A device for recovering and utilizing the waste heat of metal casting pouring and its utilization method

Abstract

The present invention provides a device for recovering and utilizing waste heat from metal casting casting and a method for utilizing the same, comprising a recovery input mechanism, which comprises a recovery hood and a conveying pipe, wherein the conveying pipe is provided with a high-temperature output pipe and a low-temperature output pipe; a recovery pipe connected to the high-temperature output pipe; a frame; a high-temperature section recovery mechanism installed on the frame, which comprises a waste heat recovery box connected to the recovery pipe, a buffer box arranged on the top of the waste heat recovery box and a heat exchange box arranged on the top of the buffer box, wherein an evaporative heat absorption component is provided in the waste heat recovery box; the present invention can absorb the heat of high-temperature flue gas by arranging a high-temperature section recovery mechanism, a medium- and low-temperature section recovery mechanism and a spray treatment tower, thereby realizing efficient recovery and utilization of waste heat from flue gas, the flue gas after spray treatment is sucked out, and at the same time, residues attached to the bottom of the filter plate are continuously cleaned to ensure the efficiency of flue gas circulation, and power-free temperature control diversion is realized by setting the recovery input mechanism, which is beneficial to the effective recovery of waste heat from high and low temperature flue gases.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting, and in particular to a device for recovering and utilizing waste heat from pouring of metal castings and a method for recovering and utilizing waste heat from pouring of metal castings. Background Art

[0002] Metal casting involves pouring molten metal into a hollow mold made of high-temperature resistant material. After condensation, the desired shape is formed, resulting in a product known as a casting. The metal casting process, including smelting and pouring, generates large amounts of high-temperature flue gas. Effectively recycling the heat energy contained in this flue gas can improve energy efficiency, reduce production costs, and minimize environmental pollution. This flue gas heats the air entering the combustion furnace, raising its temperature and enhancing combustion efficiency, thereby reducing fuel consumption and effectively recycling it.

[0003] Existing waste heat recovery devices utilize direct heat exchange between high-temperature flue gas and air. For example, finned tubes or plate heat exchangers are installed in the flue gas recovery flow path, utilizing convection between the flue gas and air to transfer heat. However, due to insufficient temperature gradients, heat energy is not effectively utilized, resulting in low recovery efficiency. Furthermore, due to the densely packed heat exchanger piping, pollutants carried in the flue gas are deposited on the heat exchanger surface, affecting waste heat recovery. Subsequent flue gas transport also makes it difficult to clean the flue gas, hindering heat recovery during continuous flue gas discharge. Therefore, the present invention proposes a waste heat recovery device for metal castings and a method for its use to address the aforementioned issues. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a metal casting waste heat recovery and utilization device to solve the problems raised in the above background technology that the flue gas heat energy is not effectively utilized, the recovery efficiency is low, and it is not convenient to clean the subsequent flue gas during transportation, which is not conducive to the recovery of heat energy during the continuous discharge of flue gas.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: a metal casting casting waste heat recovery and utilization device, including a recovery input mechanism, which includes a recovery cover and a delivery pipe, the delivery pipe is provided with a high-temperature output pipe and a low-temperature output pipe; a recovery pipe connected to the high-temperature output pipe; a frame;

[0006] The high-temperature section recovery mechanism installed on the frame includes a waste heat recovery box connected to the recovery pipe, a buffer box arranged on the top of the waste heat recovery box, and a heat exchange box arranged on the top of the buffer box. The waste heat recovery box is provided with an evaporative heat absorbing element, and the heat exchange box is provided with a storage tank B for the steam to flow into after the evaporative heat absorbing element absorbs heat;

[0007] The medium and low temperature section recovery mechanism is provided on one side of the rack, and includes an air supply pipe section A and an air supply pipe section B connected to the heat exchange box. The air inlet end of the air supply pipe section A is connected to the circulation box, and the flue gas output end of the waste heat recovery box is connected to the input pipe. A primary heat absorbing component installed on the input pipe is provided between the air supply pipe section A and the air supply pipe section B; and

[0008] The spray treatment tower includes a tower body connected to an input pipe and a spray part arranged in the tower body. The outlet end of the low-temperature output pipe is connected to the tower body through a connecting pipe. The inner wall of the tower body is connected to a fixing ring. The bottom of the fixing ring is connected to a filter plate through a spring telescopic rod. A cleaning part is installed at the bottom of the filter plate. A knocking sleeve is provided on the top of the filter plate. A lifting part is installed in the tower body to drive the knocking sleeve to move back and forth.

[0009] Further improvements are as follows: the evaporative heat absorption component includes several storage tanks A arranged in the waste heat recovery box, a steam output pipe A extending into the buffer box, and a return pipe A connected to one side of the bottom of the buffer box. The tops of several storage tanks A are connected to the same steam output pipe A through pipelines, and the bottoms of several storage tanks A are connected to the same return pipe A through pipelines. The top of the buffer box is equipped with a steam output pipe B extending into the heat exchange box, and the tops of the storage tanks B are connected to the same steam output pipe B through pipelines. The top side of the buffer box is connected to a return pipe B extending into the heat exchange box, and the bottoms of the storage tanks B are connected to the same return pipe B through pipelines.

[0010] A further improvement is that: the recovery input mechanism also includes a temperature control tube installed on the recovery cover, and a protective cover is installed on the top of the recovery cover; a first plunger and a second plunger are slidably provided in the delivery tube, and the first plunger and the second plunger are connected by a connecting column. The distance between the high-temperature output tube and the low-temperature output tube is greater than the length of the connecting column. A spring is installed in the delivery tube on the side of the second plunger away from the connecting column. A temperature control toggle is provided on the top of the recovery cover for driving the first plunger to move horizontally.

