Combustion equipment for spent sulfuric acid cracking with waste heat recovery function

Abstract

The application discloses a waste sulfuric acid cracking combustion equipment with waste heat recovery function, which comprises a body, a burner is installed on one side of the bottom of the body, a grinding seat and two first roller cylinders are arranged in the body, the grinding seat is arranged between the two first roller cylinders, a first motor is arranged above the body, and the first motor drives the two first roller cylinders to rotate. The body is internally provided with a scraping mechanism. The scraping mechanism can scrape off the powder impurities adhered to the surface of the first roller cylinder and the waste sulfuric acid when the first roller cylinder is crushing the solid impurities in the waste sulfuric acid, so that the service life of the first roller cylinder is prolonged, and a secondary grinding mechanism is further arranged in the body. The solid impurities which are difficult to be crushed by the first roller cylinder and the grinding seat can be crushed again, so that the volume of the solid impurities is small enough, so that the waste sulfuric acid and the solid impurities can be fully combusted.

Description

Technical Field

[0001] This invention relates to the field of chemical environmental protection technology, specifically to a combustion device for the cracking of waste sulfuric acid with waste heat recovery function. Background Technology

[0002] Acetylene gas is produced using a dry acetylene process with calcium carbide as a solid impurity. During production, concentrated sulfuric acid is used to purify the acetylene gas. After purification, the 98% concentrated sulfuric acid, when its concentration is below 80%, must be discharged from the unit, generating a large amount of waste sulfuric acid annually. This waste sulfuric acid contains various impurities such as hydrocarbon carbides, elemental sulfur, sulfurous acid, sulfuric acid, and phosphoric acid. It is black and viscous, with a pungent acidic odor and a foul smell, severely impacting the environment and causing significant difficulties in transportation and utilization. Publication number "CN205442638U" discloses a waste sulfuric acid pyrolysis furnace employing low-NOx combustion. Its features include: a horizontal structure, with the furnace length and pipe opening size determined by the overall scale of the acid production system; the furnace cavity is divided into three sections: a front section (low-NOx combustion chamber), a middle section (furnace gas mixing chamber), and a rear section (high-temperature oxidation chamber); the furnace includes an external insulation layer, a shell, a heat insulation layer, and a refractory and acid-resistant layer; the furnace shell includes a cylinder, end plates, and supports. The greatest advantages of this device are energy saving, environmental friendliness, high efficiency, and safe and stable operation. However, the above solution still has the following drawbacks: 1. Because there are some solid impurities in waste sulfuric acid, these solid impurities require a long time to burn completely when subjected to high-temperature combustion. However, in the existing technology, these solid impurities are also crushed by crushing rollers. However, because waste sulfuric acid is relatively viscous, some waste sulfuric acid will stick to the surface of the rollers and is not easy to remove, which leads to a reduction in the service life of the crushing rollers. 2. Waste sulfuric acid loses most of its heat during combustion, and this heat is difficult to recover and reuse. Furthermore, waste sulfuric acid requires preheated air to assist combustion during pyrolysis and combustion. On one hand, there is heat loss, and on the other hand, an additional heat source is needed to preheat the air. Over time, this will increase the overall cost of waste sulfuric acid pyrolysis. Summary of the Invention

[0003] The purpose of this invention is to provide a combustion device for the cracking of waste sulfuric acid with waste heat recovery function, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A combustion device for pyrolyzing waste sulfuric acid with waste heat recovery function includes a machine body, a burner installed on one side of the bottom of the machine body, a grinding seat and two first rollers arranged inside the machine body, the grinding seat being arranged between the two first rollers, and a first motor arranged above the machine body. The first motor drives the two first rollers to rotate, so that the waste sulfuric acid is pulverized in the gap between the first rollers and the grinding seat. The machine body is equipped with a scraping mechanism for cleaning the first roller. The scraping mechanism includes a traction block, a bracket, an arc-shaped scraper, a guide rod, and a hopper. The traction block is reciprocally mounted inside the grinding seat. The bracket is elastically connected to the bottom of the traction block. The arc-shaped scraper is mounted on the top of the bracket. The guide rod is elastically connected to the side wall of the bracket. The hopper is tilted below the bracket. The arc-shaped scraper reciprocates at the bottom of the first roller through a guide groove. The laterally resetting arc-shaped scraper can scrape off solid impurities and waste sulfuric acid adhering to the surface of the first roller and make them fall into the hopper, where they are then subjected to secondary grinding as the hopper moves.

