CN103819041B - A kind of method of cryoconcentration high-salt wastewater - Google Patents
A kind of method of cryoconcentration high-salt wastewater Download PDFInfo
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- CN103819041B CN103819041B CN201410099755.1A CN201410099755A CN103819041B CN 103819041 B CN103819041 B CN 103819041B CN 201410099755 A CN201410099755 A CN 201410099755A CN 103819041 B CN103819041 B CN 103819041B
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Abstract
The invention discloses a kind of method of cryoconcentration high-salt wastewater, its innovative point is: comprise charging, an effect evaporation, two effect heat exchange, two effect evaporation and separating steps, especially one effect evaporation step in adopt in steam mechanical recompression evaporator carry out low-temperature evaporation concentrate, concentrated effect is good.The method of this cryoconcentration high-salt wastewater of the present invention, reduce the vaporization temperature of high-salt wastewater, energy-conserving and environment-protective, the energy consumption of evaporation 1 ton of water is approximately 1/8 to 1/7 of conventional evaporator, has been completely free of the dependence to steam boiler, MVR mainly consumes electric energy after starting to consume steam, save energy, reduces costs, and level of automation is high, fully automatic working flow process, without the need to manual monitoring.
Description
Technical field
The present invention relates to a kind of method of concentrated high-salt wastewater, particularly relate to a kind of method of cryoconcentration high-salt wastewater, belong to energy-conservation manufacture field.
Background technology
The English abbreviation of mechanical steam recompression vaporizer is MVR vaporizer, to the waste hot steam produced in evaporative process by countercurrent washing and mechanical recompression, improves degree of cleaning and the heat content of waste hot steam, re-uses, reach object that is energy-conservation and environmental protection.
MVR cryogenic vaporizer is current most advanced vaporizer technology in the world, and its feature is as follows:
1) do not have waste hot steam to discharge, energy-saving effect is very remarkable, is equivalent to 10 single-effect evaporators.
2) use the countercurrent washing that this technology can realize secondary steam, therefore water of condensation dry matter content is far below multinomial vaporizer.
3) adopt low-temperature negative-pressure evaporation (50-90 DEG C), be conducive to preventing from being evaporated the high-temperature denatured of material.
4) MVR vaporizer is the regeneration product of traditional multiple-effect falling film vaporizer, is by re-using secondary steam countercurrent washing and recompression on the basis of single-effect evaporator.The material that all single-action and multiple-effect evaporator are suitable for, is all applicable to adopting MVR vaporizer, has complete substitutability technically, and have more excellent environmental protection and energy conservation characteristic.
Start the seventies to develop rapidly abroad, now widely use, be applied to a lot of production field such as Industrial Wastewater Treatment and ammonium sulfate sodium sulfate, sodium-chlor, sea water desaltination, coking plant (reclaiming sulfur dioxide to produce sulfuric acid ammonium).Without the need to using raw steam in evaporative process, will reduce running cost greatly, realize its working process of energy-saving and emission-reduction is that low-grade steam is after compressor compression simultaneously, temperature, pressure improves, enthalpy increases, and then enters interchanger condensation, to make full use of the latent heat of steam.Except startup, without the need to raw steam in whole evaporative process.
In Multi-effect Evaporation Processes, the secondary steam of the most aftereffect of vaporizer can not directly as effective thermal source, can only as the thermal source of secondary effect or secondary a few effect.As additionally its energy must be given as this effect thermal source, its temperature (pressure) is improved.Vapor jet pump can only compression section secondary steam, the secondary steam that mvr vaporizer is then all in recoverable vaporizer.
Research finds, being concentrated in the process of high-salt wastewater by energy-conservation for MVR evaporation Technology application, is an effective method, and energy-conserving and environment-protective, and purification thickening efficiency is high.
Summary of the invention
The object of this invention is to provide a kind of method of cryoconcentration high-salt wastewater, to solve the still unsolved difficult problem of above-mentioned prior art.
