A drying device for preparing high-porous honeycomb catalyst

Abstract

The present invention discloses a drying device for preparing high-porous honeycomb catalysts, which belongs to the technical field of catalyst production, and solves the problems of low drying efficiency, uneven drying, and poor drying effect in the prior art. The drying device comprises a drying chamber, wherein a support plate and a porous partition are provided in the drying chamber, and an air duct for inputting dry hot air into the drying chamber is provided on the support plate. An air chamber is formed between the support plate and the partition, and the dry hot air first enters the air chamber and then passes upward through the partition, and a movable block driven by a screw motor is also provided between the partition and the top of the drying chamber. The present invention realizes the drying effect on the catalyst by the dry hot air moving from bottom to top, thereby increasing the contact area between the dry hot air and the catalyst, and improving the drying efficiency. The movable block is driven by the screw motor to perform linear reciprocating motion, so that each catalyst is in a state of intermittently moving away from or close to the air outlet end of the air duct, thereby realizing uniform drying of a plurality of catalysts and further improving the drying effect.

Description

Technical Field

[0001] The invention belongs to the technical field of catalyst production, and in particular relates to a drying device for preparing a high-porous honeycomb catalyst. Background Art

[0002] Nitrogen oxides (NO x , including NO, NO2 and other compounds) is one of the main pollutants causing air pollution. Coal-fired power plants are NO x The primary emission source. Selective catalytic reduction denitrification technology (SCR) is currently the most widely used, most efficient and most mature denitrification technology, and its technical focus is denitrification catalysts. At present, the catalysts used for SCR denitrification at home and abroad are mainly honeycomb, flat and corrugated. Compared with other forms of catalysts, honeycomb catalysts have the characteristics of high porosity, low pressure drop, large specific surface area, high activity and long life, and the market share accounts for more than 60%. In the prior art, the honeycomb catalyst is extruded by an extruder through a mold, and then dried and calcined. The drying device used in the drying process has a single structure and cannot guarantee the uniformity of drying the honeycomb catalyst. Although the drying effect is improved to a certain extent by increasing the drying air flow or temperature, it has an adverse effect on the structure or rigidity of the honeycomb catalyst, and the catalytic performance of the honeycomb catalyst after preparation cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to provide a drying device for preparing a high-porous honeycomb catalyst with high drying efficiency, uniform drying and good drying effect in view of the deficiencies in the prior art.

[0004] In order to achieve the above technical purpose, the technical solution adopted by the drying device for preparing high-porous honeycomb catalyst of the present invention is:

[0005] A drying device for preparing a high-porous honeycomb catalyst comprises a drying chamber for placing the catalyst, wherein a support plate and a porous partition are provided in the drying chamber, the catalyst is placed between the partition and the top of the drying chamber, the support plate is located below the partition, an air duct for inputting dry hot air into the drying chamber is provided on the support plate, an air chamber is formed between the support plate and the partition, the dry hot air first enters the air chamber and then passes upward through the partition, a movable block driven by a screw motor is also provided between the partition and the top of the drying chamber, the screw motor comprises a motor body, a screw and a limit rod, the movable block is in the drying chamber The movable block reciprocates in the vertical direction to form a disturbance to the catalyst. The movable block is connected to the screw by a threaded connection, and the limit rod is slidably connected to the movable block. The movable block is spherical and hollow. A self-locking air nozzle is provided at the top and bottom of the movable block. A plurality of columnar air bags connected to the inside of the movable block are provided on the outer wall of the movable block. An air inlet pipe connected to an air source is provided on the partition, and an air outlet pipe connected to the outside is provided on the top of the drying chamber. The air inlet pipe, the air outlet pipe and the air nozzle are all on the same axis. When the air outlet pipe or the air inlet pipe is inserted into the air nozzle, the air nozzle is in an open state.

[0006] Preferably, the air nozzle includes a convex-shaped shell, the upper inner diameter of the shell is smaller than the lower inner diameter of the shell, a sealing block and a plurality of limit blocks are provided on the inner side of the upper part of the shell, the plurality of limit blocks are spaced along the inner wall of the upper part of the shell and arranged in the same plane, a fixing rod is provided on the inner side of the lower part of the shell, a sliding rod extending along the axis of the shell is provided on the fixing rod, the sealing block is sleeved on the sliding rod and slides on the sliding rod, and a spring is provided between the bottom of the sealing block and the fixing rod.

