Kiln tail waste heat recycling device

Abstract

The invention relates to the technical field of waste heat recycling, and discloses a kiln tail waste heat recycling device which comprises a waste heat recycling mechanism evenly installed between a cooling area and a heating area which are arranged in parallel, and the waste heat recycling mechanism comprises a first-order waste heat recycling piece and a second-order waste heat recycling piece. The first-order waste heat recycling part comprises a heat absorption pump, a heat absorption cover, a U-shaped heat transfer pipe and an air leakage pipe, the second-order waste heat recycling part comprises a heat exchange water tank, the air leakage pipe is coiled in the heat exchange water tank, and the two ends of the air leakage pipe extend to the top of the heat exchange tank. According to the invention, heat in the cooling area can preheat the upper side and the lower side of the foamed ceramic, that is, the heat in the cooling area can be introduced into the heating area in time, and waste heat in the cooling area is subjected to first-order reutilization; and heat released through the gas release pipe can be subjected to heat exchange with water in the heat exchange water tank and then discharged, so that waste heat in the temperature rising area can be subjected to second-order recycling.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat reuse, and specifically to a waste heat reuse device for the kiln tail. Background Art

[0002] The firing process of the foam ceramics is mainly divided into three stages: heating up, high-temperature firing, and cooling down. The foam ceramics are placed on a number of high-temperature resistant ceramic rollers driven by a motor and pass through the above stages in sequence. In the heating-up stage, the internal temperature of the heating-up area rises from room temperature to about 900 degrees Celsius. When it reaches the high-temperature firing stage, the internal temperature of the firing area reaches 1100 degrees Celsius for firing and shaping. After the firing is completed, it enters the cooling-down stage, and the internal temperature of the cooling-down area drops from 1100 degrees Celsius to close to room temperature or higher than room temperature for the collection of the foam ceramics.

[0003] After retrieval, a Chinese invention patent with the publication number CN115406239A discloses a foam ceramic firing device and process capable of filtering flue gas, including a workbench. The top of the workbench is fixedly connected with a firing furnace, a filtering box body, and a cooling box. The top of the workbench is fixedly connected with a slide rail passing through the firing furnace and the cooling box. The top of the slide rail is provided with a slide plate located in the firing furnace, and the bottom of the slide plate is slidably connected with the slide rail through a slider. Compared with the prior art, the Chinese invention patent with the publication number CN115406239A can convey the flue gas generated by firing ceramics upward, facilitating the subsequent filtration of the flue gas into the filtering box body.

[0004] However, during the process of firing the foam ceramics in the above-mentioned foam ceramic firing device capable of filtering flue gas, the heat in the cooling box (cooling-down area) for cooling is discharged by means of water cooling, and the waste heat inside the cooling box (cooling-down area) cannot be reused, resulting in waste of energy. Therefore, we propose a waste heat reuse device for the kiln tail that can timely introduce the heat inside the cooling-down area into the heating-up area to save energy. Summary of the Invention

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a waste heat reuse device for the kiln tail, which solves the problem that the waste heat inside the cooling-down area cannot be reused in the prior art, resulting in waste of energy.

[0007] (2) Technical Solutions

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: A waste heat reuse device for the kiln tail includes a waste heat reuse mechanism evenly installed between a cooling-down area and a heating-up area arranged in parallel. The waste heat reuse mechanism includes a first-order waste heat reuse component and a second-order waste heat reuse component for waste heat reuse;

[0009] The first-stage waste heat reuse component includes a heat absorption pump installed outside the cooling area, a heat absorption cover extending to the upper part inside the cooling area, a U-shaped heat transfer pipe extending to the middle part inside the heating area, and a drain pipe extending to the bottom of the heating area. The inlet end of the heat absorption pump is fixedly communicated with the heat absorption cover, and the outlet end of the heat absorption pump is fixedly communicated with an inclined heat preservation recovery pipe communicated with the U-shaped heat transfer pipe;

[0010] The second-stage waste heat reuse component includes a heat exchange water tank installed at the bottom of the cooling area. The drain pipe is arranged inside the heat exchange water tank and both ends extend to the top of the heat exchange tank. The outside of the drain pipe near the bottom of the cooling area is slidably connected with an outer sleeve pipe fixedly communicated with the cooling area, and a sealing sleeve A is arranged at the end of the drain pipe inside the outer sleeve pipe.

