CN111252979A - Thermal method seawater desalination water post-treatment system for municipal water supply - Google Patents

Thermal method seawater desalination water post-treatment system for municipal water supply Download PDF

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Publication number
CN111252979A
CN111252979A CN202010039203.7A CN202010039203A CN111252979A CN 111252979 A CN111252979 A CN 111252979A CN 202010039203 A CN202010039203 A CN 202010039203A CN 111252979 A CN111252979 A CN 111252979A
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China
Prior art keywords
carbon dioxide
pipeline
seawater desalination
water
liquid
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Pending
Application number
CN202010039203.7A
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Chinese (zh)
Inventor
张令品
韩克鑫
刘艳辉
徐克�
李强
吴水波
苗超
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Tianjin Institute of Seawater Desalination and Multipurpose Utilization MNR
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Tianjin Institute of Seawater Desalination and Multipurpose Utilization MNR
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Priority to CN202010039203.7A priority Critical patent/CN111252979A/en
Publication of CN111252979A publication Critical patent/CN111252979A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection
    • 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
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2

Abstract

The invention discloses a hot method seawater desalination water post-treatment system for municipal water supply, wherein a hot method seawater desalination device is sequentially connected with an air blower, a gas scrubber, an activated carbon filter, a compressor and a carbon dioxide absorber through pipelines; the liquid carbon dioxide storage tank is sequentially connected with the gasifier, the pressure regulating device and the carbon dioxide absorber through pipelines; a fresh water outlet of the thermal method seawater desalination device is connected with a fresh water pump through a pipeline and then divided into two strands, one strand is connected with a carbon dioxide absorber; the other strand is connected with a product water mixing pool through a pipeline; the carbon dioxide absorber is connected with the limestone mineralization device, the carbon dioxide degasser and the product water mixing tank in sequence through pipelines. The system can improve the hardness and alkalinity of the desalted water, reduce the impact on a pipe network, fully utilize carbon dioxide discharged by a seawater desalting device, reduce the carbon discharge of a desalting system, reduce the using amount of liquid carbon dioxide and reduce the cost of the post-treatment of the desalted water.

