CN111957084A - Efficient energy-saving filter press and squeezing and filtering method based on filter press - Google Patents

Abstract

The invention discloses a high-efficiency and energy-saving filter press and a pressing and filtering method based on the filter press. The filter press includes a plurality of diaphragm plates and a plurality of filter plates alternately arranged on the frame, and a filter chamber capable of pressing and filtering the slurry is formed between the adjacent diaphragm plates and the filter plates, and each filter chamber is provided with a filter chamber. Filter cloth, these plates and frames are provided with at least one feeding channel, at least one filtrate channel and at least one extrusion channel. The filter chambers are communicated, and the extrusion channel is communicated with each pressure chamber through the corresponding drainage channels; these plates and frames are also provided with at least one gas drying channel capable of introducing compressed air into each filter chamber during the pressing and filtering process, and the gas drying channel It communicates with each filter cavity through the corresponding air-inducing channel. The invention can efficiently and reliably improve the dryness of the pressed filter cake, and at the same time, can greatly shorten the pressing and filtering cycle, and is efficient, energy-saving and economical.

Description

A high-efficiency and energy-saving filter press and a pressing and filtering method based on the filter press

technical field

The invention relates to a filter press for solid-liquid separation, in particular to a high-efficiency and energy-saving filter press, and a pressing and filtering method based on the filter press.

Background technique

Filter press is an important solid-liquid separation equipment used in industrial production. It is widely used in technical fields such as wastewater, chemical industry, food, metallurgy, and pharmaceuticals. The plate and frame filter press is a common type of filter press structure.

The plate and frame filter press is mainly composed of a frame, a plurality of diaphragm plates and filter plates arranged alternately on the frame (that is, the diaphragm plates and filter plates are arranged in an alternating sequence), and adjacent ones. The filter cloth between the diaphragm plate and the filter plate is composed of a filter cavity that can press and filter the slurry. The side of the diaphragm plate corresponding to the filter plate is made of a flexible diaphragm (such as rubber membrane, etc.) to form a pressure chamber that can squeeze the filter chamber. In general, these plates and frames (including each diaphragm plate and each filter plate) of the aforementioned filter press are respectively provided with a feeding channel at the upper corners, a filtrate channel at the lower corners, and a filtrate channel at the lower center. An extrusion channel, each liquid inlet channel, each filtrate channel and each extrusion channel are assembled according to the order after the plates and frames are closed (for example, a liquid inlet channel hole section on the diaphragm plate and a hole on the adjacent filter plate. The hole sections of the liquid inlet channel are axially butted, so that the corresponding liquid inlet channel hole sections on all the plates and frames are axially butted to form a complete liquid inlet channel; the same is true for other channels); each feeding channel passes through the corresponding distribution hole ( The distribution channel can be formed on the diaphragm plate, on the filter plate, or formed on the diaphragm plate and the filter plate respectively) and communicate with each filter cavity respectively, and each filtrate channel passes through the corresponding liquid introduction channel (the liquid introduction channel). The channels can be formed on the diaphragm plate, on the filter plate, or on the diaphragm plate and the filter plate respectively) and communicate with each filter cavity respectively, and the extrusion channel passes through the corresponding drainage channel (the drainage channel is formed on the diaphragm plate. top) communicate with each pressure chamber respectively. The work process of pressing and filtration is that each plate and frame is sequentially closed to form multiple filter chambers; the slurry is arranged in each filter chamber through the liquid inlet channel; the fluid medium (such as compressed air or water, etc.) is passed through the extrusion channel. It is introduced into each pressure chamber to expand the flexible diaphragm and squeeze the slurry in the corresponding filter chamber; the filtrate squeezed out of each filter chamber is output through the filtrate channel; after the pressing and filtration are completed, each plate frame is pulled open in turn to open The corresponding filter chamber realizes the unloading of slag; in this way, a filtering and pressing work process is completed.