[0011] Preferably, a connecting frame is fixedly connected between the inclined heat preservation recovery pipe and the heat exchange water tank, and a control connector for controlling the opening and closing of the heat absorption pump is installed outside the connecting frame; the critical value of the preset temperature sensor can be set through the control connector.

[0012] Preferably, the heat absorption pump is installed outside the cooling area through a mounting block, and a temperature sensor connected to the controller is installed at the bottom of the heat absorption cover; when the real-time value of the temperature sensor reaches the critical value, a signal will be transmitted to the control connector to control the opening and closing of the heat absorption pump.

[0013] Preferably, the two horizontal pipes of the U-shaped heat transfer pipe are respectively located on the upper and lower sides of the foam ceramics. Output pipes are fixedly communicated with the outer sides of the two horizontal pipes of the U-shaped heat transfer pipe. Outer sealing plates capable of self-resetting are arranged on one side of the two rows of output pipes close to each other; the one-way deflection of the outer sealing plates can avoid the reverse loss of heat during the subsequent heating process in the heating area.

[0014] Preferably, a conical cover is fixedly connected inside the drain pipe. The closed end of the conical cover is close to the heating area, and a blocking ball is arranged inside the conical cover. Limiting springs are symmetrically and fixedly connected between the blocking ball and the drain pipe; the increased air pressure inside the heating area can be relieved by pressing down the blocking ball to prevent potential safety hazards caused by excessive air pressure inside the heating area.

[0015] Preferably, a water inlet and a water outlet are respectively arranged at the upper and lower ends of the heat exchange water tank. Two sealing sleeves B are installed between the drain pipe and the heat exchange water tank. Vertical reset springs are fixedly connected between the bottoms of the two sealing sleeves B and the drain pipe; the vertical reset springs can drive the expanded drain pipe to reset upward.

[0016] Preferably, sealing boxes are symmetrically and fixedly communicated with the outside of the air release pipe. A limiting deflection plate is rotatably connected below the plugging ball. Below the limiting deflection plate, abutting iron blocks slidably connected inside the sealing boxes are symmetrically arranged. A horizontal return spring is fixedly connected between the abutting iron blocks and the sealing boxes. An electromagnetic suction block synchronously opened and closed with the heat absorption pump is embedded at one end of the sealing box far from the abutting iron blocks; when the electromagnetic suction block is activated to adsorb the abutting iron blocks, the limiting effect of the limiting deflection plate on the plugging ball is released.

[0017] Preferably, limiting connection blocks are symmetrically and fixedly connected to the outside of the outer sleeve pipe. A T-shaped through groove is formed in the outside of the limiting connection blocks. One side of the abutting iron block close to the electromagnetic suction block is fixedly connected with a U-shaped connecting rod extending to the outside of the sealing box. A sealing sleeve C is installed between the U-shaped connecting rod and the sealing box. One end of the U-shaped connecting rod far from the sealing sleeve C is fixedly connected with a limiting abutting block for abutting against the limiting connection blocks; when the abutting iron blocks are reset, the limiting effect of the limiting deflection plate on the plugging ball can be restored, so that the air release pipe and the outer sleeve pipe can be expanded to ensure safety.

[0018] In summary, the technical effects and advantages of the present invention are as follows:

[0019] 1. In the present invention, after the foam ceramics completed by high-temperature firing are conveyed to the cooling area through the U-shaped ceramic roller conveying line, the temperature sensor senses the temperature and then starts the heat absorption pump, so that the heat inside the cooling area is absorbed and output through the output pipe to preheat the upper and lower sides of the foam ceramics, that is, the heat inside the cooling area can be timely introduced into the heating area, and the waste heat inside the cooling area is recycled at the first order to save energy.

[0020] 2. In the present invention, when the air pressure inside the heating area increases, it can press down the plugging ball to open the air release pipe for pressure relief, so as to avoid potential safety hazards caused by excessive air pressure inside the heating area, and the heat released through the air release pipe can be heat-exchanged with the water in the heat exchange water tank and then discharged, so that the waste heat inside the heating area can be recycled at the second order to save energy.

[0021] 3. In the present invention, when the inside of the heating area is heated subsequently, the air pressure inside the heating area increases. Since the heat absorption pump stops absorbing heat and the electromagnetic suction block is powered off, the abutting iron blocks are reset to restore the limiting effect of the limiting deflection plate on the plugging ball and release the limiting effect on the air release pipe, that is, the plugging ball is in a closed state and no longer performs pressure relief and heat dissipation, while the air release pipe can move downward for expansion to ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic application structure diagram of a device for recycling waste heat at the kiln tail of the present invention.