[0011] The top end of the gear train is connected with the gear shift pinion, and the top of the gear train is connected with the gear shift pinion, and the top of the gear train is connected with the gear shift pinion.

[0012] A further improvement is that the primary heat absorbing element includes an insulation sleeve installed on the input pipe and a serpentine coil provided between the insulation sleeve and the input pipe, one end of the serpentine coil is connected to section A of the air supply pipe, and the other end is connected to section B of the air supply pipe;

[0013] The circulation box is arranged at the bottom of the tower body and is connected to section A of the air supply pipe. A transmission shaft is rotatably arranged in the circulation box. The outer wall of the transmission shaft is connected to a plurality of arc-shaped moving blades, and the plurality of arc-shaped moving blades are arranged in a circular array. One side of the circulation box is connected to the oblique air inlet pipe, and the air outlet end of the oblique air inlet pipe corresponds to the concave part of the arc-shaped moving blade.

[0014] A further improvement is that the cleaning part includes a rotating column rotatably installed at the center of the filter disc, a lever connected to one side of the rotating column, and a cleaning brush connected to the side of the lever close to the filter disc. A square hole is provided in the rotating column, and a square rod is slidably inserted into the square hole. The bottom of the square rod is connected to a transmission rod, and the transmission rod is rotatably connected to the tower body, and the bottom of the transmission rod extends into the circulation box and is connected to the transmission shaft.

[0015] A further improvement is that: the top of the tower body is connected to a mounting tube, the mounting tube is rotatably connected to a central shaft through a bracket, and the top end of the central shaft is connected to an axial flow fan blade;

[0016] The inner wall of the tower body is connected to the sealing cylinder through a support rod. The central axis is rotatably connected to the sealing cylinder and extends into the sealing cylinder to be connected to the active bevel gear. The sealing cylinder is rotatably connected to a driven bevel gear that meshes with the active bevel gear. The eccentric part of one side of the driven bevel gear is rotatably connected to the eccentric rod. The bottom end of the eccentric rod is rotatably connected to the lifting slide rod. The bottom of the lifting slide rod passes through the sealing cylinder to be connected to the knocking sleeve.

[0017] Further improvements are: a pipe seat for stably fixing the delivery pipe is provided on the top of the recovery cover, and a guide seat for stably supporting the sliding of the horizontal rod is also provided on the top of the recovery cover; the high-temperature output pipe is connected to the recovery pipe through a high-temperature pipe; the connecting pipe fitting includes a low-temperature pipe connected to the low-temperature output pipe, and the end of the low-temperature pipe away from the low-temperature output pipe is connected to the end of the input pipe close to the tower body, and valves are connected to both the high-temperature pipe and the low-temperature pipe.

[0018] A further improvement is that: the end of the installation pipe away from the tower body is connected to the output pipe, the end of the output pipe away from the installation pipe is connected to the fan, and the air outlet end of the fan is connected to the air supply pipe.

[0019] A further improvement is that the spraying member includes a spraying pipe group installed in the tower body, a liquid inlet pipe connected to the storage tank A is installed on one side of the tower body, and a liquid outlet pipe is connected to the bottom side of the tower body.

[0020] The above-mentioned metal casting casting waste heat recovery and utilization device is used, and the utilization method includes the following steps:

[0021] S1. Align the recovery hood accurately with the waste heat recovery point after the metal casting is poured. Recovery hoods can be set at different processing points during use to ensure that high-temperature flue gas is introduced into the recovery hood. The combustion-supporting air that has been purified externally can be introduced from the circulation box. When the device is working, high-temperature flue gas flows from the high-temperature output pipe on the conveying pipe into the recovery pipe, and then enters the waste heat recovery box to recover sensible heat. Low-temperature flue gas flows into the tower body from the low-temperature output pipe.

[0022] S2. In the waste heat recovery box, the evaporative heat absorber absorbs the heat of the high-temperature flue gas and converts it into steam. The steam then flows into the heat exchange box to prepare for heat exchange with the subsequent air. The flue gas flows through the waste heat recovery box to the input pipe. The combustion air passes through the primary heat absorber for preliminary heating, recovering the waste heat of the flue gas in the input pipe. The air then flows into the heat exchange box, where the steam heats the air for a second time. The heated air is then transported to the combustion equipment through a dedicated pipeline.

[0023] S3, the flue gas enters the tower body, is sprayed by the spray parts, and is filtered by the filter disc to absorb pollutants in the flue gas, and the flue gas is discharged from the tower body;

[0024] S4. The lifting part drives the knocking sleeve to move up and down periodically to knock the filter plate. The spring telescopic rod drives the filter plate to rebound, and the filter plate vibrates, causing the particles to be shaken off. The cleaning part cooperates with the cleaning part to clean the residue attached to the bottom of the filter plate.

