CN113666564A - Outer drainage processing system of current conversion station - Google Patents

Outer drainage processing system of current conversion station Download PDF

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Publication number
CN113666564A
CN113666564A CN202111096084.XA CN202111096084A CN113666564A CN 113666564 A CN113666564 A CN 113666564A CN 202111096084 A CN202111096084 A CN 202111096084A CN 113666564 A CN113666564 A CN 113666564A
Authority
CN
China
Prior art keywords
water
unit
separator
mother liquor
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111096084.XA
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Chinese (zh)
Inventor
滕济林
李若征
朱霞
田颖
王灿
刘谡飞
李郑坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Guodian Futong Science and Technology Development Co Ltd
NARI Group Corp
Original Assignee
Beijing Guodian Futong Science and Technology Development Co Ltd
NARI Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Guodian Futong Science and Technology Development Co Ltd, NARI Group Corp filed Critical Beijing Guodian Futong Science and Technology Development Co Ltd
Priority to CN202111096084.XA priority Critical patent/CN113666564A/en
Publication of CN113666564A publication Critical patent/CN113666564A/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
    • B01D1/00—Evaporating
    • B01D1/26—Multiple-effect evaporating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0033—Other features
    • B01D5/0039—Recuperation of heat, e.g. use of heat pump(s), compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
    • 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
    • C02F1/048—Purification of waste water by 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/06—Flash 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4691—Capacitive deionisation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/008—Mobile apparatus and plants, e.g. mounted on a vehicle
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/06—Pressure conditions
    • C02F2301/066—Overpressure, high pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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
    • C02F2303/10—Energy recovery
    • 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
    • C02F2303/16—Regeneration of sorbents, filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents

Abstract

The invention discloses an external drainage treatment system of a converter station, which comprises an electrically-driven thickening unit, a steam recompression unit, a control unit, a product water tank and a mother liquor tank, wherein the external drainage is treated by the electrically-driven thickening unit, fresh water is directly discharged into the product water tank, and concentrated water enters a separator for evaporation separation after being preheated and heated; the steam is heated and pressurized by the compressor, condensed by the heater to be product water, then recovered by the preheater, and finally discharged into a product water tank for recycling, and the mother liquor in the separator is periodically discharged. According to the invention, no chemical needs to be added in the water treatment process, the energy consumption is low, the cleaning step is simple, the acid consumption is low, the electrode flux after cleaning is not attenuated, the treated produced water can be recycled, the recovery rate is high, and the water yield is not influenced by temperature; the system has strong anti-pollution capability, long service life and low requirement on water inlet quality, and can be used for water quality with high hardness and high sulfate. The cleaning cycle is long, the maintenance difficulty and the cost are low, the functions are comprehensive, no sludge is generated, and the integration level is high.

