CN108726636A - A kind of method and system of membrane distillation processing waste water - Google Patents
A kind of method and system of membrane distillation processing waste water Download PDFInfo
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- CN108726636A CN108726636A CN201810563283.9A CN201810563283A CN108726636A CN 108726636 A CN108726636 A CN 108726636A CN 201810563283 A CN201810563283 A CN 201810563283A CN 108726636 A CN108726636 A CN 108726636A
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/447—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by membrane distillation
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Abstract
The present invention provides the method and systems that a kind of membrane distillation handles waste water, which includes the feed well for storing pending waste water；For being pre-processed to waste water, the suspended matter in waste water, the pretreatment unit pretreated waste water being fed through in heating unit are retained；Heating unit for heated waste water；For the waste water after membrane distillation processing heating；Pressure difference for improving membrane module cold side end and hot side end both ends, and then the flux of membrane module is improved, convenient for the vacuum subassembly of the large-scale application of wastewater treatment, the present invention maintains cold side vacuum by vacuum pump, improves membrane flux；Level-one is arranged to pre-process, improves stable system performance, it can be with long-time steady operation；Recuperative heat exchanger is set, improves waste heat and receives；Recycle cooling water, using water wisely.
Description
Technical field
The present invention relates to a kind of technical field of waste water processing of nuclear power plant, more particularly to a kind of to handle waste water using membrane distillation
Method and system.
Background technology
Currently, both at home and abroad processing waste water conventional method it is very much, mainly include coagulative precipitation, ion exchange, evaporation and concentration with
And the technical methods such as UF membrane.In these above-mentioned methods, coagulative precipitation dirt-removing power is not high, is unable in depth removal waste water
Impurity and ion；Ion-exchange uses ion exchange resin, and when waste liquid ions content is higher, resin is saturated quickly,
Resin bed can be penetrated and be failed.Evaporation and concentration energy consumption is big, and operating cost is higher；There is also equipment corrosion and scalings etc. at runtime
Potential threat.Membrane separation technique is divided into ultrafiltration (UF), reverse osmosis (RO), micro-filtration, electrodialysis, anion exchange paper membrane and support liquid
Embrane method is currently used mainstream membrane technology, but micro-filtration, nanofiltration, the chemical pretreatment program of ultrafiltration are complicated；Conventional press mold
The shortcomings of technology has fouling membrane, Membrane cleaning to be also easy to produce secondary pollution, and operating pressure is high；There is also membrane fluxs for conventional film distillation technology
Small, the shortcomings of stability is poor.
So wastewater treatment method used in the prior art has a large amount of secondary wastes and needs to regenerate, coagulative precipitation
Dirt-removing power is not high, the impurity and ion being unable in depth removal waste water, and that there are membrane fluxs is low, unstable when system performance is run
Fixed problem can not achieve " nearly zero " discharge.
Invention content
The present invention needs to regenerate for will produce a large amount of secondary wastes in existing conventional waste water processing method；Coagulative precipitation
Dirt-removing power is not high, and membrane flux is low, and system performance problem unstable when running provides a kind of flux improving membrane module,
The method and system of waste water is handled convenient for the membrane distillation of the large-scale application of wastewater treatment.
The technical solution that the present invention is proposed with regard to above-mentioned technical problem is as follows：
On the one hand, the present invention provides a kind of membrane distillation handle waste water system, the system comprises：
Feed well, for storing pending waste water；
Heating unit is connected on the outgoing route of feed well, is used for heated waste water；
Membrane module is connect with heating unit, for the waste water after membrane distillation processing heating；
Pretreatment unit is connected between feed well and heating unit, for being pre-processed to waste water, is retained in waste water
Suspended matter, pretreated waste water is fed through in heating unit；
Vacuum subassembly is connected to the cold side end of membrane module, the pressure difference for improving membrane module cold side end and hot side end both ends,
And then the flux of membrane module is improved, it is convenient for the large-scale application of wastewater treatment.
Further include the first circulation being connect with feed well according to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water
Channel and second circulation channel, the inlet at one end connection membrane module hot side end in the first circulation channel, described second follows
The other end in the exit at one end connection membrane module hot side end in ring channel, the first circulation channel and second circulation channel is total
With connection feed well entrance；
Isolating valve is arranged on the second circulation channel path, in normal operation, opens isolating valve, will be through
Waste water after the membrane module concentration, which is delivered to by the second circulation channel in the feed well, carries out circular treatment；
By-passing valve is arranged on the first circulation channel path, in startup stage, the second circulation channel to be closed
When closing, so that the first circulation channel is opened, the waste water in feed well is stirred and heated, reduces the impurity in feed well
Precipitation.
A kind of system of the above-mentioned membrane distillation processing waste water of the present invention further includes：
Delivery pump is connected on the transport path between pretreatment unit and feed well, is used for feed well waste water supercharging
And it is delivered to the pretreatment unit；
Regulating valve is arranged between the heating unit and membrane module on pipeline, for adjusting the wastewater flow in pipeline；
Control unit controllably connects delivery pump, regulating valve, heating unit, vacuum subassembly, for according to difference respectively
Input instruction, control the waste water of feed well being delivered in the pretreatment unit respectively and pre-process, it is defeated belonging to control
Pump feed flow is sent, the heating unit is controlled and preset temperature is heated to waste water, and control vacuum subassembly to the cold of membrane module
Side vacuumizes, to improve the pressure difference at membrane module cold side end and hot side end both ends.
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, setting the heating unit and membrane module it
Between on pipeline and along the flowmeter that transport path is set gradually, thermometer and conductivity meter described control unit also respectively with
The flowmeter, thermometer and conductivity meter connection；
Described control unit is for receiving the flowmeter, the actual flow signal of thermometer and conductivity meter, temperature letter
Number and conductivity signal, and with the preset flow value inside described control unit, preset temperature value and default conductivity value carry out
Compare, and controls the flow for adjusting valve regulation waste water according to comparison result and control the heating unit and adjust adding for waste water
Hot temperature.
