Chemical waste gas heat recovery device

Abstract

The present application relates to the field of waste heat treatment, in particular to a kind of chemical waste gas waste heat recovery device. Including waste heat exchange cylinder and waste gas conveying device, waste gas conveying device includes waste gas cylinder and cleaning structure, cleaning structure includes scraper, temperature sensing cylinder and transmission part, transmission part and waste gas cylinder are driven by thread cooperation, the outer peripheral wall of waste heat exchange cylinder is covered by soot, it is isolated with high-temperature waste gas, leading to its exchange rate of high-temperature waste gas waste heat reduces, high-temperature waste gas heat also cannot be effectively absorbed by heat exchange medium in waste heat exchange cylinder, so as to cause the temperature difference of the upper and lower ends of waste gas cylinder to be smaller and smaller. Then the gas in temperature sensing cylinder is heated and expanded and makes scraper rotate around the first axis by transmission part, to scrape off soot on the outer peripheral wall of waste heat exchange cylinder, so that waste heat exchange cylinder is directly contacted with high-temperature waste gas again, improve the waste heat recovery efficiency of the equipment to high-temperature waste gas, promote the development of high-efficiency energy-saving industry.

Description

Technical Field

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

[0002] With the development of the times, people are paying more and more attention to the development of high-efficiency and energy-saving industries. Achieving energy-saving effects while maintaining high efficiency is the core essence of high-efficiency and energy-saving industries. Therefore, how to design energy-saving boilers and boiler auxiliary equipment has become a hot topic. Boilers with existing technology produce a large amount of high-temperature exhaust gas. Directly discharging this exhaust gas leads to heat loss and does not meet the national requirements for the development of high-efficiency and energy-saving industries.

[0003] Existing boiler exhaust heat absorption equipment commonly uses waste heat exchange to heat and utilize the heat exchange medium. However, because the exhaust gas contains a large amount of soot, after a period of operation, a significant amount of soot accumulates on the heat exchange equipment, reducing the efficiency of heat exchange with the high-temperature exhaust gas and consequently lowering the waste heat recovery efficiency. Summary of the Invention

[0004] This invention provides a waste heat recovery device for chemical waste gas to solve the problem of reduced waste heat recovery efficiency of high-temperature waste gas.

[0005] The present invention discloses a chemical waste gas waste heat recovery device, which adopts the following technical solution: A chemical waste gas waste heat recovery device includes a waste heat exchange cylinder and multiple waste gas conveying devices. The waste heat exchange cylinder is vertically arranged. The axis of the waste heat exchange cylinder is a first axis. Multiple waste gas conveying devices are evenly distributed along the first axis. Each waste gas conveying device includes a waste gas cylinder and a cleaning structure. The waste gas cylinder is sleeved on the outside of the waste heat exchange cylinder. Adjacent waste gas cylinders are connected end to end. The cleaning structure is located between the waste heat exchange cylinder and the waste gas cylinder, and includes a scraper, a temperature-sensing cylinder, and a transmission component. The scraper is vertically and rotatably mounted on the waste gas cylinder around the first axis, and is located on one side of the outer peripheral wall of the waste heat exchange cylinder. The temperature-sensing cylinder is located at the lower end of the waste gas cylinder. The temperature-sensing cylinder includes a driving piston. The driving piston is rotatably and slidably mounted inside the temperature-sensing cylinder. The transmission component and the waste gas cylinder are driven by a threaded connection. The cleaning structure is configured such that when the outer peripheral wall of the waste heat exchange cylinder is covered with soot, causing the temperature difference between the upper and lower ends of the exhaust cylinder to decrease, the gas in the temperature sensing cylinder expands due to heat, pushing the drive piston to drive the transmission component to drive the scraper to rotate around the first axis to scrape off the soot.

