CN106823788B - Device and method for removing sulfur trioxide - Google Patents
Device and method for removing sulfur trioxide Download PDFInfo
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- CN106823788B CN106823788B CN201710127541.4A CN201710127541A CN106823788B CN 106823788 B CN106823788 B CN 106823788B CN 201710127541 A CN201710127541 A CN 201710127541A CN 106823788 B CN106823788 B CN 106823788B
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- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 14
- 230000002745 absorbent Effects 0.000 claims abstract description 47
- 239000002250 absorbent Substances 0.000 claims abstract description 47
- 238000010790 dilution Methods 0.000 claims abstract description 24
- 239000012895 dilution Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 38
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 27
- 239000003546 flue gas Substances 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 19
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000007865 diluting Methods 0.000 claims description 9
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 238000004090 dissolution Methods 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 3
- 239000000347 magnesium hydroxide Substances 0.000 claims description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 4
- 230000035484 reaction time Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
Abstract
The invention provides a device for removing sulfur trioxide, which comprises a dissolving tank, a liquid storage tank, a dilution water tank, an SCR (selective catalytic reduction) reactor and an air preheater, wherein the dissolving tank is connected with the liquid storage tank. The invention improves the utilization rate of the absorbent and effectively reduces the influence on corrosion and dust accumulation of the rear-end air preheater.
Description
Technical Field
The invention relates to the field of coal flue gas treatment devices and methods, in particular to a device and a method for removing sulfur trioxide.
Background
The sulfur content of the coal in China is 0.47% -2.43%, and the coal is oxidized into SO in the combustion process 2 Wherein about 0.5% -2% SO 2 Will be further oxidized into SO 3 . After a Selective Catalytic Reduction (SCR) denitration process is applied to a power plant on a large scale, about 0.3% -2% of SO is contained 2 Conversion to SO with a vanadium-based catalyst 3 。
SO in flue gas 3 The increase in content has a great impact on the plant flue gas treatment equipment. SO (SO) 3 Can react with escaped ammonia in the SCR reactor to generate Ammonium Bisulfate (ABS), and is conveyed to the downstream along with the flue gas, and is adhered to the surfaces of the air preheater and the fan equipment, so that the air preheater is extremely difficult to clean, and the pollution and corrosion are caused; in addition, SO 3 Will react with water vapor to form H 2 SO 4 Steam, if the temperature of the pipe is too low, the sulfuric acid steam may condense in the pipe, thereby corroding the pipe, while the FGD tower is resistant to SO 3 Is limited when H in the flue gas 2 SO 4 The mass fraction of (2) is (1.0-2.0) x 10 -5 When the color is changed, a blue and yellow feathering, also called a blue feathering phenomenon, is generated.
Patent No. 201610737947.XChinese patent discloses a system for removing sulfur trioxide in flue gas of a power station boiler, wherein a pneumatic two-fluid nozzle is arranged at the position of an SCR denitration inlet of the system to spray absorbent solution, but the method cannot remove SO generated in an SCR reactor 3 SO generated later cannot be avoided 3 Plugging and corrosion of the air preheater.
The chinese patent No. 201510298152.9 discloses a device and method for removing sulfur trioxide from flue gas, which sprays strongly alkaline solid particles as absorbent into the flue, the size of the absorbent particles is 20-150 μm. The absorbent of the type has larger particle size and smaller specific surface area, and the absorbent is not fully utilized, so that the waste of the absorbent is easily caused. In addition, the patent also discloses that the residence time of the absorbent in the flue gas is 0.1-2s, and the patent does not consider the situation that the residence time does not reach the reaction requirement when the flue between the outlet of the SCR reactor and the air preheater is short, which leads to that the absorbent and SO in the flue gas 3 The reaction is insufficient.
Disclosure of Invention
In order to solve the problems, the invention provides a device for removing sulfur trioxide, which comprises a dissolving tank, a liquid storage tank, a dilution water tank, an SCR (selective catalytic reduction) reactor and an air preheater, wherein the dissolving tank is connected with the liquid storage tank.
