CN110433636A - A kind of chlorosulfonic acid production exhaust treatment system and processing method - Google Patents
A kind of chlorosulfonic acid production exhaust treatment system and processing method Download PDFInfo
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- CN110433636A CN110433636A CN201910662060.2A CN201910662060A CN110433636A CN 110433636 A CN110433636 A CN 110433636A CN 201910662060 A CN201910662060 A CN 201910662060A CN 110433636 A CN110433636 A CN 110433636A
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- acid absorption
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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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/20—Halogens or halogen compounds
- B01D2257/204—Inorganic halogen compounds
- B01D2257/2045—Hydrochloric acid
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a kind of chlorosulfonic acid production exhaust treatment system and processing methods, the central gas import of sulfuric acid absorption tower is connect with tail gas source, the concentrated sulfuric acid is contained in its bottom tower reactor, top is provided with spray structure, and bottom tower reactor is connect by the first pump with spray structure；The central gas import of the hydrochloric acid absorption tower and the top gas of sulfuric acid absorption tower are exported and are connected, and water is contained in the bottom tower reactor of hydrochloric acid absorption tower, and top is provided with spray structure, and bottom tower reactor is connect by the second pump with spray structure；The top exit of the central gas import hydrochloric acid absorption tower of the alkali adsorption tower connects, and lye is contained in the bottom tower reactor of alkali adsorption tower, and top is provided with spray structure, and bottom tower reactor is pumped by third and connect with spray structure；The inlet exhaust gas and offgas outlet of tail gas buffer are all set in the top of tail gas buffer, the top exit connection of inlet exhaust gas and alkali adsorption tower, and offgas outlet is connect by the 4th pump with chimney.
Description
Technical field
The invention belongs to chlorosulfonic acids to produce tail gas disposal technique field, and in particular to a kind of chlorosulfonic acid production vent gas treatment system
System and processing method.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty
It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art
Art.
The production technology of chlorosulfonic acid is generally the chlorine to come from the conveying of chlor-alkali system and hydrogen in hydrogen chloride synthetic furnace
Burning generates HCl, and HCl gas conveys the SO to come with sulfuric acid plant through dry water removal3Gas and by it is auxiliary suction tower return gas lead to
It crosses mixer mixing and is directly entered synthetic tower, control reaction temperature at 80-150 DEG C, high―temperature nuclei chlorosulfonic acid, on-condensible gas is sent to
Exhaust treatment system processing.Contain a small amount of SO in on-condensible gas2、SO3, HCl and a large amount of air.At existing on-condensible gas
Reason method is usually that tail gas is passed through pickling tower, and the SO in 98% sulfuric acid cyclic absorption mixed gas is utilized in pickling tower3Gas
Body when sulfuric acid reaches certain liquid level in tower, then squeezes into sulfuric acid storage tank, the unabsorbed gases (hydrogen chloride gas in pickling tower
Body) tail gas absorber is finally entered, it is absorbed in tail gas absorber using water circulated sprinkling.Pacify in tail gas absorber gas vent
An exhaust fan is filled, residual gas is pumped into chimney emptying by blower.Inventors have found that this kind of exhaust gas treating method can not
Effectively remove the SO in tail gas2Gas has that environmental protection is not up to standard in the tail gas of discharge, is easy to cause shadow to ambient enviroment
It rings.Moreover, carrying a large amount of water droplet in emptying end gas after recycling water spray, and still contain sour gas in emptying end gas
Body, when through smoke stack emission, acid solution easy to form generates corrosion to the inner wall of chimney, influences the service life of chimney.