The pressing and filtering effect of the filter press with the above structure is achieved by the pressing force of the pressure chamber on the diaphragm plate, and the pressing force of the pressure chamber is determined by the inlet pressure of the fluid medium, the deformation of the flexible diaphragm, and the cooperation between the filter chamber and the flexible diaphragm. Due to the relationship and many other factors, it is difficult to achieve high dryness pressing of the filter cake in the filter chamber, which makes the solid-liquid separation effect poor, the liquid content of the filter cake is high, the pressing and filtration cycle is long, and the economy is poor.

SUMMARY OF THE INVENTION

The technical purpose of the present invention is: aiming at the particularity of the above-mentioned plate-and-frame filter press and the deficiencies of the prior art, to provide a filter that can make the pressure chamber on the compressed air auxiliary diaphragm plate press and filter the filter cake in the filter chamber. A high-efficiency and energy-saving filter press, and a pressing filtration method based on the filter press.

The technical purpose of the present invention is achieved through the following technical solutions: a high-efficiency and energy-saving filter press, comprising multiple diaphragm plates and multiple filter plates alternately arranged on a frame, and formed between adjacent diaphragm plates and filter plates A filter cavity capable of squeezing and filtering slurry, each filter cavity is provided with a filter cloth, and at least one feed channel, at least one filtrate channel and at least one extrusion channel are provided on these plates and frames, and the feed channel passes through the corresponding The distribution channel is communicated with each filter cavity respectively, the filtrate channel is communicated with each filter cavity respectively through the corresponding liquid drainage channel, and the extrusion channel is communicated with each pressure cavity through the corresponding drainage channel respectively; these plates and frames are also provided with At least one gas drying channel capable of introducing compressed air into each filter cavity during the pressing and filtration process, and the gas drying channel is respectively communicated with each filter cavity through the corresponding air-inducing holes.

As one of the preferred solutions, the filtrate channels are at least two independent of each other, and one of the filtrate channels doubles as a gas drying channel.

As one of the preferred solutions, several protrusions are formed on the extrusion working surface of the flexible diaphragm of the diaphragm plate, and drainage slots are formed between adjacent protrusions; channel filter. Further, the protrusions on the extrusion working surface of the flexible diaphragm are composed of a plurality of large-diameter protrusions and a number of small-diameter protrusions, the large-diameter protrusions are arranged in the non-edge area of the flexible diaphragm, and the small-diameter protrusions are The protrusions are arranged in the edge region of the flexible membrane and in the region between the protrusions of major diameters.

As one of the preferred solutions, the filter cloth arranged in the filter chamber composed of the diaphragm plate and the filter plate is a double-layer structure, the two layers of filter cloth are used for distributing slurry, and one side of the filter cloth corresponds to the diaphragm plate. , The other side of the filter cloth corresponds to the matching filter plate. Further, the filter cloth in the filter chamber and the filter cloths in the other filter chambers are discontinuous and independent structures. The double-layer structure filter cloth in the filter cavity is composed of two sides hanging on the strut and hanging down.

A pressing and filtering method based on the above-mentioned high-efficiency and energy-saving filter press, the technical measures taken by the pressing and filtering method are:

In the second half of the process of pressing and filtering the slurry in the filter chamber, keep the pressure chamber of the diaphragm plate to continue to squeeze and do work, and pass the compressed air into the gas drying channel, so that the compressed air can extrude the filter cake in the filter chamber by wind force. Dry treatment.

As one of the preferred solutions, the technical measures taken by the pressing and filtering method are:

- there are at least two mutually independent filtrate channels on the filter press;

-In the second half of the process of pressing and filtering the slurry in the filter chamber, keep the pressure chamber of the diaphragm plate to continue to squeeze and do work, and pass compressed air into one of the filtrate channels, so that the compressed air can wind the filter cake in the filter chamber. Extrusion drying;

- The remaining filtrate channels maintain the filtrate output function.

As one of the preferred solutions, the introduction of the compressed air is at the remaining 1/2-1/4 time course of the pressing and filtering process.

