CN112717678A - Industrial furnace dry desulphurization device and desulphurization method - Google Patents
Industrial furnace dry desulphurization device and desulphurization method Download PDFInfo
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- CN112717678A CN112717678A CN202011546907.XA CN202011546907A CN112717678A CN 112717678 A CN112717678 A CN 112717678A CN 202011546907 A CN202011546907 A CN 202011546907A CN 112717678 A CN112717678 A CN 112717678A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 120
- 230000023556 desulfurization Effects 0.000 claims abstract description 120
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 35
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 35
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 35
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 35
- 238000005192 partition Methods 0.000 claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 78
- 239000003546 flue gas Substances 0.000 claims description 78
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000002956 ash Substances 0.000 description 33
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 23
- 239000007789 gas Substances 0.000 description 8
- 238000006386 neutralization reaction Methods 0.000 description 7
- 230000003009 desulfurizing effect Effects 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 239000010882 bottom ash Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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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)
- Treating Waste Gases (AREA)
Abstract
The invention provides an industrial furnace dry desulphurization device and a desulphurization method, wherein the industrial furnace dry desulphurization device comprises a dry desulphurization tower, an inlet flue and an outlet flue, the dry desulphurization tower is divided into a left desulphurization chamber and a right desulphurization chamber by a vertically arranged partition plate, the bottoms of the left desulphurization chamber and the right desulphurization chamber are communicated, a first ash bucket is arranged at the bottom of the dry desulphurization tower, a compressed air interface is arranged at the lower part of the first ash bucket, and a star-shaped discharge valve is arranged at an ash discharge port at the bottom of the first ash bucket; the right desulfurization chamber top is communicated with an inlet flue through a venturi, a slaked lime interface is arranged at a venturi throat, a steam interface is arranged on the inlet flue, and the left desulfurization chamber top is communicated with an outlet flue. The dry desulfurization device for the industrial furnace has the advantages of compact structure, low investment, easy operation and high desulfurization efficiency.
Description
Technical Field
The invention relates to a flue gas desulfurization technology, in particular to a dry desulfurization device and a dry desulfurization method for an industrial furnace.
Background
The development of flue gas desulfurization has become a mature and stable technology in the last 30 years, and various types of flue gas desulfurization devices have been widely applied to industrial furnaces and coal-fired power plants in various countries in the world. Flue gas desulfurization technology is an important means for controlling sulfur dioxide and acid rain. The method is divided into three types according to the states of the absorbent and the desulfurization product: wet desulfurization, semi-dry desulfurization and dry desulfurization. Compared with wet desulphurization, the dry desulphurization technology has the advantages of simple process, no problem of sewage and waste acid treatment, low energy consumption, no need of secondary heating for purified flue gas and low corrosivity; its disadvantages are low desulfurizing efficiency, not good as wet desulfurizing, large equipment size, large investment, large occupied area and high requirement for operation technique.
Disclosure of Invention
The invention aims to provide an industrial furnace dry-method desulfurization device which has the advantages of compact structure, low investment, easiness in operation and high desulfurization efficiency, and aims to solve the problems of large dry-method desulfurization equipment, high investment, large occupied area, high operation technical requirement and low desulfurization efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: a dry desulfurization device for an industrial furnace comprises a dry desulfurization tower, an inlet flue and an outlet flue, wherein the dry desulfurization tower is divided into a left desulfurization chamber and a right desulfurization chamber by a vertically arranged partition plate, the bottoms of the left desulfurization chamber and the right desulfurization chamber are communicated, a first ash hopper is arranged at the bottom of the dry desulfurization tower, a compressed air interface is arranged at the lower part of the first ash hopper, and a star-shaped discharge valve is arranged at an ash discharge port at the bottom of the first ash hopper; the inlet flue is communicated with the top of the right desulfurization chamber through a venturi, a slaked lime interface is arranged at the throat of the venturi, a steam interface is arranged on the inlet flue, and the top of the left desulfurization chamber is communicated with the outlet flue.
Furthermore, the venturi is a venturi contraction pipe and is positioned at a flue gas inlet section of the dry desulfurization tower, a slaked lime interface is arranged at a throat of the venturi, flue gas required to be desulfurized in the industrial furnace is led into the venturi through an inlet flue, and the slaked lime and the flue gas are fully mixed through the zooming effect of the venturi, so that acidic sulfur dioxide gas in the flue gas fully performs a neutralization reaction with alkaline slaked lime powder to achieve the purpose of primary desulfurization.
