CN104928716B - Light salt brine pretreatment device - Google Patents
Light salt brine pretreatment device Download PDFInfo
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- CN104928716B CN104928716B CN201510273198.5A CN201510273198A CN104928716B CN 104928716 B CN104928716 B CN 104928716B CN 201510273198 A CN201510273198 A CN 201510273198A CN 104928716 B CN104928716 B CN 104928716B
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- salt brine
- liquid
- sodium sulfite
- hydrochloric acid
- light salt
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Abstract
The invention relates to a light salt brine pretreatment device. The innovation point is that the light salt brine pretreatment device comprises a salt brine heat exchanger, a circulating pipeline, a sodium sulfite dropwise-adding device and a diluted hydrochloric acid dropwise-adding device, wherein a refrigerant inlet of the salt brine heat exchanger is communicated with light salt brine supply equipment by a pipeline K; a refrigerant outlet of the salt brine heat exchanger is communicated with a light salt brine storage tank by a pipeline L; the two ends of the circulating pipeline are communicated with the bottom of the light salt brine storage tank and the pipeline K respectively; and the sodium sulfite dropwise-adding device and the diluted hydrochloric acid dropwise-adding device are arranged on the pipeline K and the pipeline L. The light salt brine pretreatment device has the advantages that: the initial temperature of the light salt brine entering heat concentration equipment is increased by utilizing the salt brine heat exchanger, and the heat consumption is reduced; the sodium sulfite dropwise-adding device, the diluted hydrochloric acid dropwise-adding device and the salt brine heat exchanger are matched for dissolving chlorate in the light salt brine and regulating the pH value of the light salt brine, so that the light salt brine is controlled to be alkalescent, and the service life of the heat concentration equipment in a next process is prolonged.
Description
Technical field
The present invention relates to a kind of heat-exchanger rig, more particularly to a kind of light salt brine pretreatment unit.
Background technology
Chlor-alkali industry mainly makes Related product using two kinds of production technologies of diaphragm process and ion-exchange membrane electrolysis, in ionic membrane
In the production process of electrolysis, Jing after electrolysis, its salt content can be down to 200g/L or so to electrolyte from 300 ~ 310g/L, need weight
The new salt content for improving electrolyte is to initial level to continue electrolysis production product.
Mainly salt content is improved using two ways at present, the first is that, using pure solid salt, its shortcoming is：Giving birth to
When producing caustic soda, alkali per ton needs the solid salt for consuming 1.5 tons, and its is relatively costly, substantially little not with the market competitiveness
Using；Second is by the way of the low electrolyte of salt content adds a large amount of solid salts to combine, i.e., using Jing electrolysises with ion-exchange film
Rear electrolyte or in addition buying bittern are substituting fraction solids salt, then solid salt is put in bittern reaching electrolyte
Saliferous standard, because electrolyte under unit salt content same case or bittern price are less than solid salt, therefore can substantially reduce
Cost, this kind of mode is generally adopted by most of producers in industry；The third is to add a small amount of solid using strong brine
The mode of salt, using heat pump techniques or other hot concentration techniques electrolyte low to salt content（Light salt brine）Or bittern carry out it is dense
Contracting, it compares the second way, can further reduce the addition of solid salt, reduces cost.
But free chlorine is typically contained in electrolyte or bittern, its corrosivity to concentrator is larger, therefore research and development one
The light salt brine pretreatment unit that kind can reduce electrolytic corrosion prolongation concentrator service life is imperative.
The content of the invention
The technical problem to be solved in the present invention be to provide one kind can reduce electrolytic corrosion and improve light salt brine it is initial
The light salt brine pretreatment unit of temperature.
