Automatic switching precision filtering system

Abstract

The utility model relates to an automatic switching precision filtering system, and belongs to the field of filtering equipment. The system comprises two filters which are arranged in parallel, an inlet regulating valve and an inlet pressure gauge are arranged at an inlet of each filter, and an outlet regulating valve and an outlet pressure gauge are arranged at an outlet of each filter; the filter comprises a filter body, an anti-overflow tank, an exhaust line and a quick-closing regulating valve, the top of the filter body is connected with the anti-overflow tank through the quick-closing regulating valve, the top of the anti-overflow tank is connected with the exhaust line, and a liquid level meter is arranged on the anti-overflow tank. According to the utility model, except that the filter element of the filter needs to be manually replaced, other steps can be automatically operated and monitored, the workload of an outdoor operator is reduced, and main valves and instruments can be subjected to program setting according to operation logic, so that the work of automatic switching and standby exhaust is completed.

Description

Technical Field

[0001] The utility model relates to a precision filtration system with automatic switching, belonging to the field of filtration equipment. Background Art

[0002] The production process flow of methacrylic acid: tert-butanol is mixed with air, water and inert gas in proportion and then undergoes catalytic reaction in the first reactor to generate methacrolein. The reaction product gas is quenched and washed with water to absorb the generated methacrolein. Part of the tail gas is recycled to the first reactor as inert gas, and the rest is sent to the catalytic incinerator. The absorbed methacrolein aqueous solution is sent to the vaporization tower through rectification separation to participate in the ratio of the second reaction. After being mixed with air, water and inert gas, it undergoes catalytic reaction in the second reactor to generate methacrylic acid. Similarly, the methacrylic acid aqueous solution after quenching and absorption passes through a liquid-phase filter to filter out solid terephthalic acid, and a pure methacrylic acid aqueous solution is obtained.

[0003] Because terephthalic acid is slightly soluble in water, there is still a small amount of water-soluble terephthalic acid in the methacrylic acid aqueous solution filtered by the liquid-phase filter. After the methacrylic acid aqueous solution is extracted and dehydrated with toluene, terephthalic acid will separate out in the form of solid, blocking the subsequent separation equipment, resulting in a series of problems such as short operation cycle of the device, high steam consumption, high raw material consumption, and high inspection and maintenance costs. Therefore, a self-switching precision filtration system is added between the extractant recovery tower and the light component removal tower to filter out solid terephthalic acid and ensure the normal operation of the device. Summary of the Invention

[0004] According to the problems described in the background, the problem to be solved by the utility model is:

[0005] Add a self-switching precision filtration system between the extractant recovery tower and the light component removal tower to filter out solid terephthalic acid, ensure the normal operation of the device, and do not increase the maintenance difficulty of the operators.

[0006] To achieve the above object, the utility model provides the following technical solutions:

[0007] A precision filtration system with automatic switching, the system includes two filters, the two filters are arranged in parallel, an inlet regulating valve and an inlet pressure gauge are provided at the inlet of the filter, and an outlet regulating valve and an outlet pressure gauge are provided at the outlet of the filter; the filter includes a filter body, an anti-overflow tank, an exhaust line and a quick shut-off regulating valve. The top of the filter body is connected to the anti-overflow tank through the quick shut-off regulating valve, the top of the anti-overflow tank is connected to the exhaust line, and a liquid level gauge is provided on the anti-overflow tank.

[0008] Preferably, quick shut-off regulating valves are directly provided on the anti-overflow tank and the exhaust line. Whether to set this valve is selected according to the material properties. If there is no negative impact when the material is in long-term contact with air, this valve can be not set.

[0009] Preferably, the liquid level gauge is electrically connected to the quick closing regulating valve. When a liquid level appears in the anti-overflow tank, it proves that the gas in the filter has been discharged. By using the quick closing regulating valve, the passage between the filter and the exhaust line can be closed in time, and the effect of preventing material overflow is obvious, without the need for special personnel to guard.

[0010] Preferably, the inlet pressure gauge and the outlet pressure gauge calculate the pressure difference through the DCS operating system, and are electrically connected to the inlet regulating valve and the outlet regulating valve through the DCS operating system. By using common control logics and control methods, it is ensured that the equipment can operate automatically or be manually adjusted, improving the stability of equipment operation.