Furthermore, an inertia louver type mixer is arranged at the middle upper part of the right desulfurization chamber. The inertia louver type mixer is welded to the front wall and the rear wall of the right desulfurization chamber by angle steel respectively, 3-4 rows of angle steel are arranged longitudinally (along the flow direction of flue gas) and two rows of angle steel are arranged transversely (perpendicular to the flow direction of the flue gas) in a staggered manner, the arrangement of the inertia louver type mixer increases the mixing and the stroke of the flue gas in the dry desulfurization tower, increases the reaction time of the flue gas and slaked lime in the dry desulfurization tower, and ensures that acidic sulfur dioxide gas in the flue gas fully performs a neutralization reaction with alkaline slaked lime powder so as to achieve the purpose of secondary desulfurization.
Furthermore, the left desulfurization chamber is communicated with the bottom of the right desulfurization chamber through a first ash hopper, the first ash hopper is of a conical structure (in a necking form), two star-shaped discharge valves are arranged at an ash discharge port at the bottom of the first ash hopper in series, and the airtightness of the dry desulfurization tower can be ensured by the staggered operation of the two star-shaped discharge valves. The sulfate generated by the reaction can be discharged out of the dry-method desulfurizing tower at regular time through a star-shaped discharge valve. When the flue gas passes through the first ash falling hopper, the direction of the flue gas changes 180 degrees and enters the left desulfurization chamber, and the flue gas continues to react with sulfur dioxide in the flue gas in the left desulfurization chamber.
Furthermore, the lower edge of the partition board in the dry desulfurization tower extends into the position of 1/2-1/3, and the whole dry desulfurization tower forms a larger Venturi type through the partition board in the dry desulfurization tower, so that the acid sulfur dioxide gas in the flue gas is fully subjected to neutralization reaction with the alkaline slaked lime powder to achieve the purpose of three-level desulfurization. Meanwhile, the whole dry desulfurization tower forms a U-shaped structure through the mode of the built-in partition plate of the dry desulfurization tower, so that the retention time of the flue gas in the dry desulfurization tower is prolonged, the volume of the dry desulfurization tower is effectively reduced, and meanwhile, sufficient neutralization reaction time is provided for dry desulfurization.
Furthermore, a second ash hopper is arranged at the bottom of the outlet flue, a star-shaped discharge valve is arranged at an ash discharge port of the second ash hopper, and a flue gas outlet is formed in the side face of the lower portion of the outlet flue.
Furthermore, the steam interface is a low-pressure steam interface, and the low-pressure steam sprayed into the inlet flue from the low-pressure steam interface can be mixed with the flue gas to increase the moisture content of the flue gas due to SO2Gas easily reacts with H2Formation of H from O gas2SO3And the oxygen content in the dry flue gas is generally not lower than 6 percent, and the oxygen in the flue gas also converts H into oxygen2SO3Further oxidation to H2SO4And strong acid is formed, so that conditions are provided for the subsequent acid-base neutralization reaction, and the desulfurization efficiency is improved.
Further, the slaked lime joint is arranged separately from the steam joint, and the steam joint is positioned on the flue before the slaked lime joint. The reason that the same interface is not adopted for spraying is to prevent that the slaked lime powder which just enters the flue is not scattered and is bonded into a cluster due to the higher humidity of the steam when the steam and the slaked lime enter the flue together, so that the full contact between the slaked lime and the flue gas is influenced, and the desulfurization efficiency is lowered.
The invention also provides a dry desulfurization method for the industrial furnaceThe method comprises the following steps: when the flue gas and the steam are mixed to reach a certain moisture content (the activity of the slaked lime is enhanced when the relative humidity is 40-50 percent), SO can be absorbed very effectively2) Further mixing with slaked lime in a Venturi tube and accelerating to enter a right desulfurization chamber of the desulfurization tower, and allowing flue gas to run from top to bottom; the flue gas enters the left desulfurization chamber from the right desulfurization chamber through the bottom ash hopper, the flue gas runs from bottom to top, and the flue gas is discharged after undergoing a desulfurization reaction in the desulfurization tower and enters a subsequent process (such as a bag-type dust collector).
The industrial furnace dry desulphurization device has simple and compact structure, and the industrial furnace dry desulphurization method is scientific and reasonable, and compared with the prior art, the device has the following advantages:
1) the low-pressure steam interface is arranged on the inlet flue, and the low-pressure steam sprayed from the low-pressure steam interface is mixed with the flue gas to increase the moisture content of the flue gas and greatly improve the efficiency of dry desulfurization. The steam is adopted instead of water spraying, so that the flue gas is prevented from being cooled greatly due to the water spraying, the phenomenon that the flue gas is stuck in a bag after entering the bag-type dust remover is caused, and the temperature is not reduced greatly, so that the heating cost in flue gas denitration is increased.
