Solid catalyst low temperature drying equipment

Abstract

The invention discloses a low-temperature drying device for a solid catalyst, which relates to the field of catalyst drying and comprises a box body and a negative pressure pump. The interior of the box body is divided into a plurality of drying chambers by a plurality of partitions. The negative pressure pump is used for exhausting the gas in the drying chamber to form a negative pressure environment. A material tray for holding the catalyst is placed in the drying chamber. A lifting plate is slidably arranged in the drying chamber. An elastic sleeve is sealed and connected between the upper surface of the lifting plate and the upper partition or the top of the box body. A plurality of vertically downward electric heating tubes are evenly distributed on the surface of the lifting plate. The negative pressure pump exhausts air to form a negative pressure in the drying chamber. The negative pressure adsorbs the lifting plate to stretch the elastic sleeve downward, so that the electric heating tube is inserted into the catalyst in the material tray. The invention elastically arranges a lifting plate above each drying chamber. When vacuum drying the catalyst is performed, the negative pressure causes the lifting plate to autonomously descend, and the electric heating tube is inserted into the interior of the catalyst to form evenly distributed in-depth heating points, thereby increasing the heat transfer efficiency, and improving the drying uniformity and drying efficiency.

Description

Technical Field

[0001] The invention relates to the field of catalyst drying, in particular to low-temperature drying equipment for solid catalysts. Background Art

[0002] There are many ways to dry chemical solid catalysts. Solid catalysts such as supported catalysts, metal oxide catalysts, and molecular sieve catalysts are prone to structural changes and reduced activity under high temperature conditions. Drying of such catalysts cannot be achieved by high temperature, and vacuum drying can overcome the above problems.

[0003] The vacuum drying method can provide a reduced pressure environment, lower the boiling point of water, and make the water in the catalyst evaporate quickly at a lower temperature, which can reduce the temperature required for drying.

[0004] The drying environment of the vacuum drying method is in a negative pressure state, the number of gas molecules is reduced, and heat conduction mainly relies on heat conduction inside the material and heat transfer of a small amount of gas molecules. The heat transfer efficiency is low. The heat source position of traditional vacuum drying equipment is fixed, and the heat source can only contact the catalyst on the outside. The efficiency of heat transfer to the inside of the catalyst is low, resulting in uneven heat distribution inside and outside the catalyst. Not only is the drying efficiency low, but the drying uniformity effect is also poor. Summary of the invention

[0005] In order to make up for the deficiencies of the existing technical problems, the purpose of the present invention is to provide a low-temperature drying device for solid catalysts, which is used to solve the problems that the traditional vacuum drying equipment has a fixed heat source position, low heat conduction efficiency inside the catalyst, resulting in a large temperature difference between the inside and outside of the catalyst, low drying efficiency, and poor drying uniformity.

[0006] In order to solve the problems of the prior art, the technical solution of the present invention is as follows:

[0007] The low-temperature drying equipment for solid catalysts comprises a box body and a negative pressure pump. The interior of the box body is divided into multiple drying chambers by multiple partitions. The negative pressure pump is used to evacuate the gas in the drying chamber to form a negative pressure environment. A material tray for holding the catalyst is placed in the drying chamber. A lifting plate is slidably arranged in the drying chamber. An elastic sleeve is sealed and connected between the upper surface of the lifting plate and the upper partition or the top of the box body. A number of vertically downward electric heating tubes are evenly distributed on the surface of the lifting plate. The negative pressure pump evacuates air to form a negative pressure in the drying chamber. The negative pressure absorbs the lifting plate to stretch the elastic sleeve downward, so that the electric heating tube is inserted into the catalyst in the material tray, forming a number of heating points deep inside the catalyst.

[0008] Preferably, a plurality of openings are evenly arranged on the surface of the lifting plate, and two fixed electrode sheets are symmetrically distributed on the edges of the openings, and the two electrode sheets are respectively connected to the positive and negative circuits through the conductor plates.

[0009] Preferably, the electric heating tube includes a tube body, the outer periphery of the tube body has an expansion plate, two moving electrode sheets are symmetrically arranged on the upper surface of the expansion plate, and an electric heating wire is arranged inside the tube body, the electric heating wire is respectively connected to the two moving electrode sheets, and the top of the tube body is threadedly connected to the through-port until the moving electrode sheets are aligned and contacted with the fixed electrode sheets.

[0010] Preferably, a rubber ring is provided on the edge of the upper surface of the expansion plate, and the rubber ring is in compression contact with the surface of the lifting plate to seal the moving electrode sheet and the fixed electrode sheet.

