CN111632425A - Automatic backwashing equipment and backwashing method for filter - Google Patents
Automatic backwashing equipment and backwashing method for filter Download PDFInfo
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- CN111632425A CN111632425A CN202010522761.9A CN202010522761A CN111632425A CN 111632425 A CN111632425 A CN 111632425A CN 202010522761 A CN202010522761 A CN 202010522761A CN 111632425 A CN111632425 A CN 111632425A
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- filter
- filter body
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- gas
- backflushing
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000011001 backwashing Methods 0.000 title claims description 55
- 239000007788 liquid Substances 0.000 claims abstract description 123
- 238000011010 flushing procedure Methods 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 45
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 39
- 239000000706 filtrate Substances 0.000 claims description 34
- 239000012535 impurity Substances 0.000 claims description 13
- 239000012071 phase Substances 0.000 claims description 12
- 239000007791 liquid phase Substances 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract description 12
- 230000008929 regeneration Effects 0.000 abstract description 6
- 238000011069 regeneration method Methods 0.000 abstract description 6
- 239000003245 coal Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 5
- 239000012065 filter cake Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention relates to the field of manufacturing of filtering equipment in the coal chemical industry, and discloses automatic back flushing equipment of a filter and a back flushing method thereof, wherein the automatic back flushing equipment of the filter comprises a filter body (1) with a filter element (2), the filter body is respectively connected with a pulse gas generator (5) and a back flushing pump (9), and the pulse gas generator inputs pulse gas into the filter body and forms pulse vortex inside the filter body; the backflushing pump is used for pumping the filter liquid into the filter body to form backflushing liquid and soaking the filter element in the backflushing liquid for backflushing; the filter body is provided with an output pipeline for discharging a gas-liquid mixture of the pulse gas and the backflushing liquid. According to the invention, under the conditions that an end cover at the top of the filter is not disassembled and the filter element is not required to be taken out, the filter liquid is directly used as the backflushing liquid to carry out backflushing on the filter element in the filter body, so that the online regeneration of the filter system is realized; short flushing time, simple operation, thorough cleaning, prolonged service life of the filter element and reduced operation cost of the equipment.
Description
Technical Field
The invention relates to filtering equipment in the coal chemical industry, in particular to automatic back-flushing equipment of a filter and a back-flushing method thereof.
Background
The filter is a device widely applied to the coal chemical industry, and is mainly used for removing residual impurities in solutions such as water or methanol. The poor methanol filter is a filter commonly used in the low-temperature methanol washing process of coal chemical industry and used for filtering impurities in a methanol solution, and because the impurities of the system are more, after the system is operated for a period of time, the impurities on the filter screen are gathered to form a filter cake. When the thickness of the filter cake is increased to a certain extent, the pressure difference at two sides of the filter plug rises to an alarm value, the filtering speed and the filtering effect are obviously reduced, and the normal operation of a process system and equipment can be seriously influenced.
In the prior art, a common poor methanol filter does not have a back washing function and cannot realize the on-line regeneration of a filtering system. The existing cleaning method of the filter element type filter comprises two methods: the first method is that when the pressure difference of the filter reaches a set value, the flange end cover at the top of the filter is opened, and the filter element is taken out for cleaning. Generally, the filter elements are backwashed and cleaned one by adopting steam, a high-pressure water gun, a brush and the like, or cleaned by an ultrasonic cleaner. Not only has long time consumption and large labor intensity, but also easily causes loss to the filter element, influences the service life of the filter element and increases the operation cost. The second is when the filter pressure difference reaches the setting value, with the stock solution drain, adopt gaseous blowback, because the penetrating area after the filter core takes off the cake when more than or equal to the bore of admitting air, gaseous beginning is walked the shortcut, lead to the filter cake to obtain sufficient power, make the filter cake die on the filter core surface, still need open filter top flange end cover, carry out manual cleaning, the blowback takes off the cake effect and is very poor, not only operate, overhaul intensity of labour is big, the clearance is not thorough, influence the normal operating of system, change the filter core moreover frequently, the expense is higher.
Therefore, it is a problem to be solved to develop a filter with a backwashing function, which can regenerate a filter system without disassembling a top end cover of the filter and taking out a filter element for cleaning.