[0006] Furthermore, the transmission components include a transmission ring, a rotating ring, a synchronizing element, a transmission rod, and a limiting structure. The transmission ring's axis coincides with the first axis and is located at the lower end of the waste gas cylinder, above the temperature-sensing cylinder. A protrusion is provided on the outer peripheral wall of the transmission ring. A spiral groove is provided on the inner peripheral wall of the waste gas cylinder. The protrusion is slidably installed within the spiral groove. The rotating ring's axis coincides with the first axis. The rotating ring is rotatably disposed within the transmission ring. A torsion spring is provided between the rotating ring and the transmission ring. The synchronizing element is located between the rotating ring and the scraper rod, used to drive the scraper rod to rotate synchronously around the first axis when the rotating ring rotates. The transmission rod is located between the rotating ring and the drive piston, with one end connected to the rotating ring and the other end connected to the drive piston. The limiting structure is located between the rotating ring and the waste heat exchange cylinder, used to lock the rotating ring from rotating with the transmission ring when the drive piston drives the transmission ring to move upwards and rotate along the spiral groove, thus storing force in the torsion spring. When the transmission ring rises to a preset position, the rotating ring is unlocked to release the force in the torsion spring.

[0007] Furthermore, the limiting structure includes a limiting groove and a limiting block. The limiting groove is radially disposed on the transmission ring along the waste heat exchange cylinder. The limiting block is radially slidably disposed between the waste heat exchange cylinder and the transmission ring. A limiting spring is provided between the limiting block and the waste heat exchange cylinder. The limiting block is engaged in the limiting groove to prevent the transmission ring from rotating when the drive piston drives the transmission ring to rotate. When the transmission ring rises to a preset position, it disengages from the limiting groove to unlock the transmission ring, allowing the torsion spring to drive the transmission ring to rotate.

[0008] Furthermore, the synchronizing component includes a synchronizing ring and a synchronizing rod. The synchronizing ring is sleeved on the outside of the waste heat exchange cylinder, with its axis coinciding with the first axis. The synchronizing ring is rotatably mounted on the inner wall of the exhaust pipe. A scraper is mounted on the synchronizing ring. The synchronizing rod is located between the synchronizing ring and the rotating ring, with one end connected to the synchronizing ring and the other end connected to the rotating ring.

[0009] Furthermore, the cleaning structure also includes a damping cylinder. The damping cylinder is located between the synchronizing ring and the rotating ring. The housing of the damping cylinder is fixed to the waste heat exchange cylinder, and the damping piston is rotatably mounted on the waste heat exchange cylinder. A damping connecting rod is located on the underside of the damping cylinder. One end of the damping connecting rod is connected to the damping piston, and the other end is connected to the rotating ring.

[0010] Furthermore, the upper end of the exhaust gas stack is provided with at least one air inlet. The axis of the air inlet coincides with the tangent direction of the cross-section of the exhaust gas stack. The air inlet is connected to the exhaust gas stack. The lower end of the exhaust gas stack is provided with at least one air outlet. The air outlet is connected to the air inlet of the adjacent exhaust gas stack.

[0011] Furthermore, the synchronizing ring is equipped with sieve holes. The upper end of the exhaust gas cylinder is funnel-shaped with the smaller end facing down, and the lower end is cylindrical. A dust collection cylinder is fixed to the inner wall of the exhaust gas cylinder. The dust collection cylinder is also funnel-shaped with the smaller end facing down. The outer peripheral wall of the dust collection cylinder is in contact with the inner peripheral wall of the exhaust gas cylinder. A dust-blocking ring is provided at the lower end of the dust collection cylinder. The outer end of the dust-blocking ring slopes downward and connects to the lower end of the dust collection cylinder. The inner end abuts against the synchronizing ring.

[0012] Furthermore, the cleaning structure also includes an adjustment structure. The adjustment structure is used to keep the scraper away from the waste heat exchanger when the heat exchange rate of the waste heat exchanger is normal, and to drive the scraper to press against the waste heat exchanger when the heat exchange rate of the waste heat exchanger decreases.