The technical solution used in the present invention is: a kind of method of cryoconcentration high-salt wastewater, is characterized in that: comprise the following steps:
(1) charging: be 25 DEG C by temperature, initial salt concn be 14 ~ 30% high-salt wastewater pass into an effect interchanger and preheat, arranging an effect heat exchange temperature is 70 ~ 72 DEG C;
(2) one effect evaporations: the high-salt wastewater after preheating is passed in an effect steam mechanical recompression evaporator and carry out evaporation concentration, arranging vaporization temperature is 100 ~ 102 DEG C, evaporating pressure is 0.5 ~ 0.6MPa, when one effect evaporation after high-salt wastewater salt concn lower than 26% time, by one effect recycle pump repeat one effect evaporation; When the salt concn of the high-salt wastewater after an effect evaporation reaches 26 ~ 28%, carry out two effect heat exchange;
(3) two effect heat exchange: the high-salt wastewater after an effect evaporation is passed into two effect interchanger heating, and arranging two effect heat exchange temperatures is 72 ~ 75 DEG C;
(4) two effect evaporations: passed in two effect crystallization formula vaporizers by the high-salt wastewater of two effect heating and carry out evaporative crystallization, arranging vaporization temperature is 102 ~ 105 DEG C, and evaporating pressure is 0.6 ~ 0.8MPa;
(5) be separated: the high-salt wastewater after two effect evaporations is adopted salt pump through two effects and entered suspension separator, supernatant liquid again returns to two effect crystallization formula vaporizers and carries out double evaporation-cooling, lower floor's salt slurry delivers to salt slurry header tank, again the salt slurry in salt slurry header tank is delivered to whizzer and carry out centrifugal treating, be centrifugally mother liquid obtainedly pumped back to two effect interchanger by mother liquor and carry out second-heating.
Further, being pumped back to salt concn in the mother liquor of two effect interchanger by mother liquor in described step 5 is 95%.
Further, in described step 1, initial salt concn is 20%.
Further, the salt concn of the high-salt wastewater in described step 2 after an effect evaporation is 27%.
Further, in described step 3, two effect heat exchange temperatures are 73 DEG C.
Beneficial effect: the method for this cryoconcentration high-salt wastewater of the present invention, reduce the vaporization temperature of high-salt wastewater, energy-conserving and environment-protective, the energy consumption of evaporation 1 ton of water is approximately 1/8 to 1/7 of conventional evaporator, has been completely free of the dependence to steam boiler, MVR mainly consumes electric energy after starting to consume steam, save energy, reduces costs, and level of automation is high, fully automatic working flow process, without the need to manual monitoring.
Embodiment
Implementation column below can make those skilled in the art more fully understand the present invention, but does not therefore limit the present invention among described scope of embodiments.
embodiment 1
(1) charging: be 25 DEG C by temperature, initial salt concn be 14% high-salt wastewater pass into an effect interchanger and preheat, arranging an effect heat exchange temperature is 70 DEG C;
(2) one effect evaporations: passed into by the high-salt wastewater after preheating in an effect steam mechanical recompression evaporator and carry out evaporation concentration, arranging vaporization temperature is 100 DEG C, and evaporating pressure is 0.5MPa; The salt concn of the high-salt wastewater after one effect evaporation reaches 26%, carries out two effect heat exchange;
(3) two effect heat exchange: the high-salt wastewater after an effect evaporation is passed into two effect interchanger heating, and arranging two effect heat exchange temperatures is 72 DEG C;
(4) two effect evaporations: passed in two effect crystallization formula vaporizers by the high-salt wastewater of two effect heating and carry out evaporative crystallization, arranging vaporization temperature is 102 DEG C, and evaporating pressure is 0.6MPa;
(5) be separated: the high-salt wastewater after two effect evaporations is adopted salt pump through two effects and entered suspension separator, supernatant liquid again returns to two effect crystallization formula vaporizers and carries out double evaporation-cooling, lower floor's salt slurry delivers to salt slurry header tank, again the salt slurry in salt slurry header tank is delivered to whizzer and carry out centrifugal treating, be centrifugally mother liquid obtainedly pumped back to two effect interchanger by mother liquor and carry out second-heating.
By the working method of the present embodiment, the salt-pepper noise purity of gained is 99.6%.
embodiment 2
Be the high-salt wastewater of 20% by salt concn, carry out cryoconcentration according to the treatment process described in embodiment, the salt-pepper noise purity of gained is 99.7%.
embodiment 3
Be the high-salt wastewater of 30% by salt concn, carry out cryoconcentration according to the treatment process described in embodiment, the salt-pepper noise purity of gained is 99.8%.
