CN212269520U - High-salinity wastewater system utilizing photo-thermal evaporation crystallization - Google Patents
High-salinity wastewater system utilizing photo-thermal evaporation crystallization Download PDFInfo
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- CN212269520U CN212269520U CN202021114811.1U CN202021114811U CN212269520U CN 212269520 U CN212269520 U CN 212269520U CN 202021114811 U CN202021114811 U CN 202021114811U CN 212269520 U CN212269520 U CN 212269520U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/208—Off-grid powered water treatment
- Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The utility model discloses a system for high-salt waste water utilizing photothermal evaporation crystallization, which comprises a high-salt waste water conveying device, wherein the high-salt waste water conveying device is connected with a dilatation evaporation device which is connected with an evaporation crystallization device; the high-salinity wastewater conveying device is provided with a preheated water input end and a preheated water output end; the trough parabolic light and heat collecting unit is connected with the expansion evaporation device and the evaporation crystallization device in sequence through a heat conducting oil circulating pipeline and is connected back to the trough parabolic light and heat collecting unit; the groove type paraboloid light and heat gathering unit is also connected with the molten salt heat storage unit. The utility model discloses handle high salt waste water and rely on the light and heat system to provide the heat source, the heat source mainly comes from solar energy, accords with green's sustainable development theory.
Description
Technical Field
The utility model relates to a water treatment field, especially a processing system of high salt waste water.
Background
China issued action plans for preventing and treating water pollution (ten water items) in 2015, which marks that the state puts higher requirements on the treatment of water pollution. With the increasing restriction of the use of water resources by various industrial plans, the direct discharge of wastewater is prohibited in many areas, and the zero discharge and the recycling of wastewater become a new normal state. The high-salinity wastewater has the characteristics of high corrosivity, serious harm to the environment, complex treatment process, high treatment energy consumption and the like. Therefore, the treatment of high salinity wastewater has been a problem.
For example, utility model patent (patent publication No. CN 209835696U) reports a system for treating desulfurization waste water of coal-fired power plant by using solar photo-thermal technology. It is known that desulfurized waste water belongs to high-salinity waste water. The system comprises an annular Fresnel solar condenser, a molten salt heat exchanger, a dilatation evaporator, a jet concentrator and the like. The system can realize the crystallization and solidification of the desulfurization wastewater, but the system is based on a coal-fired power plant and heats the desulfurization wastewater by using the waste heat of the flue. The system cannot operate if it is disconnected from the coal fired power plant.
A solar energy hot water cogeneration process is reported in the utility model patent (patent publication No. CN 110332086A). The system comprises a condenser, a heat collecting tower, a heat medium storage tank, a steam generator, a cold medium storage tank, a seawater/brackish water desalination system, a turbine generator, a booster transformer, desalinated water storage and the like. It is well known that seawater is a high salt water. And all the low-temperature waste heat steam after power generation enters a seawater/brackish water desalination system, the low-temperature waste heat steam is used as a heat source of a low-temperature multi-effect evaporation system to be fully utilized for desalinating seawater or brackish water again, distilled water produced by the desalination system enters a desalinated water storage tank, one part of the distilled water is used as production water of a photo-thermal power plant and is conveyed to a turbine generator of a power generation system, and the other part of the distilled water is used as urban residents and other industrial water. The seawater/brackish water desalination system adopts all low-temperature waste heat steam after power generation as a heat source, the grade of the waste heat steam is low, and the requirement cannot be met if the seawater/brackish water desalination system is used for treating high-salinity wastewater.
SUMMERY OF THE UTILITY MODEL
The main object of the utility model is to provide an utilize system of light and heat evaporation crystallization processing high salt waste water.
The technical means adopted by the utility model are as follows.
A system for high-salinity wastewater evaporation crystallization by utilizing photo-thermal energy comprises a high-salinity wastewater conveying device, wherein the high-salinity wastewater conveying device is connected with a capacity expansion evaporation device, and the capacity expansion evaporation device is connected with an evaporation crystallization device; the high-salinity wastewater conveying device is provided with a preheated water input end and a preheated water output end; the trough parabolic light and heat collecting unit is connected with the expansion evaporation device and the evaporation crystallization device in sequence through a heat conducting oil circulating pipeline and is connected back to the trough parabolic light and heat collecting unit; the groove type paraboloid light and heat gathering unit is also connected with the molten salt heat storage unit.
The expansion evaporation device and the evaporation crystallization device are provided with steam output ends, the steam output ends are connected with the preheated water input ends of the high-salinity wastewater conveying devices, and the preheated water output ends are connected with the distilled water collecting unit.
