Corrosion-resistant air preheater for petroleum refining

Abstract

The invention relates to the technical field of petroleum refining, in particular to a corrosion-resistant petroleum refining air preheater which comprises an equipment frame, a heat exchange mechanism, a driving mechanism and a dust removal mechanism. A heat exchange box is fixedly connected into the equipment frame, an assembling support is arranged in the center of the heat exchange box and divides the inner space of the heat exchange box into a first heat exchange cavity and a second heat exchange cavity, and a first assembling cavity, a second assembling cavity and a third assembling cavity located between the first assembling cavity and the second assembling cavity are formed in one side of the assembling support. A first air inlet pipe is arranged in the first assembly cavity, a first air outlet pipe is arranged at the bottom of the heat exchange box, the first air inlet pipe and the first air outlet pipe are both communicated with the first heat exchange cavity, a second air inlet pipe is arranged in the second assembly cavity, a second air outlet pipe is arranged at the top of the heat exchange box, and the second air inlet pipe and the second air outlet pipe are both communicated with the second heat exchange cavity. According to the corrosion-resistant air preheater for petroleum refining, particles are effectively prevented from being attached to the surfaces of the heat collection pieces for a long time to corrode the heat exchange disc.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum refining, in particular to a corrosion-resistant air preheater for petroleum refining. Background Art

[0002] Currently, the low-carbon economy is becoming a new round of global economic growth and a focus of competition among countries. Optimizing resource and energy structures, advocating low-carbon consumption patterns, reducing greenhouse gas emissions, and promoting the development of a low-carbon economy have become unshakable trends.

[0003] With the development of a low-carbon economy, my country's refining and petrochemical market has undergone profound changes, with cleaner and more advanced refining processes and products becoming the prevailing trend. Air preheaters are used to improve the heat exchange performance of heating furnaces and reduce energy consumption. They are crucial for energy conservation and consumption reduction in refinery heating furnaces. By exchanging heat between the high-temperature flue gases in the furnace and the air used for combustion, they lower exhaust temperatures and raise air temperatures, thereby improving efficiency, reducing fuel consumption, and minimizing harmful gas emissions.

[0004] However, reducing the exhaust gas temperature of heating furnaces in oil refineries currently faces challenges such as dust corrosion from low dew point in air preheaters and the limitations of existing corrosion-resistant materials. Therefore, it is urgent to develop a new air preheater that can operate stably and long-term despite dew point corrosion caused by excessively low exhaust gas temperatures. Summary of the Invention

[0005] The invention provides a corrosion-resistant air preheater for petroleum refining, which can remove dust attached to a heat dissipation plate in real time and prevent the components of the air preheater from being corroded.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A corrosion-resistant air preheater for petroleum refining comprises an equipment frame, a heat exchange mechanism, a driving mechanism and a dust removal mechanism; a heat exchange box is fixedly connected to the equipment frame, an assembly bracket is provided in the center of the heat exchange box, the assembly bracket divides the internal space of the heat exchange box into a first heat exchange chamber located at the bottom and a second heat exchange chamber located at the top, a first assembly chamber, a second assembly chamber and a third assembly chamber located between the first assembly chamber and the second assembly chamber are provided on one side of the assembly bracket, a first air inlet pipe is provided in the first assembly chamber, a first air outlet pipe is provided at the bottom of the heat exchange box, and a first The air inlet pipe and the first air outlet pipe are both connected to the first heat exchange chamber, the second air inlet pipe is arranged in the second assembly chamber, and the second air outlet pipe is arranged on the top of the heat exchange box. The second air inlet pipe and the second air outlet pipe are both connected to the second heat exchange chamber. The third assembly chamber is located on the inner side of the heat exchange box. High-pressure gas exhaust ports connected to the third assembly chamber are arranged on the upper and lower end faces of the heat exchange box. The high-pressure gas exhaust port is externally connected to a dust collection device. A smoke inlet pipe is arranged at the lower end of the heat exchange box and a smoke exhaust pipe is arranged at the upper end. A flue corresponding to the smoke inlet pipe and the smoke exhaust pipe is arranged on the assembly bracket.

