CN107233792A - A kind of high solid-gas ratio dehumidification desulfurization general character method and system based on micro mist lime stone - Google Patents
A kind of high solid-gas ratio dehumidification desulfurization general character method and system based on micro mist lime stone Download PDFInfo
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- CN107233792A CN107233792A CN201710552526.4A CN201710552526A CN107233792A CN 107233792 A CN107233792 A CN 107233792A CN 201710552526 A CN201710552526 A CN 201710552526A CN 107233792 A CN107233792 A CN 107233792A
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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
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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Abstract
A kind of high solid-gas ratio dehumidification desulfurization general character method and system based on micro mist lime stone of the present invention, the buffered storehouse of micro mist lime stone, metering system enters humidification mixing system, enter batch mixing humidification system simultaneously also has atomized water and circulation desulfurization ash, micro mist lime stone is fully humidified in humidification mixing system, activation, homogenizing, improve desulphurization reaction activity, fluidize and convey through fluid-bed, material is dispersed throughout into high solid-gas ratio reactor simultaneously for conveying, make random turbulent motion with heat smoke in reactor, free humidification water in motion process in micro mist lime stone is evaporated by obvious heat of smoke, micro mist limestone particle surface gradually forms the preferable temperature of desulphurization reaction and damp condition, SO in flue gas2With particulate lime stone reaction generation desulfurated plaster, flue gas is discharged into air after purification；Smoke desulfurization efficiency >=95% of the present invention, and reduced investment, waste water zero are produced, and flue gas hydrofuge is small, and desulfurated plaster moisture content≤3%, achievable solid wastes recycling is effectively utilized.
Description
Technical field
The invention belongs to flue gas desulfurization technique field, more particularly to a kind of high solid-gas ratio dehumidification based on micro mist lime stone takes off
Sulphur general character method and system.
Background technology
SO2A large amount of discharges can environment and the mankind be produced with great harm, present China be to be only second to Europe and North America
The third-largest Acid Rain Zone, acid rain area constitutes about the 30% of land resources.
As environmental problem is increasingly protruded in the world, countries in the world also increase the power of environmental improvement one after another
Degree.Flue gas desulfurization technique (FGD)-wet desulphurization is current control SO2Most common technology and method.
Although such desulfurization technology desulfuration efficiency is higher, the following defect of generally existing：(1) in terms of environmental protection effect：Wet method
Desulfidation tail gas temperature is low, humidity is high and carries the secondary pollutions such as grey, the newly-generated sulphate particle of the duff remained, there is expert
Research shows that such material is discharged into air and easily forms aerosol to aggravate city haze；(2) in terms of technology：Wet method takes off
Sulphur technology generally existing serum producing system is complicated, absorbs nozzle for liquid and easily blocks, weares and teares, the easy fouling in absorption tower is also easy to produce desulfurization
The drawbacks of waste water；(3) in terms of solid wastes recycling：The desulfurated plaster of wet desulphurization generation, after press filtration moisture content still 10~
15% or so, it is limited as the potentiality of large solid waste utilization of resources；(4) investment and operating cost aspect：Existing wet method takes off
Sulphur technology generally existing floor space is big, initial investment and the high shortcoming of operation and maintenance cost.
The content of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of height based on micro mist lime stone
Solid-gas ratio dehumidification desulfurization general character method and system, it is pre- by humidification, activation, homogenizing etc. using micro mist lime stone as desulfurizing agent
Processing increases substantially reactivity, and the smoke desulfurization efficiency (>=98%) being equal with wet method can be issued in dehumidification condition, takes off
Sulphur waste water zero has the characteristics of tail end humidity of flue gas is low while generation, can be prevented effectively from what wet flue gas was formed to city haze
Desulfurated plaster ratio >=90%, moisture content≤2% in negative effect, waste residue, can be directly as high-performance reclaimed gypsum in building materials
Realize extensive recycling in field.
