CN206955655U - A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas - Google Patents
A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas Download PDFInfo
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- CN206955655U CN206955655U CN201720313391.1U CN201720313391U CN206955655U CN 206955655 U CN206955655 U CN 206955655U CN 201720313391 U CN201720313391 U CN 201720313391U CN 206955655 U CN206955655 U CN 206955655U
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Abstract
A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas is the utility model is related to, belongs to acid tail gas process field.The reactor includes the venturi-type eductors being sequentially connected with, and intermediate buffering groove and 2# crystallization settlers, described venturi-type eductors are connected with flue；Described venturi-type eductors also crystallize settler top open part with 2# by intermediate buffering groove and are connected, and described 2# crystallization settler top open parts are connected with liquid caustic soda tank；Described 2# crystallization settlers bottom is connected with centrifuge；The top that described centrifuge crystallizes settler by centrifuge mother liquor groove with 1# is connected；The middle and upper part of described 1# crystallization settlers is provided with liquid pump；Described liquid pump is connected with venturi-type eductors；The utility model is simple in construction, and easily transformation is promoted, and can effectively be absorbed the sulfur dioxide in sour gas, be turned waste into wealth simultaneously, is reduced vent gas treatment cost, can be widely popularized and use.
Description
Technical field：
The utility model belongs to acid tail gas process field, and in particular to one kind produces sulfurous using sulfur dioxide in tail gas
The reactor of sour sodium.
Background technology：
Fine chemistry industry such as pesticide industry is used in thionyl chloride raw material production process, can produce tail gas.In these tail gas
Containing sulfur dioxide, hydrogen chloride gas, a small amount of air and micro other foreign gases, and in such a tail gas oxidisability gas
Body content is considerably less, conventional processing mode be with absorbing by liquid caustic soda produce sewage enter subsequent treatment mode, this method due to
The high-salt wastewater of substantial amounts of sodium chloride-containing, sulfate, sulphite etc. is generated, pollutant is simply transformed into from a kind of form
Another form.There is part producer to absorb using low alkali solution (10%-35%) or aqueous sodium carbonate at present to produce
Sodium sulfite, main method are that tail gas is absorbed after removal of impurities with low concentration liquid caustic soda, are then concentrated by evaporation, and centrifuge system
Take sodium sulfite.
Meanwhile current reaction unit has：1st, reactor reacts --- and such a method is limited by reactor size, and initial stage throws
Money is high, and occurs salt crust in course of reaction and block bad cleaning, and the mixing of reactor gas-liquid contact is poor, often inhales
Receiving not exclusively causes hydrogen sulfide effusion to produce smell, it is necessary to multistage absorption.2nd, pot type bubbling reactor --- often absorb
Hydrogen sulfide effusion is not exclusively caused to produce smell, it is necessary to multistage absorption, and the aeration head or anemostat of pot type reaction bottom
Because easy salt crust blocks, the higher liquid caustic soda reaction of concentration can not be adapted to, causes overall filling liquid caustic soda and row's absorbing liquid more frequency
It is numerous, add operation difficulty 3, vapour-liquid contacting column --- using the tower structure of multistage tail gas absorption, gas-liquid counter current or following current
Contact, because sulfur dioxide and liquid caustic soda reaction belong to exothermic reaction, running temperature is higher, can only use stainless steel, instead
Process is answered to include absorption tower, circulating water chennel, equipment is more, and floor space is big, and initial investment is high, and operation maintenance is more difficult.
Existing chemical industry sulfur dioxide absorbs complex, the liquid typically used of method operation for producing sodium sulfite
Alkali concn subsequently can also be used and enter back into centrifuge after evaporative crystallization and can just obtain crystal sodium sulfite, energy consumption in 10%-35%
Cost is higher, and the sodium sulfite content produced is generally relatively low, without the market competitiveness.In consideration of it, utility model is a kind of real
Strong with property, the reaction unit for being adapted to production is the emphasis studied at present.