Summary of the invention
For above-mentioned the technical problems existing in the prior art, the object of the present invention is to provide a kind of chlorosulfonic acids to produce tail gas
Processing system and processing method.The various sour gas in tail gas can be effectively removed, and the tail gas after spraying can be removed
The a large amount of water droplet of middle carrying mitigates the corrosion to chimney.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
A kind of chlorosulfonic acid production exhaust treatment system, including sulfuric acid absorption tower, hydrochloric acid absorption tower, alkali adsorption tower, tail gas are slow
Rush tank and chimney, wherein
The central gas import of the sulfuric acid absorption tower is connect with tail gas source, and the concentrated sulfuric acid, top are contained in the tower reactor of bottom
Portion is provided with spray structure, and bottom tower reactor is connect by the first pump with spray structure；
The central gas import of the hydrochloric acid absorption tower and the top gas of sulfuric acid absorption tower are exported and are connected, hydrochloric acid absorption tower
Bottom tower reactor in contain water, top is provided with spray structure, and bottom tower reactor is connect by the second pump with spray structure；
The top exit of the central gas import hydrochloric acid absorption tower of the alkali adsorption tower connects, the bottom tower reactor of alkali adsorption tower
Interior splendid attire lye, top are provided with spray structure, and bottom tower reactor is pumped by third and connect with spray structure；
The inlet exhaust gas and offgas outlet of tail gas buffer are all set in the top of tail gas buffer, and inlet exhaust gas and alkali are inhaled
The top exit connection of tower is received, offgas outlet is connect by the 4th pump with chimney.
In sulfuric acid absorption tower, circulated sprinkling is carried out to tail gas using the concentrated sulfuric acid, to fully absorb three oxidations in tail gas
Sulphur；In hydrochloric acid absorption tower, circulated sprinkling is carried out to tail gas using water, to fully absorb the HCl gas in tail gas；In Alkali absorption
In tower, circulated sprinkling is carried out to tail gas using lye, to fully absorb the sour gas such as the sulfur dioxide in tail gas.
It is sprayed even across lye, still inevitably acidic materials such as residual sulfur dioxide in tail gas, and passes through water and spray
A large amount of water droplet is carried in tail gas after leaching and lye spray, in order to avoid acid solution is precipitated in inner wall of stack, corruption is caused to chimney
Erosion increases tail gas buffer between chimney and alkali adsorption tower, and tail gas flow velocity moment in tail gas buffer reduces, and flows to
It changes, the water droplet of carrying can separate under its gravity and effect of inertia with gas, and collect in tail gas buffer, to subtract
Moisture content in few tail gas.
Simultaneously as the discharge amount of tail gas is unstable in chlorosulfonic acid life process, when being delivered to smoke stack emission through pump, it is easy
It causes the load of pump constantly to change, influences the stable operation of pump, and have an adverse effect to the service life of pump.When in chimney
Tail gas buffer is set between alkali adsorption tower, buffering homogenizing can be carried out to exhaust flow, to guarantee that the load of pump tends to be equal
It is even, to improve pump service life advantageously.
In some embodiments, the quantity of hydrochloric acid absorption tower is 1-3, is connected between different hydrochloric acid absorption towers.
Multiple hydrochloric acid absorption towers are connected, to guarantee to fully absorb the HCl gas in tail gas.
In some embodiments, the quantity of alkali adsorption tower is 1-3, is connected between different alkali adsorption towers.
Multiple alkali adsorption towers are connected, to improve the removal rate of sulfur dioxide in tail gas as far as possible.
In some embodiments, the tail gas buffer is horizontal type structure, is classified as upper layer and lower layer by separation structure, point
Every being provided with bakie structure in structure, the bottom opening of bakie structure, and be from top to bottom undergauge structure；
Tail gas buffer further includes at least one baffle, and the top of tail gas buffer, the bottom of baffle are fixed at the top of baffle
Portion extends to the bottom of bakie structure, and reserves set distance with the bottom of bakie structure.
Through the tail gas of spray removing sour gas after inlet exhaust gas enters tail gas buffer, since circulation diameter is prominent
Become, so that the flow velocity of tail gas significantly reduces, the water droplet carried in tail gas realizes part water under the action of inertia and self gravity
The separation of drop and tail gas, the water droplet of decline is pooled on separation structure, and the bottom opening through bakie structure flow to separation structure
Lower section.Separation structure separates tail gas and the water of collection, to prevent the evaporation again of water.