The beneficial technical effects of the present invention are:

1. The present invention is aimed at the plate-and-frame filter press, and on its original structure, a gas drying channel that can be communicated with each filter chamber is formed, so that in the process of pressing and filtering, the gas drying channel can be passed to each filter chamber. Compressed air is introduced, so that the compressed air entering the filter chamber can assist the pressure chamber of the diaphragm plate to press and dry the filter cake in the filter chamber, that is, on the basis of the original diaphragm plate pressure chamber extrusion treatment, it is supplemented by wind extrusion. Press-drying treatment can effectively and reliably improve the dryness of the pressed filter cake, effectively enhance the solid-liquid separation effect, and at the same time can greatly shorten the pressing and filtration cycle, with high efficiency and energy saving, economical and practical; in addition, through compressed air Extrusion and drying of the filter cake can make the filter cake relatively loose in the filter cavity, which is helpful for subsequent efficient slag discharge treatment;

2. In the present invention, one of the multiple filtrate channels of the plate-and-frame filter press is also used as a gas drying channel, and there is no need to set up a gas drying channel for the plate and frame, which is simple in structure and low in manufacturing cost (only the filtrate that doubles as a gas drying channel is The channel can be connected to the compressed air system by switching the valve), which is not only suitable for the renovation of the filter press in service, but also for the molding of the new filter press; in this way, all filtrate channels can be activated when a large flow of filtrate is required. , when the compressed air needs to be introduced for wind extrusion drying treatment, the filter cake can be effectively squeezed through the compressed air, and the operation is flexible and convenient;

3. The flexible diaphragm structure of the diaphragm plate of the present invention and the filter screen structure on one side of the filter plate help the compressed air to enter the filter cavity efficiently and fully, and the filter cake in the filter cavity can be efficiently and fully discharged. Air-driven drying treatment ensures that the filtrate to be squeezed can flow efficiently and smoothly, and the efficiency and energy saving are more prominent; in addition, the large and small protrusions on the flexible diaphragm cooperate with the structure to effectively ensure the smooth flow of compressed air and filtrate. smooth flow;

4. The double-layer filter cloth structure in the filter chamber of the present invention helps the compressed air to enter the filter chamber efficiently and fully, and the filter cake in the filter chamber is subjected to efficient and sufficient wind extrusion drying treatment, At the same time, it ensures that the pressed filtrate can flow efficiently and smoothly, and the efficiency and energy saving are more prominent; in addition, it helps to achieve efficient slag unloading treatment in the future;

5. The pressing and filtering method of the present invention is aimed at the plate-and-frame filter press of the present invention, which introduces compressed air in the second half of the pressing and filtering of the diaphragm plate pressure chamber to perform wind extrusion drying on the filter cake in the filter chamber, thereby Effectively eliminates the premature introduction of compressed air to the slurry that does not form a filter cake in the filter chamber, the extrusion force of the pressure chamber, and the interference to the smooth flow of the large-flow filtrate. The filter cake with less flow rate of filtrate will be subjected to efficient and sufficient wind extrusion drying; in the process, the pressure chamber forms a supporting effect on the filter cake while extruding, so as to prevent the pressure chamber from being relieved due to pressure relief. The space of the filter cavity changes abruptly in the state of the filter cake, and the compressed air waste caused by the invalid work of the compressed air in the state of the filter cake is scattered, which is efficient and energy-saving;

6. In the pressing and filtering method of the present invention, one of the filtrate channels is also used as a gas drying channel, so that when the large-flow filtrate in the first half of the pressing and filtering is filtered out, the filtrate is efficiently discharged by all filtrate channels; When the low-flow filtrate is filtered out, compressed air is introduced into one of the filtrate channels to assist the pressure chamber to efficiently squeeze the filter cake in the filter chamber, so that the liquid contained in the filter cake can be discharged quickly and fully, with good efficiency and greatly shortened time. The press filter process is adopted, and the economy is excellent.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of the diaphragm plate in FIG. 1 .

FIG. 3 is a schematic structural diagram of the filter plate in FIG. 1 .

The meaning of the code in the figure: 1—diaphragm plate; 101—flexible diaphragm; 102—protrusion; 2—filter plate; 3—filter cloth; 4—strut; 5—filter screen; 6—filter cake; 7—feed channel ; 8—extrusion channel; 9—filtrate channel one; 10—liquid introduction channel one; 11—filtrate channel two; 12—liquid introduction channel two.

