High-grade waste heat recovery device for high-temperature calcined petroleum coke

Abstract

The invention relates to a high-grade waste heat recovery device for high-temperature calcined petroleum coke. The waste heat recovery device comprises a mounting frame, a waste heat recovery furnace and a first cleaning mechanism, and an air inlet pipe, an air inlet bin, a heat exchange pipe, an air outlet bin and an air outlet pipe which are sequentially communicated in the hot air flowing direction are arranged in the heat recovery furnace; the first cleaning mechanism comprises a movable magnetic ring, a first driving mechanism and a magnetic cleaning scraping block; the first driving mechanism can drive the movable magnetic ring to move back and forth in the extending direction of the heat exchange pipe. The magnetic cleaning scraping block is attracted by the magnetic attraction force of the movable magnetic ring to move along with the movable magnetic ring, and the magnetic cleaning scraping block is located in the heat exchange pipe and abuts against the inner wall of the heat exchange pipe, so that the magnetic cleaning scraping block moves in the heat exchange pipe and can remove impurities in the pipeline from the heat exchange pipe through collision. And therefore, the influence of impurities in the pipeline on the heat transfer efficiency of the heat exchange pipe is avoided, and the high efficiency of waste heat recovery is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery from petroleum coke calcination, and in particular to a high-grade waste heat recovery device for high-temperature calcined petroleum coke. Background Art

[0002] During the calcination process of petroleum coke, especially in the pot calciner, a large amount of heat energy will be generated, which is mainly discharged in the form of high-temperature flue gas. These high-temperature flue gases have high sensible heat and are the main object of waste heat recovery. The flue gas temperature can usually reach 850℃-900℃, or even higher, which contains huge thermal energy potential. In the prior art, serpentine heat exchange tubes are usually used as heat exchangers inside the waste heat recovery boiler. After the flue gas enters the pipe, scale will accumulate on its inner wall, and scale will also form on the outer wall of the pipe as time goes by. It is not easy to clean the above substances. After long-term use, the heat exchange efficiency of the heat exchange tube will gradually decrease, resulting in serious heat loss and cannot meet actual production needs.

[0003] After searching, the patent publication number is: CN116412536B, which discloses a horizontal waste heat recovery boiler that can transfer the heat of the flue gas to the heat exchange unit to heat the water in the water storage chamber, that is, to achieve heat exchange between the flue gas and the water. The multi-prism and the combination rod drive the rotary chuck and the heat exchange unit to rotate, so as to stir and tumble the water in the water storage chamber, thereby improving the fluidity of the water and the uniformity of the water temperature. The linkage mechanism realizes the translation of the scraper to clean the scale on the outer wall of the flue pipe, making it easy to discharge the scale. The heat transfer pipe of the heat exchange unit is embedded in the flue pipe to prevent the escape of flue gas, and it is also convenient to remove and clean internal impurities, thereby ensuring heat exchange efficiency and reducing heat loss.

[0004] However, the dust particles and sulfide components carried by the flue gas produced by high-temperature calcined petroleum coke in the patent are easy to adhere to the inner wall of the flue pipe to form an impurity layer. Over time, the impurity layer will continue to thicken, which will not only affect the heat transfer efficiency of the flue pipe and reduce the waste heat recovery effect, but may also gradually block the flue pipe, resulting in poor flue gas circulation and affecting the operational stability of the entire system. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a high-grade waste heat recovery device for high-temperature calcined petroleum coke, which can clean the inner wall of the heat exchange tube to avoid impurities carried by the flue gas affecting the heat transfer efficiency of the heat exchange tube, thereby ensuring the high efficiency of waste heat recovery.

[0006] The purpose of the present invention is achieved by the following scheme:

[0007] A high-grade waste heat recovery device for high-temperature calcined petroleum coke, comprising:

[0008] Rack mounting;

[0009] A waste heat recovery furnace, wherein the waste heat recovery furnace is installed on the installation frame, and an air inlet pipe, an air inlet bin, a heat exchange pipe, an air outlet bin and an air outlet pipe are sequentially connected along the hot gas flow direction. The waste heat recovery furnace is also provided with an inlet pipe, a heat exchange bin and an outlet pipe, wherein the heat exchange bin is arranged around the periphery of the heat exchange pipe, and an accumulator heat exchange cavity is formed between the inner bin wall of the heat exchange bin and the heat exchange pipe, and the inlet pipe, the accumulator heat exchange cavity and the outlet pipe are sequentially connected;

[0010] The first cleaning mechanism comprises a movable magnetic ring, a first driving mechanism and a magnetic cleaning scraper; the movable magnetic ring is movably arranged around the periphery of the heat exchange tube, the first driving mechanism can drive the movable magnetic ring to move back and forth along the extension direction of the heat exchange tube; the magnetic cleaning scraper is attracted by the magnetic attraction of the movable magnetic ring and can move with the movable magnetic ring, the magnetic cleaning scraper is located in the heat exchange tube and abuts against the inner wall of the heat exchange tube.

[0011] In one embodiment, the heat exchange tube comprises a first heat preservation area, an air inlet area, a heat exchange area and an air outlet area which are connected in sequence, the heat preservation area and the air inlet area are located in the air inlet bin, an air inlet is opened on the heat exchange tube, the air inlet is arranged in the air inlet area, the air inlet bin is surrounded by a second heat preservation area, the movable magnetic ring can slide into the second heat preservation area to attract the magnetic cleaning scraper to slide into the first heat preservation area;

[0012] The magnetic cleaning scraper comprises a first heat-insulating layer and a first magnet, wherein a first magnetic pole of the first magnet, a second magnetic pole of the first magnet and the first heat-insulating layer are arranged in sequence along a moving direction of flue gas in the heat exchange tube.

