CN106422735A - Single-column dual-cycle efficient desulfurization process system and method - Google Patents
Single-column dual-cycle efficient desulfurization process system and method Download PDFInfo
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- CN106422735A CN106422735A CN201610732782.7A CN201610732782A CN106422735A CN 106422735 A CN106422735 A CN 106422735A CN 201610732782 A CN201610732782 A CN 201610732782A CN 106422735 A CN106422735 A CN 106422735A
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- slurries
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 38
- 230000023556 desulfurization Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims abstract description 84
- 238000010521 absorption reaction Methods 0.000 claims abstract description 44
- 238000005507 spraying Methods 0.000 claims abstract description 29
- 239000010440 gypsum Substances 0.000 claims abstract description 25
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 18
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 8
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims abstract description 4
- 235000010261 calcium sulphite Nutrition 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 49
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000009827 uniform distribution Methods 0.000 claims description 14
- 235000019738 Limestone Nutrition 0.000 claims description 10
- 239000006028 limestone Substances 0.000 claims description 10
- 238000005728 strengthening Methods 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 210000002966 serum Anatomy 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 241001347978 Major minor Species 0.000 claims description 3
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 230000009123 feedback regulation Effects 0.000 claims description 3
- 239000003517 fume Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 2
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 2
- 238000000889 atomisation Methods 0.000 claims description 2
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 claims description 2
- 239000006071 cream Substances 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000004571 lime Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000011268 mixed slurry Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009466 transformation Effects 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
- B01D53/46—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
-
- 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
- B01D53/502—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 solution or suspension
-
- 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
- B01D2251/606—Carbonates
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (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 relates to a single-column dual-cycle efficient desulfurization process system. The system comprises a main absorption tower, a main slurry tank and an auxiliary slurry tank, wherein a flue gas inlet is formed in one side of the lower part of the main absorption tower, and a flue gas outlet is formed in the upper part of the main absorption tower; a gypsum slurry oxidizing slurry tank is arranged at the bottom of the main absorption tower as the main slurry tank; and two absorption regions including a main cycle spraying region and an auxiliary cycle spraying region are arranged in a spraying region of the main absorption tower. The single-column dual-cycle efficient desulfurization process system has the characteristics and beneficial effects that spraying slurry of the main spraying region and the auxiliary spraying region absorbs SO2, absorbed and fused SO2 is strengthened by virtue of mass transfer components arranged between the main spraying region and the auxiliary spraying region, and finally the pH value of the mixed slurry is 4.5-5.0, so that calcium sulfite in the slurry of the main slurry tank is helped to be oxidized into calcium sulfate by virtue of forced-oxidation air and finally crystallizes to form gypsum, and the gypsum slurry is discharged by virtue of a gypsum discharging pump.
Description
Technical field
This patent relates to Limestone-gypsum Wet Flue Gas Desulfurization Process field, is specifically related to a kind of single column Two-way Cycle high-efficiency desulfurization technique
System and method.
Background technology
In recent years, multinomial policy was put into effect in country and place continuously, it is desirable to coal-burning power plant steps up to implement minimum discharge, its moderate heat
The SO of boiler of power plant2Concentration of emission needs as little as 35mg/m3Hereinafter, new environmental requirement to be met, need control coal burning machine further badly
Group flue gas SO2Discharge, improve desulfuration efficiency.And single column single cycle spray desulphurization system conventional at present is all difficult to meet want
Ask.
A lot of units have developed the technique such as double tower double circulation desulphurization, single column double circulation desulphurization, and wherein double tower Two-way Cycle takes off
Sulphur arranges two absorption towers due to needs, uses mode in parallel or in series to run, higher to arrangement site requirements, Hen Duo electricity
Periphery place, factory former absorption tower is difficult to meet double tower arrangement requirement.Absorption tower and auxiliary slurries based on single column double circulation desulphurization is basic
The structural shape of case, the top of the spraying layer on former absorption tower increases the spraying layer of transformation, and the slurries of spray need to collect to tower
Outer auxiliary slurry tank；Bringing top, main absorption tower spray section needs to increase more space and carrys out slurries collection device and cause suction
The big problem of receipts district space waste, improvement project amount.
