CN110302641A - A kind of desulfurizer and sulfur removal technology of flue gas - Google Patents
A kind of desulfurizer and sulfur removal technology of flue gas Download PDFInfo
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- CN110302641A CN110302641A CN201910338109.9A CN201910338109A CN110302641A CN 110302641 A CN110302641 A CN 110302641A CN 201910338109 A CN201910338109 A CN 201910338109A CN 110302641 A CN110302641 A CN 110302641A
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- desulfurizing tower
- flue gas
- circulatory pool
- desulfurizer
- precipitation tank
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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
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- Treating Waste Gases (AREA)
Abstract
The embodiment of the invention discloses a kind of desulfurizers of flue gas, equipment and desulfurizing tower are added including raw material, raw material addition equipment has been sequentially connected with first stage precipitation tank, second-level settling pond and circulatory pool, and circulatory pool connects desulfurizing tower by transfer pipeline, and transfer pipeline is equipped with Electromagnetic Recirculation Pump；Several mist eliminating zones and spraying zone are successively arranged alternately in desulfurizing tower from top to bottom, mist eliminating zone is equipped with demister, and spraying zone is equipped with layer spray tube, and the outlet of spray tube and transfer pipeline connects, and several spray heads are provided on spray tube；The side wall of desulfurizing tower bottom end is provided with the air inlet of flue gas, and the top surface of desulfurizing tower is provided with exhaust outlet；The bottom end of desulfurizing tower is sequentially connected with circulatory pool and first stage precipitation tank by leakage fluid dram, and sulfur removal technology is comprising steps of S100, desulfurization and demisting；S200, preparation and crystallization；S300, precipitating；S400, it recycles；The present invention in such a way that change prepares lye and in desulfurizing tower the spray mode of doctor solution reduce the blocking probability of pipeline, promote desulfuration efficiency.
Description
Technical field
The present embodiments relate to desulfurizer technical fields, and in particular to a kind of desulfurizer and desulfurization work of flue gas
Skill.
Background technique
Dual alkali is to carry out desulfurization in tower using sodium base desulfurizer, since sodium base desulfurizer alkalinity is strong, sulfur dioxide absorption
Reaction product solubility is big afterwards, not will cause supersaturated crystallization, causes fouling blockage problem.Another aspect desulfurization product is discharged into
Reducing/regenerating is carried out with calcium hydroxide in regenerated reactor, the sodium base desulfurizer regenerated is returned desulfurizing tower recycling again.Double alkali
Method sulfur removal technology reduces investment and operating cost, is relatively specific for medium small boiler and carries out desulfurizing fly ash.
Dual alkali scrubbing FGD process technology is using sodium hydroxide solution as starting desulfurizing agent, and prepared sodium hydroxide is molten
Liquid directly squeezes into SO in desulfurizing tower washing removing flue gas2Achieve the purpose that flue gas desulfurization, then desulfurization product through desulfurizing agent again
Raw pond is reduced into sodium hydroxide and returns recycling in desulfurizing tower again.But during practical sulphur removal reaction, CaSO3With oxygen
Side reaction between gas or moisture usually will appear oversaturated phenomenon, and excessive can cause conveyance conduit when precipitating crystal serious
Blocking, cleaning is time-consuming, while reducing the efficiency of desulphurization reaction, increases desulphurization cost.
Summary of the invention
For this purpose, the embodiment of the present invention provides the desulfurizer and sulfur removal technology of a kind of flue gas, lye is prepared by change
The spray mode of doctor solution is easy blocking to solve pipeline in the prior art in mode and desulfurizing tower, and desulfuration efficiency is low to ask
Topic.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
A kind of desulfurizer of flue gas, including raw material addition equipment and desulfurizing tower, raw material addition equipment have been sequentially connected with one
Grade sedimentation basin, second-level settling pond and circulatory pool, circulatory pool connect desulfurizing tower by transfer pipeline, are provided with electricity on transfer pipeline
Magnetic cycle pump；Several mist eliminating zones and spraying zone are successively arranged alternately in desulfurizing tower from top to bottom, mist eliminating zone is equipped with demister, spray
It drenches area and is equipped with several layers spray tube, the outlet of spray tube and transfer pipeline connects, and is provided with several spray heads on spray tube；It is de-
The side wall at sulphur tower bottom end is provided with the air inlet of flue gas, and the top surface of desulfurizing tower is provided with exhaust outlet；The bottom end of desulfurizing tower passes through row
Liquid mouth is sequentially connected with circulatory pool and first stage precipitation tank.
