CN108452611A - A kind of purification method of the tail gas of gas containing hydrogen chloride and magnesium chloride dust - Google Patents
A kind of purification method of the tail gas of gas containing hydrogen chloride and magnesium chloride dust Download PDFInfo
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- CN108452611A CN108452611A CN201810553407.5A CN201810553407A CN108452611A CN 108452611 A CN108452611 A CN 108452611A CN 201810553407 A CN201810553407 A CN 201810553407A CN 108452611 A CN108452611 A CN 108452611A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
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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
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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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Abstract
A kind of purification method of the tail gas of gas containing hydrogen chloride and magnesium chloride dust, including, the tail gas is delivered to stuffing washing tower 1, washs the magnesium chloride dust in tail gas, obtain first order tail gas by first step S1；Second step S2 washs the hydrogen chloride gas in first order tail gas, obtains second level tail gas；Third step S3 washs the hydrogen chloride gas in the tail gas of the second level, obtains third level tail gas；Four steps S4, by the third level exhaust emissions.The tail gas containing hydrogen chloride gas and magnesium chloride dust generated using this purification method processing magnesium chloride dewatering, has been reached environmental requirement, ensure that in entire processing procedure and be precipitated without magnesium chloride；It using a set of equipment, is washed by three-level, has saved cost, improve exhaust treatment efficiency；In purification process, portion washes waste water directly recycles in system, has saved and has used water.
Description
Technical field
The present invention relates to the field of exhaust gas purification of chemical industry and metallurgy industry, the especially electrolysises of magnesium chloride to produce magnesium metal process
The processing method of the exhaust gas of middle generation.
Background technology
Superiority and uniqueness of the magnesium metal due to its physical property, it has also become the extremely wide metal of current application foreground
Material, alloy product are widely used in the fields such as automobile, Aeronautics and Astronautics, electronics, are described as by material scholar " when substituting metal ".
Currently, the production method of magnesium metal is mainly using magnesite, carnallite and dolomite as the fused salt electrolysis process of raw material and thermal reduction
Method, this production method have that comprehensive energy consumption is higher, environmental pollution is serious, labor intensity is big, high-nickel material consumption is big etc. and lack
Point.The electrolytic magnesium technology of magnesium metal factory of Qinghai Salt Lake Mei Ye companies is that magnesium chloride is directly extracted from salt lake bittern, uses electrolysis
Method produces magnesium metal, and the core of the method is the dewatering of magnesium chloride.Wherein, air drying methods are the one of dewatering
Kind, hydrogen chloride gas and magnesium chloride dust are contained in tail gas, the content of magnesium chloride dust is less than 10% (mass percent), chlorine
The content for changing hydrogen is less than 0.1% (mass percent).The requirement of environmental protection, the index after above-mentioned tail gas clean-up is answered to should be chlorination
Magnesium powder dust concentration is less than 120mg/l, and chlorine hydride gas concentration is less than 100mg/l.It is that existing processing contains using scrubbing tower washing
A kind of method of dust tail gas, in the method for existing scrubbing tower washing method cleaning of off-gas, due to hydrogen chloride and magnesium chloride
Common-ion effect be easy to cause magnesium chloride and is precipitated in cleaning solution, in turn results in cleaning equipment blocking, influences purification function, lead
Exhaust emissions is caused not meet the requirement of environmental protection, the two kinds of substances handled respectively in exhaust gas can cause cost to increase again.
Invention content
Problem to be solved by this invention be purify magnesium chloride dehydration generate contain hydrogen chloride gas and magnesium chloride
The content of the tail gas of dust, gas containing hydrogen chloride and magnesium chloride dust in the tail gas, magnesium chloride dust is less than 10% (quality hundred
Divide ratio), the content of hydrogen chloride is less than 0.1% (mass percent).Purpose of the present invention is to so that the tail gas is reached ring after processing
Guaranteed request；And in processing procedure, the influence that overcomes magnesium chloride caused by common-ion effect to be easily precipitated；And a set of equipment is used,
The hydrogen chloride gas and magnesium chloride dust in exhaust gas are handled simultaneously, to save cost, improve efficiency.
