Catalyst extracting and screening device

Abstract

The invention discloses a catalyst extracting and screening device which comprises an extracting and removing pipe, an inlet of the extracting and removing pipe is communicated with catalyst equipment to be extracted and removed, an outlet of the extracting and removing pipe is communicated with an inlet of a cyclone separator, and an outlet of the cyclone separator is sequentially communicated with an alkali sealing tank, a water sealing tank, a vacuum pump and an emptying pipeline; the bottom of the cyclone separator is communicated with a drum screen, an inclined screen plate is arranged in the drum screen, the side part of the drum screen above the high position of the screen plate is communicated with a coarse grain outlet pipe, and the bottom of the drum screen is sequentially communicated with a catalyst storage hopper and a fine material outlet pipe. According to the device, the pumped catalyst is screened by the drum screen, the screening process is time-saving and labor-saving, and after light impurities such as dust carried by the catalyst are absorbed by the alkali-sealed tank and the water-sealed tank, the residual gas impurities are discharged through the emptying pipeline communicated with the outlet of the vacuum pump, so that the dust carried by the catalyst cannot pollute the environment; and the vacuum pump inlet regulating valve, the pressure transmitter and the vacuum pump are interlocked, so that intelligent automatic control is realized.

Description

Technical Field

[0001] The invention relates to the field of catalyst screening equipment, and in particular to a catalyst extraction and screening device. Background Art

[0002] A catalyst, also known as a catalyst, is a substance that changes the reaction rate but does not change the total standard Gibbs free energy of the reaction. It can change (speed up or slow down) the chemical reaction rate of other substances in a chemical reaction, while its own quality and chemical properties do not change before and after the reaction (they will change during the reaction). It is usually widely used in organic chemical production processes.

[0003] During the use of catalysts, they may be affected by various factors and lose their activity rapidly or slowly. The causes of catalyst deactivation are divided into the following categories: (1) Permanent deactivation, in which the active components of the catalyst lose their activity due to the action of certain foreign components, which is often permanent deactivation. These foreign components often undergo chemical reactions or ion exchange with the active components of the catalyst, causing changes in the active components, such as acidic catalysts being neutralized by alkali, sulfides or nitrides causing poisoning of precious metal catalysts, etc. The deactivation of catalysts due to poisoning is often manifested as a rapid decrease in activity. Active components may also be lost due to wear or sublimation during use, which may also lead to permanent deactivation. This type of deactivation is often difficult to simply recover. (2) Active components are gradually deactivated due to being covered, which is non-permanent deactivation. For example, carbon deposits and dust generated during the reaction process cover the active components or block the pores of the catalyst, making it impossible for the reactants to contact the active components. These coverings can be removed by certain methods. For example, deactivation due to carbon deposits can be revived by burning carbon. (3) Catalyst deactivation caused by incorrect operation, such as excessively high reaction temperature, drastic pressure fluctuations leading to disorder or crushing of the catalyst bed, etc. This type of deactivation cannot be recovered.

[0004] After the catalyst is deactivated, it is usually necessary to replace it in a timely manner. The current method of replacing the catalyst is to manually open the equipment and overturn it. However, the following problems are prone to occur during the overturning process: (1) The dust mixed in the process of manual overturning will pollute the environment, resulting in poor working environment conditions. In addition, most catalysts are toxic and harmful substances, which will cause irreversible damage to the health of operators; (2) Manual overturning is inefficient, time-consuming and labor-intensive, which will prolong the catalyst replacement time and cause high-load production of the chemical system; (3) Manual overturning causes great mechanical damage to the catalyst, resulting in serious waste of catalyst and increased chemical production costs. Summary of the invention

[0005] The present invention provides a catalyst extraction and screening device, which aims to solve the problem that manual overturning and replacement of catalysts is time-consuming and labor-intensive, causing high-load production of chemical systems, and overturning causes great damage to the catalyst, and toxic and harmful substances affect the environment and the health of operators.