[0011] Preferably, the bottom end of the electric heating tube is in a pointed cone or spherical shape.

[0012] Preferably, a layer cavity is formed between the lifting plate, the elastic sleeve and the upper partition or the top of the box, the tube body has a cavity penetrating the layer cavity, a plurality of air holes penetrating the internal cavity are evenly distributed on the surface of the tube body, and the layer cavity is connected to a nitrogen source through a pressure valve.

[0013] Preferably, the pressure valve includes a valve tube, the top of the valve tube is connected to the nitrogen source through an air inlet, the bottom of the valve tube is connected to the layer cavity through an air outlet, the middle of the valve tube has a reduced diameter portion, the reduced diameter portion is adapted to slide with a core tube, the core tube has a chamber that passes through the top surface, the side of the core tube has a side port that passes through its chamber, the bottom of the core tube is supported by a spring to move upward to block the reduced diameter portion, and when the core tube is adsorbed by negative pressure and descends to the side port over the reduced diameter portion, the nitrogen is conducted downward through the side port.

[0014] Preferably, a support is threadedly connected to the bottom of the valve tube, and the spring at the bottom of the core tube is in contact with the support.

[0015] Preferably, a push switch is provided on the side of the valve tube, the push switch is connected to the circuit of the heating wire, and a touch plate is installed on the inner wall of the valve tube through the elastic rotation of a torsion spring. The top edge of the core tube has a block, and the block descends to squeeze the touch plate to rotate, so that the touch plate squeezes the push switch to turn on the circuit of the heating wire.

[0016] Preferably, the material tray is a square container with an open top, and the side walls of the material tray are ventilated mesh plates.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] 1. The present invention elastically sets a lifting plate above each drying chamber. When the catalyst is vacuum dried, the negative pressure causes the lifting plate to descend autonomously, inserting the electric heating tube into the catalyst to form evenly distributed deep heating points, increase heat transfer efficiency, and improve drying uniformity and drying efficiency.

[0019] 2. The present invention connects the nitrogen source through a pressure valve. When the negative pressure in the drying chamber reaches a set level, the pressure valve is turned on. Nitrogen is introduced into the catalyst through various electric heating tubes. The drying chamber maintains a stable negative pressure state while stably conducting nitrogen, which can not only expand the efficiency of heat diffusion, but also nitrogen can take away the moisture generated by heating, thereby improving heating uniformity and drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention in normal pressure state.

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention under normal pressure.

[0022] Figure 3 It is a schematic diagram of the negative pressure state structure of the present invention.

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the negative pressure state of the present invention.

[0024] Figure 5 It is a schematic diagram of the external structure of the electric heating tube of the present invention.

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the electric heating tube of the present invention.

[0026] Figure 7 It is a schematic diagram of the connection structure between the electric heating tube and the lifting plate of the present invention.

[0027] Figure 8 It is a schematic diagram of the distributed connection structure of the fixed electrode sheet and the conductor plate of the present invention.

[0028] Fig. 9 It is a schematic diagram of the pressure valve blocking structure of the present invention.

[0029] Fig.10 It is a schematic diagram of the negative pressure conduction structure of the pressure valve of the present invention.

[0030] Figure numerals: 1. Box body; 11. Material tray; 12. Air inlet pipe; 13. Air outlet pipe; 2. Partition; 21. Layer cavity; 3. Lifting plate; 31. Through port; 32. Fixed electrode sheet; 33. Conductor plate; 4. Electric heating tube; 41. Tube body; 42. Air hole; 43. Expansion plate; 44. Rubber ring; 45. Moving electrode sheet; 46. Heating wire; 5. Elastic sleeve; 6. Pressure valve; 61. Valve tube; 62. Air inlet; 63. Air outlet; 64. Reduced diameter part; 65. Core tube; 66. Side port; 67. Block; 68. Push switch; 69. Touch panel; 610. Support; 7. Negative pressure pump. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] like Figure 1 , Figure 3 As shown, the solid catalyst low-temperature drying equipment comprises a box body 1, the box opening of the box body 1 is located on the side, and a box door is provided for closing and sealing the box opening, a plurality of partitions 2 are vertically arranged and fixed inside the box body 1, and the partitions 2 divide the inside of the box body 1 into a plurality of drying chambers, and a material tray 11 is placed in each drying chamber, and the material tray 11 is a square container with an open top, and the side wall of the material tray 11 is a ventilated mesh plate, and the catalyst particles to be treated are placed on the material tray 11, and the box door is opened to insert the material tray 11 into each drying chamber through the box opening;

[0033] like Figure 2 , Figure 4 As shown, an air outlet pipe 13 is arranged on the left side of the box body 1, and the side openings of each drying chamber are connected to the air outlet pipe 13. The negative pressure pump 7 is installed on the outside of the box body 1, and the air inlet end of the negative pressure pump 7 is connected to the air outlet pipe 13 through a pipeline. The negative pressure pump 7 is used to pump air to form a negative pressure in each drying chamber.