To achieve these goals, the technical solution adopted by the present invention is：
A kind of high solid-gas ratio dehumidification desulfurization general character method based on micro mist lime stone, comprises the following steps：
The first step：Micro mist lime stone is stored in material buffer storehouse；
Second step：Material buffer storehouse divides into metering system, and micro mist lime stone is measured, and batch mixing is entered after metering and is humidified
System, while also having circulation desulfurization ash and humidification water into batch mixing humidification system, in batch mixing humidification system, material is fully mixed
Close and be humidified；
3rd step：Humidification blended stock enters high solid-gas ratio reactor after fully being fluidized through fluid-bed；
4th step：Material and smoke components mixing in high solid-gas ratio reactor, moisture is under heat smoke effect by liquid
It is changed into gaseous state, certain wet environment, SO is formed in particle surface2With micro mist lime stone reaction generation desulfurization stone under this wet environment
Cream, reaches the purpose of desulfurization；
5th step：Material forms Desulphurization after being reacted in high solid-gas ratio reactor and enters first separator with flue gas,
It is separated in first separator interior material and enters back grey surge bunker；Partial material enters dust collecting system with flue gas, through filtering,
Collected after deashing and enter back grey surge bunker；Flue gas is discharged into air through air-introduced machine after purification；
6th step：It is humidified into the circulation desulfurization ash for returning grey surge bunker after metering system metering under storehouse into batch mixing and is
System, is mixed jointly with desulfurizing agent and water, so far technique formation circulation；
7th step：Circulation desulfurization ash carries out arranging outside Desulphurization returning when grey surge bunker reaches high charge level, forms final outer
Arrange Desulphurization.
The particle mean size of the particulate lime stone is less than material water ratio control after humidification in 6 μm, the batch mixing humidification system
System is 4~6%, and the flue-gas temperature of the entrance high solid-gas ratio reactor is not less than 150 DEG C, goes out the flue gas of high solid-gas ratio reactor
Temperature is not higher than 65 DEG C, and humidity is not more than dust concentration highest 3000g/Nm inside 50%, the high solid-gas ratio reactor gas3,
The separative efficiency of the just separator is 50~90%, and the final outer grey moisture of sulphur of getting rid of is not more than 3%.
Present invention also offers a kind of high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone, including：
Material buffer storehouse for storing micro mist lime stone；
Time grey surge bunker for storing circulation desulfurization ash；
For the metering system measured to the micro mist lime stone and circulation desulfurization ash of sending into batch mixing humidification system；
For the batch mixing humidification system that the micro mist lime stone and circulation desulfurization ash are mixed and be humidified；
For the water system supplied water to the batch mixing humidification system；
For making humidification by mixing of gas material carry out the high solid-gas ratio reactor of reaction desulfuration, the high solid-gas ratio reaction with flue gas
Device is connected with batch mixing humidification system and flue；
Be connected with the exhanst gas outlet of the high solid-gas ratio reactor be used for carry out feed separation first separator and gather dust
System, the just separator and the material outlet of dust collecting system are connected with returning grey surge bunker；
And, the air-introduced machine that power is provided is connected with the dust collecting system exhanst gas outlet.
Under the material buffer storehouse set strength activation system, prevent micro mist lime stone it is hardened, reunite cause can not be just
Normal discharging.
The metering system is adjustable metered system, and metering method is measured for spiral, or is closed belt metering.
The batch mixing humidification system is humidified for online batch mixing, and process is continuous.
Present system may also include：
For the fluid-bed for being fluidized the humidification by mixing of gas material before feeding high solid-gas ratio reactor.
The fluid-bed fluidizes for strength, and material is in suspended state after fluidisation.
The dust collecting system is bag collector, such as double filtering overlay film bag filters.
Compared with prior art, the beneficial effects of the invention are as follows：
1) desulfuration efficiency is high；
2) invest small；
3) waste water zero is produced；
4) flue gas moisture content is small；
5) Desulphurization moisture content is low.
To sum up, inventive desulfurization efficiency can reach more than 95%, have desulfuration efficiency height, reduced investment, production without waste water, flue gas
Hydrofuge is small, Desulphurization moisture content is low.
Brief description of the drawings
Fig. 1 is flue gas desulfurization process block diagram of the invention.
Fig. 2 is the structural representation of flue gas desulphurization system form one of the invention.
Fig. 3 is the smoke desulfurization efficiency and the relation of calcium sulfur ratio in the experiment of high solid-gas ratio dehumidification desulfurization pilot scale platform.
