A slurry coating apparatus and slurry coating method for a corrugated plate catalyst

Abstract

The present application relates to a kind of slurry coating device and slurry coating method of corrugated plate catalyst, device includes bearing frame, first weighing unit, coating suction chamber, feed unit, suction unit, second weighing unit, transfer unit, bearing frame is used to load corrugated plate catalyst;First weighing unit is used to weigh corrugated plate catalyst;Coating suction chamber is used to accommodate corrugated plate catalyst, pressure sensor is provided in coating suction chamber;Feed unit is used to transport slurry to coating suction chamber;Flow meter is provided on the pipeline that feed unit and coating suction chamber communicate;Suction unit and coating suction chamber are communicated;Second weighing unit is used to weigh corrugated plate catalyst;Transfer unit is used to transfer corrugated plate catalyst to coating suction chamber or away from coating suction chamber.The slurry coating device of corrugated plate catalyst of the present application can accurately control the uniformity, quality of corrugated plate catalyst slurry coating.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of corrugated plate catalyst preparation, and particularly relates to a slurry coating device and a slurry coating method for a corrugated plate catalyst. BACKGROUND

[0002] Coating of catalyst active ingredients is an important preparation step in the catalyst preparation process. Conventional coating is usually performed by immersing the carrier in slurry.

[0003] Currently, catalyst carrier coating generally uses zoned coating, which can effectively utilize the carrier space. Different active coatings are coated according to the changes in tail gas components in the stage chemical reaction stage, so that the carrier catalytic performance is more targeted, the utilization rate of noble metal is higher, and the amount of noble metal is saved. However, the existing technical solutions, which were submitted and published more than ten years ago, cannot meet the current latest catalyst, especially the catalyst coating technical requirements of the national standard VI. For example, patent US2012 / 0315381A1 Coating Device and Method also uses a coating cavity (Coating device 122), a coating valve (Extraction valve 137), a bypass pipe (Riser Tube 127), and several sensors for detection. The slurry is sent into the coating cavity by a slurry pump (Delivery Pump for Coating Medium 135), the catalyst carrier is placed on several probes in the coating cavity (Sensors for the level 123), the air ring is clamped, and then the feeding is started. After detection by the sensor (Sensros 126a / 126b / 126c / 126d), the coating is stopped, the coating valve is opened to remove excess slurry, and the coating process is completed. This coating process with feeding and suction belongs to the traditional catalyst coating process for decades. With the implementation of the national standard VI for tail gas emission and the industrial volatile organic waste gas treatment standard, the requirements for automation, precision, reliability, and product performance of catalyst production have risen to a new level. The patent cannot meet the technical requirements of the use demand.

[0004] The single block volume of the corrugated plate catalyst carrier is tens of times larger than that of the ordinary cordierite carrier (for example, 150*150*150mm or 100*100*100mm), and the weight of the single block is about 30kg, which is much smaller than that of the ordinary cordierite carrier (within 2kg). Since the whole block is not closed on all sides, the coating process of the ordinary cordierite carrier cannot be used.

[0005] The preparation process of the corrugated plate catalyst is as follows: a thin metal plate or a glass fiber plate is pre-pressed into a corrugated plate shape, cut into a uniform size, and then stacked into a catalyst carrier with through holes.

[0006] Compared with the cordierite carrier catalyst, the single block size of the corrugated plate catalyst is larger, the weight is lighter, the cost is lower under the condition of the same volume, the back pressure is low, the surface area participating in the catalytic reaction is larger, the gas flow velocity can be larger, and the gas flow resistance and catalytic performance do not decrease greatly, so that the loading volume and weight of the catalyst can be greatly reduced as a whole, and the use cost of the catalyst can be reduced.

[0007] The existing corrugated plate catalyst carrier adopts a dipping coating process, that is, the whole is soaked in slurry, then taken out and placed, and then the holes are air blown, which is low in efficiency, high in energy consumption, and high in slurry waste. Moreover, for the carrier with a height of more than 200 mm, the traditional soaking process may cause no coating inside. Or a slurry with low viscosity needs to be soaked (the slurry with low viscosity has good fluidity and can enter all the inside holes), and the low viscosity causes low adhesion of the active components of the slurry on the surface of the carrier, and low performance of the catalyst. SUMMARY

[0008] The purpose of the present application is to provide a slurry coating device and method for a corrugated plate catalyst.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0010] A slurry coating device for a corrugated plate catalyst comprises:

[0011] A bearing frame is used to load the corrugated plate catalyst, the upper side and the lower side of the bearing frame are provided with openings, a supporting part for supporting the corrugated plate catalyst is arranged in the bearing frame, and an opening is arranged on the supporting part and communicates with the space in the bearing frame;

[0012] A first weighing unit is used to weigh the initial corrugated plate catalyst;

[0013] A coating suction cavity is used to accommodate the initial corrugated plate catalyst, and a pressure sensor is arranged in the coating suction cavity;

[0014] A feeding unit is in communication with the coating suction cavity and used to deliver slurry into the coating suction cavity to coat the initial corrugated plate catalyst located on the coating suction cavity; a flow meter is arranged on the pipeline in communication between the feeding unit and the coating suction cavity;

[0015] a suction unit, the suction unit being in communication with the coating suction cavity, the suction unit being used to vacuumize the coating suction cavity and to suck the slurry in the coating suction cavity and the corrugated plate catalyst;

[0016] a second weighing unit, the second weighing unit being used to weigh the corrugated plate catalyst separated from the coating suction cavity;

[0017] a standing unit, the standing unit being used to place the corrugated plate catalyst weighed by the second weighing unit;

[0018] a transferring unit, the transferring unit being used to grab the corrugated plate catalyst and to transfer the corrugated plate catalyst to the coating suction cavity, to transfer the corrugated plate catalyst on the coating suction cavity to the standing unit.

[0019] According to some embodiments of the present application, the transferring unit comprises a clamping member, a pressing cap and a driving member, the clamping member being used to grab the bearing frame, the driving member being connected with the pressing cap and being used to drive the pressing cap to move in the vertical direction, when the clamping member clamps the bearing frame, the pressing cap is located above the upper opening of the bearing frame and is located directly above the corrugated plate catalyst.

[0020] According to some embodiments of the present application, the device further comprises a suction cavity, the suction cavity being arranged adjacent to the coating suction cavity, the suction cavity being located at the right side of the coating suction cavity, the suction unit being in communication with the suction cavity, the suction unit being used to vacuumize the suction cavity and to suck the slurry in the corrugated plate catalyst in the suction cavity.