[0025] The present invention is provided with a high-temperature section recovery mechanism, a medium- and low-temperature section recovery mechanism and a spray treatment tower, which can absorb the heat of the high-temperature flue gas and convert it into steam to exchange heat with the subsequent air. Compared with the direct heat exchange between the high-temperature flue gas and the air, the present invention improves the thermal efficiency and energy utilization rate, completes the one-way heat conduction process of transferring heat from the high end to the low end, so as to carry out efficient heat transfer and realize the efficient recovery and utilization of the waste heat of the flue gas; the flue gas after the spray treatment is sucked out, and the lifting member periodically drives the knocking sleeve to move up and down to knock the filter plate, and the spring telescopic rod drives the filter plate to rebound, and the filter plate vibrates, prompting the particulate matter to be shaken off, and cooperates with the cleaning member to clean the residue attached to the bottom of the filter plate to prevent the particulate matter from clogging the filter holes, thereby ensuring the flue gas circulation efficiency and facilitating the heat energy recovery during the continuous discharge of the flue gas;

[0026] The present invention is provided with a recovery input mechanism. When the temperature rises, the right-handed spiral bimetallic strip is heated and expanded, driving the rack to rise, driving the toggle gear to rotate counterclockwise, the linkage gear to rotate clockwise, the drive disk to rotate eccentrically, the connecting rod pushes the horizontal rod to move right, the first plunger and the second plunger move right to compress the spring, open the high-temperature output pipe, and close the low-temperature output pipe; when the temperature drops, the right-handed spiral bimetallic strip contracts, and the spring rebounds at the same time, the first plunger and the second plunger move left to reset, close the high-temperature output pipe, and open the low-temperature output pipe; thus, power-free temperature control diversion is realized, which is beneficial to the effective recovery of high and low temperature flue gas waste heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a structural diagram of the high temperature section recovery mechanism and part of the low temperature section recovery mechanism of the present invention;

[0029] Figure 3 It is a structural diagram of the high temperature section recovery mechanism of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the spray treatment tower in the present invention;

[0031] Figure 5 It is a schematic structural diagram of the cleaning member of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure inside the circulation box of the present invention;

[0033] Figure 7 It is a structural schematic diagram of the lifting member in the present invention;

[0034] Figure 8 It is a structural diagram of the recycling input mechanism of the present invention;

[0035] Figure 9 It is a partial structural diagram of the recycling input mechanism in the present invention;

[0036] Figure 10 It is a schematic diagram of the internal structure of the temperature control tube in the present invention.

[0037] Among them: 1. Recovery input mechanism; 101. Recovery cover; 102. Delivery pipe; 103. Inlet pipe; 104. Temperature control pipe; 105. Pipe seat; 106. Drive plate; 107. Connecting rod; 108. Horizontal rod; 109. Guide seat; 110. First plunger; 111. Connecting column; 112. Second plunger; 113. Spring; 114. High-temperature output pipe; 115. Low-temperature output pipe; 116. High-temperature pipeline; 117. Low-temperature pipeline; 1 18. Rack; 119. Toggle gear; 120. Linkage gear; 121. Right-handed helical bimetallic strip; 122. Universal coupling; 123. Guide cylinder; 2. Recovery pipe; 3. Rack; 4. High-temperature section recovery mechanism; 401. Waste heat recovery tank; 402. Buffer tank; 403. Heat exchanger; 404. Storage tank A; 405. Steam output pipe A; 406. Return pipe A; 407. Steam output pipe B; 408. Storage tank B; 409. Return Flow pipe B; 5. Medium and low temperature section recovery mechanism; 501. Insulation sleeve; 502. Serpentine coil; 503. Air supply pipe section A; 504. Air supply pipe section B; 505. Circulation box; 506. Oblique air inlet pipe; 507. Drive shaft; 508. Arc-shaped toggle blade; 6. Inlet pipe; 7. Spray treatment tower; 701. Tower body; 702. Mounting pipe; 703. Sealing cylinder; 704. Spray pipe assembly; 705. Liquid inlet pipe; 706. Fixing ring; 707. Spring telescopic rod; 708, filter plate; 709, liquid outlet pipe; 710, rotating column; 711, shift lever; 712, cleaning brush; 713, square hole; 714, square rod; 715, transmission rod; 716, axial flow fan blade; 717, center shaft; 718, driving bevel gear; 719, driven bevel gear; 720, eccentric rod; 721, lifting slide rod; 722, knocking sleeve; 723, support rod; 8, output pipe; 9, fan; 10, air supply pipe. DETAILED DESCRIPTION

[0038] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0039] according to Figures 1-10 As shown, this embodiment proposes a metal casting casting waste heat recovery and utilization device, including

[0040] The recovery input mechanism 1 includes a recovery cover 101 and a delivery pipe 102, wherein the delivery pipe 102 is provided with a high-temperature output pipe 114 and a low-temperature output pipe 115;

[0041] Recovery pipe 2 connected to high temperature output pipe 114; frame 3;

[0042] The high-temperature section recovery mechanism 4 installed on the frame 3 includes a waste heat recovery box 401 connected to the recovery pipe 2, a buffer box 402 arranged on the top of the waste heat recovery box 401, and a heat exchange box 403 arranged on the top of the buffer box 402. The waste heat recovery box 401 is provided with an evaporative heat absorbing element, and the heat exchange box 403 is provided with a storage tank B408 for the steam to flow into after the evaporative heat absorbing element absorbs heat;

[0043] The medium and low temperature section recovery mechanism 5 is provided on one side of the rack 3, and includes an air supply pipe section A 503 and an air supply pipe section B 504 connected to the heat exchange box 403. The air inlet end of the air supply pipe section A 503 is connected to the circulation box 505, and the flue gas output end of the waste heat recovery box 401 is connected to the input pipe 6. A primary heat absorbing component installed on the input pipe 6 is provided between the air supply pipe section A 503 and the air supply pipe section B 504; and

[0044] The spray treatment tower 7 includes a tower body 701 connected to the input pipe 6 and a spray element disposed within the tower body 701. The outlet end of the low-temperature output pipe 115 is connected to the tower body 701 via a connecting pipe. The inner wall of the tower body 701 is connected to a fixing ring 706. The bottom of the fixing ring 706 is connected to a filter plate 708 via a spring telescopic rod 707. A cleaning element is installed at the bottom of the filter plate 708. A knocking sleeve 722 is provided on the top of the filter plate 708. A lifting element is installed within the tower body 701 to drive the knocking sleeve 722 to move back and forth.