Detailed ways

The present invention relates to a filter press for solid-liquid separation, in particular to a high-efficiency and energy-saving filter press, and a press filtration method based on the filter press. The main technical content of the present invention will be described in detail below with several embodiments. . Among them, Embodiment 1 clearly and detailedly explains the content of the technical solution of the present invention in conjunction with the accompanying drawings in the description—that is, FIGS. 1, 2 and 3. Although other embodiments do not draw separate drawings, their main structures can still refer to the implementation. Attached to Example 1.

It should be noted here that the accompanying drawings of the present invention are schematic, and unnecessary details have been simplified for the purpose of clarifying the technical purpose of the present invention, so as to avoid obscuring the technical solutions contributed by the present invention to the prior art.

Example 1

The present invention is a plate-and-frame filter press, which is mainly composed of a frame, a compression plate (that is, a diaphragm plate or filter plate with a filter cavity on one side) and a thrust plate (that is, a The diaphragm plate or filter plate of the filter cavity), the intermediate plate frame assembled on the main beam between the compression plate and the thrust plate (that is, the diaphragm plate and filter plate with the filter cavity on both sides), arranged on each adjacent plate frame The filter cloth between them, as well as the feeding system, the drainage system, the hydraulic system, the compressed air system, etc.

Referring to Figure 1, Figure 2 and Figure 3, for the convenience of description, the plates and frames on the frame are hereinafter divided into diaphragm plates 1 and filter plates 2, that is, the plates and frames on the frame are alternately arranged in multiple phases. Diaphragm plate 1 and multiple filter plates 2.

The filter chamber of the diaphragm plate 1 has a flexible diaphragm 101 that forms a pressure chamber with the diaphragm plate substrate. Several protrusions 102 are formed on the extrusion working surface of the flexible diaphragm 101. These protrusions 102 are formed by a plurality of large-diameter protrusions and It is composed of several small-diameter protrusions, and drainage slots are formed between adjacent protrusions 102 . Specifically, the large-diameter protrusions are arranged on the non-edge area of the flexible diaphragm 101, and the small-diameter protrusions are arranged on the edge area of the flexible diaphragm 101 and the area between the large-diameter protrusions, regardless of whether the large-diameter protrusions or the small-diameter protrusions The protrusions have concave drainage slots between adjacent protrusions 102; the diameter of the large-diameter protrusions is usually about 2 to 3 times the diameter of the small-diameter protrusions (eg, 2 times or 3 times, etc.).

The upper two corners of the base plate of the diaphragm plate 1 are respectively provided with a hole section for forming the corresponding feed channel 7, and the bottom two corners of the base plate are respectively provided with a corresponding filtrate channel (namely, the filtrate channel 1 9 and the filtrate channel 2). 11) The hole section, the center of the lower part of the base plate is provided with a hole section for forming the extrusion channel 8. Correspondingly, the upper two corners of the base plate of the filter plate 2 are respectively provided with a hole section for forming the corresponding feed channel 7, and the bottom two corners of the base plate are respectively provided with a corresponding filtrate channel (that is, the filtrate channel one). 9 and filtrate channel 2 11), a hole section for forming the extrusion channel 8 is arranged at the center of the lower part of the base plate. After each diaphragm plate 1 and each filter plate 2 arranged alternately are closed in order, the corresponding hole sections at the upper two corners are axially butt-jointed together to form a corresponding feeding channel 7, and each feeding channel 7 is connected to the feeding system. The corresponding hole segments at the lower corner are axially butt-jointed together to form the corresponding filtrate channel one 9, and the corresponding hole segments at the other corner of the lower part are axially butted together to form the corresponding filtrate channel two 11, and the filtrate channel one 9 and the filtrate channel 2 11 are respectively connected with the drainage system; the corresponding hole segments at the center are axially butted together to form a squeeze channel 8, and the squeeze channel 8 is connected with the compressed air system (which may also be a high-pressure water system). In the aforementioned structure, each feed channel 7 passes through the corresponding distribution channel (the distribution channel can be formed on the diaphragm plate, can also be formed on the filter plate, or can be separately formed on the diaphragm plate and the filter plate) and each The filtration cavities are connected respectively; the filtrate channel-9 passes through the corresponding liquid-inducing channel-10 (the liquid-inducing channel-1 can be single-molded on the diaphragm plate, or can be single-molded on the filter plate, or separately formed on the diaphragm plate and the filter plate. ) is communicated with each filter cavity respectively; the filtrate channel two 11 passes through the corresponding liquid introduction channel two 12 (the liquid introduction channel two can be single-molded on the diaphragm plate, or can be single-molded on the filter plate, or on the diaphragm plate and the filter plate. The extrusion channel 8 communicates with each pressure cavity respectively through the corresponding drainage channel (the drainage channel is formed on the diaphragm plate).