[0005] As a preferred method of the present invention, the machine body is further provided with a secondary grinding mechanism, which includes a screen, a second roller, a groove, a worm gear, and a worm. The screen is fixed inside the machine body and is divided into a horizontal part, an inclined part, and a grinding part. The groove is provided on the surface of the grinding part. The two second rollers rotate on the inner wall of the groove through gear transmission. The worm gear is fixed on the surface of one of the second rollers. The worm rotates on the inner wall of the machine body and is connected to the worm gear. The input end of the worm is connected to one of the first rollers through belt transmission.

[0006] As a preferred method of the present invention, the machine body is further provided with a knocking mechanism for cleaning the screen. The knocking mechanism includes a crankshaft, a connecting frame and a hinge plate. The crankshaft is connected to a reciprocating lead screw inside the grinding seat. The connecting frame is located directly below the grinding seat. The hinge plate connects the top of the connecting frame to the eccentric part of the crankshaft. A second motor is fixed to the side wall of the machine body. The output end of the second motor is connected to the reciprocating lead screw. When the reciprocating lead screw rotates in one direction, it can drive the crankshaft to rotate synchronously. The crankshaft, in turn, drives the connecting frame to move vertically back and forth through the hinge plate, so that the connecting frame can strike the screen when it moves to the lowest point.

[0007] As a preferred method of the present invention, the guide groove is disposed on the inner wall of the grinding seat and is connected to the guide rod. The guide groove is divided into an inclined section, a horizontal section and a reset section, and the inclined section, the horizontal section and the reset section are connected end to end to form a triangle.

[0008] As a preferred method of the present invention, the end of the reset segment and the beginning of the tilt segment are transitioned by an arc surface, the depth of the tilt segment gradually becomes shallower along the direction closer to the center of the body, and the depth of the horizontal segment is greater than the shallowest point of the tilt segment.

[0009] As a preferred method of the present invention, the connecting frame is provided with a gap cleaning structure, the gap cleaning structure including a driving block, a gap scraper, a limiting rod, a limiting groove and a guide groove. The driving block is movably disposed on the surface of the connecting frame, the gap scraper is elastically movably disposed above the driving block, the limiting rod vertically penetrates through the two driving blocks, the limiting groove is disposed on the surface of the connecting frame, the guide groove is disposed on the inner wall of the machine body, and the two ends of the limiting rod extend into the interior of the two guide grooves respectively.

[0010] As a preferred method of the present invention, the first motor is connected to one of the first rollers by belt drive, and the two first rollers are connected by gear drive.

[0011] As a preferred method of the present invention, the interior of the machine body is provided with a waste heat recovery mechanism, which includes a heat exchange box, a recovery pipe, a connecting pipe, an air inlet pipe, and a circulation pipe. The heat exchange box is located on one side of the machine body and is connected to the machine body through the recovery pipe. The surface of the heat exchange box is provided with a connecting pipe, and the surface of the heat exchange box is also provided with an air inlet pipe and a circulation pipe. One end of the circulation pipe is connected to the interior of the machine body, and the other end of the circulation pipe is connected to the air inlet pipe inside the heat exchange box through a pipe.

[0012] This invention utilizes a scraping mechanism to scrape off powdery impurities and waste sulfuric acid adhering to the surface of the first roller during the crushing of solid impurities in the waste sulfuric acid. This prevents the waste sulfuric acid from adhering to the surface of the first roller and reducing its service life. Furthermore, a secondary grinding mechanism is installed inside the machine body to further crush solid impurities that are difficult to crush by the first roller and grinding seat, thereby reducing the volume of solid impurities to a sufficiently small size so that the waste sulfuric acid and solid impurities can be fully combusted. Since the scraping mechanism relies on two arc-shaped scrapers that are close to or far apart from each other to clean the first roller, there is a gap between the two arc-shaped scrapers. This results in an annular area on the surface of the first roller that cannot be cleaned, which is equal in width to the gap. Therefore, a gap cleaning structure is installed on the connecting frame to clean the gap between the two arc-shaped scrapers, thereby achieving a thorough cleaning of the first roller. This invention collects the heat generated during the combustion of waste sulfuric acid and solid impurities through a waste heat recovery mechanism. This heat is then used to preheat ambient air, which is then introduced into the machine to aid the combustion of waste sulfuric acid and solid impurities, thereby reducing the pyrolysis cost of waste sulfuric acid.