[0013] Furthermore, the adjustment structure includes an adjustment groove, an adjustment rod, and an adjustment cylinder. The adjustment groove is radially disposed on the synchronization ring. The scraper rod is slidably mounted within the adjustment groove, and a return spring connects the scraper rod and the adjustment groove. The return spring is used to return the scraper rod to the end of the adjustment groove away from the waste heat exchange cylinder. The adjustment cylinder is coaxially disposed on the upper end of the transmission ring. The adjustment cylinder is funnel-shaped with the smaller end facing down. The adjustment rod is horizontally disposed between the scraper rod and the adjustment cylinder. The adjustment rod is slidably mounted radially on the lower end of the scraper rod. An adjustment spring connects the adjustment rod and the scraper rod to ensure that the adjustment rod always abuts against the inner circumferential wall of the adjustment cylinder.

[0014] Furthermore, a balancing cylinder is provided at the upper end of the exhaust gas stack. Inside the balancing cylinder is a balancing piston that can slide up and down and rotate. A balancing spring is provided below the balancing piston. One end of the balancing spring is connected to the balancing piston, and the other end passes through a synchronizing ring and is connected to the drive piston. This spring is used to cause the drive piston to reset and achieve balance after the heat exchange rate of the waste heat exchange stack recovers.

[0015] The beneficial effects of this invention are as follows: When the outer wall of the waste heat exchange cylinder is covered with soot, it isolates the waste heat exchange cylinder from the high-temperature exhaust gas, reducing the heat exchange rate of the waste heat exchange cylinder. The heat from the high-temperature exhaust gas cannot be effectively absorbed by the heat exchange medium inside the waste heat exchange cylinder, resulting in a decreasing temperature difference between the upper and lower ends of the exhaust gas cylinder. The gas inside the temperature-sensing cylinder expands due to heat and, through a transmission component, causes the scraper to rotate around the first axis, scraping away the soot on the outer wall of the waste heat exchange cylinder. This allows the waste heat exchange cylinder to re-enter direct contact with the high-temperature exhaust gas, improving the waste heat recovery efficiency of the equipment and promoting the development of the high-efficiency energy-saving industry. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of a chemical waste gas waste heat recovery device according to the present invention;

[0018] Figure 2 This is a front view of an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Sectional view at point AA;

[0020] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0021] Figure 5 This is a schematic diagram of the exhaust gas cylinder and cleaning structure according to an embodiment of the present invention;

[0022] Figure 6 An exploded view of the clean structure according to an embodiment of the present invention;

[0023] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0024] Figure 8 This is a schematic diagram of the synchronization ring structure according to an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of the structure of the ash collection cylinder and the ash-blocking ring according to an embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram of the rotating ring, synchronizing rod, damping connecting rod, and transmission rod according to an embodiment of the present invention;

[0027] In the diagram: 100, Waste heat exchange cylinder; 200, Exhaust gas cylinder; 210, Inlet cylinder; 220, Outlet cylinder; 230, Ash collection cylinder; 240, Ash baffle ring; 250, Balance cylinder; 251, Balance piston; 300, Scraper; 400, Temperature sensing cylinder; 410, Drive piston; 510, Transmission ring; 520, Rotary ring; 530, Transmission rod; 610, Synchronization ring; 620, Synchronization rod; 710, Limiting groove; 720, Limiting block; 730, Limiting spring; 800, Damping cylinder; 810, Damping connecting rod; 910, Adjusting groove; 920, Adjusting rod; 930, Adjusting cylinder. Detailed Implementation

[0028] 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.

[0029] An embodiment of the waste heat recovery device for chemical waste gas of the present invention, such as... Figures 1 to 10The diagram shows a waste heat recovery device for chemical waste gas, comprising a waste heat exchange cylinder 100 and multiple waste gas conveying devices. The waste heat exchange cylinder 100 is vertically aligned. The axis of the waste heat exchange cylinder 100 is a first axis. A heat exchange medium flows inside the waste heat exchange cylinder 100. Multiple waste gas conveying devices are evenly distributed along the first axis. Each waste gas conveying device includes a waste gas cylinder 200 and a cleaning structure. The waste gas cylinder 200 is fitted around the outside of the waste heat exchange cylinder 100. Adjacent waste gas cylinders 200 are connected end-to-end.

