CN213348045U

CN213348045U - Filter cake drying device of pressure filter

Info

Publication number: CN213348045U
Application number: CN202022129256.6U
Authority: CN
Inventors: 孙超
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-06-04
Anticipated expiration: 2030-09-25

Abstract

The utility model discloses a filter cake drying device of pressure filter, install including a jar body and rotation the internal filter plate of jar, the internal filter cell body that is provided with of jar, the filter plate warp filter the cell body and collect solid particle and form the filter cake, install on the jar body and be used for improving the filter cake drying device of filter cake dehydration rate, filter cake drying device includes air heating pressure device and hot-air distribution cover, hot-air distribution cover is established the filter plate outside, air heating pressure device through first connecting pipe with hot-air distribution cover switches on, air heating pressure device discharges through hot-air distribution cover after air heating, pressurization. The utility model relates to a filter cake drying device of pressure filter effectively takes away filter cake moisture, improves pressure filter's dehydration effect, practices thrift the cost input.

Description

Filter cake drying device of pressure filter

Technical Field

The utility model relates to a coal dressing dehydration technical field, in particular to pressure filter cake drying device.

Background

The pressure filter is a fine coal slime dewatering device commonly used in coal preparation plants, and aims to realize separation of coal and water to the maximum extent, improve coal quality and recycle recovered water. The structure and the working principle of the pressure filter are as follows: the filter is placed in a closed pressurizing bin, when slime water is fed into a filter tank body by a feeding pump, compressed air with certain pressure is filled in the pressurizing bin, a pressure difference is formed between a control head and a steam-water separator communicated with the atmosphere on a green disc, liquid in the tank body is discharged through a filtering medium immersed in suspension liquid under the action of the pressure in the pressurizing bin, and solid particles are collected on the filtering medium (filter cloth) to form a filter cake. With the rotation of the filter disc, the filter cake is discharged into a conveyer in a discharging area after further drying and dewatering, and three continuous processes of filtering, drying and falling are completed.

The filter disc is generally composed of a plurality of filter fans, the filter fans are fixed on the main shaft by bolts, pressing strips and pressing plates, and each filter fan is an independent filter unit. The filter plate is a hollow structure made of light metal or plastic, and a circular tube in the inner cavity of the filter plate is communicated with a filtrate hole of the main shaft. The outside of the filter plate is wrapped with filter cloth. The control head is fixed at two ends of the main shaft and divides the filtering process into three areas of filtering, drying and blowing. In different areas, the filtering fan is respectively connected with the atmosphere and the back blowing. After the large tank is filled with a certain pressure, when the filter disc rotates clockwise, the filter disc passes through the filtering area, the drying area and the filter cake falling area in sequence, so that each filter fan is connected with different areas. When the filter fan is positioned in the filter area, the filter fan is communicated with the atmosphere, coal slurry moves to the filter cloth under the pressure of the large tank, and coal particles form a filter cake on the filter cloth; the filtrate enters the inner cavity of the filter fan through the filter cloth and is discharged through the filtrate hole of the main shaft, so that the filtration is realized. When the filter fan is in the drying zone, it is still connected to the atmosphere, but at this point the filter fan is already out of the level of the coal slurry. At this time, the high-pressure air in the large tank is discharged to the atmosphere through the gaps among the filter cake coal particles, and takes away the moisture among the gaps of the coal particles, so that the moisture of the filter cake is further reduced. When the filter fan enters a filter cake blowing-off area, the filter fan is connected with back blowing, the pressure of the back blowing is generally higher than the pressure of a large tank by 0.05Mpa, and the filter cake is blown off. This completes a filtration cycle. With the rotation of the main shaft, the filter fan enters the coal slurry again, and the next filtering cycle is started.

According to the structure and the working principle of pressure filtration, the separation of coal and water is realized in two areas, namely a filtration area which is mainly influenced by the pressure of a large tank, the higher the pressure is, the better the filtration effect is, but in the actual production process, the pressure of the large tank cannot be infinite, generally in the range of 0.3-0.5 Mpa; and the second is a drying area which is mainly influenced by the temperature, pressure, humidity and quality of the passing air, and the higher the temperature of the passing air is, the larger the pressure is, the larger the quality is, the smaller the humidity is, the more the moisture is taken away, and the better the effect is. Factors that affect the temperature, pressure, mass, humidity of the passing air are many, such as: local air humidity, air temperature, filter cloth properties, coal slime grain size composition, and the like.

