CN214130452U

CN214130452U - Filter press system for improving dryness of filter cake

Info

Publication number: CN214130452U
Application number: CN202022939327.9U
Authority: CN
Inventors: 钟新钢; 阮宇科; 许俊荣
Original assignee: Zhejiang Larok Filtration Technology Co ltd
Current assignee: Zhejiang Larok Filtration Technology Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-09-07
Anticipated expiration: 2030-12-07

Abstract

The utility model provides an improve pressure filter system of filter cake quality, including the pressure filter, the import of this pressure filter's air-dry passageway loops through heating device, dewatering device and gas tank connection, still is connected with the air compressor machine on the gas holder. The utility model discloses a before compressed air got into the pressure filter, carry out dewatering treatment earlier, get rid of the moisture that self has as far as possible. The dehydrated compressed air is subjected to temperature rise treatment to further reduce the dew point, so that the capacity of the compressed air for replacing the water in the filter cake is further expanded. Adopt the utility model discloses air-dry the filter cake, improved the filter cake dryness factor greatly.

Description

Filter press system for improving dryness of filter cake

Technical Field

The utility model relates to a pressure filter technical field, especially a pressure filter system of improvement filter cake dryness fraction.

Background

The filter plates of the filter press are usually chamber filter plates, diaphragm filter plates, etc. As disclosed in chinese patent CN108786201, a plate for a filter press, use of a filter press and a filter press cleaning method, two filter plates of different structures are alternately installed. One is a box-type filter plate with a feeding pipeline, a main body of the box-type filter plate is made of a steel plate, modified polyethylene plastic lining plates with vertical grooves are arranged on two sides of the steel plate, and the grooves are used for smoothly guiding filtrate water into a liquid discharge pipe at the lower part of the filter plate to flow out; the other type is called a diaphragm filter plate, the main body of the diaphragm filter plate is also a steel plate, and rubber squeezing diaphragms with elasticity are arranged on two sides of the steel plate. Specially-made filter cloth is hung and installed on both sides of the two filter plates; the side of the rubber diaphragm facing the filter chamber is provided with small bosses which are densely distributed, so that filtered filtrate water can conveniently flow into a liquid discharge pipe at the lower part of the filter plate. In the working process of the filter press, the two filter plates which are alternately arranged are pressed together to form a filter chamber between the adjacent filter plates, after the filter chamber is filled with the filtered materials, high-pressure air is blown between the diaphragm of the diaphragm filter plate and the filter plate main body to drive the rubber diaphragm to deform, so that the filter cake (namely the filtered materials in the filter chamber) is extruded, and redundant water in the filter cake is squeezed out, so that the filter cake meets the requirement of lower water content.

In general, in order to increase the dryness of filter cake in a filter press, it is carried out by a method such as increasing the feed pressure or increasing the diaphragm pressure, and if necessary, the filter cake is blown to further increase the dryness of the filter cake. However, as a result of the implementation of both methods, the filter cloth is more tightly attached to the filtering surface of the filter plate, and the filter cake is pressed more tightly; the resistance of the subsequent blowing operation is very large, the channel is not smooth, the air flow rate is very low, the efficiency is very low, and the effect is not obvious; it becomes exceptionally difficult to displace water between the filter cake particles by air after the filter cake is compacted.

SUMMERY OF THE UTILITY MODEL

The invention aims at providing a filter press system for improving the dryness of a filter cake, when the filter press air-dries the filter cake, compressed air firstly carries out dehydration treatment and heating treatment and then enters the filter press, the air-drying effect of the compressed air is greatly improved, and the dryness of the filter cake is obviously improved.