[0013] In one embodiment, a first scraper is embedded in the periphery of the first thermal insulation layer, and the first scraper abuts against the inner wall of the heat exchange tube.

[0014] In one embodiment, the movable magnetic ring includes a second insulation layer and a second magnet, the first pole of the second magnet, the second pole of the second magnet and the second insulation layer are arranged in sequence along the movement direction of the flue gas in the heat exchange tube, the second magnet is used to attract the first magnet so that the first magnet moves with the movement of the second magnet, and the first driving mechanism is used to drive the movable magnetic ring to move from the second insulation area to the junction of the heat exchange bin and the air outlet bin, thereby driving the magnetic cleaning scraper to pass through the first insulation area, the air intake area, and the heat exchange area in sequence to reach the junction of the heat exchange area and the air outlet area.

[0015] In one embodiment, the heat exchange tube includes a central circular flow channel and flared sections symmetrically distributed on both sides, and the magnetic cleaning scraper includes a cylindrical block matching the heat exchange tube and flanges symmetrically distributed on both sides.

[0016] In one embodiment, the first driving mechanism includes a conveying dragon, a roller, a driving motor, a first slider and a second slider;

[0017] The waste heat recovery furnace is provided with a C-shaped conveying cylinder, the conveying dragon is arranged in the C-shaped conveying cylinder, the roller and the conveying dragon are coaxially arranged and connected to each other, the output end of the driving motor is connected to the roller driving, the conveying blade of the conveying dragon is provided with a first thread section, the first slider is slidably connected to the first thread section, the first slider is installed on the movable magnetic ring, the inner wall of the heat exchange chamber is provided with a slide groove, the second slider is slidably connected to the slide groove, and the second slider is installed on the movable magnetic ring.

[0018] In one of the embodiments, the waste heat recovery device further comprises a second cleaning mechanism, wherein the second cleaning mechanism comprises a cleaning scraper and a second driving mechanism;

[0019] The cleaning scraper is provided with an avoidance hole, and the cleaning scraper is passed through the avoidance hole and is arranged on the heat exchange tube. The inner wall of the avoidance hole abuts against the heat exchange tube, and the second driving mechanism is used for driving the cleaning scraper to move along the extension direction of the heat exchange tube.

[0020] In one embodiment, the second driving mechanism includes a rotating shaft, a third slider, an active driving wheel, a synchronous belt and a driven driving wheel;

[0021] The rotating shaft is arranged on the waste heat recovery furnace, a second thread segment is opened on the rotating shaft, the third slider is slidably connected with the second thread segment, the third slider is installed on the cleaning scraper, the rotating shaft is drivingly connected with the active driving wheel, the output end of the driving motor is drivingly connected with the active driving wheel, the active driving wheel is wound around the synchronous belt, the synchronous belt is wound around the driven driving wheel, and the driven driving wheel is drivingly connected with the roller.

[0022] In one of the embodiments, an overflow hole is provided on the cleaning scraper, and a second scraper is embedded in the avoidance hole, and the second scraper is used to abut against the outer wall of the heat exchange tube.

[0023] In one embodiment, the waste heat recovery device further includes a flow storage furnace, the flow storage furnace is installed on the mounting frame, the flow storage furnace is connected to the waste heat recovery furnace through the inlet pipe and the outlet pipe, a water pump is provided in the circulation furnace, and the water pump is used to drive the heat transfer fluid to pass through the inlet pipe, the flow storage heat exchange cavity and return to the flow storage furnace from the outlet pipe;

[0024] A temperature sensor is provided in the gas outlet bin, and the temperature sensor is used to monitor the temperature of the smoke passing through the gas outlet bin in real time;

[0025] The outlet pipe is provided with a flow control valve, and the flow control valve is used to control the speed at which the heat transfer fluid flows out of the flow storage heat exchange cavity.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The movable magnetic ring of the first cleaning mechanism and the first driving mechanism move back and forth along the extension direction of the heat exchange tube under the action of magnetic attraction, so that the magnetic cleaning scraper in the heat exchange tube can continue to work in the heat exchange tube. With the movement of the movable magnetic ring, the cleaning scraper forms a dynamic scraping interface on the inner wall of the heat exchange tube, and the front end strongly collides with the impurity layer of the tube wall, effectively stripping the impurities, effectively improving the cleaning efficiency and cleaning effect;

[0028] 2. By respectively setting the first insulation area and the second insulation area in the air inlet bin and the accumulator heat exchange chamber, as well as the first insulation layer and the second insulation layer on the magnetic cleaning scraper and the movable magnetic ring, the magnetic cleaning scraper and the movable magnetic ring can isolate the influence of high temperature on the first magnet and the second magnet during the working time of the waste heat recovery furnace, avoid the high temperature demagnetization phenomenon, and ensure the normal cleaning work;

[0029] 3. Through the directional magnetic coupling effect of the first magnet in the magnetic cleaning scraper, the traction driving force between the magnetic cleaning scraper and the movable magnetic ring is strengthened, so that the traction driving force is transmitted more smoothly during the cleaning operation of the inner wall of the heat exchange tube, and the impact strength of the cleaning scraper is improved when impurities are stripped;

