CN110743367B - Automatic filtering system and process - Google Patents
Automatic filtering system and process Download PDFInfo
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- CN110743367B CN110743367B CN201911033977.2A CN201911033977A CN110743367B CN 110743367 B CN110743367 B CN 110743367B CN 201911033977 A CN201911033977 A CN 201911033977A CN 110743367 B CN110743367 B CN 110743367B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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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
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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Abstract
The filtration system described in this patent contains four filtration modes: dead end, cross flow first and then dead end, cross flow + dead end, three backwash setting modes: timing, constant speed and constant pressure, and three backwash modes of operation: gas backwash, liquid backwash and gas-liquid backwash. The system has high integration level, comprehensive functions and convenient operation, and improves the operation efficiency and the operation safety through automatic control. The device is suitable for various filtering systems and backwashing media, greatly facilitates the optimization of the filtering process, and is easier to determine the optimal working condition.
Description
Technical Field
The invention belongs to the field of filtration and separation, and particularly relates to a multifunctional automatic filtration system and a process, which can optimize a filtration process efficiently and realize an optimal industrial effect.
Technical Field
Liquid filtration technology and equipment are increasingly applied to modern industries, such as catalyst recovery, liquid medicine clarification, beverage impurity removal, waste liquid treatment, water resource recycling and the like, and people are constantly exploring and making great progress in the aspects of filter materials, equipment and operation processes. In recent years, membrane materials are widely applied in the filtration industry, wherein organic membranes are cheap and have the widest application, but have the defects of poor stability, low strength and the like; the ceramic membrane has high filtration precision, belongs to a brittle material, has high cost and is difficult to seal at high temperature; the metal film is mainly made of stainless steel, has high strength, good stability and easy installation, is particularly suitable for harsh working conditions, but has higher cost and generally lower filtering precision than organic and ceramic films.
The industrial filtration mode mainly comprises a dead end mode and a cross flow mode, and the latter mode can continuously wash pollutants and filter cakes on the surface of a filter material by means of shearing force generated by high-speed flow of feed liquid on the surface of the filter material, so that the filtration resistance is reduced, and continuous operation for a longer time can be realized. Unlike cross-flow filtration, dead-end filtration does not have high-speed backflow of feed liquid and scouring of the surface of the filter material. In the operation process, the thicker the filter cake on the surface of the filter material is, the greater the filtration resistance is gradually, the lower the permeation flux is gradually, and the filter material is generally recovered to the permeability through online backwashing and slag discharge.
For a specific filtering system, the success or failure of the engineering technology mainly depends on filtering equipment, filtering materials and an operation process, and the whole engineering can be seriously influenced by the problem of any link. For example, even if the filtration effect reaches the standard, if the investment is too large, the operation cost is high, the energy consumption is high, and the production efficiency is low, the industrialization is difficult to realize. Therefore, before and during the implementation of the filtration engineering, sufficient testing and optimization of the filtration equipment, materials and operation processes are extremely important, and only the optimal filtration conditions (filters, pump valve fittings, filtration modes, filtration pressures, filtration temperatures, backwash media, backwash pressures, backwash times, driving modes, etc.) can bring the best overall engineering benefits. However, obtaining an optimal process is often not easy. In fact, the filtration experiment research is almost a daily task for the filtration engineering technicians, and the related research reports are also endless. For example, patent 201410069640.8 discloses a "high-efficiency solid-liquid separation device", in which wastewater is pumped into a "membrane filter tube" assembly through a circulating water pump in a cross-flow manner, feed liquid is continuously concentrated in a water storage tank, and finally the concentrated feed liquid is pumped into a sludge concentration tank or a filter press through a pneumatic diaphragm pump. Chenyan and the like [ chenyan, who policy, high intelligence, li dong litre ] experimental study of liquid filtration technology in oil field sewage treatment, petroleum machinery, 2015, 43 (12): 95-99 ] a small-sized filter is designed to remove the dirty oil and suspended substances in the oil field sewage. Patent 200710068654.8 discloses a solid-liquid separation method and apparatus, which further performs liquid removal on the concentrated solution by means of mechanical filter pressing to form drier filter residue. Patent 201310692702.6 also discloses "a solid-liquid separation apparatus and method", which utilizes compressed air to replace a booster pump as a filter pressing driving force. Patent 201180007960.5 discloses a "solid-liquid separation method", which uses filter cloth to dewater sludge, and comprises four procedures of suction filtration, pressure filtration, squeezing, sludge discharge and the like.