Further, the expansion flue sequentially comprises an air inlet, a front-end horn mouth, a rectangular area, a rear-end horn mouth and an air outlet from top to bottom.
Further, the expansion flue is a vertical expansion flue or a horizontal expansion flue, and m ash hoppers are arranged at the lower part of the horizontal expansion flue, wherein m is more than or equal to 1.
Further, the included angles alpha and beta of the front end flare opening and the rear end flare opening are between 100 degrees and 130 degrees.
Further, the air inlet and the air outlet are respectively provided with a temperature, pressure and flow velocity measuring device.
Further, spray guns are respectively arranged on two sides, perpendicular to the flow direction of the flue gas, in the expansion flue, and an air flow distribution plate is arranged at the joint of the front horn mouth and the rectangular area.
Further, the aperture ratio of the airflow distribution plate is 30% -60%.
Further, the air flow distribution plate is 200-600mm from the spray gun.
The invention also provides a method for removing sulfur trioxide, which is characterized by comprising the following steps:
a. dissolving, namely placing one or two of sodium carbonate and sodium bicarbonate serving as main absorbents and one or more of calcium carbonate, magnesium hydroxide and calcium hydroxide serving as additives into a dissolving tank for heating and dissolving to prepare a solution, wherein the mol ratio of the main absorbents to the additives is 1: (0.001-0.05);
b. diluting, namely, the solution in the dissolving tank is diluted according to SO at the outlet of the SCR reactor 3 Diluting the concentration into an absorbent solution with the mass fraction of 10-20%;
c. spraying, namely spraying absorbent solution to the front end of an expansion flue between the SCR reactor and the air preheater through a metering and distributing system and a spray gun, wherein the absorbent and SO are mixed in the expansion flue 3 Reaction is carried out to remove SO 3 The purpose is that.
Further, the residence time of the gas inside the expansion flue is 1.0-2.5s.
The device and the method for removing sulfur trioxide have the following advantages:
1. alkali liquor is sprayed into the flue, and condensation nuclei with larger specific surface area are formed after evaporation, so that the utilization rate of the absorbent is improved;
2. the expansion flue can ensure the absorbent and SO in the flue gas 3 Has sufficient reaction time to obtain higher SO 3 The removal rate can effectively improve the utilization rate of the absorbent.
3. The temperature, pressure and flow rate measuring device of the inlet and the outlet of the expansion flue can well reflect the spraying and reaction conditions in the flue, and accordingly, the spraying is correspondingly adjusted.
Drawings
FIG. 1 is a schematic view of an apparatus for removing sulfur trioxide according to the invention;
FIG. 2a is a schematic view of a short flue;
FIG. 2b is a schematic view of an expansion stack according to the present invention;
FIG. 3a is a schematic view of a vertical expansion flue according to the present invention;
FIG. 3b is a schematic view of a horizontal expansion flue according to the present invention;
FIG. 4 is a schematic view of the structure of the inside of the expansion flue according to the present invention.
In the figure: 1-dissolving tank, 2-liquid storage tank, 3-dilution water tank, 4-metering and distribution system, 4-1-dilution system, 5-dissolving pump, 6-solution pump, 7-dilution water pump, 8-SCR reactor, 9-common short flue, 10-expansion flue, 11-air preheater, 12-air inlet, 13-front end bell mouth, 14-air flow distribution plate, 15-spray gun, 16-rectangular area, 17-rear end bell mouth, 18-air outlet, 19-test hole, 20-ash bucket, 21-transfer line, 22-gas pipe, 23-180 DEG nozzle, 24-360 DEG nozzle.
Detailed Description
The following detailed description of one embodiment of an apparatus and method for removing sulfur trioxide according to the present invention is provided for illustration only and not for the purpose of limiting the scope of the invention, as modifications to the invention in its various equivalent forms will fall within the scope of the invention as defined in the appended claims.
The meaning of the short flue in the invention is: alkali liquor at downstream of spraying position and SO in flue gas 3 The effective reaction distance is insufficient, resulting in a flue with short reaction time.