[0008] Furthermore, the heat exchange mechanism includes a first-level heat exchange component located in the first heat exchange chamber and a second-level heat exchange component located in the second heat exchange chamber. The first-level heat exchange component includes a first annular guide rail and a first heat exchange disk. The first annular guide rails are two fixed in the first heat exchange chamber. The outer side of the first heat exchange disk is fixedly connected with a first annular stop edge that is compatible with the two first annular guide rails, and the first annular guide rail slides with the first annular stop edge; the second-level heat exchange component includes a second annular guide rail and a second heat exchange disk. The second annular guide rails are two fixed in the second heat exchange chamber. The outer side of the second heat exchange disk is fixedly connected with a second annular stop edge that is compatible with the two second annular guide rails, and the second annular guide rail slides with the second annular stop edge.

[0009] Furthermore, a first cover plate is provided on the upper end surface of the first heat exchange plate, and a second cover plate is provided on the lower end surface of the second heat exchange plate. The curvature of both the first cover plate and the second cover plate is greater than 90°. When the first cover plate rotates and completely blocks the flue from the bottom, the second cover plate is separated from the top of the flue. When the second cover plate rotates and completely blocks the flue from the top, the first cover plate is separated from the flue.

[0010] Furthermore, air flow holes are provided on the first cover plate and the second cover plate.

[0011] Furthermore, the driving mechanism includes a protective shell and a second motor, the protective shell is fixedly connected to the outside of the heat exchange box, and a first rotating shaft and a second rotating shaft are arranged in the middle of the top of the protective shell and the lower edge of the heat exchange box, the first rotating shaft and the second rotating shaft are arranged in parallel, and the first rotating shaft is coaxially fixed with a first synchronous gear and a first driving gear, and the second rotating shaft is coaxially fixed with a second synchronous gear and a second driving gear, and the first synchronous gear and the second synchronous gear are meshed with each other, and the first driving gear and the second driving gear are both located in the protective shell, and avoidance holes corresponding to the first driving gear and the second driving gear are respectively provided on the heat exchange box, and a first gear ring meshed with the first driving gear is fixedly connected to the outside of the first heat exchange disk, and a second gear ring meshed with the second driving gear is fixedly connected to the outside of the second heat exchange disk; the output shaft of the second motor is coaxially fixed with the first rotating shaft.

[0012] Furthermore, the dust removal mechanism is located in the third transfer chamber, and the dust removal mechanism includes a dust removal box. The thickness of the dust removal box is the same as the thickness of the assembly bracket. The two ends of the dust removal box are open. The dust removal box is located between the two high-pressure gas exhaust ports. The upper and lower ends of the dust removal box are respectively connected to the second heat exchange chamber and the first heat exchange chamber. A rotating drum is rotatably connected between the two opposite surfaces of the dust removal box. The rotating drum is arranged in a horizontal direction. A plurality of high-pressure airflow nozzles are set on the outer circumference of the rotating drum. A high-pressure air inlet pipe is fixedly connected to the outside of the dust removal box. The high-pressure air inlet pipe is sealed and rotatably connected to the end of the rotating drum extending out of the dust removal box.

[0013] Furthermore, the dust removal mechanism includes a first motor and a rocker arm. The output shaft of the first motor is provided with a drive disk. A drive pin is provided on the end face of the drive disk away from the first motor. The drive pin is eccentrically arranged. The rocker arm is fixed to the end of the rotating drum extending out of the dust removal box. A sliding hole is provided on the rocker arm. The drive pin is slidably arranged in the sliding hole. When the first motor drives the drive disk to rotate circumferentially, the eccentrically arranged drive pin slides in the sliding hole, driving the rocker arm and the rotating drum to rotate circumferentially.