[0013] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the body of the present invention; Figure 3 This is a schematic diagram of the main structure of the secondary grinding mechanism of the present invention; Figure 4 This is a schematic diagram of the main structure of the screen of the present invention; Figure 5 This is a schematic diagram of the main structure of the scraping mechanism of the present invention; Figure 6 This is a schematic diagram of the main structure of the gap cleaning mechanism of the present invention; Figure 7 This is a schematic diagram of the main structure of the guide groove of the present invention; Figure 8 This is a schematic diagram of the guide groove of the present invention.

[0015] In the diagram: 1. Machine body; 2. Burner; 3. Grinding base; 4. First roller; 5. First motor; 6. Scraper mechanism; 601. Traction block; 602. Support; 603. Arc-shaped scraper; 604. Guide rod; 605. Hopper; 606. Guide groove; 6061. Inclined section; 6062. Horizontal section; 6063. Reset section; 7. Secondary grinding mechanism; 701. Screen; 7011. Horizontal section; 7012. Inclined section; 7013. Grinding section; 702. Second roller; 703. 704. Groove; 705. Worm; 8. Striking mechanism; 801. Crankshaft; 802. Connecting frame; 803. Hinge plate; 9. Gap cleaning structure; 901. Drive block; 902. Gap scraper; 903. Limiting rod; 904. Limiting groove; 905. Guide groove; 10. Waste heat recovery mechanism; 1001. Heat exchange box; 1002. Recovery pipe; 1003. Connecting pipe; 1004. Inlet pipe; 1005. Circulation pipe; 11. Second motor; 12. Reciprocating lead screw. Detailed Implementation

[0016] 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.

[0017] Please refer to Figure 1-8 The present invention provides an embodiment: Please see Figure 1 and 2 Inside the machine body 1, there is a grinding seat 3 and two first rollers 4. The grinding seat 3 is located between the two first rollers 4, and the two first rollers 4 are connected by gear transmission. A first motor 5 is located above the machine body 1. The first motor 5 is connected to one of the first rollers 4 by belt transmission. The first motor 5 drives the two first rollers 4 to rotate, so that waste sulfuric acid and solid impurities are ground in the gap between the first rollers 4 and the grinding seat 3.

[0018] During the grinding process of waste sulfuric acid and solid impurities, the waste sulfuric acid, being a liquid, can pass smoothly through the gap between the first roller 4 and the grinding seat 3. However, for solid impurities, the volume decreases due to friction when passing through the gap between the first roller 4 and the grinding seat 3, increasing the contact area between the solid impurities and the waste sulfuric acid at the bottom of the machine body, thus facilitating pyrolysis and combustion. However, these solid impurities are not completely ground by the gap between the first roller 4 and the grinding seat 3, so they can be ground again inside the machine body by the secondary grinding mechanism 7.

[0019] Please see Figure 2 , 3 And 4, a secondary grinding mechanism 7 is provided in the machine body 1, the secondary grinding mechanism 7 includes: Screen 701 is fixed inside the machine body 1. Screen 701 is divided into a horizontal part 7011, an inclined part 7012 and a grinding part 7013. Groove 703, groove 703 is provided on the surface of grinding section 7013; The second roller 702 rotates on the inner wall of the groove 703 via gear transmission; Worm gear 704, worm gear 704 is fixed to the surface of one of the second rollers 702; and The worm 705 rotates on the inner wall of the machine body 1 and is connected to the worm wheel 704. The input end of the worm 705 is connected to one of the first rollers via belt drive.

