CN106823712A - Double de- Dual-alkali smoke desulfurization devices and method - Google Patents

Double de- Dual-alkali smoke desulfurization devices and method Download PDF

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Publication number
CN106823712A
CN106823712A CN201710083795.0A CN201710083795A CN106823712A CN 106823712 A CN106823712 A CN 106823712A CN 201710083795 A CN201710083795 A CN 201710083795A CN 106823712 A CN106823712 A CN 106823712A
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CN
China
Prior art keywords
alkali
gypsum
dehydration
equipment
liquid
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Pending
Application number
CN201710083795.0A
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Chinese (zh)
Inventor
邹恩林
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Shanghai Silver Environmental Protection Technology Co Ltd
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Shanghai Silver Environmental Protection Technology Co Ltd
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Priority to CN201710083795.0A priority Critical patent/CN106823712A/en
Publication of CN106823712A publication Critical patent/CN106823712A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502Sulfur 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • B01D53/501Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/504Sulfur 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77Liquid phase processes
    • B01D53/79Injecting reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/96Regeneration, reactivation or recycling of reactants
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/30Alkali metal compounds
    • B01D2251/304Alkali metal compounds of sodium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/604Hydroxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/60Inorganic bases or salts
    • B01D2251/606Carbonates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases

Abstract

The present invention relates to double de- Dual-alkali smoke desulfurization devices and method.Including absorption tower, alkali lye recycle unit, alkali liquid regeneration equipment, technique water tank, the alkali lye of regeneration is delivered to absorption tower and is sprayed by alkali lye recycle unit, alkali liquid regeneration equipment receives the material from absorbing tower bottom and regenerates alkali lye and gypsum deposition with lime reaction, also include dehydration equipment, reclaimer, dehydration equipment is received from the gypsum deposition in alkali liquid regeneration equipment, reclaimer receives the dehydrated gypsum from dehydration equipment and the process water from technique water tank carries out dilatation washing, regenerating unit receives from the abjection liquid deviate from first in dehydration equipment, second dehydration is carried out in the gypsum feeding dehydration equipment that dilatation is washed in the outlet of reclaimer, gypsum storehouse receives the gypsum of the second dehydration from dehydration equipment, circulatory pool receive from dehydration equipment in secondary abjection abjection liquid.Recycle of alkali liquor rate of the present invention is high, does not have the solid formations such as gypsum to return.