Space between the bottom and baffle of tail gas natural leak slot structure by preliminary gas-liquid separation is flowed through, due to the space
Cross-sectional area be reduced significantly, cause the flow velocity of tail gas to significantly improve, further, since bakie structure be concave inward structure, tail gas stream
Through herein when, the change dramatically of flow direction and flow velocity occurs, and the inertia of water droplet is noticeably greater than the inertia of gas, so, water droplet with
The flow direction change of gas is inconsistent, and water droplet is easier on the side wall for colliding bakie structure, is realized the separation again of gas-liquid, is received
The side wall of the water droplet natural leak slot structure of collection flows into the lower section of diaphragm structure by the outlet at bottom of bakie structure to flowing down.
Further, the quantity of bakie structure is 1-10, is further 2-6, is further 3-6, baffle
Quantity it is equal with the quantity of bakie structure.
Further, the angle between the side wall and baffle of bakie structure is 20 ° -45 °.
Since the large-sized water droplet after gas initial gross separation, carried in gas has largely been removed, pass through
The partial size for the water droplet that bakie structure is separated is smaller, and quality is smaller, smaller with the inertia difference of gas.So changing in flow direction
When change, the change of the flow direction of drop and the flow direction change difference of gas are smaller.If the side wall of bakie structure and baffle it
Between angle it is smaller when, be more advantageous to capture drop, when angle is excessive, most of drop is difficult to be captured, and influences going for drop
Except efficiency.
Further, the bakie structure vertical is in the axial direction of tail gas buffer, and the section for covering tail gas buffer is straight
Diameter.
A kind of chlorosulfonic acid production exhaust gas treating method, includes the following steps:
Production tail gas from chlorosulfonic acid synthesis procedure enters in sulfuric acid absorption tower, under the circulated sprinkling of the concentrated sulfuric acid, removes
Remove the sulfur trioxide in production tail gas；
The production tail gas of sulfuric acid absorption tower outflow enters in hydrochloric acid absorption tower, under the circulated sprinkling of water, removes production tail
HCl in gas；
The production tail gas of hydrochloric acid absorption tower outflow enters alkali adsorption tower, under the circulated sprinkling of lye, removes production tail gas
In sulfur dioxide；
The production tail gas flowed out in hydrochloric acid absorption tower is buffered through tail gas buffer, after gas-liquid separation, is pumped to chimney row
It puts.
In some embodiments, the concentration of the concentrated sulfuric acid is 98-98.7%, mass percent.
In some embodiments, the concentration of the lye is 8-15%, mass percent.
The invention has the benefit that
The SO contained in tail gas2、SO3、HCl、Cl2Ingredient is disposed off, and by-product hydrochloric acid, sodium hypochlorite, sodium sulfite.
Tail gas can reach national requirements discharge index after spray-absorption is handled, and environment protecting is significant.
Due to being provided with tail gas buffer, the water droplet carried in tail gas can be significantly removed, the corruption to inner wall of stack is mitigated
Erosion.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is that the chlorosulfonic acid of the embodiment of the present invention produces the process flow chart of tail gas environment-friendly disposal system；
Fig. 2 is the schematic diagram of internal structure of the tail gas buffer of the embodiment of the present invention.
Wherein, 1, sulfuric acid absorption tower, the 2, first hydrochloric acid absorption tower, the 3, second hydrochloric acid absorption tower, the 4, first alkali adsorption tower, 5,
Second alkali adsorption tower, 6, tail gas buffer, 7, exhaust fan, 8, chimney, 9, inlet exhaust gas, 10, baffle, 11, offgas outlet,
12, deflector, 13, funnel structure.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Embodiment:
As shown in Figure 1, a kind of chlorosulfonic acid production tail gas environment-friendly treating process and its device, mainly include sulfuric acid absorption system
System, absorption by Hydrochloric Acid system, Alkali absorption system, tail gas buffer system.Sulfuric acid absorption system includes tail gas into and out of tower tube line, sulfuric acid
Absorption tower 1, sulfuric acid absorption tower circulating pump composition.Sulfuric acid absorption system inlet exhaust gas pipeline is connected with synthetic tower outlet line,
Chlorosulfonic acid tail gas enters sulfuric acid absorption tower 1 along vapor delivery line, is washed in sulfuric acid absorption tower 1 using the 98-98.7% concentrated sulfuric acid
Wash, by the concentrated sulfuric acid in sulphuric acid absorbing column filler layer counter current contacting, SO in chlorosulfonic acid tail gas3It is predominantly absorbed.