In the prior art, a plurality of methods for improving the dehydration effect of a pressure filter exist, and the method mainly comprises the following aspects:

(1) differential pressure method of expansion

Expanding the pressure differential can affect not only the dewatering effect during the filtration stage, but also the dewatering effect during the drying stage. Essentially, the methods used at present to increase the dewatering effect of pressure filters are more or less related to such methods. The most direct method is to increase the pressure of the large tank as much as possible, but the cost of the compressed air, and safety factors, increase the pressure only within a certain range.

(2) Improving the air permeability of coal slime

The aim of the method is to filter out as much water as possible through the filter cloth in the filtration phase and to let as much air as possible through the drying phase, for example: the filter cloth with better air permeability is adopted, so that water and air can be smoothly discharged; the granularity composition of the coal slime is improved by adding filtering agent, coarse mixing and other processes, so that gaps among the coal slime are reasonably distributed, and water and air can smoothly pass through the gaps; adjusting the working parameters and feeding properties of the pressure filter, and the like. Although the method can effectively improve the dehydration rate of the filter cake, the process is complex, the production cost is increased, and the equipment cost investment is increased.

The above techniques all have certain drawbacks in the use of the pressure filter, and therefore it is necessary to provide a device for improving the dewatering effect of the pressure filter by controlling the temperature of the air passing through the cake.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a pressure filter cake drying device through improving filter cake air temperature, air saturation vapour pressure, when high temperature drying air passes through the filter cloth, increases the steam volume of taking away, and then realizes improving pressure filter's dehydration effect.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: the utility model provides a pressure filter cake drying device, installs including a jar body and rotation the internal filter plate of jar, the internal filter cell body that is provided with of jar, the filter plate warp filter the cell body and collect solid particle and form the filter cake, install on the jar body and be used for improving the filter cake drying device of filter cake dehydration rate, filter cake drying device includes air heating pressure device and hot-air distribution cover, hot-air distribution cover establishes the filter plate outside, air heating pressure device through first connecting pipe with hot-air distribution cover switches on, air heating pressure device distributes the cover with air heating, pressurization back through hot-air and discharges.

As a further improvement of the utility model, the hot air distribution cover and the filter plate are not contacted with each other; the hot air distribution cover is provided with two side plates, a drying cavity is formed between the two side plates, and the filter plate is positioned in the drying cavity.

As a further improvement, the utility model discloses a two all be provided with the hot-blast cavity that is used for the circulation of air in the curb plate, two the hot-blast cavity is close to a plurality of gas pockets have all been seted up to a filter plate lateral wall.

As a further improvement of the utility model, the inner wall of the hot air chamber is coated with a first heat insulation layer.

As a further improvement of the utility model, the air heating and pressurizing device comprises an air heating device and an air compressing device which are connected with each other.

As a further improvement of the present invention, the air compressing device is connected to the air heating device through a second connecting pipe, and the air heating device is connected to the hot air distribution cover through the first connecting pipe; and the air compression device is communicated with the inner cavity of the tank body through a third connecting pipe.

As a further improvement of the present invention, the first connecting pipe, the second connecting pipe and the third connecting pipe are respectively provided with a regulating valve for controlling the air flow rate.

As a further improvement of the utility model, the first connecting pipe is externally provided with a heat insulation device.

As a further improvement of the present invention, the heat insulation device is a second heat insulation layer coated outside the first connection pipe.

The utility model has the advantages that: the utility model provides a filter cake drying device of a pressure filter, which is provided with an air heating device, an air compression device and a hot air distribution cover, wherein the hot air distribution cover is sleeved outside a filter plate, the air compression device and the air heating device respectively pressurize and heat the air to form hot air, the hot air is blown to the filter cake through air holes on the hot air distribution cover, the amount of water vapor taken away is increased, the dehydration effect of the pressure filter is further improved, the blank of the prior art for improving the dehydration effect of the pressure filter is made up, and meanwhile, the cost investment is saved; set up hot-air distribution cover for with strain the fan-shaped shape that the fan matches, form the drying chamber between its both sides board, strain on the fan cake and dewater through the drying chamber in proper order, can play the effect to hot-air evenly distributed, prevent that air temperature reduction rate is too fast, the hot-air of being convenient for passes through the filter cake rapidly, takes away filter cake moisture.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a perspective view of the hot air distribution cover of the present invention;

fig. 3 is a schematic structural view of the hot air distribution cover and the filter plate of the present invention;

wherein the direction indicated by the arrow in fig. 3 is the direction of the air flow.

