Exhaust gas preheating type corrugated plate catalyst drying calcination furnace

Abstract

The utility model relates to a kind of waste gas preheating type corrugated plate catalyst drying calcining furnace, belong to calcining furnace field, to solve high-temperature waste heat flow from the bottom of drying chamber is sent in, preferentially contact lower layer placed corrugated catalyst blank, lower layer blank quickly absorbs flue gas heat to complete surface and internal dehydration, appear the problem of temperature rise too fast, blank premature solidification drying, a kind of waste gas preheating type corrugated plate catalyst drying calcining furnace, including base, fixedly connected in the drying chamber above base, fixedly connected in the calcining chamber one side of drying chamber, fixedly connected in the cooling area one side of calcining chamber, calcining chamber is communicated with drying chamber by gas guide pipe, in the process of push plate rotation, push away one side air and form negative pressure area, so that the hot air of corrugated plate lower surface is guided to the space formed by baffle and push plate, so as to reach the effect that hot air is directly acted on the upper surface of corrugated plate, guaranteeing that drying degree is as consistent as possible, making subsequent calcining effect better.

Description

Technical Field

[0001] This invention relates to the field of calcining furnaces, and particularly to a waste gas preheating corrugated plate catalyst drying and calcining furnace. Background Technology

[0002] The mainstream SCR corrugated plate denitrification catalyst adopts an integrated drying and calcining furnace to complete the process of drying the preform and high-temperature crystal activation. This type of catalyst uses glass fiber corrugated substrate as the skeleton. The substrate is densely covered with micron-sized fiber micropores. The corrugated plates and flat plates are bonded and stacked to form a through millimeter-sized airflow channel. During the production process, after the glass fiber corrugated preform is impregnated with vanadium-titanium catalytic slurry, it needs to be dehydrated in the drying section to ensure that the catalytic slurry is stably attached to the fiber micropores of the substrate and the inner wall of the channel before being sent to the calcining section for high-temperature shaping and activation.

[0003] To reduce natural gas energy consumption and improve the thermal energy utilization rate of industrial furnaces, existing integrated drying and calcining furnaces generally adopt a waste gas preheating waste heat circulation structure: high-temperature flue gas of 450~550℃ generated in the downstream calcination section is drawn out by a waste heat return fan and transported to the upstream drying section as the main drying heat source, replacing part of the direct-fired natural gas heat source, significantly reducing the overall operating energy consumption of the equipment. Due to the structural characteristics of corrugated plate catalysts and the requirements of the drying process, the drying section of this type of equipment generally adopts a bottom-supply, bottom-up ventilation structure; on the one hand, the high-temperature hot flue gas has a low density, and the bottom-up flow direction conforms to the natural flow law of hot fluids, resulting in less wind resistance for waste heat transportation; on the other hand, the rising airflow can completely penetrate the corrugated plate and connect the airflow channel, ensuring the dehydration effect of the inner wall of the channel and the core of the plate, while matching the exhaust logic of the exhaust fan at the top of the drying chamber, facilitating the timely discharge of water vapor evaporated from the billet, and the gentle rising airflow will not wash away the uncured wet catalyst coating.

[0004] However, this energy-saving structure and bottom-up air supply method have inherent technical defects that cannot be avoided in actual industrial production, which seriously restrict the yield rate and production stability of the finished catalyst: First, after the high-temperature waste heat airflow is sent into the drying chamber from the bottom, it will preferentially contact the corrugated catalyst blank placed on the lower layer. The lower blank quickly absorbs the heat of the flue gas to complete the surface and internal dehydration, resulting in the problem of excessively rapid heating and premature curing and drying of the blank.

[0005] Premature drying of the lower layer of the preform will cause the slurry on the surface of the board to form a crust quickly, sealing the microporous structure of the fiberglass substrate and preventing residual moisture inside the preform from escaping. When it is subsequently sent to the calcination section, the sealed moisture inside expands rapidly when heated, which can easily cause the catalyst board to crack and the coating to peel off. On the other hand, if the upper layer of the preform is not dried thoroughly and is too wet, it will cause problems such as peeling and incomplete crystal activation when it enters the high-temperature calcination zone. This will result in large dispersion of denitrification activity and mechanical strength parameters of the same batch of catalyst products, and a low product yield. Summary of the Invention