[0021] According to some embodiments of the present application, the coating suction cavity comprises a first cavity and a second cavity, the first cavity being located above the second cavity, the first cavity and the second cavity being in communication through a coating suction valve;

[0022] the suction cavity comprises a third cavity and a fourth cavity, the third cavity being located above the fourth cavity, the third cavity and the fourth cavity being in communication through a suction valve.

[0023] According to some embodiments of the present application, the suction unit comprises a first vacuum pipeline, a vacuum pump and a second vacuum pipeline, the first vacuum pipeline being in communication with the coating suction cavity, the vacuum pump being arranged in the first vacuum pipeline, one end of the second vacuum pipeline being in communication with the first vacuum pipeline, the other end of the second vacuum pipeline being in communication with the suction cavity.

[0024] According to some embodiments of the present application, the first vacuum pipeline is provided with a first vacuum control valve, and the second vacuum pipeline is provided with a second vacuum control valve.

[0025] According to some embodiments of the present application, the suction unit further comprises a first slurry recovery pipeline and a second slurry recovery pipeline, one end of the first slurry recovery pipeline is in communication with the coating suction cavity, the other end of the first slurry recovery pipeline is in communication with the second slurry recovery pipeline, one end of the second slurry recovery pipeline is in communication with the suction cavity, and the other end of the second slurry recovery pipeline is in communication with the feeding unit.

[0026] According to some embodiments of the present application, the feeding unit comprises a slurry storage tank, a slurry conveying pipeline and a slurry conveying pump, the slurry storage tank is in communication with the coating suction cavity through the slurry conveying pipeline, and the slurry conveying pipeline is provided with a slurry conveying pump and a flow meter.

[0027] According to some embodiments of the present application, the device further comprises an adjusting pipeline, one end of the adjusting pipeline is in communication with the slurry storage tank, the other end of the adjusting pipeline is in communication with the slurry conveying pipeline, and the adjusting pipeline is provided with a pressure regulating valve.

[0028] According to some embodiments of the present application, the device further comprises a drying unit and a cooling unit, the drying unit is used for drying the corrugated plate catalyst after being rested in the resting unit, and the cooling unit is used for cooling the dried corrugated plate catalyst.

[0029] Another technical solution adopted by the present application is:

[0030] A coating method of the slurry coating device based on the corrugated plate catalyst, comprising:

[0031] S1, the corrugated plate catalyst is contained in a bearing frame, a transfer unit transfers the bearing frame and the corrugated plate catalyst to a first weighing unit, and the first weighing unit measures the mass M1 of the bearing frame and the corrugated plate catalyst without slurry coating;

[0032] S2, the transfer unit transfers the corrugated plate catalyst to a coating suction cavity and fixes and seals the corrugated plate catalyst;

[0033] S3, a feeding unit delivers slurry to the coating suction cavity, and the feeding speed is adjusted through a flow meter and a pressure sensor, when the slurry coating height in the corrugated plate catalyst is within a height setting range and the pressure in the coating suction cavity is within a pressure setting range, the slurry delivery is stopped.

[0034] S4, running the suction unit so that the coating suction cavity is set to a certain vacuum degree, and the excess slurry in the coating suction cavity and the corrugated plate catalyst hole is sucked away in a large flow and high vacuum degree mode;

[0035] S5, the transfer unit transfers the corrugated plate catalyst to the second weighing unit, and the second weighing unit measures the mass M2 of the coated corrugated plate catalyst;

[0036] S6, determining whether the difference between M2 and M1 is within a preset range, if yes, the corrugated plate catalyst is placed, dried and cooled; if the difference between M2 and M1 is higher than the preset range, repeating steps S4-S5; if the difference between M2 and M1 is less than the preset range, repeating steps S3-S5.

[0037] According to some embodiments of the present application, in step S3, when the slurry coating height H 理 of the corrugated plate catalyst 设 is greater than the height threshold, and when the difference absolute value |△P| between the theoretical pressure P 理 in the coating suction cavity and the measured actual pressure P 实 is less than the pressure threshold, the slurry delivery is stopped, wherein:

[0038] The theoretical coating height H 理 of the slurry in the corrugated plate catalyst is obtained by the following formula:

[0039] H 理 =(V all -V1) / (a*b*θ),

[0040] wherein V all is the cumulative flow of the flow meter after the start of feeding, a is the length of the carrier frame, b is the width of the carrier frame, V1 is the volume of the first cavity of the coating cavity, and θ is the porosity of the channel of the corrugated plate catalyst;

[0041] The theoretical pressure P in the coating cavity is obtained by the following formula:

[0042] P 理 =10*(H 理 +h)*d,

[0043] wherein H 理 is the theoretical coating height of the corrugated plate catalyst, h is the distance between the pressure sensor in the coating suction cavity and the lowermost end of the corrugated plate catalyst, and d is the density of the slurry.

[0044] Due to the use of the above technical solution, the present application has the following advantages compared with the prior art:

[0045] The slurry coating device for the corrugated plate catalyst of the present invention facilitates the coating of slurry on the corrugated plate catalyst by setting a support frame to accommodate the corrugated plate catalyst. Slurry is introduced into the lower part of the corrugated plate catalyst, and the flow rate of the coating slurry is controlled by a flow meter. The pressure in the coating suction chamber during the coating process is detected by a pressure sensor, ensuring the uniformity of the slurry in each channel of the corrugated plate catalyst. A first weighing unit and a second weighing unit determine whether quantitative coating has been completed, enabling precise control of the coating height, quality, and uniformity of the slurry in the corrugated plate catalyst. An extraction unit can remove excess slurry from the coating suction chamber and the corrugated plate catalyst. Attached Figure Description

[0046] Appendix Figure 1 This is a structural diagram of the slurry coating device for the corrugated plate catalyst of the present invention.

[0047] Appendix Figure 2 This is a structural diagram of the transfer unit of the slurry coating device for the corrugated plate catalyst of the present invention without the clamping support frame.

[0048] Appendix Figure 3 This is a structural diagram of the transfer unit clamping support frame of the slurry coating device for the corrugated plate catalyst of the present invention.

[0049] Appendix Figure 4 This is a cross-sectional view of the transfer unit of the slurry coating apparatus for the corrugated plate catalyst of the present invention without clamping the carrier frame.

[0050] Appendix Figure 5 This is a cross-sectional view of the transfer unit clamping support frame of the slurry coating apparatus for the corrugated plate catalyst of the present invention.

[0051] Appendix Figure 6 The curves showing the theoretical coating height versus the pressure within the coating support frame for a corrugated plate catalyst slurry (at a constant feed rate) are shown for comparison.