To solve the above-mentioned problems, the present invention provides the purifications of a kind of gas containing hydrogen chloride and the tail gas of magnesium chloride dust
Method includes the following steps that the tail gas is delivered to stuffing washing tower 1, washs the magnesium chloride powder in tail gas by first step S1
Dirt obtains first order tail gas；The first order tail gas is delivered to bubble-cap scrubbing tower 2, washs first order tail gas by second step S2
In hydrogen chloride gas, obtain second level tail gas；The second level tail gas is delivered to filler fine purifiation tower 3, washed by third step S3
The hydrogen chloride gas in the tail gas of the second level is washed, third level tail gas is obtained；Four steps S4, by the third level exhaust emissions.
Cleaning solution in the stuffing washing tower 1 is collected, is delivered to after storage by a kind of embodiment according to the present invention
It is recycled in the stuffing washing tower 1；
Cleaning solution in the bubble-cap scrubbing tower 2 is collected, is delivered to recycle in the bubble-cap scrubbing tower 2 and makes after storage
With；And
Cleaning solution in the filler fine purifiation tower 3 is collected, is delivered to recycle in the filler fine purifiation tower 3 and makes after storage
With.
A kind of embodiment according to the present invention, in the stuffing washing tower 1, control cleaning solution in hydrogen cloride concentration and
Density of magnesium chloride makes hydrogen cloride concentration be less than 1%, makes density of magnesium chloride ranging from 25%-35%.
A kind of embodiment according to the present invention removes between first step S1 and second step S2 in first order tail gas
The drop of carrying.
A kind of embodiment according to the present invention controls hydrogen cloride concentration in cleaning solution in the bubble-cap scrubbing tower 2,
Make hydrogen cloride concentration ranging from 2%-4%.
A kind of embodiment according to the present invention, between second step S2 and third step S3, removing is suspended in second
Liquid foam in tail gas.
A kind of embodiment according to the present invention controls hydrogen cloride concentration in cleaning solution in the filler fine purifiation tower 3,
Hydrogen cloride concentration is set to be less than 1%.
A kind of embodiment according to the present invention, between third step S3 and four steps S4, removing is suspended in third
The liquid foam of grade tail gas
The washes of the filler fine purifiation tower 3 is delivered to the bubble-cap and washed by a kind of embodiment according to the present invention
Tower 2 is washed, the cleaning solution of the bubble-cap scrubbing tower is used as.
According to another aspect of the present invention, a kind of tail for handling gas containing hydrogen chloride and magnesium chloride dust is provided
The purification system of gas, wherein including, stuffing washing tower 1, bubble-cap scrubbing tower 2 and filler fine purifiation tower 3,
The stuffing washing tower 1 washs the magnesium chloride dust in the tail gas to obtain for receiving the tail gas
Level-one tail gas；
The bubble-cap scrubbing tower 2 is connect with the stuffing washing tower 1, for receiving the first order tail gas, and washs institute
The hydrogen chloride gas in first order tail gas is stated, to obtain second level tail gas；
The filler fine purifiation tower 3 is connect with the bubble-cap scrubbing tower 2, for receiving the second level tail gas, and further
The hydrogen chloride gas in the second level tail gas is washed, to obtain third level tail gas, and discharges the third level tail gas.