The content of the invention：
Change the deficiencies in the prior art, improve the content of sodium sulfite, while reduce the cost of production sodium sulfite, reduce
The operation of pilot process, preferably realizes industrialization.
The technical solution of the utility model is as follows：A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas,
Including the venturi-type eductors being sequentially connected with, intermediate buffering groove and 2# crystallization settlers, described venturi-type eductors and gas
Pipe is connected；Described venturi-type eductors crystallize settler top open part with 2# by intermediate buffering groove and are connected；Described
2# crystallization settler top open parts are connected with liquid caustic soda tank；Described 2# crystallization settlers bottom is connected with centrifuge；Described
The top that centrifuge crystallizes settler by centrifuge mother liquor groove with 1# is connected；The middle and upper part of described 1# crystallization settlers is provided with
Liquid pump；Described liquid pump is connected with venturi-type eductors；Described venturi-type eductors and intermediate buffering groove, described centre is delayed
Jet-bedding settles with 2# crystallization settlers, described 2# crystallization settlers and liquid caustic soda tank, described 2# crystallization settlers with 1# crystallizations
Device, described 2# crystallization settlers and centrifuge, described 1# crystallization settlers and centrifuge, described centrifuge are female with centrifugation
Liquid bath；Described centrifuge mother liquor groove and 1# crystallization settlers are logical between described 1# crystallization settlers and venturi-type eductors
Cross the connection of runner pipe body；Described centrifuge mother liquor groove is provided with liquid pump；Valve is provided with described body.
Venturi-type eductors described in the utility model are prior art, including venturi anemostat and venturi reaction
Device.
The method described in the utility model that sodium sulfite is produced using sulfur dioxide in tail gas, it is concretely comprised the following steps：Make
Tail gas is cleaned using prior art with before the present apparatus, removes dust therein, other impurities gas as far as possible, is ensured
Sulfur dioxide：Other gas flow volume ratio ＞ 10 that can be reacted with sodium sulfite:1.In alkali liquid tank equipped with concentration be 40% with
On alkali lye, tail gas enters venturi-type eductors through flue after removal of impurities, and the drive for passing through venturi anemostat first enters text
Liquid caustic soda solution reaction generation generation sodium sulfite solution and sodium hydrogensulfite in reactor in mound, with venturi reactor is molten
Liquid, the above-mentioned solution of generation is then flowed into 2# crystallization settlers through intermediate buffering groove, the Asia generated in 2# crystallization settlers
Niter cake and the liquid caustic soda reaction production sodium sulfite by being slowly added dropwise in liquid caustic soda tank, because reaction generates sodium sulfite solubility
It is lower than sodium hydrogensulfite and separate out, the vortex spun down of settler is crystallized to bottom, the above-mentioned crystalline substance in bottom finally by 2#
Then 2# is crystallized solution in settler and is delivered to by body by isolated aqueous 5% or so the sodium sulfite of centrifuge
1# crystallization settlers are carried out vortex crystallization sedimentation again, while are crystallized the liquid in settler by liquid pump absorption 1# and flowed back
Reaction is continued to participate in into venturi-type eductors, realizes circulation.It can be sent simultaneously when the sedimentation crystal of 1# crystallization settlers is more
Enter in centrifuge and centrifuged, obtain sodium sulfite crystal.Caused saturated sodium bisulfite solution is mother liquor in centrifugal process
Centrifuge mother liquor groove is delivered to, is then sent into through eccentric groove in 1# crystallization settlers and continues to participate in reaction.
Liquid caustic soda concentration described in the utility model is needed according to crystallization settler device temperature control sodium hydrogensulfite dissolving
Line of writing music is adjusted, and is calculated according to solubility curve bigger 5 percentage points than the sodium hydrogensulfite solubility under temperature of reactor
More than, generally liquid caustic soda concentration is 40-50%, it is too dense if the easy Crystallization Plugging pipeline of liquid caustic soda, ensure that sodium sulfite exists
Be in hypersaturated state in crystallization settler, and the substantial amounts of field demonstration of process, under similarity condition, liquid caustic soda concentration from
After 30% or so brings up to 50% or so, the sodium sulfite content of production can also rise (can originally be produced with thin liquid Alkali absorption
The sodium sulfite technique of 80%-90% contents improves 1-5 percentage points).