[0006] The purpose of this invention is to provide a waste gas preheating corrugated plate catalyst drying and calcining furnace, which solves the problem that when the high-temperature waste heat gas is sent into the drying chamber from the bottom, it preferentially contacts the corrugated catalyst blank placed on the lower layer, and the lower blank quickly absorbs the heat of the flue gas to complete the surface and internal dehydration, resulting in excessively rapid heating and premature curing and drying of the blank.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a waste gas preheating corrugated plate catalyst drying and calcining furnace, comprising a base, a drying chamber fixedly connected above the base, a calcining chamber fixedly connected to one side of the drying chamber, a cooling zone fixedly connected to one side of the calcining chamber, and a gas guide pipe connecting the calcining chamber and the drying chamber. A waste gas filter is provided in the middle of the gas guide pipe, a corrugated pipe is connected to one end of the gas guide pipe, an air outlet is fixedly connected to the upper end of the corrugated pipe, a rotating mechanism is provided above the air outlet, a guiding mechanism is provided inside the rotating mechanism, and an exhaust mechanism is provided on one side of the guiding mechanism. The rotating mechanism is used to drive the guide mechanism to rotate. During the rotation of the push plate, it pushes open the air on one side to form a negative pressure zone, so that the hot air on the lower surface of the corrugated plate is guided into the space formed by the baffle and the push plate, and then acts on the upper surface of the corrugated plate after being guided.

[0008] Preferably, the rotating mechanism includes a servo motor fixedly connected to the outside of the drying room, a rotating shaft fixedly connected to the output end of the servo motor, a rotating rod fixedly connected to one end of the rotating shaft, and a baffle fixedly connected to the upper end of the rotating rod. The lower end of the rotating rod is fixedly connected to the air outlet.

[0009] Preferably, the central axis of the baffle and the central axis of the air outlet are on the same plane.

[0010] Preferably, the width of the air outlet is greater than the width of the baffle.

[0011] Preferably, a heater is provided inside the upper end of the baffle to heat the baffle and reduce water vapor liquefaction.

[0012] Preferably, the guiding mechanism includes a push plate fixedly connected to the lower surface of the baffle and a guide plate fixedly connected to the inner side of the push plate; two guide plates are symmetrically arranged about the central axis of the baffle.

[0013] Preferably, the guide plate is arc-shaped.

[0014] Preferably, the exhaust mechanism includes a first exhaust pipe connected to the outside of the push plate and a second exhaust pipe fixedly connected to the inner wall of the drying chamber; there are two first exhaust pipes symmetrically arranged about the baffle.

[0015] Preferably, the width of the second exhaust pipe is greater than the distance between the two first exhaust pipes.

[0016] Preferably, the central axis of the second exhaust pipe is perpendicular to the base.

[0017] 1. Compared with the prior art, the beneficial effects of the present invention are as follows: During the rotation of the pusher plate, because the pusher plate is perpendicular to the baffle and located on both sides below the baffle, it pushes open the air on one side to form a negative pressure zone. This allows the hot air on the lower surface of the corrugated plate to be guided into the space formed by the baffle and the pusher plate, and then discharged downwards after being guided by the guide plate and the second baffle, acting on the upper surface of the corrugated plate. This achieves the effect of allowing the hot air to directly act on the upper surface of the corrugated plate, ensuring that the drying degree is as consistent as possible between the top and bottom, and improving the subsequent calcination effect.

[0018] 2. In this invention, the downward-moving hot air blocked by the second baffle collides with the upward-moving hot air from the outlet, creating opposing airflows inside the corrugated plate. This causes the airflow to move to both sides, pushing the coating applied to the outside of the corrugated plate inwards. After colliding in the middle, the coating diffuses to both sides, resulting in a larger coating distribution area. This achieves the effect of improving the uniformity and firmness of the coating distribution and preventing the coating from peeling off during subsequent calcination.

[0019] 3. This invention controls the rotation of the servo motor via an external controller, ensuring that the air duct formed by the air outlet, the second baffle, and the guide plate is always perpendicular to the corrugated plate. This allows the coating to move inwards towards the center of the corrugated plate as it collides and moves to both sides. This further increases the coating distribution area and improves the subsequent filtration effect of the corrugated plate.