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, vacuum subassembly includes：Vacuum meter is arranged in institute
It states on membrane module cold side end pipe line and is connect with control unit, the vacuum degree signal for monitoring membrane module cold side end in real time will
The vacuum degree signal is sent to control unit；
Condenser is connect with membrane module cold side end, is distillated for membrane module cold side end distillate gas to be condensed into
Liquid,
Vacuum pump is connect with the condenser, the negative pressure value for keeping membrane module cold side end；
Described control unit is also connected with the vacuum meter, for receiving the vacuum degree signal, and with predetermined vacuum angle value
It is compared, the working condition of the vacuum pump is controlled according to comparison result.
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, further includes air cooling tower, be arranged in condenser
Top, for being cooled down to the condenser；
Liquid case is distillated, is connect with the condenser, for collecting the distillate；
Liquid level gauge is connect with the liquid case that distillates, for monitoring the work liquid level for distillating liquid case；
Described control unit is additionally operable to the work liquid level signal for distillating liquid case monitored according to the liquid level gauge of reception, and with it is pre-
If highest distillates liquid case, level value compares, if actually distillating liquid case level value reaches default highest preset value, it is single to suspend heating
Member, membrane module and vacuum pump；
Conductivity meter, setting the condenser and it is described distillate between liquid case on pipeline, and connect described control unit,
For monitoring distillate conductivity signal on-line；Described control unit is additionally operable to the distillate conductivity signal according to reception, if
Judge that distillate is not up to standard requirement, sends out alarm signal.
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, control unit includes memory module, receives mould
Block and comparison module；
The memory module is used to pre-establish the relation table between membrane module flux and multiple parameters, the multiple parameter
Including flowing through the liquid flow magnitude in pipeline, the heating temperature value of heating unit, feed well and the liquid level gauge sum for distillating liquid bath
Level value, vacuum pump vacuumize the conductivity value of the conductivity meter sum of value and membrane module inlet and outlet；
For the receiving module for receiving the actual numerical value detected in real time, the numerical value includes the liquid flowed through in pipeline
Flow value, feed well and the level value for distillating liquid bath, the heating temperature value of heating unit, vacuum pump vacuumize value and film group
Part imports and exports conductivity value；
The comparison module is used to, according to the parameter signal detected, calculate the deviation of actual measured value and preset value, by
This deviation real-time control and adjusts heating unit, regulating valve, true according to the correlation between preset multi-parameter in memory module
The start and stop and adjusting of the equipment such as sky pump, maintain measured value consistent with preset value；
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, monitoring is additionally provided in the feed well
The liquid level gauge of liquid level, described control unit are connected with the liquid level gauge, for receiving work liquid level signal, and with default feed well
Level value compares；When detecting that liquid level reaches highest work liquid level in the feed well, control stops the feed well water inlet,
Or when detecting that liquid level is less than minimum work liquid level in the feed well, suspend membrane distillation unit, the membrane distillation unit
Include the membrane module of multigroup parallel connection.
According to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water, the quantity of the membrane module is according to processing flow
It determines.
Further include moveable cabinet, the cabinet according to the system that a kind of above-mentioned membrane distillation of the present invention handles waste water
On offer：
Water inlet is connect with the import of feed well, is used for external waste water；
Concentrated solution outlet is connect with the outlet of feed well, for concentrate to be discharged；
Water outlet is connect with liquid case is distillated, for distillate to be discharged；
Feed well, liquid level gauge, delivery pump, pretreatment unit, heating unit, membrane module, vacuum subassembly, flowmeter are adjusted
Valve, thermometer, conductivity meter, isolating valve, by-passing valve, conductivity meter distillate liquid case, liquid level gauge, and control unit is arranged in cabinet
It is interior.
On the other hand, the present invention also provides a kind of membrane distillations to handle method for waste water, and waste water is handled using above-mentioned membrane distillation
System handles waste water, including following processing step：
S100, pending waste water is imported into feed well；
S200, waste water is pre-processed by pretreatment unit, retains the suspended matter in waste water, it will be pretreated useless
Water is fed through in heating unit and is heated；
Waste water after S300, heating, which is delivered in membrane module, carries out membrane distillation, by being connected to the true of membrane module cold side end
Empty component vacuumizes it, improves the pressure difference at membrane module cold side end and hot side end both ends, improves the flux of membrane distillation.
In the above-mentioned membrane distillation processing method for waste water of the present invention,
Further include following steps before S200 steps：
System start-up phase closes isolating valve, opens by-passing valve, waste water is made to be returned by first circulation channel before membrane distillation
Back into hopper to mix the waste water of material feeding box.
The above-mentioned membrane distillation of the present invention handles method for waste water：
Concentration waste water after S301, membrane distillation returns to feed well by opening the second circulation channel of isolating valve；
S400, the vapor after membrane distillation is condensed, the cooling water needed for condenser is responsible for cooling simultaneously by air cooling tower
It recycles；
The conductivity of distillate, distillate is collected distillating liquid case after S500, conductivity meter on-line monitoring condensation.
What technical solution provided in an embodiment of the present invention was brought has the technical effect that：
By increasing pretreatment unit and vacuum subassembly in original processing system, realization pre-processes waste water,
The suspended matter in waste water is retained, the pressure difference at membrane module cold side end and hot side end both ends is improved by vacuum subassembly, and then improve film
The flux of component can further decrease the volume of waste water compared with general wastewater treatment method, improve effluent quality, be convenient for
The large-scale application of wastewater treatment.Waste water volume reduction, wastewater treatment large-scale application in terms of have apparent advantage.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the system for membrane distillation processing waste water that the embodiment of the present invention one provides.
Fig. 2 is a kind of control system schematic diagram for membrane distillation processing waste water that the embodiment of the present invention one provides.
Fig. 3 is a kind of flow chart of the method for membrane distillation processing waste water that the embodiment of the present invention one provides.