To solve above-mentioned technical problem, the technical scheme is that：A kind of light salt brine pretreatment unit, its innovative point exists
In：Including brine heat exchanger, light salt brine supply arrangement, light salt brine storage tank, circulating line, sodium sulfite Dropping feeder and watery hydrochloric acid
Dropping feeder, brine heat exchanger includes tube side portion and shell side portion, and tube side portion has a Heating medium and a heating agent outlet, shell
Journey portion has a refrigerant import and a refrigerant exit, and the refrigerant import is connected by pipeline K with a light salt brine supply arrangement,
Refrigerant exit is connected by pipeline L with a light salt brine storage tank；Circulating line, inlet and the light salt brine bottom of storage tank of the circulating line
Portion connects, and liquid outlet is connected with pipeline K, and circulating pump is provided with circulating line；Sodium sulfite Dropping feeder includes sulfurous
Sour sodium prepares kettle, sodium sulfite and pump is added dropwise, and the sodium sulfite prepares the top of kettle and there is a sodium sulfite to match somebody with somebody liquid import and
Solid sodium sulfite charging aperture, sodium sulfite is added dropwise the inlet of pump and connects with the bottom of sodium sulfite preparation kettle, sodium sulfite
The pipeline K on rear side of the liquid outlet of pump access circulating line liquid outlet is added dropwise；Watery hydrochloric acid Dropping feeder includes that watery hydrochloric acid prepares kettle, dilute
Hydrochloric acid is added dropwise pump, and the watery hydrochloric acid prepares the top of kettle and has a watery hydrochloric acid with liquid import and a pressure-equalizing pipe, watery hydrochloric acid
The inlet and watery hydrochloric acid that pump is added dropwise is prepared bottom portion and is connected, and watery hydrochloric acid is added dropwise the liquid outlet of pump and connects with pipeline L；Configuration liquid is supplied
Include matching somebody with somebody liquid arm with liquid arm and hydrochloric acid with liquid house steward and with the sodium sulfite connected with liquid house steward's liquid outlet to pipeline, match somebody with somebody
The inlet of liquid house steward accesses the pipeline K on front side of circulating line liquid outlet, and sodium sulfite matches somebody with somebody liquid arm with liquid arm and hydrochloric acid
Liquid outlet matches somebody with somebody liquid inlet communication with sodium sulfite with liquid import, watery hydrochloric acid respectively.
Preferably, the sodium sulfite ends with sodium sulfite is separately installed with liquid arm with liquid arm and hydrochloric acid with liquid
Valve and hydrochloric acid match somebody with somebody liquid stop valve.
Preferably, sampling pipe is provided with the pipeline K, and PH detectors is provided with sampling pipe and is aoxidized also
The output signal of former current potential in-line analyzer, the PH detectors and oxidation-reduction potential in-line analyzer accesses sodium sulfite drop
Plus pump and watery hydrochloric acid are added dropwise pump.
It is an advantage of the current invention that：
The Heating medium of brine heat exchanger is connected to concentrate the hot concentrator of light salt brine, the strong brine temperature after concentration
Degree be generally capable of up to more than 180 DEG C, in being conducted into brine heat exchanger, be electrolysed using ion-exchange membrane electrolysis after light salt
Water carries out heat exchange in brine heat exchanger, and 65 DEG C or so of light salt brine is heated to into 95 DEG C or so, exists to lift light salt brine
Into the initial temperature of hot concentrator, heat consumption, more energy-conservation are reduced.
Light salt brine after ion-exchange membrane electrolysis electrolysis before brine heat exchanger, first by sodium sulfite Dropping feeder
Sodium sulfite solution is added dropwise in light salt brine, because light salt brine is alkalescence, meanwhile, after brine heat exchanger, light salt brine temperature
Lifting reaches 90 DEG C, and the decomposition to chlorate in light salt brine is conducive under the conditions of being somebody's turn to do, and greatly reduces corrosivity, improves overall system
The service life of system；And after heat exchange, proper amount of watery hydrochloric acid, and then the pH value of regulation light salt brine are added dropwise in light salt brine,
By light salt brine control in alkalescent, extend the service life of the hot concentrator of later process.