[0030] 4. The outer wall of the heat exchange tube is cleaned by the second cleaning mechanism. The cleaning scraper moves under the drive of the second driving mechanism to clean various impurities attached to the outer side of the heat exchange tube, such as scale generated by the heat transfer fluid, and effectively maintain the cleanliness of the outer wall of the heat exchange tube, thereby improving the heat exchange efficiency of the heat exchange tube, thereby ensuring the efficient and stable operation of the waste heat recovery device and improving the waste heat recovery efficiency;

[0031] 5. Through the closed-loop linkage control of the temperature sensor in the gas outlet bin, the flow control valve and the water pump, the flue gas temperature is monitored in real time and the circulation flow of the heat transfer fluid is dynamically adjusted to achieve adaptive adjustment of the heat exchange intensity. When the flue gas temperature rises abnormally, the flow control valve opening increases and the water pump speed increases to accelerate the circulation of the heat transfer fluid to enhance the heat exchange efficiency; conversely, when the temperature approaches the critical lower limit, the flow control valve throttling speed limit and the water pump frequency reduction cooperate to suppress excessive heat release, which can not only avoid the over-temperature failure of subsequent process equipment caused by excessively high flue gas temperature, but also prevent the condensation corrosion of sulfide substances caused by too low temperature, ensure the stable operation of the waste heat recovery system within the full range of operating conditions, and effectively improve the service life of the waste heat recovery equipment and the effective implementation of the flue gas treatment process.

[0032] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a high-grade waste heat recovery device for high-temperature calcined petroleum coke provided in an embodiment of the present application, wherein a portion of the furnace wall of the waste heat recovery furnace is hidden;

[0034] Figure 2 for Figure 1 The structural schematic diagram of the high-grade waste heat recovery device for high-temperature calcined petroleum coke from another perspective is shown;

[0035] Figure 3 for Figure 2 The schematic diagram of the structure of the high-grade waste heat recovery device for high-temperature calcined petroleum coke after hiding the furnace wall, gas outlet bin and gas outlet pipe shown;

[0036] Figure 4a : is a working principle diagram of the first cleaning mechanism and the second cleaning mechanism of the embodiment of the present application, wherein the figure is a cross-sectional view of the waste heat recovery furnace when cleaning a heat exchange tube, wherein the dotted line I is the boundary line between the first heat preservation area and the air intake area, and the dotted line II is the boundary line between the air intake area and the heat exchange area;

[0037] Figure 4b for Figure 1 A schematic cross-sectional view of a heat exchange tube is shown;

[0038] Figure 4c for Figure 3 The cross-sectional view of the high-grade waste heat recovery device for high-temperature calcined petroleum coke is shown, wherein the heat exchange tubes are hidden;

[0039] Figure 5a A schematic structural diagram of a high-grade waste heat recovery device for high-temperature calcined petroleum coke provided in another embodiment of the present application;

[0040] Figure 5b for Figure 5aThe structural schematic diagram of the high-grade waste heat recovery device for high-temperature calcined petroleum coke from another perspective is shown;

[0041] In the figure, 100, mounting frame; 200, waste heat recovery furnace; 210, air inlet pipe; 220, air inlet bin; 230, heat exchange pipe; 231, first insulation area; 232, air inlet area; 233, heat exchange area; 234, air outlet area; 235, air inlet; 236, circular flow channel; 237, expansion section; 240, air outlet bin; 250, air outlet pipe; 261, inlet pipe; 262, outlet pipe; 270, heat exchange bin; 271, second insulation area; 272, chute; 280, flow storage heat exchange cavity; 290, C-shaped conveying cylinder; 300, first cleaning mechanism; 310, movable magnetic ring; 311, second insulation layer; 312, second magnet; 3 20. First driving mechanism; 321. Conveying dragon; 322. Roller; 323. Driving motor; 324. First slider; 325. Second slider; 326. First threaded section; 330. Magnetic cleaning scraper; 331. First insulation layer; 332. First magnet; 333. First scraper; 400. Second cleaning mechanism; 410. Cleaning scraper; 411. Avoidance hole; 412. Overflow hole; 413. Second scraper; 420. Second driving mechanism; 421. Rotating shaft; 422. Third slider; 423. Active driving wheel; 424. Synchronous belt; 425. Driven driving wheel; 426. Second threaded section; 500. Accumulator; 510. Flow control valve. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the invention more thorough and comprehensive.

[0043] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "parallel", "first", "second", "third" and similar expressions used herein are for illustrative purposes only.

[0044] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0045] See also Figure 1-Figure 3 , which shows a structural schematic diagram of a high-grade waste heat recovery device for high-temperature calcined petroleum coke provided in an embodiment of the present application, wherein the waste heat recovery device includes a mounting frame 100, a waste heat recovery furnace 200 and a first cleaning mechanism 300.

[0046] Specifically, the waste heat recovery furnace 200 is installed on the mounting frame 100, and the waste heat recovery furnace 200 is provided with an air inlet pipe 210, an air inlet bin 220, a heat exchange pipe 230, an air outlet bin 240 and an air outlet pipe 250 which are connected in sequence along the hot gas flow direction; wherein, the air inlet bin 220 and the air outlet bin 240 are respectively connected to the two ends of the heat exchange pipe 230 through flange sealing, so that the heat exchange pipe 230 is connected to form a closed flue gas channel. Specifically, after the high-temperature flue gas is axially introduced from the air inlet pipe 210, turbulent pressure equalization is first completed in the air inlet bin 220, and then enters a plurality of groups of parallel arranged heat exchange pipes 230. During the flow of the heat exchange pipes 230, physical contact and heat exchange occur with the heat transfer fluid outside the exchange pipes, and finally, the flue gas is collected through the air outlet bin 240 and discharged from the waste heat recovery furnace 200 through the air outlet pipe 250 to carry out the gas treatment process.