Specific implementation mode
In order to solve in conventional waste water processing method existing in the prior art, coagulating sedimentation inefficiency；Ion is handed over
It is low and generate a large amount of secondary wastes and need to regenerate to change method applicability；Conventional evaporation concentration method energy consumption is larger, and operating cost is high, sets
Standby suitable corrosion and scaling；Routine has press mold technology to have fouling membrane, Membrane cleaning to be also easy to produce secondary pollution, and operating pressure is high；Conventional film steams
Technology is evaporated there are membrane fluxs the problems such as too small, performance is unstable, the present invention is intended to provide one kind improving film distillation technology useless
High-performance, high stability in water process and high economy reduce the membrane distillation wastewater treatment to the performance requirement of membrane material
Method and system, core concept are：It is proposed that one kind includes maintaining cold side vacuum to carry out by vacuum subassembly pending waste water
The membrane module of membrane distillation processing carries out pretreated pretreatment unit to pending waste water, is heated to pending waste water
The waste water treatment system of heating unit.In waste water treatment system of the present invention, the pending waste water for being stored in feed well is conveying
The pretreatment of the wherein solid impurities such as suspended matter, pretreated waste water can be removed under the action of pump by pretreatment unit
Carrying out concentration into membrane module after being heated by heating unit makes vapor penetrate hydrophobic microporous membrane, later water vapour
It can be exported to by condensation and distillate liquid case, concentrated waste water returns to feed well by the road.Membrane distillation processing proposed by the present invention
The method and system of waste water can further decrease the volume of waste water compared with general wastewater treatment method, improve water outlet water
Matter meets the environmental requirement of near-zero release；Compared with traditional evaporation technology, in equipment size, energy consumption, with water, operable
Property, maintainability etc. there is apparent advantage.
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
The embodiment of the present invention one provides a kind of membrane distillation processing waste water system, is the embodiment of the present invention referring to Fig. 1, Fig. 1
One system structure diagram, the system include：
It is used to heat for storing the feed well 100 of pending waste water, being connected on the outgoing route of feed well 100
The heating unit 200 of waste water, the membrane module 300 for the waste water after membrane distillation processing heating being connect with heating unit 200；Also
Including：
The pretreatment unit 102 being connected between feed well 100 and heating unit 200, and it is connected to membrane module 300
The vacuum subassembly 400 at cold side end, pretreatment unit 102 retain the suspended matter in waste water, and will for being pre-processed to waste water
Pretreated waste water is fed through in heating unit 200；Vacuum subassembly 400 is for improving 300 cold side end of membrane module and hot side end
The pressure difference at both ends, and then the flux of membrane module is improved, it is convenient for the large-scale application of wastewater treatment.
Specifically, feed well 100 is non-pressure cylindrical container, which is ellipse head, and bottom is set
There is sewage draining exit, is horizontally disposed with water outlet, it is possible to reduce solid impurity enters downstream processing unit in waste water, can carry out blowdown；
It is equipped with dosing interface in feed well 100, reagent can be added with specific aim, adjust pH value, increase treatment effect etc., pH is default herein
It is worth ranging from 6-9；Temperature monitoring device and first liquid level gauge 100A are equipped in feed well 100, for monitoring in feed well 100
Waste water temperature signal and liquid level signal, herein in feed well 100 waste water temperature setting valve be 60 degrees Celsius, control range be 40~
80 degrees Celsius；
Heating unit 200 is welded to connect by stainless steel pipe on the outgoing route of feed well 100, useless for heating
Water；In the present embodiment, heating unit can be recuperative heat exchanger, such as shell-and-tube heat exchanger, can also be electric heater.Make
When with recuperative heat exchanger, heat supply is applied widely, can utilize low-temp low-pressure or high temperature and pressure steam or
Fluid etc. can effectively recycle heat；Further, 70 degrees Celsius of heating unit leaving water temperature setting valve in this system measures model
Enclose is 0~100 degree Celsius.
Membrane module 300 is welded to connect with heating unit 200 by stainless steel pipe, for useless after membrane distillation processing heating
Water；Membrane module 300 may include that the membrane module of multigroup parallel connection, single group membrane module are modularized equipment, membrane module quantity foundation herein
The processing flow determines.Further, membrane module 300 establishes the membranous system of pressure difference driving (temperature difference) using cold side vacuum,
The waste water in the feed well 100 is heated and kept into set temperature, imports hydrophobic film component 300, keeps film both sides
Pressure difference (temperature difference), hot side vapour pressure are higher than cold side, and steam condensation after film, which exports to, distillates liquid case 500.Wherein hot side
Waste water temperature, according to 105 set value calculation of thermometer, ensures that hot side waste water temperature is constant, cold side is true by the heating unit 200
Reciprocal of duty cycle, according to 401 set value calculation of vacuum meter, finally ensures that both sides differential pressure of membrane (temperature difference) is constant by vacuum pump 404；Further, this
It is about 30-40 degrees Celsius to locate temperature range.
Pretreatment unit 102 is welded to connect by stainless steel pipe between feed well 100 and heating unit 200, is used for
Waste water is pre-processed, the suspended matter in waste water is retained, pretreated waste water is fed through in heating unit 200；Herein
Pretreatment unit 102 is used to use conventional filtration (filters such as basket, filter cartridge type, activated carbon) to pending waste water, micro-filtration, surpass
Impurity, the pretreatment unit 102 such as filter or technologies decontamination suspended matter, the colloid such as sand filtration are connect with feed well 100, giving up after processing
Water returns to feed well 100 by the road；Or pretreatment unit is arranged between feed well 100 and membrane module 300, the feed well
Interior waste water imports the membrane module 300 by the road after pretreatment unit processing；In other embodiments of the present invention
In, pretreatment unit can be cancelled or be substituted by other techniques, such as using conventional evaporation, desalination, film process technology.
Vacuum subassembly 400 is welded to connect by stainless steel pipe at the cold side end of membrane module 300, for improving membrane module
The pressure difference at 300 cold side ends and hot side end both ends, and then the flux of membrane module is improved, it is convenient for the large-scale application of wastewater treatment.This
Place maintains negative pressure by condenser 403 and vacuum pump 404, and 300 cold side vacuum degree of membrane module is monitored by vacuum meter 401, can be film
Distillation process provides pressure difference big as possible, improves the flux of membrane distillation.
Further, membrane distillation processing waste water system provided by the invention further includes that first connect with feed well 100 follows
The isolating valve 106 on 120 path of second circulation channel is arranged in ring channel 110 and second circulation channel 120, and setting exists
By-passing valve 107 on 110 path of first circulation channel.
The exit at one end 300 hot side end of connection membrane module in first circulation channel 110, the one of second circulation channel 120
The other end in the inlet at end 300 hot side end of connection membrane module, first circulation channel 110 and second circulation channel 120 connects jointly
100 entrance of hopper is tapped into, tubing is stainless steel in the first, second circulation canal, and connection type is welding.