A kind of embodiment according to another aspect of the present invention, the stuffing washing tower 1 are pumped equipped with first circulation
14 and the first cleaning solution storage tank 13, the bubble-cap scrubbing tower 2 it is described equipped with second circulation pump 24 and the second cleaning solution storage tank 23
Filler fine purifiation tower 3 is equipped with third circulating pump 34 and third cleaning solution storage tank 33；
The first cleaning solution storage tank 13 is for receiving and storing the cleaning solution from the stuffing washing tower 1, and described the
One circulating pump 14 is used to the cleaning solution being stored in the first cleaning solution storage tank 13 being delivered in the stuffing washing tower 1,
To make cleaning solution in the stuffing washing tower 1 recycle；
The second cleaning solution storage tank 23 is for receiving and storing the cleaning solution from the bubble-cap scrubbing tower 2, and described the
Two circulating pumps 24 are used to the cleaning solution being stored in the second cleaning solution storage tank 23 being delivered in the bubble-cap scrubbing tower 2,
To make cleaning solution in the bubble-cap scrubbing tower 2 recycle；
The third cleaning solution storage tank 33 is for receiving and storing the cleaning solution from the filler fine purifiation tower 3, and described the
Three circulating pumps 34 are for the cleaning solution being stored in the third sink to be delivered in the filler fine purifiation tower 3, to make
Cleaning solution recycles in the filler fine purifiation tower 3.
A kind of embodiment according to another aspect of the present invention, the stuffing washing tower 1 is equipped with the first water supplement port
11 and first water outlet 12, first water supplement port 11 be used to supplement cleaning solution to the stuffing washing tower (1), described first goes out
The mouth of a river 12 is used to discharge the washes of the generation of the stuffing washing tower 1；First water supplement port 11 and first water outlet
12 match, the magnitude of recruitment of the cleaning solution for controlling the stuffing washing tower 1 and the discharge rate of washes, so that described fill out
Expect that hydrogen cloride concentration is less than 1% in cleaning solution in scrubbing tower 1, makes density of magnesium chloride ranging from 25%-35%.
A kind of embodiment according to another aspect of the present invention, the purification system further includes demister 4, described
Demister 4 is arranged between the bubble-cap scrubbing tower 2 and stuffing washing tower 1, is carried for removing in first exhaust gas flow
Drop.
A kind of embodiment according to another aspect of the present invention, the bubble-cap scrubbing tower 2 is equipped with the second water supplement port
21 and second water outlet 22, second water supplement port 21 be used to supplement cleaning solution, second water outlet to the bubble-cap scrubbing tower 2
The washes that mouth 22 is generated for discharging the bubble-cap scrubbing tower 2；
Second water supplement port 21 is matched with second water outlet 22, for controlling washing for the bubble-cap scrubbing tower 2
The magnitude of recruitment of liquid and the discharge rate of washes are washed, so that hydrogen cloride concentration is ranging from cleaning solution in the bubble-cap scrubbing tower 2
2%-4%.
A kind of embodiment according to another aspect of the present invention is provided with first at 2 top of the bubble-cap scrubbing tower
Foam-blocker 25, first foam-blocker 25 is for filtering out the liquid foam being suspended in the tail gas of the second level.
A kind of embodiment according to another aspect of the present invention, the filler fine purifiation tower 3 is equipped with third water supplement port
31 and third water outlet 32；The third water supplement port 31 is used to supplement cleaning solution, the third water outlet to the filler fine purifiation tower 3
The washes that mouth 32 is generated for discharging the filler fine purifiation tower 3.
The third water supplement port 31 is matched with second water outlet 32, for controlling washing for the filler fine purifiation tower 3
The magnitude of recruitment of liquid and the discharge rate of washes are washed, so that hydrogen cloride concentration is less than in cleaning solution in the filler fine purifiation tower 3
1%.
A kind of embodiment according to another aspect of the present invention is provided with tower top at 3 top of the filler fine purifiation tower
Second foam-blocker 35, second foam-blocker 35 is for filtering out the liquid foam being suspended in air-flow.
A kind of embodiment according to another aspect of the present invention, second water supplement port 21 and the third water outlet
32 connections, for conveying the washes of the filler fine purifiation tower 3 to the bubble-cap scrubbing tower 2 to make cleaning solution use.
