CN102995054B - Device and method for reducing free chlorine in output water of ionic exchange membrane cell - Google Patents
Device and method for reducing free chlorine in output water of ionic exchange membrane cell Download PDFInfo
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- CN102995054B CN102995054B CN201210549635.8A CN201210549635A CN102995054B CN 102995054 B CN102995054 B CN 102995054B CN 201210549635 A CN201210549635 A CN 201210549635A CN 102995054 B CN102995054 B CN 102995054B
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Abstract
The invention discloses a device and a method for reducing free chlorine in output water of an ionic exchange membrane cell. Light salt brine from the ionic exchange membrane cell enters a specially-designed light salt brine circulating pot. A vertical overflowing plate arranged in the circulating pot is used for dividing a water inlet and a water outlet into two parts; and an overflowing hole is arranged in the upper part of the overflowing plate. Circulating treatment of the circulating pot enables the light salt brine with the oversaturated free chlorine to be changed into the light salt brine with the saturated free chlorine; then the light salt brine is conveyed to a vacuum dechlorinating system through an automatic adjusting valve; the reduction of the free chlorine in the light salt brine reduces the load of vacuum dechlorinating and the normal operation of the dechlorinating system is stabilized; and a dechlorinating effect of the light salt brine is guaranteed and an index of the light salt brine for primary salt brine process salt is achieved.
Description
Technical field
The present invention relates to the light salt brine circulation and dechlorination process that produce in ion film caustic soda production process, particularly light salt brine dechlorination.
Background technology
At the popular and widely used light salt brine pump circulation of caustic soda production facilities and light salt brine vacuum pump dechlorination process, the key of its light salt brine dechlorination is the ability ensureing Free Chlorine in Brine content and vacuum system.In existing technique, light salt brine enters electrolyzer from common anode liquid bath component loops, and redundance pumps into dechlorination process, and this salt solution is supersaturation free chlorine salt solution, and free chlorine contents about controls at 1500 ~ 2500ppm, and after dechlorination, light salt brine content is 0.Free Chlorine in Brine content before this technique dechlorination is higher, be unfavorable for that gas-liquid separation makes electrolyzer circulation light salt brine contain a large amount of free chlorine, have an impact to ionic membrane especially needs long-time replacement cycles light salt brine free chlorine to be 0 to preserve to protect ionic membrane in docking process, part goes the light salt brine of dechlorination process to make dechlorination equipment operating load heavier because free chlorine contents is higher simultaneously, need the dechlorination equipment of larger ability, both added working cost, made again the corresponding increasing of operation easier; After dechlorination simultaneously, comparatively the present invention is high for free chlorine in brine content, increases the intractability of later process and consumes too much finishing agent.
Summary of the invention
The object of the present invention is to provide a kind of device and method reducing ion-exchange membrane electrolyzer circulation Free Chlorine in Brine concentration, free chlorine in circulation light salt brine still can be kept at low concentration when electrolyzer high loading, the light salt brine of low concentration free chlorine enters dechlorination load and the consumption that dechlorination apparatus can reduce dechlorination apparatus simultaneously, meets the requirement of primary brine technique light salt brine.
Reduce a device for ion-exchange membrane electrolyzer water outlet free chlorine, comprise electrolysis cycle device and light salt brine dechlorination apparatus, and between electrolysis cycle device and light salt brine dechlorination apparatus, add a light salt brine circulation tank.Light salt brine circulation tank comprises the chlorine outlet at tank body, overflow plate, water inlet, water outlet and circulation tank top, and wherein overflow plate is vertically placed in tank interior, and light salt brine circulation tank is divided into two portions, and water inlet and water outlet lay respectively at wherein a part of; Overflow plate top is provided with compact arranged overflow weir.
Described electrolysis cycle device comprises electrolyzer, gas-liquid separator and anode liquid bath.