[0011] According to the pressure difference between the inlet and outlet of the filter, it is determined whether the filter needs to be switched. When the pressure difference reaches the set value, the switching procedure is automatically executed. The inlet regulating valve and the outlet regulating valve of the standby filter are opened and put into use. After the flow rate is stable, the inlet regulating valve and the outlet regulating valve of the filter in use are closed. After the filter is taken out of service, contact the equipment maintenance personnel to clean the filter and replace the filter element. After cleaning, the operator manually starts the procedure of switching to standby, slightly opens the outlet regulating valve of the filter to be switched in, and at the same time opens the quick closing regulating valve to exhaust the air in the filter. When the liquid level is detected in the anti-overflow tank, it proves that the filter is filled with material, the exhaust is completed, the quick closing regulating valve is closed, and finally the outlet regulating valve of this filter is closed to complete the switching to standby. According to the different properties of the material, operations such as nitrogen replacement can be carried out before exhausting the air in the filter to replace the gas environment in the filter.

[0012] The beneficial effects of the present utility model are:

[0013] Except for manually replacing the filter element of the present utility model, other steps can all achieve automatic operation and monitoring, reducing the workload of outdoor operators. Moreover, the main valves and instruments can be programmed according to the operation logic to complete the work of automatic switching and exhausting standby.

[0014] The present utility model is provided with an anti-overflow tank, which can prevent materials from leaking, wasting, polluting or causing safety accidents during the exhaust process; it is an effective safety guarantee for preventing overflow of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a precision filtration system for automatic switching

[0016] In the figure: 1 is the filter body; 2 is the inlet regulating valve; 3 is the outlet regulating valve; 4 is the inlet pressure gauge; 5 is the outlet pressure gauge; 6 is the anti-overflow tank; 7 is the exhaust line; 8 is the liquid level gauge; 9 is the quick closing regulating valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Embodiment 1

[0018] An automatically switched precision filtration system, this system includes two filters, the two filters are arranged in parallel, an inlet regulating valve 2 and an inlet pressure gauge 4 are provided at the inlet of the filter, and an outlet regulating valve 3 and an outlet pressure gauge 5 are provided at the outlet of the filter; the filter includes a filter body 1, an overflow prevention tank 6, an exhaust line 7 and a quick closing regulating valve 9, the top of the filter body 1 is connected to the overflow prevention tank 6 through the quick closing regulating valve 9, the top of the overflow prevention tank 6 is connected to the exhaust line 7, and a liquid level gauge 8 is provided on the overflow prevention tank 6.

[0019] The overflow prevention tank 6 and the exhaust line 7 are directly provided with a quick closing regulating valve 9.

[0020] The liquid level gauge 8 is electrically connected to the quick closing regulating valve 9.

[0021] The inlet pressure gauge 4 and the outlet pressure gauge 5 calculate the pressure difference through the DCS operating system, and are electrically connected to the inlet regulating valve 2 and the outlet regulating valve 3 through the DCS operating system.

[0022] Except for manually replacing the filter element, other steps of the present utility model can achieve automatic operation and monitoring, reducing the work burden of outdoor operators, and the main valves and instruments can be program - set according to the operation logic to complete the work of automatic switching and exhaust standby.

[0023] The present utility model is provided with an overflow prevention tank 6, which can prevent materials from causing leakage, waste, pollution or safety accidents during the exhaust process; it is an effective safety guarantee for preventing overflow of the filter.

Claims

1. A precision filtration system with automatic switching, characterized in that, This system includes two filters, and the two filters are arranged in parallel. An inlet regulating valve (2) and an inlet pressure gauge (4) are provided at the inlet of the filter, and an outlet regulating valve (3) and an outlet pressure gauge (5) are provided at the outlet of the filter; the filter includes a filter body (1), an overflow prevention tank (6), an exhaust line (7) and a quick closing regulating valve (9). The top of the filter body (1) is connected to the overflow prevention tank (6) through the quick closing regulating valve (9), the top of the overflow prevention tank (6) is connected to the exhaust line (7), and a liquid level gauge (8) is provided on the overflow prevention tank (6).

2. The automatic switching precision filtration system according to claim 1, wherein A quick closing regulating valve (9) is directly provided on the overflow prevention tank (6) and the exhaust line (7).

3. The automatic switching precision filtration system according to claim 1, characterized in that, The liquid level gauge (8) is electrically connected to the quick closing regulating valve (9).

4. An automatically switched precision filtration system according to claim 1, characterized in that, The inlet pressure gauge (4) and the outlet pressure gauge (5) calculate the pressure difference through the DCS operating system, and are electrically connected to the inlet regulating valve (2) and the outlet regulating valve (3) through the DCS operating system.

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