By using exhaust purifying method of the present invention, magnesium chloride dewatering generate containing hydrogen chloride gas and
The tail gas of magnesium chloride dust disclosure satisfy that environmental requirement after processing (dust is less than 120mg/l, and HCL is less than 100mg/l)；And
In processing procedure, the technical difficulty that common-ion effect causes magnesium chloride to be precipitated is overcome, ensure that nothing in entire processing procedure
Magnesium chloride is precipitated, and avoids the blocking to equipment；It using a set of equipment, is washed by three-level, while handling the chlorination in exhaust gas
Hydrogen and magnesium chloride dust have saved cost, improve exhaust treatment efficiency；In purification process, portion washes waste water is being
It is directly recycled in system, has saved and used water.
Description of the drawings
Fig. 1 is the step schematic diagram of the purification method of the present invention；
Fig. 2 is the schematic diagram of purification system provided by the present invention；
Fig. 3 is another schematic diagram of purification system provided by the present invention；
Fig. 4 is the schematic diagram of the purification system provided by the present invention containing demister structure；
Fig. 5 is the schematic diagram of the purification system provided by the present invention containing foam-blocker structure；And
Fig. 6 is the schematic diagram of the purification system provided by the present invention with different connection types.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, and reference label refers to the group in the present invention
Part, technology, being realized under appropriate circumstances so as to advantages and features of the invention can be easier to be understood.Following description is pair
The materialization of the claims in the present invention, and also belong to power with the relevant other specific implementations not clearly stated of claim
The range that profit requires.
Following will be combined with the drawings in the embodiments of the present invention, and the present invention will be described.
Fig. 2 shows purification systems provided by the present invention.
As shown in Fig. 2, a kind of purification system for handling the tail gas of gas containing hydrogen chloride and magnesium chloride dust, including,
Stuffing washing tower 1, bubble-cap scrubbing tower 2 and filler fine purifiation tower 3, the stuffing washing tower 1 are washed for receiving the tail gas
Magnesium chloride dust in the tail gas is to obtain first order tail gas；The bubble-cap scrubbing tower 2 is connect with the stuffing washing tower 1,
For receiving the first order tail gas, and the hydrogen chloride gas in the first order tail gas is washed, to obtain second level tail gas；Institute
It states filler fine purifiation tower 3 to connect with the bubble-cap scrubbing tower 2, for receiving the second level tail gas, and further washs described
Hydrogen chloride gas in two level tail gas to obtain third level tail gas, and discharges the third level tail gas.
That invents existing or future can be used to have for the stuffing washing tower 1, bubble-cap scrubbing tower 2, filler fine purifiation tower 3
The scrubbing tower of corresponding construction, the present invention do not limit the model of scrubbing tower, parameter, can be according to the scale selection of vent gas treatment.
The first order tail gas is the most of magnesium chloride powder of removing by the tail gas after the washing of the stuffing washing tower 1
Dirt and partial oxidation hydrogen are formed by, and main component is hydrogen chloride gas and a small amount of magnesium chloride dust.
The second level tail gas is the most of chlorine of removing by the first order tail gas after the bubble-cap scrubbing tower 2 washing
Change hydrogen and a small amount of magnesium chloride dust is formed by, main component is a small amount of magnesium chloride dust and a small amount of hydrogen chloride gas.
The third tail gas be by the second level tail gas through the filler fine purifiation tower 3 washing after, further remove chlorination
It is formed after hydrogen and magnesium chloride dust, main component is micro magnesium chloride dust and micro hydrogen chloride gas.
Tail gas enters the stuffing washing tower 1, by washing, removes the magnesium chloride dust in tail gas, obtains first order tail
Gas；The first order tail gas is delivered to bubble-cap scrubbing tower 2 from stuffing washing tower 1, by washing, removes the chlorine in first order tail gas
Change hydrogen, obtains second level tail gas；The second level tail gas is delivered to filler fine purifiation tower 3, by washing, is further removed
Hydrogen chloride gas in the tail gas of the second level obtains third level tail gas, from filler fine purifiation tower 3 by third level exhaust emissions.
