CN109499304A - The device and technique of sulfur dioxide in a kind of efficient removal coal-fired flue-gas - Google Patents
The device and technique of sulfur dioxide in a kind of efficient removal coal-fired flue-gas Download PDFInfo
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- CN109499304A CN109499304A CN201811610530.2A CN201811610530A CN109499304A CN 109499304 A CN109499304 A CN 109499304A CN 201811610530 A CN201811610530 A CN 201811610530A CN 109499304 A CN109499304 A CN 109499304A
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- 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
- B01D53/502—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
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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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
- B01D53/73—After-treatment of removed components
-
- 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
-
- 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
Abstract
The device and technique of sulfur dioxide in a kind of efficient removal coal-fired flue-gas, it is characterised in that: it includes the desulfurizing tower being sequentially connected by pipeline, slurries oxidation pond, serum recycle pond, slurry circulating pump and the fresh desulfurization agent feeding device being connected with serum recycle pond；The inside of the desulfurizing tower sets gradually flue gas flow equalizing orifice plate, slurries spraying layer, high efficiency demister from former gas inlet between neat stress outlet；The slurries spraying layer in desulfurizing tower is accessed in the serum recycle pond by slurry circulating pump and corresponding pipeline；The slurries oxidation bottom of pond portion is successively connected with cyclone, vacuum strainer machine by slurry discharge pump, corresponding pipeline, and the slurries oxidation pond is connected with oxidation fan by corresponding pipeline.
Description
Technical field
The present invention relates to environmental technology field, a kind of dress of sulfur dioxide in efficient removal coal-fired flue-gas is particularly related to
It sets and technique.
Background technique
In recent years, there is more serious atmosphere pollution phenomenon in many cities in China, life and health to city dweller
It causes to seriously endanger.Pollutant contained by coal-fired flue-gas is the important sources of atmosphere pollution, sulfur dioxide and nitrogen in coal-fired flue-gas
Oxide is the main reason for causing acid rain, while playing an important role to the formation of haze.Therefore, the Chinese government is just gradually real
The stringenter coal-fired flue-gas discharge standard of row must reach ultra-clean discharge in power domain coal-fired flue-gas pollutant of carrying out in an all-round way
(the ultra-clean limited value of discharge standard of power domain coal-burning boiler sulfur dioxide is 35mg/Nm to standard3), it is done step-by-step in non-electrical domain
Coal-fired flue-gas pollutant reaches ultra-clean discharge standard.
Coal-fired flue gas desulfurization technology mainly has desulfurization method of limestone-gypsum technology, seawater Wet Flue Gas Desulfurization Technique, the ammonia process of desulfurization
Technology and circulating fluid bed semi-drying method desulfurization technology etc., wherein desulfurization method of limestone-gypsum technique has technology maturation, operation steady
The advantages that determining is China coal-fired flue gas desulfurization field using most sulfur removal technologies.
With the stringenter coal-fired flue-gas pollutant emission standard of execution, conventional desulfurization method of limestone-gypsum technique
It is difficult to reach the requirement of ultra-clean discharge standard.On the basis of conventional limestone-gypsum sulfur removal technology, to reach coal-fired cigarette
The ultra-clean discharge standard of gas, currently used technical solution are to design desulfurizing tower in sulfur removal technology using two-region, i.e., double pH values
Double circulation desulphurization system, flue gas initially enter the first desulfurization zone after entering desulfurizing tower, the desulfurization slurry pH value in the first desulfurization zone
Lower, most of sulfur dioxide is removed in flue gas, and then flue gas enters the second desulfurization zone, in the second desulfurization zone desulfurization slurry PH
Value is higher, has stronger desulphurizing ability, realizes flue gas deep desulfuration, reaches the ultra-clean discharge standard of flue gas.It applies for a patent
CN202700364U is described a kind of " Two-way Cycle single column desulphurization system ", which realizes double pH value double circulation desulphurizations, desulfurization
Tower is designed using two-region, desulfuration efficiency with higher, but tower body internal structure is complicated, and equipment operation failure rate is higher, fortune
Row maintenance cost is larger.Apply for a patent CN102921287A, describe it is a kind of " double tower Two-way Cycle Wet Limestone Desulfurization device and
Method ", the system are provided with primary cycle desulfurizing tower and secondary cycle desulfurizing tower, realize double pH value double circulation desulphurizations, Ke Yida
To preferable desulfurization effect, but bulk devulcanization system complex, there are two desulfurizing tower and two sets of desulfurization slurry circulatory systems for setting, if
Standby arrangement land occupation is larger, and equipment investment and operation expense are significantly higher.