The embodiment of the present invention is further characterized in that circulatory pool includes the first access and alternate path, and second-level settling pond includes
Upper passage and lower passages, first stage precipitation tank include the logical liquid portion being located above and underlying crystallization unit；First is logical
The liquid outlet of the inlet connection upper passage on road, the entrance on the liquid outlet connecting conveying pipe road of the first access；Alternate path
Inlet connected drainage mouth, the liquid outlet of alternate path connect the inlet in logical liquid portion, and the liquid outlet connection top for leading to liquid portion is logical
The inlet on road leads to liquid portion connection raw material and adds equipment, and crystallization unit is provided with crystal collection port.
The embodiment of the present invention is further characterized in that, control centre is provided on circulatory pool, and circulatory pool, which is internally provided with, to be used for
The pH meter of solution soda acid degree is detected, control centre is electrically connected pH meter and Electromagnetic Recirculation Pump.
The embodiment of the present invention is further characterized in that several spray tubes of same spraying zone are located at differentiated levels, and position
It is arranged in a crossed manner in the spray tube of different level.
The embodiment of the present invention is further characterized in that air inlet pipe is eccentrically set on the side wall of desulfurizing tower, and desulfurizing tower is configured to
Gradually the tower-like hyperbola induced draft structure of the waist of external-open, desulfurization inner wall of tower are provided with cyclone draught screw thread from bottom to middle part.
The embodiment of the present invention is further characterized in that, is provided in the alternate path of circulatory pool for stirring solution in it
The agitating device mixed.
A kind of sulfur removal technology of the desulfurizer of flue gas, includes the following steps:
S100, desulfurization and demisting: flue gas desulfurization and demisting step is repeated in flue gas to be processed in desulfurizing tower, after desulfurization
Gas cleaning after discharge, discharge liquor is transferred to circulatory pool；
S200, preparation and crystallization: preparing doctor solution, is transferred in first stage precipitation tank and stops together with the discharge liquor in circulatory pool
Crystalline catalysts induction crystallization is added into first stage precipitation tank for stagnant crystallization, and crystalline solid is shifted from crystal collection port, remaining slurries turns
Enter second-level settling pond；
S300, precipitating: precipitating filtering is carried out to the slurries in second-level settling pond, the clear liquid on upper layer is transferred in circulatory pool
It recycles；
S400, it recycles: adding lime into circulatory pool or quick lime is stirred, and increase solution alkaline is added
Substance, detect circulatory pool in clear liquid pH value, recycled after up to standard through desulfurizing tower.
The embodiment of the present invention is further characterized in that the crystalline catalysts in step S200 are induction sulfate formation sulfuric acid knot
The substance of eutectic oxide or sulfuric acid crystal salt.
The embodiment of the present invention is further characterized in that, in step 400, the pH value of clear liquid is controlled 5~9 in circulatory pool.
The embodiment of the present invention is further characterized in that, the time that crystallization is stagnated in step 100, in first stage precipitation tank is 6~15
Hour.
The embodiment of the present invention has the advantages that the spray of doctor solution in such a way that change prepares lye and in desulfurizing tower
Leaching mode reduces the blocking probability of pipeline, promotes desulfuration efficiency.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
Structure depicted in this specification, ratio, size etc., only to cooperate the revealed content of specification, for
Those skilled in the art understands and reads, and is not intended to limit the invention enforceable qualifications, therefore does not have technical
Essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing the function of the invention that can be generated
Under effect and the purpose that can reach, should all still it fall in the range of disclosed technology contents obtain and can cover.
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the structural schematic diagram of desulfurizing tower of the invention；
Fig. 3 is the overlooking structure diagram of spray tube in desulfurizing tower of the invention；
Fig. 4 is the flow chart of sulfur removal technology of the invention.