[0007] Preferably, the portions of the air inlet pipe and the air outlet pipe that are in contact with the air nozzle are both hard, and the ends of the plurality of limit blocks form passages for the air inlet pipe and the air outlet pipe to enter and exit.

[0008] Preferably, the upper openings of a pair of shells are respectively and one-to-one correspondingly oriented toward the air inlet pipe and the air outlet pipe.

[0009] Preferably, the spring is sleeved on the slide rod, and when the spring is in a fully compressed state, the top of the sealing block is located below the lower opening of the shell.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention realizes the drying effect on the catalyst by the dry hot air moving from bottom to top, thereby increasing the contact area between the dry hot air and the catalyst and improving the drying efficiency;

[0012] 2. The present invention utilizes a screw motor to drive the movable block to perform linear reciprocating motion, which can achieve the change of the position of the catalyst in the drying chamber, so that each catalyst is in a state of intermittently moving away from or close to the air outlet end of the air duct, thereby achieving uniform drying of a plurality of catalysts;

[0013] 3. The present invention cooperates with the self-locking air nozzle, the air inlet pipe and the air outlet pipe so that when the movable block rises, the columnar airbag is in a stretched state, and when the movable block descends, the columnar airbag is in a collapsed state, which effectively improves the disturbance effect on the catalyst and further enhances the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram and operation state of the present invention Figure 1 ;

[0015] Figure 2 The operating state of the present invention Figure 2 ;

[0016] Figure 3 The operating state of the present invention Figure 3 ;

[0017] Figure 4 The operating state of the present invention Figure 4 ;

[0018] Figure 5 It is a structural schematic diagram of the movable block in the present invention;

[0019] Figure 6 It is a schematic diagram of the structure of the gas nozzle in the present invention;

[0020] Figure 7 It is a reference diagram of the action state of the air nozzle in the present invention.

[0021] In the figure: 1. Drying chamber; 11. Air duct; 12. Support plate; 13. Partition plate; 130. Air inlet pipe; 14. Air outlet pipe; 2. Movable block; 21. Air nozzle; 211. Shell; 212. Sealing block; 213. Fixed rod; 214. Sliding rod; 215. Spring; 216. Limit block; 22. Columnar airbag; 31. Motor body; 32. Screw rod; 33. Limit rod. DETAILED DESCRIPTION

[0022] The invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0023] like Figure 1-7As shown, a drying device for preparing a high-porous honeycomb catalyst comprises a drying chamber 1 for placing a catalyst, wherein a support plate 12 and a porous partition 13 are provided in the drying chamber 1, and the catalyst is placed between the partition 13 and the top of the drying chamber 1, and the support plate 12 is located below the partition 13, and an air duct 11 for inputting dry hot air into the drying chamber 1 is provided on the support plate 12, and a movable block 2 driven by a screw 32 motor is also provided between the partition 13 and the top of the drying chamber 1, and the movable block 2 reciprocates in the vertical direction in the drying chamber 1 to form a disturbance to the catalyst, and an air chamber is formed between the support plate 12 and the partition 13, and the dry hot air first enters the air chamber and then passes through the partition 13 upward. The dry hot air is input into the drying chamber 1 through the air duct 11, and the dry hot air moves upward in the drying chamber 1 to achieve the drying effect on the catalyst. At the same time, under the drive of the screw rod 32 motor, the movable block 2 is displaced, and the up and down movement of the movable block 2 will form a disturbance effect on the catalyst, thereby achieving the rolling of the catalyst in the drying chamber 1. In this way, the position of the catalyst in the drying chamber 1 can be changed, so that each catalyst will be in a state of intermittently moving away from or close to the air outlet end of the air duct 11, thereby achieving uniform drying of a number of catalysts, with a reasonable structure and good drying effect; the can-shaped drying chamber 1 occupies a small area, has low construction cost and maintenance cost, and reduces the cost of small and micro The economic burden of the enterprise; through the setting of the partition 13, the drying chamber 1 can be well separated to ensure that the catalyst will not fall under the partition 13. At the same time, an air storage space is formed between the partition 13 and the support plate 12. The dry hot air will first enter the air storage space and then pass through the partition 13 to perform the drying effect. In this way, the dry hot air can enter the top of the partition 13 more dispersedly, thereby improving the uniformity of drying. The screw 32 motor includes a motor body 31, a screw 32 and a limit rod 33. The movable block 2 is connected to the screw 32 by a thread, and the limit rod 33 is slidably connected to the movable block 2. The movable block 2 is spherical. In this way, the motor body 31 rotates to drive the movable block 2 to reliably reciprocate in a straight line direction; and the movable block 2 is spherical, which ensures that the disturbance to the catalyst can be formed, and the catalyst can be prevented from hindering the downward movement of the movable block 2. Since the catalyst does not contact the top wall of the drying chamber 1, the upward movement of the movable block 2 will not be hindered by the catalyst.