[0052] Appendix Figure 7 The curve of theoretical coating height of the corrugated plate catalyst slurry in the support frame versus the pressure in the coating support frame (the slurry feed rate decreases step by step) is shown in the example.

[0053] Appendix Figure 8 The slurry feeding control flowchart is shown in the example.

[0054] Appendix Figure 9 This is a structural diagram of a corrugated plate catalyst;

[0055] Appendix Figure 10 The structural diagram of an existing cordierite-supported catalyst;

[0056] In the attached diagrams above:

[0057] 1 - corrugated plate catalyst; 2 - first weighing unit;

[0058] 3 - transfer unit; 301 - cover, 302 - fixed plate, 303 - claw-shaped rod, 304 - roller, 305 - connecting rod, 306 - driving member, 307 - universal joint;

[0059] 4 - second cavity; 5 - fourth cavity; 6 - second weighing unit; 8 - control system; 9 - vacuum pump; 10 - first vacuum control valve; 11 - second vacuum control valve; 12 - coating suction cavity; 13 - suction cavity; 14 - first return valve; 15 - second return valve; 16 - sight glass cylinder; 17 - slurry conveying valve; 18 - slurry conveying pump; 19 - flow meter; 20 - pressure regulating valve; 21 - slurry storage tank; 22 - first cavity; 23 - third cavity; 24 - sight glass cylinder feed valve; 25 - sight glass cylinder discharge valve; 26 - adjusting pipeline; 27 - slurry conveying pipeline; 28 - second vacuum pipeline; 29 - first vacuum pipeline; 31 - pressure sensor; 32 - standing cavity; 33 - pre-drying heating cavity; 34 - final drying heating cavity; 35 - cooling cavity; 36 - slurry recovery container; 37 - first slurry recovery pipeline; 38 - second slurry recovery pipeline; 39 - bearing frame; 40 - limiting ring. DETAILED DESCRIPTION

[0060] The application will be further described below in connection with the embodiments shown in the drawings.

[0061] Example 1

[0062] Referring to Figures 1 to 5 The slurry coating device for the corrugated plate catalyst shown in the drawings comprises a bearing frame 39, a first weighing unit 2, a coating suction cavity, a suction cavity, a feeding unit, a suction unit, a second weighing unit 6, a transfer unit 3, a standing unit, wherein:

[0063] The corrugated plate catalyst 1 is not closed around the whole piece, and the corrugated plate catalyst 1 is loaded through the bearing frame 39, so as to facilitate slurry coating of the corrugated plate catalyst 1 and ensure coating precision and coating uniformity. The upper side and the lower side of the bearing frame 39 are provided with openings, and a supporting part for supporting the corrugated plate catalyst is arranged in the bearing frame. The supporting part is provided with an opening, and the opening is in communication with the space in the bearing frame. The supporting part can be in a mesh shape, and the outer periphery of the supporting part and the inner periphery of the bearing frame can be welded. The corrugated plate catalyst 1 enters the bearing frame 39 from the upper side opening of the bearing frame 39 and is located on the supporting part.

[0064] The coating suction cavity is used for accommodating the initial corrugated plate catalyst; the feeding unit is in communication with the coating suction cavity, and the feeding unit is used for conveying slurry into the coating suction cavity to coat the initial corrugated plate catalyst on the coating suction cavity with the slurry; the suction unit is in communication with the coating suction cavity, and the suction unit is used for vacuumizing the coating suction cavity and sucking the slurry in the coating suction cavity and the corrugated plate catalyst.

[0065] The coating suction cavity of the example comprises a first cavity 22 and a second cavity 4, the first cavity 22 is above the second cavity 4, the first cavity 22 and the second cavity 4 are in communication through a coating suction valve 12, the corrugated plate catalyst to be coated with slurry is placed on the first cavity 22, the upper part of the first cavity 22 is square and matches the outer shape size of the corrugated plate catalyst carrier, and the lower part of the first cavity 22 is conical (the diameter of the lower part gradually decreases from top to bottom) and is in butt joint with the second cavity 4.

[0066] A pressure sensor 31 is arranged in the first cavity 22 of the coating suction cavity, which is used for detecting the pressure in the first cavity 22 to control the uniformity of the slurry coating in each channel of the corrugated plate catalyst during the feeding process.

[0067] The device further comprises a suction cavity which is located on the right side of the coating suction cavity, and the suction unit is in communication with the suction cavity, and the suction unit is used for vacuumizing the suction cavity and sucking the slurry in the corrugated plate catalyst in the suction cavity. The suction cavity comprises a third cavity 23 and a fourth cavity 5, the third cavity 23 is above the fourth cavity 5, the third cavity 23 and the fourth cavity 5 are in communication through a suction valve 13. When the slurry is coated, the corrugated plate catalyst is first placed on the coating suction cavity, after the slurry is coated, the transfer unit 3 transfers the corrugated plate catalyst to the suction cavity (without slurry coating), and the excess slurry in the corrugated plate catalyst placed on the suction cavity is sucked out through the suction unit, so as to ensure the coating precision.

[0068] In the example, the coating suction cavity and the suction cavity are arranged, so that the continuous production can be realized, the production efficiency is improved, and the control of the slurry coating result is more stable.

[0069] The device of the example further comprises a sight glass cylinder 16, the sight glass cylinder 16 is in communication with the coating suction cavity, as shown in Figure 1 The sight glass cylinder 16 is in communication with the first cavity 22 and the second cavity 4, and specifically in communication through a three-way pipe, a sight glass cylinder feeding valve 24 is arranged on the pipeline in communication between the sight glass cylinder 16 and the first cavity 22, and a sight glass cylinder discharging valve 25 is arranged on the pipeline in communication between the sight glass cylinder 16 and the second cavity 4. When the corrugated plate catalyst is fixed on the first cavity 22, the sight glass cylinder discharging valve 25 is closed and the sight glass cylinder feeding valve 24 is opened during the coating process. The sight glass cylinder discharging valve 25 is opened and the sight glass cylinder feeding valve 24 is closed during the suction process. Through the arrangement of the sight glass cylinder, the coating condition of the slurry in the corrugated plate catalyst can be more directly observed.

[0070] The first weighing unit 2 is used for weighing the initial corrugated plate catalyst; the second weighing unit 6 is used for weighing the corrugated plate catalyst separated from the suction cavity. On the coating suction cavity, the initial corrugated plate catalyst on the coating suction cavity is coated with slurry, and is subjected to the first suction, and is then transferred to the suction cavity to be subjected to the second suction. The second weighing unit 6 weighs the corrugated plate catalyst separated from the suction cavity. By comparing the data of the two weighings, the quality of the slurry coated on the corrugated plate catalyst can be determined.