[0047] The waste heat recovery furnace 200 is also provided with an inlet pipe 261, a heat exchange chamber 270 and an outlet pipe 262. The heat exchange chamber 270 is arranged around the periphery of the heat exchange tube 230. A storage heat exchange chamber 280 is formed between the inner chamber wall of the heat exchange chamber 270 and the heat exchange tube 230. The inlet pipe 261, the storage heat exchange chamber 280 and the outlet pipe 262 are connected in sequence. Specifically, the low-temperature heat transfer fluid is continuously injected into the storage heat exchange chamber 280 through the inlet pipe 261, and the storage heat exchange chamber 280 continuously absorbs the heat from the outer wall of the heat exchange tube 230 and then heats up. Finally, it leaves the waste heat recovery furnace 200 through the outlet pipe 262 to be used by heat-using equipment. Preferably, a finned tube structure can be adopted on the heat exchange tube 230 to increase the heat exchange area, and a stirring device can be provided in the heat storage heat exchange chamber to make the heat transfer fluid generate turbulence, thereby increasing the heat exchange efficiency between the heat transfer fluid and the heat exchange tube 230.

[0048] The first cleaning device includes a movable magnetic ring 310, a first driving mechanism 320 and a magnetic cleaning scraper 330; the movable magnetic ring 310 is movably arranged around the periphery of the heat exchange tube 230, and the first driving mechanism 320 can drive the movable magnetic ring 310 to move back and forth along the extension direction of the heat exchange tube 230; the magnetic cleaning scraper 330 is attracted by the magnetic attraction force of the movable magnetic ring 310 and can move with the movable magnetic ring 310, and the magnetic cleaning scraper 330 is located in the heat exchange tube 230 and abuts against the inner wall of the heat exchange tube 230.

[0049] Specifically, under the action of magnetic attraction, the movable magnetic ring 310 and the first driving mechanism 320 reciprocate along the extension direction of the heat exchange tube 230, so that the magnetic cleaning scraper 330 can continue to work in the heat exchange tube 230. With the movement of the movable magnetic ring 310, the magnetic cleaning scraper 330 forms a dynamic scraping interface on the inner wall of the heat exchange tube 230, and the front end strongly collides with the impurity layer of the tube wall, effectively stripping the impurities, effectively improving the cleaning efficiency and cleaning effect. The stripped impurities accumulate in the magnetic cleaning scraper 330 and are pushed away from the inner wall of the heat exchange tube 230 as it moves, ensuring the long-term cleaning of the heat exchange tube 230 and avoiding the accumulation of the impurity layer that affects the heat exchange efficiency of the heat exchange tube 230. The first cleaning device can replace manual cleaning of the heat exchange inner wall, avoiding the tedious steps of removing the heat exchange tube 230 for cleaning, effectively reducing the maintenance cost of the waste heat recovery device, and compared with traditional cleaning methods, the cleaning process of the heat exchange tube 230 can be completed in a shorter time, so that the waste heat recovery device can be put into operation faster.

[0050] Preferably, taking one of the heat exchange tubes 230 in the waste heat recovery device as an example, Figure 4a As shown, the heat exchange tube 230 includes a first insulation area 231, an air inlet area 232, a heat exchange area 233 and an air outlet area 234 which are connected in sequence. The insulation area and the air inlet area 232 are located in the air inlet bin 220. An air inlet port 235 is opened on the heat exchange tube 230. The air inlet port 235 is arranged in the air inlet area 232. The air inlet bin 220 is surrounded by a second insulation area 271. The movable magnetic ring 310 can slide into the second insulation area 271. At this time, the directional magnetic field generated by it penetrates the double-layer insulation structure to attract the magnetic cleaning scraper 330 to slide into the first insulation area 231 synchronously.

[0051] Preferably, the magnetic cleaning scraper 330 includes a first insulation layer 331 and a first magnet 332, wherein the first magnetic pole (N pole) of the first magnet 332, the second magnetic pole (S pole) of the first magnet 332 and the first insulation layer 331 are arranged in sequence along the direction of movement of the flue gas in the heat exchange tube 230. The traction driving force between the magnetic cleaning scraper 330 and the movable magnetic ring 310 is enhanced by the directional magnetic attraction coupling effect of the first magnet 332 in the magnetic cleaning scraper 330, so that the traction driving force is transmitted more smoothly during the cleaning operation of the inner wall of the heat exchange tube 230, and the impact strength of the cleaning scraper is improved during the impurity stripping operation; the first insulation layer 331 is preferably made of silicon nitride ceramic fiber, and the first insulation layer 331 completely covers the side of the first magnet 332 that is not facing the working direction. When the first cleaning mechanism 300 enters a stop or standby state, the magnetic cleaning scraper 330 is completely retracted into the first insulation area 231 by the magnetic force. At this time, the first insulation layer 331 isolates the heat of the flue gas inside the heat exchange tube 230, preventing the first magnet 332 from being in a high temperature environment, and effectively preventing the magnetic force of the first magnet 332 from being attenuated due to high temperature, thereby ensuring the stability of the magnetic attraction driving force of the magnetic cleaning scraper 330 under long-term high temperature conditions.