Although almost all filter devices and processes are involved in each research report, they all aim at specific filter systems and known operation processes, have few device functions and little operation flexibility and are basically constructed in a temporary way [ Hua F L, tsang Y F, wang Y J, et al.performance study of ceramic microfiltration membrane for oil water treatment Journal,2007, 128 (2-3): 169-175.]. Under the condition that the filtering working condition is uncertain and even the filtering process is uncertain, the single device cannot complete the process screening and working condition optimizing work, more devices need to be built, and time, labor and cost are wasted. The utility model provides a test device that function is many, flexible operation, adaptability are wide, degree of automation is high, can carry out the screening and the optimization work of filtration technology and operating mode economically, reliably, safely, high-efficiently. In addition, the filtration system described in this patent can also be used directly in industrial filtration engineering.
Disclosure of Invention
The purpose of this patent lies in developing an automatic filtration system and technology, and mainly used liquid filters the experiment so that optimize filter media (material, structure, thickness, filtration precision etc.), technological parameters such as filter area, filtration pressure, filtration mode, backwash condition to adapt to various complicated operating modes, provide the basis for the industrialization is used.
The technical scheme of this patent: the automatic filtration system comprises six units, namely feed liquid storage, cross flow filtration, dead end filtration, backwashing slag discharge, filtrate storage, automatic control and the like, as shown in figure 1. The feed liquid storage unit (1) comprises a feed liquid inlet (101), a storage valve (102), a storage pump (103), an exhaust port (104), a storage tank (105), a liquid level meter (106), a discharge valve (107), a discharge port (108), a material return valve (109), a flow transmitter (110), a pressure transmitter (111) and a feed pump (112), and it is noted that if the feed liquid has pressure, the storage pump (103) can be omitted; the cross-flow filtering unit (2) comprises a cross-flow feed valve (201), a cross-flow backflow valve (202), a cross-flow filter (203), a cross-flow discharge pressure transmitter (204), a cross-flow backwashing valve (205) and a cross-flow discharge valve (206); the dead-end filtering unit (3) comprises a dead-end feeding valve (301), a dead-end filter (302), a dead-end discharging valve (303), a dead-end discharging pressure transmitter (304), a dead-end backwashing slag discharging valve (305), a slag discharging port (306), a filtrate flow transmitter (307), a filtrate flow control valve (308) and a dead-end backwashing valve (309); the backwashing slag discharging unit (4) comprises a dead-end backwashing exhaust valve (401), a backwashing liquid control valve (402), a backwashing gas control valve (403), a cross-flow backwashing exhaust valve (404), an exhaust port (405), a backwashing valve (406), a pressure gauge (407), a backwashing medium inlet (408), a backwashing tank (409), a backwashing tank emptying valve (410) and a backwashing tank emptying port (411); the filtrate storage unit (5) comprises an exhaust port (501), a filtrate tank (502), a filtrate feed valve (503), a liquid level meter (504), a filtrate discharge valve (505), a filtrate pump (506) and a filtrate outlet (507); the automatic control unit (6) is used for automatic control and data acquisition of the filtering system.