Summary of the invention
The purpose of the present invention is exactly the shortcoming being directed in the presence of the above-mentioned prior art and provides a kind of new and effective
Remove the system and technique of sulfur dioxide in coal-fired flue-gas.The present invention has the function of good deep desulfuration, can strictly reach
The ultra-clean discharge standard of coal-fired flue-gas.Bulk devulcanization system and desulfurizing tower internal structure are relatively simple, equipment investment and operating cost
It is lower, it is highly-safe, it is easy to maintain；Mark and reducing energy consumption project are mentioned to desulfurization, downtime is short, and improvement expenses are low, to coal quality
Adaptability is stronger.
The purpose of the present invention can be realized by following technique measures:
The device of sulfur dioxide includes the desulfurizing tower being sequentially connected by pipeline, slurries in efficient removal coal-fired flue-gas of the invention
Oxidation pond, serum recycle pond, slurry circulating pump and the fresh desulfurization agent feeding device being connected with serum recycle pond；It is described de-
The inside of sulphur tower sets gradually flue gas flow equalizing orifice plate between outlet from original gas inlet to neat stress, slurries spraying layer, efficiently removes
Day with fog；The slurries spraying layer in desulfurizing tower is accessed in the serum recycle pond by slurry circulating pump and corresponding pipeline；The slurry
Liquid oxidation bottom of pond portion is successively connected with cyclone, vacuum strainer machine by slurry discharge pump and corresponding pipeline, and the slurries
Oxidation pond is connected with oxidation fan by corresponding pipeline.
Heretofore described slurries spraying layer can be set 2 ~ 5 layers.
Heretofore described slurries oxidation pond is respectively set with serum recycle pond, and slurries oxidation pond is arranged under desulfurizing tower
The outside of desulfurizing tower is arranged in portion, serum recycle pond, and the liquid outlet of slurries oxidation pond passes through slurry feeding pump and corresponding pipe
Road is connected with the inlet in serum recycle pond；Slurries oxidation pond blender is provided in slurries oxidation pond, serum recycle is set in pond
It is equipped with serum recycle pond blender.
Heretofore described slurries oxidation pond is respectively set with serum recycle pond, and slurries oxidation pond and serum recycle pond 8 are equal
It is arranged outside desulfurizing tower, and the liquid level of slurry of slurries oxidation pond is lower than the bottom of desulfurizing tower；The slurries oxidation pond and slurries
Circulatory pool 8 is disposed adjacent and is equipped with public pool side；And it is set at the top of the public pool side between slurries oxidation pond and serum recycle pond
It is equipped with interconnected overflow groove；It is provided with slurries oxidation pond blender in slurries oxidation pond, is provided in serum recycle pond 8
Serum recycle pond blender.
A kind of processing step of the invention is as follows:
A, former flue gas flows up after entering desulfurizing tower from former gas inlet, first by flue gas flow equalizing orifice plate, promotes flue gas stream
Move it is more uniform, meanwhile, be covered with desulfurization slurry liquid film above flue gas flow equalizing orifice plate, flue gas when flue gas flow equalizing orifice plate by passing through
Desulfurization slurry liquid film has the function of pre- desulfurization and dedusting to flue gas；Then, flue gas, which continues up, flows into desulfurization slurry spray
Area, slurries spraying layer desulfurization slurry is atomized after to lower spray, contacted with the flue gas adverse current flowed up, the SO in flue gas2Quilt
Desulfurization slurry droplet fully absorbs and reaches deep desulfuration, and desulfurization slurry droplet absorbs SO2Afterwards, it is passed down through flue gas flow equalizing hole
Plate falls into slurries oxidation pond；Flue gas enters high efficiency demister after desulfurization slurry spraying zone deep desulfuration, through high efficiency demister
Neat stress is formed after the tiny desulfurization slurry droplet sufficiently carried in removing flue gas, then neat stress is de- from neat stress outlet discharge
Sulphur tower；
B, desulfurization slurry droplet absorbs SO in flue gas2After fall into slurries oxidation pond, meanwhile, oxidation fan by oxidation air be sent into starch
Liquid oxidation pond；It is provided with slurries oxidation pond blender in slurries oxidation pond, desulfurization slurry is promoted to be sufficiently mixed with oxidation air, sends out
It is raw to force oxidation reaction；Plasm PH value in slurries oxidation pond is 5.0~6.0, which is conducive to desulfurization slurry sulfite
The dissolution and oxidation of calcium and the gypsum for generating high-quality, i.e. CaSO4·2H2O crystal；Due to CaSO4·2H2The specific gravity of O crystal compared with
Greatly, thick slurry is formed in slurries oxidation pond lower part, thick slurry drains into cyclone through slurry discharge pump, is concentrated by cyclone
It is sent again afterwards to vacuum strainer machine, finally formed solids is desulfurized gypsum；
