Waste heat recovery equipment for chemical processing

Abstract

The invention discloses waste heat recovery equipment for chemical processing. The waste heat recovery equipment comprises a smoke channel, a combustion-supporting gas channel and a cleaning mechanism, wherein the smoke channel is provided with a smoke pipe A and a smoke pipe B; the multiple combustion-supporting gas channels penetrate through the flue gas channel, a multi-way pipe A and a multi-way pipe B are arranged at the two ends of each combustion-supporting gas channel correspondingly, and the cleaning mechanism is arranged in the flue gas channel and used for cleaning the surfaces of the combustion-supporting gas channels. The cleaning mechanism comprises a scraping assembly and a multi-way pipe C; the multiple combustion-supporting gas channels are sleeved with the lantern rings of the multiple scraping assemblies respectively, the lantern rings and the surfaces of the combustion-supporting gas channels form scraping working faces, the multiple lantern rings are connected with the multiple branch pipes of the multi-way pipe C respectively, inner cavities of the lantern rings communicate with the multi-way pipe C, multiple liquid drainage holes are formed in the bottoms of the lantern rings in an annular array mode, and the liquid drainage holes communicate with the inner cavities of the lantern rings. The device has the advantages that the surfaces of a plurality of combustion-supporting gas channels can be quickly cleaned, a worker only needs to execute a longitudinal movement action, the device is not limited by space during cleaning, and scraping operation is convenient and quick to carry out.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, specifically to a waste heat recovery device for chemical processing. Background Technology

[0002] Waste heat recovery is the process of collecting and reusing heat energy that would otherwise be discarded and released into the environment during industrial production, energy conversion, or daily life.

[0003] The industrial sector is the area with the most concentrated and largest amount of waste heat generation, permeating almost all processes. In chemical plants, the flue gas emitted from various cracking furnaces, conversion furnaces, heating furnaces, and roasting furnaces contains a huge amount of heat. This heat can be recovered to preheat the air introduced into the combustion equipment, thereby raising the temperature of the air used as a combustion aid, directly increasing the furnace temperature, improving combustion efficiency, and saving fuel.

[0004] However, the flue gas produced by chemical plants contains viscous substances, such as unreacted raw materials and intermediate products, heavy hydrocarbons and tar, acidic aerosols, etc. These substances are prone to adhering to the surface of heat exchange mechanisms and forming scale, which hinders the heat exchange between flue gas and combustion air. The adhering area is located inside the heat exchange mechanism, and the space is limited when manually scraping it, which restricts the scraping operation and affects the operation.

[0005] In view of this, we propose a waste heat recovery device for chemical processing. Summary of the Invention

[0006] The purpose of this invention is to provide a waste heat recovery device for chemical processing to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a waste heat recovery device for chemical processing, comprising a flue gas passage with flue pipe A and flue pipe B, a cover plate, a combustion-supporting gas passage, and a cleaning mechanism; The flue gas passage is connected to a cover plate by a hinge. The cover plate is sealed to the flue gas passage cleaning port. Multiple combustion-supporting gas passages pass through the flue gas passage. Multiple-port pipes A and B are respectively installed at both ends of the multiple combustion-supporting gas passages. The cleaning mechanism is located in the flue gas passage for cleaning the surface of the combustion-supporting gas passages. The cleaning mechanism includes a scraping component and a multi-port pipe C; Multiple scraping components are respectively fitted onto multiple combustion-supporting gas channels, and the sleeves and the surfaces of the combustion-supporting gas channels form a scraping working surface. Multiple sleeves are respectively connected to multiple branches of the multi-port pipe C, and the inner cavity of the sleeve is connected to the multi-port pipe C. Multiple drainage holes are opened in a ring array at the bottom of the sleeve, and the drainage holes are connected to the inner cavity of the sleeve.

[0008] By moving multiple scraping components from top to bottom, the surface of multiple combustion-supporting gas channels can be cleaned quickly. Workers only need to perform vertical movement, and the cleaning is not limited by space, making the scraping operation convenient and fast.

[0009] Preferably, the scraping assembly further includes an elastic ring and a scraping ring; The elastic ring is disposed on the inner circumference of the collar and is used to close the inner circumference of the collar cavity. The scraper ring is disposed on the inner circumference of the elastic ring.

[0010] The flexible connection of the elastic ring enables the scraper ring to adaptively compensate for installation and dimensional tolerances, ensuring that it always maintains a uniform and tight fit with the surface of the combustion-supporting gas channel, thereby improving the stability and consistency of the scraping effect.