[0071] The first cavity 22 and the third cavity 23 of the example are both provided with a placing table for accommodating the bearing frame. The placing table is provided with a sealing ring. When the bearing frame is placed on the placing table, the sealing ring can be inflated to clamp the corrugated plate catalyst. After the suction is completed, the corrugated plate catalyst is loosened, and then the corrugated plate catalyst is taken away by the transfer unit.

[0072] In some embodiments, the suction unit includes a first vacuum pipeline 29, a vacuum pump 9, and a second vacuum pipeline 28. The first vacuum pipeline 29 communicates with the second cavity 4 of the coating suction cavity. The vacuum pump 9 is arranged on the first vacuum pipeline 29. The first vacuum pipeline 29 is provided with a first vacuum control valve 10. One end of the second vacuum pipeline 28 communicates with the first vacuum pipeline 29. The other end of the second vacuum pipeline 28 communicates with the fourth cavity 5 of the suction cavity. The second vacuum pipeline 28 is provided with a second vacuum control valve 11.

[0073] The suction unit further includes a first slurry recovery pipeline 37 and a second slurry recovery pipeline 38. One end of the first slurry recovery pipeline 37 communicates with the coating suction cavity. The other end of the first slurry recovery pipeline 37 communicates with the second slurry recovery pipeline 38. One end of the second slurry recovery pipeline 38 communicates with the suction cavity. The other end of the second slurry recovery pipeline 38 communicates with the slurry storage tank 21 of the feeding unit.

[0074] The feeding unit includes a slurry storage tank 21, a slurry delivery pipeline 27, a slurry delivery pump 18, and a slurry delivery valve 17. The slurry storage tank 21 is used for storing slurry. The slurry storage tank 21 communicates with the coating suction cavity through the slurry delivery pipeline 27. The slurry delivery pipeline 27 is provided with the slurry delivery pump 18, a flow meter 19, and the slurry delivery valve 17. The flow meter 19 is used for metering the injected slurry. The slurry delivery valve 17 controls the slurry flow.

[0075] The second cavity 4 of the coating suction cavity communicates with the slurry storage tank 21 through the first slurry recovery pipeline 37. The pipeline is provided with a first slurry recovery valve 14. The second cavity 4 of the suction cavity communicates with the slurry storage tank 21 through the second slurry recovery pipeline 38. The pipeline is provided with a second slurry recovery valve 15.

[0076] The device further comprises an adjusting pipeline 26, one end of which is in communication with the slurry storage tank 21, and the other end of which is in communication with the slurry conveying pipeline 27 (the other end of the adjusting pipeline 26 is in communication with the slurry conveying pipeline 27 at a position between the slurry conveying pump 18 and the flow meter 19), and the adjusting pipeline 26 is provided with a pressure regulating valve 20 for adjusting the feed pressure in the slurry conveying pipeline 27.

[0077] When the slurry is delivered to the first cavity 22 of the coating suction cavity, the coating suction valve 12 is closed, and the slurry conveying valve 17 is opened, so that the slurry rapidly fills the first cavity 22 and fills into the corrugated plate catalyst and the mirror barrel 16.

[0078] The transfer unit 3 is used to grab the corrugated plate catalyst and transfer the corrugated plate catalyst to or away from the coating suction cavity, or the transfer unit 3 is used to grab the corrugated plate catalyst and transfer the corrugated plate catalyst to or away from the suction cavity. The transfer unit 3 can be provided in multiple, such as two, and the two transfer units 3 are one-to-one corresponding to the coating suction cavity and the suction cavity.

[0079] Preferably, the transfer unit 3 comprises a clamping member for grabbing the carrier frame 39, a driving member 306 connected with the gland 301 for driving the gland 301 to move in the vertical direction, and when the clamping member clamps the carrier frame 39, the gland 301 is located above the upper opening of the carrier frame 39 and directly above the corrugated plate catalyst.

[0080] Referring to Figures 2-5 The outer periphery of the carrier frame 39 is provided with a limiting ring 40, which is arranged in a ring around the outer periphery of the carrier frame 39. If the cross section of the carrier frame 39 is square, the limiting ring 40 is a square ring.

[0081] The clamping member comprises a fixed plate 302 located above the gland 301, and a plurality of clamping units. The driving member 306 is connected with the fixed plate 302, and the driving shaft of the driving member 306 is connected with the gland 301 through a universal joint 307. The driving member 306 can be a telescopic cylinder, and the driving shaft of the telescopic cylinder is connected with the gland 301 through the universal joint 307.

[0082] The clamping unit is rotatably connected to the fixed plate 302 at one end and extends away from the fixed plate 302 at the other end. The periphery of the gland 301 is connected to the clamping unit through the connecting rod 305, so that the gland 301 is movably connected to the clamping unit. The clamping unit includes two claw-shaped rods 303, one end of each claw-shaped rod 303 being rotatably connected to the fixed plate 302, the other end of each claw-shaped rod 303 (the end of the two claw-shaped rods 303 away from the fixed plate 302) being used to abut against the carrier frame. The other end of each claw-shaped rod 303 is provided with a roller 304. The middle part of each claw-shaped rod 303 is connected to the gland 301 through the connecting rod 305 (one end of the connecting rod 305 is rotatably connected to the middle part of the claw-shaped rod 303, and the other end of the connecting rod 305 is rotatably connected to the gland 301). The roller 304 is located on the inner side of the claw-shaped rod 303, so that the roller 304 abuts against the limiting ring 40. The roller 304 moves in contact with the carrier frame 39 or the limiting ring 40 by rolling, which can reduce wear.

[0083] The specific implementation of the transfer unit 3 is as follows: when the drive shaft of the driving member 306 is retracted, the gland 301 rises, the connecting rod 305 drives the clamping unit to turn outward, the clamping unit opens, and the carrier frame 39 is released; when the drive shaft of the driving member 306 is extended, the gland 301 descends, the connecting rod 305 drives the clamping unit to turn inward to clamp the carrier frame 39. At this time, the gland 301 is located above the carrier frame, and the lower surface of the gland 301 can be flush with the upper surface of the carrier frame 39. The gland 301 does not extend into the carrier frame 39.

[0084] The clamping unit of the example is provided with four clamping units, two of which are oppositely arranged, and the other two are oppositely arranged. The four clamping units clamp the periphery of the carrier frame 39 respectively, and the clamping is more firm and stable.