[0024] The movable block 2 is hollow, and a self-locking air nozzle 21 is provided at the top and bottom of the movable block 2. A plurality of columnar air bags 22 communicating with the interior of the movable block 2 are provided on the outer wall of the movable block 2.

[0025] The partition 13 is provided with an air inlet pipe 130 connected to the air source, and the top of the drying chamber 1 is provided with an air outlet pipe 14 connected to the outside. The air inlet pipe 130, the air outlet pipe 14 and the air nozzle 21 are all on the same axis. When the air outlet pipe 14 or the air inlet pipe 130 is inserted into the air nozzle 21, the air nozzle 21 is in an open state. When the screw rod 32 motor drives the movable block 2 to move downward, the air nozzle 21 near the air inlet pipe 130 opens (the air nozzle 21 near the air outlet pipe 14 is closed at this time), and the air source supplies air to the air inlet pipe 130. The gas enters the interior of the movable block 2 through the air nozzle 21 and fills the columnar air bag 22, so that the columnar air bag 22 stretches axially. In this way, in the process of the screw rod 32 motor driving the movable block 2 to move upward, the columnar air bag 22 can achieve auxiliary stirring of the catalyst, further ensuring that the catalyst can be reliably dried; and when the air nozzle 21 near the air outlet pipe 14 is connected to the air outlet pipe 14, the gas in the columnar air bag 22 is discharged from the air outlet pipe 14 under the pressure of the catalyst. In this way, the columnar air bag 22 shrinks, which can prevent the stretched columnar air bag 22 from being stuck by the catalyst during the downward movement of the movable block 2, causing the movable block 2 to be unable to move normally.

[0026] The air nozzle 21 includes a convex-shaped shell 211, the upper inner diameter of the shell 211 is smaller than the lower inner diameter of the shell 211, a sealing block 212 and a plurality of limit blocks 216 are provided on the inner side of the upper part of the shell 211, and the plurality of limit blocks 216 are arranged at intervals along the inner wall of the upper part of the shell 211 and in the same plane, a fixing rod 213 is provided on the inner side of the lower part of the shell 211, and a sliding rod 214 extending along the axis of the shell 211 is provided on the fixing rod 213, the sealing block 212 is sleeved on the sliding rod 214 and slides on the sliding rod 214, and a spring 215 is provided between the bottom of the sealing block 212 and the fixing rod 213. When the movable block 2 approaches the air inlet pipe 130, the air inlet pipe 130 will enter the upper part of the shell 211 and push the sealing block 212 to move toward the lower part of the shell 211. When the sealing block 212 moves to the lower part of the shell 211, a gap is generated between the sealing block 212 and the outer wall of the shell 211, and the gas in the air inlet pipe 130 can enter the movable block 2 and the columnar airbag 22 through the air nozzle 21; the opening and closing of the air nozzle 21 by the air outlet pipe 14 is similar. In this way, the opening and closing of the air nozzle 21 can be reasonably controlled only by the driving action of the screw rod 32 motor, so that when the movable block 2 rises, the columnar airbag 22 is in a straight state, and when the movable block 2 descends, the columnar airbag 22 is in a straight state. The airbag 22 is in a collapsed state, which effectively improves the disturbance effect on the catalyst and ensures a good drying effect; the limit block 216 can prevent the sealing block 212 from being pushed out of the shell 211 by the gas, ensuring good overall sealing; the setting of the spring 215 ensures that the air nozzle 21 can be in a closed state after the outlet pipe 14 or the inlet pipe 130 is separated from the corresponding air nozzle 21; the setting of the fixed column, on the one hand, plays a role in limiting the sealing block 212, and on the other hand, plays a role in fixing the sliding rod 214, and the sliding rod 214 can limit the displacement path of the sealing block 212, ensuring that the sealing block 212 can reliably enter the lower part of the shell 211 and accurately return to the upper part of the shell 211.