[0045] By adopting the above scheme, the recovery cover 101 is accurately aligned with the waste heat recovery point after the metal casting is poured. The recovery cover 101 can be set at different processing points during use to ensure that the high-temperature flue gas is introduced into the recovery cover 101. The combustion-supporting air that has been purified externally can be introduced from the circulation box 505. When the device is working, the high-temperature flue gas flows into the recovery pipe 2 from the high-temperature output pipe 114 on the conveying pipe 102, and then enters the waste heat recovery box 401 to recover sensible heat. The low-temperature flue gas flows into the tower body 701 from the low-temperature output pipe 115; in the waste heat recovery box 401, the evaporating heat absorbing component absorbs the heat of the high-temperature flue gas and converts it into steam. The steam then flows into the heat exchange box 403, ready to exchange heat with the subsequent air. The flue gas passes through the waste heat recovery box 4 01 flows into the input pipe 6, and the combustion air is preliminarily heated by the primary heat absorbing component to recover the waste heat of the flue gas in the input pipe 6. Then the air flows into the heat exchange box 403, and the steam heats the air for a second time. The heated air is transported to the combustion equipment through a dedicated pipeline; the flue gas enters the tower body 701, is sprayed by the spray component, and at the same time, is filtered by the filter disc 708 to adsorb pollutants in the flue gas, and the flue gas is discharged from the tower body 701; the lifting component periodically drives the knocking sleeve 722 to move up and down, knocking the filter disc 708, and the spring telescopic rod 707 drives the filter disc 708 to rebound, and the filter disc 708 vibrates, prompting the particulate matter to be shaken off, and cooperates with the cleaning component to clean the residue attached to the bottom of the filter disc 708.

[0046] like Figures 8-10 As shown, the recovery input mechanism 1 also includes a temperature control tube 104 installed on the recovery cover 101, and a protective cover is installed on the top of the recovery cover 101; a first plunger 110 and a second plunger 112 are slidably provided in the delivery pipe 102, and the first plunger 110 and the second plunger 112 are connected by a connecting column 111. The distance between the high-temperature output pipe 114 and the low-temperature output pipe 115 is greater than the length of the connecting column 111. A spring 113 installed in the delivery pipe 102 is provided on the side of the second plunger 112 away from the connecting column 111. A temperature control toggle member for driving the first plunger 110 to move horizontally is provided on the top of the recovery cover 101;

[0047] Among them, the temperature control toggle member includes a right-handed spiral bimetallic strip 121 installed in the temperature control tube 104, the bottom end of the right-handed spiral bimetallic strip 121 is connected to the bottom of the temperature control tube 104, the top of the right-handed spiral bimetallic strip 121 is connected to the universal coupling 122, the top of the universal coupling 122 is connected to the rack 118, and the top of the temperature control tube 104 is installed with a guide cylinder 123 for stably guiding the rack 118 to rise and fall. A toggle gear 119 meshing with the rack 118 is rotatably connected in the protective cover, and a linkage gear 120 meshing with the toggle gear 119 is also rotatably connected in the protective cover, and one side shaft end of the linkage gear 120 is connected to the drive The driving disc 106 is rotatably connected to the connecting rod 107 at an eccentric position on the side away from the linkage gear 120. The connecting rod 107 is rotatably connected to the horizontal rod 108 at one end away from the driving disc 106. The horizontal rod 108 extends into the delivery pipe 102 and is rotatably connected to the side of the first plunger 110 away from the connecting column 111. The bottom of the delivery pipe 102 is connected to the air intake pipe 103 extending into the recovery cover 101, and the air intake pipe 103 is placed at the bottom between the high-temperature output pipe 114 and the low-temperature output pipe 115. The outer layer of the right-handed spiral bimetallic strip 121 is a high-expansion layer, and the inner side of the right-handed spiral bimetallic strip 121 is a low-expansion layer.

[0048] The top of the recovery cover 101 is provided with a pipe seat 105 for stably fixing the delivery pipe 102, and the top of the recovery cover 101 is also provided with a guide seat 109 for stably supporting the sliding of the horizontal rod 108; the high-temperature output pipe 114 is connected to the recovery pipe 2 through a high-temperature pipe 116; the connecting pipe includes a low-temperature pipe 117 connected to the low-temperature output pipe 115, and the end of the low-temperature pipe 117 away from the low-temperature output pipe 115 is connected to the end of the input pipe 6 close to the tower body 701. Valves are connected to the high-temperature pipe 116 and the low-temperature pipe 117; the valves can be selectively controlled to be closed or opened according to the gas flow conditions in the pipe;

[0049] Specifically, when the temperature rises: the right-handed helical bimetallic strip 121 (with the high expansion layer on the outside) expands due to the heat, driving the rack 118 to rise, driving the toggle gear 119 to rotate counterclockwise, and the linkage gear 120 to rotate clockwise, driving the drive plate 106 to rotate eccentrically, and the connecting rod 107 pushes the horizontal rod 108 to move right. The first plunger 110 and the second plunger 112 move rightward to compress the spring 113, opening the high-temperature output pipe 114 and closing the low-temperature output pipe 115;

[0050] When cooling, the right-handed spiral bimetallic strip 121 contracts, and the spring 113 rebounds, causing the first plunger 110 and the second plunger 112 to move leftward and reset, closing the high-temperature output pipe 114 and opening the low-temperature output pipe 115, thus realizing power-free temperature control and diversion.