[0052] Preferably, a first scraper 333 is embedded in the periphery of the first thermal insulation layer 331, and the magnetic cleaning scraper 330 abuts against the inner wall of the heat exchange tube 230 through the first scraper 333. On the one hand, the embedded first scraper 333 can increase the fit between the magnetic scraper and the inner wall of the heat exchange tube 230, thereby more thoroughly removing the impurities attached to the inner wall of the pipe, effectively improving the cleaning effect. On the other hand, compared with direct contact, the first scraper 333 acts as a buffer medium, reducing the direct wear of the cleaning scraper on the inner wall of the heat exchange tube 230, extending the service life of the heat exchange tube 230, and reducing the equipment loss cost. Furthermore, from the maintenance perspective, if the first scraper 333 is worn, only the relatively small first scraper 333 needs to be replaced, and there is no need to disassemble and replace the entire magnetic cleaning scraper 330, thereby reducing the maintenance cost.

[0053] The movable magnetic ring 310 includes a second thermal insulation layer 311 and a second magnet 312. The first magnetic pole (N pole) of the second magnet 312, the second magnetic pole (S pole) of the second magnet 312, and the second thermal insulation layer 311 are arranged in sequence along the movement direction of the flue gas in the heat exchange tube 230. The second magnet 312 is used to attract the first magnet 332 so that the first magnet 332 moves with the movement of the second magnet 312.

[0054] Specifically, when the movable magnetic ring 310 is driven by the first driving mechanism 320 to move toward the heat exchange area 233, the N pole of its second magnet 312 approaches the S pole of the first magnet 332 of the magnetic cleaning scraper 330, forming a closed magnetic circuit of heteropolar attraction; at the same time, the S pole of the second magnet 312 and the N pole of the first magnet 332 generate a repulsive force due to the same-direction magnetic pole arrangement, and the two forces are superimposed to form a unidirectional driving force, forcing the magnetic cleaning scraper 330 to move forward synchronously with the movable magnetic ring 310. When the movable magnetic ring 310 is reset in the reverse direction, the S pole of the second magnet 312 and the N pole of the first magnet 332 are converted into a heteropolar attraction state, while the N pole of the second magnet 312 and the S pole of the first magnet 332 form a homopolar repulsion, and the direction of the magnetic attraction force is reversed at this time, driving the magnetic cleaning scraper 330 to slide in the reverse direction along the inner wall of the heat exchange tube 230 to the initial position. The N / S pole alternating attraction-repulsion mechanism ensures that the magnetic cleaning scraper 330 always keeps synchronous displacement with the movable magnetic ring 310 during the round trip. Therefore, when the first driving mechanism 320 drives the movable magnetic ring 310 to move from the second heat preservation area 271 to the junction of the heat exchange chamber 270 and the air outlet chamber 240, the magnetic cleaning scraper 330 moves in the heat exchange tube 230 through the first heat preservation area 231, the air inlet area 232, and the heat exchange area 233 to the junction of the heat exchange area 233 and the air outlet area 234.

[0055] Preferably, the second thermal insulation layer 311 is made of silicon nitride ceramic fiber. When the movable magnetic ring 310 slides into the second thermal insulation area 271, the second thermal insulation layer 311 isolates the heat dissipated by the heat-conducting fluid inside the fluid storage heat exchange chamber 280, thereby preventing the second magnet 312 from being in a high temperature environment, and effectively preventing the magnetic force of the second magnet 312 from being attenuated due to high temperature, thereby ensuring the stability of the magnetic attraction driving force of the movable magnetic ring 310 in the fluid storage heat exchange chamber 280.

[0056] See also Figure 4b In one embodiment, the heat exchange tube 230 includes a circular flow channel 236 in the middle and a flared section 237 symmetrically distributed on both sides, and the magnetic cleaning scraper 330 includes a cylindrical block matching the heat exchange tube 230 and flanges symmetrically distributed on both sides. Specifically, the heat exchange tube 230 forms a two-way mechanical limit for the movement trajectory of the magnetic cleaning scraper 330 through the inner wall of the flared section 237 and the curved surface of the flanges on both sides of the magnetic cleaning scraper 330; when the magnetic cleaning scraper 330 is pulled and moved by the magnetic attraction force, its flange slides along the inclined surface of the flared section 237, thereby effectively suppressing the axial displacement of the magnetic cleaning scraper 330 under the action of gas turbulence in the pipeline. At the same time, through the transition structure of the flared section 237 and the circular flow channel 236, the airflow disturbance of the high-temperature flue gas in the heat exchange tube 230 can be enhanced, thereby improving the heat exchange efficiency, and significantly improving the waste heat recovery efficiency of the waste heat recovery device.

[0057] like Figure 4c As shown, the first driving mechanism 320 includes a conveying dragon 321, a roller 322, a driving motor 323, a first slider 324 and a second slider 325;

[0058] The waste heat recovery furnace 200 is provided with a C-shaped conveying cylinder 290, a conveying dragon 321 is arranged in the C-shaped conveying cylinder 290, a roller 322 is coaxially arranged with the conveying dragon 321 and connected to each other, an output end of the driving motor 323 is drivingly connected to the roller 322, a first threaded section 326 is provided on the conveying blade of the conveying dragon 321, a first slider 324 is slidably connected to the first threaded section 326, the first slider 324 is installed on the movable magnetic ring 310, a slide groove 272 is provided on the inner wall of the heat exchange chamber 270, a second slider 325 is slidably connected to the slide groove 272, and the second slider 325 is installed on the movable magnetic ring 310.