Wherein, 110 circulating path of first circulation channel includes successively：100 wastewater outlet of feed well, connect with wastewater outlet
Delivery pump 101, pretreatment unit 102, heating unit 200, by-passing valve 107 to 100 water inlet of feed well；It is opened when system is in
When the dynamic stage, this circulation canal is opened to heat, mix the waste water of material feeding box.
120 circulating path of second circulation channel includes successively：100 wastewater outlet of feed well, what is connect with wastewater outlet is defeated
Send pump 101, pretreatment unit 102, heating unit 200, membrane module 300, isolating valve 106 works as system to 100 water inlet of feed well
When in normal automatic running, this circulation canal is normally opened.
Isolating valve 106 is arranged on 120 path of second circulation channel, in normal operation, opening isolating valve 106,
Waste water after the concentration of membrane module 300 is delivered to by first circulation channel 110 in feed well 100 and carries out circular treatment；
By-passing valve 107 is arranged on 110 path of first circulation channel, in startup stage, second circulation channel 120 to be closed
When closing, so that first circulation channel 110 is opened, the waste water in feed well 100 is stirred and heated, reduces in feed well 100
Contamination precipitation.
Further, membrane distillation processing waste water system provided by the invention further includes delivery pump 101, regulating valve 104, control
The flow set gradually on pipeline and along transport path is arranged between the heating unit 200 and membrane module 300 in unit 600
Meter 103, thermometer 105 and the second conductivity meter 501A.
Specifically, delivery pump 101 is welded to connect by stainless steel pipe between pretreatment unit 102 and feed well 100
Transport path on, for by the waste water supercharging of feed well 100 and being delivered to pretreatment unit 102, provide and overcome pretreatment single
The power of member 102, heating unit 200, regulating valve 104, membrane module 300, pipeline and valve resistance；Wherein, delivery pump 101 goes out
Mouth pressure is about 2Bar.
Regulating valve 104 is connected between heating unit 200 and membrane module 300, the flow for adjusting the waste water after heating.
Control unit 600 controllably connects delivery pump 101, regulating valve 104, heating unit 200 and vacuum subassembly respectively
400, for being instructed according to different inputs, controls respectively and the waste water of feed well 100 is delivered to progress in pretreatment unit 102
Pretreatment controls 101 feed flow of delivery pump, controls the heating unit 200 and is heated to preset temperature to waste water, and controls true
Empty component 400 vacuumizes the cold side end of membrane module 300, to improve the pressure difference at membrane module 300 cold side end and hot side end both ends.
Flowmeter 103 and thermometer 105 are respectively used to the flow and temperature of the waste water after monitoring heating.
Second conductivity meter 501A connections control unit 600 is used to monitor on-line the conductivity of waste water after heating.
Control unit 600 is additionally operable to receive flowmeter 103 respectively, the reality of thermometer 105 and the second conductivity meter 501A
Flow signal, temperature signal and conductivity signal, and with the preset flow value inside control unit 600, preset temperature value and pre-
If conductivity value is compared, and is controlled the flow of the adjusting waste water of the regulating valve 104 according to comparison result and controlled described add
Hot cell 200 adjusts the heating temperature of waste water.
Further, 300 cold side end of membrane module connects the vacuum subassembly 400, the first conductivity meter 501 and distillates liquid case
500, the vacuum subassembly 400 includes：
Vacuum meter 401 is connected between 300 cold side end of membrane module and condenser 403, while connecting above-mentioned control unit
600, the vacuum degree for monitoring 300 cold side end of membrane module；
Condenser 403, the air cooling tower 402 being connected on condenser 403, the cooling water in air cooling tower 402 are used for condensation
Device 403 is cooled down, and will be distillated liquid condensing and is recycled, cooling water may be used the synergic systems such as chilled water, cooling water and replace
Generation, effective energy-saving and water-saving；Further, 300 cold side of membrane module may be used combination cooling mode substitute condenser cooling substitute,
It is directly mixed with the distillate of cold side using cooling water, reaches cooling distillate, maintain the purpose of cold side vacuum degree；
Vacuum pump 404 is connect with condenser 403, the negative pressure value for keeping cold side end；
Control unit 600 is also connected with vacuum meter 401, for receiving the vacuum degree signal, and with predetermined vacuum angle value into
Row compares, and the working condition of vacuum pump 404 is controlled according to comparison result.
In the present embodiment, in vacuum subassembly 400 connection of each component stainless steel pipe is selected to be welded to connect.
Further, membrane distillation processing waste water system provided by the invention further includes：
Air cooling tower 402 is arranged in the top of condenser 403, for being cooled down to condenser 403；
Liquid case 500 is distillated, is welded to connect by stainless steel pipe with condenser 403, for collecting distillate；
Liquid level gauge (100B) is connect with the liquid case (500) that distillates, for monitoring the work liquid level for distillating liquid case (500)；
Described control unit (600) is additionally operable to the work for distillating liquid case (500) monitored according to the liquid level gauge (100B) of reception
Make liquid level signal, and compared with distillating liquid case level value with default highest, to reach default highest pre- if actually distillating liquid case level value
If value, then suspend heating unit (200), membrane module (300) and vacuum pump (404)；
First conductivity meter 501, be connected to condenser 403 and it is described distillate liquid case 500 between, while connecting above-mentioned control
Unit 600, the conductivity for monitoring distillate on-line；The preset value of conductivity is 20 μ S/cm herein, and it is to locate to be less than the value
Reason is qualified.
The system of membrane distillation processing waste water provided by the invention further includes moveable cabinet 700, is opened on the cabinet 700
It is equipped with：
Water inlet 701 is connect with the import of feed well 100, is used for external waste water；
Concentrated solution outlet 702 is connect with the outlet of feed well 100, for concentrate to be discharged；
Water outlet 703 is connect with liquid case 500 is distillated, for distillate to be discharged；
Wherein, feed well 100, first liquid level gauge 100A, delivery pump 101, pretreatment unit 102, heating unit 200, film
Component 300, vacuum subassembly 400, flowmeter 103, regulating valve 104, thermometer 105, the second conductivity meter 501A, isolating valve 106,
By-passing valve 107, distillates liquid case 500, the first conductivity meter 501, and second liquid level gauge 100B and control unit 600 are arranged in cabinet
It is interior.Equipment and water tank, pipeline, valve, measuring instrument, control system that each process procedure of above-mentioned all components is related to etc.