The tail gas is washed by the three-level of above-mentioned different modes, can make magnesium chloride dust and hydrogen chloride gas in tail gas
Clean-up effect it is more preferable, so that exhaust emissions is reached environmental protection standard.
Fig. 3 shows the cleaning solution loop control part in purification system provided by the present invention.
As shown in figure 3, the stuffing washing tower is equipped with first circulation pump 14 and the first cleaning solution storage tank 13, the bubble-cap
Scrubbing tower 2 is equipped with second circulation pump 24 and the second cleaning solution storage tank 23, and the filler fine purifiation tower 3 is equipped with third circulating pump 34
With third cleaning solution storage tank 33；The first cleaning solution storage tank 13 is for receiving and storing the washing from the stuffing washing tower
Liquid, the first circulation pump 14 are washed for the cleaning solution being stored in the first cleaning solution storage tank 13 to be delivered to the filler
It washs in tower, to make cleaning solution in the stuffing washing tower recycle；The second cleaning solution storage tank 23 is for receiving and depositing
The cleaning solution from the bubble-cap scrubbing tower 2 is stored up, the second circulation pump 24 will be for that will be stored in the second cleaning solution storage tank
Cleaning solution in 23 is delivered in the bubble-cap scrubbing tower 2, to make cleaning solution in the bubble-cap scrubbing tower 2 recycle；Institute
Third cleaning solution storage tank 33 is stated for receiving and storing the cleaning solution from the filler fine purifiation tower 3, the third circulating pump 34
For the cleaning solution being stored in the third sink to be delivered in the filler fine purifiation tower 3, to make the filler essence
Cleaning solution in tower 3 is washed to recycle.
The recycling of the cleaning solution has both sides advantageous effect.First, reducing in purification method of the present invention
The usage amount of washings saves water resource.Second, before as magnesium chloride in the follow-up recirculated water and hydrogen cloride concentration control
It carries.
As shown in figure 3, the stuffing washing tower 1 is mended equipped with the first water supplement port 11 and the first water outlet 12, described first
The mouth of a river 11 is used to supplement cleaning solution to the stuffing washing tower 1, and first water outlet 12 is for discharging the stuffing washing tower 1
The washes of generation；First water supplement port 11 is matched with first water outlet 12, for controlling the padding washing
The magnitude of recruitment of the cleaning solution of tower 1 and the discharge rate of washes, so that hydrogen cloride concentration in cleaning solution in the stuffing washing tower 1
Less than 1%, make density of magnesium chloride ranging from 25%-35%.
In specific implementation process, cleaning solution can use industry water, the industry water to refer to water quality requirement and marked according to country
Standard is suitable for the water of industrial use.Cleaning solution can also use water quality to use water better than other of the industry water.
Cleaning solution is entered after stuffing washing tower 1 by the first water supplement port 11 from the first cleaning solution storage tank 13 is flowed into, and is followed by first
Ring pump 14 is transported to stuffing washing tower 11 and carries out cycle washing.
In the stuffing washing tower 1, by adjusting the magnitude of recruitment of cleaning solution and the discharge rate of washes, it can control
The concentration of hydrogen chloride and magnesium chloride in circulating cleaning solution makes hydrogen cloride concentration be less than 1%, and density of magnesium chloride range is in 25%-
35%, density of magnesium chloride is preferably 30%.The control of cleaning solution intermediate ion concentration is so that precipitation of the common-ion effect to magnesium chloride
Influence is preferably minimized, and in entire washing process, does not have magnesium chloride precipitation, and the dosage of recirculated water can be optimized to most preferably
State, washes are the aqueous solution containing magnesium chloride and hydrogen chloride, collect post-processing.
Fig. 4 shows provided by the present invention a kind of for handling the net of the tail gas of gas containing hydrogen chloride and magnesium chloride dust
The demister structure of change system.