The upper clear supernate of c slurries oxidation pond is sent by slurry feeding pump to serum recycle pond, meanwhile, fresh desulfurization agent feeding device
Fresh desulfurizer slurry is added into serum recycle pond；It is provided with serum recycle pond blender in serum recycle pond, promotes fresh
Desulfurizer slurry is sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotes the slurries PH in serum recycle pond
Value is significantly raised；The high pH value desulfurization slurry in serum recycle pond pumps the slurries spraying layer to desulfurizing tower by serum recycle,
Slurries spraying layer, to lower spray, will be contacted with the flue gas adverse current flowed up, effectively be enhanced after the atomization of high pH value desulfurization slurry
Desulfurization slurry droplet is to SO in flue gas2Quick absorption, achieve the effect that flue gas deep desulfuration；Meanwhile desulphurization system liquid-gas ratio
It is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the operating cost of desulphurization system, and desulphurization system is more energy saving；Cigarette
Gas enters high efficiency demister after deep desulfuration, after the tiny desulfurization slurry droplet through carrying in high efficiency demister removing flue gas
Neat stress is formed, then neat stress exports discharge desulfurizing tower from neat stress.
Another processing step of the invention is as follows:
A, former flue gas flows up after entering desulfurizing tower from former gas inlet, first by flue gas flow equalizing orifice plate, promotes flue gas stream
Move it is more uniform, meanwhile, be covered with desulfurization slurry liquid film above flue gas flow equalizing orifice plate, flue gas when flue gas flow equalizing orifice plate by passing through
Desulfurization slurry liquid film has the function of pre- desulfurization and dedusting to flue gas；Then, flue gas, which continues up, flows into desulfurization slurry spray
Area, slurries spraying layer desulfurization slurry is atomized after to lower spray, contacted with the flue gas adverse current flowed up, the SO in flue gas2Quilt
Desulfurization slurry droplet fully absorbs and reaches deep desulfuration, and desulfurization slurry droplet absorbs SO2Afterwards, it is passed down through flue gas flow equalizing hole
Plate falls into the bottom of desulfurizing tower, then enters slurries oxidation pond through the gravity flow of slurries pipe gravity flow pipeline；Flue gas is sprayed by desulfurization slurry
Enter high efficiency demister after area's deep desulfuration, after high efficiency demister sufficiently removes the tiny desulfurization slurry droplet carried in flue gas
Neat stress is formed, then neat stress exports discharge desulfurizing tower from neat stress；
B, the desulfurization slurry of desulfurization tower bottom enters slurries oxidation pond through the gravity flow of slurries pipe gravity flow pipeline, meanwhile, oxidation fan is by oxygen
Change air and is sent into slurries oxidation pond；It is provided with slurries oxidation pond blender in slurries oxidation pond, promotes desulfurization slurry and oxidation empty
Gas is sufficiently mixed, and occurs to force oxidation reaction；Plasm PH value in slurries oxidation pond is 5.0~6.0, which is conducive to desulfurization
The dissolution and oxidation of slurries sulfite calcium and the gypsum for generating high-quality, i.e. CaSO4·2H2O crystal；Due to CaSO4·2H2O
The specific gravity of crystal is larger, forms thick slurry in slurries oxidation pond lower part, and thick slurry drains into cyclone through slurry discharge pump, leads to
It is sent again after crossing cyclone concentration to vacuum strainer machine, finally formed solids is desulfurized gypsum；
C, slurries oxidation pond is disposed adjacent with serum recycle pond and is equipped with public pool side, is provided with overflow side at the top of public pool side
Hole, the upper clear supernate of slurries oxidation pond cross the gravity flow of the square hole at the top of public pool side and enter serum recycle pond, meanwhile, fresh desulfurization
Fresh desulfurizer slurry is added into serum recycle pond for agent feeding device；The stirring of serum recycle pond is provided in serum recycle pond
Device promotes fresh desulfurizer slurry to be sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotes serum recycle
Plasm PH value in pond is significantly raised；The high pH value desulfurization slurry in serum recycle pond is pumped by serum recycle to desulfurizing tower
Slurries spraying layer, slurries spraying layer, to lower spray, will contact after the atomization of high pH value desulfurization slurry with the flue gas adverse current flowed up,
Effectively desulfurization slurry droplet is enhanced to SO in flue gas2Quick absorption, achieve the effect that flue gas deep desulfuration；Meanwhile desulfurization
System liquid gas is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the operating cost of desulphurization system, and desulphurization system is more
Supernumerary segment energy；Flue gas enters high efficiency demister after deep desulfuration, the tiny desulfurization through carrying in high efficiency demister removing flue gas
Neat stress is formed after slurries droplet, then neat stress exports discharge desulfurizing tower from neat stress.