PH detectors and oxidation-reduction potential in-line analyzer are set on sampling pipe, so as to detect light salt brine pH value and
Redox condition, and then the dropwise addition of watery hydrochloric acid and sodium sulfite solution is controlled, it is advantageously implemented Automated condtrol.
Description of the drawings
Fig. 1 is light salt brine pretreatment unit structural representation of the present invention.
Specific embodiment
As shown in figure 1, including brine heat exchanger 3, light salt brine supply arrangement, light salt brine storage tank 4, circulating line N, sulfurous acid
Sodium Dropping feeder and watery hydrochloric acid Dropping feeder.
Brine heat exchanger 3 includes tube side portion and shell side portion, and tube side portion has a Heating medium 31 and a heating agent outlet
32, Heating medium 31 is used to connect the strong brine that light salt brine concentrator concentrates out, and shell side portion has a refrigerant import 33
With a refrigerant exit 34, the refrigerant import 33 connected by pipeline K with a light salt brine supply arrangement, and refrigerant exit 34 is by pipe
Road L is connected with a light salt brine storage tank 4.
The inlet of circulating line N, circulating line N is connected with the bottom of light salt brine storage tank 4, and liquid outlet is connected with pipeline K,
And circulating pump 43 is provided with circulating line N, brine heat exchanger 3, light salt brine is stored up by pipeline K, pipeline L, circulating line N
Tank 4, circulating pump 43 constitute a light salt brine warm-up cycle pipeline.
Sodium sulfite Dropping feeder includes that sodium sulfite prepares kettle 51, sodium sulfite and pump 52 is added dropwise, and sodium sulfite prepares kettle
There is a sodium sulfite to match somebody with somebody the solid sodium sulfite charging aperture 512 of liquid import 511 and at 51 top, and sodium sulfite is added dropwise pump 52
The bottom that inlet prepares kettle 51 with sodium sulfite connects, and sodium sulfite is added dropwise the liquid outlet access circulating line N of pump 52 and goes out liquid
Pipeline K on rear side of mouthful.
Watery hydrochloric acid Dropping feeder includes that watery hydrochloric acid prepares kettle 61, watery hydrochloric acid and pump 62 is added dropwise, and watery hydrochloric acid prepares the top of kettle 61
Match somebody with somebody the pressure-equalizing pipe 612 of liquid import 611 and with a watery hydrochloric acid, watery hydrochloric acid is added dropwise the inlet of pump 62 and watery hydrochloric acid is prepared
The bottom of kettle 61 connects, and watery hydrochloric acid is added dropwise the liquid outlet of pump 62 and connects with pipeline L.
Configuration liquid service is included with liquid house steward P and with the sodium sulfite connected with liquid house steward's P liquid outlets with liquid
Pipe Q and hydrochloric acid match somebody with somebody liquid arm R, and the inlet with liquid house steward accesses the pipeline K on front side of circulating line N liquid outlets, and sodium sulfite is matched somebody with somebody
The liquid outlet of liquid arm Q and hydrochloric acid with liquid arm R connects respectively with liquid import 511, watery hydrochloric acid with sodium sulfite with liquid import 611
It is logical.And match somebody with somebody liquid stop valve 513 and salt with sodium sulfite is separately installed with liquid arm R with liquid arm Q and hydrochloric acid in sodium sulfite
Liquid stop valve 613 is matched somebody with somebody in acid.
As the present invention more specifically embodiment：Sampling pipe O is provided with pipeline K, and is set on sampling pipe O
PH detectors 71 and oxidation-reduction potential in-line analyzer 72 are equipped with, the PH detectors 71 and oxidation-reduction potential in-line analyzer
72 output signal accesses sodium sulfite and pump 51 and watery hydrochloric acid dropwise addition pump 61 is added dropwise by DCS or PLC, to detect light salt brine
PH value and redox condition, and then the dropwise addition of watery hydrochloric acid and sodium sulfite solution is controlled, it is advantageously implemented Automated condtrol.