The following description is made with reference to the accompanying drawings:

1-tank body; 2-filter plate;

3-air heating and pressurizing device; 301-air heating means;

302-air compression device; 4-hot air distribution hood;

401-side panel; 4011-stomata;

402-drying chamber; 5-first connecting pipe;

6-second connecting pipe; 7-third connecting pipe.

Detailed Description

The following description of the preferred embodiments of the present invention will be made in conjunction with the accompanying drawings.

Referring to fig. 1 to 3, the utility model provides a filter cake drying device of a pressure filter, including jar body 1 and rotation install the filter plate 2 in jar body 1, be provided with the filtration cell body that is located the bottom in jar body 1, filter plate 2 forms the filter cake through filtering the cell body with solid particle collection. Install the filter cake drying device who is used for improving filter cake dehydration rate on jar body 1, filter cake drying device includes air heating pressure device 3 and hot-air distribution cover 4, hot-air distribution cover 4 cover is established in the 2 outsides of filter plate, air heating pressure device 3 switches on through first connecting pipe 5 and hot-air distribution cover 4, air heating pressure device 3 with the air heating, discharge through hot-air distribution cover 4 after the pressurization, filter cake on the filter plate 2 is dried, increase the steam volume of taking away, improve its dehydration effect.

Referring to fig. 2 and 3, the filter plate 2 is composed of a plurality of filter sectors, the filter sectors are fixed on a main shaft by bolts, pressing bars and pressing plates to form a circular filter plate 2, and a plurality of filter plates 2 are arranged on the main shaft at equal intervals. Every filter plate 2 all overlaps to be equipped with hot-air distribution cover 4 outward, and hot-air distribution cover 4 and filter plate 2 non-contact each other, and hot-air distribution cover 4 is the fan-shaped shape that matches with the filter fan. The hot air distribution cover 4 is provided with two side plates 401, a drying cavity 402 is formed between the two side plates 401, the filter plate 2 is positioned in the drying cavity 402, and when the filter plate 2 rotates, the filter cake on the filter fan is driven to sequentially pass through the drying cavity 402. All be provided with the hot-blast cavity that is used for circulation of air in two curb plates 401, a plurality of gas pockets 4011 have all been seted up near 2 lateral walls of filter plate to two hot-blast cavities, in the hot-blast cavity of heating, pressurized air inflow hot-air distribution cover 4 through first connecting pipe 5 to blow to the filter cake by gas pocket 4011, the hot-blast moisture that takes away on it behind the filter cake of both sides, outwards discharges through the exhaust passage in the filter plate 2. The hot air distribution cover 4 can play a role in uniformly distributing hot air, so that the air temperature is prevented from being reduced too fast, and hot air is convenient to rapidly pass through a filter cake to take away water in the filter cake.

The inner walls of the hot air chambers are coated with the first heat insulation layers, so that heat dissipation outside the hot air distribution cover 4 is prevented, heat loss can be effectively reduced, and the air of the hot air distribution cover 4 is ensured to be in a certain temperature range.

Referring to fig. 1, the air heating and pressurizing device 3 includes an air heating device 301 and an air compressing device 302 connected to each other. The air heating device 301 mainly functions to supply air to the pressure filter for heating, and heats air by heat conduction, heat convection, heat radiation, and the like, for example: electromagnetic heating, infrared heating, resistance heating and the like, and the specific heating mode is not limited, and air heating can be realized. The air compressor 302 is an air compressor, but is not limited thereto, and may be configured to supply air satisfying the operating conditions to the pressure filter. In the actual use process, the heat energy converted from the mechanical energy can be directly used for supplying hot air to the pressure filter in the working process of the air compression device 302, so that the energy is saved. The air compressor device 302 is connected to the air heater device 301 via the second connecting pipe 6, and the air heater device 301 is connected to the hot air distribution cover 4 via the first connecting pipe 5. The air compressing device 302 compresses air to make the air reach a certain pressure value, the pressurized air flows into the air heating device 301 through the second connecting pipe 6 to be heated, and the heated air flows into the hot air distribution cover 4 through the first connecting pipe 5. The air compressor 302 is communicated with the inner cavity of the tank body 1 through a third connecting pipe 7, the third connecting pipe 7 is a branch pipe connected from the second connecting pipe 6, one part of the air pressurized by the air compressor 302 enters the air heater 301, and the other part of the air directly enters the tank body 1 through the third connecting pipe 7. It should be noted that, in the present embodiment, the sequence of pressurizing and heating air can be adjusted, that is, the air can be heated by the air heating device 301, and the heated air can be pressurized by the air compression device 302, only the pressure condition needs to be controlled.