[0020] 4. In this invention, after the gas enters the space formed by the baffle and the pusher, a portion of it is discharged from the first exhaust pipe. The width of the second exhaust pipe is greater than the distance between the two first exhaust pipes, ensuring that the exhaust gas discharged from the first exhaust pipe remains within the range of the second exhaust pipe. This achieves the effect of reducing the free movement of exhaust gas.

[0021] 5. In this invention, the first and second exhaust pipes are not connected, preventing the dilute sulfuric acid produced by the liquefaction of moisture and the fusion of acidic substances in the exhaust gas from flowing back along the first exhaust pipe to the inside of the baffle and then falling onto the corrugated plate. This achieves the effect of reducing dilute sulfuric acid pollution and ensuring the drying effect of the corrugated plate.

[0022] 6. The central axis of the second exhaust pipe of this invention is perpendicular to the base, causing the dilute sulfuric acid to fall vertically from the second exhaust pipe, reducing the likelihood of it liquefying at the top of the drying chamber and falling onto the corrugated plate. This achieves the effect of reducing the contamination of the corrugated plate by the dilute sulfuric acid and improving the drying quality.

[0023] 7. When the pusher plate rotates, the heater inside the upper part of the baffle plate is activated, causing the baffle plate to generate high temperature. This reduces the occurrence of dilute sulfuric acid, produced by the liquefaction of water vapor and the fusion of acidic substances, falling onto the corrugated plate. This further reduces the generation and contamination of dilute sulfuric acid and ensures the drying effect of the corrugated plate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a front view schematic diagram of the rotating rod structure of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle; Figure 4 This is a top view cross-sectional structural diagram of the first exhaust pipe of the present invention; Figure 5 This is a schematic diagram comparing the widths of the baffle and the corrugated pipe of the present invention; Figure 6 This is a schematic diagram of the airflow direction of the baffle and the bellows in this invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point B.

[0025] In the diagram: 1. Base; 2. Drying chamber; 3. Calcination chamber; 4. Cooling zone; 5. Air duct; 6. Exhaust gas filter; 7. Corrugated pipe; 8. Air outlet; 9. Rotating mechanism; 10. Heater; 11. Guiding mechanism; 12. Exhaust mechanism; 91. Servo motor; 92. Rotating shaft; 93. Rotating rod; 94. Baffle; 111. Push plate; 112. Guide plate; 113. Air guide plate; 121. First exhaust pipe; 122. Second exhaust pipe. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-7This invention provides the following embodiment: This device is specifically designed for an integrated process of high-temperature preheating, drying, and calcination curing of corrugated sheets for industrial filters. It is compatible with standardized industrial corrugated sheet workpieces, with standard dimensions of 800mm in length, 600mm in width, and 15mm in thickness for a single workpiece. The corrugated sheet surface features a matrix-like, uniform arrangement of micro-permeable pores. The pore diameter is 1.5mm, and the center-to-center distance between adjacent pores is 3mm. This dense microporous structure maintains the static air permeability of the entire sheet at only 18%. This structural characteristic is the core hardware cause of uneven temperature distribution on the upper and lower surfaces of the corrugated sheet, low hot air utilization, severe side air overflow, and uneven coating penetration in traditional drying processes. In the entire process flow, the corrugated sheet first undergoes a low-temperature preheating and dehumidification process. After the initial removal of free moisture from the sheet surface, it formally enters the high-temperature calcination and drying stage. At this point, the distributed heating elements inside calcination chamber 3 are activated, and the temperature is precisely controlled by a PID constant temperature control system to maintain a stable high-temperature calcination condition of 380℃~420℃ inside the calcination chamber. This process is used to perform high-temperature curing, micropore shaping, and coating sintering on the preheated corrugated plate. The calcination process is a high-temperature oxidation reaction, which continuously generates a large amount of high-temperature process waste gas. The waste gas contains trace amounts of acidic ultrafine impurities such as sulfides and chlorides, as well as high-temperature water vapor, and has a slight corrosive effect. If it is directly returned to the drying chamber 2, it will corrode the uncured corrugated plate substrate and surface coating. Therefore, the calcination waste gas is uniformly guided and transported to the outside of the drying chamber 2 through a dedicated gas guide pipe 5 to avoid disorderly diffusion of the waste gas. A high-precision multi-media exhaust gas filter 6 is connected in series in the middle section of the air duct 5. Internally, it incorporates a fiberglass filter layer and activated carbon adsorption composite filter material, effectively removing over 92% of large acidic impurities and dust particles. This significantly reduces the corrosiveness of the exhaust gas and lowers the pollution level inside the drying chamber 2. Only ultrafine acidic aerosols with a particle size less than 0.5μm are not intercepted and are continuously transported with the airflow. The pre-purified high-temperature exhaust gas undergoes pressure stabilization, vibration reduction, and flow equalization treatment through the flexible corrugated pipe 7 at the end of the air duct 5, eliminating airflow pulses and pressure fluctuations. Finally, it is uniformly sprayed vertically upwards from the outlet 8 at a constant wind speed of 12–15 m / s and a stable positive wind pressure of 850–900 Pa. This ensures a uniform, stable, and turbulent hot air field acting on the lower surface of the corrugated plate, providing a stable airflow foundation for subsequent drying operations.