It is integrated into Mobile cabinet, realizes moveable modular unit, be powered and can work normally after replacing job site.Inside system
System has a style of one's own, and Mobile cabinet externally only sets three water inlet, fresh water outlet mouth and concentrated solution outlet inlet and outlet, integrated system tool
There are the functions such as automatic running, auto-flushing, fault alarm and monitoring water quality on line.
Referring to Fig. 2, the present invention is provided in the control system of membrane distillation processing waste water, and control unit 600 is distinguished controllable
The switch of connection feed well 100, delivery pump 101, adjusting pump 104, isolating valve 106, by-passing valve 107, heating unit 200 are air-cooled
Tower 402, condenser 403 and vacuum pump 404, while first liquid level gauge 100A is connected, thermometer 105, flowmeter 103, the second electricity
Electrical conductivity instrument 501A, the first conductivity meter 501, vacuum meter 401 and second liquid level gauge 100B；
Wherein, control unit 600 includes memory module 601, receiving module 602, comparison module 603 and control module 604：
When work, first liquid level gauge 100A, thermometer 105, flowmeter 103, the second conductivity are received by receiving module 602
Instrument 501A, the first conductivity meter 501, the real work that the monitoring instruments such as vacuum meter 401 and second liquid level gauge 100B monitor
After parameter signal, by comparison module 603 by the parameter signal of above-mentioned real work with pre-established in storage module 601 it is opposite
The deviation of the range of signal preset value when the normal work answered is made comparisons, and thus deviation is according to preset in memory module 601
Correlation between multi-parameter, real-time control and the start and stop for adjusting the equipment such as heating unit 200, regulating valve 104, vacuum pump 404
And adjusting, maintain measured value consistent with preset value, to reach the technique effect of automatic running and on-line monitoring.
Wherein, memory module 601 is used to pre-establish the relation table between the flux and multiple parameters of membrane module 300, institute
It includes the liquid flow magnitude flowed through in pipeline to state multiple parameters, the heating temperature value of heating unit 200 and vacuum pump 404
Vacuum values；Wherein, in the values of parameter, flow, heating temperature and vacuum degree respectively with the flux of membrane module 300 at
Positive correlation, i.e., in the values of parameter, flow, heating temperature and vacuum degree are higher, and the flux of membrane module 300 is bigger.
Meanwhile the model of signal preset value of the memory module 601 when also having pre-established the normal work of multiple monitoring devices
It encloses, includes the work level value of first liquid level gauge 100A and second liquid level gauge 100B, the first conductivity meter 501 and the second conductivity
The conductivity value of instrument 501A.
Actual flow signal and temperature signal of the receiving module 602 for receiving flowmeter 103 and thermometer 105, and and
The preset value of memory module 601 is compared, and is additionally operable to adjust the temperature of 200 heated waste water of heating unit according to preset value.
Further, receiving module 602 is additionally operable to the feed well 100 of monitoring first liquid level gauge 100A and second liquid level gauge 100B
Interior liquid level signal, and with the feed well highest of memory module 601, minimum work liquid level and the preset value for distillating liquid case highest liquid level
It is compared.
Meanwhile receiving module 602 is also connected with vacuum meter 401, the vacuum degree for monitoring 300 cold side end of membrane module；And
The first conductivity meter 501 and the second conductivity meter 501A are connected, the electricity for monitoring 300 hot side end of distillate and membrane module on-line
Conductance, the wherein setting valve of the conductivity of distillate are 20 μ S/cm, and it is to handle qualification to be less than the value.
The parameter signal that comparison module 603 is used to be received according to receiving module 602, compares actual measured value and preset value
Deviation, thus deviation is according to the correlation between preset multi-parameter in memory module 601, real-time control and to adjust heating single
The start and stop and adjusting of the equipment such as member 200, regulating valve 104, vacuum pump 404 maintain measured value consistent with preset value；
Control module 604 controllably connects the switch of feed well 100, delivery pump 101 and regulating valve 104, heating respectively
Unit 200 and vacuum subassembly 400 control the charging switch of feed well 100 for being instructed according to different input respectively, will be into
The waste water of hopper 100, which is delivered in pretreatment unit 102, carries out wastewater treatment, and control heating unit 200 is heated to waste water pre-
If temperature, adjusts the waste water after heating and lead to the flow of membrane module 300, and control cold side of the vacuum subassembly 400 to membrane module 300
End vacuumizes, to improve the pressure difference at membrane module 300 cold side end and hot side end both ends.
Meanwhile control module 604 also distinguishes controllable connection isolating valve 106 and by-passing valve 107, starts rank in system
Section after control module 604 starts heating unit 200, can open by-passing valve 107 by control, close isolating valve 106, cycle
Heat the waste water of material feeding box 100.
Embodiment two
An embodiment of the present invention provides a kind of methods that membrane distillation handles waste water, are suitable for a kind of film shown in embodiment one
The system of distillation processing waste water, referring to Fig. 3 combination Fig. 2, this method includes：
S100, pending waste water is imported into feed well 100, control module 604 by the water inlet 701 on cabinet 700
It controls delivery pump 101 to open, prepare for the membrane distillation processing of system；
Specifically, being equipped with first liquid level gauge 100A, the liquid level signal for monitoring feed well 100 on-line in feed well 100.
When the work level value signal that the first liquid level gauge 100A that receiving unit 602 receives is detected is relatively high through comparison module 603
When preset feed well highest works liquid level, feed well 100 is in full state；Under this state, the control of control module 604 is closed
The switch of feed well 100 stops feed well 100 and intakes, and waiting for automated system operation, more distillates, reduction are useless so that membrane distillation goes out
The volume of water.
When the work level value signal that the first liquid level gauge 100A that receiving unit 602 receives is detected is through comparison module
603 when comparing work liquid level minimum less than preset feed well, and control module 604 suspends delivery pump 101,200 He of heating unit
Vacuum pump 404 is to membrane distillation unit of stopping transport；Meanwhile fault alarm is carried out, notify staff adds into feed well to wait locating
The waste water of reason.