In figure:
1- raw material adds equipment；2- desulfurizing tower；3- first stage precipitation tank；4- second-level settling pond；5- circulatory pool；6- delivery pipe
Road；7- Electromagnetic Recirculation Pump；8- demister；9- spray tube；10- spray head；
11- air inlet pipe；12- exhaust pipe；13- leakage fluid dram；14- crystal collection port；15- control centre；16-pH meter；17- rotation
Flow air inducing screw thread；18- agitating device；
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Embodiment 1:
As shown in Figure 1 to Figure 3, the present invention provides a kind of desulfurizers of flue gas, including former for providing desulfurization lye
The raw material addition equipment 1 and desulfurizing tower 2 of material, raw material addition equipment 1 be sequentially connected with first stage precipitation tank 3, second-level settling pond 4 and
Circulatory pool 5.Circulatory pool 5 connects desulfurizing tower 2 by transfer pipeline 6, is provided on transfer pipeline 6 logical for controlling transfer pipeline 6
Disconnected Electromagnetic Recirculation Pump 7.
Several mist eliminating zones and spraying zone have successively been arranged alternately in desulfurizing tower 2 from top to bottom, sulfur-containing smoke gas can have been carried out
Desulfurization and demisting repeatedly, mist eliminating zone are equipped with demister 8, and spraying zone is equipped with several layers spray tube 9, spray tube 9 and delivery pipe
The outlet on road 6 connects, and several spray heads 10 are provided on spray tube 9.In order to improve the spray efficiency of spray tube 9, same spray
Several spray tubes 9 in leaching area are located at differentiated levels, and the spray tube 9 for being located at different level is arranged in a crossed manner.It improves flat
The uniformity coefficient that face spray tube 9 is distributed is conducive to expand spray area.
The side wall of 2 bottom end of desulfurizing tower is provided with the air inlet 11 of flue gas, and the top surface of desulfurizing tower 2 is provided with exhaust outlet 12.It is de-
The bottom end of sulphur tower 2 is sequentially connected with circulatory pool 5 and first stage precipitation tank 3 by leakage fluid dram 13.Preferably, air inlet pipe 11 is eccentrically set on
The side wall of desulfurizing tower 2, fume desulfurizing tower 2 tangentially enters spraying zone from air inlet 11, and desulfurizing tower 2 is configured to from bottom to middle part
The gradually tower-like hyperbola induced draft structure of the waist of external-open, 2 inner wall of desulfurizing tower are provided with cyclone draught screw thread 17.In 2 knot of desulfurizing tower
It is dynamic that strong eddy flow is formed under the limitation of structure.Doctor solution is flowed out by the spray head 10 inside desulfurizing tower 2, under the disturbance of eddy flow flue gas,
The reverse mass transfer that SO2 and NH3 is carried out with flue gas is conducive to the efficiency for improving mass transfer.
In order to make it easy to understand, each in-house setting of desulfurizer is explained further herein, circulatory pool 5 includes being used for
By treated, circulation fluid is reused for the first access of desulfurization and is used to shift the alternate path of relief liquor after desulfurization.Second level is heavy
Shallow lake pond 4 includes upper passage and the lower passages for saving bit by bit sediment.First stage precipitation tank 3 includes being located above for liquid communication
Logical liquid portion and underlying crystallization unit.The liquid outlet of the inlet connection upper passage of first access, the first access
The entrance on liquid outlet connecting conveying pipe road 6；The liquid outlet connection of the inlet connected drainage mouth 13 of alternate path, alternate path is logical
The inlet in liquid portion leads to the inlet of the liquid outlet connection upper passage in liquid portion, leads to liquid portion connection raw material and adds equipment 1, crystallization
Portion is provided with crystal collection port 14.Due to needing to add the alkaline matters such as quick lime when adjustment solution ph in circulatory pool 5, preferably
It is provided with the agitating device 18 for being stirred to solution in it in the alternate path of circulatory pool 5, improves the effect for adjusting lye
Rate.
As preferred embodiment: the waste liquid after the desulfurization that the bottom end leakage fluid dram 13 of desulfurizing tower 2 flows out is through circulatory pool 5
Alternate path flows into the logical liquid portion of first stage precipitation tank 3, and crystalline catalysts crystallization is added into logical liquid portion, and first stage precipitation tank 3 crystallizes
The crystalline solid that portion is formed is collected in crystal collection port 14.It is put into other liquid and raw material addition equipment 1 in logical liquid portion
Desulfurization material is stirred the upper passage for importing second-level settling pond 4 together, and the precipitating of formation enters lower passages, upper passage
Clear liquid after import circulatory pool 5 the first access in, in the first access additive stir, adjust alkalinity after, by conveying
Pipeline 6 is delivered in desulfurizing tower 2, so far realizes recycling for doctor solution.And the supersaturated solution formed is also in level-one
Dilution is precipitated in sedimentation basin 3, is effectively reduced the probability of line clogging.
