Angle blowing and emptying device of filter press

Abstract

The utility model discloses an angle blowing emptying device of a filter press, and relates to the technical field of filter presses, one end of an undercurrent pipe is connected with the filter press, the other end of the undercurrent pipe is connected with a gas-water mixture separation structure, an emptying valve is arranged on the undercurrent pipe, an undercurrent branch pipe is arranged between the undercurrent pipe and a filtrate header pipe, and an undercurrent valve is arranged on the undercurrent branch pipe. According to the utility model, the condition of emptying with water is solved, the sanitation and air quality of a filter pressing workshop are improved, and the problem of waste of clean coal slime is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of filter presses, in particular to a corner blowing and emptying device for a filter press. Background Art

[0002] The corner blowing pressure of the new filter press is between 0.5 - 0.9 MPa, and the corner blowing time is as long as 330 s (if the time is too short, the requirement of reducing water cannot be met, but the production efficiency is reduced). The original underflow pipeline is directly connected to the filtrate main pipe. Limited by the original filtrate main pipe, the high-pressure air and the water in the filter cake are not discharged smoothly, and it emerges into the air from the feeding pipes of the filtrate tanks of the other two fine coal filter presses. If the other two fine coal filter presses are feeding, the situation is more serious, which will block the normal discharge of the filtrate, and the filtrate will overflow from the filtrate tank to the ground and the chute of the fine coal filter press. The discharged pressurized air and the fine coal particles entrained in the filtrate not only pollute the workshop environment, increase the labor input for sanitation cleaning, but also the fine coal particulate matter (mixture) discharged into the air is easy to enter the respiratory tract, bringing health harm to employees, and also causing waste of resources. Content of the Utility Model

[0003] The purpose of the utility model is to provide a corner blowing and emptying device for a filter press, which solves the problem of discharging water, improves the sanitation and air quality of the filter press workshop, and reduces the harm to employees' health caused by fine particulate matter; it solves the problem of waste of fine coal slime carried by the corner blowing liquid and realizes the collection and recycling of coal slurry water.

[0004] To achieve the above purpose, the utility model provides the following scheme:

[0005] The utility model provides a corner blowing and emptying device for a filter press, including: an underflow pipe, a filtrate main pipe and a gas-water mixture separation structure. One end of each underflow pipe is connected to the filter press, and the other end of each underflow pipe is connected to the gas-water mixture separation structure. An emptying valve is arranged on each underflow pipe, an underflow branch pipe is arranged between each underflow pipe and the filtrate main pipe, and an underflow valve is arranged on the underflow branch pipe.

[0006] Preferably, the gas-water mixture separation structure is a cyclone.

[0007] Preferably, the feeding track of the feeding pipe of the gas-water mixture separation structure is arranged in an involute shape.

[0008] Preferably, the air outlet of the gas-water mixture separation structure is located at the center of the top of the gas-water mixture separation structure.

[0009] Preferably, the discharge port at the bottom of the gas-water mixture separation structure is connected to the flotation feeding bucket of the flotation machine.

[0010] Preferably, one end of the underflow branch pipe is connected to the underflow pipe, the other end of the underflow branch pipe is connected to the filtrate main pipe, and the drain valve is arranged between one end of the underflow branch pipe and the feed pipe of the gas-water mixture separation structure.

[0011] Preferably, the inner diameter of the underflow pipe and the inner diameter of the underflow branch pipe are both smaller than the inner diameter of the filtrate main pipe.

[0012] Preferably, both the underflow valve and the drain valve are pneumatic valves.

[0013] The following technical effects are achieved by the present utility model compared with the prior art:

[0014] When the filter press angle blowing and draining device of the present utility model is filtering, the underflow valve is opened and the drain valve is closed, and the filtrate water enters the filtrate main pipe through the underflow pipe and the underflow branch pipe; when angle blowing, the underflow valve is closed and the drain valve is opened, and the pressurized gas-water mixture enters the gas-water mixture separation structure through the feed pipe arranged in an involute shape, which will not affect the normal operation of the filtrate main pipe. The air and the coal slime water are separated through the gas-water mixture separation structure to realize the collection of the coal slime water, and the coal slime water is recycled to the feeding tank of the flotation machine. The filter press angle blowing and draining device of the present utility model solves the problem of water-carrying during draining, improves the hygiene and air quality of the filter press workshop, and reduces the harm to the health of employees caused by fine particulate matter; it solves the problem of waste of fine coal slime carried by the liquid during angle blowing and realizes the collection and recycling of the coal slime water. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic diagram of the filter press angle blowing and draining device of the present utility model;