The filtration system disclosed by the patent has four working modes of a dead end, cross flow, first cross flow and then dead end, and cross flow plus dead end. (1) Dead-end filtration. In the filtering process, the feed liquid basically flows perpendicular to the membrane surface, feed liquid backflow is not carried out, suspended matters in the feed liquid form filter cakes or are retained in pore channels, and filtrate penetrates through the filter cakes and the filter material pore channels. When the resistance of the filter cake is too large or the pore passages of the filter material are seriously blocked, the filter material needs to be cleaned. (2) And (3) cross-flow filtration. The feed liquid flows rapidly along the surface of the filter material, a small part of the feed liquid penetrates through the filter material, and most of the feed liquid flows back to the storage tank (105). When the feed liquid flows rapidly, the filter cake formed on the surface of the filter material is washed, so that the thickness of the filter cake layer and the filtration resistance are reduced, and the cross-flow filtration can realize continuous operation for a longer time. With the continuous injection of new feed liquid and the continuous outflow of filtrate, the feed liquid in the storage tank (105) is gradually concentrated, so that the filtration resistance is continuously increased, and the concentrated liquid in the storage tank (105) is discharged to a certain degree. It should be noted that a large feed reflux will result in higher energy consumption. The scouring effect on the surface of the filter material can only reduce the resistance of the filter cake and has no effect on relieving the blockage in the pore channel, so that the cross-flow filtration is only suitable for the condition that the pore diameter of the filter material is small enough and the filtration resistance mainly comes from the filter cake. When the primary filtration resistance is due to plugging in the filter channels, crossflow filtration is not preferred and dead-end filtration should be used. (3) Cross flow first followed by dead end filtration. The cross-flow filtration is firstly carried out to realize the concentration of the feed liquid, and when the cross-flow filtration resistance is overlarge, the dead-end filtration is carried out on the concentrated solution. In the process of dead-end filtration, a filter cake is continuously thickened on the surface of a filter material and is discharged during backwashing or back flushing slag discharge to a certain degree. (4) Cross-flow + dead-end filtration. The dead end and the cross-flow filtration are operated simultaneously or the cross-flow is started first and then the dead end is operated. The concentration of the feed liquid in the material storage tank (105) is controlled by the slag discharged through the dead-end filtration, the respective advantages of cross flow and the dead-end filtration are fully exerted, the long-time continuous filtration is realized, and the filtration efficiency is improved.
The backwashing setting mode of the filtering system has three modes of timing, constant speed and constant pressure. (1) The timing backwashing refers to backwashing when the filtering time reaches a preset value. For example, the backwash operation is performed by a set time from the time when the cross-flow discharge valve (206) or the dead-end discharge valve (303) is opened. (2) The constant speed backwashing means that the backwashing is carried out when the filtrate output speed is slower than a preset value. For example, a backwash operation is performed when the filtrate flow transmitter (307) detects a decrease in filtrate flow to a set value. (3) Constant pressure backwashing refers to backwashing performed when the pressure difference between the feed side and the discharge side of the filter (the higher the pressure difference, the larger the filtration resistance) is higher than a predetermined value. For example, let the pressures displayed by the three pressure transmitters (111, 204, and 304) be the feed pressure P, respectively 0 Cross flow discharge pressure P 1 And dead end discharge pressure P 2 When P is present 0 -P 1 Or P 0 -P 2 Above a predetermined value, a backwashing operation is performed. The timing backwashing is simple and easy to implement, but the backwashing frequency cannot be automatically adjusted according to the filtering condition, and the method is suitable for the steady-state operation condition. The backwash interval of the constant velocity backwash and the constant pressure backwash can be automatically adjusted according to the filter resistance, but requires flow rate data or acquisition pressure and more complicated program control.
The backwash medium mode in this patent includes three kinds of gaseous backwash, liquid backwash and gas-liquid backwash, and the backwash medium includes backwash liquid and backwash gas. Among them, the backwash liquid includes filtrate and other liquids, but the filtrate is most commonly used. (1) Gas backwashing refers to backwashing with compressed gas, but before backwashing gas to permeate the filter material, filtrate on the discharge side of the filter and in the gas flow pipeline is also back-pressed and permeates the filter material. Common backwash gases are compressed air or nitrogen, but in practice other process gases will be used for safety or pollution reasons. (2) Liquid backwash refers to backwash liquid passing through the filter material in reverse direction at high speed. If the backwash itself is not under or is under pressure, a backwash pump may be added to the backwash media inlet (408). (3) Gas-liquid backwashing means that liquid backwashing is carried out firstly and then gas backwashing is carried out in the backwashing process. Wherein the liquid backwash is a filtrate comprising both the filtrate in the backwash tank (409) and the filtrate on the discharge side of the associated piping and filter. The driving force of gas-liquid backwashing comes from the pressure of backwashing gas, and the backwashing effect is better because compressed gas can provide larger explosive force. In addition, the volume of the backwashing tank (409) is suitable to avoid generating excessive slag discharging liquid.