[0059] Specifically, after the driving motor 323 is started, the driving roller 322 rotates, driving the conveying dragon 321 coaxially fixed therewith to rotate circumferentially in the C-shaped conveying cylinder 290. On the one hand, the first threaded section 326 on the conveying blade of the conveying dragon 321 forms a spiral pair with the first slider 324 during the rotation process, converting the rotational motion of the conveying dragon 321 into a linear displacement of the first slider 324 along the axis of the C-shaped conveying cylinder 290, thereby pushing the movable magnetic ring 310 to move synchronously; at the same time, the first threaded section 326 installed on the movable magnetic ring 310 The second slider 325 on the upper part and the slide groove 272 on the inner wall of the heat exchange chamber 270 form a sliding guide pair. The linear constraint of the slide groove 272 eliminates the circumferential degree of freedom deviation caused by the rotation of the conveying dragon 321, ensuring that the movable magnetic ring 310 moves back and forth smoothly along the set trajectory; on the other hand, the conveying blades stir the heat transfer fluid in the storage heat exchange chamber 280, promote the full mixing of the fluid in the high temperature area and the low temperature area, eliminate the local temperature gradient, and significantly improve the contact frequency between the heat transfer fluid and the outer wall of the heat exchange tube 230 and the uniformity of heat exchange. It can be understood that the first driving mechanism 320 can also be a push rod mechanism, and a push rod block is provided on the output end of the push rod motor. The push rod block is connected to the movable magnetic ring 310 to drive the movable magnetic ring 310 to move with the movement of the push rod block. When the push rod block moves in the storage heat exchange chamber 280, it can also play a stirring role to increase the contact frequency between the heat transfer fluid and the outer wall of the heat exchange.

[0060] like Figure 4a , Figure 4c As shown, the high-grade waste heat recovery device for high-temperature calcined petroleum coke provided in the present application further includes a second cleaning mechanism 400 , wherein the second cleaning mechanism 400 includes a cleaning scraper 410 and a second driving mechanism 420 .

[0061] The cleaning scraper 410 is provided with an avoidance hole 411, through which the cleaning scraper 410 is passed through the heat exchange tube 230, and the inner wall of the avoidance hole 411 abuts against the heat exchange tube 230. The second driving mechanism 420 is used to drive the cleaning scraper 410 to move along the extension direction of the heat exchange tube 230.

[0062] Specifically, during the waste heat recovery process, some components of the heat transfer fluid will also adhere to the outer wall of the heat exchange tube 230, affecting the heat exchange efficiency with the heat exchange tube 230. For example, when the heat transfer fluid is water, during the long-term heat exchange process, scale will adhere to the outer wall of the heat exchange tube 230. At this time, the scale will hinder the heat exchange process, thereby gradually reducing the heat exchange efficiency of the heat exchange tube 230; the cleaning scraper 410 moves under the drive of the second driving mechanism 420, and can clean up various impurities attached to the outside of the heat exchange tube 230, such as scale generated by the heat transfer fluid, and effectively maintain the cleanliness of the outer wall of the heat exchange tube 230, thereby improving the heat exchange efficiency of the heat exchange tube 230, thereby ensuring the efficient and stable operation of the waste heat recovery device and improving the waste heat recovery efficiency.

[0063] Preferably, the second driving mechanism 420 includes a rotating shaft 421, a third slider 422, an active driving wheel 423, a synchronous belt 424 and a driven driving wheel 425;

[0064] The rotating shaft 421 is arranged in the waste heat recovery furnace 200, and a second threaded section 426 is opened on the rotating shaft 421. The third slider 422 is slidably connected to the second threaded section 426. The third slider 422 is installed on the cleaning scraper 410. The rotating shaft 421 is drivingly connected to the active driving wheel 423. The output end of the driving motor 323 is drivingly connected to the active driving wheel 423. The active driving wheel 423 is wound around the synchronous belt 424. The synchronous belt 424 is wound around the driven driving wheel 425. The driven driving wheel 425 is drivingly connected to the roller 322. Among them, the driving motor 323 drives the active driving wheel 423 to rotate through the output shaft, and the synchronous belt 424 transmits power to the driven driving wheel 425, thereby driving the roller 322 to rotate synchronously with the rotating shaft 421; the second threaded segment 426 of the rotating shaft 421 and the third slider 422 form a spiral pair, which converts the rotational motion of the rotating shaft 421 into a linear displacement of the third slider 422 along the axial direction of the heat exchange tube 230, thereby driving the cleaning scraper 410 to move; at the same time, the roller 322 drives the first slider 324 through the conveying dragon 321 to push the movable magnetic ring 310 to move. In this linkage mechanism, a single drive motor 323 drives the first drive mechanism 320 and the second drive mechanism 420 simultaneously through a synchronous belt 424 to achieve synchronous cleaning of the inner and outer walls of the heat exchange tube 230 - when the active drive wheel 423 rotates forward, the movable magnetic ring 310 and the cleaning scraper 410 move in the same direction along the inner and outer walls of the heat exchange tube 230 to clean dirt; when reversed, the two are reset in the opposite direction, and the tension adjustment mechanism of the synchronous belt 424 ensures that the bidirectional driving torque is balanced to avoid transmission slippage caused by load differences. Preferably, the first drive mechanism 320 and the second drive mechanism 420 can be independent drive mechanisms, so that different cleaning cycles of the inner and outer walls of the heat exchange tube 230 can be set according to actual conditions, thereby improving the flexibility of equipment cleaning.