The first filtrate channel 9 and the second filtrate channel 11 are distinguished because one of the filtrate channels needs to double as a gas drying channel. In this embodiment, the first filtrate channel 9 also serves as a gas drying channel, and the second filtrate channel 11 is always the filtrate channel. Therefore, the second filtrate channel 11 does not double as a gas drying channel, which is connected in the drainage system according to the conventional structure. The filtrate channel-9 doubles as a gas drying channel, which is not only connected in the drainage system according to the traditional structure, but also connected in the compressed air system through a switching valve; preferably, the compressed air system is connected upstream of the filtrate channel-9, And the switching valve is preferably a one-way valve, that is, the gas in the control compressed air system can only be input into the filtrate channel one 9, and the filtrate in the filtrate channel one 9 cannot be input into the compressed air system.

In the filter cavity of the filter plate 2, a filter screen 5 which is closely attached to the base plate of the filter plate 2 and can form a drainage channel in the filter cavity of the filter plate 2 is arranged.

In the arrangement structure of the above diaphragm plates 1 and filter plates 2, adjacent diaphragm plates 1 and filter plates 2 form a filter cavity that can hold slurry and press and filter the slurry. An independent filter cloth 3 is arranged in each filter chamber. The independence means that the filter cloth in the current filter chamber is not discontinuous with the filter cloths in the other filter chambers, that is, the filter cloth 3 in each filter chamber is independent existence. The filter cloth 3 arranged in each filter chamber is a double-layer structure, and the double-layer structure filter cloth 3 is composed of the two sides of the filter cloth hanging on the corresponding support rod 4 that wrap around and sag. 1. The flexible diaphragm 101 in the filter chamber, the other side of the drooping loop corresponds to the filter screen 5 in the filter chamber of the filter plate 2; The corresponding cloth channel corresponds to the space between the two layers of filter cloths 3 in the filter cavity.

The control method (that is, the use method) of the pressing and filtering work of the above-mentioned filter press is:

- The plates and frames on the rack are sequentially closed to form multiple filter cavities, and each channel is also formed by butt joint;

- Distribute the slurry in each filter chamber through the liquid inlet channel 7;

- After the feeding is completed, a fluid medium (such as compressed air or water, etc.) is introduced into each pressure chamber through the extrusion channel 8, so that the flexible diaphragm 101 is expanded to squeeze the slurry in the corresponding filter chamber;

- Most of the filtrate squeezed out in each filter cavity is discharged through the filtrate channel one 9 and the filtrate channel two 11 until about 2/3 of the entire pressing and filtering process is completed (that is, the remaining about 1/3 of the entire pressing and filtering process is completed. time course), still keep the pressure chamber of the diaphragm plate 1 to continue to squeeze and do work, at the same time, open the switching valve connected to the filtrate channel 1 9, turn on the compressed air (the filtrate channel 2 11 maintains its filtrate output function), so that the compressed air Enter the pressure chamber of the auxiliary diaphragm plate 1 in each corresponding filter chamber to perform extrusion work, and the compressed air performs wind extrusion drying on the filter cake 6 in the filter chamber;

- Until the pressing and filtering process is completed, stop the air supply to the filtrate channel 1 9 by switching the valve, and remove the pressure in the pressure chamber of the diaphragm plate 1; pull the plate to unload the slag.