The automatic control unit in this patent can carry out human-computer interaction and logic judgement, and automatic filtration and the backwash operation of various modes are realized to automatic operation through pump and valve, have realized operating parameter, equipment state and operation result's record and storage through sensor and data acquisition, have improved filtration system's operational safety through warning and emergent operation under setting for various circumstances, for example meet danger or special circumstances, can realize filtration system's emergency shutdown. In addition, in order to facilitate flexibility of equipment debugging and testing, the automatic control unit is also provided with a manual mode, and the automatic mode and the manual mode can be conveniently switched.
Although the automatic operation of the filter saves manpower and reduces human misoperation, and improves the operation efficiency and operation safety, the increase of investment cost is also inevitable, and the cost of equipment (such as pumps, valves, transmitters and the like) adaptive to the automatic control is higher besides the control system (electrical elements, programming and the like). To control the investment costs, valves that are not operated frequently or are not easily controlled automatically may be designed to be operated manually. Such as a discharge valve (107) and a discharge valve (109) in the feed liquid storage unit; a cross-flow feed valve (201) and a cross-flow return valve (202) in the cross-flow filtration unit; backwash tank emptying valve (410) in the reject unit is backwashed.
The beneficial effect of this patent embodies:
the filtration system integrates multiple working modes, has multiple functions, can realize various filtration and backwashing operations, is suitable for various filtration systems and backwashing media, is convenient for carrying out sufficient process optimization and determining the optimal working state, and improves the strain capacity of the system to different working conditions. Automatic control is realized, manpower is saved, manual operation errors are reduced, and operation efficiency and operation safety are improved. The filtering system is convenient to operate, high in integration level and capable of meeting various application and process requirements.
Drawings
FIG. 1 is a schematic diagram of an automatic filtration system. Wherein 101-a feed liquid inlet; 102-a storage valve; 103-a storage pump; 104-an exhaust port; 105-a storage tank; 106-a liquid level meter; 107-a discharge valve; 108-a discharge opening; 109-a material return valve; 110-a flow transmitter; 111-a pressure transmitter; 112-a feed pump; 201-cross-flow feed valve; 202-cross-flow reflux valve; 203-cross flow filter; 204-cross flow discharge pressure transmitter; 205-cross flow backwash valve; 206-cross-flow bleeder valve; 301-dead end feed valve; 302-dead-end filter; 303-dead end bleeder valve; 304-a dead end discharge pressure transmitter; 305-dead end backwash residue discharge valve; 306-a slag discharge port; 307-filtrate flow transmitter; 308-filtrate flow control valve; 309-dead end backwash valve; 401-dead end backwash exhaust valve; 402-backwash liquid control valve; 403-backwashing gas control valve; 404-cross flow backwash exhaust valve; 405-an exhaust port; 406-backwash valve; 407-pressure gauge; 408-backwash media inlet; 409-backwashing tank; 410-backwash tank evacuation valve; 411-backwash tank drain; 501-an exhaust port; 502-a filtrate tank; 503-filtrate feed valve; 504-a liquid level meter; 505-filtrate discharge valve; 506-a filtrate pump; 507-filtrate outlet.
Detailed Description
An embodiment of the filtration system of the present invention will now be described with reference to fig. 1. Modifications, improvements and additions to the technical solution of the present invention, such as equivalent or equivalent replacements or changes of some technical characteristics, are also within the protection scope of the present invention by those skilled in the art according to the patent content disclosed above.