As shown in figure 4, the purification system further includes demister 4, the demister 4 is arranged in the bubble-cap scrubbing tower
Between 2 and stuffing washing tower 1, for removing the drop carried in air-flow.First order tail gas is discharged from the stuffing washing tower 1
When, the drop dissolved with magnesium chloride and hydrogen chloride can be carried.The demister 4 removes described the when first order tail gas passes through
The drop carried in level-one tail gas, and make in droplets fall back to the stuffing washing tower 1, it further reduced in first order tail gas
Entrained magnesium chloride and hydrogen chloride.
As shown in figure 3, the bubble-cap scrubbing tower 2 is mended equipped with the second water supplement port 21 and the second water outlet 22, described second
The mouth of a river 21 is used to supplement cleaning solution to the bubble-cap scrubbing tower 2, and second water outlet 22 is for discharging the bubble-cap scrubbing tower
The washes of generation；
Second water supplement port 21 is matched with second water outlet 22, for controlling washing for the bubble-cap scrubbing tower 2
The magnitude of recruitment of liquid and the discharge rate of washes are washed, so that hydrogen cloride concentration is ranging from cleaning solution in the bubble-cap scrubbing tower 2
2%-4%.
In the bubble-cap scrubbing tower 2, cleaning solution is entered by the second water supplement port 21 after bubble-cap scrubbing tower 2 to be washed from inflow second
Liquid storage tank 23 is washed, being transported to bubble-cap scrubbing tower 2 by second circulation pump 24 carries out cycle washing.By adjust cleaning solution magnitude of recruitment and
The discharge rate of washes, makes in circulating cleaning solution that hydrogen cloride concentration is within the scope of 2%-4%, and preferably 3%.Circulating cleaning solution
The control of middle hydrogen cloride concentration so that recirculated water preferably removes the first order to the enhanced dissolution rate of hydrogen chloride gas
Hydrogen chloride in tail gas, and further remove the magnesium chloride dust in first order tail gas.
Fig. 5 shows provided by the present invention a kind of for handling the net of the tail gas of gas containing hydrogen chloride and magnesium chloride dust
The foam-blocker structure of change system.
As shown in figure 5, being provided with the first foam-blocker 25 at 2 top of the bubble-cap scrubbing tower, first foam-blocker 25 is used
In filtering out the liquid foam being suspended in the tail gas of the second level.
Second level tail gas can carry the liquid foam taken out of from the bubble-cap scrubbing tower 2, in liquid foam dissolved with hydrogen chloride gas and
Magnesium chloride dust removes the liquid foam being suspended in the tail gas of the second level so that tail gas clean-up is more thorough by first foam-blocker 25
Bottom.
As shown in figure 3, the filler fine purifiation tower 3 is equipped with third water supplement port 31 and third water outlet 32；The third is mended
The mouth of a river 31 is used to supplement cleaning solution to the filler fine purifiation tower 3, and the third water outlet 32 is for discharging the filler fine purifiation tower 3
The washes of generation.
The third water supplement port (31) matches with second water outlet (32), for controlling the filler fine purifiation tower
(3) magnitude of recruitment of cleaning solution and the discharge rate of washes, so that hydrogen chloride is dense in cleaning solution in the filler fine purifiation tower (3)
Degree is less than 1%.
In the filler fine purifiation tower 3, cleaning solution is washed by flowing into third certainly after the entrance filler fine purifiation of third water supplement port 31 tower 3
Liquid storage tank 33 is washed, being transported to filler fine purifiation tower 3 by third circulating pump 34 carries out cycle washing.By the magnitude of recruitment for adjusting cleaning solution
And the discharge rate of washes, so that hydrogen cloride concentration in circulating cleaning solution is less than 1%.The control of hydrogen cloride concentration in cleaning solution,
Since the concentration of hydrogen chloride in cleaning solution is lower so that hydrogen chloride gas is more soluble in circulating cleaning solution, can further remove
Hydrogen chloride gas in the tail gas of the second level and magnesium chloride dust.
As shown in figure 5, being provided with the second foam-blocker of tower top 35, second foam-blocker at 3 top of the filler fine purifiation tower
35 for filtering out the liquid foam being suspended in air-flow.