Beneficial effects of the present invention are as follows:
First, slurries oxidation pond is respectively set with serum recycle pond, the pressure oxidation reaction setting of desulfurization slurry is lower in pH value
Slurries oxidation pond in complete.PH value has a significant impact to the tool that carries out of oxidation reaction, and the present invention will force oxidation process to be arranged
It is completed in the slurries oxidation pond that plasm PH value is 5.0~6.0, the CaSO in this pH range3·1/2H2O solubility compared with
Greatly, oxidation rate is very fast, meanwhile, the CaSO in this pH range3·1/2H2O generates SO almost without decomposition2, be conducive to take off
The pressure oxidation reaction of sulphur slurries is gone on smoothly, and generates oxidation reaction product-gypsum (CaSO of high-quality4·2H2O crystal).
Second, the pH value of fresh desulfurizer slurry is higher, fresh desulfurizer slurry required for desulphurization system is all added
To serum recycle pond, the plasm PH value in serum recycle pond is caused to be apparently higher than the plasm PH value in slurries oxidation pond, slurries follow
The high pH value desulfurization slurry of cisterna ambiens is pumped by serum recycle to slurries spraying layer in desulfurizing tower, to meet the spray of slurries spraying layer
Desulfurization slurry droplet pH value with higher out, effectively enhances desulfurization slurry droplet to SO in flue gas2Quick absorption, reach
To the purpose of deep desulfuration；Meanwhile desulphurization system liquid-gas ratio is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces de-
The operating cost of sulphur system reaches the energy-efficient purpose of desulphurization system.
Third, desulphurization system and desulfurizing tower internal structure are relatively simple, equipment investment is lower, operational safety, easy to maintain；
Mark mentioned for desulfurization and reducing energy consumption project facilitates feasible, former desulfurizing tower tower body height and tower internal component do not change substantially,
Slurries oxidation pond and serum recycle pond are respectively set, corresponding connecting pipe transformation is carried out, high pH value desulfurization slurry can be realized
The purpose of sulfur dioxide in coal-fired flue-gas is removed in depth in liquid, reaches the ultra-clean discharge national standard of coal-fired flue-gas.
Detailed description of the invention
Fig. 1 is the principle assumption diagram of the first embodiment of the present invention.
Fig. 2 is the principle assumption diagram of the second embodiment of the present invention.
In figure mutually: 1- desulfurizing tower, the outlet of 2- neat stress, 3- high efficiency demister, 4- slurries spraying layer, the conveying of 5- slurries
Pump, the fresh desulfurization agent feeding device of 6-, 7- slurry circulating pump, 8- serum recycle pond, 9- serum recycle pond blender, 10- oxidation
Blower, 11- slurries oxidation pond, 12- slurries oxidation pond blender, 13- slurry discharge pump, 14- original gas inlet, 15- flue gas are equal
Discharge orifice plate, 16- vacuum strainer machine, 17- cyclone.
Specific embodiment
The present invention is further described below with reference to embodiment (attached drawing):
Embodiment 1
As shown in Figure 1, the device of sulfur dioxide includes being sequentially connected by pipeline in efficient removal coal-fired flue-gas of the invention
Desulfurizing tower 1, slurries oxidation pond 11, serum recycle pond 8, slurry circulating pump 7 and the fresh desulfurization being connected with serum recycle pond 8
Agent feeding device 6；The inside of the desulfurizing tower 1 sets gradually flue gas flow equalizing from former gas inlet 14 between neat stress outlet 2
Orifice plate 15, slurries spraying layer 4, high efficiency demister 3；The serum recycle pond 8 is connect by slurry circulating pump 7 and corresponding pipeline
Enter the slurries spraying layer 4 in desulfurizing tower 1；11 bottom of slurries oxidation pond by slurry discharge pump 13, pipeline successively with eddy flow
Device 17, vacuum strainer machine 16 are connected, and the slurries oxidation pond 11 is connected with oxidation fan 10 by corresponding pipeline.
Heretofore described slurries spraying layer can be set 2 to 5 layers.