Description

Double de- Dual-alkali smoke desulfurization devices and method
[technical field]
The present invention relates to flue gas desulfurization apparatus and method, specifically a kind of double de- Dual-alkali smoke desulfurization devices and side Method.
[background technology]
At present, people produce substantial amounts of industrial smoke, flue gas when using the burning of the organic matter fuels such as coal to obtain energy In containing content sulfur dioxide composition very high, severe contamination is caused to environment.There is a kind of double alkali method desulfurizing technical matters to equip, First using the soda solution such as sodium carbonate or NaOH are sprayed in absorption tower, with sulfur dioxide haptoreaction, make sulfur dioxide Etc. harmful components conversion chemical conversion sodium hydrogensulfite, then in regenerated reactor by sodium hydrogensulfite and cheap calcium hydroxide reaction, Generation calcium bisulfite, displaces original soda, while being passed through air oxidation to regenerated reactor, calcium bisulfite is generated sulfuric acid Calcium, most carries out separation of solid and liquid through precipitation or through machinery afterwards, and aqueous 10% or so calcium sulfate separately does it and uses or abandon.By regeneration The soda for displacing participates in absorption cycle again, reaches saving high value soda, reduces the mesh ground of desulfurization operation cost;
This double alkali method desulfurizing technology originally, is to substitute limestone-gypsum due to being claimed as non-scaling, not blocking Method desulphurization system produces serious scale and the alternative for blocking, and constructed substantial amounts of this kind of engineering project equipment.
But in actual application, due to generate calcium carbonate in containing 10% or so moisture content, even if in gypsum Soda is replaced out completely, and still contains some soda in gypsum institute water content, as gypsum is abandoned, gypsum institute Soda in water content is also wasted or abandons simultaneously, causes the cost of desulfurizing agent still higher, while also being also resulted in environment Secondary pollution.
Particularly, due to be usually in actual application, during due to separation of solid and liquid using settling tank step by step precipitate into Row separation of solid and liquid, two-phase medium is difficult to be kept completely separate, still containing the solid phase particles such as gypsum in the circulated sprinkling liquid of return, cause be The serious scale and blocking of system equipment and pipeline, system equipment are not normally functioning, and greatly puzzlement and fiber crops are brought to user Tired, in the double alkali method desulfurizing engineering project of fortune, all there is this in the overwhelming majority for China.
[content of the invention]
The purpose of the present invention is to remove the alkali lye in gypsum contained humidity, increases separation and the organic efficiency of alkali lye.
To achieve these goals, a kind of double de- Dual-alkali smoke desulfurization devices are designed, including absorption tower, alkali lye circulation set The alkali lye of regeneration is delivered to absorption tower and is sprayed by standby, alkali liquid regeneration equipment, technique water tank, alkali lye recycle unit, alkali liquid regeneration Equipment receives the material from absorbing tower bottom and regenerates alkali lye and gypsum deposition with lime reaction,
Also include dehydration equipment, reclaimer, dehydration equipment is received from the gypsum deposition in alkali liquid regeneration equipment, reclaimed Equipment receives the dehydrated gypsum from dehydration equipment and the process water from technique water tank carries out dilatation washing, and regenerating unit connects In the gypsum feeding dehydration equipment for being washed dilatation by the outlet from the abjection liquid deviate from first in dehydration equipment, reclaimer Second dehydration is carried out, gypsum storehouse receives the gypsum of the second dehydration from dehydration equipment, and circulatory pool receives from dehydration equipment Secondary abjection abjection liquid.
The equipment also has following optimization structure:
Described alkali lye recycle unit includes circulatory pool, the abjection liquid that circulatory pool passes through the secondary abjection of conduit acceptor, circulation Pond is connected by being provided with the pipeline of pump with the spray equipment on absorption tower and delivers to absorption tower with the alkali lye for regenerating and sprayed, described Circulatory pool on be also associated with alkali tank.
Alkali liquid regeneration equipment is connected to receive from absorbing tower bottom by the outlet that pipeline is opened up with absorption tower bottom Material.
Described alkali liquid regeneration device includes that regenerated reactor, lime stock tank, lime storage tank, lime stock tank receive from lime storage Process water in the lime and technique water tank of tank is mixed, and lime stock tank is connected by being provided with the pipeline of pump with regenerated reactor With in conveying lime white to regenerated reactor, by the blower fan outside connection being passed through air in regenerated reactor.
Described regenerated reactor is connected to convey gypsum deposition, pipeline by being provided with the pipeline of pump with the import of dehydration equipment Entrance point be arranged on the bottom of regenerated reactor.
Described retracting device be with stirring recycling can, recycling can by the pipeline with pump be connected with dehydration equipment with Second dehydration is carried out in the gypsum feeding dehydration equipment that dilatation is washed.
Described alkali lye recycle unit also receives from the material for absorbing tower bottom.
Present invention additionally comprises a kind of double de- dual alkali scrubbing FGD process methods, the step of regenerate alkali lye using lime and alkali The circulation step of liquid, gypsum deposition is produced after lime regeneration alkali lye, also including the recycling for alkali lye in gypsum deposition, is adopted With above-mentioned device, following steps are specifically included:
A. reacted gypsum deposition feeding dehydration equipment is dehydrated first in generating apparatus again,
B. the abjection liquid deviate from is returned in generating apparatus again, and the gypsum feeding retracting device after being dehydrated first is carried out with process water The gypsum liquid of dilatation washing is mixed to form,
C. second dehydration is carried out in gypsum liquid feeding dehydration equipment,