[0030] The cleaning structure, located between the waste heat exchange cylinder 100 and the exhaust gas cylinder 200, includes a scraper 300, a temperature-sensing cylinder 400, and a transmission component. The scraper 300 is vertically mounted on the exhaust gas cylinder 200 and rotatably mounted about a first axis, situated on one side of the outer peripheral wall of the waste heat exchange cylinder 100. The temperature-sensing cylinder 400 is located at the lower end of the exhaust gas cylinder 200. The temperature-sensing cylinder 400 includes a drive piston 410. The drive piston 410 is rotatably and slidably mounted within the temperature-sensing cylinder 400. The transmission component and the exhaust gas cylinder 200 are connected via a threaded connection. The cleaning structure is configured such that when the outer peripheral wall of the waste heat exchange cylinder 100 is covered with soot, causing the temperature difference between the upper and lower ends of the exhaust gas cylinder 200 to decrease, the gas inside the temperature sensing cylinder 400 expands due to heat, pushing the drive piston 410 to drive the transmission component to rotate the scraper 300 around the first axis to scrape off the soot, so that the waste heat exchange cylinder 100 can re-come into direct contact with the high-temperature exhaust gas, thereby improving the waste heat recovery efficiency of the equipment for high-temperature exhaust gas and promoting the development of the high-efficiency energy-saving industry.

[0031] In this embodiment, the transmission components include a transmission ring 510, a rotating ring 520, a synchronizing element, a transmission rod 530, and a limiting structure. The transmission ring 510 is located at the lower end of the exhaust gas cylinder 200, with its axis coinciding with the first axis, and is situated above the temperature-sensing cylinder 400. A protrusion is provided on the outer peripheral wall of the transmission ring 510. A spiral groove is provided on the inner peripheral wall of the exhaust gas cylinder 200. The protrusion is slidably mounted within the spiral groove. The rotating ring 520 is coinciding with the first axis. The rotating ring 520 is rotatably disposed within the transmission ring 510. A torsion spring is provided between the rotating ring 520 and the transmission ring 510; the torsion spring does not store force in its initial state. The synchronizing element is located between the rotating ring 520 and the scraper rod 300, and is used to drive the scraper rod 300 to rotate synchronously around the first axis when the rotating ring 520 rotates. The transmission rod 530 is located between the rotating ring 520 and the drive piston 410, with one end connected to the rotating ring 520 and the other end connected to the drive piston 410. A limiting structure is located between the rotating ring 520 and the waste heat exchange cylinder 100. This structure prevents the rotating ring 520 from rotating with the transmission ring 510 when the drive piston 410 drives the transmission ring 510 to move upwards and rotate along the spiral groove, thus allowing the torsion spring to store force. When the transmission ring 510 rises to a preset position, the rotating ring 520 is unlocked, releasing the torsion spring. Initially, the limiting structure does not restrict the rotation of the rotating ring 520.

[0032] In this embodiment, the limiting structure includes a limiting groove 710 and a limiting block 720. The limiting groove 710 is radially disposed on the transmission ring 510 along the waste heat exchange cylinder 100.

[0033] A limiting block 720 is slidably disposed radially between the waste heat exchange cylinder 100 and the drive ring 510. A limiting spring 730 is provided between the limiting block 720 and the waste heat exchange cylinder 100. The limiting block 720 is engaged in the limiting groove 710, and in its initial state, the limiting block 720 does not enter the limiting groove 710 to limit the rotating ring 520. It is used to stop the rotating ring 520 from rotating when the drive piston 410 drives the drive ring 510 to rotate, and when the drive ring 510 rises to a preset position, it disengages from the limiting groove 710 to unlock the rotating ring 520, allowing the torsion spring to drive the rotating ring 520 to rotate. The use of the limiting spring 730 ensures that the limiting structure can only overcome the limiting spring 730 and proceed to the next step after the temperature difference between the upper and lower ends of the waste gas cylinder 200 has decreased to a specific value, avoiding cleaning due to slight changes that could affect the heat exchange efficiency.