The pressing and filtering method of the above-mentioned diaphragm plate extrusion and air force extrusion drying is compared with the traditional pressing and filtering method of pressing by diaphragm plate alone. The test results show that: when the filter residue basically maintains the same dryness state, the Compared with the traditional method, the pressing and filtration cycle is shortened by more than half, and the efficiency can be greatly improved.

The pressing and filtration method of the above-mentioned diaphragm plate extrusion and air-driven extrusion drying is also used for the pressing and filtration method (referred to as "pressing and then blowing method") in which compressed air is introduced after the diaphragm plate is extruded for air-driven extrusion drying. Compared with the "press first and then blow method", the pressing and filtering cycle of the present invention is shortened by more than 4 minutes, and the compressed air is saved by more than 40%, which still remains significant. of high efficiency and energy saving. The reason is that the "press first and then blow method" increases the space of the filter chamber after the pressure chamber is relieved, and part of the compressed air entering the filter chamber cannot form effective and sufficient contact with the filter cake and is directly discharged through the filtrate channel. Although a part of the compressed air acts on the filter cake, the compressed air acting on the filter cake causes the filter cake to spread out and deform in the relatively empty filter cavity, resulting in a large number of air leakage cracks. The compressed air acting on the filter cake is large. Part of it flows through these cracks and is discharged into the filtrate channel. In this way, the entire pressing and filtration process requires a lot of compressed air, the cycle is long, and the drying treatment of the filter cake is relatively limited.

Example 2

The present invention is a plate-and-frame filter press, which is mainly composed of a frame, a compression plate (that is, a diaphragm plate or filter plate with a filter cavity on one side) and a thrust plate (that is, a The diaphragm plate or filter plate of the filter cavity), the intermediate plate frame assembled on the main beam between the compression plate and the thrust plate (that is, the diaphragm plate and filter plate with the filter cavity on both sides), arranged on each adjacent plate frame The filter cloth between them, as well as the feeding system, the drainage system, the hydraulic system, the compressed air system, etc.

For the convenience of description, the plates and frames on the rack are hereinafter divided into diaphragm plates and filter plates, that is, the plates and frames on the rack are multiple diaphragm plates and multiple filter plates arranged alternately.

The filter chamber of the diaphragm plate has a flexible diaphragm that forms a pressure chamber with the diaphragm plate substrate. Several protrusions are formed on the extrusion working surface of the flexible diaphragm. These protrusions are formed by a plurality of large-diameter protrusions and a number of small-diameter protrusions. A drainage slot is formed between adjacent protrusions. Specifically, the large-diameter protrusions are arranged on the non-edge area of the flexible diaphragm, and the small-diameter protrusions are arranged on the edge area of the flexible diaphragm and the area between the large-diameter protrusions, regardless of whether the large-diameter protrusions or the small-diameter protrusions , there are concave drainage slots between adjacent protrusions; the diameter of large-diameter protrusions is usually about 2 to 3 times the diameter of small-diameter protrusions (for example, 2 times or 3 times, etc.).

The upper two corners of the base plate of the diaphragm plate are respectively provided with a hole section for forming the corresponding feeding channel, the bottom two corners of the base plate are respectively provided with a hole section for forming the corresponding filtrate channel, and one side of the center of the bottom part of the base plate is provided with a hole section. A hole section used to form an extrusion channel, and a hole section used to form a gas drying channel is provided on the other side of the center of the lower part of the base plate. Correspondingly, the upper two corners of the base plate of the filter plate are respectively provided with a hole section for forming the corresponding feeding channel, the bottom two corners of the base plate are respectively provided with a hole section for forming the corresponding filtrate channel, and the center of the lower part of the base plate is respectively provided with a hole section for forming a corresponding filtrate channel. One side of the base plate is provided with a hole section for forming an extrusion channel, and the other side at the center of the lower part of the base plate is provided with a hole section for forming a gas drying channel. After the alternately arranged diaphragm plates and filter plates are closed in order, the corresponding hole sections at the upper two corners are axially butt-jointed together to form a corresponding feeding channel, and each feeding channel is connected with the feeding system; Corresponding hole segments at the two corners are axially butt-jointed together to form corresponding filtrate channels, and each filtrate channel is connected to the drainage system; the corresponding hole segments on one side of the lower center are axially butt-jointed together to form corresponding extrusion channels , the extrusion channel is connected with the compressed air system (it can also be a high-pressure water system); the corresponding hole segments on the other side of the lower center are axially butted together to form the corresponding gas drying channel, which is connected to the compressed air system. link. In the aforementioned structure, each feed channel passes through the corresponding cloth channel (the cloth channel can be formed on the diaphragm plate, can also be formed on the filter plate, or can be separately formed on the diaphragm plate and the filter plate) and each filter. The cavities are respectively connected; each filtrate channel passes through the corresponding liquid introduction channel (the liquid introduction channel can be formed on the diaphragm plate, can also be formed on the filter plate, or can be separately formed on the diaphragm plate and the filter plate) and each filter. The cavities are respectively communicated; the extrusion channel is communicated with each pressure cavity through the corresponding drainage channel (the drainage channel is formed on the diaphragm plate); It can also be formed on the filter plate alone, or separately formed on the diaphragm plate and the filter plate) and communicated with each filter cavity respectively.