[0051] See also Figure 2 and Figure 3The evaporative heat absorption component includes several storage tanks A404 arranged in the waste heat recovery box 401, a steam output pipe A405 extending into the buffer box 402, and a return pipe A406 connected to one side of the bottom of the buffer box 402. The tops of several storage tanks A404 are connected to the same steam output pipe A405 through pipelines, and the bottoms of several storage tanks A404 are connected to the same return pipe A406 through pipelines. The top of the buffer box 402 is equipped with a steam output pipe B407 extending into the heat exchange box 403, and the top of the storage tank B408 is connected to the same steam output pipe B407 through a pipeline. The top side of the buffer box 402 is connected to a return pipe B409 extending into the heat exchange box 403, and the bottom of the storage tank B408 is connected to the same return pipe B409 through a pipeline;

[0052] Specifically, softened water and other thermal working media can be pre-placed in the storage tank A404. The high-temperature flue gas passes through the waste heat recovery box 401, and the thermal working media (such as softened water) in the storage tank A404 is converted from liquid to gas. The steam enters the buffer tank 402 along the steam output pipe A405. The thermal working media in the buffer tank 402 is also heated, and part of the steam condenses into liquid. The steam in the buffer tank 402 rises to the storage tank B408 in the heat exchange box 403. When the air flows in the heat exchange box 403, the storage tank B408 releases heat to the outside, and the steam in it condenses into liquid, and then flows to the buffer tank 402 through the return pipe B409. The liquid in the buffer tank 402 is in common with the liquid in the storage tank A404, forming a cycle, completing the one-way heat conduction process of transferring heat from the high end to the low end, so as to perform efficient heat transfer and realize the efficient recovery and utilization of the waste heat of the flue gas.

[0053] See also Figure 2 The primary heat absorbing element includes a heat-insulating sleeve 501 mounted on the input pipe 6 and a serpentine coil 502 disposed between the heat-insulating sleeve 501 and the input pipe 6. One end of the serpentine coil 502 is connected to the air supply pipe section A 503, and the other end is connected to the air supply pipe section B 504.

[0054] Specifically, the serpentine coil 502 continues to recover the residual heat of the flue gas in the input pipe 6, thereby improving energy utilization efficiency.

[0055] See also Figure 4 and Figure 6 The circulation box 505 is arranged at the bottom of the tower body 701 and is connected to the air supply pipe section A 503. A transmission shaft 507 is rotatably arranged in the circulation box 505. The outer wall of the transmission shaft 507 is connected to a plurality of arc-shaped toggling blades 508, and the plurality of arc-shaped toggling blades 508 are arranged in a circular array. One side of the circulation box 505 is connected to the oblique air inlet pipe 506, and the air outlet end of the oblique air inlet pipe 506 corresponds to the concave part of the arc-shaped toggling blade 508.

[0056] Specifically, the oblique air intake pipe 506 draws air into the circulation box 505, and the arc-shaped moving blades 508 are able to move after being impacted by the oblique flow of air. Several arc-shaped moving blades 508 rotate around the axis of the transmission shaft 507, and the air is then output from the air supply pipe section A 503.

[0057] See also Figure 4 、 Figure 5 and Figure 6 The cleaning member includes a rotating column 710 rotatably mounted at the center of the filter disc 708, a lever 711 connected to one side of the rotating column 710, and a cleaning brush 712 connected to the lever 711 on the side close to the filter disc 708. A square hole 713 is provided in the rotating column 710, and a square rod 714 is slidably passed through the square hole 713. The bottom of the square rod 714 is connected to a transmission rod 715, and the transmission rod 715 is rotatably connected to the tower body 701. The bottom of the transmission rod 715 extends into the circulation box 505 and is connected to the transmission shaft 507.

[0058] Specifically, the transmission shaft 507 rotates, which can drive the transmission rod 715 to rotate, thereby driving the square rod 714 to rotate, and the square rod 714 drives the rotating column 710 to rotate. When the filter plate 708 floats up and down, the square rod 714 slides in the square hole 713 without affecting the rotation drive of the rotating column 710. The lever 711 can rotate around the axis of the rotating column 710, so that the cleaning brush 712 cleans the bottom of the filter plate 708 to ensure the efficiency of smoke circulation.

[0059] See also Figure 4 and Figure 7 The top of the tower body 701 is connected to the mounting tube 702, and the mounting tube 702 is rotatably connected to the central shaft 717 through the bracket, and the top of the central shaft 717 is connected to the axial flow fan blade 716;

[0060] Specifically, when the smoke is drawn out of the tower body 701 , the flowing air drives the axial flow blades 716 to rotate.

[0061] See also Figure 4 and Figure 7 The inner wall of the tower body 701 is connected to the sealing cylinder 703 through a support rod 723. The central shaft 717 is rotatably connected to the sealing cylinder 703 and extends into the sealing cylinder 703 to be connected to the active bevel gear 718. The sealing cylinder 703 is rotatably connected to a driven bevel gear 719 that meshes with the active bevel gear 718. The eccentric part of one side of the driven bevel gear 719 is rotatably connected to the eccentric rod 720. The bottom end of the eccentric rod 720 is rotatably connected to the lifting slide rod 721. The bottom of the lifting slide rod 721 passes through the sealing cylinder 703 and is connected to the knocking sleeve 722.

[0062] During the rotation of the axial flow fan blades 716, the active bevel gear 718 will be driven to rotate, thereby driving the driven bevel gear 719 to rotate. Under the rotation drive of the eccentric rod 720, the lifting slide rod 721 is driven to slide back and forth, and the knocking sleeve 722 moves up and down, knocking the filter plate 708. The spring telescopic rod 707 drives the filter plate 708 to rebound, and the filter plate 708 vibrates, causing the particles to be shaken off to prevent the particles from clogging the filter holes.