[0020] The screen 701 can screen the pulverized solid impurities. The solid impurity powder that does not adhere to the first roller 4 will fall directly to the bottom of the machine body 1 through the screen 701 for combustion. The worm 705 can drive the worm wheel 704 to rotate, and then drive the two second rollers 702 to rotate simultaneously through the worm wheel 704, so as to grind the large solid impurities that cannot pass through the screen 701 again, thereby achieving the purpose of thorough grinding.

[0021] When the first roller 4 rotates, it drives the worm 705 to rotate via belt drive. When the worm 705 rotates, it drives the worm wheel 704 to rotate, which in turn drives the two second rollers 702 to rotate simultaneously, so as to perform secondary grinding on large solid impurities that the first roller 4 cannot grind. However, since some large solid impurities will stay or adhere to the surface of the horizontal part 7011 of the screen 701, a scraping mechanism 6 for cleaning the first roller 4 and a tapping mechanism 8 for vibrating the screen 701 are provided inside the machine body 1.

[0022] Please see Figure 5 and 7 The scraping mechanism 6 includes: Traction block 601 is reciprocally mounted inside grinding seat 3; The bracket 602 is flexibly and movably connected to the bottom of the traction block 601; An arc-shaped scraper 603 is disposed on the top of the bracket 602; Guide rod 604 is elastically and movably connected to the side wall of bracket 602; The guide groove 606 is set on the inner wall of the grinding seat 3 and is connected to the guide rod 604. The guide groove 606 is divided into an inclined section 6061, a horizontal section 6062 and a reset section 6063. The end of the reset section 6063 and the beginning of the inclined section 6061 are transitioned by an arc surface. The depth of the inclined section 6061 gradually becomes shallower along the direction close to the center of the machine body 1. The depth of the horizontal section 6062 is greater than the shallowest point of the inclined section 6061. And hopper 605, which is inclinedly disposed below the middle.

[0023] By setting the guide groove 606, the two arc-shaped scrapers 603 can gradually rise as they approach each other until they contact the first roller 4. The advantage of this structure is that when the arc-shaped scrapers 603 move towards the center of the first roller 4, they do not contact the first roller 4 during the movement, so they will not push the waste sulfuric acid and solid impurities adhering to the surface of the first roller 4 to the center of the first roller 4. When the arc-shaped scrapers 603 move in the opposite direction, they always contact the first roller 4, so they can push the waste sulfuric acid and solid impurities adhering to the surface of the first roller 4 to both sides of the first roller 4, thereby achieving the purpose of cleaning the first roller 4.

[0024] Initially, one end of the guide rod 604 is located at the beginning of the inclined section 6061. As the traction block 601 moves towards the center of the machine body 1, the height of the inclined section 6061 continuously increases. At this time, the traction block 601 pulls the support 602 upwards, raising the overall height of the support 602. Simultaneously, the arc-shaped scraper 603 rises synchronously under the drive of the support 602. When the traction block 601 reaches its maximum stroke, the guide rod 604 reaches the end of the inclined section 6061. Under the action of elasticity, the guide rod 604 enters the horizontal section 6062. At the same time, the arc-shaped scraper 603 contacts another arc-shaped scraper 603 on the support 602, and the arc-shaped scraper 603 contacts the bottom of the first roller 4. When the traction block 601 moves in the opposite direction, the support 602 drives the arc-shaped scraper 603 to move in the opposite direction. The guide rod 604 moves along the horizontal section 6062. The laterally reset arc-shaped scraper 603 can scrape off the large solid impurities adhering to the first roller 4 and make them fall into the hopper 605. As the hopper 605 moves, it is guided into the groove 703 for secondary grinding. Throughout the process, when the two arc-shaped scrapers 603 approach each other, the height of the arc-shaped scrapers 603 continuously increases. When the two arc-shaped scrapers 603 are just in contact with each other, the arc-shaped scraper 603 is in contact with the bottom of the first roller 4. When the two arc-shaped scrapers 603 move away from each other, the arc-shaped scraper 603 always contacts the bottom of the first roller 4. Therefore, when cleaning the powder and waste sulfuric acid on the surface of the first roller 4, the waste sulfuric acid will not be repeatedly applied to the first roller 4. Instead, the waste sulfuric acid will be scraped off the surface of the first roller 4 in one direction.