[0017] In the figure: 1 - underflow pipe, 2 - filtrate main pipe, 3 - gas-water mixture separation structure, 4 - drain valve, 5 - underflow branch pipe, 6 - underflow valve, 7 - thickener, 8 - air outlet, 9 - discharge port. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] The purpose of the present invention is to provide a corner blowing and emptying device for a filter press, which solves the problem of water-carrying during emptying, improves the hygiene and air quality in the filter press workshop, and reduces the harm to employees' health caused by fine particulate matter; it solves the problem of waste of fine coal slime carried by the corner blowing liquid and realizes the collection and recycling of coal slime water.

[0020] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] As Figure 1 shown, this embodiment provides a corner blowing and emptying device for a filter press, including: an underflow pipe 1, a filtrate main pipe 2, and a gas-water mixture separation structure 3. One end of the underflow pipe 1 of each filter press is connected to the filter press, and the other end of the underflow pipe 1 of each filter press is connected to the gas-water mixture separation structure 3. An emptying valve 4 is provided on the underflow pipe 1, and an underflow branch pipe 5 is provided between the underflow pipe 1 and the filtrate main pipe 2. An underflow valve 6 is provided on the underflow branch pipe 5, and the filtrate main pipe 2 is connected to a thickener 7.

[0022] Specifically, in this embodiment, the gas-water mixture separation structure 3 is a hydrocyclone. The feeding trajectory of the feeding pipe of the gas-water mixture separation structure 3 is arranged in an involute shape. The gas outlet 8 of the gas-water mixture separation structure 3 is located at the center of the top of the gas-water mixture separation structure 3, and the discharge port 9 at the bottom of the gas-water mixture separation structure 3 is connected to the flotation feed tank of the flotation machine.

[0023] In this embodiment, one end of the underflow branch pipe 5 is connected to the underflow pipe 1, and the other end of the underflow branch pipe 5 is connected to the filtrate main pipe 2. The emptying valve 4 is provided between one end of the underflow branch pipe 5 and the feeding pipe of the gas-water mixture separation structure 3.

[0024] In this embodiment, the inner diameters of the underflow pipe 1 and the underflow branch pipe 5 are both smaller than the inner diameter of the filtrate main pipe 2. The inner diameters of the underflow pipe 1 and the underflow branch pipe 5 are both 125 mm, and the inner diameter of the filtrate main pipe 2 is 250 mm.

[0025] In this embodiment, both the underflow valve 6 and the emptying valve 4 are pneumatic valves, and the opening and closing of both the underflow valve 6 and the emptying valve 4 are controlled by a PLC controller.

[0026] The corner blowing and emptying device of the filter press in this embodiment separates gas and water by using a waste hydrocyclone through the arrangement of an underflow branch pipe 5, an underflow valve 6 and an emptying valve 4. Under the action of pressure, the gas-water mixture rotates at a high speed in the hydrocyclone by itself. Due to the high-speed rotation, a centrifugal force is generated. The centrifugal force is directly proportional to the specific gravity. Therefore, the centrifugal force received by the coal slime water is much greater than that received by the air, resulting in the coal slime water clinging to the inner wall of the hydrocyclone and flowing downward from the discharge port 9 at the bottom of the hydrocyclone under the action of gravity. The air accumulates in the center of the hydrocyclone to form an air column and is discharged into the atmosphere upward from the central pipe of the hydrocyclone through the air outlet 8 under the action of pressure.

[0027] Collection and recycling of coal slime water: The coal slime water flowing out of the hydrocyclone is collected and sent to the flotation machine again to recover clean coal, with considerable benefits. According to multiple tests, it is known that during corner blowing, the amount of water blown out each time during corner blowing is about 0.7 m 3 , and the coal slime content in the blown-out water is about 6 Kg / m 3 , with an ash content of 23%. 75% can be recovered by re-flotation. The amount that can be recovered per cycle is: 0.7×6×75% = 3.15 Kg. Calculated according to 20 cycles per shift for each unit, 2 shifts per day, and 330 days of production per year, about 3.15×20×2×330 = 41580 Kg = 41.58 tons of dry clean coal can be recovered more annually. Calculated according to 8% moisture content of the product clean coal, about 41.58 / 0.92 = 45.2 tons of product clean coal can be recovered. Calculated at 1500 yuan / ton for the product clean coal, the annual income can be about 45.2×1500 yuan = 67,800 yuan.