In order to achieve the above object, the utility model provides an improve pressure filter system of filter cake dryness fraction, including the pressure filter, the import of this pressure filter's air-dried passageway loops through heating device, dewatering device and gas tank connection, still is connected with the air compressor machine on the gas holder. The utility model discloses a before compressed air got into the pressure filter, carry out dewatering treatment earlier, get rid of the moisture that self has as far as possible. The dehydrated compressed air is subjected to temperature rise treatment to further reduce the dew point, so that the capacity of the compressed air for replacing the water in the filter cake is further expanded. Adopt the utility model discloses air-dry the filter cake, improved the filter cake dryness factor greatly.

Preferably, a diaphragm filter plate is arranged in the filter press, the diaphragm filter plate comprises a core plate, a squeezing membrane and filter cloth, and the inlet of a squeezing cavity of the filter press is connected with a water tank through a squeezing water pump; the squeezing water pump is connected with a low-pressure stabilizing device. The low-pressure stabilizing device can control the squeezing water pump to operate at low pressure for a long time, keep the posture of the squeezing diaphragm just bulging, and perform air drying operation by adopting a low-pressure pre-squeezing maintaining mode, so that the phenomenon that the filter plate is cracked and collapsed after being squeezed by the diaphragm and the compressed air is short-circuited is prevented. Can be air-dried for a long time, and further improves the dryness of the filter cake.

A flow channel film is supported between the pressing film and the filter cloth, and a main flow channel communicated with the air drying channel is formed between the flow channel film and the pressing film; the flow passage film is provided with a small through hole in the thickness direction. The small through holes on the flow passage membrane have the pore size far larger than the filter holes on the filter cloth, so that the flow passage membrane can keep certain rigidity and has certain thickness, thereby enabling the air drying channel to be always kept smooth and obviously improving the dryness of filter cakes.

Preferably, the filter press is provided with a chamber type filter plate; the box-type filter plate comprises a core plate and filter cloth, wherein a flow passage film is supported between the core plate and the filter cloth, and a main flow passage communicated with an air drying passage is formed between the flow passage film and the core plate. The box-type filter plates are low in cost and can be alternately arranged with the diaphragm filter plates according to requirements, and the cost of the whole filter press is greatly reduced.

Preferably, the surface of the core plate of the chamber filter plate is provided with a plurality of small bosses. The small boss plays a supporting role and can also enhance the effect of extruding filter cakes.

Preferably, a plurality of supporting protrusions are arranged on one side, facing the filter cloth, of the flow channel membrane. The supporting bulge has the function of supporting the filter cloth, and the effect of extruding the filter cake can be enhanced.

Preferably, the surface of the side, facing the flow passage membrane, of the pressing membrane of the diaphragm filter plate is provided with a plurality of small bosses. The small boss plays a supporting role and can also enhance the effect of extruding filter cakes.

As mentioned above, the utility model relates to an improve pressure filter system of filter cake dryness fraction has following beneficial effect:

1. the filter press consisting of the filter plates with the flow channel membranes can ensure that a filtrate channel and an air drying channel are smooth and unimpeded no matter how high the feeding pressure or the squeezing pressure is, and the dryness of filter cakes is greatly improved.

2. Before the compressed air enters the filter press, dehydration treatment is carried out, moisture carried by the compressed air is removed as much as possible, and the dryness of the filter cake is further improved.

3. The dehydrated compressed air is subjected to temperature rise treatment to further reduce the dew point, so that the capacity of the compressed air for replacing the water in the filter cake is further expanded, and the dryness of the filter cake is further improved.

4. In order to prevent the filter plate from cracking and collapsing after being squeezed by the diaphragm, compressed air short circuit occurs; the air drying operation is carried out by maintaining low-pressure pre-squeezing, so that the dryness of the filter cake can be further improved.

5. The filter press can perform cross reverse operation of filtering and air drying by switching the external pipeline valve of the filter press, and further improves the dryness of the filter cake.

Drawings

Fig. 1 is a schematic structural view of a box-type filter plate of the present invention;

fig. 2 is a schematic structural view of the diaphragm filter plate of the present invention;

FIG. 3 is a schematic structural view of the present invention;

fig. 4 is a schematic view of the filter plate assembly structure of the present invention.