[0034] Low temperature drying equipment has two improved functions: uniform heating and uniform steam evacuation.

[0035] The uniform heating function structure is as follows:

[0036] like Figure 2 , Figure 4 As shown, a lifting plate 3 is arranged in each drying chamber, and the edge of the lifting plate 3 slides with the inner wall of the box body 1, so that the lifting plate 3 can only move vertically, and an elastic sleeve 5 is fixed on the upper surface of the lifting plate 3, and the top of the elastic sleeve 5 is connected to the bottom surface of the upper partition 2, and the uppermost elastic sleeve 5 is connected to the inner top surface of the box body 1, and a plurality of electric heating tubes 4 are evenly installed on the surface of the lifting plate 3, and the electric heating tubes 4 extend vertically downward;

[0037] Under normal conditions, the elastic sleeve 5 exerts an upward elastic force on the lifting plate 3 to keep the lifting plate 3 at a high position, which facilitates the insertion of the material tray 11 into each drying chamber. After the chamber door is closed and sealed, the negative pressure pump 7 is turned on to suck the gas in each drying chamber, so that the negative pressure in the drying chamber gradually increases. The negative pressure adsorbs the lifting plate 3 to stretch the elastic sleeve 5 downward, so that the electric heating tube 4 is evenly inserted into the catalyst in the material tray 11. Several evenly distributed electric heating tubes 4 penetrate into the interior of the catalyst to form evenly distributed heating points. The catalyst is evenly heated by the electric heating tube 4 to evaporate the moisture in the catalyst, with high drying efficiency and good drying uniformity.

[0038] After drying is completed, the valve ports are opened to ventilate each drying chamber to restore the pressure to normal. The elastic force of the elastic sleeve 5 causes the lifting plate 3 to rise, and the electric heating tube 4 is pulled out from the catalyst, making it convenient to take out the material tray 11.

[0039] The circuit structure of the electric heating tube 4 is as follows:

[0040] like Figure 7 , Figure 8 As shown, a plurality of openings 31 are evenly formed on the surface of the lifting plate 3, and two fixed electrode sheets 32 are symmetrically distributed at the edges of the openings 31. A conductor plate 33 connected to a negative circuit and a conductor plate 33 connected to a positive circuit are arranged inside the lifting plate 3. The two fixed electrode sheets 32 at the edges of the openings 31 are connected to the positive and negative circuits respectively through the conductor plates 33.

[0041] like Figure 5 , Figure 6 As shown, the electric heating tube 4 includes a cylindrical tube body 41, which is made of aluminum nitride ceramics. An expansion plate 43 is fixed on the periphery of the tube body 41, and two moving electrode sheets 45 are symmetrically installed on the upper surface of the expansion plate 43. A heating wire 46 is arranged inside the tube body 41, and the two ends of the heating wire 46 are respectively connected to the two moving electrode sheets 45. The top of the tube body 41 has a threaded portion, and the tube body 41 is threadedly connected to the through port 31 until the expansion plate 43 contacts the surface of the lifting plate 3. At this time, the moving electrode sheet 45 is aligned and contacted with the fixed electrode sheet 32 ​​to complete the circuit conduction.

[0042] The bottom end of the electric heating tube 4 is in a pointed cone or spherical shape, which is convenient for the electric heating tube 4 to be inserted downward into the granular catalyst. A rubber ring 44 is set on the edge of the upper surface of the expansion plate 43. When the tube body 41 and the through hole 31 are screwed together, the rubber ring 44 is squeezed and contacted with the surface of the lifting plate 3 to seal the moving electrode sheet 45 and the fixed electrode sheet 32, so as to keep the moving electrode sheet 45 and the fixed electrode sheet 32 ​​stably conducting electricity.