Receiving module 602 receives the feed well temperature signal of temperature monitoring device, according to actual temperature signal, through comparing mould
Block 603, which compares, judges waste water temperature in feed well 100, is such as less than control range (40~80 degrees Celsius), then is startup
Stage enters step S101；Otherwise, it is non-start up stage, i.e. normal operating conditions, enters step S200；
Specifically, step S101, when system is in startup stage, control module 604 starts heating unit 200, Ke Yitong
Unlatching by-passing valve 107 is crossed, isolating valve 106 is closed, so that waste water in membrane module hot side end system is entered first circulation channel, opened
Dynamic heating, the waste water of circulating-heating material feeding box 100, so that the waste water in system is reached the temperature requirement of nominal situation, (setting valve is
60 degrees Celsius, control range is 40~80 degrees Celsius), waste water enters step S200 later；
S200, system enter normal automatic operating state, and 604 control system of control module closes by-passing valve 107 at this time, opens
Isolating valve 106 is opened, waste water in membrane module hot side end system is made to enter second circulation channel.Waste water enter pretreatment unit 102 into
Row pretreatment, removes the solid impurities such as the suspended matter in waste water, protects the operation steady in a long-term of downstream membrane module, herein can root
Flexibly it is arranged according to pending waste water quality, conventional filtration (basket, filter cylinder can be used to pending waste water in pretreatment unit herein
The filters such as formula, activated carbon), micro-filtration, the impurity such as technologies decontamination suspended matter, the colloid such as ultrafiltration or sand filtration；Pretreated waste water
It enters in heating unit 200 and is heated to 50 degrees Celsius to 100 degrees Celsius, 200 outlet line of heating unit is equipped with flowmeter
103, regulating valve 104, thermometer 105 and the second conductivity meter 501A, the flow value of real time on-line monitoring waste water, heating temperature value
And conductivity value.
When the working flow value signal that the flowmeter 103 that receiving unit 602 receives detects compares through comparison module 603
When less than preset lowest stream magnitude, the control of control module 604 increases the output power or up-regulation regulating valve 104 of delivery pump 101
Flow is controlled to the working flow of upper adjusting system；When the working flow that the flowmeter 103 that receiving unit 602 receives detects
When value signal is compared through comparison module 603 higher than preset maximum flow value, the control of control module 604 reduces delivery pump 101
Output power lowers the working flow that regulating valve 104 controls flow to lower adjusting system.
When the waste water operating temperature value signal that the thermometer 105 that receiving unit 602 receives detects is through comparison module 603
When comparing the range beyond preset operating temperature value, control module 604 adjusts the operating power of heating unit 200, makes waste water
Operating temperature return in the range of preset operating temperature value；Further, temperature range described herein may be set in 70-
It 100 degrees Celsius, can be set taking human as input；200 process of heating unit is adjusted herein and uses the prior art, is not detailed.
When the waste water that the second conductivity meter 501A that receiving unit 602 receives is detected works conductivity signal through comparing
When 603 longer-term of module exceeds the range of preset waste water work conductivity value, waste water is in special operation condition state；This state
Under, regulating valve 104, isolating valve 106 and by-passing valve 107 are opened in the control of control module 604, are opened delivery pump 101, are carried out mixing work
Industry can effectively prevent precipitation excessive；It is carried out at the same time fault alarm, staff is notified to be detected pretreatment unit 102.
Further include：
Waste water after S300, heating, which is delivered in membrane module 300, carries out membrane distillation, at a kind of membrane distillation of the present invention
The characteristics of method of reason waste water only allows the volatile components such as vapor to pass through fenestra using one kind by hydrophobic microporous membrane, when
When the both sides of film keep certain temperature difference, there are vapor pressure differentials for the cold and hot both sides of membrane module, and hot side vapor is in steam pressure
It passes through fenestra to reach cold survey under the action of difference, encounters cooling water or cold air condenses into distillate.And it is not volatile in waste water
Property isotopic ion is retained, and is realized the concentration of radioactive wastewater, that is, is purified volume reduction.The present invention is by being connected to membrane module
The vacuum subassembly 400 at 300 cold side ends vacuumizes it, improves the pressure difference at membrane module 300 cold side end and hot side end both ends, carries
The flux of high membrane distillation, makes distillate meet emission request；
The present invention judges the liquid after membrane distillation by above-mentioned principle, wherein 300 cold side end of membrane module passes through
The precipitation liquid of fenestra is vapor, enters step S400；The 300 remaining liquid in hot side end of membrane module is residue after membrane distillation
Concentration waste water, enter step S301.
Vacuum meter 401, the vacuum at 300 cold side end of on-line real time monitoring membrane module are set on 300 cold side end pipe line of membrane module
Spend signal.When the membrane module cold side end vacuum degree signal that the vacuum meter 401 that receiving unit 602 receives detects is through comparison module
603 when comparing the range beyond preset working vacuum angle value, and the operating power of vacuum pump 404 is adjusted by control module 604, is made
300 cold side end vacuum degree of membrane module returns in the range of preset working vacuum angle value；Further, vacuum ranges described herein
It can control, can be set taking human as input within the scope of absolute pressure 5-50kPa.
Further, this method further includes
Concentration waste water after S301, membrane distillation returns to feed well 100 by the isolating valve 106 of unlatching, with newly into import into
The waste water of hopper 100 mixes, and reenters the normal automatic running cycle of system.
S400, the vapor after membrane distillation is condensed, the cooling water needed for condenser 403 is responsible for by air cooling tower 402
Cool down and recycle, effective energy-saving and water-saving, herein condensation process use the prior art, be not detailed；Enter step S500.
The conductivity of distillate, evaporates distillating the collection of liquid case 500 after S500, the on-line monitoring condensation of the first conductivity meter 501
Go out liquid.
When the work conductivity value signal that the first conductivity meter 501 that receiving unit 602 receives detects is through comparing mould
Block 603 compare higher than preset waste water work conductivity value range when (setting valve be 20 μ S/cm, be less than the value be handle
It is qualified), waste water is in special operation condition state；Under this state, distillate water quality is unqualified, is stopped by 604 control system of control module
Machine, and fault alarm is carried out, notify staff to carry out complete detection to system.