[0028] The flexible corrugated pipe 7 adopts a multi-layer stainless steel foil spiral winding structure with low axial equivalent stiffness, allowing for free expansion and contraction along the axial direction (expansion / contraction ±10-15mm), serving as a flexible compensation element in the pipeline system. When the high-temperature exhaust gas output from the calcination chamber 3 is transported through the gas guide pipe 5, the airflow itself experiences certain pressure pulsations (peak-to-peak value approximately 150-200Pa) and velocity fluctuations due to the periodic on / off switching of the distributed heating elements inside the calcination chamber 3. The corrugated structure of the corrugated pipe 7 has the following pressure stabilization and vibration reduction mechanisms: the axial expansion and radial expansion of the corrugated pipe 7 can absorb the pressure pulsations within the pipeline, acting as a buffer and reducing the peak pressure by approximately 30-40%; the corrugated layer of the corrugated pipe 7 undergoes periodic elastic deformation during airflow pressure fluctuations, and the friction between the corrugations converts some of the pulsation energy into heat energy dissipation; the equivalent flow area of ​​the corrugated pipe 7 automatically fine-tunes with changes in internal pressure, achieving passive flow regulation and stabilizing the outlet air velocity.

[0029] After being buffered by the bellows 7, the airflow pulsation amplitude is reduced to within ±30Pa, and the wind speed fluctuation is controlled within ±0.5m / s, achieving the triple effects of pressure stabilization, vibration reduction, and flow uniformity.

[0030] After the high-temperature exhaust gas is continuously transported for 3-5 seconds and a stable and uniform hot air field is formed at the air outlet 8, the rotating mechanism 9 mounted above the air outlet 8 is activated, entering the dynamic uniform air drying mode. The rotating mechanism 9 is a servo precision swing structure, mainly composed of a servo motor 91 fixedly installed on the outside of the drying chamber 2, a rotating shaft 92 coaxially fixed at the output end of the servo motor 91, a rotating rod 93 fixed at the end of the rotating shaft 92, and a circular baffle 94 fixed at the upper end of the rotating rod 93. The overall structure is rigidly connected and synchronously follows without gaps. The lower end of the rotating rod 93 is fixedly connected to the outer wall of the air outlet 8, so that the entire rotating mechanism is precisely aligned with the hot air output position of the air outlet, ensuring that the swing trajectory always covers the corrugated plate drying area. The equipment adopts a 5-second complete cycle timed forward and reverse rotation control program, with a single forward swing angle of +15° and a reverse swing angle of -15°, and low-speed uniform reciprocating swing, avoiding airflow turbulence, sudden changes in wind pressure, and local eddies caused by high-speed rotation, ensuring dynamic stability of the airflow field. In terms of structural dimensions, the central axis of the baffle 94 and the central axis of the air outlet 8 are completely coplanar and located on the same vertical central plane, achieving precise center alignment. The opening width of the air outlet 8 is 120mm, and the width of the baffle 94 is 80mm. The width of the air outlet is greater than the width of the baffle, leaving sufficient gap for hot air flow. This not only enables airflow convergence and control but also avoids obstructing the main hot air output, preventing pipe pressure buildup, hot air backflow, and other malfunctions, ensuring stable and controllable air pressure at the air outlet throughout the process.