Heretofore described slurries oxidation pond 11 is respectively set with serum recycle pond 8, and slurries oxidation pond 11 is arranged in desulfurization
The outside of desulfurizing tower 1 is arranged in the lower part of tower 1, serum recycle pond 8, and the liquid outlet of slurries oxidation pond 11 passes through slurry feeding pump 5
And corresponding pipeline is connected with the inlet in serum recycle pond 8；Slurries oxidation pond blender is provided in slurries oxidation pond 11
12, serum recycle pond blender 9 is provided in serum recycle pond 8.
As follows suitable for 1 technical process of embodiment: former flue gas flows up after entering desulfurizing tower 1 from former gas inlet 14,
First by flue gas flow equalizing orifice plate 15, promote flow of flue gas more uniform, meanwhile, desulfurization is covered with above flue gas flow equalizing orifice plate 15
Slurries liquid film, flue gas pass through desulfurization slurry liquid film when passing through flue gas flow equalizing orifice plate 15, have the function of pre- desulfurization and dedusting to flue gas；So
Afterwards, flue gas, which continues up, flows into desulfurization slurry spraying zone, slurries spraying layer 4 desulfurization slurry is atomized after to lower spray, with
The flue gas adverse current flowed up contacts, the SO in flue gas2It is desulfurized slurries droplet to fully absorb and reach deep desulfuration, desulfurization
Slurries droplet absorbs SO2Afterwards, it is passed down through flue gas flow equalizing orifice plate 15 and falls into slurries oxidation pond 11；Flue gas is sprayed by desulfurization slurry
Enter high efficiency demister 3 after area's deep desulfuration, the tiny desulfurization slurry droplet through carrying in high efficiency demister 3 sufficiently removing flue gas
After form neat stress, then neat stress from neat stress outlet 2 discharge desulfurizing towers 1.
Desulfurization slurry droplet absorbs SO in flue gas2After fall into slurries oxidation pond 11, meanwhile, oxidation fan 10 is by oxidation air
It is sent into slurries oxidation pond 11；It is provided with slurries oxidation pond blender 12 in slurries oxidation pond 11, promotes desulfurization slurry and oxidation empty
Gas is sufficiently mixed, and occurs to force oxidation reaction；Plasm PH value in slurries oxidation pond 11 is 5.0~6.0, which is conducive to take off
The dissolution and oxidation of sulphur slurries sulfite calcium and the gypsum (CaSO for generating high-quality4·2H2O crystal).Due to CaSO4·
2H2The specific gravity of O crystal is larger, forms thick slurry in 11 lower part of slurries oxidation pond, thick slurry is drained into through slurry discharge pump 13
Cyclone 17 is sent after being concentrated by cyclone 17 again to vacuum strainer machine 16, and finally formed solids is desulfurized gypsum.
The upper clear supernate of slurries oxidation pond 11 is sent by slurry feeding pump 5 to serum recycle pond 8, meanwhile, fresh desulfurizing agent
Fresh desulfurizer slurry is added into serum recycle pond 8 for feedway 6；The stirring of serum recycle pond is provided in serum recycle pond 8
Device 9 promotes fresh desulfurizer slurry to be sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotes serum recycle
Plasm PH value in pond 8 is significantly raised；The high pH value desulfurization slurry in serum recycle pond 8 is sent by slurry circulating pump 7 to desulfurizing tower 1
Interior slurries spraying layer 4, slurries spraying layer 4 high pH value desulfurization slurry is atomized after to lower spray, it is inverse with the flue gas that flows up
Stream contact, effectively enhances desulfurization slurry droplet to SO in flue gas2Quick absorption, achieve the effect that flue gas deep desulfuration；Together
When, desulphurization system liquid-gas ratio is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the operating cost of desulphurization system, takes off
Sulphur system is more energy saving.Flue gas enters high efficiency demister 3 after deep desulfuration, removes in flue gas and carries through high efficiency demister 3
Tiny desulfurization slurry droplet after form neat stress, then neat stress from neat stress outlet 2 discharge desulfurizing towers 1.
Embodiment 2
As shown in Fig. 2, the present embodiment difference from example 1 is that: the slurries oxidation pond 11 is arranged outside desulfurizing tower 1
Portion, and the liquid level of slurry of slurries oxidation pond 11 is lower than the bottom of desulfurizing tower 1；The slurries oxidation pond 11 and 8 phase of serum recycle pond
Neighbour is arranged and is equipped with public pool side；And phase is provided at the top of the public pool side between slurries oxidation pond 11 and serum recycle pond 8
Intercommunicated overflow groove.The present embodiment effectively reduces the equipment whole height of desulfurizing tower 1, is especially suitable for the de- of small exhaust gas volumn
Sulphur technique.
