Waste heat recovery device for heat treatment furnace of low-temperature tough Ni-Mo-Cr series steel

Abstract

The invention relates to the technical field of metal heat treatment, in particular to a heat treatment furnace waste heat recovery device for low-temperature ductile Ni-Mo-Cr series steel, which comprises a shell and further comprises a cleaning mechanism arranged in the inner wall of the shell; the filtering mechanism is arranged in the inner wall of the shell; the cleaning opening is formed in the outer wall of the bottom end of the shell; the heat exchange pipe is fixedly connected into the inner wall of the shell, and the outer wall of the shell is fixedly connected with an air inlet pipe; wherein the cleaning mechanism comprises a motor, and an output shaft of the motor is fixedly connected with a reciprocating screw rod; the filtering mechanism comprises a filter screen, and the inner wall of the filter screen is connected with a convex block in a sliding manner; the outer wall of the reciprocating screw rod is in threaded connection with a moving block; through the arrangement of the cleaning mechanism, an operator does not need to manually clean impurities in the filter screen and the shell, the working intensity is relieved, and the efficiency of maintaining the interior of the shell is also improved.

Description

Technical Field

[0001] The present application relates to the field of metal heat treatment technology, and in particular to a waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel. Background Art

[0002] At present, heat treatment furnaces for low-temperature toughness Ni-Mo-Cr steel are usually industrial furnace equipment used to perform heat treatment processes such as annealing, quenching, and tempering on such steels to improve their low-temperature toughness and other properties. They need to meet requirements such as precise temperature control and uniform heating. Their heat treatment processes have high energy consumption and urgently need efficient waste heat recovery technology to reduce production costs. The waste heat recovery device of the heat treatment furnace is an equipment system that is equipped with the heat treatment furnace and recovers waste heat resources such as high-temperature flue gas discharged from the furnace through heat exchange and other means, and reuses the recovered heat to preheat air, heating medium or other process links to improve energy utilization efficiency and reduce energy consumption.

[0003] During the heat treatment process, if solid fuel is used or the fuel contains a lot of impurities, a lot of solid particles such as coal ash may be generated. The solid particles will be discharged into the waste heat recovery device along with the high-temperature exhaust gas. In addition, process factors such as oxide scale on the surface of steel, lubricant residue or peeling of refractory materials in the furnace may also cause a small amount of condensed solid particles to be mixed in the exhaust gas. After these solid particles pass through the waste heat recovery device, if they cannot be effectively intercepted in the device, they will be discharged simultaneously when the exhaust gas is discharged from the waste heat recovery device, causing impact on the environment. In some existing technologies, in order to avoid the discharge of solid particle impurities, a filter will be set in the waste heat recovery device. After long-term use, a lot of impurities will adhere to the surface of the filter, and since the impurities are relatively light, they may fly inside the device, and the filter and the inside of the device need to be cleaned. However, some existing technologies cannot automatically achieve the cleaning effect, and the operator needs to manually clean the filter and the device, which is more troublesome and increases the work intensity.

[0004] In view of the above-mentioned related technologies, a waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel is proposed. Summary of the Invention

[0005] The purpose of this application is to provide a waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel.

[0006] The present application provides a waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel, which adopts the following technical solution: A waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel comprises a shell, and also includes: a cleaning mechanism, which is arranged in the inner wall of the shell; a filtering mechanism, which is arranged in the inner wall of the shell; a cleaning port, which is arranged on the bottom outer wall of the shell; a heat exchange pipe, which is fixedly connected to the inner wall of the shell, and the outer wall of the shell is fixedly connected to an air intake pipe; the filter in the filtering mechanism can intercept particulate impurities in high-temperature exhaust gas, and the cleaning mechanism can automatically clean solid particulate impurities attached to the surface of the filter, and scrape the cleaned solid particles into the cleaning port through a scraper. The operator can centrally process the impurities through the cleaning port, and there is no need to manually clean the filter and the inner wall of the shell, which is more convenient.

[0007] Wherein, the cleaning mechanism includes a motor, the output shaft of the motor is fixedly connected to a reciprocating screw rod; the filtering mechanism includes a filter screen, the inner wall of the filter screen is slidably connected to a protrusion.