[0031] The position of each corrugated sheet entering the drying chamber 2 is monitored in real time by a conveyor belt encoder. When the workpiece reaches directly above the air outlet 8, a photoelectric sensor (located at the corresponding position on the inner wall of the drying chamber 2) outputs a positioning signal, which triggers the servo motor 91 to start via the PLC controller. Therefore, the swinging motion of the air outlet 8 and the baffle 94 is triggered by the workpiece's positioning signal, rather than based on a fixed timing sequence. When each corrugated sheet reaches the area of ​​the air outlet 8, the workpiece positioning signal triggers the rotation mechanism 9, and the air outlet 8 and the baffle 94 swing according to the actual position of the current workpiece, rather than maintaining a specific phase relationship with the workpiece. Since the swing range of the baffle 94 is ±15°, and the coverage width is approximately 400mm, which is much larger than half the 600mm width of the corrugated sheet, the hot air coverage area of ​​the air outlet 8 is sufficient to cover the effective drying area of ​​the entire corrugated sheet.

[0032] The lower surface of the baffle 94 is integrally fixedly connected to the arc-shaped push plate 111. The push plate 111 has an overall arc-shaped wind-catching structure. Two arc-shaped guide plates 112 are symmetrically fixedly installed on the inner side. The two sets of guide plates are strictly arranged symmetrically about the central axis of the baffle 94 to form a symmetrical air-collecting and guiding channel.

[0033] During low-speed oscillation, the pusher plate 111 pushes aside air on one side, creating localized airflow disturbance and a slight pressure difference (approximately -20 to -50 Pa) between the baffle 94 and the inner side of the pusher plate 111. Although this pressure difference is much smaller than the negative pressure of a conventional vacuum cleaner, it is sufficient to effectively guide the flow of hot air (with a density approximately 60-70% of that of room temperature air). Simultaneously, since hot air naturally tends to rise, the slight guiding effect is enough to direct it into the air collection space. The core mechanism of this design is to utilize negative pressure for "guidance" rather than "forceful adsorption," redirecting the hot air that would otherwise escape from the side to the upper surface of the corrugated plate through the oscillation of the pusher plate 111, thus achieving the reuse of residual heat.

[0034] When the servo motor 91 drives the pusher plate 111 to reciprocate at low speed, the pusher plate 111 continuously pushes aside the stationary air on one side, rapidly changing the local airflow velocity and pressure distribution. This creates a guiding effect within the air collection space formed by the bottom surface of the baffle 94, the inner side of the pusher plate 111, and the guide plate 112. This guiding field covers the upper part of the corrugated plate, guiding the residual hot air overflowing from the plate surface after the hot air from the lower surface of the corrugated plate penetrates, as well as the residual hot air drifting from the side, to converge into the interior of the air collection space.

[0035] As a large amount of high-temperature gas continues to converge and accumulate, and the pressure inside the cavity gradually increases, the airflow automatically splits. The first part of the mainstream airflow converges towards the center along the arc-shaped slope of the double-sided arc-shaped guide plate 112, and changes its direction of movement after being limited and guided by the air guide plate 113.

[0036] The downward pressure of 9–11 m / s and approximately 500–600 Pa is a natural result of the original hot air kinetic energy (12–15 m / s, 850–900 Pa) at outlet 8 after being rectified by the contraction of the air collection space cross-section; it is not an increase in energy out of thin air. After penetrating the micropores of the corrugated plate and overcoming the friction resistance along the pipeline, some residual pressure remains in the side overflow hot air at outlet 8. After this residual hot airflow is guided into the air collection space by the negative pressure field, the velocity naturally increases because the outlet cross-sectional area of ​​the air collection space is smaller than the inlet diffusion area, according to the continuity equation.

[0037] With a stable wind speed of about 8 to 10 m / s and a downward thrust of about 500 to 600 Pa, the air is sprayed vertically downwards and directionally, acting on the entire upper surface of the corrugated plate from top to bottom, realizing the recovery and reuse of waste heat, and specifically making up for the process shortcomings of insufficient heat source on the upper surface.

[0038] In the traditional static drying process, the air outlet 8 continuously outputs high-temperature hot air from bottom to top, directly hitting the lower surface of the corrugated plate. The heat source is concentrated and the heat exchange efficiency is high, so the drying and heating rate of the lower surface of the corrugated plate can reach 4.5℃ / min. However, the upper surface of the corrugated plate has no active heat source and only relies on the ambient residual heat to heat up naturally, with a heating rate of only 1.8℃ / min. There is a huge temperature gradient and drying rate difference between the upper and lower surfaces, which can easily cause defects such as over-drying of the lower surface, incomplete drying of the upper surface, uneven moisture content of the plate surface, and deformation and cracking during subsequent calcination.

