CN105692973A - Ultrapure water preparation system and urea solution preparation system for vehicles - Google Patents

Ultrapure water preparation system and urea solution preparation system for vehicles Download PDF

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Publication number
CN105692973A
CN105692973A CN201610216843.4A CN201610216843A CN105692973A CN 105692973 A CN105692973 A CN 105692973A CN 201610216843 A CN201610216843 A CN 201610216843A CN 105692973 A CN105692973 A CN 105692973A
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Prior art keywords
water
reverse osmosis
filter
pressure
water inlet
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CN201610216843.4A
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Inventor
张量
杨勇
曾威
张秀峰
龚轲
吕剑明
翟新春
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Zhuhai Gree Intelligent Equipment Co Ltd
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Zhuhai Gree Intelligent Equipment Co Ltd
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Priority to CN201610216843.4A priority Critical patent/CN105692973A/en
Publication of CN105692973A publication Critical patent/CN105692973A/en
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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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C273/00—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C273/02—Preparation of urea or its derivatives, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/04—Non-contaminated water, e.g. for industrial water supply for obtaining ultra-pure water
    • 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
    • C02F2209/03—Pressure
    • 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
    • C02F2209/05—Conductivity or salinity
    • 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
    • C02F2209/40—Liquid flow rate
    • 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
    • C02F2209/42—Liquid level
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to an ultrapure water preparation system and a urea solution preparation system for vehicles, belonging to the technical field of ultrapure water preparation. The ultrapure water preparation system comprises a pretreatment device, an RO (reverse osmosis) treatment device and an EDI (electrodeionization) treatment device which are sequentially connected, wherein the pretreatment device comprises a filter assembly; the RO treatment device comprises an RO treatment unit or a plurality of RO treatment units arranged in series and parallel; each RO treatment unit comprises an RO membrane element or a plurality of RO membrane elements; and the EDI treatment device comprises a water inlet control unit, a water inlet detection adjustment unit, an EDI treatment unit, a produced water monitoring unit and an ultrapure water collection unit which are sequentially connected. The urea solution preparation system for vehicles comprises the ultrapure water preparation system. The ultrapure water preparation system and urea solution preparation system for vehicles are mainly used for implementing miniaturization and automation on the ultrapure water preparation system, so that the prepared ultrapure water has stable quality.

Description

Ultrapure water preparation system and automobile-used urea solution preparation system
Technical Field
The invention relates to the technical field of ultrapure water preparation, in particular to an ultrapure water preparation system and a vehicle urea solution preparation system.
Background
The vehicle urea is an aqueous urea solution having a urea concentration of 32.5% and an ultrapure water as a solvent, and raw materials thereof include urea particles and ultrapure water. The urea for the vehicle is used as a catalytic reducing agent when the tail gas of diesel vehicles such as heavy trucks, buses and the like is treated, so that the tail gas of the vehicle can reach the standard emission.
The urea solution for vehicles at the present stage is mainly obtained in a chemical plant production mode, and the core equipment of the urea solution is ultrapure water production equipment used for dissolving urea particles. However, the ultrapure water production apparatus has at least the following technical problems: the equipment has long working procedures and large occupied area, needs a plurality of professional personnel for operation and maintenance, and needs dangerous chemicals such as strong acid, strong alkali and the like. At present, no miniaturized integrated automatic ultrapure water preparation system is applied to the vehicle urea solution preparation all-in-one machine to realize intelligent ultrapure water production.
Disclosure of Invention
In view of the above, the present invention provides an ultrapure water production system and a urea solution production system for a vehicle, and aims to miniaturize the ultrapure water production system and stabilize the quality of the produced ultrapure water.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides an ultrapure water preparation system, which includes a pretreatment device, a reverse osmosis treatment device, and an EDI treatment device, which are sequentially connected by a pipeline; wherein,
the pretreatment device comprises a filtering component for primary filtering of raw water;
the reverse osmosis treatment device is used for performing reverse osmosis treatment on the water after the primary filtration; wherein the reverse osmosis treatment device comprises a reverse osmosis treatment unit or a plurality of reverse osmosis treatment units which are arranged in series and parallel; and each of the reverse osmosis treatment units comprises one RO reverse osmosis membrane element or a plurality of RO reverse osmosis membrane elements;
the EDI treatment device is used for carrying out EDI treatment on the water subjected to reverse osmosis treatment; the EDI treatment device comprises a water inlet control unit, a water inlet detection and regulation unit, an EDI treatment unit, a water production monitoring unit and an ultrapure water collection unit which are sequentially connected through pipelines.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the filter assembly comprises one or more of a pre-filter, a filter element filter and an adsorption filter;
wherein, the filter element filter is a wire-wound filter element filter or a melt-blown PP cotton filter element filter;
the adsorption filter is a granular activated carbon filter or a carbon rod filter.
Preferably, the prefilter is a 40 μm stainless steel net prefilter to filter out particles above 40 μm in the raw water;
the wire-wound filter element filter is a stainless steel wire-wound filter element filter with the diameter of 10 mu m, so as to filter out particles or impurities with the diameter of more than 10 mu m in raw water;
the granular activated carbon filter is 10 mu m to adsorb residual chlorine contained in raw water.
Preferably, the filtration assembly further comprises an ultrafiltration membrane element; wherein the ultrafiltration membrane element is arranged on an upstream pipeline of the reverse osmosis treatment device.
Preferably, the ultrafiltration membrane element is a washable PVDF ultrafiltration membrane element.
Preferably, the ultrafiltration membrane element is connected with a first flushing pipeline for flushing the ultrafiltration membrane element; wherein, be provided with first washing control valve on the first washing pipeline to control the washing of ultrafiltration membrane element.
Preferably, the pretreatment device further comprises a pressure control assembly, wherein the pressure control assembly comprises:
the pressure reducing valve is arranged on an upstream pipeline of the pre-filter and is used for controlling the pressure of raw water entering the pretreatment device to be not more than a first set value;
the pressure sensor is arranged on a pipeline between the pre-filter and the wound filter element filter and is used for detecting the water outlet pressure of the pre-filter;
the control valve is arranged on a pipeline between the pressure sensor and the wound filter element filter; if the effluent pressure detected by the pressure sensor is less than a second set value, the control valve is in a closed state, and the pretreatment device stops working;
and the booster pump is arranged on a pipeline between the control valve and the winding filter element filter and used for boosting the water inlet pressure of the winding filter element filter to a third set value.
Preferably, the pretreatment device further comprises a water inlet control valve and a check valve; wherein,
the water inlet control valve is arranged on an upstream pipeline of the pressure reducing valve and is used for controlling raw water to enter the pretreatment device;
the check valve is arranged on a pipeline between the pressure reducing valve and the pre-filter and used for preventing air from entering the ultrapure water preparation system.
