Catalyst extracting and screening device

Abstract

The utility model 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 utility model relates to the field of catalyst screening equipment, in particular to a catalyst extraction and screening device. Background Art

[0002] A catalyst, also known as a catalytic agent, is a substance that changes the reaction rate but does not change the total standard Gibbs free energy of the reaction. In a chemical reaction, it can change (speed up or slow down) the chemical reaction rate of other substances, while its own mass 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 chemically react with the active components of the catalyst or undergo ion exchange, causing changes in the active components, such as acidic catalysts being neutralized by alkali, sulfides or nitrides causing poisoning of precious metal catalysts, etc. Catalyst poisoning deactivation is often manifested as a rapid decrease in activity. Active components may be lost due to wear or sublimation during use, which can also lead to permanent deactivation. This type of deactivation is often difficult to recover simply. (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, preventing the reactants from contacting 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) Incorrect operation leads to catalyst deactivation, 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 usually needs to be replaced in time. The current method of replacing the catalyst is to manually open the equipment and overturn it. The following problems are prone to occur during the overturning process: (1) The dust mixed in the manual overturning process 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 the workers; (2) Manual overturning is inefficient, time-consuming and labor-intensive, which will extend the catalyst replacement time and lead to high-load production of the chemical system; (3) Manual overturning causes greater mechanical damage to the catalyst, resulting in serious waste of catalyst and increased chemical production costs. Utility Model Content

[0005] The utility model provides a catalyst extraction and screening device, which aims to solve the problems of time-consuming and labor-intensive manual overturning and replacement of catalysts, resulting in high-load production in the chemical system, and serious damage to the catalyst caused by overturning, and toxic and harmful substances affecting the environment and the health of operators.

[0006] To achieve its purpose, the utility model adopts the following technical solutions:

[0007] A catalyst extraction and screening device comprises an extraction pipe, the extraction pipe inlet of which is connected to a catalyst device to be extracted, the extraction pipe outlet of which is connected to a cyclone separator inlet, and the cyclone separator outlet of which is connected in sequence to an alkali seal tank, a water seal tank, a vacuum pump, and a vent pipe; the top of the alkali seal tank is connected to an alkali supply pipe, the top of the water seal tank is connected to a water supply pipe, and the bottoms of both the alkali seal tank and the water seal tank are connected to a wastewater discharge pipe;

[0008] The bottom of the cyclone separator is connected to a drum screen, which is equipped with an inclined sieve plate. 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.

[0009] A vacuum pump inlet regulating valve and a pressure transmitter are sequentially provided on the inlet pipe of the vacuum pump; 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.

[0010] 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.

[0011] Furthermore, the pressure of the pressure transmitter is -0.6 to -0.1 MPa.

[0012] Furthermore, the screen plate is detachable.

[0013] Furthermore, the inclination angle of the sieve plate is 30 to 45 degrees.

[0014] 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.

[0015] Furthermore, the extraction pipe is a hose.

[0016] Furthermore, the drum screen is driven by a three-phase asynchronous motor.

[0017] 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 supply pipeline and the water supply pipeline.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Utilize the extraction and screening device provided by the utility model, the extracted catalyst is first sent to the cyclone separator and then separated by gravity into the drum screen for screening. After screening, the reusable catalyst enters the catalyst storage hopper and flows to the fine material outlet pipe for collection, while the non-reusable agglomerated catalyst is screened to the coarse particle outlet pipe for storage and processing, and the screening process saves time and effort. Moreover, the light impurities such as dust carried by the catalyst are first absorbed by the alkali sealing tank and the water sealing tank through the gas phase pipeline provided in the device. After absorption, the remaining gas impurities are discharged through the vent pipe 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 in 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.