In the filter cavity of the above-mentioned filter plate, a filter screen which is closely attached to the filter plate substrate and can form a drainage channel in the filter cavity of the filter plate is arranged.

In the arrangement structure of the above diaphragm plates and filter plates, adjacent diaphragm plates and filter plates form a filter cavity that can hold slurry and press and filter the slurry. An independent filter cloth is arranged in each filter chamber, which means that the filter cloth in the current filter chamber is not discontinuous with the filter cloths in the other filter chambers, that is, the filter cloth in each filter chamber is independent exist. The filter cloth arranged in each filter chamber is a double-layer structure. The double-layer structure filter cloth is composed of the two sides of the filter cloth hanging on the corresponding struts, and the side of the loop and sagging corresponds to the diaphragm plate filter chamber. The other side of the looped and sagging side corresponds to the filter screen in the filter chamber of the filter plate; the two layers of filter cloth are used for distributing slurry, that is, the corresponding cloth holes on the above-mentioned feed channel correspond to the filter screen in the filter chamber. The space between the two layers of filter cloth.

The control method (that is, the use method) of the pressing and filtering work of the above-mentioned filter press is:

- The plates and frames on the rack are sequentially closed to form multiple filter cavities, and each channel is also formed by butt joint;

- Distribute the slurry in each filter chamber through the liquid inlet channel;

- After the feeding is completed, the fluid medium (such as compressed air or water, etc.) is introduced into each pressure chamber through the extrusion channel, so that the flexible diaphragm is expanded to squeeze the slurry in the corresponding filter chamber;

-Most of the filtrate squeezed out in each filter chamber is discharged through the filtrate channel until about 2/3 of the entire pressing and filtration process is completed (that is, the remaining about 1/3 of the entire pressing and filtering process), the diaphragm is still maintained The pressure chamber of the plate continues to squeeze to do work, and at the same time, open the gas drying channel and conduct the compressed air into the pressure chamber of the auxiliary diaphragm plate in each corresponding filter chamber to perform the squeeze work, and the compressed air performs wind extrusion on the filter cake in the filter chamber. drying treatment;

-Until the pressing and filtering process is completed, stop the air supply to the gas drying channel, remove the pressure in the pressure chamber of the diaphragm plate; pull the plate to unload the slag.

Example 3

The other contents of this embodiment are the same as those of Embodiment 1 or 2, the difference is that: until about 1/2 of the entire pressing and filtering process is completed (that is, about 1/2 of the time remaining in the entire pressing and filtering process), the The drying channel passes compressed air into each filter cavity.

Example 4

The other contents of this embodiment are the same as those of Embodiment 1 or 2, the difference is that: until about 3/4 of the entire pressing and filtering process is completed (that is, the remaining about 1/4 of the entire pressing and filtering process), the gas The drying channel passes compressed air into each filter cavity.

The above embodiments are only used to illustrate the present invention, but not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the specific technical solutions in the above embodiments can still be modified, or some technical features thereof can be equivalently replaced, such as All the protrusions on the flexible diaphragm of the diaphragm plate are of equal diameter structure, for example, the two layers of filter cloth in the same filter chamber are composed of two filter cloths that are independent of each other and arranged side by side; and these modifications or replacements do not make the corresponding technology The essence of the scheme departs from the spirit and scope of the present invention.