Preferably, each of the reverse osmosis treatment units further comprises:
the pressure flow detection assembly is arranged on an upstream pipeline of the RO reverse osmosis membrane element and is used for detecting the water inlet pressure and the water inlet flow of the reverse osmosis treatment unit;
the pressure flow regulating assembly is arranged on an upstream pipeline of the water inlet pressure detecting assembly and is used for regulating the water inlet pressure and the water inlet flow of the reverse osmosis treatment unit;
and the water production detection assembly is arranged on a downstream pipeline of the RO reverse osmosis membrane element and used for detecting the quality of the produced water of the reverse osmosis treatment unit.
Preferably, the pressure flow detection assembly comprises a pressure sensor and a flow meter;
the pressure and flow regulating assembly comprises a high-pressure pump and a first regulating valve; wherein the high-pressure pump is arranged on an upstream pipeline of the pressure flow detection assembly; the first regulating valve is arranged on a backflow branch which is connected with two ends of the high-pressure pump in parallel;
the water production detection assembly comprises a conductivity meter for detecting the quality of water produced by the reverse osmosis treatment unit.
Preferably, each reverse osmosis treatment unit further comprises a concentrate discharge assembly; wherein the concentrated water discharge assembly includes:
the concentrated water discharge pipeline is connected with a concentrated water discharge port of the RO reverse osmosis membrane element; a concentrated water discharge control valve for controlling the discharge of concentrated water, a pressure sensor for detecting the discharge pressure of concentrated water and a flowmeter for detecting the discharge flow of concentrated water are arranged on the concentrated water discharge pipeline;
the second flushing pipeline is connected with a concentrated water discharge port of the RO reverse osmosis membrane element; and a second flushing control valve is arranged on the second flushing pipeline to control the flushing of the RO reverse osmosis membrane element.
Preferably, the reverse osmosis treatment device comprises two reverse osmosis treatment units which are arranged in series and are respectively a first-stage reverse osmosis treatment unit and a second-stage reverse osmosis treatment unit; wherein,
the primary reverse osmosis treatment unit is used for performing primary reverse osmosis treatment on the water preliminarily filtered by the pretreatment device; the primary reverse osmosis treatment unit comprises two RO reverse osmosis membrane elements which are arranged in parallel;
the secondary reverse osmosis treatment unit is used for carrying out secondary reverse osmosis treatment on the water subjected to the primary reverse osmosis treatment; wherein the secondary reverse osmosis treatment unit comprises an RO reverse osmosis membrane element.
Preferably, the reverse osmosis treatment apparatus comprises a reverse osmosis treatment unit comprising an RO reverse osmosis membrane element.
Preferably, when the reverse osmosis treatment unit comprises a concentrated water discharge component, a check valve is further arranged on a concentrated water discharge pipeline of the secondary reverse osmosis treatment unit.
Preferably, the ultrapure water preparation system further comprises an intermediate water tank; wherein, the middle water tank is arranged on a downstream pipeline of the reverse osmosis treatment device and an upstream pipeline of the EDI treatment device and is used for collecting the produced water of the reverse osmosis treatment device.
Preferably, a liquid level control device is arranged on the intermediate water tank, and the liquid level control device is arranged on the intermediate water tank and used for controlling the set liquid level of the intermediate water tank; the set liquid level comprises a reserved highest water level and is used for preventing the intermediate water tank from overflowing when a highest water level control point of the intermediate water tank fails;
the middle water tank is also provided with a respirator for realizing the balance of the internal pressure of the middle water tank and ensuring that external solid particles cannot enter the middle water tank.
Preferably, the water inlet control unit in the EDI treatment apparatus includes: the water inlet pipeline, and an EDI booster pump and a water inlet control valve which are arranged on the water inlet pipeline; wherein the upstream end of the water inlet pipeline is communicated with the intermediate water tank; and the downstream end of the water inlet pipeline is communicated with the water inlet detection and regulation unit.
Preferably, the water inlet control unit further comprises a return branch connected in parallel with the water inlet pipeline; the downstream end of the return branch is connected with the intermediate water tank; and a second regulating valve is arranged on the backflow branch and used for regulating the water inlet pressure and the water inlet flow of the EDI treatment device.
Preferably, the EDI processing unit comprises a fresh water chamber and a concentrated water chamber; or the EDI processing unit comprises a fresh water chamber, a concentrated water chamber and an electrode water chamber.
Preferably, the water inlet detection and regulation unit of the EDI treatment device comprises a first branch and a second branch which are arranged in parallel;
the upstream ends of the first branch and the second branch are connected with the downstream end of the water inlet control unit;
the downstream end of the first branch is connected with the inlet of the fresh water chamber; the first branch is provided with a pressure sensor and a water inlet regulating valve and is used for detecting the water inlet pressure of the fresh water chamber and regulating the water inlet pressure and the water inlet flow of the fresh water chamber;
the downstream end of the second branch is connected with an inlet of the concentrated water chamber; the second branch is provided with a pressure sensor, a flowmeter and a water inlet regulating valve and is used for detecting and regulating the water inlet pressure and the water inlet flow of the concentrated water chamber;
when the EDI processing unit further comprises an electrode water chamber, the water inlet detection regulating unit of the EDI processing device further comprises a third branch which is connected with the first branch and the second branch in parallel; wherein,
the upstream end of the third branch is connected with the downstream end of the water inlet control unit; the downstream end of the third branch is connected with the inlet of the pole water chamber, and the third branch is provided with a pressure sensor, a flowmeter and a water inlet regulating valve and is used for detecting and regulating the water inlet pressure and the water inlet flow of the pole water chamber.
Preferably, the produced water monitoring unit of the EDI processing apparatus includes an electrical resistivity meter, and the electrical resistivity meter is disposed on the water outlet pipeline of the fresh water chamber.
Preferably, the ultrapure water collection unit comprises an ultrapure water collection water tank, and the ultrapure water collection water tank is connected with the water outlet pipeline of the fresh water chamber and is used for collecting the fresh water produced by the EDI processing unit.
In another aspect, an embodiment of the present invention provides a urea solution preparation system for a vehicle, including the ultrapure water preparation system described in any one of the above.
By means of the technical scheme, the ultrapure water preparation system and the automobile urea solution preparation system at least have the following beneficial effects:
the ultrapure water preparation system provided by the embodiment of the invention adopts a brand-new system design and mainly comprises a pretreatment device, a reverse osmosis treatment device and an EDI treatment device, and the three devices have compact structure and small occupied area, so that the miniaturization of the ultrapure water preparation system is realized. In addition, the ultrapure water preparation system prepares ultrapure water by sequentially carrying out primary filtration, reverse osmosis treatment and EDI treatment on raw water, and strong acid and strong alkali are not needed in the whole process, so that the quality of the ultrapure water is stable.
