CN108970355A - A kind of wet-dry change coupling smoke processing system and method - Google Patents
A kind of wet-dry change coupling smoke processing system and method Download PDFInfo
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- CN108970355A CN108970355A CN201811038296.0A CN201811038296A CN108970355A CN 108970355 A CN108970355 A CN 108970355A CN 201811038296 A CN201811038296 A CN 201811038296A CN 108970355 A CN108970355 A CN 108970355A
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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
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/73—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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/464—Sulfates of Ca from gases containing sulfur oxides
-
- 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 present invention relates to a kind of wet-dry change coupling smoke processing system and methods.The wet-dry change coupling smoke processing system includes dry type desulfurizing pipeline and wet type desulfurizing pipeline, and depth has coupled two kinds of flue gas desulphurization systems of circulating fluidized bed dry and Gypsum Wet, by the Ca (OH) in dry desulfurization byproduct2Equal calcium based products are recycled as the desulfurizing agent of wet desulfurization system, improve the utilization rate of desulfurizing agent；Calcium sulfite oxidation in dry desulfurization byproduct is generated gypsum for dehydration after calcium sulfate, realizes the comprehensive utilization of dry desulfurization byproduct by the pressure oxidative system and dewatering system for making full use of wet desulphurization simultaneously.In addition, 80-90 DEG C of dry flue gas of dry method desulfuration system discharge and 50 DEG C or so Low Temperature Wet saturated flue gas of wet desulfurization system discharge are sufficiently mixed, and wet flue gas is heated, and is eventually become 65-70 DEG C of dry flue gas and is passed through smoke stack emission, " white cigarette " phenomenon can be eliminated, while reducing the corrosion to chimney.
Description
Technical field
The present invention relates to a kind of wet-dry change coupling smoke processing system and methods.
Background technique
When combustion of fossil fuel, a large amount of SO are contained in flue gas2Equal sour gas, can cause environment seriously to pollute, need
Desulfurization process is carried out to the flue gas for being emitted into atmosphere.The more mainly limestone-gypsum wet flue gas desulfurization technology of application at present
With two kinds of circulating fluidized bed dry flue gas desulfurization technique.
Limestone-gypsum wet flue gas desulfurization technology mature and reliable is the mainstream technology of flue gas desulfurization.The technology uses stone
SO of the lime stone as desulfurizing agent, in flue gas2Slurries absorbing and removing is desulfurized in desulfurizing tower, desulfurization slurry is through peroxidating and dehydration
After processing, the byproduct of formation is gypsum (CaSO4·2H2O).The technology is to SO2Removal efficiency up to 99% or more, byproduct
Gypsum property is stablized, and can be used as resource and is used.It is wet saturated flue gas by the purified flue gas of the technology, temperature is at 50 DEG C
Left and right, " white cigarette " phenomenon can be generated by being discharged into atmosphere.Currently, domestic multiple provinces and cities have put into effect policy, carry out key industry and disappear
" white cigarette " administers special campaigns.
Circulating fluidized bed dry flue gas desulfurization technique dry method is also using more technology.The technology uses calcium hydroxide (Ca
(OH)2) it is used as desulfurizing agent, flue gas enters circulating fluid bed reactor, Ca (OH) from lower part2It sprays into from reactor lower part, sprays simultaneously
Enter the optimal reaction temperature that process water makes flue gas be cooled to 80-90 DEG C.Under flue gas effect, absorbent and cycle stock accelerate to suspend
Fluidized state is formed, flue gas and desulfurizing agent are sufficiently mixed in tower, SO2It is absorbed, generation main component is CaSO3·1/2H2O
Desulphurization, desulfuration efficiency reaches as high as 99% or more.Desulphurization and unreacted Ca (OH)2By the dry dust removal after reactor
Device trapping, a part are used as cycle stock, send circulating bed reactor lower part back to by air conveyer flume and participate in reacting again.It is another
It send to flying dust storage field stockpiling or outward transport processing part.Purified flue gas is about 80-90 DEG C, is discharged by chimney.