2) The flue gas inlet of the desulfurizing tower adopts a Venturi, and a slaked lime spraying interface is arranged at the throat of the Venturi. The flue gas to be desulfurized of the industrial furnace is led into the Venturi through the inlet flue, and the slaked lime and the flue gas are fully mixed through the contraction and enlargement effect of the Venturi, so that the acidic sulfur dioxide gas in the flue gas fully performs a neutralization reaction with the alkaline slaked lime powder to achieve the purpose of primary desulfurization.
3) The dry desulfurization tower is divided into a left chamber and a right chamber, the flue gas to be treated enters from the right desulfurization chamber of the dry desulfurization tower, and the inertia shutter type mixer arranged at the middle upper part of the right desulfurization chamber can enhance the mixing of the flue gas and the slaked lime, prolong the reaction time of the flue gas and the slaked lime in the desulfurization tower and improve the desulfurization efficiency;
4) the bottoms of the left desulfurization chamber and the right desulfurization chamber of the dry desulfurization tower are in a conical ash bucket structure, the communicated part of the bottoms is in a necking form, and the flue gas is accelerated when passing through the bottoms, so that unreacted slaked lime and the like are carried into the left chamber by the flue gas and continuously react with sulfur dioxide in the flue gas.
5) The bottom of the dry desulfurization tower is provided with a conical ash bucket structure, and sodium sulfate generated by reaction is discharged through a star-shaped discharge valve. Here, since the generation of sulfate is high and continuous discharge is required, two star-shaped discharge valves are arranged so that the sealing property in the column can be ensured.
6) According to the conical structure at the bottom of the dry desulfurization tower, when the ash bucket discharges ash, if the flow is blocked, the compressed air interface is opened to enable compressed air to enter the ash bucket and loosen materials accumulated at the bottom of the ash bucket, so that sulfate is smoothly discharged out of the desulfurization device.
7) The dry desulfurization comprehensively utilizes the reaction of the front and rear flues of the desulfurization tower to remove sulfur dioxide, the design of an inlet Venturi, the design of an inertia shutter type mixer in the desulfurization tower, the design of left and right desulfurization chambers in the desulfurization tower and the design of accelerated return of flue gas at the first ash bucket at the bottom, so that the dry desulfurization tower has compact and not huge structure, but long reaction time and better desulfurization effect.
In conclusion, the invention adopts the slaked lime dry desulphurization method to remove the acid gas (sulfur dioxide) in the flue gas, and no waste water and waste acid liquor are discharged in the treatment of the method, thereby reducing the secondary pollution. Meanwhile, the invention carries out a series of transformation designs on the industrial furnace dry-method desulphurization device, so that the device has compact structure, low investment and easy operation, and the desulphurization efficiency is obviously improved.
Drawings
FIG. 1 is a schematic structural diagram of a dry desulfurization device for an industrial furnace according to the present invention.
Wherein: 1. steam interface, 2, inlet flue, 3, slaked lime interface, 4, venturi, 5, inertia shutter type mixer, 6, dry desulfurizing tower, 7, star-shaped discharge valve, 8, compressed air interface, 9, star-shaped discharge valve, 10, first ash bucket, 11, second ash bucket 11.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The embodiment discloses an industrial furnace dry desulphurization device, the structure of which is shown in fig. 1, and the industrial furnace dry desulphurization device comprises an industrial furnace dry desulphurization tower 6, an inlet flue 2 and an outlet flue 9, wherein the dry desulphurization tower 6 is divided into a left desulphurization chamber and a right desulphurization chamber by a vertically arranged partition plate, and the lower edge of the partition plate in the dry desulphurization tower 6 extends into a first ash hopper 1/2-1/3. Left side desulfurization chamber and right desulfurization chamber bottom intercommunication, 6 bottoms of desulfurizing tower are provided with first ash bucket 10, first ash bucket 10 lower parts are provided with compressed air interface 8, ash discharge port department establishes ties in first ash bucket bottom is provided with star type discharge valve 7, and the leakproofness of flue gas in the tower can be ensured in setting up of two star type discharge valves. The sodium sulfate generated by the reaction can be discharged in time through a star-shaped discharge valve. The left desulfurization chamber is communicated with the bottom of the right desulfurization chamber through a first ash bucket, the ash bucket is of a conical structure (in a necking form), and the flue gas is accelerated when passing through the first ash bucket, so that unreacted slaked lime and the like are carried by the flue gas, rotate at 180 ℃, enter the left desulfurization chamber and continue to react with sulfur dioxide in the flue gas.