Furthermore, the pretreatment device provided by the embodiment of the invention can be used for well filtering silt, particles, colloid and microorganisms in raw water and well protecting a subsequent reverse osmosis treatment device by reasonably configuring the filtering component and the pressure control component; on the other hand, the pretreatment device is miniaturized and automated.
Furthermore, the reverse osmosis treatment device provided by the embodiment of the invention comprises a reverse osmosis treatment unit or a plurality of reverse osmosis treatment units arranged in series and parallel, and each reverse osmosis treatment unit is provided with one or a plurality of RO reverse osmosis membrane elements connected in series, a pressure flow detection assembly, a pressure flow regulation assembly, a produced water detection assembly and a concentrated water discharge assembly. Through the arrangement, the reverse osmosis effect of the reverse osmosis device is improved, the flow, pressure and water quality of inlet water and produced water of reverse osmosis treatment are monitored and adjusted on line, and automation and intellectualization of an ultrapure water preparation system are realized.
Furthermore, the EDI processing apparatus provided by the embodiment of the invention improves the EDI processing effect by arranging the water inlet control unit, the water inlet detection and adjustment unit, the EDI processing unit with the fresh water chamber, the concentrated water chamber and the polar water chamber, the water production monitoring unit and the ultrapure water collection unit, and realizes online monitoring and adjustment of the flow, pressure and water quality of the inlet water and the produced water of the EDI processing, thereby realizing automation and intellectualization of the ultrapure water preparation system.
In summary, the ultrapure water preparation system provided by the embodiment of the invention solves the problem of small integration of the ultrapure water preparation system, and realizes miniaturization of the whole set of equipment by optimizing the process and the pipeline layout. In addition, the ultrapure water preparation system provided by the embodiment of the invention can automatically run without being operated by professional staff; and (3) detecting parameters of flow, pressure and water quality on line, and automatically operating the system according to a parameter program. In addition, strong acid and strong alkali are not needed in the preparation process of the ultrapure water, so that the water quality of the ultrapure water is ensured.
On the other hand, the vehicle urea solution preparation system provided by the embodiment of the invention not only realizes intelligent continuous production of the vehicle urea solution, but also improves the quality of the vehicle urea solution by adopting the ultrapure water preparation system.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic view of an ultrapure water production system provided by an embodiment of the present invention as a whole;
FIG. 2 is a schematic view of an ultrapure water production system as a whole according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pre-treatment apparatus provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of a reverse osmosis treatment apparatus provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of an EDI processing apparatus provided by an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Example 1
The embodiment provides an ultrapure water preparation system which is mainly applied to the production of a vehicle urea solution so as to prepare ultrapure water required by the vehicle urea solution production. Specifically, the ultrapure water preparation system in the embodiment comprises a pretreatment device, a reverse osmosis treatment device and an EDI treatment device which are sequentially connected through a pipeline.
Wherein, preprocessing device includes filtering component for carry out primary filter to raw water to detach the granule in raw water, chlorine residue, colloid and microorganism, play the effect of subsequent reverse osmosis treatment device of protection.
The reverse osmosis treatment device is used for performing reverse osmosis treatment on the water subjected to primary filtration to enable the water to meet the water inlet requirement of the EDI treatment device. Wherein, the reverse osmosis treatment device comprises a reverse osmosis treatment unit (the ultrapure water preparation system shown in figure 2 comprises a reverse osmosis treatment unit) or a plurality of reverse osmosis treatment units (the ultrapure water preparation system shown in figure 1 comprises two reverse osmosis treatment units connected in series) arranged in series and parallel (the series and parallel comprises three conditions of all series connection, all parallel connection, parallel connection and series connection). And, each reverse osmosis treatment unit includes one RO reverse osmosis membrane element (the reverse osmosis treatment unit in the ultrapure water production system shown in FIG. 2 includes one RO reverse osmosis membrane element 20) or a plurality of RO reverse osmosis membrane elements arranged in series and parallel (one of the reverse osmosis treatment units in the ultrapure water production system shown in FIG. 1 includes two RO reverse osmosis membrane elements 201 arranged in parallel).
The EDI treatment device is used for carrying out EDI treatment on the water after the reverse osmosis treatment. The EDI processing device comprises a water inlet control unit, a water inlet detection and regulation unit, an EDI processing unit, a water production monitoring unit and an ultrapure water collection unit which are sequentially connected through pipelines. Wherein, the control unit of intaking is used for controlling the intaking of EDI processing apparatus. The water inlet detection and regulation unit is used for regulating the water inlet pressure and the water inlet flow of the fresh water chamber, the concentrated water chamber and the electrode water chamber in the EDI processing unit. The produced water monitoring unit is used for monitoring the quality of the fresh water produced by the EDI processing unit on line. The ultrapure water collection unit is used for collecting the fresh water produced by the EDI treatment unit.
The ultrapure water preparation system provided by the embodiment adopts a brand-new system design, and mainly comprises a pretreatment device, a reverse osmosis treatment device and an EDI treatment device, and the three devices have compact structure and small occupied area, so that the miniaturization of the ultrapure water preparation system is realized. In addition, the ultrapure water preparation system prepares ultrapure water by sequentially carrying out primary filtration, reverse osmosis treatment and EDI treatment on raw water, and strong acid and strong alkali are not needed in the whole process, so that the quality of the ultrapure water is stable.
Example 2
Preferably, this embodiment provides an ultrapure water preparation system, and compared with the previous embodiment, the filter assembly of the pretreatment device in this embodiment comprises one or more of a pre-filter, a cartridge filter (optionally a wire-wound cartridge filter or a melt-blown PP cotton cartridge filter), and an adsorption filter (optionally a granular activated carbon filter or a carbon rod filter). Specifically, the filter assembly of the pretreatment device can increase, decrease and arrange the filter according to the local water quality.
Preferably, as shown in fig. 1 and 3, the filter assembly in the pretreatment device in the present embodiment may be configured as follows: a pre-filter 111, a wire-wound filter element filter 112 (the wire-wound filter element can be replaced by a melt-blown PP cotton filter element), and a granular activated carbon filter 113 (the granular activated carbon filter can be replaced by a carbon rod filter) which are connected in sequence through pipelines. The pre-filter 111 selects a 40 μm self-washing stainless steel mesh pre-filter to filter out silt solid particles or impurities above 40 μm in the raw water. The wire-wound filter element 112 is a 5-core 20-inch 10-micron stainless steel wire-wound filter element for filtering solid particles with a size of more than 10 microns in raw water. The granular activated carbon filter 113 is a 5-core 20-inch 10-micron granular activated carbon filter to adsorb residual chlorine and partial organic matters contained in raw water, so as to ensure that the water entering the reverse osmosis treatment device does not contain residual chlorine (residual chlorine with strong oxidizing property contacts with a reverse osmosis membrane to degrade and destroy a functional layer on the surface of the reverse osmosis membrane).