[0085] Since the cross section of the entire corrugated plate catalyst 1 is square, the airflow during suction will cause uneven distribution, with large airflow in the middle of the cross section and small airflow on the four sides. When the transfer unit transfers the carrier frame and the corrugated plate catalyst 1 to the coating suction cavity, the gland 301 descends to the opening on the upper side of the carrier frame 39 and blocks the middle cross section airflow, leaving only the gap channel between the periphery of the gland 301 and the inner side of the carrier frame 39. At this time, suction is only applied to the four sides of the corrugated plate catalyst.

[0086] The static unit is used to place the corrugated plate catalyst weighed by the second weighing unit 6, and to wait for the slurry to settle. The temperature during static placement is 20-35℃, and the time is 3-15 minutes.

[0087] Referring to Figure 1The standing unit comprises a standing cavity 32. During the standing process, normal temperature air or cold air (temperature: 20-35℃) is blown from the bottom of the corrugated plate catalyst upwards to prevent the slurry coating from cracking or falling off. During the standing process, a small amount of slurry drips from the bottom of the corrugated plate catalyst. The standing cavity 32 is connected to the slurry recovery container 36, and the slurry is collected into the slurry recovery container 36. The advantages of setting the standing unit are as follows: the excess slurry on the corrugated plate catalyst is removed by blowing normal temperature air or cold air; if direct drying is performed, for example, hot air at a higher temperature is blown to the corrugated plate catalyst weighed by the second weighing unit, the surface layer of the slurry will dry, the slurry at the bottom of the corrugated plate catalyst will dry slowly, and the surface layer of the slurry is prone to cracking.

[0088] The device of the example also comprises a drying unit and a cooling unit. The drying unit is used to dry the corrugated plate catalyst after standing in the standing unit. The drying unit comprises a pre-drying unit and a final drying unit. The pre-drying unit comprises a pre-drying heating cavity 33. Hot air at a large flow rate is introduced into the bottom of the pre-drying heating cavity 33. The temperature of the hot air is set to 60-100℃. The hot air passes through the pores of the corrugated plate catalyst, and a large amount of water in the slurry is removed. The final drying unit comprises a final drying heating cavity 34. The preheated corrugated plate catalyst is placed into the final drying heating cavity 34. A certain flow rate of hot air is introduced into the bottom of the final drying heating cavity 34. The temperature of the hot air is set to 120-160℃. The hot air passes through the pores of the corrugated plate catalyst, and residual water in the slurry is removed. A part of the hot air discharged from the top of the final drying heating cavity 34 is returned to the bottom of the pre-drying heating cavity 33, mixed with fresh air, heated again to the pre-drying set temperature, and recycled to save heating energy consumption. A small part of the hot air discharged from the top of the final drying heating cavity 34 is discharged from the production equipment.

[0089] Preferably, a plurality of final drying heating cavities 34 can be provided, so that the pre-dried corrugated plate catalyst can pass through the plurality of final drying heating cavities 34 in sequence, and the quality of the coated slurry is ensured.

[0090] The cooling unit is used to cool the dried corrugated plate catalyst. The cooling unit comprises a cooling cavity 35. The dried corrugated plate catalyst is placed into the cooling cavity 35. A large flow rate of normal temperature air is introduced to remove the heat on the outer surface of the corrugated plate catalyst, so that the temperature of the outer surface of the corrugated plate catalyst is reduced, and the corrugated plate catalyst is convenient to carry in the later production. Thus, the entire coating process is completed.

[0091] The hot air in the pre-drying heating cavity 33 and the final drying heating cavity 34 of the example can pass through the outer surface and the pores of the corrugated plate catalyst from top to bottom or from bottom to top to remove a large amount of water in the slurry and realize the drying process. The fresh air in the cooling cavity 35 can pass through the outer surface and the pores of the corrugated plate catalyst from top to bottom or from bottom to top to cool.

[0092] The standing cavity 32 of the example is preferably communicated with the cooling cavity 35, and the hot air flowing out of the cooling cavity 35 enters the standing cavity 32, so that energy can be saved. The final drying heating cavity 34 can be provided in plurality, and the residence time of each corrugated plate catalyst in each final drying heating cavity can be equal, so that continuous production of the carrier catalyst can be realized.

[0093] Embodiment 2

[0094] A coating method of a slurry coating device based on a corrugated plate catalyst, comprising:

[0095] S1, the corrugated plate catalyst is contained in a bearing frame, and the bearing frame and the corrugated plate catalyst are moved to the first weighing unit 2 by the moving unit 3, and the first weighing unit 2 measures the mass M1 of the bearing frame and the corrugated plate catalyst without slurry coating;

[0096] S2, the moving unit 3 moves the corrugated plate catalyst to the coating suction cavity and fixes and seals it;

[0097] S3, the feeding unit feeds the slurry to the coating suction cavity, and when the slurry coating height H 理 in the corrugated plate catalyst is greater than the set coating height H 设 , and when the absolute value |△P| of the difference △P between the theoretical pressure P 理 in the coating suction cavity and the measured actual pressure P 实 is less than the pressure threshold, the feeding condition is met, the feeding is completed, and the slurry feeding is stopped; if one of the conditions is not met, the feeding is not completed;

[0098] Specifically:

[0099] The theoretical slurry coating height H 理 in the corrugated plate catalyst is obtained by the cumulative flow of the flow meter after the feeding starts, the theoretical pressure P 理 in the coating suction cavity is calculated, then the difference △H between the theoretical coating height H 理 and the set coating height H 设 (the height of the corrugated plate catalyst) is calculated, the difference △P between the theoretical pressure P 理 and the actual pressure P 实 is calculated, and the absolute value |△P| is taken.

[0100] The theoretical slurry coating height H 理 in the corrugated plate catalyst is obtained by the following formula:

[0101] H 理 =(V all -V1) / (a*b*θ),

[0102] wherein V allV = a * b * θ * (V - V1) / 1000, where V is the cumulative flow from the start of the feed, a is the length of the carrier frame, b is the width of the carrier frame, V1 is the volume of the first cavity of the coating cavity, and θ is the porosity of the channels of the corrugated plate catalyst.

[0103] Theoretical pressure in the coating cavity (pressure in the first cavity) P 理 P = 10 * (H + h) * d, where H is the theoretical coating height of the corrugated plate catalyst, h is the distance between the pressure sensor in the coating suction cavity and the lowermost end of the corrugated plate catalyst, and d is the slurry density.

[0104] P 理 = 10 * (H 理 +h) * d,

[0105] where H 理 is the theoretical coating height of the corrugated plate catalyst, h is the distance between the pressure sensor in the coating suction cavity and the lowermost end of the corrugated plate catalyst, and d is the slurry density.