[0043] The uniform evacuation of steam functions as follows:

[0044] like Figure 2 , Figure 4 , Figure 6 As shown, a layer cavity 21 is formed between the lifting plate 3, the elastic sleeve 5 and the upper partition plate 2 or the top of the box body 1, the inner cavity of the tube body 41 extends to its top surface and passes through the layer cavity 21, a plurality of air holes 42 are evenly distributed on the surface of the tube body 41, and the air holes 42 pass through the chamber of the tube body 41, and an air inlet manifold 12 is arranged on the right side of the box body 1, and the side of each layer cavity 21 has an opening that passes through the air inlet manifold 12, and the air inlet manifold 12 is connected to a pressure valve 6;

[0045] like Fig. 9 , Fig.10As shown, the pressure valve 6 includes a valve tube 61, the top of the valve tube 61 is provided with an air inlet 62, the air inlet 62 is connected to an external nitrogen source, the bottom of the valve tube 61 is provided with an air outlet 63, the air outlet 63 is communicated with the air inlet manifold 12, the middle of the valve tube 61 is provided with a reduced diameter portion 64, a core tube 65 is adapted to slide through the reduced diameter portion 64, the chamber inside the core tube 65 passes through the top thereof, a side port 66 is provided on the side of the core tube 65, the side port 66 is communicated with the chamber of the core tube 65, and a spring is arranged between the bottom of the core tube 65 and the valve tube 61;

[0046] In the initial state, the core tube 65 moves upward under the action of elastic force, so that the side port 66 is located above the reduced diameter portion 64, the core tube 65 blocks the reduced diameter portion 64, and the nitrogen path is in a cut-off state. When the vacuum drying operation is performed, as the pressure in the drying chamber continues to decrease, the negative pressure strength at the lower part of the valve tube 61 gradually increases, and the core tube 65 gradually overcomes the elastic force under the action of negative pressure. When the negative pressure reaches a certain level, the core tube 65 drops to the side port 66 and crosses the reduced diameter portion 64. The nitrogen is conducted downward through the side port 66 and distributed to each layer cavity 21 through the air inlet manifold 12. The nitrogen enters each tube body 41 and is heated, and is evenly sprayed into the catalyst through the air holes 42. The nitrogen gradually diffuses from the inside of the catalyst to the outside and is then sucked out by the negative pressure pump 7. In this process, the nitrogen can not only expand the efficiency of heat diffusion, but also take away the moisture generated by heating, thereby improving the heating uniformity and drying efficiency.

[0047] The side port 66 is vertically extended and has a uniform width. When the negative pressure intensity generated by the suction layer cavity 21 of the negative pressure pump 7 is greater, the core tube 65 descends more, the area of ​​the side port 66 crossing the reduced diameter portion 64 is larger, the nitrogen conduction is greater, the steam evacuation efficiency and heat diffusion efficiency are higher, and the drying efficiency can be controlled by controlling the suction intensity of the negative pressure pump 7.

[0048] The timing of nitrogen conduction is when the drying chamber maintains a certain negative pressure strength, and the negative pressure adsorption core tube 65 drops to a sufficient distance, so that the side port 66 passes over the reduced diameter portion 64 to conduct nitrogen. The negative pressure strength in this state is constant, and the negative pressure strength required for drying different catalysts is different. Therefore, it is necessary to adjust the negative pressure strength of nitrogen in a stable state according to the specific catalyst characteristics. The operation is as follows:

[0049] like Fig. 9 , Fig.10As shown, a support 610 is set on the valve tube 61, and the support 610 has a plate body and a screw rod. The screw rod thread runs through the bottom of the valve tube 61, and the plate body is used to support the spring at the bottom of the core tube 65. The position of the plate body supporting the spring is adjusted by rotating the screw rod to adjust the initial pressure applied by the spring to the core tube 65. The higher the support 610 as a whole is, the greater the initial pressure of the spring on the core tube 65 is, and the greater the negative pressure intensity required to make the core tube 65 descend to the side port 66 and pass through the reduced diameter portion 64, that is, the greater the steady-state negative pressure intensity of the drying chamber. Therefore, the negative pressure intensity of the drying chamber in the steady state can be conveniently adjusted according to different catalysts.

[0050] like Fig. 9 , Fig.10 As shown, a push switch 68 is sealed and installed at a position higher than the reduced diameter portion 64 on the side of the valve tube 61. The push switch 68 is connected to the circuit of the heating wire 46. A touch plate 69 is rotatably installed at a position corresponding to the push switch 68 on the inner wall of the valve tube 61. The touch plate 69 is in a downward swing state, and a torsion spring is arranged at the rotating part of the touch plate 69. The torsion spring makes the touch plate 69 tilt up and not contact the push switch 68. The top edge of the core tube 65 has a stopper 67.