[0025] The arc-shaped scraper 603 can scrape off the powder impurities and waste sulfuric acid adhering to the surface of the waste sulfuric acid when the first roller 4 crushes the solid impurities in the waste sulfuric acid, preventing the waste sulfuric acid from adhering to the surface of the first roller 4 and reducing its service life. This part of the waste sulfuric acid can enter the groove 703 under the guidance of the hopper 605. The waste sulfuric acid and solid impurities that do not adhere to the surface of the first roller 4 will be directly screened through the horizontal part 7011 of the screen 701. Large solid impurities that cannot pass through the screen 701 will remain on the surface of the horizontal part 7011. After being struck by the striking mechanism 8, they will slide down from the inclined part 7012 into the grinding part 7013 under the action of vibration.

[0026] It should be noted that when the traction block 601 is reset, the guide rod 604 moves to the end of the horizontal section 6062. Since the reset section 6063 is vertical, the guide rod 604 will move directly to the beginning of the inclined section 6061 under the action of gravity, thus participating in the next action. During this process, the inner wall of the grinding seat 3 has a reciprocating screw 12 rotating. The traction block 601 is connected to the reciprocating screw 12 (the figure is only for illustration and does not represent the actual structure of the thread on the surface of the reciprocating screw 12), and the reciprocating screw 12 is driven in one direction by the second motor 11 set on the machine body 1.

[0027] Please see Figure 5 , 6 And 8, the striking mechanism 8 includes: Crankshaft 801 is connected to reciprocating lead screw 12 inside grinding seat 3; Connecting bracket 802, the connecting bracket 802 is located directly below the grinding base 3; and Hinged plate 803 connects the top of connecting bracket 802 to the eccentric part of crankshaft 801. The reciprocating screw 12 can drive the crankshaft 801 to rotate in one direction, thereby enabling the crankshaft 801 to continuously drive 802 to move vertically back and forth. This allows solid impurities and waste sulfuric acid in the holes on the surface of the screen 701 to pass smoothly through the screen 701 by striking it, thus cleaning the screen 701. For some larger solid impurities, vibration can allow them to pass through the inclined section 6061 into the groove 703 for secondary grinding.

[0028] When the reciprocating screw 12 rotates in one direction, it can drive the crankshaft 801 to rotate synchronously. The crankshaft 801 then drives the connecting frame 802 to move vertically and reciprocally as a whole through the hinge plate 803. When the connecting frame 802 is at its lowest point, the bottom of the connecting frame 802 is in contact with the screen 701. This allows the connecting frame 802 to strike the screen 701 when it moves to its lowest point, causing large solid impurities on the horizontal part 7011 to move in the opposite direction to the grinding part 7013 under the action of vibration.

[0029] Please see Figure 6 and 8 For the arc-shaped scraper 603, when it moves towards the center of the machine body 1 to its maximum stroke, the sides of the two arc-shaped scrapers 603 come into contact with each other. However, because there is a gap between the two arc-shaped scrapers 603, an annular area of ​​equal width to the gap will exist on the surface of the first roller 4 that cannot be cleaned. Therefore, a gap cleaning structure 9 is provided on the connecting frame 802. The gap cleaning structure 9 includes: Drive block 901, drive block 901 is movably disposed on the surface of connecting bracket 802; The slit scraper 902 is elastically and movably positioned above the drive block 901; Limiting rod 903, the limiting rod 903 vertically penetrates the two drive blocks 901; Limiting groove 904, the limiting groove 904 is disposed on the surface of the connecting bracket 802; and Guide groove 905 is provided on the inner wall of the body 1, and the two ends of the limiting rod 903 extend into the interior of the two guide grooves 905 respectively.

[0030] Driven by the guide groove 905, the limiting rod 903 can move horizontally back and forth inside the limiting groove 904. At this time, the limiting rod 903 can drive the gap scraper 902 to move back and forth at the bottom of the center part of the first roller 4, thereby cleaning the gap area formed by one end of the two arc-shaped scrapers 603, thus preventing dead corner areas from appearing on the surface of the first roller 4 that are difficult to clean.