Description

Outer drainage processing system of current conversion station
Technical Field
The invention relates to a water treatment system, in particular to an external drainage treatment system of a convertor station.
Background
The converter station discharged water comprises converter valve and phase modifier cooling system discharged water and reverse osmosis concentrated water, backwashing water of a filter and ion exchange regenerated water, and the discharged water amount of the whole plant is 8-40 tons/hour. The part of the discharged water has high salt content, particularly high chloride ions and hardness ions. Most of the current direct current engineering converter stations are located in remote ecological sensitive areas, no drainage pipe network is arranged nearby, no suitable water body is contained, targeted wastewater treatment or emission control measures are lacked, large amounts of high-salinity wastewater is discharged to cause salinization of soil and water body easily, ecological environment damage is caused, potential environmental pollution or environmental dispute risks are brought, and water resources are seriously wasted.
At present, most of discharged water outside the converter station is stored in nearby ditches, rivers and ditches or evaporation ponds, mature treatment technologies and schemes are not formed, and a large amount of water resources are wasted. Taking the north-opened flexible direct current project as an example, the region in which the project is being constructed is dry, water resources are short, the natural ecological environment is fragile, and the external drainage is stored in an evaporation tank outside the station, for example, the overflow of the evaporation tank easily causes ecological or environmental events. The direct discharge mode of the existing converter station external drainage is difficult to meet the environmental protection standard, and a large amount of external drainage can become potential risk points of environmental pollution events caused by the operation of a direct current power grid at any time. For example, in the utility model patent with the publication number of CN22865040U, an external cooling circulating water zero-discharge treatment system for a dc converter station is provided, in which the external cooling water sequentially enters a self-cleaning filter, a tubular microfiltration device and a second-stage reverse osmosis filter for filtration and then flows back to a spray water tank, so that the utilization rate of the external cooling water is improved; shandong electric power overhaul company proposed an external drainage treatment scheme: the external drainage water passes through the multi-medium filter and the activated carbon filter in sequence, then the medicine is added, the reverse osmosis system is removed, and the produced water returns to the balance water tank again. However, the reverse osmosis system has the problem of blockage, so that the reverse osmosis system unit cannot supplement water to the balance water tank; the replacement period is frequent, and the operation cost is high; the chemical feeding system makes the composition of the discharged water complex, and the water discharge index is difficult to meet the environmental protection requirement; high-dosage medicines and generated sludge need to be disposed, and the maintenance difficulty and the cost are high.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an external drainage water treatment system of a converter station, which has high efficiency and simple maintenance.
The technical scheme is as follows: the system is characterized by comprising an electrically-driven thickening unit, a steam recompression unit, a control unit, a product water tank and a mother liquid tank, wherein the drained water is connected with the product water tank through a first fresh water pipeline through the electrically-driven thickening unit, the electrically-driven thickening unit is connected with the steam recompression unit through the first thick water pipeline, and the steam recompression unit is connected with the mother liquid tank through a second fresh water pipeline product water tank and a mother liquid pipeline.
The steam recompression unit comprises a preheater, a heater, a separator and a compressor, wherein a cold side inlet of the preheater is connected with a concentrated water outlet of the electric-drive enrichment unit through a first concentrated water pipeline, and a cold side outlet of the preheater is connected with the separator through a second concentrated water pipeline.
The mother liquor circulation loop enters a heater tube pass inlet from an outlet at the bottom of the separator through a mother liquor pipeline and returns to the separator through a heater tube pass outlet.
The steam circulation loop enters the compressor from the top of the separator, enters the heater shell side inlet from the outlet of the compressor, enters the hot side inlet of the preheater from the shell side outlet of the heater, and is connected with a second fresh water pipeline through the hot side outlet of the preheater.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: according to the invention, no chemical needs to be added in the water treatment process, the energy consumption is low, only 1/2-1/3 of a membrane method is adopted, the cleaning step is simple compared with membrane equipment, the acid consumption is low, the electrode flux after cleaning is not attenuated, the treated produced water meets the water replenishing requirement and can be recycled, the recovery rate is up to more than 95%, and the produced water is not influenced by temperature; the system has strong anti-pollution capability, long service life, low requirement on water inlet quality, high hardness and high sulfate water quality, high COD tolerance degree and no sludge after system treatment. The equipment integration level is high, the occupied area is small, the use environment of the converter station is met, the converter station runs in a fully-electric mode, the automation degree is high, and remote monitoring can be achieved. The cleaning cycle is long, the maintenance difficulty and the cost are low, the functions are comprehensive, no sludge is generated, and the integration level is high.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the system for treating the discharged water of the converter station comprises an electric-drive concentration-increasing unit 1, a steam recompression unit, a control unit, a product water tank 7 and a mother liquor tank 6; the product water tank 7 is connected through first fresh water pipeline to the fresh water export of outer drainage through the electricity drive enrichment unit 1, and the electricity drives enrichment unit 1 and connects the vapor recompression unit through first dense water pipeline, and the vapor recompression unit passes through second fresh water pipeline and connects product water tank 7, connects mother liquor case 6 through mother liquor delivery pipe. The steam recompression unit comprises a preheater 2, a heater 3, a separator 4 and a compressor 5, wherein the heater 3 is in a shell-and-tube structure; the cold side inlet of the preheater 2 is connected with the concentrated water outlet of the electric-drive concentration-increasing unit 1 through a first concentrated water pipeline, and the cold side outlet of the preheater 2 is connected with the separator 4 through a second concentrated water pipeline. The mother liquor circulation loop enters the tube pass inlet of the heater 3 from the outlet at the bottom of the separator 4 through a mother liquor pipeline and returns to the separator 4 through the tube pass outlet of the heater 3. The steam circulation loop enters the compressor 5 from the top of the separator 4, enters the shell side inlet of the heater 3 from the outlet of the compressor 5, enters the hot side inlet of the preheater 2 from the shell side outlet of the heater 3, and is connected with a second fresh water pipeline through the hot side outlet of the preheater 2.
The system of the invention works as follows:
the discharged water firstly enters the electrically-driven thickening unit 1, an electrode is arranged in the electrically-driven thickening unit, an electrostatic field is formed under the action of voltage, ions in the water are adsorbed and temporarily stored on the surface of the electrode, and therefore the discharged water almost contains no ions and reaches the relevant standard of reuse water. When the electric field is removed, the ions adsorbed on the electrode return to the solution again to form concentrated solution, and the concentrated solution enters a steam recompression unit to be thickened continuously.
The water produced by the electrically-driven concentration increasing unit can reach 85% -90%, the concentrated water goes to the steam recompression unit, passes through the condensed water preheater 2, absorbs the heat of the condensed water, enters the heater 3 to be heated to a near boiling point, then enters the separation chamber 4 to be subjected to flash evaporation, the separated secondary steam goes to the compressor 5, is compressed, pressurized and heated, then is introduced into the shell pass of the heater 3 to serve as a heat source, is condensed into the condensed water to be recycled at last, and is discharged to the product water tank 7. The concentrated mother liquor is transported out periodically. The water recovery rate of the whole system reaches more than 95 percent.
The system does not need to add chemicals, ions in water are adsorbed by the electrodes and stored in the double electric layers under the action of an electric field, so that the ions are separated from water, COD (chemical oxygen demand) and TOC (total organic carbon) in the water can be degraded, and purified product water is obtained.
The electrode regeneration is simple and easy, and no sludge is generated. The method can adopt timing cleaning to wash and discharge salt out of the equipment along with water flow, and adopts dilute acid cleaning if necessary, and compared with membrane equipment, the cleaning steps are simple, the acid consumption is less, and the flux of the cleaned electrode is not attenuated. The electrode material can be three-dimensional porous nano material, and can be activated carbon with ultrahigh specific surface area. The system has strong anti-pollution capability, the service life can reach 8 years, the system is suitable for the water quality with high hardness and high sulfate, and the COD tolerance degree is high.
The system arrangement adopts container arrangement and integrated design, the container can be operated only by being transported to the site and being connected with electricity and water, the occupied area of the equipment is small, and the equipment conforms to the use environment of the convertor station; the control program can make the system have the automatic regulating function, the measured value of the conductivity is interlocked with the current or the voltage, etc., and the system is suitable for the fluctuation of different water qualities; the remote monitoring function can feed back on-line monitoring's data to collection APP and computer end, makes things convenient for the operation personnel to control.