[0051] When the negative pressure pump 7 sucks air to generate negative pressure in the drying chamber, the negative pressure adsorption core tube 65 descends, causing the block 67 to descend and squeeze the touch plate 69 to rotate. The touch plate 69 squeezes the press switch 68 to turn on the circuit of the heating wire 46, ensuring that the heating wire 46 only works under negative pressure, thereby improving the working safety of the equipment and the autonomous coordination effect of the work.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-temperature drying device for a solid catalyst, comprising a housing (1) and a negative pressure pump (7), wherein the interior of the housing (1) is divided into a plurality of drying chambers by a plurality of partitions (2), the negative pressure pump (7) is used to evacuate the gas in the drying chamber to form a negative pressure environment, and a material tray (11) for holding the catalyst is placed in the drying chamber, characterized in that: A lifting plate (3) is slidably arranged in the drying chamber, an elastic sleeve (5) is sealed between the upper surface of the lifting plate (3) and the upper partition plate (2) or the top of the box body (1), and a plurality of electric heating tubes (4) are evenly distributed on the surface of the lifting plate (3) and are vertically downwardly directed. A negative pressure pump (7) draws air to form a negative pressure in the drying chamber, and the negative pressure adsorbs the lifting plate (3) to stretch the elastic sleeve (5) downward, so that the electric heating tube (4) is inserted into the catalyst in the material tray (11), thereby forming a plurality of heating points that penetrate deep into the catalyst.

2. The solid catalyst low temperature drying equipment according to claim 1, characterized in that: The surface of the lifting plate (3) is evenly provided with a plurality of openings (31), and two fixed electrode sheets (32) are symmetrically distributed on the edges of the openings (31). The two electrode sheets are respectively connected to the positive and negative circuits through the conductor plates (33).

3. The solid catalyst low temperature drying equipment according to claim 2, characterized in that: The electric heating tube (4) comprises a tube body (41), the outer periphery of the tube body (41) is provided with an expansion plate (43), two moving electrode sheets (45) are symmetrically arranged on the upper surface of the expansion plate (43), an electric heating wire (46) is arranged inside the tube body (41), the electric heating wire (46) is respectively connected to the two moving electrode sheets (45), and the top of the tube body (41) is threadedly connected to the through opening (31) until the moving electrode sheets (45) are aligned and contacted with the fixed electrode sheets (32).

4. The solid catalyst low temperature drying equipment according to claim 3, characterized in that: A rubber ring (44) is provided on the edge of the upper surface of the diameter expansion plate (43), and the rubber ring (44) is in compression contact with the surface of the lifting plate (3) to seal the moving electrode sheet (45) and the fixed electrode sheet (32).

5. The solid catalyst low temperature drying equipment according to claim 3, characterized in that: The bottom end of the electric heating tube (4) is in a pointed cone shape or a spherical shape.

6. The solid catalyst low temperature drying equipment according to claim 3, characterized in that: A layer cavity (21) is formed between the lifting plate (3), the elastic sleeve (5) and the upper partition plate (2) or the top of the box body (1); the tube body (41) has a chamber penetrating the layer cavity (21); a plurality of air holes (42) penetrating the internal cavity are evenly distributed on the surface of the tube body (41); and the layer cavity (21) is connected to a nitrogen source via a pressure valve (6).

7. The solid catalyst low temperature drying equipment according to claim 6, characterized in that: The pressure valve (6) comprises a valve tube (61), the top of the valve tube (61) is connected to a nitrogen source via an air inlet (62), the bottom of the valve tube (61) is connected to the layer cavity (21) via an air outlet (63), the middle of the valve tube (61) is provided with a reduced diameter portion (64), the reduced diameter portion (64) is adapted to be slidably provided with a core tube (65), the core tube (65) has a chamber penetrating the top surface, the side of the core tube (65) has a side opening (66) penetrating the chamber, the bottom of the core tube (65) is supported by a spring to move upward to block the reduced diameter portion (64), when the core tube (65) is adsorbed by negative pressure and descends to the side opening (66) and passes over the reduced diameter portion (64), the nitrogen is conducted downward through the side opening (66).

8. The solid catalyst low temperature drying equipment according to claim 7, characterized in that: The bottom of the valve tube (61) is threadedly connected to a support (610), and the spring at the bottom of the core tube (65) is in contact with the support (610).

9. The solid catalyst low temperature drying equipment according to claim 7, characterized in that: A push switch (68) is provided on the side of the valve tube (61), and the push switch (68) is connected to the circuit of the heating wire (46). A touch plate (69) is installed on the inner wall of the valve tube (61) through the elastic rotation of a torsion spring. The top edge of the core tube (65) has a stopper (67), and the stopper (67) descends to squeeze the touch plate (69) to rotate, so that the touch plate (69) squeezes the push switch (68) to conduct the circuit of the heating wire (46).

10. The solid catalyst low temperature drying equipment according to claim 1, characterized in that: The material tray (11) is a square container with an open top, and the side wall of the material tray (11) is a ventilated mesh plate.

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