[0008] Preferably, the outer wall of the reciprocating screw is threadedly connected to a moving block, the outer wall of the moving block is rotatably connected to a soft brush, the outer wall of the moving block is fixedly connected to a nozzle, the outer wall of the nozzle is fixedly connected to a water pipe, the outer wall of the soft brush is fixedly connected to a gear, the inner wall of the shell is fixedly connected to a rack, the outer wall of the moving block is fixedly connected to a guide block B, the outer wall of the bottom end of the guide block B is hinged to a scraper through a hinged rod, the outer wall of the scraper is fixedly connected to a guide block A, the inner wall of the shell is provided with a slide groove A, and the inner wall of the shell is provided with a slide groove B.

[0009] Preferably, the motor is fixedly connected to the top outer wall of the shell, the reciprocating screw is rotatably connected to the bottom inner wall of the shell, and the guide block A is slidably connected to the slide groove A.

[0010] Preferably, the guide block B is slidably connected to the inner wall of the slide groove B, the gear is meshed with the rack, and the gear is in contact with the inner wall of the housing.

[0011] Preferably, one end of the hinged rod is hinged to the outer wall of the scraper, and the other end of the hinged rod is hinged to the outer wall of the bottom end of the guide block B.

[0012] Preferably, the scraper is slidably connected to the inner wall of the bottom end of the shell, the water pipe passes through the top outer wall of the shell, and the reciprocating screw passes through the top outer wall of the shell.

[0013] Preferably, the protrusion is elastically connected to the inner wall of the filter through an elastic member, the inner wall of the filter is rotatably connected to a runner, the outer wall of the runner is wrapped with a pull rope, the top outer wall of the filter is fixedly connected to a handle, the outer wall of the handle is slidably connected to a partition, and the inner wall of the shell is provided with a groove; the setting of the filtering mechanism allows the filter to be released and taken out by pulling the partition when the filter needs to be taken out for deep cleaning or direct replacement, and when the filter is placed inside the shell after replacement, the filter can be fixed by engaging the protrusion with the groove, and there is no need to disassemble and install it by turning the bolts multiple times, which is more convenient and quick.

[0014] Preferably, the filter screen contacts the inner wall of the shell, and the protrusion is engaged with the groove.

[0015] Preferably, one end of the elastic member is fixedly connected to the outer wall of the protrusion, and the other end of the elastic member is fixedly connected to the inner wall of the filter.

[0016] Preferably, one end of the pull rope is fixedly connected to the outer wall of the protrusion, and the other end of the pull rope is fixedly connected to the outer wall of the partition.