The more fume treatment technology of application is mainly limestone-gypsum wet flue gas desulfurization technology and recirculating fluidized bed at present
Two kinds of dry flue gas desulphurization technology, two kinds of technologies are all single use, and are had the following problems:
1) in circulating fluidized bed dry desulfurization technology, flue gas and desulfurizing agent are gas-solid contact, mass-transfer efficiency in desulfurizing tower
It is low.To realize higher desulfuration efficiency, need to increase desulfurizing agent usage amount, calcium sulfur ratio is often controlled in 1.4-1.8 or so, desulfurization
The utilization rate of agent is only 55%-71%, a large amount of Ca (OH)2Reaction is had neither part nor lot in just to be discharged.In addition, circulating fluidized bed dry desulfurization
Technology cannot achieve CaSO3Pressure oxidation.Therefore, the main ingredient of desulfuration byproduct is CaSO3·1/2H2O and Ca
(OH)2, it is difficult to it comprehensively utilizes, mostly uses and abandon processing.But the CaSO in desulfuration byproduct3·1/2H2O is highly unstable, can divide
Solve SO2Cause the secondary pollution of environment.A large amount of Ca (OH) in byproduct2Equal calcium based products originally can be used as desulfurizing agent use,
The wasting of resources is caused after abandoning processing.
2) the purified flue gas of Limestone-gypsum Wet Flue Gas Desulfurization Process technology is 50 DEG C or so of wet saturated flue gas, water capacity compared with
High (13-15%).Temperature reduces rapidly after wet flue gas is discharged into atmosphere, and the vapor in flue gas is in hypersaturated state and condenses knot
Mist generates " white cigarette " phenomenon, forms visual pollution." white cigarette " main use after eliminating wet desulphurization at present directly heats or cold
Neat stress after desulfurization is first cooled down condensation, discharges after reheating, need to increase investment, set simultaneously by the method reheated after solidifying
Standby use environment is severe, and operation and maintenance difficulty is big.
Summary of the invention
In view of the above-mentioned problems, the present invention makes full use of Limestone-gypsum Wet Flue Gas Desulfurization Process technology and circulating fluidized bed dry de-
The advantages of sulphur technology, the shortcomings that coupling by the depth of two kinds of technologies, overcome original technology, provides a kind of wet-dry change coupling flue gas
Processing system and method.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of wet-dry change coupling smoke processing system, including dry type desulfurizing pipeline and wet type desulfurizing pipeline；
Recirculating fluidized bed dry-type desulfurizing tower, dry collector and smoke discharge pipe are successively arranged on the dry type desulfurizing pipeline
A；Wherein, the bottom of the recirculating fluidized bed dry-type desulfurizing tower is respectively equipped with gas inlet and technique water inlet, the recycle stream
The top for changing bed dry-type desulfurizing tower is equipped with exhanst gas outlet, and the exhanst gas outlet connects smoke discharge pipe by the dry collector
A, the bottom of the dry collector are connected to the bottom of the recirculating fluidized bed dry-type desulfurizing tower by air conveyer flume；
Wet desulphurization tower is provided on the wet type desulfurizing pipeline, the top of the wet desulphurization tower is equipped with exhanst gas outlet simultaneously
Connect smoke discharge pipe B；
The dry collector bottom is connected to limestone slurry flow container through desulfurization ash cellar, and the limestone slurry flow container is through lime
Stone slurries pump the slurry pool for being connected to wet desulphurization tower；The smoke discharge pipe A and smoke discharge pipe B converge for flue gas emission it is total
Pipeline simultaneously connects chimney.
Further, be respectively equipped at the top of the limestone slurry flow container agstone entrance, dry-process desulfurized ash entrance and
Technique water inlet is additionally provided with blender in the limestone slurry flow container.
Further, the wet desulphurization tower is externally provided with gypsum discharge pump, sets through the gypsum discharge pump and gypsum dehydration
Gypsum in standby discharge slurry pool.
Further, the wet desulphurization tower is externally provided with oxidation fan, and the oxidation fan is connected to wet desulphurization tower
Slurry pool.
Further, it connects and is equipped with work in the technique water lines of recirculating fluidized bed dry-type desulfurizing tower and limestone slurry flow container
Skill water pump.
Further, the wet desulphurization tower is externally provided with slurry circulating pump, and the slurry circulating pump is used for the slurries
Slurries in pond are delivered to the spraying layer in wet desulphurization tower.