[0039] The increased heating rate of the upper surface is the combined effect of three heat sources: the original hot air from the bottom, penetrating the micropores of the corrugated plate, contributes approximately 1.0℃ / min through direct radiation and convection heat transfer to the upper surface; the side overflow waste heat recovered by the negative pressure gas collection contributes approximately 0.6-0.8℃ / min; and the heater 10 installed inside the upper end of the baffle 94, after being energized and heating up, directly supplements the heat to the upper surface through thermal radiation and conduction, contributing approximately 0.6-0.8℃ / min. The combination of these three factors results in a total heating rate of approximately 2.2-2.6℃ / min for the upper surface.

[0040] Due to the inherent structural characteristics of corrugated sheets, the micropores on the sheet surface have low air permeability. Only a very small portion of hot air can penetrate the sheet surface from bottom to top through the micropores. The majority of the remaining high-temperature hot air quickly overflows from the assembly gaps on the left and right sides of the corrugated sheet, drifting upwards and accumulating, resulting in a significant waste of heat and further exacerbating the problem of uneven drying between the upper and lower surfaces. This device uses the guiding field created by the swinging pusher plate 111 to recover and gather part of the waste heat airflow that overflows from the sides. This heat is then pressed onto the upper surface of the corrugated sheet by the downward pushing air pressure, continuously replenishing and raising the temperature of the upper surface. This effectively reduces the drying temperature difference between the upper and lower surfaces, making the temperature field and drying rate of the entire corrugated sheet more uniform, providing a more uniform temperature foundation for subsequent high-temperature calcination and curing.

[0041] Because the baffle 94 and the air outlet 8 are coplanar and precisely aligned, during operation, the downward-pushing hot air from top to bottom and the original hot air from bottom to top converge at the center plane of the corrugated plate. The pressure of the original hot air at the bottom is stable at 850-900 Pa, and the pressure of the downward-pushing hot air at the top is stable at 500-600 Pa. The pressure difference is stable, and the airflow diffuses laterally to the surrounding area of ​​the plate after converging.

[0042] After the two-way airflows converge, the vertical airflows cancel each other out and release pressure. The excess airflow diffuses evenly and laterally around the corrugated plate surface, forming a uniform lateral airflow across the entire plate surface. This helps to spread the modified filter coating pre-applied on the outer side of the corrugated plate evenly along the plate surface, promoting the directional penetration, filling, and spreading of the coating into the micropores and interlayer gaps of the plate.

[0043] The coating undergoes airflow convergence and diffusion in the central airflow convergence area of ​​the board, and spreads evenly to the surrounding areas with the lateral diffusion airflow. This effectively solves the problems of coating accumulation, uneven thickness, and incomplete micropore sealing caused by traditional brushing and static drying, thereby effectively increasing the coating distribution area and enhancing the coating adhesion uniformity and bonding firmness.

[0044] The inner surface of the air guide plate 113 is an arc-shaped guide surface (with a "C"-shaped cross-section). This arc-shaped surface, together with the arc-shaped slope of the guide plate 112, forms a complete semi-circular guide channel. When the horizontal centripetal airflow reaches the arc-shaped guide surface of the air guide plate 113 along the arc-shaped slope of the guide plate 112, the arc-shaped surfaces of the air guide plate 113 and the guide plate 112 are geometrically complementary, forming a structure similar to a wind tunnel guide vane. Under the forced constraint of the arc-shaped guide surface, the airflow smoothly turns along the curvature of the arc surface, gradually transitioning from horizontal centripetal to vertical downward. The radius of curvature of this arc-shaped guide surface is designed to be R30-R50mm, so that the centrifugal force of the airflow during the turn matches the flow velocity, preventing airflow separation or vortices. This structural design is a mature guide technology in fluid mechanics.

[0045] The corrugated plate has a wavy curved surface. Lateral horizontal forces have a component perpendicular to the plate surface on the inclined surface, which helps the coating wet and spread towards the micropores. Simultaneously, the penetration of the coating into the micropores is a combined effect of capillary action, dynamic airflow pressure, and the coating's own gravity. The main role of lateral airflow is to promote uniform spreading of the coating along the plate surface, prolong the contact time between the coating and the micropore inlets, and assist capillary action in completing the penetration.