[0034] In this embodiment, the synchronizing element includes a synchronizing ring 610 and a synchronizing rod 620. The synchronizing ring 610 is sleeved on the outside of the waste heat exchange cylinder 100 with its axis coinciding with the first axis. The synchronizing ring 610 is rotatably mounted on the inner wall of the exhaust pipe. A scraper 300 is disposed on the synchronizing ring 610. The synchronizing rod 620 is disposed between the synchronizing ring 610 and the rotating ring 520, with one end connected to the synchronizing ring 610 and the other end connected to the rotating ring 520. Under the drive of the synchronizing rod 620, the synchronizing ring 610 and the rotating ring 520 rotate together.

[0035] In this embodiment, the cleaning structure also includes a damping cylinder 800. The damping cylinder 800 is located between the synchronizing ring 610 and the rotating ring 520. The housing of the damping cylinder 800 is fixed to the waste heat exchange cylinder 100, and the damping piston is rotatably mounted on the waste heat exchange cylinder 100. A damping connecting rod 810 is provided on the lower side of the damping cylinder 800. One end of the damping connecting rod 810 is connected to the damping piston, and the other end is connected to the rotating ring 520. Under the action of the damping cylinder 800, the torsion spring release force is released slowly, thereby making the scraper 300 scrape more thoroughly.

[0036] In this embodiment, at least one air inlet 210 is provided at the upper end of the exhaust gas cylinder 200. The axis of the air inlet 210 coincides with the tangential direction of the cross-section of the exhaust gas cylinder 200. The air inlet 210 is connected to the exhaust gas cylinder 200. At least one air outlet 220 is provided at the lower end of the exhaust gas cylinder 200. The air outlet 220 is connected to the air inlet 210 of the adjacent exhaust gas cylinder 200, and is used to allow the high-temperature exhaust gas to enter the exhaust gas cylinder 200 and flow along the cylinder wall of the exhaust gas cylinder 200 to form a rotation, so that some of the dust in the exhaust gas remains on the inner peripheral wall of the exhaust gas cylinder 200 under the action of centrifugal force.

[0037] In this embodiment, the synchronization ring 610 is provided with sieve holes. The upper end of the exhaust gas cylinder 200 is funnel-shaped with the smaller end facing down, and the lower end is cylindrical. A dust collection cylinder 230 is fixed on the inner wall of the exhaust gas cylinder 200. The dust collection cylinder 230 is funnel-shaped with the smaller end facing down. The outer peripheral wall of the dust collection cylinder 230 is in contact with the inner peripheral wall of the exhaust gas cylinder 200. A dust-blocking ring 240 is provided at the lower end of the dust collection cylinder 230. The outer end of the dust-blocking ring 240 is inclined downward and connected to the lower end of the dust collection cylinder 230. The inner end abuts against the synchronization ring 610. Under the action of centrifugal force, some of the dust remaining on the inner peripheral wall of the exhaust gas cylinder 200 slides down the dust collection cylinder 230 and falls into the dust collection cylinder 230.

[0038] In this embodiment, the cleaning structure also includes an adjustment structure. The adjustment structure is used to move the scraper 300 away from the waste heat exchange cylinder 100 when the heat exchange rate of the waste heat exchange cylinder 100 is normal, and to drive the scraper 300 to press against the waste heat exchange cylinder 100 when the heat exchange rate of the waste heat exchange cylinder 100 decreases, thereby preventing the scraper 300 from affecting the waste heat exchange cylinder 100 to perform waste heat exchange.

[0039] In this embodiment, the adjustment structure includes an adjustment groove 910, an adjustment rod 920, and an adjustment cylinder 930. The adjustment groove 910 is radially disposed on the synchronization ring 610. The scraper rod 300 is slidably mounted in the adjustment groove 910, and a return spring is connected between the scraper rod 300 and the adjustment groove 910. The return spring is used to return the scraper rod 300 to the end of the adjustment groove 910 away from the waste heat exchange cylinder 100. The adjustment cylinder 930 is coaxially disposed on the upper end of the transmission ring 510. The adjustment cylinder 930 is funnel-shaped with the smaller end facing down. The adjustment rod 920 is horizontally disposed between the scraper rod 300 and the adjustment cylinder 930. The adjustment rod 920 is radially slidably mounted on the lower end of the scraper rod 300 along the synchronization ring 610. An adjustment spring is connected between the adjustment rod 920 and the scraper rod 300 to ensure that the adjustment rod 920 always abuts against the inner peripheral wall of the adjustment cylinder 930. When the transmission ring 510 moves upward, it drives the adjusting cylinder 930 to move upward, causing the adjusting rod 920, which abuts against the inner circumferential wall of the adjusting cylinder 930, to drive the scraper 300 closer to the waste heat exchange cylinder 100. When the heat exchange rate of the waste heat exchange cylinder 100 is at a normal level, the scraper 300 is moved away from the waste heat exchange cylinder 100 by the action of the adjusting spring, so as to avoid sticking to the outer wall of the waste heat exchange cylinder 100 and affecting the heat exchange rate.