Claims (10)

1. A high-efficiency and energy-saving filter press, comprising a plurality of diaphragm plates (1) and a plurality of filter plates (2) alternately arranged on a frame, and between adjacent diaphragm plates (1) and filter plates (2); Each filter chamber is provided with a filter cloth (3), and at least one feed channel (7), at least one filtrate channel and at least one extrusion channel ( 8), the feed channel (7) is communicated with each filter cavity through the corresponding distribution hole, the filtrate channel is communicated with each filter cavity through the corresponding liquid introduction hole, and the extrusion channel (8) is communicated with the corresponding filter cavity. The drainage channels of the filter are communicated with each pressure chamber respectively; it is characterized in that, these plates and frames are also provided with at least one gas drying channel that can pass compressed air into each filter chamber during the pressing and filtering process, and the gas drying channel passes through the corresponding The air-inducing channels are communicated with each filter cavity respectively. 2 . The high-efficiency and energy-saving filter press according to claim 1 , wherein the filtrate channels are at least two independent of each other, and one of the filtrate channels doubles as a gas drying channel. 3 . 3. The high-efficiency and energy-saving filter press according to claim 1, wherein a plurality of protrusions (102) are formed on the extrusion working surface of the flexible diaphragm (101) of the diaphragm plate (1), and adjacent protrusions are formed. A drainage slot is formed between (102); a filter screen (5) capable of forming a drainage channel is arranged in the filter cavity of the filter plate (2). The high-efficiency and energy-saving filter press according to claim 3, characterized in that, the protrusions (102) on the extrusion working surface of the flexible diaphragm (101) are composed of a plurality of large-diameter protrusions and a plurality of small-diameter protrusions composition, the large-diameter protrusions are arranged in the non-edge area of the flexible diaphragm (101), the small-diameter protrusions are arranged in the edge area of the flexible diaphragm (101), and the area between the major diameter protrusions . 5. The high-efficiency and energy-saving filter press according to claim 1 or 3, characterized in that the filter cloth (3) provided in the filter cavity formed by the diaphragm plate (1) and the filter plate (2) is a double-layered filter cloth (3). Layer structure, the two layers of filter cloth (3) are used for arranging the slurry, one side of the filter cloth corresponds to the diaphragm plate (1), and the other side of the filter cloth corresponds to the filter plate (2). 6 . The high-efficiency and energy-saving filter press according to claim 5 , wherein the filter cloth ( 3 ) in the filter chamber and the filter cloths in the other filter chambers are discontinuous and independent structures. 7 . 7. The high-efficiency and energy-saving filter press according to claim 5, characterized in that, the double-layer structure filter cloth (3) in the filter chamber is composed of two sides hanging on the support rod (4) and sagging. . 8. A pressing and filtering method based on the high-efficiency and energy-saving filter press of claim 1, wherein the technical measures taken by the pressing and filtering method are: In the second half of the process of pressing and filtering the slurry in the filter chamber, keep the pressure chamber of the diaphragm plate to continue to squeeze and do work, and pass the compressed air into the gas drying channel, so that the compressed air can extrude the filter cake in the filter chamber by wind force. Dry treatment. 9. A pressing and filtering method based on the described high-efficiency and energy-saving filter press of claim 8, wherein the technical measures taken by the pressing and filtering method are: - there are at least two mutually independent filtrate channels on the filter press; -In the second half of the process of pressing and filtering the slurry in the filter chamber, keep the pressure chamber of the diaphragm plate to continue to squeeze and do work, and pass compressed air into one of the filtrate channels, so that the compressed air can wind the filter cake in the filter chamber. Extrusion drying; - The remaining filtrate channels maintain the filtrate output function. 10. A method for pressing and filtering based on the high-efficiency and energy-saving filter press according to claim 8 or 9, wherein the introduction of the compressed air is in the remaining 1/2-1/4 time course of the pressing and filtering process place.

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