CN101982213B - Technology of concentrating saline water and heat pump device thereof - Google Patents

Technology of concentrating saline water and heat pump device thereof Download PDF

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Publication number
CN101982213B
CN101982213B CN2010105251629A CN201010525162A CN101982213B CN 101982213 B CN101982213 B CN 101982213B CN 2010105251629 A CN2010105251629 A CN 2010105251629A CN 201010525162 A CN201010525162 A CN 201010525162A CN 101982213 B CN101982213 B CN 101982213B
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evaporimeter
brine
pump
evaporator
heat pump
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CN101982213A (en
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翁关云
周光明
洪厚军
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Jiangsu Ruineng Anticorrosion Equipment Co ltd
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JIANGSU RUIPU ANTICORROSION EQUIPMENT CO Ltd
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Abstract

The invention relates to a technology of concentrating saline water and a heat pump device thereof. The technology comprises the following steps: (1) feeding thin saline water obtained by electrolysis into an evaporator to carry out evaporation concentration; (2) compressing secondary vapors output by the evaporator and then delivering the compressed secondary vapors to the heating chamber of the evaporator to be used for heating, and condensating the vapors into water; and (3) delivering the thick saline water the concentration of which is 300-315g/l obtained in the step (1) to the subsequent process; using a vacuum pump to regulate the pressure in the evaporator so as to reduce boiling point of the water. The heat pump device comprises a thin saline water tank, a pump, an evaporator, a separator and a compressor, wherein the thin saline water tank is connected with the evaporator by the pump; the vapor outlet of the evaporator is connected with the separator, the compressor and the heating chamber of the evaporator in sequence by pipelines; and the discharge hole of the evaporator is connected with a thick saline water pump and the pipelines. In the invention, the technology has short flows, and the device has advantages of compact structure and small occupied area; and 25-50kWh of electric energy is consumed for evaporating a ton of water, thus saving energy by 50-70%.