Before filtration, feed liquid is injected into the storage tank (105), and the liquid level of the storage tank (105) is automatically controlled by opening and closing the storage valve (102) and the storage pump (103) according to the feedback of the liquid level meter (106).
(1) Dead end filtration. Feed liquid is pumped into the dead-end filter (302) through the feed pump (112), filtrate enters the filtrate tank (502), and the filtration pressure is regulated through the output power of the feed pump (112), the feed back valve (109) and the dead-end feed valve (301). The timing, constant speed or constant pressure backwashing of the filter material can be set in the automatic control unit.
During backwashing, the dead end feed valve (301), the dead end discharge valve (303), the filtrate flow control valve (308) and the filtrate feed valve (503) are closed, and the dead end backwashing slag discharge valve (305) is opened. When gas backwashing is selected, compressed gas is introduced into the backwashing medium inlet (408) and the backwashing gas control valve (403) is opened. When liquid backwash is selected, if backwash liquid is filtrate, first open backwash liquid control valve (402) and backwash valve (406); if the backwash liquid is other liquid, firstly, the backwash liquid under pressure or a backwash pump is connected to the backwash medium inlet (408) and a backwash control valve (403) is opened. When gas-liquid backwashing is selected, compressed gas is firstly introduced into a backwashing medium inlet (408) and a backwashing liquid control valve (402) and a backwashing valve (406) are opened. Finally, a dead-end backwash valve (309) is opened to perform the backwash operation.
At the end of the backwash, the dead end backwash valve is closed (309). When gas backwash is selected, the dead end backwash vent valve (401) is opened and closed after venting. When liquid backwashing is selected, if backwashing liquid is filtrate, the backwashing valve (406) is closed and the cross-flow backwashing exhaust valve (404) is opened for exhausting; if the backwash liquid is other liquid, the backwash pump is only required to be stopped. When gas-liquid backwashing is selected, the backwashing valve (406) is closed, and the dead-end backwashing exhaust valve (401) and the cross-flow backwashing exhaust valve (404) are opened for exhausting. And finally, opening a dead-end feed valve (301), a dead-end discharge valve (303), a filtrate feed valve (503) and a filtrate flow control valve (308), closing a dead-end backwashing slag discharge valve (305), and restarting a new filtering process.
(2) And (3) cross-flow filtration. The feed liquid is pumped into a cross flow filter (203) through a feed pump (112), the reflux liquid returns to a storage tank (105), and the filtrate enters a filtrate tank (502). The cross-flow feed flow and filtration pressure can be regulated by the feed pump (112) output power, the return valve (109), the cross-flow feed valve (201), and the cross-flow return valve (202).
And during backwashing, the cross-flow discharge valve (206), the filtrate flow control valve (308) and the filtrate feed valve (503) are closed. When gas backwashing is selected, compressed gas is connected to a backwashing medium inlet (408) and a backwashing gas control valve (403) is opened. When liquid backwash is selected, if backwash liquid is filtrate, firstly opening a backwash liquid control valve (402) and a backwash valve (406); if the backwash liquid is other liquid, the backwash liquid under pressure or a backwash pump is connected to the backwash medium inlet (408) and a backwash control valve (403) is opened. When gas-liquid backwashing is selected, compressed gas is required to be connected to a backwashing medium inlet (408) and a backwashing liquid control valve (402) and a backwashing valve (406) are opened. Finally, a cross-flow backwashing valve (205) is opened to perform backwashing operation.
And (4) after backwashing is finished, closing the cross-flow backwashing valve (205), and ending the gas backwashing operation. When liquid backwashing is selected, if backwashing liquid is filtrate, the backwashing valve (406) is closed and the cross-flow backwashing exhaust valve (404) is opened for exhausting; if the backwash liquid is other liquid, the backwash pump is only required to be stopped. When gas-liquid backwashing is selected, the backwashing valve (406) is closed, and the cross-flow backwashing exhaust valve (404) is opened for exhausting. And finally, opening a cross flow discharge valve (206), a filtrate flow control valve (308) and a filtrate feed valve (503) and restarting a new filtration process.