Further, setting second liquid level gauge 100B in liquid case 500 is distillated, liquid case 500 is distillated for on-line real time monitoring
Liquid level.When the work level value signal that the second liquid level gauge 100B that receiving unit 602 receives is detected compares through comparison module 603
It is higher than preset when distillating liquid case preset value, it distillates liquid case 500 and is in full state；Under this state, present system passes through control
Molding block 604 suspends heating unit 200, membrane module 300 and vacuum pump 404, in the circulation canal for making 300 hot side end of membrane module
Carry out auto-flushing；Meanwhile fault alarm is carried out, notify staff to distillate distillating in liquid case 500 from the export of water outlet 703
Liquid.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
In conclusion the present invention is by waste water pre-process and after heated waste water, membrane distillation being carried out to it；Pass through company
The vacuum subassembly for being connected on membrane module cold side end vacuumizes it, improves the pressure difference at membrane module cold side end and hot side end both ends,
Improve the flux of membrane distillation；Then the vapor after membrane distillation is condensed, it can be with ring after meeting related request to acquisition
The distillate of border discharge.
The art of this patent maintains cold side vacuum by vacuum pump, improves membrane flux；Level-one is arranged to pre-process, improves system
Stability, can be with long-time steady operation；Recuperative heat exchanger is set, improves waste heat and receives；Cooling water is recycled, is saved
Use water.These process characteristics are effectively combined simultaneously and improve the height of film distillation technology in the treatment of waste water together
Performance, high stability and high economy, reduce the performance requirement to membrane material.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of membrane distillation handles waste water system, which is characterized in that the system comprises：
Feed well (100), for storing pending waste water；
Heating unit (200), is connected on the outgoing route of feed well (100), is used for heated waste water；
Membrane module (300) is connect with heating unit (200), for the waste water after membrane distillation processing heating；
It is characterized in that, further including：
Pretreatment unit (102) is connected between feed well (100) and heating unit (200), for being located in advance to waste water
Reason retains the suspended matter in waste water, and pretreated waste water is fed through in heating unit (200)；
Vacuum subassembly (400) is connected to the cold side end of membrane module (300), for improving membrane module (300) cold side end and hot side end
The pressure difference at both ends, and then the flux of membrane module is improved, it is convenient for the large-scale application of wastewater treatment.
2. membrane distillation according to claim 1 handles waste water system, which is characterized in that further include：Even with feed well (100)
The first circulation channel (110) and second circulation channel (120) connect, one end junctional membrane group of the first circulation channel (110)
The inlet at part (300) hot side end, the outlet at one end connection membrane module (300) hot side end of the second circulation channel (120)
Locate, the other end of the first circulation channel (110) and second circulation channel (120) connects feed well (100) entrance jointly；
Isolating valve (106) is arranged on second circulation channel (120) path, in normal operation, opening isolating valve
(106), the waste water after the membrane module (300) concentration is delivered to the charging by the second circulation channel (120)
Circular treatment is carried out in slot (100)；
By-passing valve (107) is arranged on first circulation channel (110) path, in startup stage, the second circulation
When channel (120) is closed, so that the first circulation channel (110) is opened, the waste water in feed well (100) is stirred and is added
Heat reduces the contamination precipitation in feed well (100).
3. membrane distillation according to claim 1 handles waste water system, which is characterized in that further include：
Delivery pump (101) is connected on the transport path between pretreatment unit (102) and feed well (100), for that will feed
Slot (100) waste water supercharging is simultaneously delivered to the pretreatment unit (102)；
Regulating valve (104) is arranged between the heating unit (200) and membrane module (300) on pipeline, for adjusting in pipeline
Wastewater flow；
Control unit (600) controllably connects delivery pump (101), regulating valve (104), heating unit (200), vacuum respectively
Component (400) controls the waste water of feed well (100) being delivered to the pretreatment respectively for being instructed according to different inputs
It is pre-processed in unit (102), controls the delivery pump (101) feed flow, control the heating unit (200) to waste water
It is heated to preset temperature, and controls vacuum subassembly (400) and the cold side end of membrane module (300) is vacuumized, to improve membrane module
(300) pressure difference at cold side end and hot side end both ends.
4. membrane distillation according to claim 3 handles waste water system, which is characterized in that further include that setting is single in the heating
Between first (200) and membrane module (300) on pipeline and along the flowmeter (103) that transport path is set gradually, thermometer (105),
And conductivity meter (501A)；Described control unit (600) also respectively with the flowmeter (103), thermometer (105), and
Conductivity meter (501A) connects；
Described control unit (600) for receiving the flowmeter (103), thermometer (105) and conductivity meter (501A) respectively
Actual flow signal, temperature signal and conductivity signal, and the preset flow value internal with described control unit (600), in advance
If temperature value and default conductivity value are compared, and control the stream that the regulating valve (104) adjusts waste water according to comparison result
Measure and control the heating temperature that the heating unit (200) adjusts waste water.
5. membrane distillation according to claim 1 handles waste water system, which is characterized in that the vacuum subassembly (400) includes：
Vacuum meter (401) is arranged on the membrane module (300) cold side end pipe line and is connect with control unit (600), for real
When monitor membrane module (300) cold side end vacuum degree signal, the vacuum degree signal is sent to control unit (600)；
Condenser (403) is connect with the membrane module (300) cold side end, is used for the membrane module (300) cold side end distillate gas
It is condensed into distillate；
Vacuum pump (404) is connect with the condenser (403), the negative pressure value for keeping the membrane module (300) cold side end；
Described control unit (600) is also connected with the vacuum meter (401), for receiving the vacuum degree signal, and it is true with presetting
Reciprocal of duty cycle value is compared, and the working condition of the vacuum pump (404) is controlled according to comparison result.