[0031] When the connecting frame 802 rises, it can drive the slit scraper 902 to rise synchronously through the limiting rod 903 and the driving block 901. Moreover, the limiting rod 903 can move horizontally back and forth along the trajectory of the guide groove 905, thereby driving the slit scraper 902 to move horizontally back and forth synchronously. When the connecting frame 802 is about to rise to the highest point, the slit scraper 902 just contacts the bottom of the first roller 4. At this time, the connecting frame 802 continues to move upward, and the limiting rod 903 can drive the driving block 901 to move upward at the bottom of the slit scraper 902. Since the slit scraper 902 has already contacted the first roller 4 and is still moving horizontally back and forth, the slit scraper 902 can clean the area on the surface of the first roller 4 that is the same width as the slit.

[0032] The scraping mechanism 6 scrapes off large volumes of raw material adhering to the surface of the first roller 4 and sends them to the secondary grinding mechanism 7. The tapping mechanism 8 vibrates and sends large volumes of solid impurities from the surface of the screen 701 to the secondary grinding mechanism 7. The secondary grinding mechanism 7 grinds these large volumes of solid impurities again, thus preventing them from accumulating inside the machine body 1. At the same time, the gap cleaning structure 9 cleans the surface of the first roller 4 more thoroughly, further preventing the accumulation of large volumes of solid impurities inside the machine body 1, and also enabling the solid impurities and waste sulfuric acid to burn more completely.

[0033] Please see Figure 1In this embodiment, a waste heat recovery mechanism 10 is provided inside the body 1. The waste heat recovery mechanism 10 includes a heat exchange box 1001, a recovery pipe 1002, a connecting pipe 1003, an air inlet pipe 1004, and a circulation pipe 1005. The heat exchange box 1001 is located on one side of the body 1 and is connected to the body 1 via the recovery pipe 1002. The surface of the heat exchange box 1001 is provided with the connecting pipe 1003, the air inlet pipe 1004, and the circulation pipe 1005. 005, one end of the circulation pipe 1005 is connected to the inside of the machine body 1, while the other end of the circulation pipe 1005 is connected to the air inlet pipe 1004 through a pipe inside the heat exchange box 1001. The waste heat recovery mechanism 10 can collect the heat generated when waste sulfuric acid and solid impurities are burned, and use this heat to preheat the room temperature air. The preheated air is then sent into the machine body 1 to participate in the combustion of waste sulfuric acid and solid impurities, thereby reducing the pyrolysis cost of waste sulfuric acid.