[0106] Specific examples are as follows:

[0107] The carrier placement frame has dimensions of 465 mm * 465 mm, the corrugated plate catalyst itself has a height of 0.5 meters, the porosity θ is 85%, and the net volume V1 = 0.01 m 3 , the current measured cumulative flow V all = 0.1 m 3 , then the theoretical coating height H 理 of the corrugated plate catalyst is obtained by the following formula.

[0108] H 理 = (V all -V1) / (a*b*θ) = (0.1-0.01) / (0.465*0.465*0.85) = 0.489 m.

[0109] When the theoretical coating height of the corrugated plate catalyst calculated by the cumulative flow is 0.489 meters, and the distance h between the pressure sensor in the coating suction cavity and the lowermost end of the corrugated plate catalyst is 0.1 meters, the slurry density d is 1.25 kg / m 3 , and the corresponding theoretical pressure P 理 in the coating suction cavity is obtained by the following formula. P 理 = 10 * (H 理 + 0.1) * 1.25 = 7.36 Kpa.

[0110] When the coating set height H 设 is 0.5 meters (the height of the carrier), then

[0111] △H = H 理 - 0.5 = 0.489 - 0.5 = -0.011;

[0112] |△P| = |P 理P 实 | = |7.36 - P 实 |;

[0113] wherein, P 实 is obtained by the pressure sensor.

[0114] In some embodiments, the height threshold is set to 0.01 meter and the pressure threshold is set to 1 kPa.

[0115] When the coating feed is started, the slurry is fed into the first cavity 22 of the coating suction chamber by the slurry delivery pump 18 through the slurry delivery pipeline 27, and gradually and slowly fed into the corrugated plate catalyst from bottom to top. 理 The value of AH is gradually increased from a negative value to a positive value, and when the coating is completed, AH is a positive value and greater than the height threshold; P 理 The value of P is gradually increased from 0.

[0116] The specific embodiment of slurry coating using the slurry coating device of the corrugated plate catalyst of the present example is as follows:

[0117] When the coating feed is started at an initial constant feed flow rate, AH is less than 0 and |AP| is less than the set pressure threshold, and the feed is continued. When |AP| is greater than the set pressure threshold, the feed is paused for a period of time (1-5s, preferably 3s), and then the feed rate is reduced (to 30-60% of the initial constant feed flow rate, preferably 50%, and the reduced feed flow rate is a). At this time, |AP| will decrease until it is less than the pressure threshold, and the feed will continue. If AH is less than 0 and |AP| is greater than the set pressure threshold, the feed is paused again for a short period of time (1-5s, preferably 3s), and then the feed rate is reduced (to 30-60% of the previous feed flow rate a, preferably 50%). At this time, |AP| will decrease again until it is less than the pressure threshold, and the cycle will continue until AH is greater than 0 and greater than the height threshold, and the feed is completed.

[0118] In actual production, a larger initial feed rate is set to increase the feed rate and save production time. Because the slurry has a large viscosity, when the coating suction chamber is fed at a constant initial feed flow rate, the frictional resistance of the slurry in the corrugated plate catalyst rises rapidly during its upward movement, causing the pressure in the coating suction chamber to rise rapidly. Therefore, the actual measured pressure value P 实 The actual measured pressure value P all The theoretical height H 理 The pressure value P 理Excessive pressure causes the slurry to overflow rapidly from the gaps between the support frame and the corrugated catalyst, while some areas within the catalyst itself lack slurry flow. In this situation, even if the coating height calculated from the cumulative flow exceeds the height of the support body, there is still no slurry within the support, resulting in ineffective coating. Therefore, controlling and balancing the feed flow rate and the pressure within the coating suction chamber is crucial for achieving automated coating of qualified corrugated catalysts.

[0119] The following provides comparative examples and embodiments.

[0120] Example

[0121] The slurry coating apparatus for the corrugated plate catalyst of the present invention varies the feed flow rate during the coating process, see [link / reference]. Figure 7 .

[0122] Comparative Example

[0123] The slurry coating apparatus for the corrugated plate catalyst of the present invention employs a constant feed flow rate during the coating process. See [link to apparatus]. Figure 6 .

[0124] See Figure 6 , 7 The horizontal axis represents the theoretical height H of the slurry within the catalyst support. 理 The vertical axis represents the pressure inside the coated suction chamber. Figure 6 , 7 The dashed line in the figure represents the theoretical coating height H. 理 With theoretical pressure P 理 The relationship is shown in the solid line, which represents the theoretical coating height H. 理 Compared with actual pressure P 实 The relationship.

[0125] Figure 6 In the case where step S3 was not followed (i.e., when ΔH was less than 0 and |ΔP| was greater than the set pressure threshold of 1 kPa), the feed rate was not reduced after a short pause, but instead fed at a constant rate, resulting in slurry overflow and an actual pressure P... 实 Much greater than the theoretical pressure P 理 This resulted in the feeding process not being completed.

[0126] and Figure 7 In the process, when ΔH is detected to be less than 0 and ΔP is greater than 1 kPa, the feeding is briefly stopped (e.g., 1-5 s, preferably 3 s) and the feed flow rate is reduced to 30-60% (preferably 50%) of the original feed flow rate. Then the actual pressure P in the coating suction chamber will be reduced. 实 It will first decrease, then slowly increase again. The actual pressure value P of the coated suction chamber is as measured. 实 The pressure value P calculated by the total flow meter is exceeded again. 理1 KPa, again briefly stop feeding (such as 1-5s, preferably 3s) and then continue to reduce the flow rate of the coating suction cavity, reduced to 30-60% (preferably 50%) of the last feeding flow rate. In turn, the flow rate is reduced in several stages until AH is greater than 0 and greater than the height threshold.

[0127] The above operation can make the feeding process of the slurry more stable and improve the uniformity of the slurry in all channels of the corrugated plate catalyst.

[0128] S4, the second cavity 4 is vacuumed to a set vacuum degree by the suction unit, the coating suction valve 12 is opened (at the same time, the sight cylinder discharge valve 25 is quickly opened and then closed, so that the slurry in the sight cylinder 16 quickly flows into the second cavity 4), the second cavity 4 and the inside of the corrugated plate catalyst are filled with slurry, which is quickly sucked into the slurry storage tank 21, and part of the slurry adheres to the inner wall of the corrugated plate catalyst to achieve the coating purpose.