Operation principle：
Ion-exchange membrane electrolysis electrolysis after light salt brine in into pipeline K, can by with tubing giving sufficient strength P, with tubing giving sufficient strength Q, match somebody with somebody
Tubing giving sufficient strength R and thereon sodium sulfite enter sodium sulfite preparation kettle, watery hydrochloric acid and match somebody with somebody with liquid stop valve and hydrochloric acid with liquid stop valve
Kettle processed, to prepare sodium sulfite solution and watery hydrochloric acid the light salt brine solvent without exogenous impurity is provided；
Typically at 65 DEG C or so, it passes through pipeline K into brine heat exchanger to light salt brine after ion-exchange membrane electrolysis electrolysis
Shell side part, and the strong brine temperature after hot concentrator is concentrated reaches 180 DEG C, strong brine enters salt by Heating medium
The tube side part of water- to-water heat exchanger, with light salt brine heat exchange is carried out, and then light salt brine is heated to into 90-95 DEG C；
Light salt brine after ion-exchange membrane electrolysis electrolysis is utilized before the shell side part that brine heat exchanger is entered by pipeline K
Sodium sulfite is added dropwise pump and sodium sulfite solution of the concentration 4% or so is added dropwise in pipeline K；Because light salt brine is alkalescence, meanwhile,
After brine heat exchanger, light salt brine temperature is lifted and reaches more than 90 DEG C, is beneficial to divide chlorate in light salt brine under the conditions of being somebody's turn to do
Solution, reduces light salt brine to equipment, the corrosion of pipeline；
Through heating light salt brine by pipeline L enter light salt brine storage tank when, using watery hydrochloric acid be added dropwise pump in pipeline L
Watery hydrochloric acid is added dropwise, the pH value of light salt brine is adjusted using watery hydrochloric acid, by the control of light salt brine acid-base value in weak base state, extended
The service life of the hot concentrator of later process, is also beneficial to lift hot concentrator byproduct quality, such as using hydrogen chloride
The steam quality produced during synthesis light salt brine concentration stove concentration light salt brine.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The skill of the industry
Simply explanation of the art personnel it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and specification
The principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these
Changes and improvements are both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and
Its equivalent thereof.
Claims (3)
1. a kind of light salt brine pretreatment unit, it is characterised in that：Including brine heat exchanger, light salt brine supply arrangement, light salt brine storage
Tank, circulating line, sodium sulfite Dropping feeder and watery hydrochloric acid Dropping feeder,
Brine heat exchanger includes tube side portion and shell side portion, and tube side portion has a Heating medium and a heating agent outlet, shell side portion
With a refrigerant import and a refrigerant exit, the refrigerant import is connected by pipeline K with a light salt brine supply arrangement, refrigerant
Outlet is connected by pipeline L with a light salt brine storage tank；
Circulating line, the inlet of the circulating line is connected with light salt brine tank bottom, and liquid outlet is connected with pipeline K, and is being followed
Endless tube is provided with circulating pump on road；
Sodium sulfite Dropping feeder includes that sodium sulfite prepares kettle, sodium sulfite and pump is added dropwise, and the sodium sulfite prepares the top of kettle
Portion has a sodium sulfite with liquid import and a solid sodium sulfite charging aperture, and sodium sulfite is added dropwise the inlet and sulfurous acid of pump
Sodium prepares the bottom connection of kettle, and sodium sulfite is added dropwise the pipeline K on rear side of the liquid outlet of pump access circulating line liquid outlet；
Watery hydrochloric acid Dropping feeder includes that watery hydrochloric acid prepares kettle, watery hydrochloric acid and pump is added dropwise, and the watery hydrochloric acid prepares the top of kettle and has one
Individual watery hydrochloric acid is with liquid import and a pressure-equalizing pipe, and watery hydrochloric acid is added dropwise the inlet of pump and watery hydrochloric acid is prepared bottom portion and connected, dilute
Hydrochloric acid is added dropwise the liquid outlet of pump and connects with pipeline L；
Configuration liquid service is included with liquid house steward and with the sodium sulfite connected with liquid house steward's liquid outlet with liquid arm and salt
Liquid arm is matched somebody with somebody in acid, and the inlet with liquid house steward accesses the pipeline K on front side of circulating line liquid outlet, and sodium sulfite is with liquid arm and salt
Liquid outlet of the acid with liquid arm matches somebody with somebody liquid inlet communication with sodium sulfite with liquid import, watery hydrochloric acid respectively.