A kind of wet-dry change coupling flue gas processing method, comprising the following steps:
Step 1, the flue gas after dedusting is divided into two-way after booster fan, and former flue gas A enters recirculating fluidized bed dry type desulfurizing
Tower, former flue gas B enter wet desulphurization tower, wherein the flue-gas temperature after the dedusting is greater than 90 DEG C；
Step 2, in recirculating fluidized bed dry-type desulfurizing tower, the process water that former flue gas A is injected into is cooled to 80 DEG C -90 DEG C
Afterwards, the SO in former flue gas A2With the calcium hydroxide (Ca (OH) of addition2) reacting generates CaSO3·1/2H2O；Recirculating fluidized bed is dry
The high-concentration desulfurized ash of formula desulfurizing tower exhanst gas outlet entrainment is trapped by dry collector, is followed mostly as cycle stock return
Desulphurization reaction is participated in ring fluidized bed dry-type desulfurizing tower again, another part is sent into wet desulphurization tower as dry type desulfurizing byproduct
Slurry pool in, wherein the main component of the high-concentration desulfurized ash be Ca (OH)2And CaSO3·1/2H2O；
Step 3, in wet desulphurization tower, former flue gas B is desulfurized slurries and is cooled to saturation temperature rapidly, in former flue gas B
SO2With the lime stone (CaCO of addition3) and dry type desulfurizing byproduct in (Ca (OH)2) mixed serum reacts generation
CaSO3, CaSO3With the CaSO in dry type desulfurizing byproduct3·1/2H2O enters in slurry pool；It is empty that oxidation is blasted into slurry pool
Gas, so that CaSO3It is further oxidized to CaSO4；Gypsum (CaSO in slurry pool4·2H2O) slurries are delivered to gypsum dehydration and set
It is standby to be carried out dehydrating, ultimately generate gypsum；
Step 4, former flue gas A becomes dry state neat stress after desulfurization and dust removal process, and former flue gas B becomes after desulfurization process
Hygrometric state neat stress；Dry state neat stress and hygrometric state neat stress are sufficiently mixed into dry flue gas in flue gas emission main pipe rail and pass through chimney
Discharge.
Further, the temperature of dry state neat stress is 80-90 DEG C in step 4, and the temperature of hygrometric state neat stress is 50 DEG C or so,
The temperature of dry flue gas is 65-70 DEG C.
Beneficial effects of the present invention are as follows:
Depth of the present invention has coupled two kinds of flue gas desulphurization systems of circulating fluidized bed dry and Gypsum Wet.One side
Face send circulating fluidized bed dry desulfuration byproduct into Limestone-gypsum Wet Flue Gas Desulfurization Process system, big in dry desulfurization byproduct
Measure unused Ca (OH)2Desulfurizing agent secondary use of the equal calcium-based desulfurizing agents as wet desulfurization system, and make full use of wet process
The existing oxidation unit of desulphurization system and gypsum dewatering equipment, by the CaSO in dry desulfurization byproduct3·1/2H2O is aoxidized
With gypsum is generated after dehydration, not only solve the problems, such as dry desulfurization byproduct secondary pollution, while also greatly improved de-
The utilization rate of sulphur byproduct improves the comprehensive utilization ratio of desulfuration byproduct to 99% or more, by the comprehensive utilization ratio of desulfurizing agent
It improves to 95% or more, desulfurizing agent consumption is greatly reduced.On the other hand, the higher dry cigarette of temperature dry method desulfuration system being discharged
The Low Temperature Wet saturated flue gas mixing of gas and wet desulfurization system discharge, flue-gas temperature is improved to more than dew-point temperature, can be eliminated
Or " white cigarette " phenomenon is substantially reduced, while reducing chimney corrosion risk.