Claims (5)
1. a method for cryoconcentration high-salt wastewater, is characterized in that: comprise the following steps:
(1) charging: be 25 DEG C by temperature, initial salt concn be 14 ~ 20% high-salt wastewater pass into an effect interchanger and preheat, arranging an effect heat exchange temperature is 70 ~ 72 DEG C;
(2) one effect evaporations: the high-salt wastewater after preheating is passed in an effect steam mechanical recompression evaporator and carry out evaporation concentration, arranging vaporization temperature is 100 ~ 102 DEG C, evaporating pressure is 0.5 ~ 0.6MPa, when one effect evaporation after high-salt wastewater salt concn lower than 26% time, by one effect recycle pump repeat one effect evaporation; When the salt concn of the high-salt wastewater after an effect evaporation reaches 26 ~ 28%, carry out two effect heat exchange;
(3) two effect heat exchange: the high-salt wastewater after an effect evaporation is passed into two effect interchanger heating, and arranging two effect heat exchange temperatures is 72 ~ 75 DEG C;
(4) two effect evaporations: passed in two effect crystallization formula vaporizers by the high-salt wastewater of two effect heat exchange and carry out evaporative crystallization, arranging vaporization temperature is 102 ~ 105 DEG C, and evaporating pressure is 0.6 ~ 0.8MPa;
(5) be separated: the high-salt wastewater after two effect evaporations is adopted salt pump through two effects and entered suspension separator, supernatant liquid again returns to two effect crystallization formula vaporizers and carries out double evaporation-cooling, lower floor's salt slurry delivers to salt slurry header tank, again the salt slurry in salt slurry header tank is delivered to whizzer and carry out centrifugal treating, be centrifugally mother liquid obtainedly pumped back to two effect interchanger by mother liquor and carry out second-heating.
2. the method for cryoconcentration high-salt wastewater according to claim 1, is characterized in that: being pumped back to salt concn in the mother liquor of two effect interchanger in described step 5 by mother liquor is 95%.
3. the method for cryoconcentration high-salt wastewater according to claim 1, is characterized in that: in described step 1, initial salt concn is 20%.
4. the method for cryoconcentration high-salt wastewater according to claim 1, is characterized in that: the salt concn of the high-salt wastewater in described step 2 after an effect evaporation is 27%.
5. the method for cryoconcentration high-salt wastewater according to claim 1, is characterized in that: in described step 3, two effect heat exchange temperatures are 73 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105712843A (en) * | 2014-12-05 | 2016-06-29 | 南通赛孚机械设备有限公司 | Glycerin MVR evaporation and concentration technology |
| CN104591464B (en) * | 2015-02-03 | 2016-05-25 | 石家庄工大化工设备有限公司 | A kind of recovery and treatment method of high-salt wastewater |
| CN104986907A (en) * | 2015-06-06 | 2015-10-21 | 秦健 | Method for low-temperature concentration of high-salinity wastewater |
| CN105236651A (en) * | 2015-10-03 | 2016-01-13 | 中国轻工业长沙工程有限公司 | Technology for evaporating and crystallizing high concentration salt-containing wastewater in pulping and papermaking industries |
| CN105152249B (en) * | 2015-10-03 | 2017-04-26 | 中国轻工业长沙工程有限公司 | Evaporative crystallization technology for metallurgy high-concentration salt-containing wastewater |
| CN105417819B (en) * | 2015-11-27 | 2018-10-12 | 内蒙古包钢和发稀土有限公司 | A kind of technique of efficient process rare earth sulfuric acid ammonium waste water |
| CN105797411A (en) * | 2016-05-27 | 2016-07-27 | 苏州乔发环保科技股份有限公司 | MVR (mechanical vapor recompression) circulating vaporization system and concentrating, vaporizing and crystallizing process of desulfurization wastewater |
| CN107365013B (en) * | 2017-06-14 | 2021-01-29 | 广东益诺欧环保股份有限公司 | Cyanide-containing wastewater treatment method, treatment system and application |
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| US3912578A (en) * | 1973-01-22 | 1975-10-14 | United States Steel Corp | Apparatus for and a method of purifying waste fluid |
| US7832714B2 (en) * | 2007-01-19 | 2010-11-16 | Heartland Technology Partners Llc | Desalination system |
| KR100992428B1 (en) * | 2009-08-17 | 2010-11-08 | 주식회사 파나블루 | Method of mineral water manufacture through efficient mineral control and removal of anion by nf membrane |
| CN102070272A (en) * | 2010-12-07 | 2011-05-25 | 华电水处理技术工程有限公司 | Wastewater evaporation concentration process and device system |
| CN102390902A (en) * | 2011-09-28 | 2012-03-28 | 江苏金山环保科技有限公司 | Treating system for recycling and drying concentrated water with high salt content |
| CN103588338B (en) * | 2013-11-06 | 2015-01-14 | 江苏赛格尔环保工程有限公司 | High-concentration organic salt-containing wastewater treatment method adopting steam recompression technology |
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