Conveying the high-salinity wastewater to an expansion evaporation device through a high-salinity wastewater conveying device, and concentrating and reducing the high-salinity wastewater; then sending the salt into an evaporative crystallization device to finish crystallization and solidification of the salt, and obtaining crystallized salt; the expansion evaporation device and the evaporation crystallization device simultaneously generate steam to obtain distilled water; the groove type paraboloid light-gathering and heat-collecting unit absorbs sunlight heat, the heat is sequentially conveyed to the expansion evaporation device and the evaporation crystallization device through the heat conduction oil circulation pipeline to provide heat for the expansion evaporation device and the evaporation crystallization device, and redundant heat is stored through the molten salt heat storage unit and is released when no solar energy exists, so that the continuous operation of the whole system is ensured.
Steam generated by the capacity-expanding evaporation device and the evaporation crystallization device is used for preheating the high-salinity wastewater, and the preheated steam is changed into distilled water for recycling; the temperature range of the steam is 50-80 ℃, and the pressure range of the steam is 0.07-0.09 MPa.
The salt content of the high-salt wastewater entering the evaporative crystallization device is more than 10000mg/L, the COD of the high-salt wastewater is less than 100mg/L, and the content of suspended matters in the high-salt wastewater is less than 100 mg/L.
The heat conducting oil is heated to 400-plus-500 ℃ by the groove-type paraboloid light-gathering heat-collecting unit, and the temperature is reduced to 100-plus-200 ℃ after heat exchange by the expansion evaporation device and the evaporation crystallization device.
The steam-water ratio of the expansion evaporation system is 1:3-1: 5.
The water making ratio of the evaporative crystallization device is more than 10.
The utility model has the advantages that: the high-salinity wastewater treatment system provides a heat source by means of a photo-thermal system, the heat source mainly comes from solar energy, and the sustainable development concept of green and environmental protection is met. No additional consumption of chemicals and no environmental pollution. The product is crystallized salt and distilled water, and both products can be sold, so that high additional value is brought.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Detailed Description
Referring to fig. 1, the system for high-salinity wastewater evaporation crystallization by using photo-thermal energy of the present invention includes a high-salinity wastewater delivery device 1, the high-salinity wastewater delivery device 1 is connected to a volume-expansion evaporation device 2, and the volume-expansion evaporation device 2 is connected to an evaporation crystallization device 3; the high-salinity wastewater conveying device 1 is provided with a preheated water input end 11 and a preheated water output end 12; the trough parabolic light and heat collecting unit 4 is also arranged, and the trough parabolic light and heat collecting unit 4 is sequentially connected with the expansion evaporation device 2 and the evaporation crystallization device 3 through a heat conducting oil circulating pipeline 5 and is connected back to the trough parabolic light and heat collecting unit 4; the trough type paraboloid light and heat gathering unit 4 is also connected with a molten salt heat storage unit 6. The trough type paraboloid light and heat gathering unit, the heat conducting oil circulation pipeline and the molten salt heat storage unit form a light and heat system. The expansion evaporation device and the evaporation crystallization device are both existing mature equipment, the expansion evaporation device aims at concentrating and reducing the high-salinity wastewater, and the evaporation crystallization device is preferably a multi-stage flash evaporation device and aims at realizing the final separation of salt and water in the high-salinity wastewater and finishing the crystallization and solidification of salt.
In order to save energy and efficiently utilize resources, the high-salinity wastewater is preheated by the steam generated by the expansion evaporation device and the steam generated by the evaporation crystallization device.
The expansion evaporation device 2 and the evaporation crystallization device 3 are provided with a steam output end 7, the steam output end 7 is connected with a preheated water input end 11 of the high-salinity wastewater conveying device 1, and a preheated water output end 12 is connected with a distilled water collecting unit 8.
A return pipeline 21 can be further arranged between the expansion evaporation device 2 and the evaporation crystallization device 3 to be connected between the high-salt wastewater input device 1 and the expansion evaporation device 2, so that the high-salt wastewater which does not meet the evaporation crystallization requirement is refluxed and reprocessed.
The utility model discloses the relevant equipment that uses all is current ripe equipment.
The utility model also provides a method for utilizing the photo-thermal evaporation crystallization of the high-salinity wastewater, which is to convey the high-salinity wastewater to the expansion evaporation device through the high-salinity wastewater conveying device to concentrate and reduce the high-salinity wastewater; then sending the salt into an evaporative crystallization device to finish crystallization and solidification of the salt, and obtaining crystallized salt; the expansion evaporation device and the evaporation crystallization device simultaneously generate steam to obtain distilled water; the groove type paraboloid light-gathering and heat-collecting unit absorbs sunlight heat, the heat is sequentially conveyed to the expansion evaporation device and the evaporation crystallization device through the heat conduction oil circulation pipeline to provide heat for the expansion evaporation device and the evaporation crystallization device, and redundant heat is stored through the molten salt heat storage unit and is released when no solar energy exists, so that the continuous operation of the whole system is ensured. The expansion evaporation device and the evaporation crystallization device are both existing mature equipment, the expansion evaporation device aims at concentrating and reducing the high-salinity wastewater, and the evaporation crystallization device is preferably a multi-stage flash evaporation device and aims at realizing the final separation of salt and water in the high-salinity wastewater and finishing the crystallization and solidification of salt.