[0040] In this embodiment, a balancing cylinder 250 is provided at the upper end of the waste gas stack 200. A balancing piston 251, which can slide up and down and rotate, is provided inside the balancing cylinder 250. A balancing spring is provided on the lower side of the balancing piston 251. One end of the balancing spring is connected to the balancing piston 251, and the other end passes through the synchronizing ring 610 and is connected to the driving piston 410. This spring is used to cause the driving piston 410 to reset and achieve balance after the heat exchange rate of the waste heat exchange stack 100 recovers. After the dust removal is completed, the balancing spring resets to assist the driving piston 410 in resetting.

[0041] Based on the above embodiments, the operating principle and process of this invention are as follows: During use, the heat exchange medium flows upward from the lower end of the waste heat exchange cylinder 100, while the high-temperature exhaust gas from the boiler flows downward from the upper exhaust gas cylinder 200. When the outer peripheral wall of the waste heat exchange cylinder 100 is covered with soot, the waste heat exchange cylinder 100 is isolated from the high-temperature exhaust gas, resulting in a decrease in the heat exchange rate of the waste heat exchange cylinder 100. The heat from the high-temperature exhaust gas cannot be effectively absorbed by the heat exchange medium within the waste heat exchange cylinder 100, causing the temperature difference between the upper and lower ends of the exhaust gas cylinder 200 to decrease. Then, the gas inside the temperature-sensing cylinder 400 expands due to heat and, through the transmission component, causes the scraper 300 to rotate around the first axis, scraping away the soot on the outer peripheral wall of the waste heat exchange cylinder 100. This allows the waste heat exchange cylinder 100 to re-enter direct contact with the high-temperature exhaust gas, improving the waste heat recovery efficiency of the equipment and promoting the development of the high-efficiency energy-saving industry.

[0042] Specifically, when the outer wall of the waste heat exchange cylinder 100 is covered with soot, it isolates the waste heat exchange cylinder 100 from the high-temperature exhaust gas, causing the temperature at the lower end of the exhaust gas cylinder 200 to rise. The gas volume inside the temperature-sensing cylinder 400 expands, pushing the drive piston 410 upwards. The drive piston 410 drives the transmission ring 510 to move upwards along the threaded groove via the transmission rod 530, while simultaneously rotating. At this time, the limiting block 720 is stuck in the limiting groove 710, causing the rotating ring 520 to only move upwards with the transmission ring 510 without rotating. That is, relative rotation occurs between the transmission ring 510 and the rotating ring 520, causing the torsion spring to store force. When the transmission ring 510 rises to the preset position, the limit block 720 disengages from the limit groove 710. The torsion spring releases force, causing the rotating ring 520 to drive the synchronous ring 610 to rotate through the synchronous rod 620. This causes the scraper 300 to rotate with the synchronous ring 610 to scrape off the soot on the waste heat exchange cylinder 100. Under the action of the damping cylinder 800, the torsion spring releases force slowly, thus allowing the scraper 300 to scrape more thoroughly.

[0043] After the soot on the waste heat exchange cylinder 100 is removed to restore its heat exchange rate to a normal level, the temperature at the lower end of the exhaust cylinder 200 decreases. This causes the drive piston 410 to move downwards, and the transmission ring 510 moves downwards along the threaded groove while rotating in the opposite direction. Simultaneously, the limiting block 720 re-engages in the limiting groove 710, causing relative rotation between the transmission ring 510 and the rotating ring 520, which in turn causes the torsion spring to recharge. When the transmission ring 510 moves to the preset position, the limiting block 720 disengages from the limiting groove 710, and the torsion spring releases its force, causing the rotating ring 520 to drive the synchronous ring 610 to rotate in the opposite direction via the synchronous rod 620. This causes the scraper rod 300 to reset as the synchronous ring 610 rotates in the opposite direction, further scraping away the soot on the waste heat exchange cylinder 100.