Detailed description of the invention
Fig. 1 is that wet-dry change of the present invention couples smoke processing system structural schematic diagram；
Wherein, 1- recirculating fluidized bed dry-type desulfurizing tower, 2- air conveyer flume, 3- dry collector, 4- desulfurization ash cellar, 5-
Chimney, 6- gypsum dehydration equipment, 7- slurry circulating pump, 8- gypsum discharge pump, 9- wet desulphurization tower, 10- oxidation fan, 11- stone
Lime stone slurries pump, 12- limestone slurry flow container, 13- technique water pump, 14- booster fan, 15- technique water lines.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of wet-dry change coupling smoke processing system, as shown in Figure 1, including dry type desulfurizing pipeline and wet type desulfurizing pipeline；
Recirculating fluidized bed dry-type desulfurizing tower 1, dry collector 3 and flue gas emission are successively arranged on the dry type desulfurizing pipeline
Pipe A；Wherein, the bottom of the recirculating fluidized bed dry-type desulfurizing tower 1 is respectively equipped with gas inlet and technique water inlet, the circulation
The top of fluidized bed dry type desulfurizing tower 1 is equipped with exhanst gas outlet, and the exhanst gas outlet connects flue gas row by the dry collector 3
Pipe A is put, the bottom of the dry collector 3 is connected to the recirculating fluidized bed dry-type desulfurizing tower 1 by air conveyer flume 2
Bottom；
Wet desulphurization tower 9 is provided on the wet type desulfurizing pipeline, the top of the wet desulphurization tower 9 is equipped with exhanst gas outlet
And connect smoke discharge pipe B；
3 bottom of dry collector is connected to limestone slurry flow container 12, the limestone slurry flow container 12 through desulfurization ash cellar 4
The slurry pool of wet desulphurization tower 9 is connected to through limestone slurry liquid pump 11, wherein the top of the limestone slurry flow container 12 is set respectively
There are agstone entrance, dry-process desulfurized ash entrance and technique water inlet, is additionally provided with blender in the limestone slurry flow container 12.Institute
Smoke discharge pipe A and smoke discharge pipe B is stated to converge for flue gas emission main pipe rail and connect chimney 5.
The wet desulphurization tower 9 is externally provided with gypsum discharge pump 8, is discharged through the gypsum discharge pump 8 and gypsum dehydration equipment 6
Gypsum in slurry pool.
Preferably, the wet desulphurization tower 9 is externally provided with oxidation fan 10, and the oxidation fan 10 is connected to wet desulphurization tower
9 slurry pool.
Technique water pump is equipped in the technique water lines of connection recirculating fluidized bed dry-type desulfurizing tower 1 and limestone slurry flow container 12
13。
The wet desulphurization tower 9 is externally provided with slurry circulating pump 7, and the slurry circulating pump 7 is used for will be in the slurry pool
Slurries are delivered to the spraying layer in wet desulphurization tower 9.
A kind of wet-dry change coupling flue gas processing method, comprising the following steps:
Step 1, the flue gas after dedusting is divided into two-way after booster fan, and former flue gas A enters recirculating fluidized bed dry type desulfurizing
Tower, former flue gas B enter wet desulphurization tower, wherein the flue-gas temperature after the dedusting is greater than 90 DEG C；
Step 2, in recirculating fluidized bed dry-type desulfurizing tower, the process water that former flue gas A is injected into is cooled to 80 DEG C -90 DEG C
Afterwards, the SO in former flue gas A2With the calcium hydroxide (Ca (OH) of addition2) following reaction: Ca (OH) mainly occurs2+SO2=CaSO3·1/
2H2O+1/2H2O；The high-concentration desulfurized ash of recirculating fluidized bed dry-type desulfurizing tower exhanst gas outlet entrainment is trapped down by dry collector
Come, is returned mostly as cycle stock and participate in desulphurization reaction in recirculating fluidized bed dry-type desulfurizing tower again, another part is as dry
Formula desulfuration byproduct is sent into the slurry pool of wet desulphurization tower, wherein the main component of the high-concentration desulfurized ash is Ca (OH)2
And CaSO3·1/2H2O；
Step 3, in wet desulphurization tower, former flue gas B is desulfurized slurries and is cooled to rapidly saturation temperature (50 DEG C or so), former
SO in flue gas B2With the lime stone (CaCO of addition3) and dry type desulfurizing byproduct in (Ca (OH)2) mixed serum occur with
Lower reaction:
SO2+H2O=H2SO3
CaCO3+H2SO3=CaSO3+CO2+H2O
Ca(OH)2+H2SO3=CaSO3+2H2O
React the CaSO generated3With the CaSO in dry type desulfurizing byproduct3·1/2H2O enters the slurry of wet type desulfurizing tower bottom
In liquid pool；Oxidation air is blasted into slurry pool, so that CaSO3It is further oxidized to CaSO4, and crystallize into gypsum crystal:
CaSO3+1/2O2+2H2O=CaSO4·2H2O
Gypsum (CaSO in slurry pool4·2H2O) slurries are delivered to gypsum dehydration equipment and are carried out dehydrating, and ultimately generate
Gypsum；
Step 4, former flue gas A becomes dry state neat stress after desulfurization and dust removal process, and temperature is 80-90 DEG C；Former flue gas B warp
Become hygrometric state neat stress after desulfurization process, temperature is 50 DEG C or so；Dry state neat stress and hygrometric state neat stress are in flue gas emission general pipeline
It is sufficiently mixed into 65-70 DEG C of dry flue gas in road and passes through smoke stack emission.The flue-gas temperature of discharge is higher than dew point, existing without " white cigarette "
As, while reducing the corrosion to chimney.