[0017] In summary, this application includes at least one of the following beneficial technical effects: 1. The present invention adopts the setting of the cleaning mechanism, and the outer wall of the heat exchange tube is coated with a corrosion-resistant coating made of a ceramic-based composite material, and is made of stainless steel, which can avoid the problem of equipment damage caused by a large amount of corrosive components in the high-temperature exhaust gas of the heat treatment of the low-temperature toughness Ni-Mo-Cr series steel; after the high-temperature exhaust gas of the heat treatment of the low-temperature toughness Ni-Mo-Cr series steel passes through the shell and is discharged, the solid particle impurities in the exhaust gas will be intercepted by the filter and remain on the surface of the filter. By starting the motor, the reciprocating screw is driven to rotate, which can drive the moving block to move back and forth vertically, driving the soft brush and the nozzle to move synchronously. The soft brush is moved back and forth through the gear during the reciprocating movement. The scraper rotates with the influence of the rack to scrape off the dust attached to the surface of the filter, and the nozzle can spray water on the surface of the filter during movement to settle the scraped dust to the bottom of the shell to prevent it from flying inside the shell. During the cleaning process, the scraper is driven by the hinged rod to move back and forth along the bottom of the shell to push the dust scraped from the bottom of the shell into the cleaning port. The dust moves downward along the inclined surface of the cleaning port. The operator can open the baffle of the cleaning port for centralized cleaning. The operator does not need to manually clean the impurities inside the filter and the shell, which reduces the workload and improves the efficiency of maintenance inside the shell. 2. The present invention provides a filtering mechanism. When the filter is used for a long time and a large amount of impurities are attached to the surface that cannot be completely removed by the cleaning mechanism, affecting the filtering effect, the operator can hold the handle and pull the partition. The pull rope is pulled through the partition to move the protrusion. The protrusion is disengaged from the groove, and the limit of the filter can be released. The filter can be pulled upward and taken out for thorough cleaning. When installing the filter, the partition is also pulled to insert the filter into the shell. The elastic part drives the protrusion to pop out and engage with the groove, so that the filter can be fixed and the installation of the filter is completed. The overall operation is relatively convenient and quick, and there is no need to install and disassemble the filter by turning the bolts multiple times, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 This is a schematic diagram of the shell cross-section and heat exchange tube structure of Example 1 of the present application; Figure 3 This is a schematic diagram of the shell cross-section, soft brush, and nozzle structure of Example 1 of the present application; Figure 4 This is a schematic diagram of the housing cross-section, gear, and rack structure of Example 1 of the present application; Figure 5 This is a schematic cross-sectional view of the cleaning mechanism of Example 1 of the present application; Figure 6 2 is a schematic diagram of the cross-sectional structure of the shell of Example 1 of the present application; Figure 7 This is a schematic diagram of the exploded structure of the filter screen and shell of the second embodiment of the present application. Explanation of the accompanying reference numerals: 1. Shell; 2. Cleaning mechanism; 201. Motor; 202. Reciprocating screw; 203. Moving block; 204. Soft brush; 205. Nozzle; 206. Water pipe; 207. Gear; 208. Rack; 209. Articulated rod; 210. Scraper; 211. Chute A; 212. Chute B; 213. Guide block A; 214. Guide block B; 3. Filtering mechanism; 31. Filter screen; 32. Partition; 33. Handle; 34. Elastic member; 35. Bump; 36. Pull rope; 37. Rotary wheel; 38. Groove; 4. Cleaning port; 5. Heat exchange tube; 6. Air intake pipe. DETAILED DESCRIPTION

[0019] The following combination Figures 1 to 7 , further details of this application are given.

[0020] Example 1 A waste heat recovery device for heat treatment furnace of low temperature toughness Ni-Mo-Cr steel, please refer to Figures 1 to 6, including a shell 1, and also including: a cleaning mechanism 2, the cleaning mechanism 2 is arranged in the inner wall of the shell 1; a filtering mechanism 3, the filtering mechanism 3 is arranged in the inner wall of the shell 1; a cleaning port 4, the cleaning port 4 is arranged on the bottom outer wall of the shell 1; a heat exchange tube 5, the heat exchange tube 5 is fixedly connected to the inner wall of the shell 1, and the outer wall of the shell 1 is fixedly connected to an air intake pipe 6; The cleaning mechanism 2 includes a motor 201 , the output shaft of the motor 201 is fixedly connected to a reciprocating screw 202 ; the filtering mechanism 3 includes a filter screen 31 , the inner wall of the filter screen 31 is slidably connected to a protrusion 35 .

[0021] The above scheme is adopted: the shell 1 is the shell body of the waste heat recovery device of the heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel, and the air inlet pipe 6 is connected to the air outlet of the heat treatment equipment, which can collect the high-temperature exhaust gas generated during the heat treatment of low-temperature toughness Ni-Mo-Cr steel and transport it to the shell 1. The air inlet pipe 6 is fixedly connected to one side of the shell 1, and an air outlet pipe is provided on the opposite side. After the high-temperature exhaust gas enters the shell 1, it can be discharged from the air outlet pipe. Before being discharged, it passes through the filter 31 to intercept and filter the polluted solid particle impurities in the exhaust gas to avoid affecting the environment after being discharged; the outer wall of the heat exchange tube 5 and the inner wall of the air inlet pipe 6 and the air outlet pipe are coated There is a corrosion-resistant coating, which is a ceramic-based composite material. The heat exchange tube 5 is made of stainless steel, which can avoid the problem of damage to the recovery equipment caused by a large amount of corrosive components in the high-temperature exhaust gas of the heat treatment of low-temperature toughness Ni-Mo-Cr steel; both ends of the heat exchange tube 5 pass through the outer wall of the shell 1, one end is the molten iron preheating inlet required for heat treatment, and the other end is the molten iron outlet. After the high-temperature exhaust gas is recovered and passes through the inside of the shell 1, the temperature of the inside of the shell 1 and the heat exchange tube 5 will increase. After the molten iron passes through the spiral heat exchange tube 5, the temperature rises and has a preheating effect. The preheated molten iron is discharged through the outlet of the heat exchange tube 5 to the heat treatment equipment and can be used, thereby completing the recovery and utilization of the waste heat of the high-temperature exhaust gas.

