Self-cleaning concentrated sulfuric acid precision filtering device

Abstract

The utility model discloses a self-cleaning concentrated sulfuric acid precision filtering device. The finished product of 98% concentrated flowing acid obtained in an acid making process is often muddy, unclear and opaque, so that the color and the quality of the finished product of acid are influenced. The upper part and the lower part of a cylinder body are connected with end sockets, and an upper fixing plate and a lower fixing plate are arranged in the cylinder body and are connected with each other; the lower fixing plate divides the interior of the barrel into an upper part and a lower part which are not communicated with each other; a filter element assembly is arranged between the upper fixing plate and the lower fixing plate; a liquid discharge air inlet is formed in the top of the upper sealing head; a liquid inlet is formed in the cylinder body; a communicating pipeline is arranged at the bottom of the lower sealing head; a purified acid outlet is formed in the tail end of the communicating pipeline; the water outlet and the drain outlet converge to a main drain outlet; and a branch pipeline is also arranged on the communicating pipeline and is used as an aeration air inlet and a backwashing water inlet. The filter has a good filtering effect, can realize online cleaning and continuous filtering, and is convenient to maintain.

Description

Technical Field

[0001] This utility model belongs to the field of filtration equipment technology, specifically relating to a self-cleaning precision filtration device for concentrated sulfuric acid. Background Technology

[0002] Concentrated sulfuric acid refers to sulfuric acid with a concentration of 98% (i.e., 98 acid). 98 acid is a strong acid with strong corrosive and oxidizing properties. It has strong hygroscopicity, easily absorbs moisture from the air, absorbs a large amount of heat when it comes into contact with water, and can splash.

[0003] The 98% concentrated acid obtained in the acid production process often appears cloudy and opaque, affecting its color and quality. While ceramic filters are used for purification, some ceramic particles may detach after a period of use, resulting in noticeable particulate matter in the acid. Other security filtration equipment is also available, but the filter cartridges cannot be cleaned online, requiring frequent replacements, and the cumbersome and unsafe process of cleaning in different locations is unacceptable. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a self-cleaning precision filter for concentrated sulfuric acid, which has good filtration effect, the filter element can be cleaned online, reused repeatedly, and is easy to maintain.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A self-cleaning precision filter for concentrated sulfuric acid includes a cylindrical body, with an upper end cap connected to the top of the cylindrical body and a lower end cap connected to the bottom of the cylindrical body.

[0007] The cylinder is equipped with an upper fixing plate and a lower fixing plate, which are connected by an upper and lower fixing plate connector; the lower fixing plate separates the interior of the cylinder into two non-communicating parts, upper and lower.

[0008] Multiple filter element assemblies are provided between the upper fixed plate and the lower fixed plate; the top of the filter element assembly is connected to the upper fixed plate through the upper end cap of the filter element, and the bottom of the filter element assembly is connected to the lower fixed plate through the lower end cap of the filter element.

[0009] The top of the upper end cap is provided with a liquid drain and air inlet F6; the cylinder is provided with a liquid inlet F1, which is positioned higher than the upper fixed plate; the bottom of the lower end cap is provided with a connecting pipe, and the end of the connecting pipe is provided with a clean acid outlet F4.

[0010] A drain outlet F3 is provided on the connecting pipe, and drain outlet F3 and sewage outlet F2 converge to the main sewage outlet; sewage outlet F2 is located on the outside of the cylinder, above the lower fixed plate.

[0011] The connecting pipe is also equipped with branch pipes, which serve as the aeration inlet F8 and the backwash inlet F5.

[0012] Furthermore, the outer surface of the filter element cap is provided with threads.

[0013] Furthermore, the outer surface of the lower end cap of the filter element is provided with threads.

[0014] Furthermore, a sealing ring is provided between the lower end cap of the filter element and the lower fixed plate for sealing.

[0015] Furthermore, the cylinder body is connected to both the upper and lower end caps using flanges.

[0016] Furthermore, a pressure gauge F7 is provided on the top of the upper end cap.

[0017] The beneficial effects of this utility model are:

[0018] 1) This utility model adopts a fully enclosed filter, so no particles will fall off during operation, resulting in a good filtration effect;

[0019] 2) The filter element of this utility model is composed of a PTFE hollow membrane tube and upper and lower end caps of the same material. The PTFE filter membrane has a smooth surface and excellent anti-adhesion properties. Under the action of liquid, particles can easily fall off the surface.

[0020] 3) This utility model can achieve online cleaning and continuous filtration, and is easy to maintain. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a structural diagram of the filter element of this utility model;

[0023] Figure 3 This is a process flow diagram of the present invention. Detailed Implementation

[0024] The present invention will now be described in detail with reference to specific embodiments.

[0025] like Figure 1 As shown, this utility model includes a cylindrical body, with an upper end cap connected to the top of the cylindrical body and a lower end cap connected to the bottom of the cylindrical body. The cylindrical body is connected to both the upper and lower end caps by flanges. A pressure gauge F7 is installed on the top of the upper end cap.

[0026] The cylinder is equipped with an upper fixed plate and a lower fixed plate, which are connected by an upper and lower fixed plate connector. The upper and lower fixed plate connector includes a PTFE (PVDF) material screw and nut. The lower fixed plate separates the inside of the cylinder into two non-communicating upper and lower parts.

[0027] Multiple filter element assemblies are arranged between the upper fixed plate and the lower fixed plate; the top of the filter element assembly is connected to the upper fixed plate through the upper end cap of the filter element, and the bottom of the filter element assembly is connected to the lower fixed plate through the lower end cap of the filter element.