Referring to fig. 1, a device for removing sulfur trioxide comprises a dissolution tank 1 and a dilution water tank 3, wherein the dissolution tank 1 is sequentially connected with a dissolution pump 5, a liquid storage tank 2, a solution pump 6 and a dilution system 4-1, the dissolution tank 1, the liquid storage tank 2 and the dilution water tank 3 are provided with heat tracing devices, the dissolution tank 1 and the dilution water tank 3 are respectively connected with the dilution system 4-1, a dilution water pump 7 is connected between the dilution water tank 3 and the dilution system 4-1, the dilution system 4-1 is arranged in a metering and distributing system 4, and the metering and distributing system 4 is connected with an expansion flue 10. As shown in fig. 2a, the short flue 9 between the SCR reactor 8 and the air preheater 11 is modified to an extended flue 10 when the reaction time requirements cannot be met, as in fig. 2b. The vertical space is enough to be arranged as a vertical expansion flue, as shown in fig. 3a, and the horizontal space is enough to be arranged as a horizontal expansion flue, as shown in fig. 3b, and the lower part of the horizontal expansion flue is provided with an ash bucket 20. As shown in fig. 3a, the expansion flue 10 sequentially comprises an air inlet 12, a front horn mouth 13, a rectangular area 16, a rear horn mouth 17 and an air outlet 18 from top to bottom, the rectangular area 16 is a main reaction area, temperature, pressure and flow velocity measuring devices 19 are respectively arranged on the air inlet 12 and the air outlet 18, an included angle alpha of the front horn mouth 13 and an included angle beta of the rear horn mouth 17 are both 100-130 ℃, an air flow distribution plate 14 is arranged at the joint of the front horn mouth 13 and the rectangular area 16, the opening ratio of the air flow distribution plate 14 is 30-60%, spray guns 15 are respectively arranged at two sides of the expansion flue 10 perpendicular to the flow direction of flue gas, an infusion tube 21 and an air delivery tube 22 are arranged on the spray guns 15, the spray area covers the whole flue, and a coverage rate of 180-220% is 180-degree nozzle 24 and 180-degree nozzle 23 are arranged on the spray guns 15, as shown in fig. 4, and the spray direction and the flue gas are in the same direction. The distance between the gas flow distribution plate 14 and the lance 15 is between 200 and 600mm, and the residence time of the gas inside the expansion stack 10 is between 1.0 and 2.5s.
The invention also provides a method for removing sulfur trioxide by using the device, which comprises the following steps:
a. dissolving, namely placing one or two of sodium carbonate and sodium bicarbonate serving as main absorbents and one or more of calcium carbonate, magnesium hydroxide and calcium hydroxide serving as additives into a dissolving tank for heating and dissolving to prepare a solution; b. diluting, namely diluting the solution in the dissolving tank according to the SO at the outlet of the SCR 3 Diluting the solution into an absorbent solution with the mass fraction of 10-20%; c. spraying, namely spraying absorbent solution to the front end of a short flue between the SCR reactor and the air preheater through a metering and distributing spraying module, wherein the absorbent and SO (sulfur dioxide) are mixed in the short flue 3 Reaction is carried out to remove SO 3 The purpose is that.
As shown in fig. 1 and 4, the absorbent is in the form ofHeating and dissolving in a dissolving tank 1, pumping the solution into a liquid storage tank 2 through a dissolving pump 5, pumping the solution out through a solution pump 6, diluting the solution by using dilution water pumped out through a dilution water pump 7, wherein the dissolving tank 1, the liquid storage tank 2 and the dilution water tank 3 are all provided with heat, diluting an absorbent solution, then introducing the absorbent solution into a spray gun 15 through a metering and distributing 4 and a delivery pipe 21 and compressed air through a delivery pipe 22, atomizing the absorbent solution under the action of the compressed air, and then spraying the atomized absorbent solution into a flue 10 and SO in flue gas 3 Reaction to remove SO 3 Is a target of (a).