[0046] When two airflows converge, their vertical momentum cancels each other out, causing the airflows to change direction and diffuse laterally around the surface of the board. This is a basic phenomenon in fluid mechanics. After a brief stay and relative increase in concentration in the central airflow convergence zone, the coating spreads evenly in all directions with the laterally diffusing airflow. This is a unified process—first converging and concentrating, then diffusing and spreading.

[0047] The equipment is equipped with an external controller that can collect real-time data on panel temperature and servo swing angle, calibrate the real-time rotation angle of servo motor 91, and dynamically fine-tune the orientation of the guide air duct to ensure that the airflow direction of the guide air duct remains relatively perpendicular to the overall horizontal plane of the corrugated plate. For the inclined surface of the corrugated plate, the airflow forms a lateral diffusion along the inclined surface, further optimizing the coating distribution effect.

[0048] The corrugated plate has a wavy, curved surface with local undulations of ±2-3mm, but the overall plane of the plate is horizontal. The airflow direction of the device's guide duct is vertically calibrated based on the overall horizontal plane of the corrugated plate, rather than being perpendicular to each local inclined surface. Since the outlet width is approximately 400mm, much larger than the amplitude of the undulations (±2-3mm), the impact of local undulations on the outlet angle is within ±2°, and does not affect the overall airflow coverage and drying uniformity.

[0049] Throughout the process of negative pressure gas collection, airflow countercurrent, and plate surface heating, a large amount of high-temperature gas continuously flows into the gas collection space enclosed by baffle 94 and push plate 111, causing the internal air pressure to continuously accumulate and rise. To avoid internal pressure buildup, air pressure turbulence, airflow backflow, and imbalance of the drying temperature field, the airflow is automatically diverted and depressurized. The second part of the diverted airflow is quickly discharged outward through two first exhaust pipes 121 symmetrically arranged on the left and right sides of push plate 111, achieving pressure stabilization and airflow balance within the cavity, ensuring the continuous stability of the dynamic drying process. An integrated second exhaust pipe 122 is fixedly installed on the inner wall of drying chamber 2. The overall opening width of the second exhaust pipe is 320mm, which is greater than the center-to-center distance of 210mm between the two sets of first exhaust pipes 121. This ensures that all waste heat gas discharged from the first exhaust pipe 121 is confined within the coverage and flow range of the second exhaust pipe 122, thoroughly constraining the waste gas flow trajectory, preventing the disorderly movement and local accumulation of high-temperature waste gas and humid airflow, and ensuring that the temperature field and airflow field inside drying chamber 2 are uniform and stable throughout, with no high-temperature dead zones or areas of airflow turbulence.

[0050] Due to the physical filtration limitations of exhaust gas filter 6, the equipment can only efficiently intercept large particles and large-diameter acidic impurities and dust, but cannot capture ultrafine acidic aerosol particles with a diameter of less than 0.5μm. The overall filtration residue rate of acidic impurities in the exhaust gas is about 8%, and trace amounts of acidic aerosols will continue to enter the exhaust pipe with the hot and humid airflow. During the drying process, the free water and crystal water inside the corrugated plate continue to evaporate at high temperatures, generating a large amount of water vapor, which enters the far end of the exhaust pipe along with the exhaust gas. The second exhaust pipe 122 is far from the high-temperature calcination zone, and the ambient temperature of the pipe drops rapidly to below 45℃, reaching the critical temperature for water vapor liquefaction. A large amount of water vapor condenses into tiny water droplets upon cooling, which fully fuse and react with the ultrafine acidic aerosols remaining in the airflow, generating trace amounts of corrosive dilute sulfuric acid droplets. To prevent acid contamination of the workpieces, the equipment adopts a double-layer split exhaust structure. The first exhaust pipe 121 and the second exhaust pipe 122 are independent of each other, with no connecting gaps or joints. The dilute sulfuric acid generated by liquefaction cannot flow back to the baffle 94 and the corrugated plate drying area along the first exhaust pipe 121, completely eliminating acid dripping and contaminating the plate surface. At the same time, the second exhaust pipe 122 is strictly vertically arranged perpendicular to the base 1, with a pipe verticality error of ≤0.5°. The dilute sulfuric acid generated by liquefaction can only drip vertically downwards at a uniform speed along the pipe wall, and is finally collected and treated. It will not spread, stick to, or disperse on the upper inner wall of the drying chamber, minimizing the risk of acid corrosion contamination, effectively ensuring the cleanliness of the corrugated plate surface, and significantly improving the quality and pass rate of the dried finished product.