In order to make the circulation desulfurization process control of desulfurizer, it is provided with control centre 15 on circulatory pool 5, in circulatory pool 5
Portion is provided with the pH meter 16 for detecting solution soda acid degree, and control centre 15 is electrically connected pH meter 16 and Electromagnetic Recirculation Pump 7.
When pH meter 16 detects that the ph value of liquid in circulatory pool 5 meets doctor solution standard, control centre 15 instructs Electromagnetic Recirculation Pump 7 to beat
It opens, doctor solution is delivered to spray tube 9 through transfer pipeline 6 and carries out desulfurization to sulfur-containing smoke gas.
As shown in figure 4, a kind of sulfur removal technology of the desulfurizer of flue gas, includes the following steps:
S100, desulfurization and demisting: flue gas desulfurization and demisting step, desulfurization is repeated in flue gas to be processed in desulfurizing tower 2
It is discharged after gas cleaning afterwards, discharge liquor is transferred to circulatory pool 5；It is sprayed in sulfur dioxide and spray tube 9 in specific sulfur-containing smoke gas
The doctor solution penetrated is sufficiently mixed, and is desulfurized liquid and is absorbed or adsorb, and water is discharged in the demister 8 of the flue gas after desulfurization and dedusting
Vapour, to prevent the effect of once desulfurization undesirable, the step of alternately multiple desulfurization and demisting.Absorb sulfur dioxide
Solution flows into circulatory pool 5 through the leakage fluid dram 13 of 2 bottom of desulfurizing tower.
S200, preparation and crystallization: preparing doctor solution, and raw material adds the raw material in equipment 1 together with the discharge liquor in circulatory pool 5
It is transferred in first stage precipitation tank 3 together and stagnates crystallization, crystalline catalysts induction crystallization is added into first stage precipitation tank 3, it is preferred that one
The time that crystallization is stagnated in grade sedimentation basin 3 is 6~15 hours.Crystalline solid is shifted from crystal collection port 14, remaining slurries is transferred to two
Grade sedimentation basin 4；Specifically, the raw material in raw material addition equipment 1 is mainly the compound of some sodium or calcium, by it together with discharge liquor
It is transferred to first stage precipitation tank 3 together, due to, containing sulfate such as the more calcium sulfate of desulfurization side reaction formation, being easy in discharge liquor
It forms crystal and blocks pipeline, therefore crystal catalyst induction crystallization is added in first stage precipitation tank 3.Wherein, crystalline catalysts are to lure
Lead the substance of sulfate formation sulfuric acid crystalline oxides or sulfuric acid crystal salt, such as: silica, calcium chloride, calcium sulfite,
One of calcium sulfate or barium sulfate or several mixtures.The crystal of the fraction of formation is shifted from crystal collection port 14,
Remaining slurries is transferred to regeneration after precipitating in second-level settling pond 4.
S300, precipitating: carrying out precipitating filtering to the slurries in second-level settling pond 4, and the clear liquid on upper layer is transferred to circulatory pool 5
In recycle；It is precipitated specifically, most of slurries in first stage precipitation tank 3 are transferred to second-level settling pond 4, and to lower layer
Sediment carry out regular deslagging.
S400, it recycles: adding lime into circulatory pool 5 or quick lime is stirred, and be added and increase solution alkali
Property substance, detect circulatory pool 5 in clear liquid pH value, it is preferred that in circulatory pool 5 clear liquid pH value control 5~9.After up to standard
It is recycled through desulfurizing tower 2.Specifically, the pH value for being transferred to the clear liquid of circulatory pool 5 is lower, quick lime is added or lime stone carries out again
It is raw, pH value is increased, high desulphurizing ability is restored, doctor solution, which enters in desulfurizing tower 2, to be recycled.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of desulfurizer of flue gas, it is characterised in that: add including raw material addition equipment (1) and desulfurizing tower (2), the raw material
Oil (gas) filling device (1) has been sequentially connected with first stage precipitation tank (3), second-level settling pond (4) and circulatory pool (5), and the circulatory pool (5) passes through
Transfer pipeline (6) connects the desulfurizing tower (2), is provided with Electromagnetic Recirculation Pump (7) on the transfer pipeline (6)；The desulfurizing tower
(2) several mist eliminating zones and spraying zone have successively been arranged alternately in from top to bottom, the mist eliminating zone is equipped with demister (8), the spray
It drenches area and is equipped with several layers spray tube (9), the spray tube (9) connect with the outlet of transfer pipeline (6), and the spray tube (9)
On be provided with several spray heads (10)；The side wall of desulfurizing tower (2) bottom end is provided with the air inlet (11) of flue gas, the desulfurization
The top surface of tower (2) is provided with exhaust outlet (12)；The bottom end of the desulfurizing tower (2) is sequentially connected with the circulation by leakage fluid dram (13)
Pond (5) and first stage precipitation tank (3).