Disclosure of Invention
The invention aims to overcome the problems of long time consumption, high labor intensity, incomplete cleaning, easy loss to a filter element, influence on the service life of the filter element and the like in the prior art, and provides automatic backwashing equipment of the filter and a backwashing method thereof, wherein the filter element in the filter body is directly backwashed by taking filtrate as backwash liquid through a pulse gas generator and a backwash pump which are respectively connected with the filter body under the conditions of not disassembling an end cover at the top of the filter and not taking out the filter element, so that the online regeneration of a filter system is realized; the washing time is short, the operation is simple, the cleaning is thorough, the filter element is not damaged, the service life of the filter element is prolonged, and the operation cost of the equipment is reduced.
In order to achieve the above object, an aspect of the present invention provides an automatic back-flushing apparatus for a filter, including a filter body having a filter element, the filter body being connected to a pulse gas generator and a back-flushing pump, respectively, the pulse gas generator inputting pulse gas into the filter body and forming a pulse vortex therein; the backflushing pump is used for pumping the filtrate into the filter body to form backflushing liquid and soaking the filter element in the backflushing liquid for backflushing; the filter body is provided with an output pipeline for discharging a gas-liquid mixture of the pulse gas and the backflushing liquid.
Preferably, the output pipeline is connected with a gas-liquid separator, the gas-liquid separator is provided with a gas phase output end and a liquid phase output end, the gas phase output end discharges gas separated by the gas-liquid separator, and the liquid phase output end is communicated with the backflushing liquid collecting tank.
Preferably, the filter body is respectively provided with a differential pressure transmitter, a liquid level transmitter and an overflow pipeline, the overflow pipeline is provided with a liquid level control valve for preventing the liquid level in the filter body from being too high, and the overflow pipeline is communicated with the backflushing liquid collecting tank.
Preferably, in a back flushing cleaning state, the volume occupied by the gas-liquid mixture in the filter body is less than or equal to 80-90% of the volume of the filter body; under the emptying state, the volume occupied by the gas-liquid mixture in the filter body is more than or equal to 10-15% of the volume of the filter body.
Preferably, a sewage discharge pipeline is arranged on the filter body, a sewage discharge control valve is arranged on the sewage discharge pipeline, and the sewage discharge pipeline is communicated with the backflushing liquid collecting tank.
Preferably, the automatic control device comprises an automatic controller, and the automatic controller is connected with the differential pressure transmitter and the liquid level transmitter on the filter body;
the filter body is respectively provided with a filtrate inlet pipeline and a filtrate outlet pipeline, the filtrate inlet pipeline is provided with an inlet control valve, the filtrate outlet pipeline is provided with an outlet control valve, and the inlet control valve and the outlet control valve are connected with the automatic controller;
the backflushing pump is connected with the filter body through a backflushing pipeline, a backflushing control valve is arranged on the backflushing pipeline, and the backflushing control valve is connected with the automatic controller.
Preferably, the filtrate is methanol, and the pulse gas is nitrogen.
The invention provides a backwashing method of the automatic filter backwashing equipment, which comprises the following steps:
step 100: inputting pulse gas into the filter body and forming pulse vortex in the filter body;
step 200: backflushing the filtrate into the filter body, so that the filter element in the filter body is backflushed through the pulse vortex under the soaking of the backflushing solution;
step 300: and after the backwashing is continuously carried out for a preset time, discharging the gas-liquid mixture in the filter body.
Preferably, the method further comprises the step 400 of:
and carrying out gas-liquid separation on the discharged gas-liquid mixture, discharging the separated gas-phase substances, collecting the separated liquid-phase substances, and discharging the impurities after back washing.
Preferably, the step 100 is preceded by the step 090:
and inputting the filtrate to be filtered into the filter body, intercepting impurities larger than the pore size of the filter screen in the filter element, and discharging the filtered clean filtrate from the filter body.
Preferably, the gas pressure range of the pulse gas in the step 100 is: 0.15-0.8 MPa.
Preferably, the step 200 further comprises:
when the filtering liquid is backflushed into the filter body and the gas-liquid mixture in the filter body is discharged, the liquid level in the filter body is monitored in real time, and when the liquid level reaches a threshold range, the backflushing of the filtering liquid or the discharge of the gas-liquid mixture is stopped.
Preferably, the filtered clean filtrate discharged from the filter body is back flushed into the filter body in step 200.