[0129] Preferably, during the suction process, the gland 301 also needs to be controlled to cover or not cover the upper surface of the corrugated plate catalyst. When the upper surface of the corrugated plate catalyst is covered, the slurry sucked mainly comes from the channels around the corrugated plate catalyst; when the upper surface of the corrugated plate catalyst is not covered, the slurry sucked mainly comes from the central channels of the corrugated plate catalyst, specifically:

[0130] When the second cavity 4 is at a set vacuum degree, the upper surface of the corrugated plate catalyst is first covered, which can make the gas flow through the corrugated plate catalyst along the gap between the outer peripheral edge of the corrugated plate catalyst and the inner wall of the bearing frame 39, the coating suction valve 12 is opened, and vacuum suction is started, the excess slurry in the second cavity 4 and the channels of the corrugated plate catalyst is sucked away by vacuum, and a through hole is formed; the gland 301 is controlled to move away from the upper surface of the corrugated plate catalyst, which can make the gas flow through the corrugated plate catalyst along the center of the corrugated plate catalyst, the coating suction valve 12 is opened, and vacuum suction is started, which can effectively suck the central channels and corner channels of the corrugated plate catalyst. This process can be repeated multiple times, and the gas flow can pass through the corrugated plate catalyst 1 along the center of the corrugated plate catalyst 1.

[0131] The specific embodiment of vacuumizing the second cavity 4 by the suction unit to a set vacuum degree is as follows: when the slurry delivery is stopped, the slurry delivery valve 17 is closed, the feeding to the first cavity 22 is stopped, the vacuum pump 9 is operated and the first vacuum control valve 10 is opened, the inside of the second cavity 4 reaches the set vacuum degree, then the first vacuum control valve 10 is closed, the inside of the second cavity 4 is maintained in a vacuum state; the coating suction valve 12 is opened, the first cavity 22 and the inside of the corrugated plate catalyst are filled with slurry which is quickly sucked into the second cavity 4, part of the slurry is adhered to the inner wall of the corrugated plate catalyst, the coating purpose is achieved, at the same time, the sight glass cylinder discharge valve 25 is quickly opened and then closed, the slurry in the sight glass cylinder 16 quickly flows into the second cavity 4, then the opening times of the first vacuum control valve 10 are controlled, and the vacuum suction is performed for multiple times to achieve the purpose of making all the holes in the catalyst carrier through.

[0132] After the suction, the first return valve 14 is opened to recycle the slurry to the slurry storage tank 21.

[0133] S5, the transfer unit 3 transfers the corrugated plate catalyst to the suction cavity and fixes it, the gland 301 of the other transfer unit 3 shields or moves away from the upper surface of the corrugated plate catalyst, the suction is started, and the inside of the corrugated plate catalyst is further formed with through holes, which can be referred to the step S4 to achieve the purpose of controlling the accurate loading amount.

[0134] The transfer unit 3 further transfers the corrugated plate catalyst to the second weighing unit 6, and the second weighing unit 6 measures the mass M2 of the coated corrugated plate catalyst.

[0135] S6, it is determined whether the difference between M2 and M1 is within a preset range, if yes, the corrugated plate catalyst is placed, dried and cooled; if the difference between M2 and M1 is higher than the preset range, the steps S4-S5 are repeated; if the difference between M2 and M1 is less than the preset range, the steps S3-S5 are repeated.

[0136] In the above step S4, the slurry on the corrugated plate catalyst is sucked by a large flow and a high vacuum degree to ensure that all the holes of the corrugated plate catalyst are through, wherein the large flow range is 10000-25000 cubic meters per hour, and the relative vacuum degree range is -30KPa to -80KPa; the suction time is 2-5 seconds, and the suction is performed 1-2 times.

[0137] In the above step S5, the slurry on the corrugated plate catalyst is sucked by a large flow and a high vacuum degree and a small flow and a low vacuum alternately to achieve the accurate loading amount. The small flow range is 80-800 cubic meters per hour, the relative vacuum degree range is -10KPa to -30KPa, the suction time is 30 seconds-90 seconds (preferably 1 minute), and the suction is performed 1-2 times.

[0138] The advantages of steps S4 and S5 are: if only step S4 is set, that is, only the coating suction cavity is set, if the coating suction cavity is continuously suctioned for multiple times, the slurry suctioned out is much, the slurry after suction flows back to the slurry storage tank, and the water in the part of the slurry volatilizes (the suction process is under a certain vacuum, the temperature is high, which causes the slurry to volatilize fast), the change of the viscosity of the slurry changes the characteristics of the slurry, and then the slurry flows to the coating suction cavity through the slurry storage tank, which directly affects the coating result. When the coating suction cavity and the suction cavity are set, the parameters (such as suction vacuum, suction time, and suction times) of the two are set, the influence on the slurry is small, the control of the coating result is more stable, and continuous production can be realized, which is high in production efficiency.

[0139] The specific implementation of the static drying and cooling of the corrugated plate catalyst is as follows:

[0140] The corrugated plate catalyst with a quality meeting the requirements after coating is placed in the static unit 32, and then is sequentially transferred to the pre-drying unit, the final drying unit, and the cooling unit.

[0141] After step S6, the following steps are further included:

[0142] After cooling, the corrugated plate catalyst carrier is taken out of the bearing frame, enters the calcination process, and then the corrugated plate catalyst is cut into any shape and packaged, and the packaged corrugated plate catalyst can be transported.

[0143] The advantages of the slurry coating device of the corrugated plate catalyst in the example are as follows:

[0144] The corrugated plate catalyst carrier is loaded by the bearing frame, which is convenient for the carrying of the corrugated plate catalyst product, and more importantly, in order to realize the coating, suction, static, drying, and cooling processes, the corrugated plate catalyst carrier is taken out of the bearing frame after cooling, enters the calcination process, and then the corrugated plate catalyst is cut into any shape and packaged, and the bearing frame can be reused. Compared with the existing technology of first packaging the corrugated plate carrier and then coating, drying, and calcining, the cost is low, and the utilization rate of the bearing frame is improved.

[0145] The slurry entering the corrugated plate catalyst from the lower part is judged by the first and second weighing units to determine whether the quantitative coating is completed, the slurry coating height, quality and uniformity of the corrugated plate catalyst can be precisely controlled, the multiple segmented coating of various coatings can be applied, the segmented coating needs of catalyst production are met, the coating conveying and recovery switching is realized, the coating recovery is facilitated by the lower suction unit, the coating is not polluted and overcoated, the catalyst coating is uniform, the catalyst coating quality is greatly improved, the raw materials are saved, the performance of the corrugated plate catalyst is improved, the weighing, coating, suction, weighing, standing, drying operations are realized, the stability of coating is improved by setting the flow control valve, pressure regulating valve and pressure sensor, the uniformity of suction is improved by setting the gland, the weighing data, coating flow, coating pressure, coating height, standing and drying time parameters can be set by the user, the user can read and modify conveniently through the touch screen, the digital level of the production line is improved, and the continuous production of the catalyst can be realized by adjusting the time of each step.