Description

Thermal method seawater desalination water post-treatment system for municipal water supply
Technical Field
The invention belongs to the technical field of seawater desalination post-treatment, and relates to a thermal method seawater desalination post-treatment system for municipal water supply.
Background
With the shortage of water resources, the utilization of the desalinated seawater as new municipal water supply and emergency water source is an important technical measure for ensuring water safety in the future. The desalted water enters the pipe network and needs a matched mineralization post-treatment technology so as to reduce the impact on the pipe network.
At present, the post-treatment process of seawater desalination water commonly used at home and abroad mainly comprises a blending and adjusting process with other water bodies (the water body for blending can be seawater, underground brackish water or surface fresh water), a slaked lime mineralization process and a limestone mineralization process. For blending conditioning techniques, only partial water quality indicators are typically achieved, and other unwanted ionic components (e.g., sulfate, etc.) are introduced and increase the risk of viral and other microbial contamination. The hydrated lime can increase the hardness of the water body, but does not increase the alkalinity of the carbonate, and carbon dioxide is required to be introduced in advance or sodium carbonate (or sodium bicarbonate) is required to be added to increase the concentration of the carbonate in the water. In recent years, from the viewpoint of reducing the cost of post-treatment of desalinated water, the application of a limestone mineralization technology instead of a slaked lime method is increasing.
The limestone mineralization technology is that desalted water is introduced into a mineralization reactor filled with limestone, and calcium ions and carbonate ions are released into the water through dissolution of the limestone. To facilitate the dissolution of calcium carbonate, the desalinated water needs to be acidified with carbon dioxide first. At present, liquid CO is mainly adopted2The desalinated water is acidified after vaporization, so the treatment cost is higher. In the process of seawater desalination by a thermal method, CO dissolved in seawater is increased in temperature and reduced in pressure2May precipitate out. This fraction of CO is currently2The gas is directly discharged into the atmosphere, so that the carbon emission of a desalination system is increased, and the ecological environment is negatively influenced.
In order to further reduce the cost of the seawater desalination post-treatment, a hot method seawater desalination post-treatment system for municipal water supply needs to be developed urgently.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a hot-method seawater desalination post-treatment system for municipal water supply, which can reduce carbon emission of the hot-method seawater desalination system and reduce the post-treatment cost of seawater desalination.
The technical scheme of the invention is summarized as follows:
a hot method seawater desalination water post-treatment system for municipal water supply comprises a hot method seawater desalination device 1, wherein a non-condensable gas outlet of the hot method seawater desalination device 1 is sequentially connected with an air blower 2, a gas scrubber 3, an active carbon filter 4, a compressor 5 and an air inlet of a carbon dioxide absorber 12 through pipelines; the liquid carbon dioxide storage tank 6 is sequentially connected with the gasifier 7, the pressure regulating device 8 and the air inlet of the carbon dioxide absorber 12 through pipelines; a fresh water outlet of the thermal method seawater desalination device 1 is connected with a fresh water pump 9 through a pipeline and then divided into two strands, and one strand is connected with a water inlet of a carbon dioxide absorber 12; the other strand is connected with a product water mixing pool 15 through a pipeline; the pipeline between the fresh water pump 9 and the product water mixing tank 15 is connected with ClO through a pipeline2An adding device 10 and a NaOH adding device 11; the outlet of the carbon dioxide absorber 12 is connected with a limestone mineralization device 13 and a carbon dioxide degasser 14 in sequence through pipelines and then connected with a product water mixing pool 15.
Preferably: a carbon dioxide catcher 16 and a carbon dioxide regenerator 17 are arranged between the hot method seawater desalination device 1 and the air blower 2, a non-condensable gas outlet of the hot method seawater desalination device 1 is connected with a gas inlet in the middle of the carbon dioxide catcher 16 through a pipeline, a liquid outlet at the bottom of the carbon dioxide catcher 16 is connected with an absorption liquid pump 18 through a pipeline and then connected with a liquid inlet in the middle of the carbon dioxide regenerator 17, a liquid outlet at the bottom of the carbon dioxide regenerator 17 is connected with a regeneration liquid pump 19 through a pipeline and then connected with a liquid inlet in the middle of the carbon dioxide catcher 16, and a gas outlet at the top of the carbon dioxide regenerator 17 is connected with the air blower 2 through a pipeline.
Preferably: the heat method seawater desalination device 1 is a multi-effect distillation desalination device or a multi-stage flash evaporation desalination device.