Preferably, the predetermined time in the step 300 is: the time it takes for the pressure differential within the filter body to recover below 25 kpa.
According to the technical scheme, under the conditions that an end cover at the top of the filter is not disassembled and a filter element does not need to be taken out, the filter liquid is directly used as the backflushing liquid to backflush the filter element in the filter body through the pulse gas generator and the backflushing pump which are respectively connected with the filter body, so that the online regeneration of the filter system is realized; the washing time is short, the operation is simple, the cleaning is thorough, the filter element is not damaged, the service life of the filter element is prolonged, and the operation cost of the equipment is reduced.
Drawings
Fig. 1 is a schematic view of the overall structure of an automatic filter backwashing apparatus according to an embodiment of the present invention.
Description of the reference numerals
1. A filter body; 2. a filter element; 3. a differential pressure transmitter; 4. a liquid level transmitter; 5. a pulse gas generator; 6. an automatic controller; 7. a backflushing liquid collecting tank; 8. a gas-liquid separator; 9. a back flushing pump; 10. a blowdown control valve; 11. an inlet control valve; 12. an outlet control valve; 13. a recoil control valve; 14. an air escape duct; 15. a gas phase outlet; 16. a liquid phase outlet valve; 17. a liquid level control valve; 18. a backwash liquid outlet valve.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.
As shown in fig. 1, in one aspect, the present invention provides an automatic back flushing apparatus for a filter, comprising a filter body 1 with a filter element 2, wherein the filter body 1 is connected to a pulse gas generator 5 and a back flushing pump 9, respectively, the pulse gas generator 5 inputs pulse gas into the filter body 1 and forms a pulse vortex inside the filter body; the backflushing pump 9 is used for pumping the filtrate into the filter body 1 to form backflushing liquid and soaking the filter element 2 in the backflushing liquid for backflushing; the filter body 1 is provided with an output pipeline for discharging a gas-liquid mixture of the pulse gas and the backflushing liquid. According to the invention, under the conditions that the top end cover of the filter is not disassembled and the filter element is not required to be taken out, the filter liquid is directly used as the back flushing liquid to back flush the filter element in the filter body through the pulse gas generator and the back flushing pump which are respectively connected with the filter body, so that the online regeneration of the filter system is realized; the washing time is short, the operation is simple, the cleaning is thorough, the filter element is not damaged, the service life of the filter element is prolonged, and the operation cost of the equipment is reduced.
Specifically, in order to further perform gas-liquid separation on a gas-liquid mixture output from the output pipeline, the output pipeline is connected with the gas-liquid separator 8, the gas-liquid separator 8 is provided with a gas-phase output end and a liquid-phase output end, the gas separated by the gas-liquid separator 8 is discharged through the gas-phase outlet 15 by the gas-phase output end, and the liquid-phase output end is communicated with the backflushing liquid collecting tank 7.
In order to ensure the backwashing effect and maintain the liquid level in the filter body 1 to be always at a safe position in the whole treatment process, the filter body 1 is respectively provided with a differential pressure transmitter 3, a liquid level transmitter 4 and an overflow pipeline, the overflow pipeline is provided with a liquid level control valve 17 for preventing the liquid level in the filter body 1 from being too high, and the overflow pipeline is communicated with the backwashing liquid collecting tank 7. Under the normal condition, in a back flushing cleaning state, the volume occupied by the gas-liquid mixture in the filter body 1 is less than or equal to 80-90% of the volume of the filter body 1; in the emptying state, the volume occupied by the gas-liquid mixture in the filter body 1 is more than or equal to 10-15% of the volume of the filter body 1.
In order to discharge sewage timely, a sewage discharge pipeline is arranged on the filter body 1, a sewage discharge control valve 10 is arranged on the sewage discharge pipeline, and the sewage discharge pipeline is communicated with the backflushing liquid collecting tank 7.
In order to prevent the pressure inside the filter body 1 from exceeding the standard, an air leakage pipeline 14 is arranged at the top of the filter body 1 and used for realizing air leakage protection on the filter body 1 when the pressure is too high.