[0006] To achieve its purpose, the present invention adopts the following technical solution: A catalyst extraction and screening device comprises an extraction pipe, wherein the extraction pipe inlet is connected to a catalyst device to be extracted, the extraction pipe outlet is connected to a cyclone separator inlet, and the cyclone separator outlet is connected to an alkali sealing tank, a water sealing tank, a vacuum pump and a venting pipe in sequence; the top of the alkali sealing tank is connected to an alkali replenishment pipe, the top of the water sealing tank is connected to a water replenishment pipe, and the bottoms of the alkali sealing tank and the water sealing tank are both connected to a wastewater discharge pipe; The bottom of the cyclone separator is connected to a drum screen, in which an inclined sieve plate is arranged, and the side of the drum screen above the high position of the sieve plate is connected to the coarse particle outlet pipe, and the bottom of the drum screen is connected to the catalyst storage hopper and the fine material outlet pipe in sequence; The inlet pipe of the vacuum pump is provided with a vacuum pump inlet regulating valve and a pressure transmitter in sequence; the pressure transmitter is electrically connected to the signal input end of the PLC programmable controller, and the signal output end of the PLC programmable controller is electrically connected to the vacuum pump inlet regulating valve and the vacuum pump respectively.

[0007] Furthermore, the liquid filling amount of the alkali-sealed tank and the water-sealed tank is 65-85% of the total volume of the tank body.

[0008] Furthermore, the pressure of the pressure transmitter is -0.6 to -0.1 MPa.

[0009] Further, the screen plate is detachable.

[0010] Furthermore, the inclination angle of the sieve plate is 30 to 45 degrees.

[0011] Furthermore, the extraction pipe, the cyclone separator, the alkali sealing tank, the water sealing tank and the vacuum pump are all connected through a gas phase pipeline.

[0012] Furthermore, the extraction pipe is a hose.

[0013] Further, the drum screen is driven by a three-phase asynchronous motor.

[0014] Furthermore, valves are provided on the inlet and outlet of the alkali sealing tank, the inlet and outlet of the water sealing tank, the wastewater discharge pipeline, the alkali replenishment pipeline and the water replenishment pipeline.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. Utilize the extraction and screening device provided by the present invention, the extracted catalyst is first sent into the cyclone separator and then separated by gravity into the drum screen for screening, after screening, the reusable catalyst enters the catalyst storage bucket and flows to the fine material outlet pipe for collection, and the non-reusable agglomerated catalyst is screened to the coarse particle outlet pipe for storage and processing, and the screening process is time-saving and labor-saving. Moreover, the light impurities such as dust carried by the catalyst are first absorbed by the gas phase pipeline arranged in the device through the alkali sealing tank and the water sealing tank, and the remaining gas impurities after absorption are discharged through the venting pipeline connected to the vacuum pump outlet, ensuring that the dust carried by the catalyst will not pollute the environment, and the toxic and harmful substances of the catalyst will not damage the health of the staff after being absorbed. At the same time, the vacuum pump inlet regulating valve, pressure transmitter and vacuum pump are interlocked through the PLC programmable controller to realize intelligent automatic control, and remote operation is convenient and fast.

[0016] 2. The catalyst extraction and screening device provided by the present invention uses a hose as the extraction pipe connected to the inlet of the cyclone separator, which ensures that it can be flexibly connected to different devices to be extracted with catalysts, has a wide range of applications, and is highly practical. The sieve plate is detachable and easy to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the extraction and screening device of the present invention; In the figure: 1-extraction pipe; 2-gas phase pipeline; 3-cyclone separator; 4-drum screen; 5-coarse particle outlet pipe; 6-catalyst storage hopper; 7-fine material outlet pipe; 8-alkali sealing tank; 9-water sealing tank; 10-wastewater discharge pipeline; 11-alkali replenishment pipeline; 12-water replenishment pipeline; 13-vacuum pump inlet regulating valve; 14-pressure transmitter; 15-vacuum pump; 16-venting pipeline; 17-sieve plate. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1 As shown, the present invention is a catalyst extraction and screening device, including an extraction pipe 1, the extraction pipe 1 is a hose, the inlet of the extraction pipe 1 is connected to the catalyst equipment to be extracted, the outlet of the extraction pipe 1 is connected to the inlet of the cyclone separator 3 through the gas phase pipeline 2, and the outlet of the cyclone separator 3 is sequentially connected to the alkali sealing tank 8, the water sealing tank 9, the vacuum pump 15 and the venting pipeline 16 through the gas phase pipeline 2; the top of the alkali sealing tank 8 is connected to the alkali replenishment pipeline 11, the top of the water sealing tank 9 is connected to the water replenishment pipeline 12, and the bottoms of the alkali sealing tank 8 and the water sealing tank 9 are both connected to the wastewater discharge pipeline 10. Among them, valves are provided on the inlet and outlet of the alkali sealing tank 8, the inlet and outlet of the water sealing tank 9, the wastewater discharge pipeline 10, the alkali replenishment pipeline 11 and the water replenishment pipeline 12.