The middle upper part of the right desulfurization chamber is provided with an inertia louver type mixer 5, the inertia louver type mixer 5 is arranged to enhance the mixing of the flue gas and the slaked lime, the reaction time of the flue gas and the slaked lime in the desulfurization tower is prolonged, and the desulfurization efficiency is further improved.
The method for performing flue gas desulfurization by adopting the dry desulfurization device for the industrial furnace comprises the following steps: after being mixed with low-pressure steam in the inlet flue 2, the flue gas is further mixed with slaked lime in a Venturi to enter a right desulfurization chamber of a desulfurization tower 6 in an accelerating way, and is further mixed with the flue gas and the slaked lime in an inertia shutter type mixer 5, and the flue gas runs from top to bottom; the flue gas enters the left desulfurization chamber from the right desulfurization chamber through the bottom ash hopper, the flue gas runs from bottom to top, and after the flue gas is subjected to desulfurization reaction in the dry-method desulfurization tower 6, the flue gas is discharged from the bottom side surface of the outlet flue 9 and enters a subsequent process (such as a flue gas treatment device-a cloth bag dust remover).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The dry desulfurization device for the industrial furnace is characterized by comprising a dry desulfurization tower (6), an inlet flue (2) and an outlet flue (9), wherein the dry desulfurization tower (6) is divided into a left desulfurization chamber and a right desulfurization chamber by a vertically arranged partition plate, the bottoms of the left desulfurization chamber and the right desulfurization chamber are communicated, a first ash hopper (10) is arranged at the bottom of the dry desulfurization tower (6), a compressed air interface (8) is arranged at the lower part of the first ash hopper, and a star-shaped discharge valve (7) is arranged at an ash discharge port at the bottom of the first ash hopper; import flue (2) are through venturi (4) and right desulfurization room top intercommunication, the throat department of venturi (4) is provided with slaked lime interface (3), be provided with steam interface (1) on import flue (2), left side desulfurization room top and export flue (9) intercommunication.
2. The industrial furnace dry desulphurization device according to claim 1, wherein the venturi (4) is a venturi constriction tube.
3. The dry desulfurization device for industrial furnaces according to claim 1, characterized in that the upper middle part of the right desulfurization chamber is provided with an inertial louver mixer (5).
4. The dry desulphurization device for industrial furnaces according to claim 1, wherein two star-shaped discharge valves (7) are arranged in series at the ash discharge outlet at the bottom of the first ash hopper (10).
5. The dry desulphurization device for the industrial furnace according to claim 1, wherein the lower edge of the partition plate in the dry desulphurization tower (6) extends into the first ash hopper (10) 1/2-1/3.
6. The dry desulphurization device for industrial furnaces according to claim 1, wherein the bottom of the outlet flue (9) is provided with a second ash hopper (11), and the outlet of the second ash hopper (11) is provided with a star-shaped discharge valve.
7. The dry desulphurization device for industrial furnaces according to claim 1 or 6, wherein the lower side of the outlet flue (9) is provided with a flue gas outlet.
8. The industrial furnace dry desulphurization device according to claim 1, wherein the steam interface (1) is a low pressure steam interface.
9. The dry desulfurization device for the industrial furnace according to claim 1, characterized in that the slaked lime joint (3) is disposed separately from the steam joint (1), the steam joint (1) is disposed on the flue in front of the slaked lime joint (3), and the flue gas is mixed with the steam in the flue to humidify the flue gas.
10. The dry desulfurization method for the industrial furnace is characterized by comprising the following steps of: after the flue gas and the steam are mixed to reach a certain moisture content, the flue gas and the steam are further mixed with slaked lime in a Venturi to enter a right desulfurization chamber of a desulfurization tower in an accelerating manner, and the flue gas runs from top to bottom; the flue gas enters the left desulfurization chamber from the right desulfurization chamber through the first ash bucket at the bottom, the flue gas runs from bottom to top, and the flue gas is discharged after undergoing a desulfurization reaction in the desulfurization tower and enters a subsequent process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113499682A (en) * | 2021-08-21 | 2021-10-15 | 杭州航民江东热电有限公司 | Desulfurizing cylinder |
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| CN113499682A (en) * | 2021-08-21 | 2021-10-15 | 杭州航民江东热电有限公司 | Desulfurizing cylinder |
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