As follows suitable for 2 technical process of embodiment: former flue gas flows up after entering desulfurizing tower 1 from former gas inlet 14,
First by flue gas flow equalizing orifice plate 15, promote flow of flue gas more uniform, meanwhile, desulfurization is covered with above flue gas flow equalizing orifice plate 15
Slurries liquid film, flue gas pass through desulfurization slurry liquid film when passing through flue gas flow equalizing orifice plate 15, have the function of pre- desulfurization and dedusting to flue gas；So
Afterwards, flue gas, which continues up, flows into desulfurization slurry spraying zone, slurries spraying layer 4 desulfurization slurry is atomized after to lower spray, with
The flue gas adverse current flowed up contacts, the SO in flue gas2It is desulfurized slurries droplet to fully absorb and reach deep desulfuration, desulfurization
Slurries droplet absorbs SO2Afterwards, it is passed down through the bottom that flue gas flow equalizing orifice plate 15 falls into desulfurizing tower 1, then through slurries pipe gravity flow pipeline
Gravity flow enters slurries oxidation pond 11；Flue gas enters high efficiency demister 3 after desulfurization slurry spraying zone deep desulfuration, is efficiently removed
Neat stress is formed after the tiny desulfurization slurry droplet carried in the sufficiently removing flue gas of day with fog 3, then neat stress exports 2 from neat stress
Desulfurizing tower 1 is discharged.
The desulfurization slurry of 1 bottom of desulfurizing tower enters slurries oxidation pond 11 through the gravity flow of slurries pipe gravity flow pipeline, meanwhile, oxidation fan
Oxidation air is sent into slurries oxidation pond 11 by 10；It is provided with slurries oxidation pond blender 12 in slurries oxidation pond 11, promotes desulfurization
Slurries are sufficiently mixed with oxidation air, occur to force oxidation reaction；Plasm PH value in slurries oxidation pond 11 is 5.0~6.0, should
PH value be conducive to desulfurization slurry sulfite calcium dissolution and oxidation and generate the gypsum (CaSO of high-quality4·2H2O crystal).By
In CaSO4·2H2The specific gravity of O crystal is larger, forms thick slurry in 11 lower part of slurries oxidation pond, thick slurry is discharged through slurry
Pump 13 drains into cyclone 17, is sent again after being concentrated by cyclone 17 to vacuum strainer machine 16, finally formed solids is desulfurization
Gypsum.
Slurries oxidation pond 11 is disposed adjacent with serum recycle pond 8 and is equipped with public pool side, is provided at the top of public pool side excessive
Square hole is flowed, the upper clear supernate of slurries oxidation pond 11 crosses the gravity flow of the square hole at the top of public pool side and enters serum recycle pond 8, meanwhile,
Fresh desulfurizer slurry is added into serum recycle pond 8 for fresh desulfurization agent feeding device 6；Slurries are provided in serum recycle pond 8
Circulatory pool blender 9 promotes fresh desulfurizer slurry to be sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotees
Keep the plasm PH value in serum recycle pond 8 significantly raised；The high pH value desulfurization slurry in serum recycle pond 8 passes through slurry circulating pump 7
Send to the slurries spraying layer 4 in desulfurizing tower 1, slurries spraying layer 4 high pH value desulfurization slurry is atomized after to lower spray, with Xiang Shangliu
Dynamic flue gas adverse current contact, effectively enhances desulfurization slurry droplet to SO in flue gas2Quick absorption, reach flue gas deep desulfuration
Effect；Meanwhile desulphurization system liquid-gas ratio is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the fortune of desulphurization system
Row expense, desulphurization system are more energy saving.Flue gas enters high efficiency demister 3 after deep desulfuration, removes cigarette through high efficiency demister 3
Neat stress is formed after the tiny desulfurization slurry droplet carried in gas, then desulfurizing tower 1 is discharged from neat stress outlet 2 in neat stress.
Claims (5)
1. the device of sulfur dioxide in a kind of efficient removal coal-fired flue-gas, it is characterised in that: it includes being sequentially connected by pipeline
Desulfurizing tower, slurries oxidation pond, serum recycle pond, slurry circulating pump and the fresh desulfurizing agent that is connected with serum recycle pond supply
To device；The inside of the desulfurizing tower sets gradually flue gas flow equalizing orifice plate, slurries from former gas inlet between neat stress outlet
Spraying layer, high efficiency demister；The slurries in desulfurizing tower are accessed in the serum recycle pond by slurry circulating pump and corresponding pipeline
Spraying layer；Slurries oxidation bottom of pond portion by slurry discharge pump, corresponding pipeline successively with cyclone, vacuum strainer machine phase
Even, and the slurries oxidation pond is connected with oxidation fan by corresponding pipeline.