The prefilter 111, the wire-wound filter element 112, and the granular activated carbon filter 113 may be selected to have the above-mentioned filtration accuracy, or may be selected to have other accuracy depending on the water quality.
Preferably, if the ultrapure water preparation system of the present embodiment is applied to a region with poor water quality, the filter assembly of the present embodiment further comprises an ultrafiltration membrane element 114. Among them, the ultrafiltration membrane element 114 is provided in the upstream line of the reverse osmosis treatment apparatus, preferably in the downstream line of the granular activated carbon filter 113. To further remove particles, colloids, partial organic substances, viruses and microorganisms having a particle size of 0.1 μm or more in the raw water. Preferably, the ultrafiltration membrane element is a PVDF flushable ultrafiltration membrane element. Preferably, the ultrafiltration membrane element 114 is connected with a first flushing pipeline for flushing the ultrafiltration membrane element, and a first flushing control valve 15 is arranged on the first flushing pipeline to control the flushing of the ultrafiltration membrane element 114. Preferably, the first flushing control valve 15 is an electric ball valve, so as to realize automatic control of the flushing of the ultrafiltration membrane assembly 114.
In addition, in the present embodiment, the configuration of the pretreatment device is variable, and whether or not the ultrafiltration membrane element 114 is provided is considered according to the local water quality condition. For example, the ultrafiltration membrane element 114 is not required in areas with good water quality. Here, in an area with good water quality, the installation position of the ultrafiltration membrane element 114 may be advanced, and the prefilter and the wire-wound cartridge filter may be eliminated at the same time, that is, the filter module includes only the ultrafiltration membrane element and the adsorption filter connected in sequence by a pipeline.
In addition, the present embodiment and the following embodiments refer to "upstream" and "downstream" as defined in terms of the flow direction of the water flow.
The device of preliminary treatment that this embodiment provided can well filter silt, granule, colloid, microorganism in former aquatic through carrying out as above configuration to filtering component, plays fine guard action to subsequent reverse osmosis treatment device.
Example 3
Preferably, the embodiment provides an ultrapure water preparation system, and compared with embodiment 2, the pretreatment device of the embodiment further comprises a pressure control assembly, which is mainly used for controlling the water inlet pressure of the pretreatment device and the water inlet pressure of the filter assembly.
Specifically, as shown in fig. 1 and 3, the pressure control assembly includes a pressure reducing valve 121, a pressure sensor 122, a control valve 123, and a pressurizing pump 124. The pressure reducing valve 121 is arranged on an upstream pipeline of the pre-filter 111 and is used for controlling the pressure of raw water entering the pretreatment device not to be larger than a first set value; preferably, the first set value is 0.4 MPa. The pressure sensor 122 is disposed on a pipeline between the pre-filter 111 and the filter 112, and is used for detecting the outlet water pressure of the pre-filter 111. A control valve 123 is provided in the line between the pressure sensor 122 and the wound cartridge filter 112; here, the pressure sensor 122 and the control valve 123 form a low pressure protection mechanism; if the water inlet pressure detected by the pressure sensor is less than the second set value (preferably, the second set value is 0.2MPa), the second control valve 123 is in a closed state, so that the pretreatment device stops working. Preferably, the control valve 123 is an electric ball valve. A booster pump 124 is provided on the line between the second control valve 123 and the wound core filter 112 for boosting the inlet water pressure of the wound core filter 112 to a third set value.
In addition, the pretreatment device further comprises a water inlet control valve 14 and a check valve 13. Wherein, the water inlet control valve 14 is provided on an upstream pipe of the pressure reducing valve 121 for controlling the raw water to be introduced into the pretreatment apparatus. Preferably, the intake control valve 14 is preferably a manual ball valve. The check valve 13 is provided in the upstream line of the pre-filter 111 (preferably, a line between the pressure reducing valve 121 and the pre-filter 111); the check valve 13 is used to prevent air from entering the ultrapure water preparation system, and eliminates the risk of failure due to air entering the system.
This embodiment carries out reasonable layout through the pressure control subassembly to preprocessing device, when carrying out pretreatment efficiency to the raw water, realizes preprocessing device's miniaturization, automation.
The working process that the preprocessing device provided by this embodiment carries out preliminary filtration to the raw water is specifically as follows: qualified municipal tap water raw water meeting the GB5749-2006 standard enters a pretreatment device of an ultrapure water preparation system through an opened manual ball valve 14. The pressure of the raw water entering the pretreatment device is ensured to be not more than 0.4MPa through the action of the pressure reducing valve 121. The check valve 13 ensures that air cannot enter the ultrapure water preparation system from the water inlet of the pretreatment device, and the risk of failure caused by air entering the system is eliminated. The raw water entering the pretreatment device is decompressed by the decompression valve 121, and then is automatically washed by the stainless steel mesh prefilter 111 by 40 μm to remove silt solid particles with the particle size of more than 40 μm (pollutants accumulated on the surface of the filter screen are removed by regular automatic washing). The pressure sensor 122 and the electric ball valve 123 are combined to form a low-pressure protection mechanism, when the water inlet pressure sensed by the pressure sensor 122 is lower than a second set pressure value of 0.2MPa designed by the system, the electric ball valve 123 is closed, and the system stops working. The raw water filtered by the pre-filter 111 is pressurized by a booster pump 124 and then sequentially enters a 5-core 20-inch 10-micron stainless steel wire wound filter element filter 112 and a 5-core 20-inch 10-micron stainless steel granular activated carbon filter 113. Solid particles with the diameter larger than 10 mu m in the water are removed by the wire-wound filter element 112, and residual chlorine and partial organic matters in the water can be adsorbed by the granular activated carbon filter 113, so that the water entering the reverse osmosis treatment unit does not contain residual chlorine. And finally, filtering the raw water filtered by the granular activated carbon filter 113 by a PVDF washable ultrafiltration membrane element 114 to remove particles, colloids, partial organic matters, viruses and microorganisms with the particle size of more than 0.1 mu m. In addition, the membrane surface of the ultrafiltration membrane element 114 is flushed by the first flush control valve 15. When the flux of the ultrafiltration membrane element 114 is attenuated to the extent that the flux can not be recovered to 1t/h after automatic washing, the filter element of the ultrafiltration membrane element is disassembled and manually washed.
Example 4
Preferably, this embodiment provides an ultrapure water preparation system, wherein, compared with embodiment 1, as shown in fig. 2, each reverse osmosis treatment unit of the reverse osmosis treatment apparatus in this embodiment further comprises: pressure flow detection subassembly, pressure flow control assembly and produce water detection subassembly.