[0044] Furthermore, when the transmission ring 510 moves upward, it drives the adjusting cylinder 930 to move upward, causing the adjusting rod 920, which abuts against the inner circumferential wall of the adjusting cylinder 930, to drive the scraper 300 closer to the waste heat exchange cylinder 100. When the heat exchange rate of the waste heat exchange cylinder 100 is at a normal level, the scraper 300 is moved away from the waste heat exchange cylinder 100 by the action of the adjusting spring, so as to avoid sticking to the outer wall of the waste heat exchange cylinder 100 and affecting the heat exchange rate.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A waste heat recovery device for chemical waste gas, characterized in that: Includes a waste heat exchange cylinder and multiple waste gas conveying devices; The waste heat exchange cylinder axis is set vertically; the waste heat exchange cylinder axis is the first axis. Multiple exhaust gas conveying devices are evenly distributed along the first axis; each exhaust gas conveying device includes an exhaust gas cylinder and a cleaning structure. The exhaust gas cylinder is fitted outside the waste heat exchange cylinder; adjacent exhaust gas cylinders are connected end to end; at least one air inlet cylinder is provided at the upper end of the exhaust gas cylinder; the axis of the air inlet cylinder coincides with the tangent direction of the cross-section of the exhaust gas cylinder; the air inlet cylinder is connected to the exhaust gas cylinder. The exhaust gas cylinder has at least one exhaust pipe at its lower end; the exhaust pipe is connected to the intake pipe of the adjacent exhaust gas cylinder; the upper end of the exhaust gas cylinder is funnel-shaped with the smaller end facing down, and the lower end is cylindrical. The cleaning structure is located between the waste heat exchange cylinder and the exhaust gas cylinder, and includes a scraper, a temperature-sensing cylinder, and a transmission component. The scraper is vertically mounted on the exhaust gas cylinder and rotatable around a first axis, located on one side of the outer peripheral wall of the waste heat exchange cylinder. The temperature-sensing cylinder is located at the lower end of the exhaust gas cylinder and includes a drive piston. The drive piston is rotatable and can slide up and down inside the temperature-sensing cylinder. The transmission component and the exhaust gas cylinder are connected by a threaded connection. The cleaning structure is configured such that when the outer peripheral wall of the waste heat exchange cylinder is covered with soot, causing the temperature difference between the upper and lower ends of the exhaust gas cylinder to decrease, the gas in the temperature-sensing cylinder expands due to heat, pushing the drive piston to cause the transmission component to drive the scraper to rotate around the first axis to scrape off the soot. A balance cylinder is located at the upper end of the exhaust gas cylinder. A balance piston that can slide up and down and rotate is located inside the balance cylinder. A balance spring is located on the lower side of the balance piston. One end of the balance spring is connected to the balance piston, and the other end is connected to the drive piston, used to cause the drive piston to reset and balance after the heat exchange rate of the waste heat exchange cylinder recovers.

2. The chemical waste gas waste heat recovery device according to claim 1, characterized in that: The transmission components include a transmission ring, a rotating ring, a synchronizing element, a transmission rod, and a limiting structure; The transmission ring axis coincides with the first axis and is located at the lower end of the exhaust gas cylinder, and is located above the temperature sensing cylinder; a protrusion is provided on the outer peripheral wall of the transmission ring; a spiral groove is provided on the inner peripheral wall of the exhaust gas cylinder; the protrusion is slidably installed in the spiral groove. The axis of the rotating ring coincides with the first axis; the rotating ring is rotatably disposed inside the transmission ring; a torsion spring is provided between the rotating ring and the transmission ring; The synchronizing element is located between the rotating ring and the scraper rod, and is used to drive the scraper rod to rotate synchronously around the first axis when the rotating ring rotates; The transmission rod is located between the rotating ring and the drive piston, with one end connected to the rotating ring and the other end connected to the drive piston; The limiting structure is located between the rotating ring and the waste heat exchange cylinder. It is used to lock the rotating ring from rotating with the transmission ring when the driving piston drives the transmission ring to move up and rotate along the spiral groove so that the torsion spring can store force. When the transmission ring rises to the preset position, the rotating ring is unlocked so that the torsion spring can release force.