Absorption by Hydrochloric Acid system is by the first hydrochloric acid absorption tower 2, the second hydrochloric acid absorption tower 3, the first hydrochloric acid absorption tower circulating pump,
Two hydrochloric acid absorption tower circulating pumps, filler pipe road, tail gas import and export pipeline composition, equipment and pipeline are glass steel material, connection position
It sets to paste using fiber glass resin, felt and complete.
The remaining gas for entering hydrochloric acid absorption tower is absorbed, residue contains HCl and Cl2Gas pass through glass reinforced plastic offgas duct
Line enters the first hydrochloric acid absorption tower 2, and using a water circulation in the first hydrochloric acid absorption tower 2, chlorosulfonic acid tail gas is in the first hydrochloric acid
With a water counter current contacting in the packing layer of absorption tower, the HCl in tail gas is absorbed to generate hydrochloric acid, and tail gas passes through the first absorption by Hydrochloric Acid
Tower 2 enters back into the second hydrochloric acid absorption tower 3, and the HCl in the second hydrochloric acid absorption tower 3 in remaining tail gas is further predominantly absorbed.
The chemical recovery system is by the first alkali adsorption tower 4, the second alkali adsorption tower 4, the first alkali adsorption tower circulating pump, the second alkali
Absorption tower circulating pump composition.First alkali adsorption tower 4 and the second alkali adsorption tower 5 use carbon steel Fluorine-lined form, and equipment is carbon steel shell,
Liner F40.
Residual gas enters alkali adsorption tower, contains SO in the first alkali adsorption tower packing layer first2And Cl2Tail gas and 8%
Caustic soda circulation fluid counter current contacting, generate sodium sulfite substance, the SO in tail gas2It is sponged by soda bath, remnants contain Cl2
Tail gas enter the second alkali adsorption tower 5, contain Cl in the second alkali adsorption tower packing layer2Tail gas and 8% caustic soda circulation fluid
Counter current contacting generates sodium hypochlorite substance.
Tail gas buffer system is made of tail gas buffer 6, exhaust fan 7, chimney 8.As shown in Fig. 2, tail gas buffer 6 is
Horizontal type structure is classified as upper layer and lower layer by separation structure, bakie structure 13, the bottom of bakie structure 13 is provided on separation structure
Portion's opening, and be from top to bottom undergauge structure；
Tail gas buffer 6 further includes at least one baffle 10, and the top of tail gas buffer 6 is fixed at the top of baffle 10, gear
The bottom of plate 10 extends to the bottom of bakie structure 13, and reserves set distance with the bottom of bakie structure 13.
The quantity of bakie structure 13 is 1-10, can be 2,3,4,5,6,7,8 etc., bakie structure
Angle between 13 side wall and baffle 10 is 30 °, bakie structure 13 perpendicular to tail gas buffer 6 axial direction, and cover tail gas
The diameter of section of surge tank 6.