Wherein, pressure flow adjusts the subassembly and sets up on pressure flow detection subassembly's upstream pipeline. And, the pressure-flow regulating assembly includes a high-pressure pump 21 and a first regulating valve 22 (wherein the first regulating valve 22 is preferably a manual ball valve). The first regulator valve 22 is provided on a return branch connected in parallel to both ends of the high-pressure pump 21. The water pretreated by the pretreatment device is pressurized by a high-pressure pump 21 to the operating pressure (e.g., 0.8 or 1.6MPa) of the RO reverse osmosis membrane element 20. The flow and pressure can be regulated within a certain range by a first control valve 22 on the return branch in parallel with the high-pressure pump 21.
Wherein, pressure flow detection subassembly, including setting up pressure sensor 23 and the pulse type flowmeter (not shown in the figure) in RO reverse osmosis membrane element 20 upstream pipeline, can carry out on-line monitoring (promptly, control the inflow pressure and the inflow flow of reverse osmosis treatment unit) to the pressure and the flow of high-pressure pump 21 output water, and the system sends when the flow is less than 1t/h and reminds.
The water production detection module is disposed on the downstream line of the RO reverse osmosis membrane element 20. Specifically, the produced water detection assembly comprises a conductivity meter 24 for on-line monitoring of the quality of the produced water of the reverse osmosis membrane treatment unit; the system alerts when the conductivity of the produced water is greater than 40 μmS cm. In addition, the pressure and flow rate of the water produced by the reverse osmosis treatment unit can be monitored on-line by a pressure sensor (not shown) and a pulse-type flow meter 25 disposed on the downstream line of the RO reverse osmosis membrane element.
The ultrapure water preparation system provided by the embodiment realizes the automatic operation of the system, does not need professional personnel to operate, and realizes the online detection of flow, pressure and water quality parameters by setting the reverse osmosis treatment unit.
Example 5
Preferably, this embodiment provides an ultrapure water production system, in which, as compared with embodiment 4, each reverse osmosis treatment unit of the reverse osmosis treatment apparatus in this embodiment further comprises a concentrated water discharge unit, as shown in fig. 2. Specifically, the concentrate discharge assembly includes a concentrate discharge line and a second flush line. Wherein the concentrated water discharge line is connected to the concentrated water discharge port of the RO reverse osmosis membrane element 20. The concentrated water discharge line is provided with a pressure sensor 26, a concentrated water discharge control valve 27, and a flow meter 28 (preferably, a pulse-type flow meter). Wherein the pressure and flow rate of the discharged concentrated water are monitored on-line by the pressure sensor 26 and the flow meter 28. A second flush line is connected to the concentrate discharge of the RO reverse osmosis membrane element 20 and a second flush control valve 29 is provided on the second flush line to control flushing of the RO reverse osmosis membrane element. The second flush control valve 29 is preferably a solenoid valve. The RO reverse osmosis membrane element 20 is flushed by the solenoid valve 29 in a forced flushing setting at each start-up or after one hour of continuous operation.
Example 6
Preferably, this embodiment provides an ultrapure water preparation system, compared with embodiment 5, the reverse osmosis treatment apparatus in this embodiment comprises two reverse osmosis treatment units, namely a first reverse osmosis treatment unit and a second reverse osmosis treatment unit, which are arranged in series. Wherein, the first-stage reverse osmosis treatment unit is used for carrying out first-stage reverse osmosis treatment on the water after the primary filtration of the pretreatment device. The secondary reverse osmosis treatment unit carries out secondary reverse osmosis treatment on the water subjected to the primary reverse osmosis treatment.
As shown in fig. 1 and 4, the primary reverse osmosis treatment unit includes two primary RO reverse osmosis membrane elements 201 arranged in parallel. The water pretreated by the pretreatment device is pressurized to the working pressure (e.g., 0.6 or 1.6MPa) of the first RO reverse osmosis membrane element 201 by the first high pressure pump 211. The pressure and flow rate of the water entering the primary reverse osmosis treatment unit can be adjusted within a certain range by a first adjusting valve 221 (preferably a manual ball valve) on the return branch connected in parallel with the primary high-pressure pump 211. The pressure sensor 231 and the pulse type flowmeter can monitor the water output by the first-stage high-pressure pump 211 on line, and when the flow rate is less than 1t/h, the system sends out a prompt. The water pressurized by the first-stage high-pressure pump 211 respectively enters 2 first-stage RO reverse osmosis membrane elements 201 for purification. The pure/concentrated water recovery rate can be adjusted by the concentrated water discharge control valve 271 according to the local water quality conditions, and the recovery rate of the first-stage RO reverse osmosis membrane element is generally set at 30-50%. The pressure and flow rate of the concentrated water discharge are detected on line by the pressure sensor 261 and the flow meter 281. And the two primary RO reverse osmosis membrane elements 201 are flushed by controlling the second flushing control valve 291 on the second flushing pipeline every time the machine is started or continuously runs for 1 hour. The flow rate of the produced water of the first-stage RO reverse osmosis membrane element 201 is detected on line by a flow meter 251, the quality of the produced water is monitored on line by a conductivity meter 241, and when the quality of the produced water is more than 40 mu S-cm, the system gives a prompt.
The secondary reverse osmosis treatment unit includes a secondary RO reverse osmosis membrane element 202. The produced water from the primary reverse osmosis treatment unit is pressurized in a secondary high pressure pump 212 to the working pressure (e.g., 0.6 or 1.6MPa) of the secondary RO reverse osmosis membrane element 202. Flow and pressure may be regulated over a range by a manual ball valve 222 on the return branch in parallel with secondary high pressure pump 212. The water pressurized by the secondary high pressure pump 212 enters the secondary RO reverse osmosis membrane element 202 for purification. The pure/concentrate recovery rate can be adjusted by the concentrate discharge control valve 272 according to local water quality conditions, and the recovery rate of the secondary RO reverse osmosis membrane element is generally set at 40-90%. The pressure sensor 262 and the flow meter 282 detect the discharge pressure and flow rate of the concentrated water on line. And the flushing of the second-stage RO reverse osmosis membrane element 202 is achieved by controlling the second flush control valve 292 on the second flush line for 1 hour each time the system is turned on or continuously operated. The flow rate of the produced water of the second-stage RO reverse osmosis membrane element 202 is detected on line by a flow meter 252, the quality of the produced water is monitored on line by a conductivity meter 242, and when the quality of the produced water is more than 20 muS-cm, the system gives a prompt.
In addition, the reverse osmosis treatment device further comprises a first water discharge pipeline 51, and the concentrated water discharge pipeline and the second flushing pipeline of the reverse osmosis treatment unit are connected to the first water discharge pipeline 51. Preferably, the first flushing line in the pre-treatment device is also in communication with the first drain line 51. Preferably, an exhaust valve 511 is further provided at the highest position of the first exhaust pipe 51 to exhaust gas accumulated in the first exhaust pipe and prevent the generation of back pressure.