2. the device of sulfur dioxide in efficient removal coal-fired flue-gas according to claim 1, it is characterised in that: the slurries
The lower part of desulfurizing tower is arranged in oxidation pond, and the outside of desulfurizing tower is arranged in serum recycle pond, and the liquid outlet of slurries oxidation pond passes through
Slurry feeding pump and corresponding pipeline are connected with the inlet in serum recycle pond；Slurries oxidation pond is provided in slurries oxidation pond
Blender is provided with serum recycle pond blender in serum recycle pond.
3. the device of sulfur dioxide in efficient removal coal-fired flue-gas according to claim 1, it is characterised in that: the slurries
Oxidation pond and serum recycle pond are arranged at outside desulfurizing tower, and the liquid level of slurry of slurries oxidation pond is lower than the bottom of desulfurizing tower；
The slurries oxidation pond is disposed adjacent with serum recycle pond and is equipped with public pool side；And between slurries oxidation pond and serum recycle pond
Public pool side at the top of be provided with interconnected overflow groove；Slurries oxidation pond blender is provided in slurries oxidation pond,
Serum recycle pond blender is provided in serum recycle pond.
4. a kind of suitable for claim 1 or the technique of 2 described devices, it is characterised in that: the processing step is as follows:
A, former flue gas flows up after entering desulfurizing tower from former gas inlet, first by flue gas flow equalizing orifice plate, promotes flue gas stream
Move it is more uniform, meanwhile, be covered with desulfurization slurry liquid film above flue gas flow equalizing orifice plate, flue gas when flue gas flow equalizing orifice plate by passing through
Desulfurization slurry liquid film has the function of pre- desulfurization and dedusting to flue gas；Then, flue gas, which continues up, flows into desulfurization slurry spray
Area, slurries spraying layer desulfurization slurry is atomized after to lower spray, contacted with the flue gas adverse current flowed up, the SO in flue gas2Quilt
Desulfurization slurry droplet fully absorbs and reaches deep desulfuration, and desulfurization slurry droplet absorbs SO2Afterwards, it is passed down through flue gas flow equalizing hole
Plate falls into slurries oxidation pond；Flue gas enters high efficiency demister after desulfurization slurry spraying zone deep desulfuration, through high efficiency demister
Neat stress is formed after the tiny desulfurization slurry droplet sufficiently carried in removing flue gas, then neat stress is de- from neat stress outlet discharge
Sulphur tower；
B, desulfurization slurry droplet absorbs SO in flue gas2After fall into slurries oxidation pond, meanwhile, oxidation fan by oxidation air be sent into starch
Liquid oxidation pond；It is provided with slurries oxidation pond blender in slurries oxidation pond, desulfurization slurry is promoted to be sufficiently mixed with oxidation air, sends out
It is raw to force oxidation reaction；Plasm PH value in slurries oxidation pond is 5.0~6.0, which is conducive to desulfurization slurry sulfite
The dissolution and oxidation of calcium and the gypsum for generating high-quality, i.e. CaSO4·2H2O crystal；Due to CaSO4·2H2The specific gravity of O crystal compared with
Greatly, thick slurry is formed in slurries oxidation pond lower part, thick slurry drains into cyclone through slurry discharge pump, is concentrated by cyclone
It is sent again afterwards to vacuum strainer machine, finally formed solids is desulfurized gypsum；
The upper clear supernate of c slurries oxidation pond is sent by slurry feeding pump to serum recycle pond, meanwhile, fresh desulfurization agent feeding device
Fresh desulfurizer slurry is added into serum recycle pond；It is provided with serum recycle pond blender in serum recycle pond, promotes fresh
Desulfurizer slurry is sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotes the slurries PH in serum recycle pond
Value is significantly raised；The high pH value desulfurization slurry in serum recycle pond pumps the slurries spraying layer to desulfurizing tower by serum recycle,
Slurries spraying layer, to lower spray, will be contacted with the flue gas adverse current flowed up, effectively be enhanced after the atomization of high pH value desulfurization slurry
Desulfurization slurry droplet is to SO in flue gas2Quick absorption, achieve the effect that flue gas deep desulfuration；Meanwhile desulphurization system liquid-gas ratio
It is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the operating cost of desulphurization system, and desulphurization system is more energy saving；Cigarette
Gas enters high efficiency demister after deep desulfuration, after the tiny desulfurization slurry droplet through carrying in high efficiency demister removing flue gas
Neat stress is formed, then neat stress exports discharge desulfurizing tower from neat stress.