[0027] The portions of the air inlet pipe 130 and the air outlet pipe 14 that contact the air nozzle 21 are both hard, and the ends of the plurality of stoppers 216 form passages for the air inlet pipe 130 and the air outlet pipe 14 to enter and exit. In this way, after the air inlet pipe 130 or the air outlet pipe 14 contacts the air nozzle 21, the sealing block 212 can be reliably pushed to open the air nozzle 21.

[0028] The upper openings of the pair of shells 211 are respectively and one-to-one correspondingly directed toward the air inlet pipe 130 and the air outlet pipe 14 .

[0029] The spring 215 is sleeved on the slide bar 214, and when the spring 215 is in a fully compressed state, the top of the sealing block 212 is located below the lower opening of the housing 211. In this way, it is ensured that the sealing block 212 can fully enter the lower part of the housing 211, and it is also ensured that a gap for gas to pass through can be generated between the outer wall of the sealing block 212 and the inner wall of the housing 211.

[0030] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in the shape, structure, characteristics and spirit of the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A drying device for preparing high-porous honeycomb catalyst, characterized in that: The invention comprises a drying chamber for placing a catalyst, wherein a support plate and a porous partition are arranged in the drying chamber, the catalyst is placed between the partition and the top of the drying chamber, the support plate is located below the partition, an air duct for inputting dry hot air into the drying chamber is arranged on the support plate, an air chamber is formed between the support plate and the partition, the dry hot air first enters the air chamber and then passes upward through the partition, a movable block driven by a screw motor is also arranged between the partition and the top of the drying chamber, the screw motor comprises a motor body, a screw and a limit rod, and the movable block reciprocates in the vertical direction in the drying chamber The movable block is connected to the screw rod by a threaded connection, the limit rod is connected to the movable block by sliding, the movable block is spherical, the movable block is hollow, the top and bottom of the movable block are provided with a self-locking air nozzle, the outer wall of the movable block is provided with a plurality of columnar air bags connected with the inside of the movable block, the partition is provided with an air inlet pipe connected with the air source, the top of the drying chamber is provided with an air outlet pipe connected with the outside, the air inlet pipe, the air outlet pipe and the air nozzle are all on the same axis, and when the air outlet pipe or the air inlet pipe is inserted into the air nozzle, the air nozzle is in an open state; The gas nozzle comprises a convex-shaped shell, the upper inner diameter of the shell is smaller than the lower inner diameter of the shell, a sealing block and a plurality of limit blocks are arranged on the inner side of the upper part of the shell, the plurality of limit blocks are arranged along the inner wall of the upper part of the shell at intervals and in the same plane, a fixing rod is arranged on the inner side of the lower part of the shell, a sliding rod extending along the axis of the shell is arranged on the fixing rod, the sealing block is sleeved on the sliding rod and slides on the sliding rod, and a spring is arranged between the bottom of the sealing block and the fixing rod; The portions of the air inlet pipe and the air outlet pipe that are in contact with the air nozzle are both hard, and the ends of the plurality of limit blocks form a passage for the air inlet pipe and the air outlet pipe to enter and exit; The spring is sleeved on the slide rod, and when the spring is in a fully compressed state, the top of the sealing block is located below the lower opening of the shell.

2. The drying device for preparing high-porous honeycomb catalyst according to claim 1, characterized in that: The upper openings of a pair of the shells are respectively and one-to-one correspondingly oriented toward the air inlet pipe and the air outlet pipe.

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