Third level tail gas carries from the filler fine purifiation tower 3 and carries out liquid foam, and hydrogen chloride gas and chlorine are dissolved in liquid foam
Change magnesium dust, by second foam-blocker 35, removes the liquid foam being suspended in third level tail gas so that tail gas clean-up is more thorough
Bottom.
Fig. 6 shows a different connection type according to purification system provided by the present invention.
As shown in fig. 6, second water supplement port 21 is connect with the third water outlet 32.
Hydrogen cloride concentration is than hydrogen chloride in the cleaning solution of the filler fine purifiation tower 3 in the cleaning solution of the bubble-cap scrubbing tower 2
Concentration is high, can connect second water supplement port 21 for conveying the filler fine purifiation tower 3 with the third water outlet 32
Washes is to the bubble-cap scrubbing tower 2 to make cleaning solution use.
The washes of the filler fine purifiation tower 3 belongs to the hydrogen chloride solution of low concentration, is used as the bubble-cap washing
The cleaning solution of tower 2 can increase the solution rate of first order tail gas in the bubble-cap scrubbing tower 2, improve tail gas clean-up efficiency, and
And it and saves and uses water.
Fig. 1 shows the step schematic diagram of the purification method of the present invention.
As shown in Figure 1, the present invention also provides the purification method of a kind of gas containing hydrogen chloride and the tail gas of magnesium chloride dust,
Include the following steps,
The tail gas is delivered to stuffing washing tower 1, washs the magnesium chloride dust in tail gas by first step S1, obtains the
Level-one tail gas；The first order tail gas is delivered to bubble-cap scrubbing tower 2, washs the chlorination in first order tail gas by second step S2
Hydrogen obtains second level tail gas；The second level tail gas is delivered to filler fine purifiation tower 3, washs the second level by third step S3
Hydrogen chloride gas in tail gas obtains third level tail gas；Four steps S4, by the third level exhaust emissions.
According to embodiment of the present invention, the stuffing washing tower 1, the bubble-cap scrubbing tower 2 and filler essence
The cleaning solution washed in tower 3 recycles.
According to embodiment of the present invention, in the stuffing washing tower 1, control cleaning solution in hydrogen cloride concentration and
Density of magnesium chloride makes hydrogen cloride concentration be less than 1%, makes density of magnesium chloride ranging from
25%-35%.Preferably, it is 30% to make density of magnesium chloride.
According to embodiment of the present invention, it is removed in first order tail gas between first step S1 and second step S2
The drop of carrying.
According to embodiment of the present invention, in the bubble-cap scrubbing tower 2, hydrogen cloride concentration in cleaning solution is controlled,
Make hydrogen cloride concentration ranging from 2%-4%.Preferably, it is 3% to make hydrogen cloride concentration.
According to embodiment of the present invention, between second step S2 and third step S3, removing is suspended in second
Liquid foam in tail gas.
According to embodiment of the present invention, in the filler fine purifiation tower 3, hydrogen cloride concentration in cleaning solution is controlled,
Hydrogen cloride concentration is set to be less than 1%.
According to embodiment of the present invention, between third step S3 and four steps S4, removing is suspended in third
The liquid foam of grade tail gas.
According to embodiment of the present invention, the washes of the filler fine purifiation tower 3 bubble-cap is delivered to wash
Tower 2 is washed, the cleaning solution of the bubble-cap scrubbing tower 2 is used as.
The exhaust purifying method through the invention, dust concentration is less than 120mg/l, HCL in the tail emission
Gas concentration is less than 100mg/l, meets the requirement of environmental protection, and due to the control to hydrogen chloride in cleaning solution and density of magnesium chloride
System so that be precipitated without ratio of evaporation in entire method, avoid and result in blockage to scrubbing tower, improve vent gas treatment efficiency.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and this
Field technology personnel can design alternative embodiment without departing from the scope of the appended claims.In claim
In, any reference mark between bracket should not be configured to limitations on claims.