Content of the invention
It is an object of the invention to overcome prior art not enough, provide a kind of rational in infrastructure, improve desulfuration efficiency and desulfurization
The single column Two-way Cycle high-efficiency desulfurization process system of quality and method.
For realizing above-mentioned technical purpose, present invention employs techniques below scheme：This single column Two-way Cycle high-efficiency desulfurization work
Process system, including main absorption tower, main stock tank and deutoplasm pond；Described side, bottom, main absorption tower arranges smoke inlet, and top sets
Put exhanst gas outlet；Gypsum slurries oxidation stock tank is set bottom main absorption tower as main stock tank；The spray district on main absorption tower is set to
Two absorb interval：Major cycle spray district and secondary circulated sprinkling district；Major cycle spray district uses the slurries of main stock tank by absorbing
Tower slurry circulating pump is squeezed into spraying layer and is sprayed, and secondary circulated sprinkling district uses the slurries in deutoplasm pond by the outer slurry circulating pump of tower
Squeeze into spraying layer to spray；Every layer of spraying layer is disposed with some nozzles, is positioned at the nozzle around the tower wall of uptake zone periphery
Angle uses 90 °, and the nozzle angle being positioned at other regions uses 90 °, 120 ° or Bidirectional nozzle, and the atomization coverage rate of nozzle is not low
In 300%；Major cycle spray district and secondary circulated sprinkling district all use top to arrange spraying layer, bottom arranges a floor flue gas strengthening and passes
The structure of matter component；In described absorption tower, major cycle spray district and secondary circulated sprinkling district are respectively provided with a floor airflow uniform distribution component；
Main stock tank configuration oxidation air system bottom main absorption tower.
As preferably：Main absorption tower uses circular or square；Deutoplasm pond uses circular, square or xoncrete structure pattern.
As preferably：Main stock tank uses side stir device；Deutoplasm pond uses side stir device or inputting type agitator.
As preferably：Airflow uniform distribution plate uses porous media form, for circular or square hole.
As preferably：Major cycle spray district or secondary circulated sprinkling district are all at least provided with ground floor spraying layer, and ground floor sprays
The spraying layer of two-layer or more can be set on layer.
As preferably：Major cycle spray district arranges 2～3 floor spraying layer, and secondary spray district arranges 1～2 floor spraying layer.
As preferably：The corresponding slurry circulating pump of every layer of spraying layer in major-minor circulated sprinkling district or two serum recycle
Pump.
As preferably：Oxidation air system uses oxidation air spray gun or uses oxidation air ductwork type.
The method of this single column Two-way Cycle high-efficiency desulfurization process system, comprises the steps：
Step one, flue gas, by main absorption tower, carries out first order desulfurization through major cycle spray district, slurries in main stock tank
PH value controls 4.5～5.5, and the slurries time of staying in main stock tank is not less than 4min；
Step 2, flue gas carries out second level desulfurization by secondary circulated sprinkling district after first order desulfurization again, in deutoplasm pond
The pH value of slurries can be regulated and controled 5.5～6 by the amount of regulation supply lime stone slurry, and the slurries time of staying in deutoplasm pond is not
Less than 2min；
Step 3, the serum density in main stock tank is higher than 1100～1130kg/m3When, on the one hand gypsum slurries passes through gypsum
Excavationg pump drains into gypsum dehydration system, and on the other hand the solution of main stock tank is by absorption tower demisting device flushing water and secondary circulated sprinkling district
The slurries supply of spray；Deutoplasm pond solution is fed by lime stone slurry pipeline and keeps connecting with main stock tank；
Major cycle spray district and secondary circulated sprinkling district sprayed slurry absorb SO2, through major cycle spray district and secondary circulation
The mass transfer elements arranging in the middle of spray district, strengthening absorbs merges SO2, and the pH value of the slurries of final mixing becomes 4.5～5.0,
Calcium sulfite in main stock tank slurries, through forcing the oxidation of oxidation air, becomes calcium sulfate, finally crystallizes into gypsum, calcium plaster
Liquid is discharged by gypsum excavationg pump；
The pH value of the slurries in secondary circulated sprinkling district is 5.5～6.0 by adjusting the amount control of fresh limestone slurries, lime
The slurries increment of stone depends on desulfurization fume amount, sulfur content and existing pH value, according to outlet desulfurization general export SO2Control
Concentration tracing feedback regulation processed；Deutoplasm pond slurries squeeze into secondary circulated sprinkling district, absorption tower, secondary circulation by the outer slurry circulating pump of tower
Spray district sprayed slurry is high ph-values, for SO in flue gas2Trapping again absorb.
