CN212632012U - Automatic back flushing equipment for filter - Google Patents

Abstract

The utility model relates to the field of manufacturing of filtering equipment in the coal chemical industry, and discloses automatic backwashing equipment for a filter, which comprises a filter body (1) with a filter element (2), wherein the filter body is respectively connected with a pulse gas generator (5) and a backwashing 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. The utility model directly uses the filtrate as the backwash liquid to backwash the filter element in the filter body without disassembling the top end cover of the filter and taking out the filter element, thereby realizing the on-line regeneration of the filter system; short flushing time, simple operation, thorough cleaning, prolonged service life of the filter element and reduced operation cost of the equipment.

Description

Automatic back flushing equipment for filter

Technical Field

The utility model relates to a coal chemical industry filtration equipment specifically relates to automatic back flush equipment of filter.

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.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the problems of long time consumption, large labor intensity, incomplete cleaning, easy loss to the filter element, influence on the service life of the filter element and the like in the prior art, and providing automatic back washing equipment of the filter; 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 purpose, the utility model provides an automatic back washing device of a filter, which comprises a filter body with a filter element, wherein the filter body is respectively connected with a pulse gas generator and a back washing pump, 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 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.

Through the technical scheme, the utility model directly uses the filtrate 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 under the condition that the top end cover of the filter is not disassembled and the filter element is not required to be taken out, thereby realizing the on-line regeneration of the filter system; 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 an 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 the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" generally means upper, lower, left, and right as illustrated with reference to the accompanying drawings; "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, an aspect of the present invention provides an automatic back-flushing device 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 above, the filter system can be used for backwashing the filter element in the filter body directly by using the filtrate as the backwashing liquid through the pulse gas generator and the backwashing pump which are respectively connected with the filter body 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, 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 back-washing device for the filter provided by the present invention can be applied to various filtering liquids, and the pulse gas can also be various gases, in the embodiment shown in fig. 1, the filtering liquid is methanol (or water or ethylene glycol), and the pulse gas is nitrogen (or carbon dioxide or 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.

The backwashing process of the automatic backwashing equipment for the filter integrally comprises the following steps:

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 the recycling of the filtrate, the method further comprises the 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 above, the utility model provides an automatic back washing device for filter, which forms pulse kinetic energy into pulse gas and sends the pulse kinetic energy into the filter body, and back washing the filter element under the soaking of the filtering 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 process 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 summary, the automatic back washing device of the filter provided by the utility model is reasonable in arrangement and easy to implement, can realize the on-line high-efficiency regeneration of the filter element without disassembling the filter, reduces the operation and maintenance cost of the device, and prolongs 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 with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical concept scope of the present invention, the present invention can be modified in various ways, for example, methanol and nitrogen can be replaced by other filtering liquid and gas. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims (8)

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 2, 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.

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