Using venturi diffusion tubular type in the utility model, it is only necessary to ensure that whole system maintains micro-vacuum state, for gas
The conveying of body provides power, ensure that scene without sulfur dioxide penetrating odor；
The control of position and rate of addition is added dropwise in liquid caustic soda described in the utility model：Saturated sodium sulfite and sulfur dioxide
Reaction generates part sodium hydrogensulfite, by controlling crystallization settler PH in 8-10, sulfurous acid during liquid caustic soda is added dropwise
Hydrogen sodium generates sodium sulfite with liquid caustic soda reaction, and sodium sulfite solubility is lower than sodium hydrogensulfite, so can be in saturated solution
Middle precipitation, in order to ensure the quick and complete reaction of liquid caustic soda energy, the dropwise addition position selection of liquid caustic soda is connected in dashpot with crystallization settler
Place, this position are exactly the concentration highest point that sodium hydrogensulfite contacts with settler, and dropwise reaction speed control can be with
Motor-driven valve is arranged to, can be done with the solution PH in system chain, Automated condtrol is realized, ensures crystallization settler PH in 8-
10。
The crystallization settler structure first half described in the utility model is tubular structure, and the latter half is conical bear building-up
Structure, this design upper-lower height ratio respectively account for half, and such reaction liquid flows naturally in settler is crystallized by liquid to be held very much
Vortex is easily formed, spun down separates sodium sulfite solid to settler bottom, and it is suspended that settler bottom discharge valve obtains solid
Liquid can be directly entered centrifuge and carry out common centrifugation operation, the step of reducing evaporating, concentrating and crystallizing, can save
100 yuan/ton or so of cost.
The advantages of the utility model：Practical, simple in construction, floor space is small, and production cost is low, shortens production week
Phase, sodium sulfite content is improved, reduces the process of evaporating, concentrating and crystallizing, is more suitable for industrialized production.The present apparatus can continue
Stable operation, and highly concentrated liquid caustic soda also increases absorbability, is advantageous to further reduce the floor space of processing equipment.Should
Method is especially suitable for sulfur dioxide concentration 2000mg/m3Tail gas above (need to ensure sulfur dioxide：Other energy and sulfurous acid
The gas flow volume ratio ＞ 10 of sodium reaction:1), can be by the sulfurous acid of former technique productions 80%-90% contents using the method
Sodium content improves 1-7 percentage points, reduces the cost that sodium sulfite is produced using tail gas.
Brief description of the drawings
Fig. 1 is the schematic device described in the utility model that sodium sulfite is produced using sulfur dioxide in tail gas；
1 is venturi-type eductors in figure, and 2 be liquid pump, and 3 be that 1# crystallizes settler, and 4 be centrifuge mother liquor groove, and 5 be centrifuge, 6
It is intermediate buffering groove for liquid caustic soda tank, 7,8 be that 2# crystallizes settler, and 9 be flue.