The invention has the advantages that:
(1) the system of the invention can improve the hardness and alkalinity of the desalted water and reduce the impact on the pipe network.
(2) The system can fully utilize the carbon dioxide discharged by the seawater desalination device and reduce the carbon discharge of the desalination system.
(3) The system of the invention can reduce the consumption of liquid carbon dioxide and reduce the cost of the post-treatment of desalinated water.
Drawings
FIG. 1 is a schematic diagram of a thermal desalination post-treatment system for municipal water according to the invention.
Fig. 2 is a schematic diagram of a thermal seawater desalination post-treatment system for municipal water supply provided with a carbon dioxide trap and a carbon dioxide regenerator between a thermal seawater desalination device and a blower according to the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A hot method seawater desalination water post-treatment system (see figure 1) for municipal water supply comprises a hot method seawater desalination device 1, wherein a non-condensable gas outlet of the hot method seawater desalination device 1 is sequentially connected with an air blower 2, a gas scrubber 3, an active carbon filter 4, a compressor 5 and an air inlet of a carbon dioxide absorber 12 through pipelines; the liquid carbon dioxide storage tank 6 is sequentially connected with the gasifier 7, the pressure regulating device 8 and the air inlet of the carbon dioxide absorber 12 through pipelines; a fresh water outlet of the thermal method seawater desalination device 1 is connected with a fresh water pump 9 through a pipeline and then divided into two strands, and one strand is connected with a water inlet of a carbon dioxide absorber 12; the other strand is connected with a product water mixing pool 15 through a pipeline; the pipeline between the fresh water pump 9 and the product water mixing tank 15 is connected with ClO through a pipeline2An adding device 10 and a NaOH adding device 11; the outlet of the carbon dioxide absorber 12 is connected with a limestone mineralization device 13 and a carbon dioxide degasser 14 in sequence through pipelines and then connected with a product water mixing pool 15.
Preferably: a carbon dioxide catcher 16 and a carbon dioxide regenerator 17 are arranged between the hot method seawater desalination device 1 and the air blower 2, a non-condensable gas outlet of the hot method seawater desalination device 1 is connected with a gas inlet in the middle of the carbon dioxide catcher 16 through a pipeline, a liquid outlet at the bottom of the carbon dioxide catcher 16 is connected with an absorption liquid pump 18 through a pipeline and then connected with a liquid inlet in the middle of the carbon dioxide regenerator 17, a liquid outlet at the bottom of the carbon dioxide regenerator 17 is connected with a regeneration liquid pump 19 through a pipeline and then connected with a liquid inlet in the middle of the carbon dioxide catcher 16, and a gas outlet at the top of the carbon dioxide regenerator 17 is connected with the air blower 2 through a pipeline.
Preferably: the heat method seawater desalination device 1 is a multi-effect distillation desalination device or a multi-stage flash evaporation desalination device.
The particle size of limestone in the limestone mineralization device 13 is preferably 4mm to 6mm, and limestone needs to be added regularly as a filler in the operation of the system.
A carbon dioxide catcher 16 and a carbon dioxide regenerator 17 are arranged between the thermal seawater desalination device 1 and the blower 2, so that carbon dioxide in the non-condensable gas discharged from the thermal seawater desalination device 1 is captured and regenerated, the carbon dioxide enters the blower 2, and other components in the non-condensable gas are discharged to the atmosphere in the carbon dioxide catcher 16.
The working principle of the system of the invention is as follows:
the non-condensable gas discharged by the hot method seawater desalination device is washed, filtered and purified by an activated carbon filter, and then introduced into a carbon dioxide absorber 12 to be contacted with fresh water pumped out by a fresh water pump of the hot method seawater desalination device, so that the acidity of the fresh water is improved, the fresh water enters a limestone mineralizer to react with limestone in the limestone mineralizer, the hardness and the alkalinity are improved, and the impact on a pipe network is reduced. The system realizes the utilization of carbon dioxide discharged by the hot method seawater desalination device and reduces the carbon discharge of the system. Compared with the traditional process, the method reduces the consumption of liquid carbon dioxide and the cost of the post-treatment of the desalted water.
The specific implementation steps are as follows:
the fresh water of the hot method seawater desalination device is led out by a fresh water pump and then is divided into two paths, wherein the fresh water of one path is carbonated in a carbon dioxide absorber to reduce the pH value of the fresh water, then enters a limestone mineralizer to react with limestone in the limestone mineralizer to improve the hardness and alkalinity, then enters a carbon dioxide degasser to remove excessive carbon dioxide gas in the water, and then passes through ClO with the other path2Fresh water after disinfection and pH value adjustment of water by NaOH is uniformly mixed in a product water mixing pool, so that Langerl index LSI reaches the range (+0.1 to +0.3) specified by Drinking Water guide of world health organization. The carbon dioxide introduced into the carbon dioxide absorber has two sources, wherein the main part is from a hot seawater desalination device, and the other part is obtained by gasifying liquid carbon dioxide. The non-condensable gas discharged by the hot method seawater desalination device is introduced into a gas scrubber through a blower and washed by permanganate aqueous solution, and the washed gas enters an activated carbon filter again to be filtered to reach food grade and then is introduced into a carbon dioxide absorber. After the liquid carbon dioxide in the liquid carbon dioxide storage tank is gasified by the gasifier, the pressure of the liquid carbon dioxide is reduced by the pressure regulating device, and then the liquid carbon dioxide is introduced into the carbon dioxide absorber.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A hot method seawater desalination water post-treatment system for municipal water supply comprises a hot method seawater desalination device (1) and is characterized in that a non-condensable gas outlet of the hot method seawater desalination device (1) is sequentially connected with an air blower (2), a gas scrubber (3), an activated carbon filter (4), a compressor (5) and an air inlet of a carbon dioxide absorber (12) through pipelines; the liquid carbon dioxide storage tank (6) is connected with the pipeline in turnThe gasifier (7) is connected with the pressure regulating device (8) and the air inlet of the carbon dioxide absorber (12); a fresh water outlet of the hot method seawater desalination device (1) is connected with a fresh water pump (9) through a pipeline and then divided into two strands, one strand is connected with a water inlet of a carbon dioxide absorber (12); the other strand is connected with a product water mixing pool (15) through a pipeline; the pipeline between the fresh water pump (9) and the product water mixing tank (15) is connected with ClO through a pipeline2A feeding device (10) and a NaOH feeding device (11); the outlet of the carbon dioxide absorber (12) is connected with a limestone mineralization device (13) and a carbon dioxide degasser (14) in sequence through pipelines and then is connected with a product water mixing pool (15).
2. The system of claim 1, wherein a carbon dioxide trap (16) and a carbon dioxide regenerator (17) are arranged between the hot-process seawater desalination device (1) and the blower (2), a non-condensable gas outlet of the hot-process seawater desalination device (1) is connected with a gas inlet in the middle of the carbon dioxide trap (16) through a pipeline, a liquid outlet at the bottom of the carbon dioxide trap (16) is connected with a liquid inlet in the middle of the carbon dioxide regenerator (17) after being connected with an absorption liquid pump (18) through a pipeline, a liquid outlet at the bottom of the carbon dioxide regenerator (17) is connected with a liquid inlet in the middle of the carbon dioxide trap (16) after being connected with a regeneration liquid pump (19) through a pipeline, and a gas outlet at the top of the carbon dioxide regenerator (17) is connected with the blower (2) through a pipeline.
3. The system according to claim 1 or 2, characterized in that the thermal desalination plant (1) is a multi-effect distillation desalination plant or a multi-stage flash desalination plant.
CN202010039203.7A 2020-01-14 2020-01-14 Thermal method seawater desalination water post-treatment system for municipal water supply Pending CN111252979A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1093440A (en) * 1965-11-15 1967-12-06 Andrew Checkovich Production of potable water from sea water
EP0187432A1 (en) * 1985-01-10 1986-07-16 Sasakura Engineering Co. Ltd. Aftertreatment of distilled water
CN101314102A (en) * 2008-05-30 2008-12-03 西安热工研究院有限公司 Method and apparatus for collecting carbonic anhydride in coal-fired plant flue gas
CN102826689A (en) * 2012-09-18 2012-12-19 杭州水处理技术研究开发中心有限公司 Post-treatment process and equipment of desalted seawater
CN203648344U (en) * 2013-11-25 2014-06-18 中石化石油工程设计有限公司 Carbon dioxide capture experiment evaluation testing device
CN205556303U (en) * 2016-03-08 2016-09-07 碧海舟（北京）节能环保装备有限公司 A mineralize mineralization system for desalinating sea water
CN106608692A (en) * 2015-10-23 2017-05-03 天津科技大学 Efficient and controllable desalinated seawater mineralization process

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1093440A (en) * 1965-11-15 1967-12-06 Andrew Checkovich Production of potable water from sea water
EP0187432A1 (en) * 1985-01-10 1986-07-16 Sasakura Engineering Co. Ltd. Aftertreatment of distilled water
CN101314102A (en) * 2008-05-30 2008-12-03 西安热工研究院有限公司 Method and apparatus for collecting carbonic anhydride in coal-fired plant flue gas
CN102826689A (en) * 2012-09-18 2012-12-19 杭州水处理技术研究开发中心有限公司 Post-treatment process and equipment of desalted seawater
CN203648344U (en) * 2013-11-25 2014-06-18 中石化石油工程设计有限公司 Carbon dioxide capture experiment evaluation testing device
CN106608692A (en) * 2015-10-23 2017-05-03 天津科技大学 Efficient and controllable desalinated seawater mineralization process
CN205556303U (en) * 2016-03-08 2016-09-07 碧海舟（北京）节能环保装备有限公司 A mineralize mineralization system for desalinating sea water

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Application publication date: 20200609