Fig. 4 is the smoke desulfurization efficiency and the relation of humidity in the experiment of high solid-gas ratio dehumidification desulfurization pilot scale platform.
Fig. 5 is smoke desulfurization efficiency and SO during high solid-gas ratio dehumidification desulfurization pilot scale platform is tested2The relation of entrance concentration.
Embodiment
Describe embodiments of the present invention in detail with reference to the accompanying drawings and examples.
As shown in figure 1, a kind of high solid-gas ratio dehumidification desulfurization general character method based on micro mist lime stone, comprises the following steps：
The first step：Desulfurizing agent micro mist lime stone is stored in material buffer storehouse, micro mist lime stone is ultra-fine calcium-based desulfurization
Agent, its mineral are CaCO3, particle mean size is less than 6 μm.
Second step：Surge bunker divides into metering system, and desulfurizing agent is measured, and batch mixing humidification system is entered after metering, together
When into batch mixing humidification system also have circulation desulfurization ash and humidification water, in batch mixing humidification system, material be adequately mixed and
Humidification, batch mixing humidification system is humidified for online batch mixing, and process is continuous, and material water ratio control is in 4~6%, material after humidification
Mobility is preferable.
3rd step：Humidification blended stock enters high solid-gas ratio reactor after fully being fluidized through fluid-bed, fluid-bed is strength stream
Change, material is in suspended state after fluidisation.
4th step：Material and temperature are not less than 150 DEG C of smoke components mixing in high solid-gas ratio reactor, and moisture is in warm
Gaseous state is changed into from liquid under flue gas effect, certain wet environment, SO are formed about in particle surface2With micro mist under this wet environment
Lime stone reaction generation solid matter, reaches the purpose of desulfurization.
5th step：Material is in high solid-gas ratio reactor reaction, and height is solid to be reached as high as than dust concentration inside reactor gas
3000g/Nm3, Desulphurization is formed after reaction and enters first separator with flue gas, first separator interior point material be separated into
Enter back grey surge bunker, its separative efficiency of first separator is 50~90%；Partial material enters dust collecting system with flue gas, passes through
Collected after filter, deashing and enter back grey surge bunker, dust collecting system is bag collector, such as the high rate dust-precipitator of double overlay films.Only
Flue-gas temperature is not higher than 65 DEG C after change, and humidity is not more than 50%, and air is discharged into through air-introduced machine.
6th step：It is humidified into the circulation desulfurization ash for returning grey surge bunker after metering system metering under storehouse into batch mixing and is
System, is mixed jointly with desulfurizing agent and water, so far technique formation circulation.Metering system can be adjustable metered device, metering method
Can be spiral metering, or closed belt is measured or other adjustable dynamic measuring modes.
7th step：Circulation desulfurization ash carries out arranging outside Desulphurization when reaching high charge level in time grey surge bunker, is formed finally
Outer row's Desulphurization, the moisture of outer row's Desulphurization is not more than 3%, and system desulfuration efficiency is more than 95%.
Invention also provides corresponding system, including following form.
As shown in Fig. 2 one of form for present system：
Micro mist lime stone is stored in material buffer storehouse 01, and storehouse divides into manually gate valve 02, and manually gate valve 02 is in normal
Open state, maintenance is closed when follow-up system goes wrong.The bottom of manually gate valve 02 set by frequency conversion revolving plow reclaimer 03 and
The metering system that spiral weighing balance 04 is constituted, carries out entering humidification blender 05 after accurate measurement, while desulfurization is followed to desulfurizing agent
Ring ash and humidification water also enter humidification blender 05, and material is sufficiently mixed, is humidified, activates laggard become a mandarin in humidification blender 05
Change groove 06, fluid-bed power comes from fluidized air blower 07.Material is delivered to seasoning spreading box 08 through fluid-bed 06, after being disperseed by seasoning spreading box 08
Into high solid-gas ratio reactor 09.Material and smoke components mixing in high solid-gas ratio reactor 09, moisture are acted in heat smoke
Under gaseous state is changed into from liquid, certain wet environment, SO are formed about in particle surface2With ultra-fine calcium-based material under this wet environment
Reaction generation solid matter, reaches the purpose of desulfurization.Circulating ash is formed after reactive desulfurizing agent and is introduced into just separator 11 with the wind,
Partial material is separated in first separator 11, and being discharged into back grey surge bunker 15 through revolving plow reclaimer 12 carries out buffer storage.Its remaining part
Desulfurizing agent is divided to enter bagroom 13 together with the wind, desulfurizing agent is all collected in bagroom 13, is fed through impeller
Machine 14 enters back grey surge bunker 15.Storehouse divides into manually gate valve 16, and it is in normally open position, and lower flow is closed when breaking down
Maintenance.The bottom of manually gate valve 16 sets extra quality road, sets electric brake plate valve 18 to carry out the outer row of Desulphurization all the way, sets all the way
Electric brake plate valve 17 carries out the disconnection control of Desulphurization circulation.The bottom of electric brake plate valve 17 set by frequency conversion revolving plow reclaimer 19 and
Screw feeder claims the metering system of 20 compositions, and it carries out entering humidification blender 05 after accurate measurement to circulation desulfurization ash, is formed
Desulphurization is circulated.Gas after being handled through bagroom 13 is discharged into air by air-introduced machine 21.