[0034] It should be noted that when the sides of the two arc-shaped scrapers 603 come into contact with each other (i.e., the traction block 601 moves towards the center of the machine body 1 to the maximum stroke), the connecting frame 802 needs to drive the gap scraper 902 downward to ensure that the arc-shaped scraper 603 does not collide with the gap scraper 902. The burner 2, the first motor 5 and the second motor 11 are existing devices or equipment in the prior art, or are devices or equipment that can be implemented in the prior art. The principles of the burner 2, the first motor 5 and the second motor 11 are clear to those skilled in the art, so they will not be described in detail.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A combustion device for waste sulfuric acid pyrolysis with waste heat recovery function, comprising a body (1), characterized in that: A burner (2) is installed on one side of the bottom of the machine body (1). A grinding seat (3) and two first rollers (4) are provided inside the machine body (1). The grinding seat (3) is located between the two first rollers (4). A first motor (5) is provided above the machine body (1). The first motor (5) drives the two first rollers (4) to rotate, so that the waste sulfuric acid is crushed in the gap between the first rollers (4) and the grinding seat (3). The machine body (1) is provided with a scraping mechanism (6) for cleaning the first roller (4). The scraping mechanism (6) includes a traction block (601), a bracket (602), an arc-shaped scraper (603), a guide rod (604), and a hopper (605). The traction block (601) is reciprocally disposed inside the grinding seat (3). The bracket (602) is elastically connected to the bottom of the traction block (601). The arc-shaped scraper (603) is disposed on the top of the bracket (602). The guide rod (604) is elastically connected to the side wall of the bracket (602). The hopper (605) is inclinedly disposed below the bracket (602). The arc-shaped scraper (603) reciprocates at the bottom of the first roller (4) through the guide groove (606). The horizontally reset arc-shaped scraper (603) can scrape off the solid impurities and waste sulfuric acid adhering to the surface (4) of the first roller and make them fall into the hopper (605), and perform secondary grinding as the hopper (605) moves. The machine body (1) is also provided with a secondary grinding mechanism (7). The secondary grinding mechanism (7) includes a screen (701), a second roller (702), a groove (703), a worm wheel (704), and a worm (705). The screen (701) is fixed inside the machine body (1). The screen (701) is divided into a horizontal part (7011), an inclined part (7012), and a grinding part (7013). The groove (703) is provided on the surface of the grinding section (7013). The two second rollers (702) rotate on the inner wall of the groove (703) through gear transmission. The worm wheel (704) is fixed on the surface of one of the second rollers (702). The worm (705) rotates on the inner wall of the machine body (1) and is connected to the worm wheel (704). The input end of the worm (705) is connected to one of the first rollers (4) through belt transmission. The machine body (1) is also equipped with a knocking mechanism (8) for cleaning the screen (701). The knocking mechanism (8) includes a crankshaft (801), a connecting frame (802) and a hinge plate (803). The crankshaft (801) is connected to the reciprocating screw (12) inside the grinding seat (3). The connecting frame (802) is located directly below the grinding seat (3). The hinge plate (803) connects the top of the connecting frame (802) to the eccentric part of the crankshaft (801). A second motor (11) is fixed on the side wall of the machine body (1). The output end of the second motor (11) is connected to the reciprocating screw (12). When the reciprocating screw (12) rotates in one direction, it can drive the crankshaft (801) to rotate synchronously. The crankshaft (801) then drives the connecting frame (802) to move vertically and reciprocally as a whole through the hinge plate (803), so that the connecting frame (802) can strike the screen (701) when it moves to the lowest end. The guide groove (606) is disposed on the inner wall of the grinding seat (3) and is connected to the guide rod (604). The guide groove (606) is divided into an inclined section (6061), a horizontal section (6062) and a reset section (6063). The inclined section (6061), the horizontal section (6062) and the reset section (6063) are connected end to end to form a triangle. The end of the reset section (6063) and the beginning of the tilt section (6061) are connected by an arc surface. The depth of the tilt section (6061) gradually becomes shallower along the direction close to the center of the body (1). The depth of the horizontal section (6062) is greater than the shallowest point of the tilt section (6061). A crevice cleaning structure (9) is provided on the connecting frame (802). The crevice cleaning structure (9) includes a driving block (901), a crevice scraper (902), a limiting rod (903), a limiting groove (904), and a guide groove (905). The driving block (901) is movably disposed on the surface of the connecting frame (802). The crevice scraper (902) is elastically disposed above the driving block (901). The limiting rod (903) vertically penetrates the two driving blocks (901). The limiting groove (904) is disposed on the surface of the connecting frame (802). The guide groove (905) is disposed on the inner wall of the body (1). The two ends of the limiting rod (903) extend into the interior of the two guide grooves (905).

2. The combustion equipment for waste sulfuric acid pyrolysis with waste heat recovery function according to claim 1, characterized in that: The first motor (5) is connected to one of the first rollers (4) by belt drive, and the two first rollers (4) are connected by gear drive.

3. The combustion equipment for waste sulfuric acid pyrolysis with waste heat recovery function according to claim 1, characterized in that: The body (1) is equipped with a waste heat recovery mechanism (10), which includes a heat exchange box (1001), a recovery pipe (1002), a connecting pipe (1003), an air inlet pipe (1004), and a circulation pipe (1005). The heat exchange box (1001) is located on one side of the body (1) and is connected to the body (1) through the recovery pipe (1002).

4. The combustion equipment for waste sulfuric acid pyrolysis with waste heat recovery function according to claim 3, characterized in that: The surface of the heat exchange box (1001) is provided with a connecting pipe (1003), and the surface of the heat exchange box (1001) is also provided with an air inlet pipe (1004) and a circulation pipe (1005). One end of the circulation pipe (1005) is connected to the inside of the body (1), and the other end of the circulation pipe (1005) is connected to the air inlet pipe (1004) inside the heat exchange box (1001) through a pipe.

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