In order to effectively control the cut-off and conduction of each pipeline, the automatic back-flushing equipment of the filter also comprises an automatic controller 6, wherein the automatic controller 6 is connected with the differential pressure transmitter 3 and the liquid level transmitter 4 on the filter body 1; a filtrate inlet pipeline and a filtrate outlet pipeline are respectively arranged on the filter body 1, an inlet control valve 11 is arranged on the filtrate inlet pipeline, an outlet control valve 12 is arranged on the filtrate outlet pipeline, and the inlet control valve 11 and the outlet control valve 12 are connected with the automatic controller 6; the backflushing pump 9 is connected with the filter body 1 through a backflushing pipeline, a backflushing control valve 13 is arranged on the backflushing pipeline, and the backflushing control valve 13 is connected with the automatic controller 6.
It should be noted that the automatic filter backwashing device provided by the present invention may be applied to various filtering liquids, and the pulse gas may also be various gases, in the embodiment shown in fig. 1, the filtering liquid is methanol (or water, ethylene glycol), and the pulse gas is nitrogen (or carbon dioxide, argon). In addition, the filter element 2 of the filter is generally cylindrical, and a mechanical screen, a ceramic membrane, or a sintered filter element may be used as the filter element 2.
In a second aspect, the present invention provides a backwashing method of an automatic filter backwashing apparatus as described above, which generally includes the steps of:
step 100: inputting pulse gas into the filter body to form pulse vortex in the filter body;
step 200: backflushing the filtrate into the filter body, so that the filter element in the filter body is backflushed through the pulse vortex under the soaking of the backflushing solution;
step 300: and after the backwashing is continuously carried out for a preset time, discharging the gas-liquid mixture in the filter body.
In order to facilitate recycling of the filtrate, the method further comprises step 400:
and carrying out gas-liquid separation on the discharged gas-liquid mixture, discharging the separated gas-phase substances, collecting the separated liquid-phase substances, and discharging the impurities after back washing.
Typically, the gas pressure range of the pulse gas in step 100 is: 0.15-0.8 MPa.
Since the same liquid is used for the backwash liquid and the filtrate, the backwash liquid can be directly performed after the filtration is completed, and therefore, the step 100 may further include the following step 090:
and inputting the filtrate to be filtered into the filter body, intercepting impurities larger than the pore size of the filter screen in the filter element, and discharging the filtered clean filtrate from the filter body.
More specifically, the step 200 further comprises:
when the filtering liquid is backflushed into the filter body and the gas-liquid mixture in the filter body is discharged, the liquid level in the filter body is monitored in real time, and when the liquid level reaches a threshold range, the backflushing of the filtering liquid or the discharge of the gas-liquid mixture is stopped.
In order to reduce the cost, the filtered clean filtrate discharged from the filter body is backflushed into the filter body in the step 200, thereby realizing the reuse of the filtrate.
The predetermined time in the step 300 is: the time it takes for the pressure differential within the filter body to recover below 25 kpa.
According to the automatic back washing equipment and the back washing method of the filter, pulse gas forms pulse kinetic energy and is sent into the filter body, and the filter element is back washed under the soaking of the filter liquid; back flushing liquid enters the filter from the side direction, forms vortex by utilizing kinetic energy, and physically washes the surface of the filter element to remove impurities under the dual actions of gas and liquid; the automatic control system is used for adjusting the backwashing process, and through the filtering stage, the backwashing liquid recovery stage and the automatic adjustment stage, the filter element of the filter is backwashed in the filter body, so that the filter element in the filter can be efficiently regenerated without disassembling the top end cover of the filter, and the problems of long time consumption, high operation and maintenance labor intensity, incomplete cleaning, easy damage to the filter element, influence on the service life of the filter element, increase of the operation cost and the like in the prior art are solved.
The backwashing method of the automatic filter backwashing device provided by the invention is described in detail with reference to fig. 1.
Firstly, a filtering stage is included: raw material methanol enters the filter body 1 through an inlet control valve 11 on the pipeline, impurities larger than the aperture of the filter screen are intercepted under the action of the filter element 2, and the filtered clean methanol is discharged through an outlet control valve 12 on the pipeline.
Secondly, entering a backwashing stage: the pulse gas generator 5 is adopted to generate pulse kinetic energy for the pulse nitrogen, pulse vortex is formed in the filter body 1, and the pulse vortex is conveyed into the filter body 1 through the pulse gas inlet. And starting the backflushing pump 9, conveying the backflushing liquid into the filter body 1 from the side direction through the backflushing liquid inlet by the backflushing pump 9 and a backflushing control valve 13 on the pipeline, and backflushing the filter element 2 in the filter body 1 under the soaking of methanol liquid.