Inventive desulfurization efficiency is with calcium sulfur ratio, humidity and SO2Entrance concentration experiment is as follows：
In 180 ± 10 DEG C of smoke inlet temperature, exhaust gas volumn 300m3Under conditions of/h, different calcium sulfur ratios, DIFFERENT WET are chosen
Degree, difference SO2Entrance concentration is tested in high solid-gas ratio dehumidification desulfurization pilot scale platform, is investigated smoke desulfurization efficiency and is become with above-mentioned factor
The relation of change, such as Fig. 3, Fig. 4 and Fig. 5.As calcium sulfur ratio by 50 increases to 250, flue gas SO2Concentration is by 72mg/Nm3It is reduced to
5mg/Nm3, desulfuration efficiency brought up to 99.5% by 93%.When calcium sulfur ratio reaches 250, lime stone has been reached --- gypsum
The smoke desulfurization efficiency of method, fully meets the requirement of ultra-clean discharge.In calcium sulfur ratio under the same conditions, humidity is increased to by 16%
39%, smoke desulfurization efficiency increases to 96% by 85%, but smoke desulfurization efficiency growth trend slows down if humidity continues to increase.It is existing
Smoke moisture is advisable no more than 50% under the operating mode of field.With the increase of sulfur dioxide in flue gas concentration, outlet drain value is stablized
It is maintained at 10mg/Nm3Below.
Claims (10)
1. a kind of high solid-gas ratio dehumidification desulfurization general character method based on micro mist lime stone, it is characterised in that comprise the following steps：
The first step：Micro mist lime stone is stored in material buffer storehouse；
Second step：Material buffer storehouse divides into metering system, and micro mist lime stone is measured, and batch mixing humidification system is entered after metering
System, while also having circulation desulfurization ash and humidification water into batch mixing humidification system, in batch mixing humidification system, material is sufficiently mixed
And humidification；
3rd step：Humidification blended stock enters high solid-gas ratio reactor after fully being fluidized through fluid-bed；
4th step：Material and smoke components mixing in high solid-gas ratio reactor, moisture are changed under heat smoke effect from liquid
Gaseous state, forms certain wet environment, SO in particle surface2With micro mist lime stone reaction generation desulfurated plaster under this wet environment,
Reach the purpose of desulfurization；
5th step：Material forms Desulphurization after being reacted in high solid-gas ratio reactor and enters first separator with flue gas, first
Separator interior material, which is separated, enters back grey surge bunker；Partial material enters dust collecting system with flue gas, through filtering, deashing
Collect afterwards and enter back grey surge bunker；Flue gas is discharged into air through air-introduced machine after purification；
6th step：Enter batch mixing humidification system after being measured into the circulation desulfurization ash for returning grey surge bunker through metering system under storehouse, with
Desulfurizing agent and water are mixed jointly, so far technique formation circulation；
7th step：Circulation desulfurization ash carries out arranging outside Desulphurization when time grey surge bunker reaches high charge level, forms finally outer and gets rid of
Sulphur ash.