5. a kind of suitable for claim 1 or the technique of 3 described devices, it is characterised in that: the processing step is as follows:
A, former flue gas flows up after entering desulfurizing tower from former gas inlet, first by flue gas flow equalizing orifice plate, promotes flue gas stream
Move it is more uniform, meanwhile, be covered with desulfurization slurry liquid film above flue gas flow equalizing orifice plate, flue gas when flue gas flow equalizing orifice plate by passing through
Desulfurization slurry liquid film has the function of pre- desulfurization and dedusting to flue gas；Then, flue gas, which continues up, flows into desulfurization slurry spray
Area, slurries spraying layer desulfurization slurry is atomized after to lower spray, contacted with the flue gas adverse current flowed up, the SO in flue gas2Quilt
Desulfurization slurry droplet fully absorbs and reaches deep desulfuration, and desulfurization slurry droplet absorbs SO2Afterwards, it is passed down through flue gas flow equalizing hole
Plate falls into the bottom of desulfurizing tower, then enters slurries oxidation pond through the gravity flow of slurries pipe gravity flow pipeline；Flue gas is sprayed by desulfurization slurry
Enter high efficiency demister after area's deep desulfuration, after high efficiency demister sufficiently removes the tiny desulfurization slurry droplet carried in flue gas
Neat stress is formed, then neat stress exports discharge desulfurizing tower from neat stress；
B, the desulfurization slurry of desulfurization tower bottom enters slurries oxidation pond through the gravity flow of slurries pipe gravity flow pipeline, meanwhile, oxidation fan is by oxygen
Change air and is sent into slurries oxidation pond；It is provided with slurries oxidation pond blender in slurries oxidation pond, promotes desulfurization slurry and oxidation empty
Gas is sufficiently mixed, and occurs to force oxidation reaction；Plasm PH value in slurries oxidation pond is 5.0~6.0, which is conducive to desulfurization
The dissolution and oxidation of slurries sulfite calcium and the gypsum for generating high-quality, i.e. CaSO4·2H2O crystal；Due to CaSO4·2H2O
The specific gravity of crystal is larger, forms thick slurry in slurries oxidation pond lower part, and thick slurry drains into cyclone through slurry discharge pump, leads to
It is sent again after crossing cyclone concentration to vacuum strainer machine, finally formed solids is desulfurized gypsum；
C, slurries oxidation pond is disposed adjacent with serum recycle pond and is equipped with public pool side, is provided with overflow side at the top of public pool side
Hole, the upper clear supernate of slurries oxidation pond cross the gravity flow of the square hole at the top of public pool side and enter serum recycle pond, meanwhile, fresh desulfurization
Fresh desulfurizer slurry is added into serum recycle pond for agent feeding device；The stirring of serum recycle pond is provided in serum recycle pond
Device promotes fresh desulfurizer slurry to be sufficiently mixed with slurries in pond, and the higher fresh desulfurizer slurry of pH value promotes serum recycle
Plasm PH value in pond is significantly raised；The high pH value desulfurization slurry in serum recycle pond is pumped by serum recycle to desulfurizing tower
Slurries spraying layer, slurries spraying layer, to lower spray, will contact after the atomization of high pH value desulfurization slurry with the flue gas adverse current flowed up,
Effectively desulfurization slurry droplet is enhanced to SO in flue gas2Quick absorption, achieve the effect that flue gas deep desulfuration；Meanwhile desulfurization
System liquid gas is smaller, hence it is evident that the energy consumption for reducing slurry circulating pump effectively reduces the operating cost of desulphurization system, and desulphurization system is more
Supernumerary segment energy；Flue gas enters high efficiency demister after deep desulfuration, the tiny desulfurization through carrying in high efficiency demister removing flue gas
Neat stress is formed after slurries droplet, then neat stress exports discharge desulfurizing tower from neat stress.
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| CN109985498A (en) * | 2019-04-17 | 2019-07-09 | 华北水利水电大学 | A kind of ultra-clean system and technique for removing sulfur dioxide in coal-fired flue-gas |
| CN110756034A (en) * | 2019-09-16 | 2020-02-07 | 浙江天蓝环保技术股份有限公司 | High-sulfur flue gas deep purification system and process |
| CN113357659A (en) * | 2021-06-05 | 2021-09-07 | 安徽科力德能源环境科技有限公司 | Wet flue gas desulfurization and oxidation monitoring and thermal power plant mixed sulfur co-combustion system and method |
| CN117398821A (en) * | 2023-10-19 | 2024-01-16 | 江苏龙泰环保设备制造有限公司 | Wet electric purification system for sulfur-containing tail gas desulfurization after incineration |
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