[0065] Preferably, an overflow hole 412 is provided on the cleaning scraper 410 to reduce the resistance of the heat transfer fluid during movement. At the same time, in order to reduce the replacement cost of the cleaning scraper 410, a second scraper 413 is embedded in the avoidance hole 411. The second scraper 413 abuts against the outer wall of the heat exchange tube 230 instead of the cleaning scraper 410 directly contacting the outer wall of the heat exchange tube 230, thereby avoiding the wear of the cleaning scraper 410. When replacing, only the second scraper 413 needs to be replaced accordingly to complete the update of the cleaning equipment, thereby reducing the cost of equipment maintenance.

[0066] During the operation of the waste heat recovery device, the final temperature of the flue gas entering the gas outlet bin 240 after heat exchange through the heat exchange tube 230 needs to be accurately controlled: if the flue gas temperature is too high, the subsequent gas purification process will fail; and if the temperature is lower than the sulfide substances (such as SO 3) dew point temperature (120-160℃ under typical working conditions), it is easy to cause sulfuric acid condensate to precipitate on the inner wall of the equipment, causing low-temperature dew point corrosion of the metal pipe. Therefore, the waste heat recovery equipment should keep the outlet temperature stable and controlled within the safe operating range, so as to ensure the processing efficiency of subsequent processes and avoid the risk of erosion of the heat exchange tube 230 and the outlet bin 240 structure by corrosive media.

[0067] like Figure 5a and Figure 5b As shown, in another embodiment of the present application, a high-grade waste heat recovery device for high-temperature calcined petroleum coke further includes a storage furnace 500, which is installed on a mounting frame 100. The storage furnace 500 is connected to the waste heat recovery furnace 200 through an inlet pipe 261 and an outlet pipe 262. A water pump is provided in the circulation furnace, which is used to drive the heat transfer fluid to pass through the inlet pipe 261, the storage heat exchange chamber 280 and return to the storage furnace 500 from the outlet pipe 262; a temperature sensor is provided in the gas outlet bin 240, which is used to monitor the temperature of the flue gas passing through the gas outlet bin 240 in real time; a flow control valve 510 is provided on the outlet pipe 262, which is used to control the speed at which the heat transfer fluid flows out of the storage heat exchange chamber 280.

[0068] Specifically, the high-grade waste heat recovery device for high-temperature calcined petroleum coke provided by the present application monitors the flue gas temperature in real time and dynamically adjusts the circulation flow of the heat transfer fluid through the closed-loop linkage control of the temperature sensor in the gas outlet bin 240, the flow control valve 510, and the water pump, so as to realize the adaptive adjustment of the heat exchange intensity. When the flue gas temperature rises abnormally, the flow control valve 510 increases in opening and cooperates with the water pump speed increase to accelerate the circulation of the heat transfer fluid to enhance the heat exchange efficiency; on the contrary, when the temperature approaches the critical lower limit, the flow control valve 510 throttles and limits the speed and the water pump frequency decreases to suppress excessive heat release, which can not only avoid the over-temperature failure of subsequent process equipment caused by excessively high flue gas temperature, but also prevent the condensation corrosion of sulfide substances caused by too low temperature, ensure the stable operation of the waste heat recovery system within the full range of working conditions, and effectively improve the service life of the waste heat recovery equipment and the effective implementation of the flue gas treatment process.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A high-grade waste heat recovery device for high-temperature calcined petroleum coke, characterized in that: include: Mounting frame (100); A waste heat recovery furnace (200), the waste heat recovery furnace (200) being mounted on the mounting frame (100), the waste heat recovery furnace (200) being provided with an air inlet pipe (210), an air inlet bin (220), a heat exchange pipe (230), an air outlet bin (240) and an air outlet pipe (250) which are sequentially connected along the hot gas flow direction; the waste heat recovery furnace (200) is further provided with an inlet pipe (261), a heat exchange bin (270) and an outlet pipe (262), the heat exchange bin (270) being arranged around the periphery of the heat exchange pipe (230), an accumulator heat exchange chamber (280) being formed between the inner bin wall of the heat exchange bin (270) and the heat exchange pipe (230), the inlet pipe (261), the accumulator heat exchange chamber (280) and the outlet pipe (262) being sequentially connected; A first cleaning mechanism (300), the first cleaning mechanism (300) comprising a movable magnetic ring (310), a first driving mechanism (320) and a magnetic cleaning scraper (330); the movable magnetic ring (310) is movably arranged around the periphery of the heat exchange tube (230), the first driving mechanism (320) can drive the movable magnetic ring (310) to move back and forth along the extension direction of the heat exchange tube (230); the magnetic cleaning scraper (330) is attracted by the magnetic attraction of the movable magnetic ring (310) and can move following the movable magnetic ring (310), the magnetic cleaning scraper (330) is located in the heat exchange tube (230) and abuts against the inner wall of the heat exchange tube (230).