Claims (6)

1. The utility model provides an outer drainage processing system of converter station, its characterized in that, the system is including inside electricity that is equipped with the electrode drive enrichment unit (1), steam recompression unit, the control unit, product water tank (7) and mother liquor case (6), outer drainage drives enrichment unit (1) through first fresh water pipeline connection product water tank (7) through electricity, electricity drives enrichment unit (1) and connects steam recompression unit through first dense water pipeline, steam recompression unit passes through second fresh water pipeline product water tank (7), through mother liquor delivery pipe connection mother liquor case (6).
2. The system for treating the discharged water of the converter station according to claim 1, wherein the steam recompression unit comprises a preheater (2), a heater (3), a separator (4) and a compressor (5), wherein a cold side inlet of the preheater (2) is connected with a concentrated water outlet of the electrically-driven enrichment unit (1) through a first concentrated water pipeline, and a cold side outlet of the preheater (2) is connected with the separator (4) through a second concentrated water pipeline.
3. The system for treating the discharged water of the converter station according to claim 1, wherein the mother liquor circulation loop is led from the outlet at the bottom of the separator (4) to the tube side inlet of the heater (3) through a mother liquor pipeline and is led back to the separator (4) through the tube side outlet of the heater (3).
4. The converter station external discharge water treatment system according to claim 1, wherein the steam circulation loop enters the compressor (5) from the top outlet of the separator (4), enters the shell-side inlet of the heater (3) from the outlet of the compressor (5), enters the hot-side inlet of the preheater (2) from the shell-side outlet of the heater (3), and is connected with the second fresh water pipeline through the hot-side outlet of the preheater (2).
5. An effluent treatment system outside a converter station according to claim 1, characterized in that the electrodes of said electrically driven concentration-enhancing unit (1) are made of three-dimensional porous nanomaterial.
6. The converter station effluent treatment system of claim 1 wherein said system components are mounted in a container.
CN202111096084.XA 2021-09-15 2021-09-15 Outer drainage processing system of current conversion station Pending CN113666564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111096084.XA CN113666564A (en) 2021-09-15 2021-09-15 Outer drainage processing system of current conversion station

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Application Number Priority Date Filing Date Title
CN202111096084.XA CN113666564A (en) 2021-09-15 2021-09-15 Outer drainage processing system of current conversion station

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CN113666564A true CN113666564A (en) 2021-11-19

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118780A1 (en) * 2002-12-20 2004-06-24 Barnstead/Thermolyne Corporation Water purification system and method
CN107140779A (en) * 2017-07-06 2017-09-08 重集团大连工程技术有限公司 The zero-discharge treatment system and its processing method of a kind of nuclear power plant evaporator sewer
CN107954560A (en) * 2017-11-08 2018-04-24 西安协力动力科技有限公司 The technique that vapor recompression is concentrated by evaporation joint flue spray technique processing waste water
CN108217864A (en) * 2016-12-15 2018-06-29 常州光成科技开发有限公司 The system and method that a kind of salt by sewage is detached with organic matter
CN210656555U (en) * 2019-10-11 2020-06-02 北京中科奥水环保工程技术有限公司 Brackish water treatment facilities based on electrosorption technology

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040118780A1 (en) * 2002-12-20 2004-06-24 Barnstead/Thermolyne Corporation Water purification system and method
CN108217864A (en) * 2016-12-15 2018-06-29 常州光成科技开发有限公司 The system and method that a kind of salt by sewage is detached with organic matter
CN107140779A (en) * 2017-07-06 2017-09-08 重集团大连工程技术有限公司 The zero-discharge treatment system and its processing method of a kind of nuclear power plant evaporator sewer
CN107954560A (en) * 2017-11-08 2018-04-24 西安协力动力科技有限公司 The technique that vapor recompression is concentrated by evaporation joint flue spray technique processing waste water
CN210656555U (en) * 2019-10-11 2020-06-02 北京中科奥水环保工程技术有限公司 Brackish water treatment facilities based on electrosorption technology

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
宋永辉等著, 冶金工业出版社 *

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