When the feed liquid in the storage tank (105) is concentrated to a certain degree and does not merit the cross-flow filtration, the feeding pump (112) is closed, the storage valve (102) and the storage pump (103) are set to be in a manual operation mode and are closed, the discharge valve (107) is opened, and the concentrated liquid in the storage tank (105) is discharged. And the material storage valve (102) and the material storage pump (103) are set to be in an automatic operation mode again, so that the material liquid is automatically filled into the material storage tank (105), and the cross-flow filtration can be continuously carried out. This patent is with storage pump (103) and charge pump (112) through the cross-joint of storage tank (105) lower part directly linking to each other, consequently at the in-process of the material liquid of filling to storage tank (105), the fresh material liquid of low concentration can directly get into cross-flow filter (203) to can improve cross-flow filtration efficiency, the filling speed of storage tank and cross-flow filter's storage speed are close the better then the effect more. It should be noted that the stock pump (103) may be omitted if the feed liquid is self-pressurizing.
(3) Cross flow first followed by dead end filtration. The cross-flow filtration is firstly carried out, when the feed liquid in the storage tank (105) is concentrated to a certain degree, the feed liquid is stopped being filled into the storage tank (105), and the dead-end filter (302) is started to process the concentrated liquid in the storage tank (105). When the storage tank (105) is substantially emptied of concentrate, dead-end filtration is stopped, the storage tank (105) is refilled with feed solution and cross-flow filtration is started. The cross flow and the dead end filtration are alternately carried out, so that the continuous filtration of the feed liquid can be realized.
Referring to embodiment (2), the cross-flow filtration and backwash process is turned on. When the feed liquid in the storage tank (105) is concentrated to a certain degree, the concentrated liquid in the storage tank (105) needs to be cleaned by the dead-end filter (302). The cross-flow feed valve (201), the cross-flow reflux valve (202) and the cross-flow discharge valve (206) are first closed, thereby isolating the cross-flow filtration system. Referring then to embodiment (1), the dead end filtration and backwash process is initiated, thereby performing repeated filtration backwash operations on the dead end filter until the concentrate in the holding tank (105) is emptied.
(4) Cross-flow + dead-end filtration. The cross-flow and dead-end filters can be started simultaneously, or the dead-end filter can be started after cross-flow filtration for a period of time. If the former mode of operation is adopted, the filtration steps in embodiments (1) and (2) can be referred to, with both filters being operated simultaneously. If the latter mode of operation is used, the cross-flow filtration (see the filtration step in embodiment (2)) is first started, and when the feed liquid in the storage tank (105) is gradually concentrated, the dead-end filtration (see the filtration step in embodiment (1)) is started to maintain the feed liquid concentration in the storage tank (105) so as not to be too high, and if the feed liquid concentration is too high, the cross-flow filtration has to be stopped and cleaned off-line. It should be noted that the backwashing setting modes of the two filters can be the same or different, when the two filters reach the backwashing condition at the same time, the mode of 'performing backwashing one by one after cross flow' is followed, and the backwashing steps are the same as those in the specific embodiments (1) and (2).