[0022] Reference Figures 1 to 6 The outer wall of the reciprocating screw 202 is threadedly connected to the moving block 203, the outer wall of the moving block 203 is rotatably connected to the soft brush 204, the outer wall of the moving block 203 is fixedly connected to the nozzle 205, the outer wall of the nozzle 205 is fixedly connected to the water pipe 206, the outer wall of the soft brush 204 is fixedly connected to the gear 207, the inner wall of the shell 1 is fixedly connected to the rack 208, the outer wall of the moving block 203 is fixedly connected to the guide block B214, the outer wall of the bottom end of the guide block B214 is hinged to the scraper 210 through the hinge rod 209, the outer wall of the scraper 210 is fixedly connected to the guide block A213, the inner wall of the shell 1 is provided with a slide groove A211, and the inner wall of the shell 1 is provided with a slide groove B212.

[0023] Adopting the above scheme: when the motor 201 is started, its output shaft drives the reciprocating screw 202 to rotate, and the bottom end of the reciprocating screw 202 is rotatably connected to the inner wall of the bottom end of the shell 1; the guide block B214 on the outer wall of the moving block 203 is always slidably connected to the inner wall of the slide groove B212, so that the moving block 203 can only move vertically. Since the reciprocating screw 202 is threadedly connected to the inner wall of the moving block 203, the reciprocating screw 202 continuously rotates, and thus drives the moving block 203 to continuously reciprocate vertically; When the moving block 203 moves, it will drive the soft brush 204 to move synchronously. The soft brush 204 and the gear 207 on its outer wall move synchronously. Since the gear 207 is always engaged with the rack 208 in the side wall of the shell 1, when the gear 207 moves back and forth vertically, since the rack 208 is always in a fixed state, its outer wall tooth block will generate resistance to the outer wall tooth block of the gear 207, causing the gear 207 to rotate continuously while moving, thereby driving the soft brush 204 to rotate continuously on the outer wall of the moving block 203.

[0024] Reference Figures 1 to 6 During the reciprocating movement of the moving block 203, the nozzle 205 will also be driven to move up and down synchronously. Since the lower part of the water pipe 206 is a telescopic hose, it will not affect the movement of the nozzle 205. The water pipe 206 will stretch and contract when the nozzle 205 moves; the water pipe 206 can be connected to an external device to deliver water to the nozzle 205. The opening of the nozzle 205 is always facing the filter 31. During the movement, it can continuously spray water on the surface of the filter 31, and can spray water up and down with the moving block 203. Combined with the up and down movement and rotation of the soft brush 204, it has a better cleaning effect on the filter 31, sweeping away fixed particle impurities attached to its surface while spraying water, and the water spraying can settle lighter impurities such as dust, so that they settle to the bottom of the shell 1 without flying inside the shell 1.

[0025] Reference Figures 1 to 6 The motor 201 is fixedly connected to the top outer wall of the shell 1, the reciprocating screw 202 is rotatably connected to the bottom inner wall of the shell 1, and the guide block A213 is slidingly connected to the slide groove A211; the guide block B214 is slidingly connected to the inner wall of the slide groove B212, the gear 207 is engaged with the rack 208, and the gear 207 contacts the inner wall of the shell 1; one end of the hinged rod 209 is hinged to the outer wall of the scraper 210, and the other end of the hinged rod 209 is hinged to the bottom outer wall of the guide block B214; the scraper 210 is slidingly connected to the bottom inner wall of the shell 1, the water pipe 206 passes through the top outer wall of the shell 1, and the reciprocating screw 202 passes through the top outer wall of the shell 1.