[0011] Preferably, the middle section of the elastic ring has an arc-shaped cross-section, and the middle section of the elastic ring protrudes towards the inner cavity of the collar. The arc-shaped cross-sectional shape gives the elastic ring better radial elastic deformation capability and longer fatigue life.

[0012] Preferably, the cross-sections on both sides of the scraper ring are arc-shaped, the two ends of the scraper ring are fixed to the middle section of the elastic ring, the cross-section of the middle section of the scraper ring is planar, and the middle section of the scraper ring abuts against the surface of the combustion-supporting gas channel.

[0013] The middle section of the scraper ring can generate higher local scraping pressure, effectively removing stubborn scale, while the arc-shaped connecting sections at both ends ensure reliable connection with the elastic ring and stress dispersion, achieving a balance between efficient scraping and structural durability.

[0014] Preferably, the plurality of drainage holes are respectively inclined, with the drainage hole outlets inclined toward the combustion-supporting gas channel. The inclined drainage holes can directionally spray the cleaning fluid onto the surface of the channel that has just been scraped open, achieving precise targeted rinsing.

[0015] Preferably, the multiple collars are connected by a crossbeam, and a guide rod is provided on the crossbeam. The guide rod is arranged longitudinally, and its two ends are fixed to the flue gas passage.

[0016] The crossbeam enables synchronized linkage of all scraping components, ensuring uniformity of the cleaning operation; the guide rod provides precise vertical guidance for the lifting and lowering movement of the entire cleaning mechanism, preventing deflection and jamming, and ensuring smooth and reliable operation.

[0017] Preferably, the crossbeam is connected to the top of the flue gas duct via a fixing assembly, which includes a connecting block A, a connecting block B, and a movable block. The connecting block A is fixed on the crossbeam, the connecting block B is fixed on the top wall inside the flue gas channel, the movable block passes through the connecting block B, and one end of the movable block is inserted into the through hole opened on the connecting block A.

[0018] This constitutes a quick-assembly and disassembly structure. When one end of the movable block is inserted into the perforation, a mechanical interlock is formed, which allows the crossbeam to be at the top of the flue gas passage. During cleaning operations, the cleaning is carried out from top to bottom. The entire cleaning mechanism can be fixed and released by inserting and removing the movable block.

[0019] Preferably, each end of the connecting block B is fixed with a stop block, and the stop block at one end of the movable block can be inserted into the through hole. The stop block restricts the lateral movement of the movable block, preventing the movable block from detaching from the connecting block B.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses multiple scraping components that move from top to bottom to quickly clean the surface of multiple combustion-supporting gas channels. Workers only need to perform vertical movement, and the cleaning is not limited by space, making the scraping operation convenient and fast. 2. To optimize the scraping effect, the scraping assembly further incorporates an elastic ring and a scraper ring. The elastic ring is located on the inner circumference of the collar, and its unique configuration—an arc-shaped section protruding into the inner cavity of the collar—gives it excellent radial elasticity. The scraper ring is fixed to the inner ring of the elastic ring, with its middle section being flat, forming the main scraping cutting edge. The advantages of this elastic connection structure are: the middle section of the elastic ring and the abutting sections on both sides of the scraper ring work together elastically, compensating for each other; it can automatically compensate for the misalignment between the collar and the combustion gas channel caused by processing, installation, or thermal deformation, ensuring that the flat scraping section of the scraper ring always fits tightly against the surface of the combustion gas channel. This not only improves the uniformity and stability of scraping but also avoids jamming or abnormal wear caused by rigid contact, extending the service life of the components. 3. The fixed components form a quick-assembly and disassembly structure. When one end of the movable block is inserted into the perforation, a mechanical interlock is formed, which allows the crossbeam to be at the top of the flue gas passage. During cleaning operations, the cleaning is carried out from top to bottom. The entire cleaning mechanism can be fixed and released by inserting and removing the movable block. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after it has been opened; Figure 3 This is a schematic diagram of the cleaning mechanism of the present invention. Figure 4 This is a schematic diagram of the cleaning mechanism of the present invention; Figure 5 This is a schematic diagram of the fixing component of the present invention; Figure 6 This is a cross-sectional schematic diagram of the scraping component of the present invention; Figure 7 This is a cross-sectional exploded view of the scraping component of the present invention.