[0063] See also Figure 1 The end of the installation pipe 702 away from the tower body 701 is connected to the output pipe 8, the end of the output pipe 8 away from the installation pipe 702 is connected to the fan 9, and the air outlet end of the fan 9 is connected to the air supply pipe 10;

[0064] When the fan 9 is working, negative pressure can be generated in the output pipe 8 and the installation pipe 702 to suck the smoke.

[0065] See also Figure 4 The spraying part includes a spray pipe group 704 installed in the tower body 701, a liquid inlet pipe 705 connected to the storage tank A404 is installed on one side of the tower body 701, and a liquid outlet pipe 709 is connected to the bottom side of the tower body 701;

[0066] Specifically, the spray pipes of the spray pipe group 704 can be set according to actual needs, such as Figure 4 As shown, the spray pipes in the spray pipe group 704 can be configured as a combination of an annular and a circumferentially arrayed straight pipe without affecting the operation of other components. Alkaline solution or other spray liquid can be input through the liquid inlet pipe 705. After the spray liquid contacts the flue gas, it flows to the bottom of the tower body 701 and is discharged from the liquid outlet pipe 709. The spray liquid can be recycled, and the heat entrained by the spray liquid can also be recovered. Low-temperature flue gas (<100°C) enters the tower body 701 through the low-temperature output pipe 115. The spray pipe group 704 sprays an alkaline solution (pH 10-12) to neutralize acidic gases such as SO2 and HCl, while the water mist captures PM2.5 particles. After spraying, the particulate matter removal rate is ≥95%, and the acid gas removal rate is ≥85%.

[0067] The above-mentioned metal casting waste heat recovery device is used, and the utilization method includes the following steps:

[0068] S1. Accurately align the recovery hood 101 with the waste heat recovery point after the metal casting is cast. The recovery hood 101 can be set at different processing points during use to ensure that the high-temperature flue gas is introduced into the recovery hood 101, and the combustion-supporting air that has been purified externally can be introduced from the circulation box 505. When the device is working, the high-temperature flue gas flows into the recovery pipe 2 from the high-temperature output pipe 114 on the conveying pipe 102, and then enters the waste heat recovery box 401 to recover sensible heat, and the low-temperature flue gas flows into the tower body 701 from the low-temperature output pipe 115; accurately align the recovery hood 101 with the waste heat recovery point after the metal casting is cast, to ensure that the high-temperature flue gas is introduced into the recovery hood 101, and the combustion-supporting air that has been purified externally can be introduced from the circulation box 505, and the oblique air inlet pipe 506 is used to intake air into the circulation box 505. The arc-shaped moving blades 508 can move after being impacted by the oblique flow of air. Several arc-shaped moving blades 508 rotate around the axis of the transmission shaft 507, and the air Afterwards, the flue gas is output from the air supply pipe section A 503, the device works, the fan 9 works, and a negative pressure can be generated in the output pipe 8 and the installation pipe 702 to extract the flue gas. The high-temperature flue gas flows from the recovery cover 101 into the recovery pipe 2 and then enters the waste heat recovery box 401. When the temperature rises, the right-handed spiral bimetallic strip 121 (the high expansion layer is on the outside) is heated and expanded, driving the rack 118 to rise, driving the toggle gear 119 to rotate counterclockwise, the linkage gear 120 to rotate clockwise, the drive disk 106 to rotate eccentrically, the connecting rod 107 pushes the horizontal rod 108 to the right, the first plunger 110 and the second plunger 112 move to the right to compress the spring 113, open the high-temperature output pipe 114, and close the low-temperature output pipe 115. When the temperature drops, the right-handed spiral bimetallic strip 121 contracts, and the spring 113 rebounds, the first plunger 110 and the second plunger 112 move to the left to reset, closing the high-temperature output pipe 114 and opening the low-temperature output pipe 115.

[0069] S2. In the waste heat recovery box 401, a thermal medium such as softened water can be pre-placed in the storage tank A404. When the high-temperature flue gas passes through the waste heat recovery box 401, the thermal medium (such as softened water) in the storage tank A404 changes from liquid to gas. The steam enters the buffer box 402 along the steam output pipe A405. The thermal medium in the buffer box 402 is also heated, and part of the steam condenses into liquid. The steam in the buffer box 402 rises to the storage tank B408 in the heat exchange box 403. When the air flows in the heat exchange box 403, the storage tank B408 releases heat to the outside, and the steam in it condenses into liquid. The flue gas then flows through the return pipe B409 to the buffer tank 402. The liquid in the buffer tank 402 communicates with the liquid in the storage tank A404, forming a circulation, completing a one-way heat conduction process that transfers heat from the high end to the low end, thereby achieving efficient heat transfer and realizing efficient recovery and utilization of the flue gas waste heat. The flue gas flows through the waste heat recovery tank 401 to the input pipe 6. The serpentine coil 502 continues to recover the residual heat of the flue gas in the input pipe 6, recovering the waste heat of the flue gas in the input pipe 6. The air then flows into the heat exchange box 403, where the steam reheats the air. The heated air is then transported to the combustion equipment through a dedicated pipeline.

[0070] S3: The flue gas enters the tower body 701, is sprayed by the spray element, and is filtered by the filter disc 708 to absorb pollutants in the flue gas. The flue gas is then discharged from the tower body 701.