[0026] The above scheme is adopted: during the reciprocating vertical movement of the moving block 203, the hinged rod 209 and one end hinged with the guide block B214 will be driven to move up and down synchronously. Since the other end of the hinged rod 209 is hinged to the top outer wall of the scraper 210, and the scraper 210 is slidably connected to the inner wall of the bottom end of the shell 1, and the guide block A213 on the outer wall of the scraper 210 always slides in the inner wall of the slide groove A211, so that the scraper 210 can only move laterally at the bottom of the shell 1, so that the hinged rod 209 will flip when it moves, and its bottom end drives the scraper 210 to move laterally along the bottom of the shell 1, and the scraper 210 can scrape the dust and other impurities at the bottom of the shell 1 by the soft brush 204. The scraper 210 is used to scrape and clean the dust, and in the process of scraping the dust, the dust will be pushed to the cleaning port 4; the cleaning port 4 is provided with an inclined surface inside, and a baffle is provided on the outer wall, which can be opened and closed. After the dust is pushed into the cleaning port 4, it will move downward along its inclined surface. The operator can open the baffle to centrally clean the dust on the inclined surface of the cleaning port 4, thereby facilitating the cleaning operation of the dust inside the shell 1. While the soft brush 204 of the cleaning mechanism 2 continuously cleans the filter 31 and the nozzle 205 sprays water to clean the filter 31, the scraper 210 can automatically scrape the dust at the bottom for centralized processing, without the need for the operator to perform additional cleaning, thereby reducing the work intensity.

[0027] Example 2 Reference Figure 7 The protrusion 35 is elastically connected to the inner wall of the filter 31 through an elastic member 34. The inner wall of the filter 31 is rotatably connected to a wheel 37. A pull rope 36 is wrapped around the outer wall of the wheel 37. The top outer wall of the filter 31 is fixedly connected to a handle 33. The outer wall of the handle 33 is slidably connected to a partition 32. A groove 38 is provided on the inner wall of the shell 1.

[0028] The above scheme is adopted: the filter screen 31 is detachably installed in the inner wall of the shell 1. When the filter screen 31 is used for a long time, a large amount of impurities that cannot be thoroughly cleaned by the cleaning mechanism 2 are attached to the surface, seriously affecting the filtering effect, the handle 33 can be pulled to remove the filter screen 31 upward for further maintenance or replacement; the protrusion 35, elastic member 34, pull rope 36, and rotating wheel 37 are each provided with two groups, symmetrically distributed on the inner walls on both sides of the filter screen 31. The elastic member 34 is a spring, which is the existing technology. Under normal circumstances, the elastic member 34 keeps the protrusion 35 in a certain position due to its own elastic force. At this time, the protrusion 35 can be engaged with the groove 38 to fix the filter screen 31 in the inner wall of the shell 1; the pull rope 36 is always in contact with the outer wall of the rotating wheel 37, and the two groups of pull ropes 36 are fixedly connected to the bottom outer wall of the partition 32.

[0029] Reference Figure 7The filter screen 31 contacts the inner wall of the shell 1, and the protrusion 35 is engaged with the groove 38; one end of the elastic member 34 is fixedly connected to the outer wall of the protrusion 35, and the other end of the elastic member 34 is fixedly connected to the inner wall of the filter screen 31; one end of the pull rope 36 is fixedly connected to the outer wall of the protrusion 35, and the other end of the pull rope 36 is fixedly connected to the outer wall of the partition 32.