[0022] In the diagram: 100, flue gas passage; 200, cover plate; 300, flue pipe A; 400, flue pipe B; 500, combustion-supporting gas passage; 600, multi-port pipe A; 700, multi-port pipe B; 800, cleaning mechanism; 801. Scraping assembly; 802. Multi-port pipe C; 803. Crossbeam; 804. Guide rod; 805. Fixing assembly; 8011, collar; 8012, elastic ring; 8013, scraper ring; 8011-1, drain hole; 8012-1, Elastic section; 8012-2, Connecting section; 8013-1, Scraping section; 8013-2, Abutment section; 8051, Connecting block A; 8052, Connecting block B; 8053, Movable block; 8054, Stop block; 8051-1, Perforation. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 7 A waste heat recovery device for chemical processing includes a flue gas passage 100 with flue pipes A300 and B400, a cover plate 200, a combustion-supporting gas passage 500, and a cleaning mechanism 800; one of the flue pipes A300 and B400 serves as a flue gas inlet pipe connected to the flue gas outlet of the device, and the other serves as a flue gas outlet pipe connected to subsequent flue gas treatment equipment; high-temperature chemical flue gas passes through the flue gas passage 100.

[0025] A cover plate 200 is hinged to the flue gas passage 100 and fixed to the flue gas passage 100 by a lock. The cover plate 200 and the cleaning port of the flue gas passage 100 are sealed together, and a sealing strip is provided at the closure of the cover plate 200 and the cleaning port of the flue gas passage 100. It can be opened when maintenance or cleaning is required, providing great convenience for human and machine operation. Multiple combustion gas passages 500 pass through the flue gas passage 100. Each end of the multiple combustion gas passages 500 is equipped with a multi-port pipe A600 and a multi-port pipe B700. One of the multi-port pipes A600 and B700 connects to the combustion gas inlet pipeline, and the other connects to the equipment combustion gas inlet pipeline. The combustion gas passes through the multiple combustion gas passages 500. During operation, high-temperature flue gas flows through the flue gas passage 100 and over the outer wall of the combustion gas passages 500, transferring its residual heat to the combustion gas flowing inside the combustion gas passages 500, thus heating the combustion gas and achieving energy recovery. However, sticky substances in the flue gas, such as tar and heavy hydrocarbons, will continuously adhere to the outer surface of the combustion-supporting gas passage 500, forming a heat-insulating scale layer. A cleaning mechanism 800 is installed inside the flue gas passage 100 to clean the surface of the combustion-supporting gas passage 500.

[0026] The cleaning mechanism 800 includes a scraping component 801 and a multi-port pipe C802. The collars 8011 of the multiple scraping components 801 are respectively sleeved on multiple combustion-supporting gas channels 500. The collars 8011 and the surface of the combustion-supporting gas channels 500 form a scraping working surface. The multiple collars 8011 are respectively connected to multiple branch pipes of the multi-port pipe C802, and the inner cavity of the collars 8011 is connected to the multi-port pipe C802. The main pipe of the multi-port pipe C802 is provided with a connector. When the cover plate 200 is opened, the external cleaning fluid pipe can be connected to the connector to deliver the cleaning fluid into the multi-port pipe C802 and into the multiple collars 8011. The bottom of the collar 8011 has multiple drain holes 8011-1 arranged in a ring array, and the drain holes 8011-1 are connected to the inner cavity of the collar 8011. The incoming cleaning liquid is discharged from the drain holes 8011-1 and flows to the surface of the combustion-supporting gas channel 500 to soften the heat insulation scale layer on the surface of the combustion-supporting gas channel 500. Then the collar 8011 moves along the combustion-supporting gas channel 500 to scrape off the heat insulation scale layer.

[0027] In this embodiment, multiple drainage holes 8011-1 are respectively inclined, and the outlets of the drainage holes 8011-1 are inclined toward the combustion-supporting gas channel 500. The inclined drainage holes 8011-1 can directionally spray the cleaning fluid onto the surface of the channel that has just been scraped open, achieving precise targeted rinsing.

[0028] Specifically, the scraping assembly 801 also includes an elastic ring 8012 and a scraper ring 8013. The elastic ring 8012 is disposed on the inner circumference of the collar 8011 and is used to close the inner circumference of the inner cavity of the collar 8011. The scraper ring 8013 is disposed on the inner circumference of the elastic ring 8012. Through the flexible connection of the elastic ring 8012, the scraper ring 8013 can adaptively compensate for installation and dimensional tolerances, ensuring that it always maintains a uniform and tight fit with the surface of the combustion-supporting gas channel 500, thereby improving the stability and consistency of the scraping effect.