The byproduct of dry method desulfuration system is added in wet desulfurization system by the present invention.Ca in dry desulfurization byproduct
(OH)2Equal calcium based products are recycled as the desulfurizing agent of wet desulfurization system, improve the utilization rate of desulfurizing agent.Sufficiently benefit
With the pressure oxidative system and dewatering system of wet desulphurization, after being calcium sulfate for the calcium sulfite oxidation in dry desulfurization byproduct
Dehydration generates gypsum, realizes the comprehensive utilization of dry desulfurization byproduct.
In addition, 80-90 DEG C of dry flue gas of dry method desulfuration system discharge and 50 DEG C or so low temperature of wet desulfurization system discharge
Wet saturated flue gas is sufficiently mixed, and wet flue gas is heated, and is eventually become 65-70 DEG C of dry flue gas and is passed through smoke stack emission, can eliminate
" white cigarette " phenomenon, while reducing the corrosion to chimney.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of wet-dry change couples smoke processing system, which is characterized in that including dry type desulfurizing pipeline and wet type desulfurizing pipeline；
Recirculating fluidized bed dry-type desulfurizing tower (1), dry collector (3) and flue gas emission are successively arranged on the dry type desulfurizing pipeline
Pipe A；Wherein, the bottom of the recirculating fluidized bed dry-type desulfurizing tower (1) is respectively equipped with gas inlet and technique water inlet, described to follow
The top of ring fluidized bed dry-type desulfurizing tower (1) is equipped with exhanst gas outlet, and the exhanst gas outlet is connected by the dry collector (3)
Smoke discharge pipe A, the bottom of the dry collector (3) are connected to the recirculating fluidized bed by air conveyer flume (2) and do
The bottom of formula desulfurizing tower (1)；
It is provided on the wet type desulfurizing pipeline wet desulphurization tower (9), the top of the wet desulphurization tower (9) is equipped with exhanst gas outlet
And connect smoke discharge pipe B；
Dry collector (3) bottom is connected to limestone slurry flow container (12) through desulfurization ash cellar (4), the limestone slurry flow container
(12) slurry pool of wet desulphurization tower (9) is connected to through limestone slurry liquid pump (11)；The smoke discharge pipe A and smoke discharge pipe
B converges for flue gas emission main pipe rail and connects chimney (5).
2. wet-dry change according to claim 1 couples smoke processing system, which is characterized in that the limestone slurry flow container
(12) agstone entrance, dry-process desulfurized ash entrance and technique water inlet, the limestone slurry flow container are respectively equipped at the top of
(12) blender is additionally provided in.
3. wet-dry change according to claim 1 couples smoke processing system, which is characterized in that the wet desulphurization tower (9)
Gypsum discharge pump (8) are externally provided with, through the gypsum in the gypsum discharge pump (8) and gypsum dehydration equipment (6) discharge slurry pool.
4. wet-dry change according to claim 1 couples smoke processing system, which is characterized in that the wet desulphurization tower (9)
It is externally provided with oxidation fan (10), the oxidation fan (10) is connected to the slurry pool of wet desulphurization tower (9).
5. wet-dry change according to claim 1 couples smoke processing system, which is characterized in that connection recirculating fluidized bed dry type
Technique water pump (13) is equipped in the technique water lines of desulfurizing tower (1) and limestone slurry flow container (12).
6. wet-dry change according to claim 1 couples smoke processing system, which is characterized in that the wet desulphurization tower (9)
It is externally provided with slurry circulating pump (7), the slurry circulating pump (7) is used to the slurries in the slurry pool being delivered to wet desulphurization tower
(9) spraying layer in.