6. membrane distillation according to claim 5 handles waste water system, which is characterized in that further include air cooling tower (402), setting
Top in condenser (403), for being cooled down to the condenser (403)；
Liquid case (500) is distillated, is connect with the condenser (403), for collecting the distillate；
Liquid level gauge (100B) is connect with the liquid case (500) that distillates, for monitoring the work liquid level for distillating liquid case (500)；
Described control unit (600) is additionally operable to the working solution for distillating liquid case (500) monitored according to the liquid level gauge (100B) of reception
Position signal, and compared with distillating liquid case level value with default highest, if actually distillating liquid case level value reaches default highest preset value,
Then suspend heating unit (200), membrane module (300) and vacuum pump (404)；
Conductivity meter (501), setting the condenser (403) and it is described distillate between liquid case (500) on pipeline, and connect institute
Control unit (600) is stated, for monitoring distillate conductivity signal on-line；Described control unit (600) is additionally operable to according to reception
Distillate conductivity signal, if judge distillate be not up to standard requirement, send out alarm signal.
7. membrane distillation according to claim 3 handles waste water system, which is characterized in that described control unit (600) includes
Memory module (601), receiving module (602) and comparison module (603)；
The memory module (601) is described more for pre-establishing relation table of the membrane module (300) between flux and multiple parameters
A parameter includes the liquid flow magnitude flowed through in pipeline, the heating temperature value of heating unit (200), feed well (100) and is distillated
The level value of liquid level gauge (100A) and (100B) of liquid bath (500), vacuum pump (404) vacuumize value and membrane module inlet and outlet
Conductivity meter (501) and (501A) conductivity value；
For the receiving module (602) for receiving the actual numerical value detected in real time, the numerical value includes the liquid flowed through in pipeline
Body flow value, feed well (100) and the level value for distillating liquid bath (500), the heating temperature value of heating unit (200), vacuum pump
(404) value and membrane module (300) inlet and outlet conductivity value are vacuumized；
The comparison module (603) is used to, according to the parameter signal detected, calculate the deviation of actual measured value and preset value, institute
Deviation is stated according to the correlation between preset multi-parameter in memory module (601), real-time control and adjusting heating unit
(200), the start and stop and adjusting of regulating valve (104), vacuum pump (404) equipment maintain measured value consistent with preset value.
8. membrane distillation according to claim 7 handles waste water system, which is characterized in that also set in the feed well (100)
It is equipped with the liquid level gauge (100A) of monitoring liquid level, described control unit (600) is connected with the feed well liquid level gauge (100A),
Work liquid level signal for receiving feed well (100), and compared with default feed well level value；When detecting the feed well
(100) when interior liquid level reaches highest work liquid level, control stops the feed well (100) water inlet, or when detect it is described into
When hopper (100) interior liquid level is less than minimum work liquid level, suspend membrane distillation unit, the membrane distillation unit includes multigroup in parallel
The membrane module (300).
9. membrane distillation according to claim 8 handles waste water system, which is characterized in that the quantity of the membrane module (300)
It is determined according to processing flow.
10. membrane distillation according to any one of claims 1 to 9 handles waste water system, which is characterized in that further include moveable
Cabinet (700) offers on the cabinet (700)：
Water inlet (701) is connect with the import of feed well (100), is used for external waste water；
Concentrated solution outlet (702) is connect with the outlet of feed well (100), for concentrate to be discharged；
Water outlet (703) is connect with liquid case (500) is distillated, for distillate to be discharged；
Feed well (100), liquid level gauge (100A), delivery pump (101), pretreatment unit (102), heating unit (200), membrane module
(300), vacuum subassembly (400), flowmeter (103), regulating valve (104), thermometer (105), conductivity meter (501A), isolating valve
(106), by-passing valve (107), conductivity meter (501) distillate liquid case (500), liquid level gauge (100B), control unit (600) setting
In cabinet (700).
11. a kind of membrane distillation handles method for waste water, using membrane distillation as described in claim 1 handle waste water system to waste water into
Row processing, which is characterized in that including following processing step：
S100, pending waste water is imported into feed well (100)；
S200, waste water is pre-processed by pretreatment unit (102), retains the suspended matter in waste water, it will be pretreated
Waste water is fed through in heating unit (200) and is heated；
Waste water after S300, heating, which is delivered in membrane module (300), carries out membrane distillation, by being connected to membrane module (300) cold side
The vacuum subassembly (400) at end vacuumizes it, improves the pressure difference at membrane module (300) cold side end and hot side end both ends, improves
The flux of membrane distillation.
12. membrane distillation according to claim 11 handles method for waste water, which is characterized in that
Further include following steps before S200 steps：
System start-up phase closes isolating valve (106), opens by-passing valve (107), waste water is made to pass through first circulation before membrane distillation
Channel (110) returns to feed well (100) to mix the waste water of material feeding box (100).
13. membrane distillation according to claim 12 handles method for waste water, which is characterized in that further include：
Concentration waste water after S301, membrane distillation returns to feed well by opening the second circulation channel (120) of isolating valve (106)
(100)；
S400, the vapor after membrane distillation is condensed, the cooling water needed for condenser (403) is responsible for by air cooling tower (402)
It cools down and recycles；
The conductivity of distillate, distillate is collected distillating liquid case (500) after S500, conductivity meter (501) on-line monitoring condensation.
14. membrane distillation according to claim 13 handles method for waste water, which is characterized in that the first circulation channel
(110) circulating path includes successively：Feed well (100) wastewater outlet, the delivery pump being connect with wastewater outlet (101), pretreatment
Unit (102), heating unit (200), by-passing valve (107) to feed well (100) water inlet；
Second circulation channel (120) circulating path includes successively：Feed well (100) wastewater outlet, what is connect with wastewater outlet is defeated
Send pump (101), pretreatment unit (102), heating unit (200), membrane module (300), isolating valve (106) to feed well (100)
Water inlet.
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Effective date of registration: 20181112 Address after: 518100 Tian'an Digital Pioneer Park Building No. 2, 441 Longcheng Street, Longgang District, Shenzhen City, Guangdong Province Applicant after: Shenzhen China Nuclear Power Design Co., Ltd. Applicant after: China Nuclear Power Engineering Co., Ltd. Applicant after: China General Nuclear Power Corporation Address before: 518023 Office Building of Daya Bay Nuclear Power Base Engineering Company, Pengfei Road, Dapeng New District, Shenzhen City, Guangdong Province Applicant before: China Nuclear Power Engineering Co., Ltd. Applicant before: China General Nuclear Power Corporation |
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