[0019] The bottom of the cyclone separator 3 is connected to a drum screen 4, which is driven by a three-phase asynchronous motor and has a switch operating column on site. A 45° detachable sieve plate 17 is provided inside the drum screen 4, and the aperture of the sieve plate 17 is 2 mm. The side of the drum screen 4 above the high position of the sieve plate 17 is connected to the coarse particle outlet pipe 5, and the bottom of the drum screen 4 is connected to the catalyst storage hopper 6 and the fine material outlet pipe 7 in sequence. The catalyst to be screened is extracted and fed from the high position of the drum screen 4 and screened to the low position. The reusable catalyst is screened and enters the catalyst storage hopper 6 and flows into the fine material outlet pipe 7 for collection, and the non-reusable agglomerated catalyst is intercepted on the sieve plate 17 and flows into the coarse particle outlet pipe for storage and processing.

[0020] The inlet pipe of the vacuum pump 15 is provided with a vacuum pump inlet regulating valve 13 and a pressure transmitter 14 in sequence; the pressure transmitter 14 is electrically connected to the signal input end of the PLC programmable controller, and the signal output end of the PLC programmable controller is electrically connected to the vacuum pump inlet regulating valve 13 and the vacuum pump 15 respectively. During operation, the pressure transmitter 14 monitors the pressure of the vacuum pump 15 in real time. When the pressure transmitter 14 detects that the pressure of the vacuum pump 15 is at the set value, the signal is transmitted to the PLC programmable controller, and the PLC programmable controller receives the signal to control the vacuum pump inlet regulating valve 13 to open, and the vacuum pump 15 operates normally; when the pressure transmitter 14 detects that the pressure of the vacuum pump 15 deviates from the set value, the signal is transmitted to the PLC programmable controller, and the PLC programmable controller receives the signal to control the vacuum pump inlet regulating valve 13 to close, and the vacuum pump 15 stops running and is overhauled, thereby realizing signal interlocking and performing remote operation, ensuring that the negative pressure of the vacuum pump 15 is stable, and automatically protecting the vacuum pump 15 from stopping running when the negative pressure is too large.

[0021] Before use, all pipe fittings in the device are tested for leaks at a pressure of 1.0Mpa to avoid pipeline leakage during production. Metal spiral wound gaskets are used at the flange connections of the pipelines, and the pipelines are tested for vacuum tightness. During the test, the value of the pressure transmitter 14 is used as a reference to ensure that the instrument display is accurate. All valves are high-performance, high-temperature resistant sealed butterfly valves. Then set the pressure of the pressure transmitter 14 to -0.1 Mpa, debug through analog value signals, ensure that each point is displayed accurately, the adjustment control accuracy meets the standards, and the interlocking settings meet the logical requirements. Then close the valves on the wastewater discharge pipeline 10 at the bottom of the alkali sealing tank 8 and the water sealing tank 9, add liquid alkali and primary industrial water to the alkali sealing tank 8 and the water sealing tank 9 through the alkali replenishment pipeline 11 and the water replenishment pipeline 12, respectively, and control the liquid volume to 65% of the total volume of the tank body before closing the valves of the alkali replenishment pipeline 11 and the water replenishment pipeline 12.

[0022] When in use, first open all valves on the gas phase pipeline 2 and the venting pipeline 16 in sequence, open the valve of the coarse particle outlet pipe 5 of the drum screen 4 and place a coarse particle collection facility at the pipeline outlet. Then close the vacuum pump inlet regulating valve 13 on the vacuum pump 15 and the valve on the fine material outlet pipe 7 at the bottom of the catalyst storage hopper 6. Start the drum screen 4 on site, observe that the operating current is stable and normal, put the vacuum pump 15 into automatic mode and start running, observe that the negative pressure at the vacuum pump inlet is stable and displayed at -0.1Mpa, then insert the extraction pipe 1 into the catalyst to be extracted to carry out extraction and screening operations.