Claims (10)
1. a kind of purification method of the tail gas of gas containing hydrogen chloride and magnesium chloride dust, wherein include the following steps,
The tail gas is delivered to stuffing washing tower (1), washs the magnesium chloride dust in tail gas by first step (S1), obtains the
Level-one tail gas；
The first order tail gas is delivered to bubble-cap scrubbing tower (2), washs the hydrogen chloride in first order tail gas by second step (S2)
Gas obtains second level tail gas；
The second level tail gas is delivered to filler fine purifiation tower (3), washs the hydrogen chloride in the tail gas of the second level by third step (S3)
Gas obtains third level tail gas；
Four steps (S4), by the third level exhaust emissions.
2. purification method according to claim 1, wherein
Cleaning solution in the stuffing washing tower (1) is collected, cycle in the stuffing washing tower (1) is delivered to after storage makes
With；
Cleaning solution in the bubble-cap scrubbing tower (2) is collected, cycle in the bubble-cap scrubbing tower (2) is delivered to after storage makes
With；And
Cleaning solution in the filler fine purifiation tower (3) is collected, cycle in the filler fine purifiation tower (3) is delivered to after storage makes
With.
3. purification method according to claim 1, wherein in the stuffing washing tower (1), control chlorination in cleaning solution
Hydrogen concentration and density of magnesium chloride make hydrogen cloride concentration be less than 1%, make density of magnesium chloride ranging from 25%-35%.
4. purification method according to claim 1, wherein further comprise, in first step (S1) and second step
(S2) drop carried in first order tail gas is removed between.
5. purification method according to claim 1, wherein in the bubble-cap scrubbing tower (2), control chlorination in cleaning solution
Hydrogen concentration makes hydrogen cloride concentration ranging from 2%-4%.
6. purification method according to claim 5, wherein further comprise, in second step (S2) and third step
(S3) between, the liquid foam being suspended in the second tail gas is removed.
7. purification method according to claim 1, wherein in the filler fine purifiation tower (3), control chlorination in cleaning solution
Hydrogen concentration makes hydrogen cloride concentration be less than 1%.
8. purification method according to claim 1, wherein further comprise, in third step (S3) and four steps
(S4) between, the liquid foam for being suspended in third level tail gas is removed.
9. purification method according to claim 1, wherein the washes of the filler fine purifiation tower (3) is delivered to institute
Bubble-cap scrubbing tower (2) is stated, the cleaning solution of the bubble-cap scrubbing tower (2) is used as.
10. a kind of purification system for handling the tail gas of gas containing hydrogen chloride and magnesium chloride dust, including, stuffing washing tower
(1), bubble-cap scrubbing tower (2) and filler fine purifiation tower (3), wherein
The stuffing washing tower (1) washs the magnesium chloride dust in the tail gas to obtain first for receiving the tail gas
Grade tail gas；
The bubble-cap scrubbing tower (2) connect with the stuffing washing tower (1), for receiving the first order tail gas, and washs institute
The hydrogen chloride gas in first order tail gas is stated, to obtain second level tail gas；
The filler fine purifiation tower (3) connect with the bubble-cap scrubbing tower (2), for receiving the second level tail gas, and further
The hydrogen chloride gas in the second level tail gas is washed, to obtain third level tail gas, and discharges the third level tail gas.
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| CN114768476A (en) * | 2022-03-14 | 2022-07-22 | 宁夏盈氟金和科技有限公司 | Comprehensive treatment method for tailings, flue gas and dust produced by preparing anhydrous hydrogen fluoride |
| CN115888287A (en) * | 2022-11-17 | 2023-04-04 | 中国成达工程有限公司 | Hydrogen chloride and magnesium chloride dust tail gas treatment method |
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| CN115888287A (en) * | 2022-11-17 | 2023-04-04 | 中国成达工程有限公司 | Hydrogen chloride and magnesium chloride dust tail gas treatment method |
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Application publication date: 20180828 |