Description

A kind of technology of concentrated salt solution and heat pump assembly thereof
Technical field
The present invention relates to chemical process and equipment technology field, especially a kind of concentrated salt solution technology in chemical industry for making chlorine and alkali field and the heat pump assembly that is used for this technology.
Background technology
At present, the concentrated salt solution technology in chemical industry for making chlorine and alkali field generally is such, the weak brine (concentration of NaCl is 200g/l approximately) that electrowinning process is returned; Again return the primary brine operation; Replenish the part industry water again, add solid salt after the Hybrid Heating, brine strength is risen to 300-315g/l; Remove the quality standard that reaches electrolysis behind the impurity and require (light salt brine amount account for primary brine flow 75%) through adding excessive finishing agent, get into electrowinning process again and produce caustic soda and chlorine.This process portion light salt brine makes the flow design of brine system increase 75%, has wasted the energy consumption and the finishing agent consumption of primary brine, and equipment investment cost increases, and floor space increases.And; For the enterprise of perhalogeno system alkali, the light salt brine that electrolysis is returned can't replenish solid salt, can only weak brine be returned bittern enterprise; Or adopt multi-effect evaporating device that this part salt solution is reclaimed; One ton of water of every evaporation need consume steam 0.8-1.3 ton, and energy consumption is high, has increased the production cost of enterprise.
Summary of the invention
To the above existing deficiency that concentrates salt solution technology and equipment; The purpose of this invention is to provide a kind of salt solution new technology that concentrates and the heat pump assembly that is used for this technology; Through concentrating to salt solution; To reach the desired brine strength of subsequent handling, make light salt brine after the electrolysis directly return electrowinning process and recycle, thereby reduce the investment and the operating cost of primary brine.
The objective of the invention is through adopting following technical scheme to realize:
A kind of technology of concentrated salt solution may further comprise the steps:
The concentration 180-315g/l that (1) will obtain from electrolysis, temperature 40-90 ℃ weak brine directly delivers into evaporimeter, and in said evaporimeter evaporation and concentration, to reach the needed brine strength of electrowinning process (300-315g/l);
(2) will be from the indirect steam of said evaporimeter output; Through compressor compresses; Compression ratio maintains 1:1.2 to 1:2.5, and pressure, temperature rising, the heat content of steam are increased, and delivers to the heating clamber of said evaporimeter then and is used as the heating steam use; Make feed liquid keep fluidized state, and make heating steam itself be condensed into water;
(3) strong brine that gained concentration in the step (1) is reached 300-315g/l through the strong brine pumping toward follow-up operation.
As optimal technical scheme of the present invention, said step is regulated the pressure in the said evaporimeter through vavuum pump in (2), the boiling point of water is reduced, thereby the salt solution in the step of making (1) need not heating and directly explosive evaporation.
As optimal technical scheme of the present invention, the temperature range of the direct explosive evaporation of salt solution is controlled at 40-90 ℃ in the said step (1).
As optimal technical scheme of the present invention, the part strong brine of step (3) gained returned deliver into said evaporimeter, to regulate inlet amount.
As optimal technical scheme of the present invention, the condensed water that produces in the said step (2) is sent to primary brine through condensate pump and does the use of dissolved solid salt, to reduce the heating energy consumption of primary brine operation.
As optimal technical scheme of the present invention, the design discharge scope of said technology is controlled at 20%-110%.
A kind of heat pump assembly that is used for concentrating salt solution; Comprise weak brine groove, weak brine pump, evaporimeter, separator, compressor, strong brine pump; Said weak brine groove is connected with the charging aperture of evaporimeter through weak brine pump and pipeline; The steam (vapor) outlet of said evaporimeter is connected with the heating clamber of separator, compressor and evaporimeter through pipeline successively, and the discharging opening of said evaporimeter is connected with strong brine pump and pipeline.
As optimal technical scheme of the present invention, said heat pump assembly also comprises circulating pump, and the discharging opening of said evaporimeter is connected with the charging aperture of evaporimeter through circulating pump and pipeline.
As optimal technical scheme of the present invention, said heat pump assembly also comprises vavuum pump, and said vavuum pump is connected with the material chamber of said evaporimeter through pipeline.
As optimal technical scheme of the present invention, said heat pump assembly also comprises condensate pump, and said condensate pump is connected with the condensation-water drain of said evaporimeter through pipeline;
The material of said weak brine groove comprises low calcium and magnesium fiberglass or lining fluorine material, and the material of said evaporimeter comprises titanium, and the main material of said other part of heat pump assembly comprises titanium or 316L stainless steel.
The invention has the beneficial effects as follows: with respect to prior art; Technological process of the present invention is shorter; Its apparatus structure is compact, floor space is little, requisite space is also less; Need not circulating water cooling system, one ton of water of every evaporation only needs consumed power 25-50kwh, than adopting multiple-effect evaporation to concentrate the energy-conservation 50-70% of salt solution.
The present invention can reduce chemical industry for making chlorine and alkali industry primary brine operation treating capacity 70-75%, reduces equipment investment 50%-65%, and finishing agent consumption reduces 60-75%, and the primary brine process energy consumption reduces 60-70%.The present invention can reduce investment outlay, and can obtain energy-saving effect preferably again.
Description of drawings
Fig. 1 is a process flow diagram of the present invention;
Fig. 2 is the structural representation of apparatus of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further:
As depicted in figs. 1 and 2; A kind of technology of concentrated salt solution; May further comprise the steps: (1) is with the concentration 180-315g/l that obtains from electrolysis in the weak brine groove 1, temperature 40-90 ℃ weak brine; Directly deliver into plate-type down-film evaporator 3 through weak brine pump 2, and in said falling film evaporator 3 evaporation and concentration, to reach the needed brine strength of electrowinning process (300-315g/l);
(2) will behind separator 4, obtain indirect steam from the mixed vapour of said evaporimeter 3 outputs; Indirect steam is compressed with vapour compression machine 5; Compression ratio maintains 1:1.2 to 1:2.5, and pressure, temperature rising, the heat content of steam are increased, and delivers to the heating clamber of falling film evaporator 3 then and is used as the heating steam use; Make the feed liquid in the evaporimeter 3 keep fluidized state, and make heating steam itself be condensed into water;
(3) the qualified strong brine that the middle gained concentration of step (1) is reached 300-315g/l is sent to subsequent handling through strong brine pump 6.
As the present invention's embodiment preferably, in the said step of above embodiment (2), regulate the pressure in the said evaporimeter 3 through vavuum pump 9, the boiling point of water is reduced, thereby the salt solution in the step of making (1) need not heating and directly explosive evaporation; The temperature range of the direct explosive evaporation of salt solution is controlled at 40-90 ℃ in the said step (1).The part strong brine of step (3) gained returned through circulating pump 7 deliver into said evaporimeter 3, to regulate inlet amount.The condensed water that produces in the said step (2) is sent to primary brine through condensate pump 8 and does the use of dissolved solid salt, to reduce the heating energy consumption of primary brine operation.The design discharge scope of technology according to the invention is controlled at 20%-110%.
As shown in Figure 2; A kind of heat pump assembly that is used for concentrating salt solution; Comprise weak brine groove 1, weak brine pump 2, evaporimeter 3, separator 4, compressor 5 and strong brine pump 6; Said weak brine groove 1 is connected with the charging aperture of evaporimeter 3 through weak brine pump 2 and pipeline, and the steam (vapor) outlet of said evaporimeter 3 is connected with separator 4, compressor 5 and the heating clamber of evaporimeter 3 through pipeline successively, and the discharging opening of evaporimeter 3 is connected with strong brine pump 6 and pipeline.In the present embodiment, said evaporimeter 3 is plate-type down-film evaporators, and the material of evaporimeter 3 is titaniums, and the material of said weak brine groove 1 is low calcium and magnesium fiberglass or lining fluorine material.
As embodiment preferably; Heat pump assembly according to the invention also comprises circulating pump 7; The discharging opening of said evaporimeter 3 is connected with the charging aperture of evaporimeter 3 through circulating pump 7 and pipeline; It is indoor that thereby the part strong brine that will evaporate the back gained returns the material that delivers into evaporimeter 3 through circulating pump 7, to regulate inlet amount.Heat pump assembly also comprises vavuum pump 9; Vavuum pump 9 is connected with the material chamber of evaporimeter 3 through pipeline, and vavuum pump 9 is used to regulate the pressure in the evaporimeter 3, and the boiling point of the indoor water of its material is reduced; Thereby make the indoor salt solution of evaporimeter 3 material need not heating and directly explosive evaporation, to save energy consumption.Heat pump assembly also comprises condensate pump 8, and condensate pump 8 is connected with the condensation-water drain of evaporimeter 3 through pipeline, and condensed water is sent to primary brine through condensate pump 8 and does the use of dissolved solid salt, thereby reduces the heating energy consumption of primary brine operation.The material of heat pump assembly chief component of the present invention comprises titanium or 316L stainless steel.