The present invention has following feature and beneficial effect：
Main jet drenches district and secondary spray district sprayed slurry owing to absorbing SO2, and the biography arranging in the middle of major-minor spray district
Matter component, strengthening absorbs merges SO2, and the pH value of the slurries of final mixing becomes 4.5～5.0, contributes in main stock tank slurries
Calcium sulfite through pressure oxidation air oxidation, become calcium sulfate, finally crystallize into gypsum, gypsum slurries is arranged by gypsum
Go out pump to discharge.
The pH value of the slurries in deutoplasm pond is 5.5～6.0 by adjusting the amount control of fresh limestone slurries, the slurry of lime stone
Liquid increment depends on desulfurization fume amount, sulfur content and existing pH value, concrete according to outlet desulfurization general export SO2Control
Concentration tracing feedback regulation.Deutoplasm pond slurries squeeze into secondary spray district, absorption tower by slurry circulating pump, due to pair spray district spray
The high ph-values of slurries is conducive to SO in flue gas2Trapping again absorb.Ensure efficient desulfuration efficiency.
Can realize that desulfuration efficiency improves to more than 99%, improve the quality of desulfurated plaster；Can reduce again system energy consumption,
Reduce improvement cost, save place, convenient construction.
Brief description
Fig. 1 is the process structure schematic diagram of this patent；
Fig. 2 is that in this patent, airflow uniform distribution member planar arranges schematic diagram；
Fig. 3 is the module diagram of airflow uniform distribution component in this patent；
Description of reference numerals：The outer stock tank of main absorption tower the 1st, main stock tank the 2nd, absorption tower stock tank and tower communicating pipe the 3rd, deutoplasm pond the 4th,
The 8th, the lime stone flow inlet of the outer stock tank of outer slurry circulating pump the 6th, the tower of outer slurry circulating pump the 5th, the multiple stage tower of tower the 7th, secondary circulated sprinkling district inhales
Receive tower slurry circulating pump the 9th, multiple stage absorption tower slurry circulating pump the 10th, major cycle spray district's the 11st, lower floor's mass transfer or airflow uniform distribution component
12nd, upper strata mass transfer or airflow uniform distribution component the 13rd, main stock tank side-feeding mixer the 14th, oxidation air spray gun the 15th, deutoplasm pond side-feeding type
Agitator the 16th, gypsum excavationg pump 17.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.The explanation of following embodiment is only intended to help to understand this
Invention.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, also
Can carry out some improvement and modification to the present invention, these improve and modify the protection domain also falling into the claims in the present invention
In.
As shown in Figure 1 to Figure 3, the single column Two-way Cycle high-efficiency desulfurization process system of the present embodiment, main absorption tower 1 top is provided with
Major cycle sprays district 11, and main stock tank 2 is connected with an absorption tower slurry circulating pump 9 or multiple stage absorption tower slurry circulating pump 10, excellent
Elect 3 as；
Described main absorption tower 1 top is provided with secondary circulated sprinkling district 8, and deutoplasm pond 4 is connected with an absorption tower serum recycle
Pump 5 or multiple stage absorption tower slurry circulating pump 6, preferably 2；
Described major cycle spray district 11 constitutes main jet with lower floor's mass transfer or airflow uniform distribution component 12 and drenches district, and major cycle sprays
District 11 is positioned at lower floor's mass transfer or the top of airflow uniform distribution component 12；
Described secondary circulated sprinkling district 8 and upper strata mass transfer or airflow uniform distribution component 13 constitute secondary spray district, secondary circulation spray
Drench district 8 and be positioned at upper strata mass transfer or the top of airflow uniform distribution component 13；
Described main jet drenches district and constitutes first order desulfurization, the district's composition second level desulfurization of secondary spray, and main jet drenches district and is positioned at
The bottom in secondary spray district.
