Immersed disc slurry purification device

Abstract

The invention discloses an immersed disc slurry purification device, comprising an absorption tower, a slurry tank, a vacuum pump, a gas-liquid separation tank, a clean water tank, a tank body, a main shaft located in the tank body, a plurality of filtrate tubes, a plurality of filter discs, and a driving device for driving all the filter discs to rotate circumferentially and the main shaft to rotate; each filter disc is a fan-shaped structure, and the filter disc is provided with an inner cavity, a filter cloth is sleeved on the outer wall of the filter disc, and the liquid in the tank body enters the inner cavity after being filtered by the filter cloth, and each filter disc is sequentially distributed around the main shaft along the circumferential direction, and a blowing channel and a vacuum channel are provided in the main shaft, and the device can realize concentrated filtration of low-density slurry and is not easy to be blocked.

Description

Technical Field

[0001] The invention belongs to the technical field of energy conservation and environmental protection, and relates to an immersion type disc slurry purification device. Background Art

[0002] In the wet flue gas desulfurization process of thermal power plants, under low load conditions, the desulfurization system of the unit may have poor water balance problems, which will affect the normal flushing of the demister. Long-term operation will cause the demister resistance to increase or even blockage and collapse, affecting the safety of the unit operation.

[0003] The existing disc dehydrator solid-liquid separation equipment is mainly used for the removal of large-particle gypsum. The micropores of the device are poorly applicable to low-density gypsum slurry and are easily blocked, making it unsuitable for extracting the filtrate of low-density gypsum slurry. Summary of the invention

[0004] The object of the present invention is to overcome the disadvantages of the prior art and to provide an immersed disc slurry purification device which can achieve concentrated filtration of low-density slurry and is not prone to clogging.

[0005] To achieve the above-mentioned purpose, the immersion disc slurry purification device of the present invention comprises an absorption tower, a slurry tank, a vacuum pump, a gas-liquid separation tank, a clean water tank, a tank body, a main shaft located in the tank body, a plurality of filtrate tubes, a plurality of filter discs, and a driving device for driving all filter discs to rotate in the circumferential direction and the main shaft to rotate;

[0006] Each filter disc is a fan-shaped structure, and is provided with an inner cavity. A filter cloth is sleeved on the outer wall of the filter disc. The liquid in the tank body enters the inner cavity after being filtered by the filter cloth. Each filter disc is sequentially distributed around the main shaft along the circumferential direction. A blowing channel and a vacuum channel are provided in the main shaft, wherein a vacuum port is provided at the bottom of the side of the main shaft, and a blowing port is provided at the top of the side of the main shaft. One of the filter discs corresponds to a filtrate tube, wherein one end of the filtrate tube is connected to the inner cavity of the filter disc, and during the rotation of each filter disc, the other end of the filtrate tube is alternately connected to the blowing port and the vacuum port;

[0007] One end of the blowing channel is connected to the blowing port, and the other end of the blowing channel is connected to the gas storage tank;

[0008] One end of the vacuum channel is connected to the vacuum port, the other end of the vacuum channel is connected to the inlet of the gas-liquid separation tank, the inlet of the vacuum pump is connected to the gas outlet of the gas-liquid separation tank, and the liquid outlet of the gas-liquid separation tank is connected to the clean water tank;

[0009] The outlet of the absorption tower is connected to the water injection port of the tank body, and the inlet of the slurry tank is connected to the discharge port at the bottom of the tank body;

[0010] An ultrasonic cleaning device and a scraper for scraping off gypsum particles on the filter cloth are provided in the tank body, and the filter disc passes through the scraper and the ultrasonic cleaning device in sequence during the rotation process;

[0011] The scraper and the ultrasonic cleaning device are both located above the main shaft, and the filter disc passes through the scraper and the ultrasonic cleaning device in sequence during the rotation process.

[0012] It also includes a high-pressure water supply system and a high-pressure flushing nozzle arranged in the tank body, wherein the outlet of the high-pressure water supply system is connected to the inlet of the high-pressure flushing nozzle.

[0013] The outlet of the slurry box is connected to the inlet of the absorption tower.

[0014] The buffer box is connected with the tank body through the slurry supply pump.