Gas after eventually passing through Pyatyi vent gas treatment enters tail gas buffer, will be up to standard after processing by exhaust fan
Tail gas is delivered to chimney emptying.It empties tail gas HCl and discharges content≤60mg/Nm3, empty SO in tail gas2Discharge content≤30mg/
Nm3。
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of chlorosulfonic acid produces exhaust treatment system, it is characterised in that: including sulfuric acid absorption tower, hydrochloric acid absorption tower, Alkali absorption
Tower, tail gas buffer and chimney, wherein
The central gas import of the sulfuric acid absorption tower is connect with tail gas source, and the concentrated sulfuric acid is contained in the tower reactor of bottom, and top is set
It is equipped with spray structure, bottom tower reactor is connect by the first pump with spray structure；
The central gas import of the hydrochloric acid absorption tower and the top gas of sulfuric acid absorption tower are exported and are connected, the bottom of hydrochloric acid absorption tower
Water is contained in portion's tower reactor, top is provided with spray structure, and bottom tower reactor is connect by the second pump with spray structure；
The top exit of the central gas import hydrochloric acid absorption tower of the alkali adsorption tower connects, and contains in the bottom tower reactor of alkali adsorption tower
Lye is filled, top is provided with spray structure, and bottom tower reactor is pumped by third and connect with spray structure；
The inlet exhaust gas and offgas outlet of tail gas buffer are all set in the top of tail gas buffer, inlet exhaust gas and alkali adsorption tower
Top exit connection, offgas outlet by the 4th pump connect with chimney.
2. chlorosulfonic acid according to claim 1 produces exhaust treatment system, it is characterised in that: the quantity of hydrochloric acid absorption tower is
It 1-3, connects between different hydrochloric acid absorption towers.
3. chlorosulfonic acid according to claim 1 produces exhaust treatment system, it is characterised in that: the quantity of alkali adsorption tower is 1-
It 3, connects between different alkali adsorption towers.
4. chlorosulfonic acid according to claim 1 produces exhaust treatment system, it is characterised in that: the tail gas buffer is sleeping
Formula structure is classified as upper layer and lower layer by separation structure, bakie structure is provided on separation structure, and the bottom of bakie structure is opened
Mouthful, and be from top to bottom undergauge structure；
Tail gas buffer further includes at least one baffle, the top of tail gas buffer is fixed at the top of baffle, the bottom of baffle is prolonged
The bottom of bakie structure is extended to, and reserves set distance with the bottom of bakie structure.
5. chlorosulfonic acid according to claim 4 produces exhaust treatment system, it is characterised in that: the quantity of bakie structure is 1-
10, be further 2-6, is further 3-6, the quantity of baffle is equal with the quantity of bakie structure.
6. chlorosulfonic acid according to claim 4 produces exhaust treatment system, it is characterised in that: the side wall and gear of bakie structure
Angle between plate is 20 ° -45 °.
7. chlorosulfonic acid according to claim 4 produces exhaust treatment system, it is characterised in that: the bakie structure vertical in
The axial direction of tail gas buffer, and cover the diameter of section of tail gas buffer.
8. a kind of chlorosulfonic acid produces exhaust gas treating method, characterized by the following steps:
Production tail gas from chlorosulfonic acid synthesis procedure enters in sulfuric acid absorption tower, under the circulated sprinkling of the concentrated sulfuric acid, removes life
Produce the sulfur trioxide in tail gas；
The production tail gas of sulfuric acid absorption tower outflow enters in hydrochloric acid absorption tower, under the circulated sprinkling of water, removes in production tail gas
HCl；
The production tail gas of hydrochloric acid absorption tower outflow enters alkali adsorption tower, under the circulated sprinkling of lye, removes in production tail gas
Sulfur dioxide；
The production tail gas flowed out in hydrochloric acid absorption tower is buffered through tail gas buffer, after gas-liquid separation, is pumped to smoke stack emission.
9. chlorosulfonic acid according to claim 8 produces exhaust gas treating method, it is characterised in that: the concentration of the concentrated sulfuric acid is
98-98.7%, mass percent.
10. chlorosulfonic acid according to claim 8 produces exhaust gas treating method, it is characterised in that: the concentration of the lye is
8-15%, mass percent.
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| CN201910662060.2A CN110433636B (en) | 2019-07-22 | 2019-07-22 | Chlorosulfonic acid production tail gas treatment system and method |
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| CN201910662060.2A CN110433636B (en) | 2019-07-22 | 2019-07-22 | Chlorosulfonic acid production tail gas treatment system and method |
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