Preferably, the concentrated water discharge pipeline of the second stage reverse osmosis treatment unit is further provided with a check valve 290 for preventing the concentrated water discharged from the first stage reverse osmosis treatment unit from affecting the discharge of the concentrated water from the second stage reverse osmosis treatment unit.
Example 7
Preferably, this embodiment provides an ultrapure water production system, in contrast to the above-described embodiment, as shown in FIG. 2, the reverse osmosis treatment apparatus of this embodiment comprises only one reverse osmosis treatment unit, and the reverse osmosis treatment unit comprises one RO reverse osmosis membrane element 20. The reverse osmosis treatment device in the embodiment is suitable for areas with better water quality. The working process is described in embodiment 6, and details are not repeated here.
The reverse osmosis treatment device provided by the embodiment is provided with one reverse osmosis treatment unit or a plurality of reverse osmosis treatment units connected in series according to local water quality, and each reverse osmosis treatment unit is provided with one or a plurality of RO reverse osmosis membrane elements connected in series, a pressure flow rate detection component, a pressure flow rate regulation component, a produced water detection component and a concentrated water discharge component. Through the arrangement, the reverse osmosis effect of the reverse osmosis device is improved, the flow, pressure and water quality of inlet water and produced water of reverse osmosis treatment are monitored and adjusted on line, and automation and intellectualization of an ultrapure water preparation system are realized.
Example 8
Preferably, the present embodiment provides an ultrapure water preparation system, compared with the above embodiments, as shown in fig. 1, fig. 2 and fig. 4, the ultrapure water preparation system in the present embodiment further comprises an intermediate water tank 3. Wherein, the middle water tank 3 is arranged on a downstream pipeline of the reverse osmosis treatment device and an upstream pipeline of the EDI treatment device and is used for collecting the produced water of the reverse osmosis treatment device. As shown in fig. 1 and 4, an intermediate water tank 3 is provided on a downstream line of the secondary reverse osmosis treatment unit.
Preferably, a liquid level control device for controlling the set liquid level of the intermediate water tank is arranged in the intermediate water tank 3, and the intermediate water tank is strictly sealed; wherein, it has four points (4 liquid level control points) to set for the liquid level, reserves the highest liquid level control point (i.e. the reservation highest water level of middle water tank) and is insurance water level control point, should reserve the high water level and not contact water at ordinary times, when the highest water level control became invalid, reserves the high water level and plays the effect that prevents middle water tank and take place the overflow. The top of the middle water tank 3 is provided with a breather 31 for discharging redundant gas and ensuring that external solid particles cannot enter the middle water tank.
The lower end of the middle water tank 3 is provided with a water outlet pipeline which is provided with a water outlet control valve 32 and is used for controlling the water outlet of the middle water tank 3; preferably, the outlet control valve 32 is preferably a manual ball valve. In addition, the free end of the outlet pipe is also provided with a reserved outlet 33. Preferably, the water inlet of the intermediate water tank 3 is arranged at the bottom of the water tank 3.
Example 9
Preferably, in this embodiment, compared with the above embodiments, as shown in fig. 1 and 5, the water inlet control unit in the EDI processing apparatus in this embodiment comprises: a water inlet pipeline, and an EDI booster pump 412 and a water inlet control valve 411 (wherein, the water inlet control valve 411 is preferably an electric ball valve) arranged on the water inlet pipeline. The upstream side of the water inlet pipeline is communicated with the middle water tank 3, and the downstream side of the water inlet pipeline is connected with the water inlet detection and regulation unit.
Preferably, the water inlet control unit further comprises a backflow branch connected with the water inlet pipeline in parallel, and the downstream end of the backflow branch is connected with the intermediate water tank 3; a second regulating valve 413 is disposed in the return branch (wherein the second regulating valve 413 is preferably a manual ball valve) for regulating the inlet pressure and flow of the inlet line within a certain range. If the return branch is connected to the lower end of the intermediate tank 3, a check valve is required to be disposed on the return branch.
Preferably, the incoming water EDI processing unit in this embodiment includes a fresh water chamber and a concentrate chamber. Or the EDI processing unit comprises a fresh water chamber, a concentrated water chamber and an electrode water chamber.
Preferably, the water inlet detection and adjustment unit in this embodiment includes a first branch and a second branch that are arranged in parallel. Wherein, the upstream ends of the first branch and the second branch are connected with the downstream end of the water inlet control unit. The downstream end of the first branch is connected with an inlet of the fresh water chamber; the first branch is provided with a pressure sensor 421, a flow meter and a water inlet regulating valve 422 (preferably a needle-shaped stop valve) for detecting and regulating the water inlet pressure and the water inlet flow of the fresh water chamber. The downstream end of the second branch is connected with the inlet of the concentrated water chamber, and a pressure sensor 423, a flow meter 424 and a water inlet regulating valve 425 (preferably a needle-shaped stop valve) are arranged on the second branch and are used for detecting and regulating the pressure and the flow of the inlet water of the concentrated water chamber. When the EDI processing unit further comprises an electrode water chamber, the water inlet detection regulating unit of the EDI processing device further comprises a third branch which is connected with the first branch and the second branch in parallel; the upstream ends of the third branches are connected with the downstream end of the water inlet control unit; the downstream end of the third branch is connected with the inlet of the polar water chamber, and the third branch is provided with a pressure sensor 426, a flow meter 427 and a water inlet regulating valve 428 (preferably a needle-shaped stop valve) for detecting and regulating the pressure and flow of the inlet water of the polar water chamber. Preferably, the water inlet flow of the fresh water chamber in the embodiment is controlled at 80-120L/h; the water inlet flow of the concentrated water chamber is controlled to be 12-18L/h; the water inlet flow of the water electrode chamber is controlled to be 3-5L/h.
Preferably, the EDI processing apparatus in the present embodiment further includes a power supply for supplying electric power to the EDI processing unit, wherein the operating voltage is in a range of 50 to 100V; the current is 0.2-0.3A.
Preferably, the EDI water production online monitoring unit includes a resistivity meter 442 connected to the outlet line of the fresh water chamber. Wherein, when the resistivity is lower than 2M omega cm, the system gives a prompt. The EDI water production online monitoring unit further comprises a flowmeter 441 connected to the fresh water chamber water outlet pipeline and used for detecting the flow of EDI water production.