[0030] The above solution is adopted: when holding the handle 33 and pulling the partition 32, the partition 32 will drive the pull rope 36 and its fixed end to move upward synchronously. When the pull rope 36 moves, it will move along the outer wall of the rotating wheel 37. The sliding friction between the two is converted into rolling friction, which reduces the wear of the pull rope 36; and the rotating wheel 37 will cause the pull rope 36 to change the pulling direction. The other end of the pull rope 36 will pull the protrusion 35 fixed to it to move, so that the two groups of protrusions 35 move toward the middle at the same time and compress the elastic member 34. At this time, the protrusion 35 can be disengaged from the groove 38, and the limit of the filter screen 31 can be released. When the filter 31 is installed, the handle 33 is also held and the partition 32 is pulled upward so that the two sets of protrusions 35 move to the inner wall of the filter 31, and the filter 31 is then inserted into the shell 1 so that the positions of the protrusions 35 and the grooves 38 correspond. Then, the partition 32 is loosened, and the elastic member 34 drives the protrusions 35 to pop out to both sides due to its own elastic force and engage with the grooves 38, thereby completing the fixation of the filter 31. There is no need to repeatedly turn the bolts to disassemble and install it, which is more convenient, quick, and saves time and effort.

[0031] The working principle and use process of the present invention: The high-temperature exhaust gas generated by the heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel enters the shell 1 through the air inlet pipe 6. The exhaust gas contains corrosive components and waste heat energy. The exhaust gas flows through the outside of the spiral heat exchange tube 5 and exchanges heat with the molten iron in the tube through the stainless steel tube wall of the heat exchange tube 5. The ceramic-based corrosion-resistant coating on the inner and outer walls of the heat exchange tube 5 prevents exhaust gas corrosion. At the same time, the spiral structure prolongs the residence time of the molten iron and enhances the preheating effect.

[0032] The molten iron flows along a spiral path, absorbing heat from the high-temperature exhaust gas in the shell 1, and its temperature gradually increases; the preheated molten iron is discharged from the outlet at the other end of the heat exchange tube 5 and returned to the heat treatment furnace for use, thereby realizing waste heat recovery and utilization; the exhaust gas that has completed the heat exchange continues to flow, and when passing through the filter 31, solid particle impurities such as oxide scale and dust are intercepted, and the clean exhaust gas is discharged from the exhaust pipe, reducing environmental pollution.

[0033] While exhaust gas is being discharged, the motor 201 can be started to drive the reciprocating screw 202 to rotate, and the moving block 203 can be moved back and forth vertically along the inner wall of the shell 1 through threaded transmission. The guide block B214 slides in the slide groove B212 to guide the moving trajectory of the moving block 203. The moving block 203 drives the soft brush 204 to move synchronously. At the same time, the gear 207 engages with the fixed rack 208, forcing the gear 207 to rotate while moving, thereby driving the soft brush 204 to rotate and brush the surface of the filter 31 to remove attached particulate impurities.

[0034] The moving block 203 will also drive the nozzle 205 to move up and down, connect to the external water source through the water pipe 206, and spray water onto the surface of the filter 31. The water pipe 206 will continuously stretch and contract during the movement of the nozzle 205. The water spraying and the rotating brush scrubbing form a synergistic effect. The water flow settles light dust, and the brush mechanically peels off stubborn impurities. The clean waste liquid and impurities fall to the bottom of the shell 1.

[0035] When the moving block 203 moves back and forth vertically, it flips through the hinged rod 209, driving the scraper 210 to move back and forth continuously. The lateral movement of the scraper 210 pushes the dust, waste liquid and other impurities at the bottom of the shell to the cleaning port 4. The inclined surface design inside the cleaning port facilitates the accumulation of impurities. The operator can regularly open the baffle of the cleaning port 4 and use the inclined surface to guide the impurities out to complete the cleaning without dead angles. There is no need for manual cleaning of the inside of the shell, which reduces labor intensity and is more convenient to use.

[0036] After long-term use, the surface of the filter 31 may be unable to be completely cleaned by the cleaning mechanism 2 due to excessive impurities attached, which affects the filtering effect. At this time, the operator can hold the handle 33, pull the partition 32 upward, and use the pull rope 36 to drive the two sets of protrusions 35 to compress the elastic part 34, so that the protrusions 35 are disengaged from the grooves 38 on the inner wall of the shell 1, thereby releasing the fixation of the filter 31; continue to pull the handle 33 to remove the filter 31 from the top of the shell 1, and deeply clean the stubborn impurities on the surface or directly replace the filter.