Example 1
Certain 350MW unit, selecting mixture of sodium carbonate and sodium bicarbonate as alkaline absorbent, dissolving powdery sodium carbonate and sodium bicarbonate, preparing absorbent solution with mass concentration of 10% with dilution water, and removing SO at the denitration outlet 3 57.5mg/Nm 3 The absorbent solution is atomized under the action of compressed air with the pressure of 0.36MPa, and the atomized absorbent solution is sprayed into the flue with the spraying quantity of 2.7m 3 /hr; the flue adopts a horizontal expansion flue, the total length is 5 meters, the aspect ratio of the cross section of the rectangular area is 2:1, the expansion angle of the front horn mouth and the rear horn mouth of the flue is 120 degrees, the aperture ratio of the air flow distribution plate is 45 percent, the distance between the spray gun and the air flow distribution plate is 500mm, and the residence time of the flue gas in the short flue is 1s; absorbent solution and SO in flue gas 3 After full reaction, the mixture enters an air preheater. Experimental results show that the desulfurization efficiency is above 88%, and SO in the flue gas at the inlet of the air preheater 3 Concentration of less than 6mg/Nm 3 。
Example 2
A 600MW unit, sodium carbonate is selected as alkaline absorbent, powdery sodium carbonate is dissolved and diluted with dilution water to prepare absorbent solution with the mass concentration of 12%, and a denitration outlet SO 3 54.3mg/Nm 3 The absorbent solution is atomized under the action of compressed air with the pressure of 0.32MPa, and the atomized absorbent solution is sprayed into the flue with the spraying quantity of 3.51m 3 /hr; the flue adopts a horizontal expansion flue, the total length is 5.5 m, the aspect ratio of the rectangular area cross section is 2:1, the expansion angle of the front and rear bell mouths of the flue is 120 degrees, the aperture ratio of the air flow distribution plate is 45%, the spray gun is 500mm away from the air flow distribution plate, and the residence time of the flue gas in the flue is1s; absorbent solution and SO in flue gas 3 After full reaction, the mixture enters an air preheater. Experimental results show that the desulfurization efficiency is more than 89%, and SO in the flue gas at the inlet of the air preheater 3 Concentration of less than 5mg/Nm 3 。
An injection device for absorbing agent solution is arranged in an expansion flue of an SCR outlet, SO that SO generated by a boiler and an SCR reactor can be removed 3 And the absorbent solution is sprayed in the flue, and condensation nuclei with larger specific surface area can be formed after the solution is evaporated, so that the utilization rate of the absorbent is improved; the residence time of the flue gas can be prolonged by spraying in the expansion flue, and the absorbent and SO are increased 3 The contact opportunity improves the utilization rate of the absorbent and effectively reduces the influence on corrosion and dust accumulation of the rear-end air preheater.
The invention can remove SO in the flue gas by adopting alkali liquor injection 3 In the process, the effective reaction distance of the flue at the downstream of the injection position is insufficient to satisfy the effective SO 3 The invention can provide sufficient reaction time and partially remove large particles in the flue gas, thereby effectively improving the problems of blockage and corrosion of the air preheater.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
Claims (7)
1. The device for removing sulfur trioxide comprises a dissolving tank (1), a liquid storage tank (2), a dilution water tank (3), an SCR reactor (8) and an air preheater (11), wherein the dissolving tank (1) is connected with the liquid storage tank (2), and is characterized by further comprising a metering and distributing system (4), the metering and distributing system (4) comprises a dilution system (4-1), the liquid storage tank (2) and the dilution water tank (3) are respectively connected with the dilution system (4-1), an expansion flue (10) is arranged between the SCR reactor (8) and the air preheater (11) in a direction perpendicular to the flow direction of flue gas, and the metering and distributing system (4) is connected with the expansion flue (10); the expansion flue (10) sequentially comprises an air inlet (12), a front-end bell mouth (13), a rectangular area (16), a rear-end bell mouth (17) and an air outlet (18) from top to bottom; when the vertical space is sufficient, the expansion flue (10) may be provided as a vertical expansion flue; when the horizontal space is enough, the expansion flue (10) can be set as a horizontal expansion flue, and m ash hoppers (20) are arranged at the lower part of the horizontal expansion flue, wherein m is more than or equal to 1; two sides of the expansion flue (10) perpendicular to the flow direction of the flue gas are respectively provided with a spray gun (15), and the joint of the front horn mouth (13) and the rectangular area (16) is provided with an air flow distribution plate (14); an infusion tube (21) and a gas transmission tube (22) are arranged on the spray gun (15), and the spray area covers the whole flue; the dissolution tank (1), the liquid storage tank (2) and the dilution water tank (3) are all provided with heat tracing, the absorbent solution is transmitted to the infusion tube (21) through the metering and distributing system (4) after being diluted, compressed air enters the spray gun (15) through the air transmission tube (22), and the absorbent solution is atomized and then sprayed into the expansion flue (10) to react with sulfur trioxide in the flue gas under the action of the compressed air.