[0029] The elastic ring 8012 has connecting sections 8012-2 on both sides, which are fixed to the inner circumference of the collar 8011. The middle section of the elastic ring 8012 is the elastic section 8012-1, which has an arc-shaped cross-section and protrudes towards the inner cavity of the collar 8011. The arc-shaped cross-section gives the elastic ring 8012 better radial elastic deformation capacity and longer fatigue life. The scraper ring 8013 has abutting sections 8013-2 on both sides, which have an arc-shaped cross-section and are elastic. The abutting sections 8013-2 are fixed to the elastic section 8012-1. The middle section of the scraper ring 8013 is the scraping section 8013-1, which has a flat cross-section and abuts against the surface of the combustion-supporting gas channel 500. The middle section of the scraper ring 8013 can generate higher local scraping pressure, effectively removing stubborn scale, while the arc-shaped connecting sections at both ends ensure reliable connection with the elastic ring 8012 and stress dispersion, achieving a balance between efficient scraping and structural durability.

[0030] To optimize the scraping effect, the scraping assembly 801 further incorporates an elastic ring 8012 and a scraper ring 8013. The elastic ring 8012 is located on the inner circumference of the collar 8011, with its middle section having an arc-shaped cross-section that bulges towards the inner cavity of the collar 8011. This special configuration gives it excellent radial elasticity. The scraper ring 8013 is fixed to the inner ring of the elastic ring 8012, with its middle section being flat, forming the main scraping cutting edge. The advantages of this elastic connection structure are: the middle section of the elastic ring 8012 and the abutment sections 8013-2 on both sides of the scraper ring 8013 work together elastically, compensating for each other; it can automatically compensate for the misalignment between the collar 8011 and the combustion gas channel 500 caused by processing, installation, or thermal deformation, ensuring that the flat scraping section of the scraper ring 8013 always fits tightly against the surface of the combustion gas channel 500. This not only improves the uniformity and stability of scraping but also avoids jamming or abnormal wear caused by rigid contact, extending the service life of the components.

[0031] Furthermore, multiple collars 8011 are connected by a crossbeam 803, and a guide rod 804 is provided on the crossbeam 803. The guide rod 804 is arranged longitudinally, and both ends of the guide rod 804 are fixed to the flue gas passage 100.

[0032] The crossbeam 803 enables the synchronous linkage of all scraping components 801, ensuring the uniformity of the cleaning operation; the guide rod 804 provides precise vertical guidance for the lifting and lowering movement of the entire cleaning mechanism 800, preventing deflection and jamming, and ensuring smooth and reliable operation.

[0033] Furthermore, the crossbeam 803 is connected to the top of the flue gas passage 100 via a fixing component 805. The fixing component 805 includes a connecting block A8051, a connecting block B8052, and a movable block 8053. The connecting block A8051 is fixed on the crossbeam 803, the connecting block B8052 is fixed on the top wall of the flue gas passage 100, and the movable block 8053 passes through the connecting block B8052, with one end of the movable block 8053 being inserted into and engaged with the through hole 8051-1 opened on the connecting block A8051.

[0034] This constitutes a quick-assembly and disassembly structure. When one end of the movable block 8053 is inserted into the through hole 8051-1, a mechanical interlock is formed, which allows the crossbeam 803 to be at the top of the flue gas channel 100. During the cleaning operation, the cleaning is carried out from top to bottom. The entire cleaning mechanism 800 can be fixed and released by inserting and removing the movable block 8053.

[0035] In this embodiment, stop blocks 8054 are fixed at both ends of the connecting block B8052, and the stop block 8054 at one end of the movable block 8053 can be inserted into the through hole 8051-1. The stop block 8054 restricts the lateral movement of the movable block 8053, and the movable block 8053 will not detach from the connecting block B8052.

[0036] Working principle: During normal operation, the cleaning mechanism 800 is locked at the top of the flue gas passage 100 by the fixing component 805. High-temperature chemical flue gas flows through the flue gas passage 100, and the high-temperature flue gas exchanges heat with the combustion-supporting gas flowing inside the combustion-supporting gas passage 500. The waste heat is transferred to the combustion-supporting air flowing inside the combustion-supporting gas passage 500, and the heated combustion-supporting gas is sent into the combustion equipment for combustion. At the same time, viscous substances in the flue gas will gradually form scale on the outer wall of the combustion-supporting gas passage 500.

[0037] When cleaning the scale on the outer wall of the combustion-supporting gas channel 500, open the cover plate 200 and connect the external cleaning fluid pipeline to the connector of the multi-port pipe C802. The cleaning fluid is delivered to the inner cavity of the collar 8011 by an external liquid pump and sprayed directionally from the inclined drain hole 8011-1 onto the surface that has just been scraped off, to lubricate, cool, and assist in peeling off the scale on the outer wall. The stop block 8054 at the other end of the movable block 8053 is pulled, and the stop block 8054 at one end of the movable block 8053 moves away from the perforation 8051-1. The operator moves the collar 8011 from top to bottom, and the crossbeam 803 moves longitudinally along the guide rod 804. Under the elastic adaptive pressure of the elastic section 8012-1 in the middle of the elastic ring 8012 and the abutment sections 8013-2 on both sides of the scraper ring 8013, the flat scraping section 8013-1 of the scraper ring 8013 tightly adheres to the surface of the combustion-supporting gas channel 500, scraping off the scale layer treated by the cleaning fluid. The scraped scale layer is then processed out from the flue gas channel 100.