Salt solution overflow plate height is about 70% ~ 90% of tank body height, and overflow weir distributes from top to bottom on overflow plate, and distribution range lower edge height is 70% ~ 85% of overflow plate height, and overflow weir area is 10 ~ 100cm
2(fixed according to design discharge).
Described overflow weir can be arbitrary shape, as long as area coinciding requirement, all can reach stirring action.
Reduce a method for ion-exchange membrane electrolyzer water outlet free chlorine, step is as follows:
1) ion-exchange membrane electrolyzer light salt brine out enters light salt brine circulation tank through transferpump from water inlet;
2) in light salt brine circulation tank, supersaturation free chlorine light salt brine, from the overflow weir of water inlet place part on overflow plate, flows into water outlet place part.
In light salt brine circulation tank, liquid level difference can be there is by the separated two portions of overflow plate, light salt brine is through overflow weir, the extruding of overflow weir to light salt brine causes the effect of the automatic stirring of light salt brine, light salt brine is through abundant disturbance, oversaturated free chlorine is separated out as the chlorine outlet of chlorine through circulation tank top is discharged from light salt brine, and Free Chlorine in Brine content is reduced to state of saturation.
3) after combination treatment, be pumped to dechlorinator and carry out further dechlorination in circulation groove;
After light salt brine goes out dechlorination system dechlorinator, successively adding finishing agent A and finishing agent B guarantees that on-line checkingi is without sending to primary brine workshop section after free chlorine.
Preferably, finishing agent A is selected from soda ash, caustic soda, clorox;
Preferably, finishing agent B is selected from clorox, S-WAT.
The invention has the beneficial effects as follows:
Existing installation does not need large improvement, increases a particular design light salt brine circulation groove and reduces light salt brine free chlorine contents, ensures that dechlorinating ability improves 10-30%, the light salt brine dechlorinating ability run under meeting ion film caustic soda electrolyzer higher load condition.
Apparatus of the present invention are produced simple, with low cost, and run simple and convenient, do not need additionally to provide power and reagent.
Compared with traditional technology, intermediate ion membrane electrolyser of the present invention goes dechlorination system Free Chlorine in Brine content to reduce about 1000ppm, effectively can reduce the operating load of dechlorination process, reduce the input of equipment and reagent in dechlorination process, reduce costs, and the light salt brine treatment capacity of dechlorination process can be improved.
Circulation device Free Chlorine in Brine content reduces can available protecting electrolyzer intermediate ion film, especially Programmed Stop or after stopping in emergency for the displacement of protection ionic membrane to chloride light salt brine is faster.
Accompanying drawing explanation
The light salt brine circulation that Fig. 1 conventional ion membrane cell electrolysis goes out and dechlorination process schema.
The light salt brine circulation that Fig. 2 ion-exchange membrane electrolyzer electrolysis of the present invention goes out and the schema of Dechlorination Process of depleted brine.
Fig. 3 light salt brine circulation tank of the present invention equipment schematic diagram.
The A-A of Fig. 4 embodiment 1 light salt brine circulation tank equipment is to sectional view.
The B-B of Fig. 5 embodiment 1 light salt brine circulation tank equipment is to sectional view.
Fig. 6 embodiment 1 overflow plate.
In figure: a is electrolyzer, b is gas-liquid separator, and c is that moist chlorine removes pipe network, d is supersaturation free chlorine light salt brine, e is anode liquid bath, and f is dechlorinator, and g is light salt brine circulation groove, h is saturated free chlorine light salt brine, N1 is chlorine outlet, and N2 is light salt brine entrance, and N3 is light salt brine outlet, 1 is light salt brine overflow plate, and 2 is light salt brine overflow weir.