2. the high solid-gas ratio dehumidification desulfurization general character method based on micro mist lime stone according to claim 1, it is characterised in that institute
The particle mean size of particulate lime stone is stated less than 6 μm, material water ratio is controlled 4~6% after being humidified in the batch mixing humidification system,
The flue-gas temperature of the entrance high solid-gas ratio reactor is not less than 150 DEG C, and the flue-gas temperature for going out high solid-gas ratio reactor is not higher than
65 DEG C, humidity is not more than dust concentration highest 3000g/Nm inside 50%, the high solid-gas ratio reactor gas3, it is described just to separate
The separative efficiency of device is 50~90%, and the final outer grey moisture of sulphur of getting rid of is not more than 3%.
3. a kind of high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone, it is characterised in that including：
Material buffer storehouse for storing micro mist lime stone；
Time grey surge bunker for storing circulation desulfurization ash；
For the metering system measured to the micro mist lime stone and circulation desulfurization ash of sending into batch mixing humidification system；
For the batch mixing humidification system that the micro mist lime stone and circulation desulfurization ash are mixed and be humidified；
For the water system supplied water to the batch mixing humidification system；
For making humidification by mixing of gas material and flue gas carry out the high solid-gas ratio reactor of reaction desulfuration, the high solid-gas ratio reactor with
Batch mixing humidification system and flue connection；
The first separator and dust collecting system that are used to carry out feed separation being connected with the exhanst gas outlet of the high solid-gas ratio reactor,
The just separator and the material outlet of dust collecting system are connected with returning grey surge bunker；
And, the air-introduced machine that power is provided is connected with the dust collecting system exhanst gas outlet.
4. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 3, it is characterised in that institute
State under material buffer storehouse setting strength activation system, prevent that micro mist lime stone is hardened, reunite cause can not normally discharging.
5. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 3, it is characterised in that institute
Metering system is stated for adjustable metered system, metering method is measured for spiral, or be closed belt metering.
6. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 3, it is characterised in that institute
State batch mixing humidification system to be humidified for online batch mixing, process is continuous.
7. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 3, it is characterised in that also
Including：
For the fluid-bed for being fluidized the humidification by mixing of gas material before feeding high solid-gas ratio reactor.
8. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 7, it is characterised in that institute
State fluid-bed to fluidize for strength, material is in suspended state after fluidisation.
9. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 7, it is characterised in that institute
Dust collecting system is stated for bag collector.
10. the high solid-gas ratio dehumidification desulfurization general character system based on micro mist lime stone according to claim 7, it is characterised in that
The bag collector is double filtering overlay film bag filters.
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| CN201710552526.4A CN107233792B (en) | 2017-08-10 | 2017-08-10 | High-solid-gas-ratio dehumidification and desulfurization commonality method and system based on micro powder limestone |
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| CN201710552526.4A CN107233792B (en) | 2017-08-10 | 2017-08-10 | High-solid-gas-ratio dehumidification and desulfurization commonality method and system based on micro powder limestone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101259364A (en) * | 2008-04-16 | 2008-09-10 | 中冶华天工程技术有限公司 | Wet desulphurization technique for sintered flue gas |
| CN101357298A (en) * | 2007-07-31 | 2009-02-04 | 黄盛珠 | Circulating fluid bed flue gas desulfurization technique and device |
| WO2010139168A1 (en) * | 2009-06-03 | 2010-12-09 | 江苏博际环保工程有限公司 | Digestion circulating fluidized bed flue gas desulfurization method and device |
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2017
- 2017-08-10 CN CN201710552526.4A patent/CN107233792B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357298A (en) * | 2007-07-31 | 2009-02-04 | 黄盛珠 | Circulating fluid bed flue gas desulfurization technique and device |
| CN101259364A (en) * | 2008-04-16 | 2008-09-10 | 中冶华天工程技术有限公司 | Wet desulphurization technique for sintered flue gas |
| WO2010139168A1 (en) * | 2009-06-03 | 2010-12-09 | 江苏博际环保工程有限公司 | Digestion circulating fluidized bed flue gas desulfurization method and device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108455678A (en) * | 2018-04-27 | 2018-08-28 | 北京科技大学 | The method that waste material combines the desulfurization of limestone/lime-gypsum method and prepares calcium ferrite |
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