Claims (8)
1. An automatic filtering system mainly comprises six units, namely feed liquid storage, dead-end filtration, cross flow filtration, backwashing slag discharge, filtrate storage and automatic control;
the feed liquid storage unit (1) comprises a feed liquid inlet (101), a storage valve (102), a storage pump (103), an exhaust port (104), a storage tank (105), a liquid level meter (106), a discharge valve (107), a discharge port (108), a feed back valve (109), a flow transmitter (110), a pressure transmitter (111) and a feed pump (112);
before filtration, feed liquid is injected into a storage tank (105), and the liquid level of the storage tank (105) is automatically controlled through the opening and closing of a storage valve (102) and a storage pump (103) according to the feedback of a liquid level meter (106);
the cross-flow filtering unit (2) comprises a cross-flow feed valve (201), a cross-flow backflow valve (202), a cross-flow filter (203), a cross-flow discharge pressure transmitter (204), a cross-flow backwashing valve (205) and a cross-flow discharge valve (206);
the cross-flow filtration pumps feed liquid in a storage tank (105) into a cross-flow filter (203) through a feed pump (112), return liquid returns to the storage tank (105), filtrate enters a filtrate storage unit, and the cross-flow feed flow and the filtration pressure can be adjusted through the output power of the feed pump (112), a return valve (109), a cross-flow feed valve (201) and a cross-flow return valve (202);
the dead-end filtering unit (3) comprises a dead-end feeding valve (301), a dead-end filter (302), a dead-end discharging valve (303), a dead-end discharging pressure transmitter (304), a dead-end backwashing slag discharging valve (305), a slag discharging port (306), a filtrate flow transmitter (307), a filtrate flow control valve (308) and a dead-end backwashing valve (309);
the dead-end filtration is carried out, the feed liquid in the storage tank (105) is pumped into a dead-end filter (302) through a feed pump (112), the filtrate enters a filtrate storage unit, and the filtration pressure is adjusted through the output power of the feed pump (112), a feed back valve (109) and a dead-end feed valve (301);
the storage pump (103) and the feed pump (112) are directly connected through a four-way at the lower part of the storage tank (105), and fresh feed liquid can directly enter the cross-flow filter (203) through the feed pump (112).
2. The automatic filtration system of claim 1, wherein the backwash slag discharge unit (4) comprises a dead-end backwash exhaust valve (401), a backwash liquid control valve (402), a backwash gas control valve (403), a cross-flow backwash exhaust valve (404), an exhaust port (405), a backwash valve (406), a pressure gauge (407), a backwash medium inlet (408), a backwash tank (409), a backwash tank evacuation valve (410), a backwash tank evacuation port (411); the filtrate storage unit (5) mainly comprises an exhaust port (501), a filtrate tank (502), a filtrate feed valve (503), a liquid level meter (504), a filtrate discharge valve (505), a filtrate pump (506) and a filtrate outlet (507); the automatic control unit (6) comprises an automatic control and data acquisition module.
3. The automatic filtration system of claim 2 wherein the automatic control unit further provides a manual mode of operation, the automatic and manual modes being conveniently switched during operation and commissioning of the device.
4. The automatic filtration process of an automatic filtration system according to claim 2, wherein the timed backwashing means backwashing when the filtration time reaches a certain value; the constant-speed backwashing refers to backwashing when the output rate of the filtrate is lower than a set value; constant pressure backwashing refers to backwashing when the pressure difference between the feed side and the discharge side of the filter is higher than a set value.
5. The automatic filtration process of an automatic filtration system according to claim 2, wherein the gas backwashing is compressed gas backwashing, but before backwashing the gas permeable filter material, the filtrate on the discharge side of the filter and in the gas flow pipeline is also back-pressed and passes through the filter material; liquid backwashing means backwashing of backwash liquid through the filter material in the reverse direction; the gas-liquid backwashing means that liquid backwashing is carried out firstly and then gas backwashing is carried out in the backwashing process.
6. The automatic filtration process of claim 5, wherein the liquid backwash is a filtrate or other liquid.
7. The automatic filtration process of an automatic filtration system according to claim 1, wherein the stock pump (103) is omitted when the feed liquid is allowed to flow into the reservoir (105) by its own pressure.
8. The automatic filtration process of an automatic filtration system according to claim 1, comprising four filtration modes: dead end, cross flow, first cross flow and then dead end, cross flow plus dead end.
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Application publication date: 20200204 Assignee: KARAMAY YAOCHENG PETROLEUM TECHNOLOGY Co.,Ltd. Assignor: NANJING University OF TECHNOLOGY|GAOQ FUNCTIONAL MATERIALS Co.,Ltd. Contract record no.: X2023320000154 Denomination of invention: Automatic filtration system and process Granted publication date: 20221014 License type: Common License Record date: 20230626 |