E. the secondary abjection liquid of second dehydration sends into circulatory pool, the gypsum feeding gypsum storehouse of abjection.
The sulfur method also has following prioritization scheme:
Described alkali lye circulation step includes that the alkali lye in alkali lye recycle unit is delivered into absorption tower carries out spray removing cigarette Sulfur dioxide in gas.
The step of described utilization lime regenerates alkali lye receives the material from absorbing tower bottom including alkali liquid regeneration equipment Alkali lye and gypsum deposition are regenerated with lime reaction.
The present invention compared with prior art, has the following advantages that:
Above-described double de- double alkali method desulfurizing technology device, it is dilute that one of advantage is that the recycling can set up adds water Technique is released, the structure type of gypsum dehydration (double de-) twice is completed, it is left that original desulfurated plaster moisture content is typically about 10% The right side, gypsum water content about 100kg or so per ton, it is aqueous in alkali lye content concn based on 2.5%, gypsum per ton contain soda About 2.5kg or so, one ton of desulfurated plaster volume is 0.5 cubic metre, and the quality of gypsum and process water is pressed in recycle of alkali liquor tank Than being 1:1 amount of water is diluted cleaning, and alkali lye of one ton of desulfurated plaster containing water loss will be reduced to from original 2.5kg 0.42kg or so, the cost of desulfurization soda reduces more than 80%.
Described double de- double alkali method desulfurizing technology device, its another advantage is that the product of regenerated reactor sets from technique Standby arrangement carries out separation of solid and liquid by dewaterer, and the clear liquid only isolated by dewaterer could return to circulatory pool and enter spray System, does not have the solid formations such as gypsum to return, it is ensured that the non-scaling of absorption system and not block.
[brief description of the drawings]
Fig. 1 is structural representation of the invention.
[specific embodiment]
The invention will be further described below in conjunction with the accompanying drawings, it will be appreciated that specific embodiment described herein is only It is used to explain the present invention, is not intended to limit the present invention.
As shown in figure 1, main in the double de- double alkali method desulfurizing technology device of gas cleaning treatment in the present embodiment include inhaling Receive tower 1, circulatory pool 2, circulating pump 3, technique water tank 4, technique water pump 5, mist eliminator flushing pump 6, alkali tank 7, roots blower 8, regeneration Pond 9, regeneration pump 10, lime storage tank 11, lime stock tank pump 12, lime stock tank 13, dewaterer 14, recycling can 15, slurry recirculating pump 16, stone The composition such as cream storehouse 17, adsorption tower smoke entrance 18 and exhanst gas outlet 19, spraying layer 20 and demister 21.
The pipeline of absorption tower 1 is connected with circulating pump 3, circulate pump pipeline is connected with the spraying layer 20 in tower, flue gas warp After crossing spray washing, after neat stress is through the removal water smoke of demister 21, discharged through exhanst gas outlet 19;Circulatory pool 2 passes through pipeline and follows Ring pump 3 is connected, and circulation pump pipeline and spraying layer is to connecting;Described absorption tower bottom is provided with smoke inlet, technique water tank 4 with The pipeline of technique water pump 5 is connected, technique water tank 4 is also connected with mist eliminator flushing pump 6, alkali tank 7 pipeline and circulatory pool phase Connection, can convey soda to circulatory pool;Roots blower 8 is connected with regenerated reactor with pipeline, to regenerated reactor input air to slurries Aoxidized, regeneration pump 10 is installed in regenerated reactor 9, be connected with dewaterer with pipeline;Lime storage tank 11 is arranged on lime stock tank 13 top, can be to adding lime, lime stock tank pump 12 to be arranged in lime prizes pool in lime stock tank, lime stock tank pump 12 goes out Mouth is with regenerated reactor pipeline to UNICOM;The gypsum discharging opening of dewaterer 14 is connected with recycling can 15, and the gypsum being dehydrated first enters Enter recycling can 15, while the process water that injection is connected with technique water pump pipeline, after mixing washing, pipeline phase is used with it The slurry recirculating pump 16 of connection, dewaterer dehydration is fed again into by overfall, and dewaterer is connected with circulatory pool with pipeline, the clear of abjection Liquid is transported to circulatory pool, through the gypsum of second dehydration, falls into the outward transport treatment of gypsum storehouse 17.
Enter absorption tower from the gas approach for absorbing tower bottom by the former flue gas after dedusting;Desulfurizing agent is main by sodium carbonate Or the soda such as NaOH and process water are compounded into desulfurization alkali lye in circulatory pool;The shower nozzle of device is distinguished by pipeline in absorption tower It is connected with circulating pump, the desulfurization alkali lye in circulatory pool is pumped into absorption tower by circulating pump, spray washing, net cigarette is carried out to former flue gas Gas is discharged into circulatory pool and continues cycling through from the exhanst gas outlet discharge for absorbing tower top, spray liquid;Lime in lime storage tank is in stone Added water in mortar pool and be modulated into lime slurry, be transported to regenerated reactor, with the portion washes liquid that regenerated reactor is further separated into from circulatory pool Reaction generation calcium bisulfite is carried out, while be passed through air to regenerated reactor being aoxidized to calcium bisulfite, calcium carbonate is generated.
Regenerated reactor is connected through gypsum pump through the product of regenerative response with dewaterer, and separation of solid and liquid is carried out with dewaterer, dehydration The clear liquid isolated is returned to circulatory pool and enters slurry spraying system by the connected pipeline of machine.
The gypsum of dewaterer abjection enters recycling can, injection technology water, while be stirred, to alkali lye contained in gypsum Dilatation washing is carried out, the recovered liquid in recycling can is then pumped into dewaterer by coupled recovery again is taken off again Water, abjection delivers to circulatory pool reuse containing alkali lye, the gypsum after second dehydration, into the outward transport of gypsum storehouse.