Description of reference numerals:

a core board 1; a flow channel film 2; a support protrusion 21; a small through hole 22; a filter cloth 3; a main flow passage 4; an air drying channel 5; a press film 6; a pressing chamber 7; a small boss 8; a filter cake 9; a feed channel 10; a pressing chamber inlet 11; a filter press 31; a heating device 32; a dehydration device 33; an air reservoir 34; an air compressor 35; a squeeze water pump 36; a water tank 37 and a low-pressure stabilizing device 38.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.

As shown in fig. 1 to 4, the utility model discloses an improve pressure filter system of filter cake dryness fraction, including pressure filter 31, this pressure filter 31 squeeze the chamber import 11 and be connected with water tank 37 through squeezing water pump 36, squeeze water pump 36 and be connected with low pressure regulator 38. An inlet of an air drying channel 5 of the filter press 31 is connected with an air storage tank 34 through a heating device 32 and a dehydration device 33 in sequence, and the air storage tank 34 is also connected with an air compressor 35.

The filter press 31 is provided with a membrane filter plate, which comprises a core plate 1, a press membrane 6 and filter cloth 3, and a press cavity 7 is arranged between the core plate 1 and the press membrane 6, as shown in fig. 2. A flow channel membrane 2 is supported between the pressing membrane 6 and the filter cloth 3, and a main flow channel 4 communicated with the air drying channel 5 is formed between the flow channel membrane 2 and the pressing membrane 6; the flow path membrane 2 has a small through hole 22 formed therethrough in the thickness direction. A plurality of supporting protrusions 21 are arranged on one side of the flow passage membrane 2 facing the filter cloth 3. The support protrusions 21 serve to support the filter cloth 3 and also enhance the effect of pressing the filter cake. The small through holes 22 allow the filtrate collected between the struts to smoothly flow to the main channel 4. The small through holes 22 are used for passing compressed air, filtrate and washing liquid. The surface of one side of the pressing membrane 6 of the diaphragm filter plate, which faces the flow passage membrane 2, is provided with a plurality of small bosses 8. The flow channel film 2 may have more than two layers, and a sub-flow channel is formed between two adjacent flow channel films 2 and is communicated with the main flow channel 4.

As shown in fig. 4, in the present embodiment, a mode in which the membrane filter plates and the chamber filter plates are alternately arranged is adopted. The filter press can also adopt the structure of a full-diaphragm filter plate. As shown in fig. 1, the chamber filter plate comprises a core plate 1 and filter cloth 3, a flow passage membrane 2 is supported between the core plate 1 and the filter cloth 3, and a main flow passage 4 communicated with an air drying passage 5 is formed between the flow passage membrane 2 and the core plate 1. The surface of the core plate 1 of the chamber filter plate is provided with a plurality of small bosses 8.

The runner membrane 2 of the utility model can be manufactured by a plurality of methods such as pressing, injection molding, sintering, weaving, welding and golden cutting.

The connection between the runner film 2 and the core plate 1 of the utility model can be realized by various methods such as hot melting, fastening, welding, bonding and the like.

The core plate 1 and the runner film 2 can be made of metal, plastic, rubber and the like.

The core plate 1 of the utility model can be a conventional filter plate or a non-filtering core plate with only a supporting mechanism.

As shown in fig. 1, the two air drying passages 5 at the upper part of the filter plate are used as compressed air inlets, and the two air drying passages 5 at the lower part of the filter plate are used as compressed air outlets.

As shown in fig. 3 and 4, the operating principle is as follows: the air arrows in fig. 4 represent the direction of flow of the suspension, and the solid arrows represent the direction of air drying. The suspension enters the filter chamber through the feed inlet 40, and with the gradual increase of the feed pressure, the filtrate penetrates through the filter cloth 3 and enters the narrow space between the flow channel membrane 2 and the filter cloth 3, and since the liquid flows preferentially from the place with small resistance, most of the filtrate passes through the small through holes 22 of the flow channel membrane 2, enters the main flow channel 4 between the flow channel membrane 2 and the filter plate 1, and flows to the air drying channel 5 below and is discharged. The solid particles are piled up to form a filter cake 9, and as the suspension continuously enters the filter chamber, the filter cake 9 fills the filter chamber, and the filtration is finished. Then, the filter plates are separated, and the filter cakes 9 can be discharged by the gravity of the filter plates.