Embodiment
With specific embodiment, technical scheme of the present invention is described below, but protection scope of the present invention is not limited thereto:
Embodiment 1
1) before 120,000 tons of electrolysis light salt brine out enters light salt brine circulation tank, free chlorine contents is 2350ppm;
2) light salt brine enters light salt brine circulation tank, and overflow plate height is 70% of tank body height, and overflow weir shape is circular, and area is 30cm
2, distribution range lower edge height is that the 80%(of overflow plate height is shown in Fig. 4,5,6).Enter the light salt brine after light salt brine circulation tank through the overflow of overflow plate place, in tank, abundant disturbance, makes free chlorine separate out as far as possible as chlorine.
3) light salt brine circulation tank light salt brine 100m out
3/ h, free chlorine contents is 1080ppm, and the clearance of chlorine is 54%.Send to dechlorination system by variable valve, keep dechlorinator vacuum tightness 36KPa, after going out dechlorinator, add finishing agent A(caustic soda) with finishing agent B(S-WAT), on-line checkingi free chlorine is zero send to primary brine workshop section.
Embodiment 2
1) before 160,000 tons of electrolysis light salt brine out enters light salt brine circulation tank, free chlorine contents is 1780ppm;
2) light salt brine enters light salt brine circulation tank, and overflow plate height is 80% of tank body height, and overflow weir shape is square, and area is 10cm
2, distribution range lower edge height is 70% of overflow plate height.Enter the light salt brine after light salt brine circulation tank through the overflow of overflow plate place, in tank, abundant disturbance, makes free chlorine separate out as far as possible as chlorine.
3) 160,000 tons of electrolysis light salt brine 130m out
3/ h, free chlorine contents is 850ppm, and the clearance of chlorine is 52%.Send to dechlorination system by variable valve and send to dechlorination system by variable valve, keep dechlorinator vacuum tightness 34KPa, after going out dechlorinator, add finishing agent A(soda ash) and finishing agent B(S-WAT), on-line checkingi free chlorine is zero send to primary brine workshop section.
Embodiment 3
1) before 150,000 tons of electrolysis light salt brine out enters light salt brine circulation tank, free chlorine contents is 1920ppm;
2) light salt brine enters light salt brine circulation tank, and overflow plate height is 90% of tank body height, and overflow weir shape is pentagon, and area is 60cm
2, distribution range lower edge height is 85% of overflow plate height.Enter the light salt brine after light salt brine circulation tank through the overflow of overflow plate place, in tank, abundant disturbance, makes free chlorine separate out as far as possible as chlorine.
3) 150,000 tons of electrolysis light salt brine 120m out
3/ h, free chlorine contents is 900ppm, and the clearance of chlorine is 53%.Send to dechlorination system by variable valve and send to dechlorination system by variable valve, keep dechlorinator vacuum tightness 34KPa, after going out dechlorinator, add finishing agent A(clorox) and finishing agent B(S-WAT), on-line checkingi free chlorine is zero send to primary brine workshop section.
Embodiment 4
1) before 140,000 tons of electrolysis light salt brine out enters light salt brine circulation tank, free chlorine contents is 2100ppm;
2) light salt brine enters light salt brine circulation tank, and overflow plate height is 75% of tank body height, and overflow weir shape is arbitrary shape, and area is 80cm
2, distribution range lower edge height is 80% of overflow plate height.Enter the light salt brine after light salt brine circulation tank through the overflow of overflow plate place, in tank, abundant disturbance, makes free chlorine separate out as far as possible as chlorine.
3) 140,000 tons of electrolysis light salt brine 110m out
3/ h, free chlorine contents is 960ppm, and the clearance of chlorine is 54%.Send to dechlorination system by variable valve and send to dechlorination system by variable valve, keep dechlorinator vacuum tightness 34KPa, after going out dechlorinator, add finishing agent A(soda ash) and finishing agent B(clorox), on-line checkingi free chlorine is zero send to primary brine workshop section.