3. The chemical waste gas waste heat recovery device according to claim 2, characterized in that: The limiting structure includes a limiting groove and a limiting block; The limiting groove is arranged radially on the transmission ring along the waste heat exchange cylinder; The limiting block is slidably disposed between the waste heat exchange cylinder and the transmission ring along the radial direction of the waste heat exchange cylinder; a limiting spring is provided between the limiting block and the waste heat exchange cylinder; the limiting block is locked in the limiting groove, and is used to stop the rotation of the rotating ring by engaging with the limiting groove when the driving piston drives the transmission ring to rotate; when the transmission ring rises to the preset position, it disengages from the limiting groove to unlock the rotating ring so that the torsion spring drives the rotating ring to rotate.

4. The chemical waste gas waste heat recovery device according to claim 3, characterized in that: Synchronizing components include a synchronizing ring and a synchronizing rod; The synchronizing ring is sleeved on the outside of the waste heat exchange cylinder with its axis coinciding with the first axis; the synchronizing ring is rotatably mounted on the inner wall of the waste gas pipe; the scraper is mounted on the synchronizing ring; The synchronizing rod is located between the synchronizing ring and the rotating ring, with one end connected to the synchronizing ring and the other end connected to the rotating ring.

5. The chemical waste gas waste heat recovery device according to claim 4, characterized in that: The cleaning structure also includes a damping cylinder; The damping cylinder is located between the synchronizing ring and the rotating ring; the outer shell of the damping cylinder is fixed on the waste heat exchange cylinder, and the damping piston is rotatably mounted on the waste heat exchange cylinder; a damping connecting rod is provided on the lower side of the damping cylinder; One end of the damping link is connected to the damping piston, and the other end is connected to the rotating ring.

6. A chemical waste gas waste heat recovery device according to any one of claims 1-5, characterized in that: The synchronizing ring is equipped with sieve holes; A dust collection cylinder is fixed to the inner wall of the exhaust gas stack; the dust collection cylinder is funnel-shaped with the small end facing down; the outer peripheral wall of the dust collection cylinder is attached to the inner peripheral wall of the exhaust gas stack. The lower end of the ash collection cylinder is equipped with an ash-blocking ring; The outer end of the dust-blocking ring is inclined downward and connected to the lower end of the dust collection cylinder; the inner end abuts against the synchronization ring.

7. A chemical waste gas waste heat recovery device according to claim 6, characterized in that: The cleaning structure also includes an adjustment structure; the adjustment structure is used to keep the scraper away from the waste heat exchange cylinder when the heat exchange rate of the waste heat exchange cylinder is normal, and to drive the scraper to stick to the waste heat exchange cylinder when the heat exchange rate of the waste heat exchange cylinder decreases.

8. A chemical waste gas waste heat recovery device according to claim 7, characterized in that: The adjustment structure includes an adjustment groove, an adjustment rod, and an adjustment cylinder; The adjusting groove is arranged radially on the synchronous ring; the scraper is slidably installed in the adjusting groove, and a return spring is connected between the scraper and the adjusting groove; the return spring is used to return the scraper to the end of the adjusting groove away from the waste heat exchange cylinder; The adjusting cylinder is coaxially mounted on the upper end of the transmission ring; the adjusting cylinder is funnel-shaped with the smaller end facing down. The adjusting rod is horizontally positioned between the scraper and the adjusting cylinder; the adjusting rod is slidably mounted on the lower end of the scraper along the radial direction of the synchronizing ring; an adjusting spring is connected between the adjusting rod and the scraper to ensure that the adjusting rod always abuts against the inner circumferential wall of the adjusting cylinder.

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