2. a kind of desulfurizer of flue gas according to claim 1, it is characterised in that: the circulatory pool (5) includes first
Access and alternate path, the second-level settling pond (4) include upper passage and lower passages, and the first stage precipitation tank (3) includes
The logical liquid portion being located above and underlying crystallization unit；The inlet of first access connects going out for the upper passage
Liquid mouth, the entrance on the liquid outlet connecting conveying pipe road (6) of first access；The inlet of the alternate path connects the row
Liquid mouth (13), the liquid outlet of the alternate path connect the inlet in the logical liquid portion, and the liquid outlet in the logical liquid portion connects institute
The inlet of upper passage is stated, the logical liquid portion connects raw material addition equipment (1), and the crystallization unit is provided with crystal collection
Mouth (14).
3. a kind of desulfurizer of flue gas according to claim 1, it is characterised in that: be provided on the circulatory pool (5)
Control centre (15), the circulatory pool (5) are internally provided with the pH meter (16) for detecting solution soda acid degree, in the control
The heart (15) is electrically connected the pH meter (16) and Electromagnetic Recirculation Pump (7).
4. a kind of desulfurizer of flue gas according to claim 1, it is characterised in that: several sprays of the same spraying zone
Shower pipe (9) is located at differentiated levels, and the spray tube (9) for being located at different level is arranged in a crossed manner.
5. a kind of desulfurizer of flue gas according to claim 1, it is characterised in that: air inlet pipe (11) eccentric setting
Side wall in the desulfurizing tower (2), and the desulfurizing tower (2) is configured to the tower-like hyperbolic of waist of the gradually external-open from bottom to middle part
Line induced draft structure, desulfurizing tower (2) inner wall are provided with cyclone draught screw thread (17).
6. a kind of desulfurizer of flue gas according to claim 2, it is characterised in that: the second of the circulatory pool (5) is logical
The agitating device (18) for being stirred to solution in it is provided in road.
7. a kind of sulfur removal technology of the desulfurizer of flue gas, characterized by the following steps:
S100, desulfurization and demisting: flue gas desulfurization and demisting step is repeated in desulfurizing tower (2) in flue gas to be processed, after desulfurization
Gas cleaning after discharge, discharge liquor is transferred to circulatory pool (5)；
S200, preparation and crystallization: preparing doctor solution, is transferred in first stage precipitation tank (3) together with the discharge liquor in circulatory pool (5)
Crystallization is stagnated, to crystalline catalysts induction crystallization is added in first stage precipitation tank (3), crystalline solid is shifted from crystal collection port (14),
Remaining slurries is transferred to second-level settling pond (4)；
S300, precipitating: carrying out precipitating filtering to the slurries in second-level settling pond (4), and the clear liquid on upper layer is transferred to circulatory pool (5)
In recycle；
S400, recycle: into circulatory pool (5), addition lime or quick lime are stirred, and increase solution alkaline is added
Substance, detection circulatory pool (5) in clear liquid pH value, recycled after up to standard through desulfurizing tower (2).
8. a kind of sulfur removal technology of the desulfurizer of flue gas according to claim 7, it is characterised in that: the step S200
In, crystalline catalysts are the substance for inducing sulfate formation sulfuric acid crystalline oxides or sulfuric acid crystal salt.
9. a kind of sulfur removal technology of the desulfurizer of flue gas according to claim 7, it is characterised in that: the step 400
In, the pH value of clear liquid is controlled 5~9 in circulatory pool (5).
10. a kind of sulfur removal technology of the desulfurizer of flue gas according to claim 7, it is characterised in that: the step 100
In, the time that crystallization is stagnated in the first stage precipitation tank (3) is 6~15 hours.
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Application publication date: 20191008 |