[0146] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A slurry coating apparatus for corrugated sheet catalysts, characterized by, The device comprises: a bearing frame for loading the corrugated plate catalyst, the bearing frame is provided with an opening on the upper side and the lower side, and a supporting part for supporting the corrugated plate catalyst is arranged in the bearing frame, and an opening is arranged on the supporting part; a first weighing unit for weighing the initial corrugated plate catalyst; a coating suction cavity for accommodating the initial corrugated plate catalyst, and a pressure sensor is arranged in the coating suction cavity; a feeding unit in communication with the coating suction cavity for conveying slurry into the coating suction cavity to coat the initial corrugated plate catalyst in the coating suction cavity, and a flow meter is arranged on the pipeline in communication with the coating suction cavity; a suction unit in communication with the coating suction cavity for vacuumizing the coating suction cavity and sucking the slurry in the coating suction cavity and the corrugated plate catalyst; a second weighing unit for weighing the corrugated plate catalyst separated from the coating suction cavity; a standing unit for placing the corrugated plate catalyst weighed by the second weighing unit; a transfer unit for grabbing the corrugated plate catalyst and transferring the corrugated plate catalyst to the coating suction cavity, and transferring the corrugated plate catalyst on the coating suction cavity to the standing unit.

2. A slurry coating apparatus for corrugated plate catalysts according to claim 1, characterized in that The transfer unit comprises a clamping piece for grabbing the bearing frame, a driving piece connected with the gland for driving the gland to move in the vertical direction, and when the clamping piece clamps the bearing frame, the gland is located above the upper opening of the bearing frame and directly above the corrugated plate catalyst.

3. A slurry coating apparatus for corrugated plate catalysts according to claim 2, characterized in that The device further comprises a suction cavity, the coating suction cavity is arranged adjacent to the suction cavity, and the suction unit is in communication with the suction cavity.

4. The slurry coating apparatus for corrugated plate catalysts of claim 1, wherein, The coating suction cavity comprises a first cavity and a second cavity, the first cavity is located above the second cavity, and the first cavity and the second cavity are communicated through a coating suction valve.

5. The slurry coating apparatus for corrugated plate catalysts of claim 3, wherein, The suction unit comprises a first vacuum pipeline, a vacuum pump, a second vacuum pipeline, a first slurry recovery pipeline, and a second slurry recovery pipeline, the first vacuum pipeline is in communication with the coating suction cavity, the vacuum pump is arranged in the first vacuum pipeline, one end of the second vacuum pipeline is in communication with the first vacuum pipeline, and the other end of the second vacuum pipeline is in communication with the suction cavity; one end of the first slurry recovery pipeline is in communication with the coating suction cavity, the other end of the first slurry recovery pipeline is in communication with the second slurry recovery pipeline, one end of the second slurry recovery pipeline is in communication with the suction cavity, and the other end of the second slurry recovery pipeline is in communication with the feeding unit.

6. The slurry coating apparatus for corrugated plate catalysts of claim 1, wherein, The feed unit comprises a slurry storage tank, a slurry conveying pipeline and a slurry conveying pump, the slurry storage tank is communicated with the coating suction cavity through the slurry conveying pipeline, and the slurry conveying pipeline is provided with the slurry conveying pump and a flow meter.

7. A slurry coating apparatus for corrugated plate catalysts according to claim 6, characterized in that The device further comprises an adjusting pipeline and a pressure regulating valve, one end of the adjusting pipeline is communicated with the slurry storage tank, the other end of the adjusting pipeline is communicated with the slurry conveying pipeline, and the adjusting pipeline is provided with the pressure regulating valve.

8. The apparatus for slurry coating of corrugated plate catalyst according to claim 1, wherein, The device further comprises a drying unit and a cooling unit, the drying unit is used for drying the corrugated plate catalyst after being placed in the placing unit, and the cooling unit is used for cooling the dried corrugated plate catalyst.

9. A coating method based on a slurry coating apparatus for corrugated plate catalysts according to any one of claims 1 to 8, characterized in that Comprise: S1, the corrugated plate catalyst is contained in a bearing frame, a transfer unit transfers the bearing frame and the corrugated plate catalyst to a first weighing unit, and the first weighing unit measures the mass M1 of the bearing frame and the corrugated plate catalyst without slurry coating; S2, the transfer unit transfers the corrugated plate catalyst to the coating suction cavity and fixes and seals it; S3, the feed unit delivers slurry to the coating suction cavity, and the feeding speed is adjusted through the flow meter and the pressure sensor, when the slurry coating height in the corrugated plate catalyst is within the set height range and the pressure in the coating suction cavity is within the set pressure range, the slurry delivery is stopped; S4, the suction unit is operated to make the coating suction cavity reach the set vacuum degree, and the excess slurry in the coating suction cavity and the holes of the corrugated plate catalyst is sucked away; S5, the transfer unit transfers the corrugated plate catalyst to a second weighing unit, and the second weighing unit measures the mass M2 of the coated corrugated plate catalyst; S6, it is judged whether the difference between M2 and M1 is within the preset range, if yes, the corrugated plate catalyst is placed, dried and cooled, if the difference between M2 and M1 is higher than the preset range, steps S4-S5 are repeated, and if the difference between M2 and M1 is less than the preset range, steps S3-S5 are repeated.

10. The method of claim 9, wherein the method is characterized by, In step S3, when the slurry coating height H 理 in the corrugated plate catalyst is greater than the set height H 设 by a difference ΔH, and when the theoretical pressure P 理 in the coating suction chamber is less than the measured actual pressure P 实 by an absolute value |ΔP| of the difference, slurry delivery is stopped, wherein: The theoretical coating height H of the slurry in the corrugated plate catalyst is obtained by the following formula: H 理 = (V all - V1) / (a*b*θ), where V all is the cumulative flow from the start of the feed, a is the length of the carrier frame, b is the width of the carrier frame, V1is the volume of the first cavity of the coating cavity, and Θ is the porosity of the channels of the corrugated plate catalyst. The theoretical pressure P of the coating cavity is obtained by the following formula: P 理 = 10 * (H 理 + h) * d, where H 理 is the theoretical coated height of the corrugated plate catalyst, h is the distance between the pressure sensor in the coating suction chamber and the lowermost end of the corrugated plate catalyst, and d is the slurry density.

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