Preferably, the ultrapure water collection unit comprises an ultrapure water collection tank 45, and the ultrapure water collection tank 45 is connected to the water outlet pipeline of the fresh water chamber and is used for collecting the fresh water generated by the EDI module. Preferably, the ultrapure water collection tank 45 is provided with a breather 451 to achieve pressure equalization inside the ultrapure water collection tank 45 and to ensure that foreign substances cannot enter the tank. Preferably, a liquid level control device is further disposed on the ultrapure water collecting tank 45 to control the liquid level of the ultrapure water collecting tank (here, the function of the liquid level control device on the ultrapure water collecting tank 45 can be referred to the liquid level control device on the intermediate water tank in embodiment 8, and the detailed description is omitted here). Preferably, the ultrapure water collecting tank is provided at a lower end thereof with a pipeline 454 for connecting a stirring process (wherein the pipeline 454 is used for connecting a stirring tank in a vehicle urea solution preparation system, see embodiment 10 in detail), and an outlet pipeline, wherein the outlet pipeline is provided with an outlet control valve 452, and an end of the outlet pipeline is provided with a reserved drain 453.
Preferably, the EDI processing apparatus in this embodiment further includes an EDI drain line 52 for connecting the concentrate chamber and the electrode chamber in the EDI module.
Preferably, a control valve 414 is further disposed on the pipeline between the water inlet detection and adjustment unit and the water inlet control unit, and the control valve 414 is preferably a stainless steel needle valve.
The EDI processing apparatus that this embodiment provided has improved EDI treatment effect through above-mentioned setting, still realizes that the inflow of anti-EDI processing, the flow of producing water, pressure and quality of water carry out on-line monitoring promptly and adjust, has realized the automation, the intellectuality of ultrapure water preparation system.
Preferably, in the case that the carbon dioxide in the water affects the quality of the effluent, the pretreatment device in the above embodiment may be further provided with a degassing device to remove the carbon dioxide, so as to ensure the quality of the ultrapure water. Under the condition of requiring higher effluent quality (such as 18M omega cm), a polishing resin unit can be additionally arranged behind the EDI treatment device for further purification, and compared with the common process, the volume of the additionally arranged polishing resin unit is greatly reduced.
Preferably, the highest position of the pipeline in the ultrapure water preparation system provided in the above embodiment is provided with an exhaust valve to protect the pipeline and ensure the water quality of the ultrapure water.
In summary, the ultrapure water preparation system provided by the embodiment of the invention solves the problem of miniaturization and integration of the ultrapure water preparation system, and realizes miniaturization of the whole set of equipment by optimizing the process and the pipeline layout. In addition, the ultrapure water preparation system provided by the embodiment can automatically run without operation of professional staff; and (3) detecting parameters of flow, pressure and water quality on line, and automatically operating the system according to a parameter program. In addition, strong acid and strong alkali are not needed in the preparation process of the ultrapure water, so that the water quality of the ultrapure water is ensured.
Example 10
In another aspect, the present embodiment provides a urea solution preparation system for a vehicle, wherein the urea solution preparation system for a vehicle includes the ultrapure water preparation system of any one of the above embodiments.
Preferably, the system for preparing a vehicle urea solution in this embodiment further includes an agitator tank having an ultrapure water inlet, a urea particle inlet, and a vehicle urea solution outlet. Wherein, the ultrapure water inlet is connected with an ultrapure water collecting water tank in the ultrapure water preparation system.
The vehicle urea solution preparation system provided by the embodiment not only realizes intelligent continuous production of the vehicle urea solution, but also improves the quality of the vehicle urea solution by adopting the ultrapure water preparation system provided by the embodiment.
From the foregoing, it will be readily appreciated by those skilled in the art that the advantageous modes described above can be freely combined, superimposed, without conflict.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (23)

1. An ultrapure water preparation system is characterized by comprising a pretreatment device, a reverse osmosis treatment device and an EDI treatment device which are sequentially connected through pipelines; wherein,
the pretreatment device comprises a filtering component for primary filtering of raw water;
the reverse osmosis treatment device is used for performing reverse osmosis treatment on the water after the primary filtration; wherein the reverse osmosis treatment device comprises a reverse osmosis treatment unit or a plurality of reverse osmosis treatment units which are arranged in series and parallel; and each of the reverse osmosis treatment units comprises one RO reverse osmosis membrane element or a plurality of RO reverse osmosis membrane elements;
the EDI treatment device is used for carrying out EDI treatment on the water subjected to reverse osmosis treatment; the EDI treatment device comprises a water inlet control unit, a water inlet detection and regulation unit, an EDI treatment unit, a water production monitoring unit and an ultrapure water collection unit which are sequentially connected through pipelines.
2. The ultrapure water preparation system of claim 1 wherein the filter assembly comprises one or more of a pre-filter, a cartridge filter, and an adsorption filter;
wherein, the filter element filter is a wire-wound filter element filter or a melt-blown PP cotton filter element filter;
the adsorption filter is a granular activated carbon filter or a carbon rod filter.
3. The ultrapure water production system according to claim 2,
the pre-filter is a stainless steel mesh pre-filter with the particle size of 40 mu m or more in the raw water;
the wire-wound filter element filter is a stainless steel wire-wound filter element filter with the diameter of 10 mu m, so as to filter out particles with the diameter of more than 10 mu m in raw water;
the granular activated carbon filter is 10 mu m to adsorb residual chlorine contained in raw water.
4. The ultrapure water production system of claim 2 or 3 wherein the filtration assembly further comprises an ultrafiltration membrane element; wherein the ultrafiltration membrane element is arranged on an upstream pipeline of the reverse osmosis treatment device.
5. The system for producing ultrapure water as recited in claim 4 wherein the ultrafiltration membrane elements are selected from the group consisting of cleanable PVDF ultrafiltration membrane elements.
6. The ultrapure water production system of claim 5 wherein the ultrafiltration membrane element is connected with a first flushing line for flushing the ultrafiltration membrane element; wherein, be provided with first washing control valve on the first washing pipeline to control the washing of ultrafiltration membrane element.
7. The ultrapure water preparation system of claim 2, wherein the pretreatment device further comprises a pressure control assembly, wherein the pressure control assembly comprises:
the pressure reducing valve is arranged on an upstream pipeline of the pre-filter and is used for controlling the pressure of raw water entering the pretreatment device to be not more than a first set value;
the pressure sensor is arranged on a pipeline between the pre-filter and the wound filter element filter and is used for detecting the water outlet pressure of the pre-filter;
the control valve is arranged on a pipeline between the pressure sensor and the wound filter element filter; if the effluent pressure detected by the pressure sensor is less than a second set value, the control valve is in a closed state, and the pretreatment device stops working;
and the booster pump is arranged on a pipeline between the control valve and the winding filter element filter and used for boosting the water inlet pressure of the winding filter element filter to a third set value.
8. The ultrapure water production system of claim 7 wherein the pretreatment device further comprises a water inlet control valve and a check valve; wherein,
the water inlet control valve is arranged on an upstream pipeline of the pressure reducing valve and is used for controlling raw water to enter the pretreatment device;
the check valve is arranged on a pipeline between the pressure reducing valve and the pre-filter and used for preventing air from entering the ultrapure water preparation system.