[0014] Furthermore, the dust removal mechanism includes a guide cone, which is a plurality of guide cones fixedly connected to the rotating drum. The plurality of guide cones divide the rotating drum into multiple air flow distribution chambers. The tip of the guide cone is arranged toward one side of the high-pressure air intake pipe. Spiral blades are provided on the outer surface of the guide cone. The rotating drum has a double-layer structure. The inner layer and the outer layer of the rotating drum are hollow. The inner wall of the rotating drum is stamped with a spiral air flow groove, which connects two adjacent air flow distribution chambers.

[0015] Furthermore, the inner diameters of the exhaust ports of the multiple high-pressure airflow nozzles increase successively in a direction away from the high-pressure air inlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The corrosion-resistant air preheater for petroleum refining disclosed in the present invention adopts a double-layer counter-rotating first-stage heat exchange component and a second-stage heat exchange component. After the flue gas flows through the first heat exchange plate and the second heat exchange plate in sequence, it first exchanges heat with the first heat exchange plate, and then exchanges heat with the second heat exchange plate for the second time. The double-layer heat absorption design can effectively absorb most of the heat in the smoke, and the heat exchange efficiency is higher. After the heat exchange, the first and second heat exchange plates are rotated to the positions of the first and second air inlet pipes, and the air in the first and second air inlet pipes is preheated, so that the heated air is transported to different positions of the heating furnace to meet different temperature requirements.

[0018] The present invention discloses a two-stage heat exchange mechanism, which can be designed as a multi-stage heat exchange according to actual customer needs.

[0019] 2. In the corrosion-resistant air preheater for petroleum refining disclosed in the present invention, when performing heat exchange operations, when high-temperature flue gas passes through the interior of the equipment from bottom to top, the power of the flue gas can provide an upward push on the heat exchange component from below, which can overcome the gravity of the heat exchange component to a certain extent and provide auxiliary support for the sliding fit between the annular guide rail and the annular retaining edge.

[0020] 3. The corrosion-resistant air preheater for petroleum refining disclosed in the present invention can dynamically remove smoke and dust from the heat dissipation component on the opposite side of the flue, preventing smoke and dust particles from adhering to the surface of the heat exchange plate for a long time. At the same time, the continuous high-pressure airflow can also prevent the occurrence of low-temperature condensation, further improving the corrosion resistance of the air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view of a corrosion-resistant air preheater for oil refining according to an embodiment;

[0022] Figure 2 A perspective view of the corrosion-resistant air preheater for oil refining in another embodiment;

[0023] Figure 3 Schematic diagram of the heat exchange mechanism of the embodiment;

[0024] Figure 4 Schematic diagram of the internal structure of the heat exchange mechanism of the embodiment;

[0025] Figure 5 This is a schematic structural diagram of the first heat exchange plate assembled with the first cover plate in the embodiment;

[0026] Figure 6 A schematic structural diagram of the second heat exchange plate assembled with the second cover plate in the embodiment;

[0027] Figure 7 This is a schematic structural diagram of a protective housing according to an embodiment;

[0028] Figure 8This is a schematic diagram of the structure of the internal components of the protective housing of the embodiment;

[0029] Figure 9 It is a structural diagram of the dust removal mechanism;

[0030] Figure 10 This is a partial cross-sectional view after the guide cone is installed in the rotating drum.

[0031] In the figure: 100-equipment rack, 101-heat exchange box, 102-assembly bracket, 103-first heat exchange chamber, 104-second heat exchange chamber, 105-first assembly chamber, 106-second assembly chamber, 107-third assembly chamber, 108-first air inlet pipe, 109-first air outlet pipe, 110-second air inlet pipe, 111-second air outlet pipe, 112-high-pressure gas exhaust port, 113-smoke inlet pipe, 114-smoke exhaust pipe, 115-flue.