Embodiment
It is a kind of that the reactor of sodium sulfite is produced using sulfur dioxide in tail gas, including the venturi-type eductors being sequentially connected with
1, intermediate buffering groove 7 and 2# crystallization settlers 8, described venturi-type eductors 1 are connected with flue 9；Described venturi
Injector 1 crystallizes the top open part of settler 8 with 2# by intermediate buffering groove 7 and is connected；Open at the described top of 2# crystallizations settler 8
It is connected at mouthful with liquid caustic soda tank 6；The described 2# crystallizations bottom of settler 8 is connected with centrifuge 5；Described centrifuge 5 passes through centrifugation
Mother liquor tank 4 is connected with the top of 1# crystallization settlers 3；The middle and upper part of described 1# crystallization settlers 3 is provided with liquid pump 2；It is described
Liquid pump 2 be connected with venturi-type eductors 1；Described venturi-type eductors 1 and intermediate buffering groove 7, described intermediate buffering groove
7 settle with 2# crystallization settlers 8, described 2# crystallization settlers 8 and liquid caustic soda tank 6, described 2# crystallization settlers 8 with 1# crystallizations
Device 3, described 2# crystallization settlers 8 and centrifuge 5, described 1# crystallization settlers 3 and centrifuge 5, described centrifuge 5
With centrifuge mother liquor groove 4；Described centrifuge mother liquor groove 4 sprays with 1# crystallization settlers 3, described 1# crystallization settlers 3 with venturi
Connected between emitter 1 by the body that circulates；Described centrifuge mother liquor groove 4 is provided with liquid pump 2；It is provided with described body
Valve.
Claims (4)
- A kind of 1. reactor that sodium sulfite is produced using sulfur dioxide in tail gas, it is characterised in that：Including the text being sequentially connected with Injector (1) in mound, intermediate buffering groove (7) and 2# crystallization settlers (8), described venturi-type eductors (1) and flue (9) It is connected；Described venturi-type eductors (1) crystallize settler (8) top open part with 2# by intermediate buffering groove (7) and are connected； Described 2# crystallization settler (8) top open parts are connected with liquid caustic soda tank (6)；Described 2# crystallization settler (8) bottoms with from Scheming (5) is connected；The top that described centrifuge (5) crystallizes settler (3) by centrifuge mother liquor groove (4) with 1# is connected；It is described 1# crystallization settler (3) middle and upper part liquid pump (2) is installed；Described liquid pump (2) is connected with venturi-type eductors (1).
- 2. the reactor according to claim 1 that sodium sulfite is produced using sulfur dioxide in tail gas, it is characterised in that：Institute The venturi-type eductors (1) stated and intermediate buffering groove (7), described intermediate buffering groove (7) and 2# crystallization settlers (8), it is described 2# crystallization settler (8) with liquid caustic soda tank (6), described 2# crystallization settler (8) with 1# crystallization settler (3), described 2# Crystallize settler (8) with centrifuge (5), described 1# crystallization settler (3) with centrifuge (5), described centrifuge (5) with from Heart mother liquor tank (4)；Described centrifuge mother liquor groove (4) and 1# crystallization settlers (3), described 1# crystallization settlers (3) and literary mound In pass through the body that circulates between injector (1) and connect.
- 3. the reactor according to claim 2 that sodium sulfite is produced using sulfur dioxide in tail gas, it is characterised in that：Institute The centrifuge mother liquor groove (4) stated is provided with liquid pump (2).
- 4. the reactor according to claim 3 that sodium sulfite is produced using sulfur dioxide in tail gas, it is characterised in that：Institute Valve is provided with the body stated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720313391.1U CN206955655U (en) | 2017-03-28 | 2017-03-28 | A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas |
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| CN201720313391.1U CN206955655U (en) | 2017-03-28 | 2017-03-28 | A kind of reactor that sodium sulfite is produced using sulfur dioxide in tail gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557777A (en) * | 2018-03-13 | 2018-09-21 | 杨奕颉 | A kind of production technology of sodium sulfite |
| CN111298627A (en) * | 2019-12-13 | 2020-06-19 | 南京工业大学 | Flue gas desulfurization system and method |
-
2017
- 2017-03-28 CN CN201720313391.1U patent/CN206955655U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108557777A (en) * | 2018-03-13 | 2018-09-21 | 杨奕颉 | A kind of production technology of sodium sulfite |
| CN111298627A (en) * | 2019-12-13 | 2020-06-19 | 南京工业大学 | Flue gas desulfurization system and method |
| CN111298627B (en) * | 2019-12-13 | 2021-07-20 | 南京工业大学 | Flue gas desulfurization system and method |
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