Embodiment 5
1) before 130,000 tons of electrolysis light salt brine out enters light salt brine circulation tank, free chlorine contents is 2250ppm;
2) light salt brine enters light salt brine circulation tank, and overflow plate height is 85% of tank body height, and overflow weir shape is arbitrary shape, and area is 100cm
2, distribution range lower edge height is 75% of overflow plate height.Enter the light salt brine after light salt brine circulation tank through the overflow of overflow plate place, in tank, abundant disturbance, makes free chlorine separate out as far as possible as chlorine.
3) 130,000 tons of electrolysis light salt brine 120m out
3/ h, free chlorine contents is 1050ppm, and the clearance of chlorine is 53%.Send to dechlorination system by variable valve and send to dechlorination system by variable valve, keep dechlorinator vacuum tightness 34KPa, after going out dechlorinator, add finishing agent A(caustic soda) and finishing agent B(S-WAT), on-line checkingi free chlorine is zero send to primary brine workshop section.
Claims (2)
1. reduce a device for ion-exchange membrane electrolyzer water outlet free chlorine, comprise electrolysis cycle device and light salt brine dechlorination apparatus, it is characterized in that between electrolysis cycle device and light salt brine dechlorination apparatus, add a light salt brine circulation tank; Light salt brine circulation tank comprises the chlorine outlet at tank body, overflow plate, water inlet, water outlet and circulation tank top, and wherein overflow plate is vertically placed in tank interior, and light salt brine circulation tank is divided into two portions, and water inlet and water outlet lay respectively at wherein a part of; Overflow plate top is provided with the overflow weir of compact arranged arbitrary shape;
Salt solution overflow plate height is 70% ~ 90% of tank body height;
Overflow weir distributes from top to bottom on overflow plate, and distribution range lower edge height is 70% ~ 85% of overflow plate height;
Overflow weir area is 10 ~ 100cm
2.
2. a using method for the device as described in claim 1, is characterized in that step is as follows:
(1) ion-exchange membrane electrolyzer light salt brine out enters light salt brine circulation tank through transferpump from water inlet;
(2) in light salt brine circulation tank, supersaturation free chlorine light salt brine is from the overflow of water inlet place part on overflow plate
Hole, flow into water outlet place part, light salt brine is through the abundant extruding disturbance of overflow weir, and oversaturated free chlorine is analysed from light salt brine
Go out for the chlorine outlet of chlorine through circulation tank top is discharged, Free Chlorine in Brine content is reduced to state of saturation;
(3) after combination treatment, be pumped to dechlorinator and carry out further dechlorination in circulation groove.
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| CN201210549635.8A CN102995054B (en) | 2012-12-17 | 2012-12-17 | Device and method for reducing free chlorine in output water of ionic exchange membrane cell |
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|---|---|---|---|
| CN201210549635.8A CN102995054B (en) | 2012-12-17 | 2012-12-17 | Device and method for reducing free chlorine in output water of ionic exchange membrane cell |
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| CN102995054A CN102995054A (en) | 2013-03-27 |
| CN102995054B true CN102995054B (en) | 2015-06-17 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567283A (en) * | 1995-09-28 | 1996-10-22 | Lynn; Scott | Caustic concentration regulator for chlorine generators |
| CN101298004A (en) * | 2008-01-18 | 2008-11-05 | 杨解定 | Vapor-liquid separator |
| CN202430297U (en) * | 2011-12-13 | 2012-09-12 | 宜宾天原集团股份有限公司 | Chlorine removal system with ionic membrane chlorine valve internal water seal |
-
2012
- 2012-12-17 CN CN201210549635.8A patent/CN102995054B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5567283A (en) * | 1995-09-28 | 1996-10-22 | Lynn; Scott | Caustic concentration regulator for chlorine generators |
| CN101298004A (en) * | 2008-01-18 | 2008-11-05 | 杨解定 | Vapor-liquid separator |
| CN202430297U (en) * | 2011-12-13 | 2012-09-12 | 宜宾天原集团股份有限公司 | Chlorine removal system with ionic membrane chlorine valve internal water seal |
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| CN102995054A (en) | 2013-03-27 |
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