7. a kind of wet-dry change couples flue gas processing method, which comprises the following steps:
Step 1, the flue gas after dedusting is divided into two-way after booster fan, and former flue gas A enters recirculating fluidized bed dry-type desulfurizing tower, former
Flue gas B enters wet desulphurization tower, wherein the flue-gas temperature after the dedusting is greater than 90 DEG C；
Step 2, former after the process water that former flue gas A is injected into is cooled to 80 DEG C -90 DEG C in recirculating fluidized bed dry-type desulfurizing tower
SO in flue gas A2With the calcium hydroxide (Ca (OH) of addition2) reacting generates CaSO3·1/2H2O；Recirculating fluidized bed dry type is de-
The high-concentration desulfurized ash of sulphur tower flue gas outlet clip band is trapped by dry collector, returns to recycle stream mostly as cycle stock
Change and participate in desulphurization reaction in bed dry-type desulfurizing tower again, another part is sent into the slurry of wet desulphurization tower as dry type desulfurizing byproduct
In liquid pool, wherein the main component of the high-concentration desulfurized ash is Ca (OH)2And CaSO3·1/2H2O；
Step 3, in wet desulphurization tower, former flue gas B is desulfurized slurries and is cooled to saturation temperature, the SO in former flue gas B rapidly2With
Lime stone (the CaCO of addition3) and dry type desulfurizing byproduct in (Ca (OH)2) mixed serum reacts and generate CaSO3,
CaSO3With the CaSO in dry type desulfurizing byproduct3·1/2H2O enters in slurry pool；Oxidation air is blasted into slurry pool, so that
CaSO3It is further oxidized to CaSO4；Gypsum (CaSO in slurry pool4·2H2O) slurries are delivered to gypsum dehydration equipment and are taken off
Water process ultimately generates gypsum；
Step 4, former flue gas A becomes dry state neat stress after desulfurization and dust removal process, and former flue gas B becomes hygrometric state after desulfurization process
Neat stress；Dry state neat stress and hygrometric state neat stress are sufficiently mixed into dry flue gas in flue gas emission main pipe rail and are arranged by chimney
It puts.
8. wet-dry change according to claim 7 couples flue gas processing method, which is characterized in that dry state neat stress in step 4
Temperature be 80-90 DEG C, the temperature of hygrometric state neat stress is 50 DEG C or so, and the temperature of dry flue gas is 65-70 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811038296.0A CN108970355A (en) | 2018-09-06 | 2018-09-06 | A kind of wet-dry change coupling smoke processing system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811038296.0A CN108970355A (en) | 2018-09-06 | 2018-09-06 | A kind of wet-dry change coupling smoke processing system and method |
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| Publication Number | Publication Date |
|---|---|
| CN108970355A true CN108970355A (en) | 2018-12-11 |
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Cited By (3)
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| CN110237693A (en) * | 2019-06-14 | 2019-09-17 | 合肥中亚环保科技有限公司 | A kind of cement plant kiln exit gas cooling, desulfurizing synergistic device |
| CN112415148A (en) * | 2020-08-18 | 2021-02-26 | 北京国电龙源环保工程有限公司 | Wet flue gas desulfurization system CaSO based on online learning3Soft measurement method |
| CN114618278A (en) * | 2022-04-06 | 2022-06-14 | 承德建龙特殊钢有限公司 | Device system and method for cooperatively utilizing lime-based desulfurized fly ash by lime-gypsum method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110237693A (en) * | 2019-06-14 | 2019-09-17 | 合肥中亚环保科技有限公司 | A kind of cement plant kiln exit gas cooling, desulfurizing synergistic device |
| CN112415148A (en) * | 2020-08-18 | 2021-02-26 | 北京国电龙源环保工程有限公司 | Wet flue gas desulfurization system CaSO based on online learning3Soft measurement method |
| CN114618278A (en) * | 2022-04-06 | 2022-06-14 | 承德建龙特殊钢有限公司 | Device system and method for cooperatively utilizing lime-based desulfurized fly ash by lime-gypsum method |
| CN114618278B (en) * | 2022-04-06 | 2023-08-15 | 承德建龙特殊钢有限公司 | Device system and method for cooperatively utilizing lime-based desulfurized ash by lime-gypsum method |
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Application publication date: 20181211 |