[0032] 201 - first annular guide rail, 202 - first heat exchange plate, 203 - first annular baffle, 204 - second annular guide rail, 205 - second heat exchange plate, 206 - second annular baffle, 207 - first cover plate, 208 - second cover plate.

[0033] 301 - protective housing, 302 - second motor, 303 - first rotating shaft, 304 - second rotating shaft, 305 - first synchronous gear, 306 - first driving gear, 307 - second synchronous gear, 308 - second driving gear, 309 - first gear ring, 310 - second gear ring.

[0034] 401-dust removal box, 402-rotating drum, 403-high-pressure air flow nozzle, 404-high-pressure air intake pipe, 405-first motor, 406-rocker arm, 407-drive disk, 408-drive pin, 409-slide hole, 410-guide cone, 411-air flow distribution chamber, 412-spiral blade, 413-spiral air flow through groove. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] See also Figure 1-7 This embodiment provides a corrosion-resistant air preheater for petroleum refining, including an equipment frame 100, a heat exchange mechanism, a drive mechanism, and a dust removal mechanism.

[0037] A heat exchange box 101 is fixedly connected to the equipment rack 100. An assembly bracket 102 is provided in the center of the heat exchange box 101. The assembly bracket 102 divides the internal space of the heat exchange box 101 into a first heat exchange chamber 103 at the bottom and a second heat exchange chamber 104 at the top. A first assembly chamber 105, a second assembly chamber 106 and a third assembly chamber 107 located between the first assembly chamber 105 and the second assembly chamber 106 are provided on one side of the assembly bracket 102. Holes are provided at positions corresponding to the first assembly chamber 105 and the second assembly chamber 106 of the heat exchange box 101. A first inlet is provided in the first assembly chamber 105. An air duct 108 is provided, and a first air outlet duct 109 is provided at the bottom of the heat exchange box 101. The first air inlet duct 108 and the first air outlet duct 109 are both connected to the first heat exchange chamber 103. A second air inlet duct 110 is provided in the second assembly chamber 106. A second air outlet duct 111 is provided on the top of the heat exchange box 101. The second air inlet duct 110 and the second air outlet duct 111 are both connected to the second heat exchange chamber 104. The third assembly chamber 107 is located on the inner side of the heat exchange box 101. A high-pressure gas exhaust port 112 connected to the third assembly chamber 107 is provided on the upper and lower end faces of the heat exchange box 101. The high-pressure gas exhaust port 112 is externally connected to a dust collection device. A flue gas inlet pipe 113 is provided at the lower end of the heat exchange box 101, and a flue gas outlet pipe 114 is provided at the upper end. The flue gas inlet pipe 113 and the flue gas outlet pipe 114 are respectively connected to the external flue pipe, and a flue 115 corresponding to the flue gas inlet pipe 113 and the flue gas outlet pipe 114 is provided on the assembly bracket 102.

[0038] The heat exchange mechanism consists of two sets, including a first-stage heat exchange component located in the first heat exchange chamber 103 and a second-stage heat exchange component located in the second heat exchange chamber 104. The first-stage heat exchange component includes a first annular guide rail 201 and a first heat exchange disk 202. The first annular guide rail 201 is fixed to two in the first heat exchange chamber 103. The outer side of the first heat exchange disk 202 is fixedly connected with a first annular retaining edge 203 adapted to the two first annular guide rails 201. The upper surface of the first annular retaining edge 203 located above and the upper surface of the first annular guide rail 201 located below are both provided with a plurality of first sliding posts. The first annular guide rail 201 located above is slidably connected to the upper side of the first annular guide rail 201 above through the first sliding post. The first annular retaining edge 203 located below is fixedly connected to the upper side of the first annular guide rail 201 above through the first sliding post. The first slide is slidably connected to the top of the first annular guide rail 201 below; the secondary heat exchange assembly includes a second annular guide rail 204 and a second heat exchange disk 205, the second annular guide rail 204 is two fixed in the second heat exchange chamber 104, and the outer side of the second heat exchange disk 205 is fixedly connected with a second annular retaining edge 206 adapted to the two second annular guide rails 204, and the upper surface of the second annular retaining edge 206 located above and the upper surface of the second annular guide rail 204 located below are both provided with multiple second slides, the second annular guide rail 204 located above is slidably connected to the top of the second annular guide rail 204 above through the second slide, and the second annular retaining edge 206 located below is slidably connected to the top of the second annular guide rail 204 below through the second slide.