Claims (10)

1. a kind of double de- Dual-alkali smoke desulfurization devices, including absorption tower, alkali lye recycle unit, alkali liquid regeneration equipment, process water The alkali lye of regeneration is delivered to absorption tower and is sprayed by case, alkali lye recycle unit, and alkali liquid regeneration equipment is received and comes from absorbing tower bottom Material and lime reaction regenerate alkali lye and gypsum deposition,
Characterized by further comprising dehydration equipment, reclaimer, dehydration equipment is received and sunk from the gypsum in alkali liquid regeneration equipment Form sediment, reclaimer receives the dehydrated gypsum from dehydration equipment and the process water from technique water tank carries out dilatation washing, then Generating apparatus receive from the abjection liquid deviate from first in dehydration equipment, and the gypsum feeding that dilatation is washed in the outlet of reclaimer is de- Second dehydration is carried out in wetting system, gypsum storehouse receives the gypsum of the second dehydration from dehydration equipment, and circulatory pool receives to carry out autospasy The abjection liquid of the secondary abjection in wetting system.
2. de- Dual-alkali smoke desulfurization devices as claimed in claim 1 double, it is characterised in that described alkali lye recycle unit bag Include circulatory pool, the abjection liquid that circulatory pool passes through the secondary abjection of conduit acceptor, circulatory pool is by being provided with pipeline and the absorption tower of pump Spray equipment connection absorption tower delivered to the alkali lye for regenerating sprayed, alkali tank is also associated with described circulatory pool.
3. de- Dual-alkali smoke desulfurization devices as claimed in claim 1 double, it is characterised in that alkali liquid regeneration equipment passes through pipeline The outlet opened up with absorption tower bottom is connected to receive the material from absorbing tower bottom.
4. de- Dual-alkali smoke desulfurization devices as claimed in claim 1 double, it is characterised in that described alkali liquid regeneration device bag Include the technique during regenerated reactor, lime stock tank, lime storage tank, lime stock tank receive lime and technique water tank from lime storage tank Water is mixed, and lime stock tank is connected with conveying lime white to regenerated reactor by being provided with the pipeline of pump with regenerated reactor, regeneration Pass through the blower fan outside connection in pond to be passed through air.
5. de- Dual-alkali smoke desulfurization devices as claimed in claim 4 double, it is characterised in that described regenerated reactor is by setting There is the pipeline of pump to be connected with the import of dehydration equipment to convey gypsum deposition, the entrance point of pipeline is arranged on the bottom of regenerated reactor.
6. de- Dual-alkali smoke desulfurization devices as claimed in claim 1 double, it is characterised in that described retracting device is to carry The recycling can of stirring, recycling can is connected by the pipeline with pump with dehydration equipment sends into dehydration equipment with the gypsum for washing dilatation In carry out second dehydration.
7. de- Dual-alkali smoke desulfurization devices as claimed in claim 1 double, it is characterised in that described alkali lye recycle unit is also Receive from the material for absorbing tower bottom.
8. a kind of double de- dual alkali scrubbing FGD process methods, the step of regenerate alkali lye using lime and alkali lye circulation step, Gypsum deposition is produced after lime regeneration alkali lye, it is characterised in that also including the recycling for alkali lye in gypsum deposition, use Any described device of claim 1~6, comprises the following steps:
A. reacted gypsum deposition feeding dehydration equipment is dehydrated first in generating apparatus again,
B. the abjection liquid deviate from is returned in generating apparatus again, and the gypsum feeding retracting device after being dehydrated first is mixed with process water The gypsum liquid of dilatation washing is formed,
C. second dehydration is carried out in gypsum liquid feeding dehydration equipment,
E. the secondary abjection liquid of second dehydration sends into circulatory pool, the gypsum feeding gypsum storehouse of abjection.
9. de- dual alkali scrubbing FGD process methods as claimed in claim 8 double, it is characterised in that described alkali lye circulation step bag Include the sulfur dioxide alkali lye in alkali lye recycle unit delivered to during absorption tower carries out spray removing flue gas.
10. de- dual alkali scrubbing FGD process methods as claimed in claim 8 double, it is characterised in that described utilization lime regenerating alkali It is heavy with lime reaction regeneration alkali lye and gypsum that the step of liquid, receives the material from absorbing tower bottom including alkali liquid regeneration equipment Form sediment.
CN201710083795.0A 2017-02-16 2017-02-16 Double de- Dual-alkali smoke desulfurization devices and method Pending CN106823712A (en)