2. The waste heat recovery device according to claim 1, characterized in that: The heat exchange tube (230) comprises a first heat preservation area (231), an air inlet area (232), a heat exchange area (233) and an air outlet area (234) which are connected in sequence; the first heat preservation area (231) and the air inlet area (232) are located in the air inlet bin (220); an air inlet (235) is provided on the heat exchange tube (230); the air inlet (235) is located in the air inlet area (232); the air inlet bin (220) is surrounded by a second heat preservation area (271); the movable magnetic ring (310) can slide into the second heat preservation area (271) to attract the magnetic cleaning scraper (330) to slide into the first heat preservation area (231); The magnetic cleaning scraper (330) comprises a first thermal insulation layer (331) and a first magnet (332), wherein a first magnetic pole of the first magnet (332), a second magnetic pole of the first magnet (332) and the first thermal insulation layer (331) are arranged in sequence along a movement direction of the flue gas in the heat exchange tube (230).

3. The waste heat recovery device according to claim 2, characterized in that: A first scraper (333) is embedded in the periphery of the first thermal insulation layer (331), and the first scraper (333) abuts against the inner wall of the heat exchange tube (230).

4. The waste heat recovery device according to claim 2, characterized in that: The movable magnetic ring (310) comprises a second thermal insulation layer (311) and a second magnet (312); a first magnetic pole of the second magnet (312), a second magnetic pole of the second magnet (312) and the second thermal insulation layer (311) are arranged in sequence along the movement direction of the flue gas in the heat exchange tube (230); the second magnet (312) is used to attract the first magnet (332) so that the first magnet (332) moves along with the movement of the second magnet (312); the first driving mechanism (320) is used to drive the movable magnetic ring (310) to move from the second thermal insulation area (271) to the junction of the heat exchange chamber (270) and the air outlet chamber (240), thereby driving the magnetic cleaning scraper (330) to pass through the first thermal insulation area (231), the air inlet area (232) and the heat exchange area (233) in sequence to reach the junction of the heat exchange area (233) and the air outlet area (234).

5. The waste heat recovery device according to claim 4, characterized in that: The heat exchange tube (230) comprises a central circular flow channel (236) and flared sections (237) symmetrically distributed on both sides, and the magnetic cleaning scraper block (330) comprises a cylindrical block matching the heat exchange tube (230) and flanges symmetrically distributed on both sides.

6. The waste heat recovery device according to claim 1, characterized in that: The first driving mechanism (320) comprises a conveying dragon (321), a roller (322), a driving motor (323), a first slider (324) and a second slider (325); The waste heat recovery furnace (200) is provided with a C-shaped conveying cylinder (290), the conveying dragon (321) is arranged in the C-shaped conveying cylinder (290), the roller (322) and the conveying dragon (321) are coaxially arranged and connected to each other, the output end of the driving motor (323) is drivingly connected to the roller (322), the conveying blade of the conveying dragon (321) is provided with a first thread section (326), the first slider (324) is slidably connected to the first thread section (326), the first slider (324) is installed on the movable magnetic ring (310), the inner wall of the heat exchange chamber (270) is provided with a slide groove (272), the second slider (325) is slidably connected to the slide groove (272), and the second slider (325) is installed on the movable magnetic ring (310).

7. The waste heat recovery device according to claim 6, characterized in that: The waste heat recovery device further comprises a second cleaning mechanism (400), wherein the second cleaning mechanism (400) comprises a cleaning scraper (410) and a second driving mechanism (420); The cleaning scraper (410) is provided with an avoidance hole (411), and the cleaning scraper (410) is passed through the avoidance hole (411) and is arranged on the heat exchange tube (230), and the inner wall of the avoidance hole (411) is in contact with the heat exchange tube (230), and the second driving mechanism (420) is used to drive the cleaning scraper (410) to move along the extension direction of the heat exchange tube (230).

8. The waste heat recovery device according to claim 7, characterized in that: The second driving mechanism (420) comprises a rotating shaft (421), a third slider (422), an active driving wheel (423), a synchronous belt (424) and a driven driving wheel (425); The rotating shaft (421) is arranged on the waste heat recovery furnace (200), and a second threaded section (426) is provided on the rotating shaft (421). The third slider (422) is slidably connected to the second threaded section (426), and the third slider (422) is installed on the cleaning scraper (410). The rotating shaft (421) is drivingly connected to an active driving wheel (423), and the output end of the driving motor (323) is drivingly connected to the active driving wheel (423). The active driving wheel (423) is wound around the synchronous belt (424), and the synchronous belt (424) is wound around the driven driving wheel (425), and the driven driving wheel (425) is drivingly connected to the roller (322).

9. The waste heat recovery device according to claim 7, characterized in that: The cleaning scraper (410) is provided with an overflow hole (412), and the avoidance hole (411) is embedded with a second scraper (413), and the second scraper (413) is used to abut against the outer wall of the heat exchange tube (230).

10. The waste heat recovery device according to any one of claims 1 to 9, characterized in that: The waste heat recovery device further comprises a flow storage furnace (500), wherein the flow storage furnace (500) is installed on the mounting frame (100), the flow storage furnace (500) is connected to the waste heat recovery furnace (200) via the inlet pipe (261) and the outlet pipe (262), and the flow storage furnace (500) is provided with a water pump, and the water pump is used to drive the heat transfer fluid to pass through the inlet pipe (261), the flow storage heat exchange chamber (280) and return to the flow storage furnace (500) from the outlet pipe (262); The gas outlet bin (240) is provided with a temperature sensor, and the temperature sensor is used to monitor the temperature of the smoke passing through the gas outlet bin (240) in real time; The outlet pipe (262) is provided with a flow control valve (510), and the flow control valve (510) is used to control the speed at which the heat transfer fluid flows out of the flow storage heat exchange chamber (280).

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