Then, a backwash liquid recovery stage is carried out: and the liquid after back flushing is discharged into the gas-liquid separator 8 through a back flushing liquid outlet valve 18 on the pipeline through a back flushing gas-liquid outlet, and pulse gas and back flushing liquid are separated. The top gas phase of the gas-liquid separator is discharged through a gas phase outlet 15, and the bottom liquid phase outlet is conveyed into the backflushing liquid collecting tank 7 through a liquid phase outlet valve 16 to recover the flushing liquid. Meanwhile, a blowdown control valve at the bottom of the filter is communicated with the backflushing liquid collecting tank, and the methanol containing the slag is collected in the backflushing liquid collecting tank.
The process is realized through automatic adjustment, specifically, in practical application, when the pressure difference of the filter rises to an alarm value through a pressure gauge or a pressure transmitter, the pressure difference transmitter 3 outputs a pressure difference signal to the automatic controller 6, the automatic controller 6 outputs a control signal according to a preset program, the inlet control valve 11 and the outlet control valve 12 are closed, the recoil control valve 13 and the blowdown control valve 10 are opened to start flushing, and the liquid level of the filter cylinder is monitored through the liquid level transmitter 4. When the liquid level transmitter displays a full range, the blowdown control valve 10 is closed, the inlet control valve 11 is kept open, the blowdown control valve 10 is automatically opened after the backwashing device delays and pressurizes, reverse flushing explosive force is formed, and impurities accumulated on the surface of the filter element 2 of the filter are quickly flushed. The backwashing time can be determined according to the pressure recovery condition of the differential pressure transmitter 3, such as: when the differential pressure transmitter shows 25kpa below, that is: finishing the back washing; if still above 25kpa, the flushing is repeated until below 25kpa is reached. When the pressure of the differential pressure transmitter 3 is restored to normal, namely: and when the pressure is below 25kpa, the automatic controller 6 outputs a control signal, opens the inlet control valve 11 and the outlet control valve 12, closes the inlet control valve 11 and the blowdown control valve 10, ends the backwashing process of the filter element 2 and restarts the filtering.
In conclusion, the automatic back washing equipment for the filter and the back washing method thereof provided by the invention are reasonable in arrangement and easy to implement, can realize the on-line efficient regeneration of the filter element without disassembling the filter, reduce the operation and maintenance cost of the equipment and prolong the service life of the filter element; the requirements of water liquid backwashing and filtering can be met, and meanwhile, an automatic control system is adopted to automatically control the backwashing process, so that the human resources and the labor intensity are greatly reduced, and the working efficiency is improved; the liquid level in the filter and the backwashing time can be adjusted in the backwashing process, the operation is convenient, and the operation is stable.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the solution of the invention are possible, for example, methanol and nitrogen can be replaced by other filtrates and gases. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (15)
1. An automatic back-flushing device of a filter comprises a filter body (1) with a filter element (2), and is characterized in that the filter body (1) is respectively connected with a pulse gas generator (5) and a back-flushing pump (9), and the pulse gas generator (5) inputs pulse gas into the filter body (1) and forms a pulse vortex inside the filter body; the backflushing pump (9) is used for pumping the filtrate into the filter body (1) to form backflushing liquid and soaking the filter element (2) in the backflushing liquid for backflushing; the filter body (1) is provided with an output pipeline for discharging a gas-liquid mixture of the pulse gas and the backflushing liquid.
2. The automatic backwashing apparatus for filters of claim 1, wherein the output line is connected to a gas-liquid separator (8), the gas-liquid separator (8) having a gas phase output for discharging gas separated by the gas-liquid separator (8) and a liquid phase output for communicating with a backwashing liquid collection tank (7).
3. The automatic backwashing device of the filter of claim 1, wherein the filter body (1) is provided with a differential pressure transmitter (3), a liquid level transmitter (4) and an overflow pipe, the overflow pipe is provided with a liquid level control valve (17) for preventing the liquid level in the filter body from being too high, and the overflow pipe is communicated with the backwashing liquid collecting tank (7).