[0015] The present invention has the following beneficial effects:

[0016] During the specific operation of the immersed disc slurry purification device described in the present invention, the slurry output from the absorption tower enters the buffer tank, and then is output to the tank body through the slurry supply pump. Each filter disc is located in the slurry. The slurry enters the inner cavity of the filter disc after being filtered by the filter cloth. During the rotation of each filter disc, the filter disc rotates to the bottom of the main shaft, and the vacuum port is connected to the filtrate pipe. At this time, the slurry after filtering in the filter disc is sucked by the vacuum pump, and then separated by the gas-liquid separation tank. The separated liquid enters the clean water tank to achieve concentrated filtration of low-density slurry. In this process, the gypsum particles on the filter cloth are removed by the scraper and the ultrasonic cleaning device. When the gypsum concentration rises to 1150kg / m 3 After that, the slurry in the tank is drained, and then the filter cloth is flushed from the inside to the outside by compressed air, and the outside of the filter cloth is flushed by high-pressure water to avoid clogging of the filter cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 This is a diagram showing the installation positions of the scraper 7 and the high-pressure washing nozzle 9 in the present invention.

[0019] Among them, 1 is a buffer box, 2 is a water injection port, 3 is a tank body, 4 is a main shaft, 5 is a filter disc, 6 is a vacuum port, 7 is a scraper, 8 is an ultrasonic cleaning device, 9 is a high-pressure flushing nozzle, 10 is an overflow port, 11 is a discharge port, 12 is a slurry box, 13 is a vacuum pump, 14 is a gas-liquid separation tank, 15 is a clean water tank, 16 is a gas storage tank, and 17 is an air blowing port. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0021] refer to Figure 1 and Figure 2 The immersion disc slurry purification device of the present invention comprises an absorption tower, a slurry tank 12, a vacuum pump 13, a gas-liquid separation tank 14, a clean water tank 15, a tank body 3 and a main shaft 4 located in the tank body 3, a plurality of filtrate tubes, a plurality of filter discs 5 and a driving device for driving all filter discs to rotate circumferentially and the main shaft 4 to rotate; each filter disc 5 is a fan-shaped structure, and the filter disc 5 is provided with an inner cavity, and a filter cloth is sleeved on the outer wall of the filter disc 5, and the liquid in the tank body 3 enters the inner cavity after being filtered by the filter cloth, and each filter disc 5 is sequentially distributed around the main shaft 4 along the circumferential direction, and a blowing channel and a vacuum channel are provided in the main shaft 4, wherein a vacuum port 6 is provided at the bottom of the side of the main shaft 4, and a blowing port 17 is provided at the top of the side of the main shaft 4, and one filter disc 5 corresponds to a filtrate tube, wherein one end of the filtrate tube is connected to the filter disc 5 The inner cavity of each filter disc 5 is connected, and during the rotation process, the other end of the filtrate tube is alternately connected with the blowing port 17 and the vacuum port 6; one end of the blowing channel is connected with the blowing port 17, and the other end of the blowing channel is connected with the gas storage tank 16; one end of the vacuum channel is connected with the vacuum port 6, and the other end of the vacuum channel is connected with the inlet of the gas-liquid separation tank 14, the inlet of the vacuum pump 13 is connected with the gas outlet of the gas-liquid separation tank 14, and the liquid outlet of the gas-liquid separation tank 14 is connected with the clean water tank 15; the outlet of the absorption tower is connected with the water injection port 2 of the tank body 3, and the inlet of the slurry box 12 is connected with the discharge port 11 at the bottom of the tank body 3; an ultrasonic cleaning device 8 and a scraper 7 for scraping gypsum particles on the filter cloth are arranged in the tank body 3, and the filter disc 5 passes through the scraper 7 and the ultrasonic cleaning device in sequence during the rotation process.

[0022] The scraper 7 and the ultrasonic cleaning device 8 are both located above the main shaft, and the filter disc 5 passes through the scraper 7 and the ultrasonic cleaning device 8 in sequence during rotation; the present invention also includes a high-pressure water supply system and a high-pressure flushing nozzle 9 arranged in the tank body 3, wherein the outlet of the high-pressure water supply system is connected to the inlet of the high-pressure flushing nozzle 9; the outlet of the slurry box 12 is connected to the inlet of the absorption tower; the buffer box 1 is connected to the tank body 3 via a slurry supply pump.