After the filter press filtration is finished, the filter cake is air-dried to further improve the dryness of the filter cake. Starting an air compressor 35, leading out compressed air in an air storage tank 34, firstly entering an air dehydration device 33 (generally a freeze dryer), introducing the dry air with water removed into an air heating device 32 (a heat exchanger or a water bath system or an oil bath device), heating the compressed air to a certain temperature (generally less than 80 ℃), leading the dry and hot air to enter a filter press 31 from an air drying channel 5 inlet above a filter plate in sequence, and purging a second filter cake and penetrating the filter cake through valve switching and proper filter plate flow passage arrangement of the filter press, so as to rapidly realize filter cake drying; the purging duration, the air pressure and the temperature are correspondingly adjustable.

Since the filter cake 9 is reduced in thickness after being pressed by the press membrane 6, the filter cake is easily cracked or collapsed when the pressing pressure is removed. Thus, when air drying is carried out, compressed air generates short circuit, and the drying effect is poor. The utility model can press the filter cake 9 at the lowest pressure by methods such as frequency conversion control of the pressing water pump 6, and can not crack or collapse; the filter cake 9 is ensured to be uniformly blown, the efficiency is greatly improved, and the energy consumption is reduced.

As shown above, the utility model discloses an improve pressure filter system of filter cake dryness fraction, rational in infrastructure, convenient operation, air-dry resistance little, do not have the dead angle, air-dry the means many, can improve the dryness fraction of filter cake greatly.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A filter press system for increasing the dryness of a filter cake, comprising a filter press (31), characterized by: the inlet of an air drying channel (5) of the filter press (31) is connected with an air storage tank (34) sequentially through a heating device (32) and a dewatering device (33), and the air storage tank (34) is further connected with an air compressor (35).

2. The filter press system according to claim 1, wherein the filter press system comprises: a diaphragm filter plate is arranged in the filter press (31), the diaphragm filter plate comprises a core plate (1), a squeezing membrane (6) and filter cloth (3), and a squeezing cavity inlet (11) of the filter press (31) is connected with a water tank (37) through a squeezing water pump (36); the squeezing water pump (36) is connected with a low-pressure stabilizing device (38).

3. The filter press system according to claim 2, wherein the filter press system comprises: a flow channel film (2) is supported between the pressing film (6) and the filter cloth (3), and a main flow channel (4) communicated with the air drying channel (5) is formed between the flow channel film (2) and the pressing film (6); the flow channel film (2) is provided with a through small through hole (22) in the thickness direction.

4. The filter press system according to claim 2, wherein the filter press system comprises: the surface of one side of the pressing membrane (6) of the diaphragm filter plate, which faces the flow passage membrane (2), is provided with a plurality of small bosses (8).

5. A filter press system according to claim 1 or 2 wherein the filter cake dryness is increased by: the filter press (31) is provided with a box-type filter plate; the van-type filter plate comprises a core plate (1) and filter cloth (3), a flow channel membrane (2) is supported between the core plate (1) and the filter cloth (3), and a main flow channel (4) communicated with an air drying channel (5) is formed between the flow channel membrane (2) and the core plate (1).

6. The filter press system according to claim 5, wherein the filter press system comprises: the surface of the core plate (1) of the chamber filter plate is provided with a plurality of small bosses (8).

7. The filter press system according to claim 3 or 4, wherein the filter press system comprises: and a plurality of supporting protrusions (21) are arranged on one side of the flow passage membrane (2) facing the filter cloth (3).