9. The ultrapure water preparation system of claim 1, wherein each of the reverse osmosis treatment units further comprises:
the pressure flow detection assembly is arranged on an upstream pipeline of the RO reverse osmosis membrane element and is used for detecting the water inlet pressure and the water inlet flow of the reverse osmosis treatment unit;
the pressure flow regulating assembly is arranged on an upstream pipeline of the water inlet pressure detecting assembly and is used for regulating the water inlet pressure and the water inlet flow of the reverse osmosis treatment unit;
and the water production detection assembly is arranged on a downstream pipeline of the RO reverse osmosis membrane element and used for detecting the quality of the produced water of the reverse osmosis treatment unit.
10. The ultrapure water production system according to claim 9,
the pressure flow detection assembly comprises a pressure sensor and a flowmeter;
the pressure and flow regulating assembly comprises a high-pressure pump and a first regulating valve; wherein the high-pressure pump is arranged on an upstream pipeline of the pressure flow detection assembly; the first regulating valve is arranged on a backflow branch which is connected with two ends of the high-pressure pump in parallel;
the water production detection assembly comprises a conductivity meter for detecting the quality of water produced by the reverse osmosis treatment unit.
11. The ultrapure water production system of claim 1 wherein each of the reverse osmosis treatment units further comprises a concentrate discharge assembly; wherein the concentrated water discharge assembly includes:
the concentrated water discharge pipeline is connected with a concentrated water discharge port of the RO reverse osmosis membrane element; a concentrated water discharge control valve for controlling the discharge of concentrated water, a pressure sensor for detecting the discharge pressure of concentrated water and a flowmeter for detecting the discharge flow of concentrated water are arranged on the concentrated water discharge pipeline;
the second flushing pipeline is connected with a concentrated water discharge port of the RO reverse osmosis membrane element; and a second flushing control valve is arranged on the second flushing pipeline to control the flushing of the RO reverse osmosis membrane element.
12. The system for producing ultrapure water according to any one of claims 9 to 11, wherein the reverse osmosis treatment apparatus comprises two reverse osmosis treatment units disposed in series, a primary reverse osmosis treatment unit and a secondary reverse osmosis treatment unit, respectively; wherein,
the primary reverse osmosis treatment unit is used for performing primary reverse osmosis treatment on the water preliminarily filtered by the pretreatment device; the primary reverse osmosis treatment unit comprises two RO reverse osmosis membrane elements which are arranged in parallel;
the secondary reverse osmosis treatment unit is used for carrying out secondary reverse osmosis treatment on the water subjected to the primary reverse osmosis treatment; wherein the secondary reverse osmosis treatment unit comprises an RO reverse osmosis membrane element.
13. The system for preparing ultrapure water according to any one of claims 9 to 11, wherein the reverse osmosis treatment apparatus comprises a reverse osmosis treatment unit comprising an RO reverse osmosis membrane element.
14. The system for preparing ultrapure water according to claim 12, wherein when the reverse osmosis treatment unit comprises a concentrate discharge unit, a check valve is further provided on the concentrate discharge line of the secondary reverse osmosis treatment unit.
15. The ultrapure water preparation system of claim 1, further comprising an intermediate water tank; wherein, the middle water tank is arranged on a downstream pipeline of the reverse osmosis treatment device and an upstream pipeline of the EDI treatment device and is used for collecting the produced water of the reverse osmosis treatment device.
16. The ultrapure water production system of claim 15 wherein the intermediate tank is provided with a liquid level control means for controlling a set liquid level of the intermediate tank; the set liquid level comprises a reserved highest water level and is used for preventing the intermediate water tank from overflowing when a highest water level control point of the intermediate water tank fails;
the middle water tank is also provided with a respirator for realizing the balance of the internal pressure of the middle water tank and ensuring that external solid particles cannot enter the middle water tank.
17. The ultrapure water production system according to claim 15, wherein the water inflow control unit in the EDI processing apparatus comprises: the water inlet pipeline, and an EDI booster pump and a water inlet control valve which are arranged on the water inlet pipeline; wherein the upstream end of the water inlet pipeline is communicated with the intermediate water tank; and the downstream end of the water inlet pipeline is communicated with the water inlet detection and regulation unit.
18. The system of claim 17, wherein the water inlet control unit further comprises a return branch connected in parallel with the water inlet line; the downstream end of the return branch is connected with the intermediate water tank; and a second regulating valve is arranged on the backflow branch and used for regulating the water inlet pressure and the water inlet flow of the EDI treatment device.
19. The ultrapure water production system of claim 1, wherein the EDI processing unit comprises a fresh water chamber and a concentrated water chamber; or the EDI processing unit comprises a fresh water chamber, a concentrated water chamber and an electrode water chamber.
20. The ultrapure water production system of claim 18, wherein the water inflow detection regulating unit of the EDI treatment apparatus comprises a first branch and a second branch arranged in parallel;
the upstream ends of the first branch and the second branch are connected with the downstream end of the water inlet control unit;
the downstream end of the first branch is connected with the inlet of the fresh water chamber; the first branch is provided with a pressure sensor and a water inlet regulating valve and is used for detecting the water inlet pressure of the fresh water chamber and regulating the water inlet pressure and the water inlet flow of the fresh water chamber;
the downstream end of the second branch is connected with an inlet of the concentrated water chamber; the second branch is provided with a pressure sensor, a flowmeter and a water inlet regulating valve and is used for detecting and regulating the water inlet pressure and the water inlet flow of the concentrated water chamber;
when the EDI processing unit further comprises an electrode water chamber, the water inlet detection regulating unit of the EDI processing device further comprises a third branch which is connected with the first branch and the second branch in parallel; wherein,
the upstream end of the third branch is connected with the downstream end of the water inlet control unit; the downstream end of the third branch is connected with the inlet of the pole water chamber, and the third branch is provided with a pressure sensor, a flowmeter and a water inlet regulating valve and is used for detecting and regulating the water inlet pressure and the water inlet flow of the pole water chamber.
21. The ultrapure water preparation system of claim 19, wherein the water production monitoring unit of the EDI processing apparatus comprises an electrical resistivity meter disposed on the water outlet line of the fresh water chamber.
22. The system according to claim 19, wherein the ultrapure water collection unit comprises an ultrapure water collection tank, and the ultrapure water collection tank is connected with the water outlet pipeline of the fresh water chamber and used for collecting fresh water produced by the EDI processing unit.
23. A urea solution preparation system for vehicles, characterized by comprising the ultrapure water preparation system of any one of claims 1 to 22.
CN201610216843.4A 2016-04-08 2016-04-08 Ultrapure water preparation system and urea solution preparation system for vehicles Pending CN105692973A (en)

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Application publication date: 20160622