[0020] 2. The catalyst extraction and screening device provided by this utility model uses a flexible hose as the extraction pipe connected to the cyclone separator inlet, ensuring flexible connection to different equipment for extracting catalysts. It has a wide range of applications and strong practicality. The sieve plate is removable and easy to replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the extraction and screening device of the present utility model;

[0022] 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 pipe; 11-alkali supply pipe; 12-water supply pipe; 13-vacuum pump inlet regulating valve; 14-pressure transmitter; 15-vacuum pump; 16-vent pipe; 17-sieve plate. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings:

[0024] like Figure 1 As shown, the utility model is a catalyst extraction and screening device, including an extraction pipe 1, which is a flexible pipe. The inlet of the extraction pipe 1 is connected to the catalyst equipment to be extracted, and the outlet of the extraction pipe 1 is connected to the inlet of the cyclone separator 3 through a gas phase pipe 2. 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 vent pipe 16 in sequence through the gas phase pipe 2; the top of the alkali sealing tank 8 is connected to the alkali replenishment pipe 11, and the top of the water sealing tank 9 is connected to the water replenishment pipe 12. The bottoms of the alkali sealing tanks 8 and 9 are both connected to the wastewater discharge pipe 10. 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 pipe 10, the alkali replenishment pipe 11, and the water replenishment pipe 12.

[0025] 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 an on-site switch operating column. A removable sieve plate 17 with a 45° tilt and a 2mm aperture is installed within the drum screen 4. The side of the drum screen 4 above the upper 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 particle outlet pipe 7 in sequence. The catalyst to be screened is drawn from the upper part of the drum screen 4 and screened toward the lower part. Reusable catalyst is screened into the catalyst storage hopper 6 and flows into the fine particle outlet pipe 7 for collection. Non-reusable agglomerated catalyst is intercepted on the sieve plate 17 and flows into the coarse particle outlet pipe for collection and processing.

[0026] 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 terminal of the PLC programmable controller, and the signal output terminal 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, it transmits a signal to the PLC programmable controller. The PLC programmable controller receives the signal and controls 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, it transmits a signal to the PLC programmable controller. The PLC programmable controller receives the signal and controls the vacuum pump inlet regulating valve 13 to close, and the vacuum pump 15 stops operating for maintenance. In this way, signal interlocking is achieved, remote operation is performed, and the vacuum pump 15 is automatically protected from operating when the negative pressure is too high.

[0027] Before use, all pipes and fittings in the device are pressure-tested at 1.0 MPa to prevent leakage during production. Metal spiral-wound gaskets are used at all pipe flange connections, and the pipes are vacuum-tested for airtightness. During the test, the value of pressure transmitter 14 is used as a reference to ensure accurate instrument display. All valves are high-performance, high-temperature-resistant, sealed butterfly valves. The pressure of pressure transmitter 14 is then set to -0.1 MPa. The device is debugged using analog signals to ensure accurate display at each point, accurate adjustment and control accuracy, and that interlock settings meet logical requirements. The valves on the wastewater discharge pipe 10 at the bottom of the alkali sealing tank 8 and water sealing tank 9 are then closed. Liquid caustic soda and primary industrial water are added to the alkali sealing tank 8 and water sealing tank 9 through the alkali feed pipe 11 and water feed pipe 12, respectively. The liquid volume is controlled to 65% of the total tank volume before the valves on the alkali feed pipe 11 and water feed pipe 12 are closed.

[0028] During operation, first open all valves on the gas phase pipeline 2 and the vent pipeline 16 in sequence. Open the valve on the coarse particle outlet pipe 5 of the drum screen 4 and place a coarse particle collection device 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 and observe that the operating current is stable and normal. Put the vacuum pump 15 into automatic mode and start running. When the negative pressure at the vacuum pump inlet stabilizes at -0.1 MPa, insert the extraction pipe 1 into the catalyst to be extracted and begin extraction and screening.

[0029] The working principle of this device is as follows: the inlet of the extraction pipe 1 is inserted into the catalyst equipment to be extracted, and the solid particle catalyst is extracted into the cyclone separator 3 by the extraction pipe 1 for gravity separation. The dust and other light impurities carried by the catalyst are first absorbed by the gas phase pipe 2 set in the device through the alkali seal tank 8 and the water seal tank 9. After absorption, the remaining gas impurities are discharged through the vent pipe 16 connected to the outlet of the vacuum pump 15; wherein, the wastewater 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 does not pollute the environment, and the toxic and harmful substances of the catalyst will not harm 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 in the drum screen (4), 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; A vacuum pump inlet regulating valve (13) and a pressure transmitter (14) are sequentially provided on the inlet pipe of the vacuum pump (15); 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.

2. A catalyst extraction and screening device according to claim 1, characterized in that: The liquid filling amount 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 according to 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 according to claim 3, characterized in that: The sieve plate (17) is detachable.

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

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 according to 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 pipe (10), the alkali supply pipe (11) and the water supply pipe (12).

Images