[0039] As a preferred solution of this embodiment, a first cover plate 207 is provided on the upper end surface of the first heat exchange disk 202, and a second cover plate 208 is provided on the lower end surface of the second heat exchange disk 205. The arcs of the first cover plate 207 and the second cover plate 208 are both greater than 90°. When the first cover plate 207 rotates and completely blocks the flue 115 from below, the second cover plate 208 is separated from the top of the flue 115. When the second cover plate 208 rotates and completely blocks the flue 115 from above, the first cover plate 207 is separated from the flue 115. This structural design can achieve alternating short-term residence of the flue gas in the first heat exchange chamber 103 and the second heat exchange chamber 104, thereby increasing the heat exchange time between the flue gas and the first heat exchange disk 202 and the second heat exchange disk 205. It should be pointed out that when the air preheater is not equipped with a dust removal mechanism, the first cover plate 207 and the second cover plate 208 are as follows. Figure 5 and Figure 6 As shown, when the first cover plate 207 and the second cover plate 208 are used together with a dust removal mechanism, air flow holes (not shown) are provided on the first cover plate 207 and the second cover plate 208. The air flow holes are preferably flat holes extending in the radial direction.

[0040] The driving mechanism includes a protective housing 301 and a second motor 302. The protective housing 301 is fixedly connected to the outside of the heat exchange box 101. A first rotating shaft 303 and a second rotating shaft 304 are set between the top of the protective housing 301 and the lower edge of the heat exchange box 101. The first rotating shaft 303 and the second rotating shaft 304 are arranged in parallel. The first rotating shaft 303 is coaxially fixedly connected to the first synchronous gear 305 and the first driving gear 306. The second rotating shaft 304 is coaxially fixedly connected to the second synchronous gear 307 and the second driving gear 308. 8. The first synchronous gear 305 and the second synchronous gear 307 are meshed and driven. The first drive gear 306 and the second drive gear 308 are both located within the protective housing 301. The heat exchange box 101 is provided with avoidance holes corresponding to the first drive gear 306 and the second drive gear 308. A first gear ring 309 is fixedly connected to the outer side of the first heat exchange disk 202 and meshes with the first drive gear 306. A second gear ring 310 is fixedly connected to the outer side of the second heat exchange disk 205 and meshes with the second drive gear 308. The output shaft of the second motor 302 is coaxially fixedly connected to the first rotating shaft 303. When the second motor 302 drives the first rotating shaft 303 to rotate, the meshing transmission between the first synchronous gear 305 and the second synchronous gear 307 causes the second rotating shaft 304 to rotate synchronously with the first rotating shaft 303 in opposite directions. The first drive gear 306 and the second drive gear 308 drive the first heat exchange disk 202 and the second heat exchange disk 205 to rotate synchronously in opposite directions via the first gear ring 309 and the second gear, respectively.