[0028] After the transformation, the situation of water-carrying during emptying is solved, the hygiene and air quality in the filter press workshop are improved, and the harm to employees' health caused by fine particles is reduced; the gas and coal slime water are separated through the gas-water mixture separation structure, reducing the back pressure generated by the gas-liquid mixture in the pipeline of the existing technology, and at the same time reducing the resistance caused by the discharge of high-pressure air carrying filtrate in the existing technology; due to the reduction of back pressure, the corner blowing time is reduced from 330 s to 180 s, and the corner blowing time is reduced to 150 s, and the average moisture content of the floating concentrate can still be maintained at 17%. Due to the reduction of the corner blowing time, the equipment usage efficiency is greatly improved; by setting the underflow valve 6, the emptying valve 4 and the gas-water mixture separation structure 3, the high-pressure air and the moisture in the filter cake are emptied smoothly. During corner blowing, no special person needs to monitor the filtrate tanks of the other two clean coal filter presses, saving labor input; the problem of waste of fine coal slime carried by the corner blowing liquid is solved, and the collection and recycling of coal slime water are realized.

[0029] This embodiment provides a working method using the corner blowing and emptying device of the filter press, including:

[0030] During pressure filtration, the underflow valve 6 is opened and the drain valve 4 is closed. The filtrate water enters the filtrate main pipe 2 through the underflow pipe 1 and the underflow branch pipe 5. During angle blowing, the underflow valve 6 is closed and the drain valve 4 is opened. The pressurized gas-water mixture enters the gas-water mixture separation structure 3 through the feed pipe arranged in an involute shape, without affecting the normal operation of the filtrate main pipe 2. The pressure causes the gas-water mixture to rotate at high speed, thereby generating a centrifugal force. The centrifugal force is directly proportional to the specific gravity. The centrifugal force received by the coal slime water is much greater than that received by the air, resulting in the coal slime water clinging to the inner wall of the cyclone and moving downward under the action of gravity. The coal slime water enters the flotation machine through the discharge port 9 at the bottom of the gas-water mixture separation structure 3. The air accumulates in the center of the cyclone to form an air column, and moves upward from the central pipe of the gas-water mixture separation structure 3 under the action of pressure and is discharged into the atmosphere through the air outlet 8.

[0031] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A corner blowing and emptying device for a filter press, characterized in that: Including: Underflow pipes, a main filtrate pipe, and a gas-water mixture separation structure. One end of each underflow pipe is connected to a filter press, and the other end of each underflow pipe is connected to the gas-water mixture separation structure. An exhaust valve is provided on each underflow pipe. An underflow branch pipe is provided between each underflow pipe and the main filtrate pipe, and an underflow valve is provided on the underflow branch pipe.

2. The corner blowing and emptying device of the filter press according to claim 1, characterized in that: The gas-water mixture separation structure is a hydrocyclone.

3. The corner blowing and emptying device of the filter press according to claim 1, wherein: The feeding trajectory of the feeding pipe of the gas-water mixture separation structure is arranged in an involute shape.

4. The filter press corner blowing and emptying device according to claim 1, wherein: The gas outlet of the gas-water mixture separation structure is located at the center of the top of the gas-water mixture separation structure.

5. The corner blowing and emptying device of the filter press according to claim 1, characterized in that: The discharge port at the bottom of the gas-water mixture separation structure is connected to the flotation feed bucket of a flotation machine.

6. The filter press corner blowing and emptying device according to claim 1, wherein: One end of the underflow branch pipe is connected to the underflow pipe, and the other end of the underflow branch pipe is connected to the main filtrate pipe. The exhaust valve is provided between one end of the underflow branch pipe and the feeding pipe of the gas-water mixture separation structure.

7. The corner blowing and emptying device of the filter press according to claim 1, wherein: The inner diameter of the underflow pipe and the inner diameter of the underflow branch pipe are both smaller than the inner diameter of the main filtrate pipe.

8. The corner blowing and emptying device for a filter press according to claim 1, wherein: Both the underflow valve and the exhaust valve are pneumatic valves.

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