Described main stock tank 2 configures main stock tank side-feeding mixer 14, and the quantity being not limited to agitator has multiple stage；
Described deutoplasm pond 4 configures deutoplasm pond side-feeding mixer 16, and the quantity being not limited to agitator has multiple stage；
Described deutoplasm pond 4 regulates the slurry pH value in deutoplasm pond 4 by the lime stone flow inlet 7 of the outer stock tank of tower, maintains
5.5～6.0 is interval；
Slurry circulating pump 5th, multiple stage tower outer with tower outer slurry circulating pump 6 in described secondary circulated sprinkling district 8 connects corresponding；Master follows
Ring spray is drenched district 11 and is connected corresponding with absorption tower slurry circulating pump the 9th, multiple stage absorption tower slurry circulating pump；
Described bottom, secondary circulated sprinkling district 8 arranges upper strata mass transfer or airflow uniform distribution component 13 1 floor, and major cycle sprays district
11 bottoms arrange lower floor's mass transfer or airflow uniform distribution component 12 1 layers.
The slurries of described main stock tank 2 form gypsum through oxidizing and crystallizing, and gypsum slurries squeezes into stone by gypsum excavationg pump 7
Cream dewatering system；The composition of gypsum dehydration system does not constitute the limiting factor to this patent.
Claims (9)
1. a single column Two-way Cycle high-efficiency desulfurization process system, it is characterised in that：Including main absorption tower (1), main stock tank (2) and pair
Stock tank (4)；Described main absorption tower (1) side, bottom arranges smoke inlet, and top arranges exhanst gas outlet；Main absorption tower (1) end
Portion arranges gypsum slurries oxidation stock tank as main stock tank (2)；The spray district on main absorption tower (1) is set to two and absorbs interval：Main
Circulated sprinkling district (11) and secondary circulated sprinkling district (8)；Major cycle spray district (11) uses the slurries of main stock tank (2) to pass through absorption tower
Slurry circulating pump (9) is squeezed into spraying layer and is sprayed, and secondary circulated sprinkling district (8) uses the slurries in deutoplasm pond (4) to pass through tower ectoplasm
Liquid circulating pump (5) is squeezed into spraying layer and is sprayed；Every layer of spraying layer is disposed with some nozzles, is positioned at the tower wall of uptake zone periphery
Nozzle angle around uses 90 °, and the nozzle angle being positioned at other regions uses 90 °, 120 ° or Bidirectional nozzle, the atomization of nozzle
Coverage rate is not less than 300%；Major cycle spray district (11) all uses top to arrange spraying layer, bottom with secondary circulated sprinkling district (8)
The structure of one layer of flue gas strengthening mass transfer elements is set；Major cycle spray district (11) and secondary circulated sprinkling district in described absorption tower
(8) it is respectively provided with one layer of airflow uniform distribution component；Main stock tank (2) the configuration oxidation air system of bottom, main absorption tower (1).
2. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Main absorption tower (1) is adopted
With circular or square；Deutoplasm pond (4) uses circular, square or xoncrete structure pattern.
3. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Main stock tank (2) uses
Side stir device；Deutoplasm pond (4) uses side stir device or inputting type agitator.
4. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Airflow uniform distribution plate uses
Porous media form, for circular or square hole.
5. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Major cycle sprays district
(11) or secondary circulated sprinkling district all (8) is at least provided with ground floor spraying layer, ground floor spraying layer can be arranged two-layer or with
On spraying layer.
6. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Major cycle spray district sets
Putting 2～3 layers of spraying layer, secondary spray district arranges 1～2 floor spraying layer.
7. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Major-minor circulated sprinkling district
(11) the corresponding slurry circulating pump of every layer of spraying layer or two slurry circulating pumps.