[0041] The dust removal mechanism is located in the third transfer chamber, and the dust removal mechanism includes a dust removal box 401. The thickness of the dust removal box 401 is the same as the thickness of the assembly bracket 102. The two ends of the dust removal box 401 are open. The dust removal box 401 is located between the two high-pressure gas exhaust ports 112. The upper and lower ends of the dust removal box 401 are respectively connected to the second heat exchange chamber 104 and the first heat exchange chamber 103. A rotating drum 402 is rotatably connected between the two opposite surfaces of the dust removal box 401. The rotating drum 402 is arranged in a horizontal direction. A plurality of high-pressure air flow nozzles 403 are set on the outer circumference of the rotating drum 402. A high-pressure air inlet pipe 404 is fixedly connected to the outside of the dust removal box 401. The high-pressure air inlet pipe 404 is sealed and rotatably connected to the end of the rotating drum 402 extending outside the dust removal box 401. The high-pressure air inlet pipe 404 is externally connected to a high-pressure air generating device.

[0042] As a preferred solution of this embodiment, the dust removal mechanism includes a first motor 405 and a rocker arm 406. The output shaft of the first motor 405 is provided with a drive disk 407. A drive pin 408 is provided on the end face of the drive disk 407 away from the first motor 405. The drive pin 408 is eccentrically arranged. The rocker arm 406 is fixed to the end of the rotating drum 402 extending outside the dust removal box 401. A sliding hole 409 is provided on the rocker arm 406. The drive pin 408 is slidably set in the sliding hole 409. When the first motor 405 drives the drive disk 407 to rotate circumferentially, the eccentrically arranged drive pin 408 slides in the sliding hole 409, driving the rocker arm 406 and the rotating drum 402 to rotate circumferentially.

[0043] As another preferred solution of this embodiment, the dust removal mechanism includes a guide cone 410, which is a plurality of guide cones 410 fixedly connected to the drum 402. The plurality of guide cones 410 divide the drum 402 into a plurality of air flow distribution chambers 411. The tip of the guide cone 410 is arranged toward one side of the high-pressure air inlet pipe 404. A spiral blade 412 is provided on the outer surface of the guide cone 410. The drum 402 is a double-layer structure. The inner and outer layers of the drum 402 are hollow. A spiral air flow groove 413 is stamped on the inner wall of the drum 402. When the high-pressure gas passes through the spiral blade 412, it drives the guide cone 410 and the drum 402 fixedly connected to the guide cone 410 to rotate circumferentially. The spiral air flow groove 413 connects the two adjacent air flow distribution chambers 411. In this preferred embodiment, the guide cone 410 adopts a spiral groove design. When the high-pressure airflow is blown into the spiral blades 412, the direction of the airflow is guided by the spiral blades 412, giving the guide cone 410 rotational kinetic energy. The arrangement of multiple guide cones 410 drives the rotating drum 402 to rotate, and the airflow is discharged outward from the high-pressure airflow nozzles 403. It should be noted that within the rotating drum 402, the airflow velocity near the high-pressure air inlet pipe 404 is higher than the airflow velocity farther away from the high-pressure air inlet pipe 404. Preferably, the inner diameters of the exhaust ports of the multiple high-pressure airflow nozzles 403 increase in sequence in the direction away from the high-pressure air inlet pipe 404 to balance the exhaust volume of the multiple high-pressure airflow nozzles 403.

[0044] The working principle of the corrosion-resistant oil refining air preheater provided by the present invention is as follows:

[0045] When the air preheater needs to be used, the flue gas inlet pipe 113 and the flue gas outlet pipe 114 can be connected to the external flue pipe assembly through a pipeline, and the flue gas is sent into the heat exchange box 101 from bottom to top, and first exchanges heat with the heat exchange plates on the first heat exchange disk 202. The residual heat in the flue gas is then exchanged with the heat exchange plates on the second heat exchange disk 205. The temperature of the first heat exchange disk 202 is greater than that of the second heat exchange disk 205.

[0046] The output shaft of the second motor 302 rotates. When the second motor 302 drives the first rotating shaft 303 to rotate, the second rotating shaft 304 rotates synchronously with the first rotating shaft 303 in opposite directions through the meshing transmission of the first synchronous gear 305 and the second synchronous gear 307. The first driving gear 306 and the second driving gear 308 drive the first heat exchange disk 202 and the second heat exchange disk 205 to rotate synchronously in opposite directions through the first gear ring 309 and the second gear respectively. The heated heat exchange disk heats the air entering from the first air inlet pipe 108 and the second air inlet pipe 110, and the first air outlet pipe 109 and the second air outlet pipe 111 respectively collect and transport the preheated air.