[0038] After the cleaning process is completed, the scraping assembly 801 can be raised to the top of the flue gas passage 100. The stop block 8054 at the other end of the movable block 8053 can be pushed into the through hole 8051-1, thus re-locking the scraping assembly 801 at the top of the flue gas passage 100. The cover plate 200 can then be closed and secured to the flue gas passage 100.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waste heat recovery device for chemical processing, characterized in that: It includes a flue gas passage (100) with flue pipe A (300) and flue pipe B (400), a cover plate (200), a combustion-supporting gas passage (500) and a cleaning mechanism (800); A cover plate (200) is rotatably connected to the flue gas passage (100) via a hinge. The cover plate (200) is closed to the cleaning port of the flue gas passage (100). Multiple combustion-supporting gas passages (500) pass through the flue gas passage (100) respectively. Multiple-port pipes A (600) and B (700) are respectively provided at both ends of the multiple combustion-supporting gas passages (500). A cleaning mechanism (800) is provided in the flue gas passage (100) for cleaning the surface of the combustion-supporting gas passages (500). The cleaning mechanism (800) includes a scraping component (801) and a multi-port tube C (802); Multiple scraping components (801) have collars (8011) respectively fitted onto multiple combustion-supporting gas channels (500). The collars (8011) and the surfaces of the combustion-supporting gas channels (500) form a scraping working surface. Multiple collars (8011) are respectively connected to multiple branches of the multi-port pipe C (802), and the inner cavity of the collar (8011) is connected to the multi-port pipe C (802). Multiple drain holes (8011-1) are opened in a ring array at the bottom of the collar (8011), and the drain holes (8011-1) are connected to the inner cavity of the collar (8011).

2. The waste heat recovery equipment for chemical processing according to claim 1, characterized in that: The scraping assembly (801) also includes an elastic ring (8012) and a scraping ring (8013); The elastic ring (8012) is disposed on the inner circumference of the collar (8011), and the elastic ring (8012) is used to close the inner circumference of the inner cavity of the collar (8011). The scraper ring (8013) is disposed on the inner circumference of the elastic ring (8012).

3. The waste heat recovery equipment for chemical processing according to claim 2, characterized in that: The middle section of the elastic ring (8012) has an arc-shaped cross section, and the middle section of the elastic ring (8012) protrudes towards the inner cavity of the collar (8011).

4. The waste heat recovery equipment for chemical processing according to claim 3, characterized in that: The scraper ring (8013) has arc-shaped cross sections on both sides. The two ends of the scraper ring (8013) are fixed to the middle section of the elastic ring (8012). The middle section of the scraper ring (8013) has a flat cross section. The middle section of the scraper ring (8013) abuts against the surface of the combustion-supporting gas channel (500).

5. The waste heat recovery equipment for chemical processing according to claim 1, characterized in that: Multiple drainage holes (8011-1) are respectively opened at an angle, and the outlet of the drainage hole (8011-1) is inclined toward the combustion-supporting gas channel (500).

6. The waste heat recovery equipment for chemical processing according to claim 1, characterized in that: Multiple collars (8011) are connected by a crossbeam (803). A guide rod (804) is provided on the crossbeam (803). The guide rod (804) is arranged longitudinally, and both ends of the guide rod (804) are fixed to the flue gas passage (100).

7. The waste heat recovery equipment for chemical processing according to claim 6, characterized in that: The crossbeam (803) is connected to the top of the flue gas passage (100) via a fixing component (805). The fixing component (805) includes a connecting block A (8051), a connecting block B (8052), and a movable block (8053). The connecting block A (8051) is fixed on the crossbeam (803), the connecting block B (8052) is fixed on the inner top wall of the flue gas passage (100), the movable block (8053) passes through the connecting block B (8052), and one end of the movable block (8053) is inserted into the through hole (8051-1) opened on the connecting block A (8051).

8. The waste heat recovery equipment for chemical processing according to claim 7, characterized in that: The connecting block B (8052) has a stop block (8054) fixed at both ends, and the stop block (8054) at one end of the movable block (8053) can be inserted into the through hole (8051-1).

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