[0071] S4. When the flue gas is drawn out of the tower body 701, the flowing air will drive the rotation of the axial flow fan blades 716. During the rotation of the axial flow fan blades 716, the active bevel gear 718 will be driven to rotate, thereby driving the driven bevel gear 719 to rotate. Under the rotation drive of the eccentric rod 720, the lifting slide rod 721 is driven to slide back and forth, periodically driving the knocking sleeve 722 to move up and down, knocking the filter plate 708. The spring telescopic rod 707 drives the filter plate 708 to rebound, and the filter plate 708 vibrates, causing the particulate matter to be shaken off. The rotation of the transmission shaft 507 can drive the transmission rod 715 to rotate, thereby driving the square rod 714 to rotate. The square rod 714 drives the rotating column 710 to rotate. The filter plate 708 floats up and down, and the square rod 714 slides in the square hole 713 without affecting the rotation drive of the rotating column 710. The shifting rod 711 can rotate around the axis of the rotating column 710, so that the cleaning brush 712 cleans the bottom of the filter plate 708 to ensure the efficiency of flue gas circulation.

[0072] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for recovering and utilizing waste heat from metal casting, characterized in that: include: A recovery input mechanism (1) comprising a recovery cover (101) and a delivery pipe (102), wherein the delivery pipe (102) is provided with a high-temperature output pipe (114) and a low-temperature output pipe (115); a recovery pipe (2) connected to the high-temperature output pipe (114); Rack (3); A high-temperature section recovery mechanism (4) mounted on the frame (3) comprises a waste heat recovery box (401) connected to the recovery pipe (2), a buffer box (402) arranged on top of the waste heat recovery box (401), and a heat exchange box (403) arranged on top of the buffer box (402), wherein an evaporative heat absorbing element is provided in the waste heat recovery box (401), and a storage tank B (408) is provided in the heat exchange box (403) for the steam to flow into after the evaporative heat absorbing element absorbs heat; A medium and low temperature section recovery mechanism (5) is provided on one side of the frame (3), comprising an air supply pipe section A (503) and an air supply pipe section B (504) connected to the heat exchange box (403); an air inlet end of the air supply pipe section A (503) is connected to the circulation box (505); a flue gas output end of the waste heat recovery box (401) is connected to the input pipe (6); and a primary heat absorbing element installed on the input pipe (6) is provided between the air supply pipe section A (503) and the air supply pipe section B (504); and A spray treatment tower (7) comprises a tower body (701) connected to an input pipe (6) and a spraying member arranged in the tower body (701); the gas outlet end of the low-temperature output pipe (115) is connected to the tower body (701) via a connecting pipe; the inner wall of the tower body (701) is connected to a fixing ring (706); the bottom of the fixing ring (706) is connected to a filter plate (708) via a spring telescopic rod (707); a cleaning member is installed at the bottom of the filter plate (708); a knocking sleeve (722) is provided at the top of the filter plate (708); and a lifting member is installed in the tower body (701) for driving the knocking sleeve (722) to move back and forth; The evaporative heat absorption component includes a plurality of storage tanks A (404) arranged in a waste heat recovery box (401), a steam output pipe A (405) extending into the buffer box (402), and a return pipe A (406) connected to one side of the bottom of the buffer box (402), the tops of the plurality of storage tanks A (404) are connected to the same steam output pipe A (405) through a pipe, and the bottoms of the plurality of storage tanks A (404) are connected to the same return pipe A (406) through a pipe, the top of the buffer box (402) is provided with a steam output pipe B (407) extending into the heat exchange box (403), the top of the storage tank B (408) is connected to the same steam output pipe B (407) through a pipe, the top side of the buffer box (402) is connected to a return pipe B (409) extending into the heat exchange box (403), and the bottom of the storage tank B (408) is connected to the same return pipe B (409) through a pipe.

2. The metal casting waste heat recovery device according to claim 1, characterized in that: The recycling input mechanism (1) further comprises a temperature control tube (104) mounted on the recycling cover (101), and a protective cover is mounted on the top of the recycling cover (101); a first plunger (110) and a second plunger (112) are slidably mounted in the delivery tube (102); the first plunger (110) and the second plunger (112) are connected via a connecting column (111); the distance between the high-temperature output tube (114) and the low-temperature output tube (115) is greater than the length of the connecting column (111); a spring (113) mounted in the delivery tube (102) is provided on the side of the second plunger (112) away from the connecting column (111); and a temperature control toggle member for driving the first plunger (110) to move horizontally is provided on the top of the recycling cover (101); The temperature control toggle member includes a right-handed spiral bimetallic strip (121) installed in the temperature control tube (104), the bottom end of the right-handed spiral bimetallic strip (121) is connected to the bottom of the temperature control tube (104), the top end of the right-handed spiral bimetallic strip (121) is connected to the universal coupling (122), the top end of the universal coupling (122) is connected to the rack (118), the top of the temperature control tube (104) is installed with a guide cylinder (123) for stably guiding the rack (118) to rise and fall, the protective cover is rotatably connected to a toggle gear (119) meshed with the rack (118), the protective cover is also rotatably connected to a linkage gear (120) meshed with the toggle gear (119), and one side shaft end of the linkage gear (120) is connected to a drive disk. (106), the driving disc (106) is rotatably connected to the connecting rod (107) at an eccentric position away from the linkage gear (120), and the connecting rod (107) is rotatably connected to the horizontal rod (108) at one end away from the driving disc (106), and the horizontal rod (108) extends into the delivery pipe (102) and is rotatably connected to the side of the first plunger (110) away from the connecting column (111); the bottom of the delivery pipe (102) is connected to an air intake pipe (103) extending into the recovery cover (101), and the air intake pipe (103) is placed at the bottom between the high-temperature output pipe (114) and the low-temperature output pipe (115); the outer layer of the right-handed spiral bimetallic strip (121) is a high-expansion layer, and the inner side of the right-handed spiral bimetallic strip (121) is a low-expansion layer.