[0047] When the first heat exchange disk 202 and the second heat exchange disk 205 rotate to the position of the dust removal box 401, compressed gas is introduced into the high-pressure air inlet pipe 404, and the air flow is ejected from the multiple high-pressure air flow nozzles 403 on the rotating drum 402 to remove the dust attached to the first heat exchange disk 202 and the second heat exchange disk 205.

[0048] When the rotating drum 402 is driven by the first motor 405, when the driving pin 408 rotates to the uppermost side, the end of the rocker arm 406 rotates counterclockwise thirty degrees around the central axis of the rotating drum 402. When the driving pin 408 rotates to the lowermost side, the end of the rocker arm 406 is forced to rotate clockwise thirty degrees around the central axis of the rotating drum 402. As the driving disk 407 continues to rotate, the rocker arm 406 rotates back and forth thirty degrees, thereby changing the jet direction of the high-pressure airflow nozzle 403. The first heat exchange disk 202 and the second heat exchange disk 205 will be blown by high-pressure gases at different angles, blowing off the attachments stuck on their surfaces.

[0049] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A corrosion-resistant air preheater for petroleum refining, comprising an equipment frame, a heat exchange mechanism, a drive mechanism, and a dust removal mechanism; characterized in that: A heat exchange box is fixedly connected in the equipment frame, and an assembly bracket is provided in the center of the heat exchange box, and the assembly bracket divides the internal space of the heat exchange box into a first heat exchange chamber at the bottom and a second heat exchange chamber at the top. A first assembly chamber, a second assembly chamber and a third assembly chamber located between the first assembly chamber and the second assembly chamber are arranged on one side of the assembly bracket. A first air inlet pipe is arranged in the first assembly chamber, and a first air outlet pipe is arranged at the bottom of the heat exchange box. The first air inlet pipe and the first air outlet pipe are both connected to the first heat exchange chamber, a second air inlet pipe is arranged in the second assembly chamber, and a second air outlet pipe is arranged on the top of the heat exchange box. The second air inlet pipe and the second outlet pipe are both connected to the second heat exchange chamber. The third assembly chamber is located inside the heat exchange box, and high-pressure gas exhaust ports connected to the third assembly chamber are arranged on the upper and lower end faces of the heat exchange box. A smoke inlet pipe is arranged at the lower end of the heat exchange box, and a smoke exhaust pipe is arranged at the upper end. A flue corresponding to the smoke inlet pipe and the smoke exhaust pipe is arranged on the assembly bracket.

2. The corrosion-resistant air preheater for petroleum refining according to claim 1, characterized in that: The heat exchange mechanism includes a first-level heat exchange component located in the first heat exchange chamber and a second-level heat exchange component located in the second heat exchange chamber. The first-level heat exchange component includes a first annular guide rail and a first heat exchange disk. The first annular guide rail is two fixed in the first heat exchange chamber. The outer side of the first heat exchange disk is fixedly connected with a first annular stop edge that is compatible with the two first annular guide rails, and the first annular guide rail slides with the first annular stop edge; the second-level heat exchange component includes a second annular guide rail and a second heat exchange disk. The second annular guide rail is two fixed in the second heat exchange chamber. The outer side of the second heat exchange disk is fixedly connected with a second annular stop edge that is compatible with the two second annular guide rails, and the second annular guide rail slides with the second annular stop edge.

