gas desulfurization according to claim 1, wherein a rectifying plate (165) is installed at the opening of the bubbling tube (164), and a plurality of gas flow passing holes (166) are formed in the rectifying plate (165).
4. The bubble absorption tower for wet flue gas desulfurization according to claim 1, wherein the first concentration of desulfurization slurry has a pH value of 6.0 to 6.5, and the second concentration of desulfurization slurry has a pH value of 5.5 to 5.6.
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| CN201710688430.0A CN107261780B (en) | 2017-08-12 | 2017-08-12 | Bubbling absorption tower for wet flue gas desulfurization |
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| CN111252839A (en) * | 2020-01-18 | 2020-06-09 | 河北荣特化工股份有限公司 | Novel process for treating hydrogenation type waste water and waste gas |
| CN112999839A (en) * | 2021-03-26 | 2021-06-22 | 四川利弘陶瓷有限公司 | Flue gas desulfurization system of drying tower kiln |
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