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Application Number Priority Date Filing Date Title
CN201710083795.0A CN106823712A (en) 2017-02-16 2017-02-16 Double de- Dual-alkali smoke desulfurization devices and method

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Application Number Priority Date Filing Date Title
CN201710083795.0A CN106823712A (en) 2017-02-16 2017-02-16 Double de- Dual-alkali smoke desulfurization devices and method

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Publication Number Publication Date
CN106823712A true CN106823712A (en) 2017-06-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351804A (en) * 1978-11-06 1982-09-28 Research-Cottrell, Inc. Sulfur dioxide scrubber with hydroclone separator
CN2761251Y (en) * 2005-01-14 2006-03-01 浙江大学 Smoke desulfurization device using underflow bialkali method
CN101879406A (en) * 2010-07-15 2010-11-10 煤炭工业济南设计研究院有限公司 Dual-alkali flue gas desulfurization device and desulfurization method
CN102153127A (en) * 2011-03-12 2011-08-17 广东南方碱业股份有限公司 Method for preparing gypsum by removing sulfate radicals from mineral salts with waste distillation liquid from ammonia alkali factory

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4351804A (en) * 1978-11-06 1982-09-28 Research-Cottrell, Inc. Sulfur dioxide scrubber with hydroclone separator
CN2761251Y (en) * 2005-01-14 2006-03-01 浙江大学 Smoke desulfurization device using underflow bialkali method
CN101879406A (en) * 2010-07-15 2010-11-10 煤炭工业济南设计研究院有限公司 Dual-alkali flue gas desulfurization device and desulfurization method
CN102153127A (en) * 2011-03-12 2011-08-17 广东南方碱业股份有限公司 Method for preparing gypsum by removing sulfate radicals from mineral salts with waste distillation liquid from ammonia alkali factory

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