3. The corrosion-resistant air preheater for petroleum refining according to claim 2, characterized in that: A first cover plate is provided on the upper end surface of the first heat exchange plate, and a second cover plate is provided on the lower end surface of the second heat exchange plate. The curvature of the first cover plate and the second cover plate is greater than 90°. When the first cover plate rotates and completely blocks the flue from the bottom, the second cover plate is separated from the top of the flue. When the second cover plate rotates and completely blocks the flue from the top, the first cover plate is separated from the flue.

4. The corrosion-resistant air preheater for petroleum refining according to claim 1, wherein the first cover plate and the second cover plate are provided with air flow holes.

5. The corrosion-resistant air preheater for petroleum refining according to claim 1, characterized in that: The driving mechanism includes a protective shell and a second motor. The protective shell is fixedly connected to the outside of the heat exchange box. A first rotating shaft and a second rotating shaft are arranged between the top of the protective shell and the lower edge of the heat exchange box. The first rotating shaft and the second rotating shaft are arranged in parallel. The first rotating shaft is coaxially fixed with a first synchronous gear and a first drive gear, and the second rotating shaft is coaxially fixed with a second synchronous gear and a second drive gear. The first synchronous gear and the second synchronous gear are meshed for transmission. The first drive gear and the second drive gear are both located in the protective shell. Avoidance holes corresponding to the first drive gear and the second drive gear are respectively provided on the heat exchange box. The outside of the first heat exchange disk is fixedly connected to a first gear ring meshed with the first drive gear, and the outside of the second heat exchange disk is fixedly connected to a second gear ring meshed with the second drive gear; the output shaft of the second motor is coaxially fixedly connected to the first rotating shaft.

6. The corrosion-resistant air preheater for petroleum refining according to claim 1 or 4, characterized in that: The dust removal mechanism is located in the third transfer chamber. The dust removal mechanism includes a dust removal box. The thickness of the dust removal box is the same as the thickness of the assembly bracket. The two ends of the dust removal box are open. The dust removal box is located between the two high-pressure gas exhaust ports. The upper and lower ends of the dust removal box are respectively connected to the second heat exchange chamber and the first heat exchange chamber. A rotating drum is rotatably connected between the two opposite surfaces of the dust removal box. The rotating drum is arranged in a horizontal direction. A plurality of high-pressure air flow nozzles are provided on the outer circumference of the rotating drum. A high-pressure air inlet pipe is fixedly connected to the outside of the dust removal box. The high-pressure air inlet pipe is sealed and rotatably connected to the end of the rotating drum extending out of the dust removal box.

7. The corrosion-resistant air preheater for petroleum refining according to claim 6, characterized in that: The dust removal mechanism also includes a first motor and a rocker arm. The output shaft of the first motor is provided with a drive disk. A drive pin is provided on the end face of the drive disk away from the first motor. The drive pin is eccentrically arranged. The rocker arm is fixed to the end of the rotating drum extending out of the dust removal box. A sliding hole is provided on the rocker arm. The drive pin is slidably arranged in the sliding hole. When the first motor drives the drive disk to rotate circumferentially, the eccentrically arranged drive pin slides in the sliding hole, driving the rocker arm and the rotating drum to rotate circumferentially.

8. The corrosion-resistant air preheater for petroleum refining according to claim 6, characterized in that: The dust removal mechanism also includes a guide cone, which is a plurality of guide cones fixedly connected to the rotating drum. The plurality of guide cones divide the rotating drum into multiple air flow distribution chambers. The tip of the guide cone is arranged toward one side of the high-pressure air intake pipe. The outer surface of the guide cone is provided with a spiral blade. The rotating drum has a double-layer structure. The inner and outer layers of the rotating drum are hollow. The inner wall of the rotating drum is stamped with a spiral air flow groove, which connects the two adjacent air flow distribution chambers.

9. The corrosion-resistant air preheater for petroleum refining according to claim 8, characterized in that: The inner diameters of the exhaust ports of the multiple high-pressure airflow nozzles increase in sequence in a direction away from the high-pressure air inlet pipe.

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