[0037] After cleaning or replacement, the cleaned or new filter 31 can be inserted into the shell 1, and the partition 32 can be loosened after aligning it with the groove 38. The elastic member 34 will reset and push the protrusion 35 into the groove 38 to complete the automatic locking. No bolt fixing is required, which improves maintenance efficiency. The installation and disassembly operations are more convenient and quick, saving time and effort.

[0038] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel, comprising a shell (1), characterized in that: Also includes: A cleaning mechanism (2), the cleaning mechanism (2) being arranged in the inner wall of the housing (1); A filtering mechanism (3), the filtering mechanism (3) being arranged in the inner wall of the housing (1); A cleaning port (4), the cleaning port (4) being arranged on the outer wall of the bottom end of the shell (1); A heat exchange tube (5), the heat exchange tube (5) being fixedly connected to the inner wall of the shell (1), and an air intake pipe (6) being fixedly connected to the outer wall of the shell (1); Wherein, the cleaning mechanism (2) comprises a motor (201), and the output shaft of the motor (201) is fixedly connected to a reciprocating screw rod (202); The filtering mechanism (3) comprises a filter screen (31), and a protrusion (35) is slidably connected to the inner wall of the filter screen (31).

2. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 1, characterized in that: The outer wall of the reciprocating screw (202) is threadedly connected to a moving block (203), the outer wall of the moving block (203) is rotatably connected to a soft brush (204), the outer wall of the moving block (203) is fixedly connected to a nozzle (205), the outer wall of the nozzle (205) is fixedly connected to a water pipe (206), the outer wall of the soft brush (204) is fixedly connected to a gear (207), the inner wall of the shell (1) is fixedly connected to a rack (208), the outer wall of the moving block (203) is fixedly connected to a guide block B (214), the outer wall of the bottom end of the guide block B (214) is hinged to a scraper (210) through a hinged rod (209), the outer wall of the scraper (210) is fixedly connected to a guide block A (213), the inner wall of the shell (1) is provided with a slide groove A (211), and the inner wall of the shell (1) is provided with a slide groove B (212).

3. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 2, characterized in that: The motor (201) is fixedly connected to the top outer wall of the housing (1), the reciprocating screw (202) is rotatably connected to the bottom inner wall of the housing (1), and the guide block A (213) is slidably connected to the slide groove A (211).

4. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 2, characterized in that: The guide block B (214) is slidably connected to the inner wall of the slide groove B (212), the gear (207) is meshed with the rack (208), and the gear (207) is in contact with the inner wall of the housing (1).

5. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 2, characterized in that: One end of the hinged rod (209) is hinged to the outer wall of the scraper (210), and the other end of the hinged rod (209) is hinged to the outer wall of the bottom end of the guide block B (214).

6. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 2, characterized in that: The scraper (210) is slidably connected to the inner wall of the bottom end of the shell (1), the water pipe (206) passes through the outer wall of the top end of the shell (1), and the reciprocating screw (202) passes through the outer wall of the top end of the shell (1).

7. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 1, characterized in that: The protrusion (35) is elastically connected to the inner wall of the filter (31) through an elastic member (34); the inner wall of the filter (31) is rotatably connected to a rotating wheel (37); a pull rope (36) is wound around the outer wall of the rotating wheel (37); a handle (33) is fixedly connected to the outer wall of the top end of the filter (31); a partition (32) is slidably connected to the outer wall of the handle (33); and a groove (38) is provided on the inner wall of the housing (1).

8. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 7, characterized in that: The filter screen (31) contacts the inner wall of the housing (1), and the protrusion (35) is engaged with the groove (38).

9. The waste heat recovery device for a heat treatment furnace of low-temperature toughness Ni-Mo-Cr steel according to claim 7, characterized in that: One end of the elastic member (34) is fixedly connected to the outer wall of the protrusion (35), and the other end of the elastic member (34) is fixedly connected to the inner wall of the filter screen (31).

10. The waste heat recovery device for a heat treatment furnace of low temperature toughness Ni-Mo-Cr steel according to claim 7, characterized in that: One end of the pull rope (36) is fixedly connected to the outer wall of the protrusion (35), and the other end of the pull rope (36) is fixedly connected to the outer wall of the partition (32).

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