[0051] Throughout the entire operation cycle of the pusher plate 111 reciprocating, airflow counter-drying, and exhaust gas emission, the heater 10 embedded inside the upper end of the baffle 94 is simultaneously activated. The temperature is precisely controlled by a constant temperature control module, maintaining the baffle body temperature continuously at 110℃~120℃. The high-temperature baffle can continuously reheat and dehumidify the surrounding humid air, significantly increasing the dew point temperature of the surrounding air. This suppresses the low-temperature liquefaction and condensation of water vapor at the source, greatly reducing the conditions and amount of dilute sulfuric acid formation, and preventing acidic droplets from adhering to, corroding, and contaminating the corrugated plate surface.

[0052] Through a multi-protection structure of mechanical airflow optimization, constant temperature anti-condensation, and double-layer isolation to prevent backflow, the system comprehensively avoids problems such as board surface contamination, coating damage, and substrate corrosion during the drying and calcination process, ensuring the finished product quality, structural integrity, and performance of the corrugated board throughout the entire drying and calcination process.

[0053] The term "comprising" is used to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between those entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A preheated corrugated plate catalyst drying and calcining furnace for waste gas, comprising a base (1), a drying chamber (2) fixedly connected above the base (1), a calcining chamber (3) fixedly connected to one side of the drying chamber (2), a cooling zone (4) fixedly connected to one side of the calcining chamber (3), and a gas guide pipe (5) connecting the calcining chamber (3) and the drying chamber (2), characterized in that, An exhaust gas filter (6) is provided in the middle of the air guide pipe (5). One end of the air guide pipe (5) is connected to a corrugated pipe (7). An air outlet (8) is fixedly connected to the upper end of the corrugated pipe (7). A rotating mechanism (9) is provided above the air outlet (8). A guide mechanism (11) is provided inside the rotating mechanism (9). An exhaust mechanism (12) is provided on one side of the guide mechanism (11). The rotating mechanism (9) is used to drive the guide mechanism (11) to rotate. During the rotation of the push plate (111), it pushes open the air on one side to form a negative pressure zone, so that the hot air on the lower surface of the corrugated plate is guided to the space formed by the baffle (94) and the push plate (111), and then acts on the upper surface of the corrugated plate after being guided.

2. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 1, characterized in that, The rotating mechanism (9) includes a servo motor (91) fixedly connected to the outside of the drying chamber (2), a rotating shaft (92) fixedly connected to the output end of the servo motor (91), a rotating rod (93) fixedly connected to one end of the rotating shaft (92), and a baffle (94) fixedly connected to the upper end of the rotating rod (93). The lower end of the rotating rod (93) is fixedly connected to the air outlet (8).

3. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 2, characterized in that, The central axis of the baffle (94) and the central axis of the air outlet (8) are on the same plane.

4. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 2, characterized in that, The width of the air outlet (8) is greater than the width of the baffle (94).

5. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 2, characterized in that, A heater (10) is provided inside the upper end of the baffle (94) to heat the baffle (94) and reduce water vapor liquefaction.

6. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 2, characterized in that, The guiding mechanism (11) includes a push plate (111) fixedly connected to the lower surface of the baffle (94) and a guide plate (112) fixedly connected to the inner side of the push plate (111); there are two guide plates (112) symmetrically arranged about the central axis of the baffle (94).

7. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 6, characterized in that, The guide plate (112) is arc-shaped.

8. The waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 6, characterized in that, The exhaust mechanism (12) includes a first exhaust pipe (121) connected to the outside of the push plate (111) and a second exhaust pipe (122) fixedly connected to the inner wall of the drying chamber (2); there are two first exhaust pipes (121) symmetrically arranged about the baffle (94).

9. A waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 8, characterized in that, The width of the second exhaust pipe (122) is greater than the distance between the two first exhaust pipes (121).

10. A waste gas preheating corrugated plate catalyst drying and calcining furnace according to claim 8, characterized in that, The central axis of the second exhaust pipe (122) is perpendicular to the base (1).

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