2. Device for the removal of sulfur trioxide according to claim 1, characterized in that the angles α and β at which the front (13) and rear (17) flares are between 100 ° and 130 °.
3. The sulfur trioxide removal device according to claim 1, characterized in that the air inlet (12) and the air outlet (18) are provided with temperature, pressure and flow measuring means (19), respectively.
4. The device for removal of sulfur trioxide according to claim 1, characterized in that the open area of the gas flow distribution plate (14) is 30-60%.
5. The device for removal of sulfur trioxide according to claim 1, characterized in that the gas flow distribution plate (14) is 200-600mm from the lance (15).
6. A method for removing sulfur trioxide using the device according to any of claims 1-5 comprising the steps of:
a. dissolving, namely placing one or two of sodium carbonate and sodium bicarbonate serving as main absorbents and one or more of calcium carbonate, magnesium hydroxide and calcium hydroxide serving as additives into a dissolving tank (1) for heating and dissolving to prepare a solution, wherein the mol ratio of the main absorbents to the additives is 1: (0.001-0.05);
b. diluting, and the solution in the dissolving tank (1) is according to SO at the outlet of the SCR reactor (8) 3 Diluting the concentration into an absorbent solution with the mass fraction of 10-20%;
c. spraying, namely spraying absorbent solution to the front end of an expansion flue (10) between the SCR reactor (8) and the air preheater through a metering and distributing system (4) and a spray gun, wherein the absorbent and SO are arranged in the expansion flue (10) 3 Reaction is carried out to remove SO 3 The purpose is that.
7. The method for sulfur trioxide removal according to claim 6, characterized in that the residence time of the gas inside the expansion stack (10) is 1.0-2.5s.
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| CN107344061A (en) * | 2017-07-07 | 2017-11-14 | 北京清新环境技术股份有限公司 | A kind of sulfur trioxide and mercury removal system and its removal methods based on magnesium processes desulfurization |
| CN109173687B (en) * | 2018-10-09 | 2021-01-15 | 清华大学 | Method for removing sulfur trioxide in flue gas |
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| CN103055684A (en) * | 2013-02-02 | 2013-04-24 | 山东大学 | Device and process for effectively removing sulfur trioxide in smoke through natural alkali |
| CN103604133A (en) * | 2013-11-05 | 2014-02-26 | 西安热工研究院有限公司 | Flue gas cleaning system and flue gas cleaning process for integrated multi-pollutant removal by dry method |
| CN105854557A (en) * | 2016-04-21 | 2016-08-17 | 上海迪夫格环境科技有限公司 | Method and device for evenly spraying alkali liquor to remove sulfur trioxide in exhaust gas |
| CN105854575A (en) * | 2016-04-26 | 2016-08-17 | 华北电力大学（保定） | Method for simultaneously treating SO3 and desulfurization waste water in exhaust gas of coal-fired power plant |
| CN105879620A (en) * | 2016-05-12 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Two-stage flue gas sulphur trioxide removing device and method for flue gas purification |
| CN206701071U (en) * | 2017-03-06 | 2017-12-05 | 北京清新环境技术股份有限公司 | A kind of device for removing sulfur trioxide |
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| CN106823788A (en) | 2017-06-13 |
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