8. single column Two-way Cycle high-efficiency desulfurization process system according to claim 1, it is characterised in that：Oxidation air system is adopted
With oxidation air spray gun (15) or employing oxidation air ductwork type.
9. the method for single column Two-way Cycle high-efficiency desulfurization process system as claimed in claim 1, it is characterised in that include walking as follows
Suddenly：
Step one, flue gas, by main absorption tower (1), carries out first order desulfurization through major cycle spray district (11), in main stock tank (2)
The pH value of slurries controls 4.5～5.5, and the slurries time of staying in main stock tank (2) is not less than 4min；
Step 2, flue gas carries out second level desulfurization, deutoplasm pond (4) by secondary circulated sprinkling district (8) after first order desulfurization again
The pH value of middle slurries can be regulated and controled 5.5～6 by the amount of regulation supply lime stone slurry, and the slurries in deutoplasm pond (4) stop
Time is not less than 2min；
Step 3, the serum density in main stock tank (2) is higher than 1100～1130kg/m3When, on the one hand gypsum slurries is arranged by gypsum
Going out pump (17) and draining into gypsum dehydration system, on the other hand the solution of main stock tank (2) is by absorption tower demisting device flushing water and secondary circulation
The slurries supply that spray district (8) sprays；Deutoplasm pond (4) solution is fed by lime stone slurry pipeline and keeps with main stock tank (2)
Connection；
Major cycle spray district (11) and secondary circulated sprinkling district (8) sprayed slurry absorb SO2, through major cycle spray district (11) and
The mass transfer elements arranging in the middle of secondary circulated sprinkling district (8), strengthening absorbs merges SO2, and the pH value of the slurries of final mixing becomes 4.5
～5.0, the calcium sulfite in main stock tank slurries, through forcing the oxidation of oxidation air, becomes calcium sulfate, finally crystallizes into stone
Cream, gypsum slurries is discharged by gypsum excavationg pump；
The pH value of the slurries of secondary circulated sprinkling district (8) is 5.5～6.0 by adjusting the amount control of fresh limestone slurries, lime
The slurries increment of stone depends on desulfurization fume amount, sulfur content and existing pH value, according to outlet desulfurization general export SO2Control
Concentration tracing feedback regulation processed；Deutoplasm pond (4) slurries squeeze into secondary circulated sprinkling district, absorption tower by the outer slurry circulating pump (5) of tower
(8), secondary circulated sprinkling district (8) sprayed slurry is high ph-values, for SO in flue gas2Trapping again absorb.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109569235A (en) * | 2018-11-29 | 2019-04-05 | 孙信 | A kind of industrial waste gas extract recovery processing technique |
| CN110124501A (en) * | 2019-05-17 | 2019-08-16 | 中国神华能源股份有限公司 | Flue gas purification system and method |
| CN111068503A (en) * | 2019-12-17 | 2020-04-28 | 浙江天地环保科技有限公司 | Limestone slurry supply accurate adjustment controller and control method for desulfurization system after ultralow emission of flue gas |
| CN112246090A (en) * | 2020-10-23 | 2021-01-22 | 大唐环境产业集团股份有限公司 | Desulfurizing tower thick liquid pond |
| CN112426869A (en) * | 2020-11-22 | 2021-03-02 | 西安热工研究院有限公司 | System and method for controlling slurry concentration of wet desulphurization absorption tower of thermal power generating unit |
| CN113593653A (en) * | 2021-07-05 | 2021-11-02 | 国能龙源环保有限公司 | Method for optimally controlling overall economic benefits of wet desulphurization device |
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| EP0162536A1 (en) * | 1984-02-20 | 1985-11-27 | Babcock-Hitachi Kabushiki Kaisha | Apparatus for wet type flue gas desulfurization |
| CN104226099A (en) * | 2014-08-19 | 2014-12-24 | 浙江大学 | Efficient desulfurization single-tower double-circulation system and method |
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| CN104226099A (en) * | 2014-08-19 | 2014-12-24 | 浙江大学 | Efficient desulfurization single-tower double-circulation system and method |
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