3. The metal casting waste heat recovery device according to claim 2, characterized in that: The primary heat absorbing element comprises a heat-insulating sleeve (501) mounted on the input pipe (6) and a serpentine coil (502) disposed between the heat-insulating sleeve (501) and the input pipe (6), wherein one end of the serpentine coil (502) is connected to the air supply pipe section A (503) and the other end is connected to the air supply pipe section B (504); The circulation box (505) is arranged at the bottom of the tower body (701), and the circulation box (505) is connected to the air supply pipe section A (503). A transmission shaft (507) is rotatably arranged in the circulation box (505), and the outer wall of the transmission shaft (507) is connected to a plurality of arc-shaped shifting blades (508), and the plurality of arc-shaped shifting blades (508) are arranged in a circular array. One side of the circulation box (505) is connected to the oblique air inlet pipe (506), and the air outlet end of the oblique air inlet pipe (506) corresponds to the inner concave portion of the arc-shaped shifting blade (508).

4. The metal casting waste heat recovery device according to claim 3, characterized in that: The cleaning member comprises a rotating column (710) rotatably mounted at the center of the filter disc (708), a lever (711) connected to one side of the rotating column (710), and a cleaning brush (712) connected to the lever (711) on a side close to the filter disc (708). A square hole (713) is provided in the rotating column (710), a square rod (714) is slidably inserted into the square hole (713), the bottom of the square rod (714) is connected to a transmission rod (715), the transmission rod (715) is rotatably connected to the tower body (701), and the bottom of the transmission rod (715) extends into the circulation box (505) and is connected to the transmission shaft (507).

5. The metal casting waste heat recovery device according to claim 1, characterized in that: The top of the tower body (701) is connected to the mounting tube (702), the mounting tube (702) is rotatably connected to the central shaft (717) via a bracket, and the top of the central shaft (717) is connected to the axial flow fan blade (716); The inner wall of the tower body (701) is connected to the sealing cylinder (703) via a support rod (723); the central shaft (717) is rotatably connected to the sealing cylinder (703) and extends into the sealing cylinder (703) to be connected to the active bevel gear (718); a driven bevel gear (719) meshing with the active bevel gear (718) is rotatably connected to the sealing cylinder (703); an eccentric portion on one side of the driven bevel gear (719) is rotatably connected to an eccentric rod (720); the bottom end of the eccentric rod (720) is rotatably connected to a lifting slide rod (721); the bottom end of the lifting slide rod (721) passes through the sealing cylinder (703) to be connected to a knocking sleeve (722).

6. The metal casting waste heat recovery device according to claim 2, characterized in that: The top of the recovery cover (101) is provided with a pipe seat (105) for stably fixing the delivery pipe (102), and the top of the recovery cover (101) is also provided with a guide seat (109) for stably supporting the sliding of the horizontal rod (108); the high-temperature output pipe (114) is connected to the recovery pipe (2) through a high-temperature pipe (116); the connecting pipe includes a low-temperature pipe (117) connected to the low-temperature output pipe (115), and the end of the low-temperature pipe (117) away from the low-temperature output pipe (115) is connected to the end of the input pipe (6) close to the tower body (701), and valves are connected to both the high-temperature pipe (116) and the low-temperature pipe (117).

7. The metal casting waste heat recovery device according to claim 5, characterized in that: One end of the installation tube (702) away from the tower body (701) is connected to the output tube (8), one end of the output tube (8) away from the installation tube (702) is connected to the fan (9), and the air outlet end of the fan (9) is connected to the air supply tube (10).

8. The metal casting waste heat recovery and utilization device according to claim 1, characterized in that: The spraying element comprises a spraying pipe group (704) installed in the tower body (701), a liquid inlet pipe (705) connected to the storage tank A (404) is installed on one side of the tower body (701), and a liquid outlet pipe (709) is connected to the bottom side of the tower body (701).

9. A method for utilizing the metal casting waste heat recovery device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Accurately align the recovery hood (101) with the waste heat recovery point after the metal casting is poured. During use, the recovery hood (101) is set at different processing points to ensure that the high-temperature flue gas is introduced into the recovery hood (101). The combustion-supporting air that has been purified externally is introduced from the circulation box (505). When the device is working, the high-temperature flue gas flows from the high-temperature output pipe (114) on the conveying pipe (102) into the recovery pipe (2), and then enters the waste heat recovery box (401) to recover sensible heat. The low-temperature flue gas flows from the low-temperature output pipe (115) into the tower body (701); S2. In the waste heat recovery box (401), the evaporative heat absorbing element absorbs the heat of the high-temperature flue gas and converts it into steam. The steam then flows into the heat exchange box (403) to prepare for heat exchange with the subsequent air. The flue gas flows through the waste heat recovery box (401) to the input pipe (6). The combustion-supporting air passes through the primary heat absorbing element for preliminary heating to recover the waste heat of the flue gas in the input pipe (6). The air then flows into the heat exchange box (403), where the steam heats the air for a second time. The heated air is then transported to the combustion equipment through a dedicated pipeline. S3, the flue gas enters the tower body (701), is sprayed by the spraying element, and is filtered by the filter disc (708), which absorbs pollutants in the flue gas, and the flue gas is discharged from the tower body (701); S4, the lifting member periodically drives the knocking sleeve (722) to move up and down, knocking the filter plate (708), and the spring telescopic rod (707) drives the filter plate (708) to rebound, and the filter plate (708) vibrates, causing the particles to be shaken off, and cooperates with the cleaning member to clean the residue attached to the bottom of the filter plate (708).

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