[0023] The working principle of the device is as follows: insert the inlet of the extraction pipe 1 into the catalyst equipment to be extracted, use the extraction pipe 1 to extract the solid particle catalyst into the cyclone separator 3 for gravity separation, the dust and other light impurities carried by the catalyst are first absorbed by the gas phase pipeline 2 set in the device through the alkali seal tank 8 and the water seal tank 9, and the remaining gas impurities after absorption are discharged through the venting pipe 16 connected to the outlet of the vacuum pump 15; wherein, the waste water in the alkali seal tank 8 and the water seal tank 9 needs to be discharged and replaced regularly to ensure that the dust carried by the catalyst will not pollute the environment, and the toxic and harmful substances of the catalyst will not damage the health of the staff after being absorbed. During screening, the catalyst separated by gravity in the cyclone separator 3 passes through the drum screen 4, and the reusable catalyst falls on the sieve plate 17 and enters the catalyst storage hopper 6 and is bagged through the fine material outlet pipe 7, while the agglomerated large block catalyst remains on the sieve plate 17 and enters the coarse particle outlet pipe 5 for collection, thereby completing the extraction and screening of the solid catalyst.

Claims

1. A catalyst extraction and screening device, characterized in that: The invention comprises an extraction pipe (1), wherein the inlet of the extraction pipe (1) is connected to the catalyst equipment to be extracted, the outlet of the extraction pipe (1) is connected to the inlet of the cyclone separator (3), and the outlet of the cyclone separator (3) is connected to the alkali sealing tank (8), the water sealing tank (9), the vacuum pump (15) and the venting pipe (16) in sequence; the top of the alkali sealing tank (8) is connected to the alkali replenishing pipe (11), the top of the water sealing tank (9) is connected to the water replenishing pipe (12), and the bottoms of the alkali sealing tank (8) and the water sealing tank (9) are both connected to the wastewater discharge pipe (10); The bottom of the cyclone separator (3) is connected to a drum screen (4), an inclined sieve plate (17) is provided inside the drum screen (4), the side of the drum screen (4) above the high position of the sieve plate (17) is connected to a coarse particle outlet pipe (5), and the bottom of the drum screen (4) is connected to a catalyst storage hopper (6) and a fine material outlet pipe (7) in sequence; A vacuum pump inlet regulating valve (13) and a pressure transmitter (14) are provided in sequence on the inlet pipeline of the vacuum pump (15); the pressure transmitter (14) is electrically connected to a signal input end of a PLC programmable controller, and a signal output end of the PLC programmable controller is electrically connected to the vacuum pump inlet regulating valve (13) and the vacuum pump (15), respectively.

2. A catalyst extraction and screening device as claimed in claim 1, characterized in that: The liquid content of the alkali sealing tank (8) and the water sealing tank (9) is 65-85% of the total volume of the tank body.

3. A catalyst extraction and screening device as claimed in claim 2, characterized in that: The pressure of the pressure transmitter (14) is -0.6 to -0.1 MPa.

4. A catalyst extraction and screening device as claimed in claim 3, characterized in that: The sieve plate (17) is detachable.

5. A catalyst extraction and screening device as claimed in claim 4, characterized in that: The inclination angle of the sieve plate (17) is 30 to 45 degrees.

6. A catalyst extraction and screening device according to any one of claims 1 to 5, characterized in that: The extraction pipe (1), the cyclone separator (3), the alkali sealing tank (8), the water sealing tank (9) and the vacuum pump (15) are all connected via a gas phase pipeline (2).

7. A catalyst extraction and screening device according to any one of claims 1 to 5, characterized in that: The extraction pipe (1) is a hose.

8. A catalyst extraction and screening device according to any one of claims 1 to 5, characterized in that: The drum screen (4) is driven by a three-phase asynchronous motor.

9. A catalyst extraction and screening device as claimed in claim 8, characterized in that: Valves are provided on the inlet and outlet of the alkali sealing tank (8), the inlet and outlet of the water sealing tank (9), the wastewater discharge pipeline (10), the alkali replenishment pipeline (11) and the water replenishment pipeline (12).

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