4. The automatic backwashing apparatus for filters of claim 1, wherein in a backwashing state, a volume occupied by the gas-liquid mixture in the filter body (1) is less than or equal to 80-90% of the volume of the filter body; in the emptying state, the volume occupied by the gas-liquid mixture in the filter body (1) is more than or equal to 10-15% of the volume of the filter body.
5. The automatic backwashing device of the filter of claim 2, wherein a blowdown pipe is arranged on the filter body (1), a blowdown control valve (10) is arranged on the blowdown pipe, and the blowdown pipe is communicated with the backwashing liquid collecting tank (7).
6. The automatic backwashing device of the filter of claim 3, comprising an automatic controller (6), wherein the automatic controller (6) is connected with the differential pressure transmitter (3) and the liquid level transmitter (4) on the filter body (1);
a filtrate inlet pipeline and a filtrate outlet pipeline are respectively arranged on the filter body (1), an inlet control valve (11) is arranged on the filtrate inlet pipeline, an outlet control valve (12) is arranged on the filtrate outlet pipeline, and the inlet control valve (11) and the outlet control valve (12) are connected with the automatic controller (6);
the backflushing pump (9) is connected with the filter body (1) through a backflushing pipeline, a backflushing control valve (13) is arranged on the backflushing pipeline, and the backflushing control valve (13) is connected with the automatic controller (6).
7. The automatic filter backwash apparatus according to claim 1, wherein the filtrate is methanol.
8. The automatic filter backwash apparatus according to claim 1, wherein the pulse gas is nitrogen gas.
9. A backwashing method of an automatic filter backwashing apparatus according to any of claims 1 to 8, comprising the steps of:
step 100: inputting pulse gas into the filter body and forming pulse vortex in the filter body;
step 200: backflushing the filtrate into the filter body, so that the filter element in the filter body is backflushed through the pulse vortex under the soaking of the backflushing solution;
step 300: and continuously performing back flushing and discharging the gas-liquid mixture in the filter body after the preset time is reached.
10. The backwashing method of the automatic filter backwashing apparatus according to claim 9, further comprising the step 400 of:
and carrying out gas-liquid separation on the discharged gas-liquid mixture, discharging the separated gas-phase substances, collecting the separated liquid-phase substances, and discharging the impurities after back washing.
11. The backwash method of automatic filter backwash equipment as defined in claim 9, wherein said step 100 is preceded by the step 090 of:
and inputting the filtrate to be filtered into the filter body, intercepting impurities larger than the pore size of the filter screen in the filter element, and discharging the filtered clean filtrate from the filter body.
12. The backwashing method of the automatic filter backwashing apparatus according to claim 9, wherein the gas pressure of the pulse gas in the step 100 is in a range of: 0.15-0.8 MPa.
13. The backwash method of filter automatic backwash equipment as claimed in claim 9, wherein said step 200 further comprises:
when the filtering liquid is backflushed into the filter body and the gas-liquid mixture in the filter body is discharged, the liquid level in the filter body is monitored in real time, and when the liquid level reaches a threshold range, the backflushing of the filtering liquid or the discharge of the gas-liquid mixture is stopped.
14. The backwash method of filter automatic backwash equipment as claimed in claim 11, wherein the filtered clean filtrate discharged from the filter body is backwashed into the filter body in the step 200.
15. The backwashing method of said automatic filter backwashing apparatus according to claim 9, wherein said predetermined time in said step 300 is: the time it takes for the pressure differential within the filter body to recover below 25 kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010522761.9A CN111632425A (en) | 2020-06-10 | 2020-06-10 | Automatic backwashing equipment and backwashing method for filter |
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|---|---|---|---|
| CN202010522761.9A CN111632425A (en) | 2020-06-10 | 2020-06-10 | Automatic backwashing equipment and backwashing method for filter |
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| CN111632425A true CN111632425A (en) | 2020-09-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114768352A (en) * | 2022-05-20 | 2022-07-22 | 青岛高测科技股份有限公司 | Automatic cleaning method for cutting fluid circulating system of wire cutting machine |
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|---|---|---|---|---|
| CN114768352A (en) * | 2022-05-20 | 2022-07-22 | 青岛高测科技股份有限公司 | Automatic cleaning method for cutting fluid circulating system of wire cutting machine |
| CN115090018A (en) * | 2022-06-30 | 2022-09-23 | 重庆海浦洛自动化科技有限公司 | Backwashing filtering method |
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