The steam that dilatation evaporation plant and evaporation crystallization device produced is used for preheating high salt waste water, and high salt waste water is preheating and need absorbing certain heat, if absorbed the waste heat of steam, then just can absorb some solar photo-thermal system's heat less, then solar photo-thermal system's construction scale just can be a little. The preheated steam is changed into distilled water for recovery, the temperature range of the steam is 50-80 ℃, and the pressure range of the steam is 0.07-0.09 MPa. The salt content of the distilled water is less than 10 mg/L, and may be, for example, 9 mg/L, 8 mg/L, 7mg/L, etc., preferably 5 mg/L.
The salt-containing wastewater can be: high-salinity wastewater in chemical industry, printing and dyeing, papermaking, pharmacy and other industries. The salt content of the high-salt wastewater entering the evaporative crystallization device is more than 10000mg/L, for example, 10000, 20000, 30000mg/L, preferably 50000 mg/L. In order to further improve the concentration efficiency of the system and reduce the investment cost of a multi-stage flash evaporation device (because the multi-stage flash evaporation is a complete system), the concentration of the high-salinity wastewater before entering the multi-stage flash evaporation is further concentrated. Therefore, the flash evaporation is firstly carried out, and then the multistage flash evaporation is carried out. If the salt content of the high-salt wastewater is less than 10000mg/L, the wastewater needs to be forcibly evaporated for a plurality of times at the expansion evaporation device. And the next stage of process (namely a multistage flash evaporation device) can be carried out until the salt content is more than 10000 mg/L.
The COD of the high-salt wastewater entering the evaporative crystallization device is less than 100mg/L, for example, 50 mg/L, 30 mg/L, 10 mg/L and the like, preferably 10 mg/L.
The content of suspended matters of the high-salt wastewater entering the evaporative crystallization device is less than 100mg/L, for example, 50 mg/L, 30 mg/L, 10 mg/L and the like, preferably 10 mg/L.
The heat conducting oil is heated to 400-plus-500 ℃ by the groove-type paraboloid light-gathering heat-collecting unit, and the temperature is reduced to 100-plus-200 ℃ after heat exchange by the expansion evaporation device and the evaporation crystallization device.
The steam-water ratio of the expansion evaporation device is 1:3-1: 5. The water making ratio of the evaporative crystallization device is more than 10.
Claims (2)
1. A system for high-salinity wastewater evaporation crystallization by utilizing photo-thermal energy is characterized by comprising a high-salinity wastewater conveying device, wherein the high-salinity wastewater conveying device is connected with a capacity expansion evaporation device which is connected with an evaporation crystallization device; the high-salinity wastewater conveying device is provided with a preheated water input end and a preheated water output end;
the trough parabolic light and heat collecting unit is connected with the expansion evaporation device and the evaporation crystallization device in sequence through a heat conducting oil circulating pipeline and is connected back to the trough parabolic light and heat collecting unit; the groove type paraboloid light and heat gathering unit is also connected with the molten salt heat storage unit.
2. The system for high-salinity wastewater crystallization by utilizing photothermal evaporation as claimed in claim 1, wherein the volume expansion evaporation device and the evaporative crystallization device are provided with steam output ends, the steam output ends are connected with the preheated water input ends of the high-salinity wastewater delivery devices, and the preheated water output ends are connected with the distilled water collection unit.
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| CN202021114811.1U CN212269520U (en) | 2020-06-16 | 2020-06-16 | High-salinity wastewater system utilizing photo-thermal evaporation crystallization |
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| CN202021114811.1U CN212269520U (en) | 2020-06-16 | 2020-06-16 | High-salinity wastewater system utilizing photo-thermal evaporation crystallization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111620402A (en) * | 2020-06-16 | 2020-09-04 | 中国电力工程顾问集团华北电力设计院有限公司 | System and method for high-salinity wastewater through photo-thermal evaporation crystallization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111620402A (en) * | 2020-06-16 | 2020-09-04 | 中国电力工程顾问集团华北电力设计院有限公司 | System and method for high-salinity wastewater through photo-thermal evaporation crystallization |
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