[0028] like Figure 2 As shown, the filter element assembly includes multiple PTFE hollow membrane tubes with a diameter of 6mm; the upper end cap of the filter element is not connected to the inside and outside, while the lower end cap is connected to the inside and outside; a single tube can withstand an external pressure of up to 0.2Mpa; the PTFE filter membrane has a smooth surface and excellent anti-adhesion properties, and particles can easily detach from the surface under the action of liquid; the upper fixing plate is made of steel plate with PTFE sprayed on the entire surface, and the lower fixing plate is made of PTFE material sheet;

[0029] The upper end cap of the filter element is a stepped cylinder with threads on its outer surface. It is connected to the upper fixing plate using a filter element fixing nut. The lower end cap is also a stepped cylinder with threads on its outer surface. A fluororubber sealing ring is used between the lower end cap and the lower fixing plate to ensure isolation between the waste acid and the clean acid. Both the upper and lower end caps are made of PTFE material.

[0030] The equipment is equipped with a rocker arm on top. The rocker arm is a common quick-opening device. When the equipment diameter is small, it can be equipped with quick-release bolts to facilitate the convenient and quick installation and removal of internal components.

[0031] The top of the upper end cap is provided with a liquid drain and air inlet F6; the cylinder is provided with a liquid inlet F1, which is positioned higher than the upper fixed plate; the bottom of the lower end cap is provided with a connecting pipe, and the end of the connecting pipe is provided with a clean acid outlet F4.

[0032] A drain outlet F3 is provided on the connecting pipe, and drain outlet F3 and sewage outlet F2 converge to the main sewage outlet; sewage outlet F2 is located on the outside of the cylinder, above the lower fixed plate.

[0033] The connecting pipe is also equipped with branch pipes, which serve as the aeration inlet F8 and the backwash inlet F5.

[0034] like Figure 3 As shown, the opening, filtering, backwashing, and purging processes of this utility model are all completed automatically, realizing solid-liquid separation and automatic backwashing. The specific process is as follows:

[0035] 1) Filtration: 98% sulfuric acid containing solids is pumped into a high-level tank (set on-site) using an inlet pump. The solution then flows smoothly into a concentrated acid precision filter. The filtrate flows out from the filter's clean acid outlet F4. Solids are trapped on the surface of the filter element. When the filter cake reaches a certain thickness, the pressure inside the filter's upper cylinder increases, and the inlet stops.

[0036] 2) Open the air inlet valve F6. When the gas pressure is slightly higher than the pressure gauge's stop liquid inlet value, the liquid in the upper cylinder of the filter will continue to be filtered by the gas. When no liquid is discharged from the acid outlet F4, close the acid outlet valve. Open the backwash inlet valve F5. The washing liquid enters from inside the filter element. When the washing liquid level submerges the upper part of the filter element, stop the washing liquid and start the air intake. The solid matter remaining on the surface of the filter element will be removed from the filter element surface by the continuous cleaning of the washing liquid and gas. After the filter membrane surface is clean, turn off the gas source and open the drain valve F2. The sewage will flow out from the drain valve and can be sent to the sewage treatment plant for further treatment.

[0037] 3) The cleaned filter element has been regenerated:

[0038] 4) After the waste liquid has been drained, clean air can be used to purge until there is no moisture inside the cylinder. The drying air pressure is about 0.15 MPa.

[0039] 5) After purging is complete, open the liquid inlet valve and the acid outlet valve, and close the other valves to enter the next cycle.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The content of this utility model is not limited to the embodiments listed. Any equivalent modifications made by those skilled in the art to the technical solution of this utility model after reading this utility model specification shall be covered by the claims of this utility model.

Claims

1. A self-cleaning precision filter for concentrated sulfuric acid, characterized in that: Includes a cylindrical body, with an upper end cap connected to the top of the cylindrical body and a lower end cap connected to the bottom of the cylindrical body; The cylinder is equipped with an upper fixing plate and a lower fixing plate, which are connected by an upper and lower fixing plate connector; the lower fixing plate separates the interior of the cylinder into two non-communicating parts, upper and lower. Multiple filter element assemblies are provided between the upper fixed plate and the lower fixed plate; the top of the filter element assembly is connected to the upper fixed plate through the upper end cap of the filter element, and the bottom of the filter element assembly is connected to the lower fixed plate through the lower end cap of the filter element. The top of the upper end cap is provided with a liquid drain and air inlet F6; the cylinder is provided with a liquid inlet F1, which is positioned higher than the upper fixed plate; the bottom of the lower end cap is provided with a connecting pipe, and the end of the connecting pipe is provided with a clean acid outlet F4. A drain outlet F3 is provided on the connecting pipe, and drain outlet F3 and sewage outlet F2 converge to the main sewage outlet; sewage outlet F2 is located on the outside of the cylinder, above the lower fixed plate. The connecting pipe is also equipped with branch pipes, which serve as the aeration inlet F8 and the backwash inlet F5.

2. The self-cleaning concentrated sulfuric acid precision filtration device according to claim 1, characterized in that: The outer surface of the filter element's upper end cap is provided with threads.

3. The self-cleaning concentrated sulfuric acid precision filtration device according to claim 2, characterized in that: The outer surface of the lower end cap of the filter element is provided with threads.

4. The self-cleaning concentrated sulfuric acid precision filtration device according to claim 3, characterized in that: A sealing ring is provided between the lower end cap of the filter element and the lower fixed plate for sealing.

5. A self-cleaning concentrated sulfuric acid precision filtration device according to claim 4, characterized in that: The cylinder body is connected to both the upper and lower end caps using flanges.

6. The self-cleaning concentrated sulfuric acid precision filtration device according to claim 5, characterized in that: A pressure gauge F7 is installed on the top of the upper end cap.

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