Wherein, install heat-proof device outside first connecting pipe 5, heat-proof device is the cladding second insulating layer outside first connecting pipe, effectively reduces heat loss in the hot-blast transportation process. The first connection pipe 5, the second connection pipe 6, and the third connection pipe 7 are respectively provided with an adjustment valve for controlling the flow rate of air. The amount of air heated by the air heating device 301 and the amount of air not heated by the air heating device 301 need to be adjustable. In order to ensure that other equipment in the tank body 1 cannot work well due to excessive temperature influence, the air volume heated by the air heating device 301 is always kept smaller than the air volume which needs to penetrate through the filter cake in the filtration stage, namely the air volume which is not heated by the air heating device 301, and the air volume of the part existing for keeping the pressure of the tank body 1 stable needs to be properly large.

Firstly, compressing air by an air compression device 302, wherein one part of the pressurized air directly enters the tank body 1 through a third connecting pipe 7, and the other part of the pressurized air flows into an air heating device 301 through a second connecting pipe 6; secondly, heating air, wherein the temperature of the air heating is determined according to the water requirement of the filter cake and the temperature at the outlet of the branch connecting pipe; finally, in the normal working process of the pressure filter, the pressurized and heated air takes away moisture through the filter cake through the first connecting pipe 5 and the hot air distribution cover 4, and is collected in the steam-water separator through the upper filtrate pipeline and communicated with the atmosphere. The blank of the existing pressure filter for improving the dehydration effect is made up, the temperature of air penetrating through a filter cake can be improved, the speed of taking away moisture by the air is improved, and the dehydration effect of the pressure filter is further improved.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a pressure filter cake drying device, includes jar body (1) and rotates to install filter plate (2) in jar body (1), be provided with in jar body (1) and filter the cell body, filter plate (2) warp filter the cell body and collect solid particle and form filter cake, its characterized in that: install on jar body (1) and be used for improving the filter cake drying device of filter cake dehydration rate, filter cake drying device includes air heating pressure device (3) and hot-air distribution cover (4), hot-air distribution cover (4) cover is established the filter plate (2) outside, air heating pressure device (3) through first connecting pipe (5) with hot-air distribution cover (4) switch on, air heating pressure device (3) with air heating, behind the pressurization through hot-air distribution cover (4) discharge.

2. The filter cake drying device of a pressure filter according to claim 1, wherein: the hot air distribution cover (4) is not contacted with the filter plate (2); the hot air distribution cover (4) is provided with two side plates (401), a drying cavity (402) is formed between the two side plates (401), and the filter plate (2) is located in the drying cavity (402).

3. The filter cake drying device of a pressure filter according to claim 2, wherein: two all be provided with the hot-blast cavity that is used for circulation of air in curb plate (401), two hot-blast cavity is close to a plurality of gas pockets (4011) have all been seted up to a filter plate (2) lateral wall.

4. The filter cake drying device of a pressure filter according to claim 3, wherein: the inner walls of the hot air chambers are coated with first heat insulation layers.

5. The filter cake drying device of a pressure filter according to claim 1, wherein: the air heating and pressurizing device (3) comprises an air heating device (301) and an air compression device (302) which are connected with each other.

6. The filter cake drying device of a pressure filter according to claim 5, wherein: the air compression device (302) is connected with the air heating device (301) through a second connecting pipe (6), and the air heating device (301) is connected with the hot air distribution cover (4) through the first connecting pipe (5); the air compression device (302) is communicated with the inner cavity of the tank body (1) through a third connecting pipe (7).

7. The filter cake drying device of a pressure filter according to claim 6, wherein: and regulating valves for controlling the air flow are respectively arranged on the first connecting pipe (5), the second connecting pipe (6) and the third connecting pipe (7).

8. The filter cake drying device of a pressure filter according to claim 1, wherein: and a heat insulation device is arranged outside the first connecting pipe (5).

9. The filter cake drying device of a pressure filter according to claim 8, wherein: the heat insulation device is a second heat insulation layer coated outside the first connecting pipe.