[0023] The specific operation process of the present invention is:

[0024] The slurry output from the absorption tower enters the buffer tank 1, and then is output to the tank body 3 through the slurry supply pump. Each filter disc 5 is located in the slurry. The slurry enters the inner cavity of the filter disc after being filtered by the filter cloth. The filter cloth is an ultra-fine filter cloth to ensure that the solid content of the slurry filtered by the filter cloth meets the standard requirements of the defogger flushing water (total suspended solids <1000 mg / L). During the rotation of each filter disc 5, the filter disc 5 rotates to the bottom of the main shaft 4, and the vacuum port 6 is connected to the filtrate pipe. At this time, the slurry filtered in the filter disc 5 is sucked by the vacuum pump 13, and then separated by the gas-liquid separation tank 14. The separated liquid enters the clean water tank 15, and the separated gas enters the vacuum pump 13. When passing above the main shaft 4, the gypsum particles on the filter cloth are first scraped off by the scraper 7, and then ultrasonically cleaned by the ultrasonic cleaning device 8;

[0025] When the gypsum concentration increases to 1150kg / m 3 After that, when the filter cloth needs to be cleaned for the second time, the slurry in the tank body 3 is drained into the slurry box 12, so that the slurry in the tank body 3 is drained, and the air storage tank 16 is opened, the main shaft 4 rotates, and when the filtrate pipe is aligned and connected with the blowing port 17, the filter cloth is blown from the inside to the outside by the compressed air in the air storage tank 16, and the filter cloth is flushed with high-pressure water sprayed from the high-pressure flushing nozzle 9 at the same time, so as to realize the secondary deep cleaning of the filter cloth, ensure the removal of residual fine particles in the filter cloth, and prevent the ultra-fine filter cloth from being blocked.

Claims

1. An immersion disc slurry purification device, characterized in that: It comprises an absorption tower, a slurry tank (12), a vacuum pump (13), a gas-liquid separation tank (14), a clean water tank (15), a tank body (3), a main shaft (4) located in the tank body (3), a plurality of filtrate tubes, a plurality of filter discs (5), and a driving device for driving all the filter discs to rotate in a circumferential direction and the main shaft (4) to rotate; Each filter disc (5) is a fan-shaped structure, and is provided with an inner cavity. A filter cloth is sleeved on the outer wall of the filter disc (5). The liquid in the tank body (3) is filtered by the filter cloth and enters the inner cavity. Each filter disc (5) is sequentially distributed around the main shaft (4) along the circumferential direction. The main shaft (4) is provided with a blowing channel and a vacuum channel. A vacuum port (6) is provided at the bottom of the side of the main shaft (4), and a blowing port (17) is provided at the top of the side of the main shaft (4). One filter disc (5) corresponds to a filtrate tube, wherein one end of the filtrate tube is connected to the inner cavity of the filter disc (5). During the rotation of each filter disc (5), the other end of the filtrate tube is alternately connected to the blowing port (17) and the vacuum port (6). One end of the blowing channel is connected to the blowing port (17), and the other end of the blowing channel is connected to the air storage tank (16); One end of the vacuum channel is connected to the vacuum port (6), the other end of the vacuum channel is connected to the inlet of the gas-liquid separation tank (14), the inlet of the vacuum pump (13) is connected to the gas outlet of the gas-liquid separation tank (14), and the liquid outlet of the gas-liquid separation tank (14) is connected to the clean water tank (15); The outlet of the absorption tower is connected to the water injection port (2) of the tank body (3), and the inlet of the slurry tank (12) is connected to the discharge port (11) at the bottom of the tank body (3); An ultrasonic cleaning device (8) and a scraper (7) for scraping off gypsum particles on the filter cloth are arranged in the tank body (3); the filter disc (5) passes through the scraper (7) and the ultrasonic cleaning device in sequence during the rotation process.

2. The immersed disc slurry purification device according to claim 1, characterized in that: The scraper (7) and the ultrasonic cleaning device (8) are both located above the main shaft, and the filter disc (5) passes through the scraper (7) and the ultrasonic cleaning device (8) in sequence during the rotation process.

3. The immersed disc slurry purification device according to claim 1, characterized in that: It also comprises a high-pressure water supply system and a high-pressure flushing nozzle (9) arranged in the tank body (3), wherein the outlet of the high-pressure water supply system is connected to the inlet of the high-pressure flushing nozzle (9).

4. The immersed disc slurry purification device according to claim 1, characterized in that: The outlet of the slurry tank (12) is communicated with the inlet of the absorption tower.

5. The immersed disc slurry purification device according to claim 1, characterized in that: The buffer box (1) is connected to the tank body (3) via a slurry supply pump.

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