Claims (5)

1. the technology of a concentrated salt solution is characterized in that may further comprise the steps:
The concentration 180-315g/l that (1) will obtain from electrolysis, temperature 40-90 ℃ weak brine directly delivers into evaporimeter, and in said evaporimeter evaporation and concentration, to reach the needed brine strength 300-315g/l of electrowinning process; The temperature range of the direct explosive evaporation of salt solution is controlled at 40-90 ℃ in this step;
(2) will be from the indirect steam of said evaporimeter output; Through compressor compresses; Compression ratio maintains 1: 1.2 to 1: 2.5, and pressure, temperature rising, the heat content of steam are increased, and delivers to the heating clamber of said evaporimeter then and is used as the heating steam use; Make feed liquid keep fluidized state, and make heating steam itself be condensed into water;
Regulate the pressure in the said evaporimeter through vavuum pump in this step, the boiling point of water is reduced, thereby the salt solution in the step of making (1) need not heating and directly explosive evaporation;
(3) strong brine that gained concentration in the step (1) is reached 300-315g/l through the strong brine pumping toward follow-up operation; Comprising being returned, the part strong brine delivers into said evaporimeter, to regulate inlet amount.
2. the technology of concentrated salt solution according to claim 1 is characterized in that: the condensed water that produces in the said step (2) is sent to primary brine through condensate pump and makes dissolved solid salt and use, to reduce the heating energy consumption of primary brine operation.
3. the technology of concentrated salt solution according to claim 1, it is characterized in that: the design discharge scope of said technology is controlled at 20%-110%.
4. heat pump assembly that is used for concentrating salt solution; It is characterized in that: said heat pump assembly comprises weak brine groove, weak brine pump, evaporimeter, separator, compressor, strong brine pump; Said weak brine groove is connected with the charging aperture of evaporimeter through weak brine pump and pipeline; The steam (vapor) outlet of said evaporimeter is connected with the heating clamber of separator, compressor and evaporimeter through pipeline successively, and the discharging opening of said evaporimeter is connected with strong brine pump and pipeline;
Said heat pump assembly comprises circulating pump, and the discharging opening of said evaporimeter is connected with the charging aperture of evaporimeter through circulating pump and pipeline;
Said heat pump assembly also comprises condensate pump, and said condensate pump is connected with the condensation-water drain of said evaporimeter through pipeline;
The material of said weak brine groove comprises low calcium and magnesium fiberglass or lining fluorine material, and the material of said evaporimeter comprises titanium, and the main material of said other part of heat pump assembly comprises titanium or 316L stainless steel.
5. the heat pump assembly that is used for concentrating salt solution according to claim 4, it is characterized in that: said heat pump assembly also comprises vavuum pump, said vavuum pump is connected with the material chamber of said evaporimeter through pipeline.
CN2010105251629A 2010-10-29 2010-10-29 Technology of concentrating saline water and heat pump device thereof Active CN101982213B (en)

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NL2006776C2 (en) * 2011-05-13 2012-11-14 Friesland Brands Bv Evaporator system.
CN102553274A (en) * 2012-03-11 2012-07-11 甘肃蓝科石化高新装备股份有限公司 Tubular evaporator device with mechanical steam compressor
CN104944484A (en) * 2015-06-03 2015-09-30 营创三征(营口)精细化工有限公司 Weak brine concentration plant and concentration technology
CN105126365A (en) * 2015-08-17 2015-12-09 浙江森力机械科技股份有限公司 Two-stage combined mechanical steam recompression concentrator
CN108905241A (en) * 2018-06-29 2018-11-30 江苏海容热能环境工程有限公司 A kind of brine concentration and concentration regulator

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US6436242B1 (en) * 2000-02-10 2002-08-20 Pedro Joaquin Sanchez Belmar Device and method for distilling water
CN1182900C (en) * 2002-11-14 2005-01-05 华东理工大学 Technique of combined concentration by evaporation with heat pump being provided
CN201862279U (en) * 2010-10-29 2011-06-15 江苏瑞普膜技术有限公司 Heat pump device for brine concentration

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