2. light salt brine pretreatment unit according to claim 1, it is characterised in that：The sodium sulfite is with liquid arm and salt
Acid matches somebody with somebody liquid stop valve with sodium sulfite is separately installed with liquid arm with liquid stop valve and hydrochloric acid.
3. light salt brine pretreatment unit according to claim 1, it is characterised in that：Probe tube is provided with the pipeline K
Road, and PH detectors and oxidation-reduction potential in-line analyzer are provided with sampling pipe, the PH detectors and oxidation are also
The output signal of former current potential in-line analyzer accesses sodium sulfite and pump and watery hydrochloric acid dropwise addition pump is added dropwise.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510273198.5A CN104928716B (en) | 2015-05-26 | 2015-05-26 | Light salt brine pretreatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510273198.5A CN104928716B (en) | 2015-05-26 | 2015-05-26 | Light salt brine pretreatment device |
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| CN104928716A CN104928716A (en) | 2015-09-23 |
| CN104928716B true CN104928716B (en) | 2017-05-10 |
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| CN106065484B (en) * | 2016-08-03 | 2018-02-02 | 金川集团股份有限公司 | A kind of ion-exchange membrane electrolyzer anode means for feeding acid and method |
| CN112210788B (en) * | 2020-10-15 | 2022-04-08 | 吕子红 | Method and equipment for decomposing chlorate in light salt water for producing chlor-alkali |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2290611Y (en) * | 1996-12-27 | 1998-09-09 | 西安交通大学 | Electrolytic alkali liquid energy saving evaporation appts. by diaphragm process |
| DE102007005541A1 (en) * | 2007-02-03 | 2008-08-07 | Bayer Materialscience Ag | Process for the electrochemical dechlorination of anolyte sols from NaCl electrolysis |
| CN101671832B (en) * | 2009-10-14 | 2011-08-03 | 山东东岳氟硅材料有限公司 | Method for improving brine processing capability of brine preprocessor |
| CN102285641B (en) * | 2010-06-21 | 2013-07-10 | 南通星球石墨设备有限公司 | Recycling process of waste hydrochloric acid |
| CN102198952B (en) * | 2011-03-27 | 2016-06-22 | 崔怀奇 | A kind of combined soda method systemic circulation technique |
| JP2014014743A (en) * | 2012-07-06 | 2014-01-30 | Hitachi Ltd | Method and apparatus for treating salt waste water |
| CN103849886A (en) * | 2012-11-30 | 2014-06-11 | 湖北宜化化工股份有限公司 | Caustic soda electrolytic cell cooled by utilizing pure water heat exchange |
| CN104532283B (en) * | 2014-12-17 | 2016-01-13 | 济宁金威煤电有限公司 | A kind of light salt brine replaces method and the device of part refined brine electrolysis caustic soda |
| CN204714913U (en) * | 2015-05-26 | 2015-10-21 | 南通星球石墨设备有限公司 | A kind of light salt brine pretreatment unit |
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Address after: 226500 Jiangsu province Nantong City Jiuhua town Rugao City Huaxing Road No. 8 Patentee after: Nantong star graphite Co., Ltd Address before: 226500 Jiangsu province Nantong City Jiuhua Jiuhua town of Rugao City neighborhood Patentee before: Nantong Xingqiu Graphite Facilities Company |