[0023] Figure 2Schematic diagram of the external structure of a waste heat reuse device at the kiln tail according to the present invention;

[0024] Figure 3 is Figure 2 an enlarged schematic diagram of the structure at location A in

[0025] Figure 4 Schematic diagram of the internal sectional structure of a waste heat reuse device at the kiln tail according to the present invention;

[0026] Figure 5 is Figure 4 an enlarged schematic diagram of the structure at location B in

[0027] Figure 6 Schematic diagram of the structure of the T-shaped through groove in the present invention.

[0028] In the figure: 100, cooling area; 200, heating area; 300, waste heat reuse mechanism; 310, first-stage waste heat reuse component; 311, heat absorption pump; 312, heat absorption cover; 313, U-shaped heat transfer pipe; 314, air release pipe; 315, inclined heat preservation recovery pipe; 316, mounting block; 317, temperature sensor; 318, output pipe; 319, outer sealing plate; 320, conical cover; 321, sealing ball; 322, limiting spring; 330, second-stage waste heat reuse component; 331, heat exchange water tank; 332, outer sleeve pipe; 333, sealing sleeve A; 334, water inlet; 335, water outlet; 336, sealing sleeve B; 337, vertical reset spring; 338, sealing box; 339, limiting deflection plate; 340, abutting iron block; 341, horizontal reset spring; 342, electromagnetic suction block; 343, limiting connection block; 344, T-shaped through groove; 345, U-shaped connecting rod; 346, sealing sleeve C; 347, limiting abutting block; 350, connecting frame; 360, control connector; 400, firing area. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Refer to Figures 1-6, A waste heat recovery device at the tail of a kiln is shown, including a waste heat recovery mechanism 300 evenly installed between a cooling area 100 and a heating area 200 arranged in parallel. The heating area 200, a firing area 400, and the cooling area 100 form a kiln line. Two kiln lines are arranged in parallel at the head and tail and the conveying directions of producing foam ceramics are opposite. The conveying line of the foam ceramics adopts a ceramic roller conveying line. The specific structures and connection methods of the ceramic roller conveying line, the heating area 200, the firing area 400, and the cooling area 100 all adopt existing technologies. Therefore, they are not elaborated in this embodiment;

[0031] Among them, the waste heat recovery mechanism 300 includes a first-order waste heat recovery component 310 and a second-order waste heat recovery component 330 for waste heat recovery. A connecting frame 350 is fixedly connected between an inclined heat preservation recovery pipe 315 and a heat exchange water tank 331. An external control connector 360 for controlling the opening and closing of a heat absorption pump 311 is installed on the external part of the connecting frame 350;

[0032] Among them, the first-order waste heat recovery component 310 includes a heat absorption pump 311 installed outside the cooling area 100, a heat absorption cover 312 extending to the upper part inside the cooling area 100, a U-shaped heat transfer pipe 313 extending to the middle part inside the heating area 200, and an air discharge pipe 314 extending to the bottom of the heating area 200. The heat absorption pump 311 is installed outside the cooling area 100 through a mounting block 316. The inlet end of the heat absorption pump 311 is fixedly communicated with the heat absorption cover 312. A temperature sensor 317 connected to a controller 360 is installed at the bottom of the heat absorption cover 312. The critical value of the temperature sensor 317 can be preset through the control connector 360. When the real-time value of the temperature sensor 317 reaches the critical value, a signal will be transmitted to the control connector 360 to control the opening and closing of the heat absorption pump 311. The outlet end of the heat absorption pump 311 is fixedly communicated with an inclined heat preservation recovery pipe 315 communicated with the U-shaped heat transfer pipe 313. The heat absorption pump 311 can absorb the heat inside the cooling area 100 into the inclined heat preservation recovery pipe 315 and convey it to the U-shaped heat transfer pipe 313;

[0033] The two horizontal pipes of the U-shaped heat transfer pipe 313 are respectively located on the upper and lower sides of the foam ceramics. Output pipes 318 are fixedly communicated with the outer sides of the two horizontal pipes of the U-shaped heat transfer pipe 313. Self-resetting outer sealing plates 319 are arranged on the sides of the two rows of output pipes 318 close to each other. When the heat passes through the output pipes 318, it can abut against and open the outer sealing plates 319 to preheat the upper and lower sides of the foam ceramics. The one-way deflection of the outer sealing plates 319 can avoid the reverse loss of heat during the subsequent heating process of the heating area 200;

[0034] A conical cover 320 is fixedly connected inside the air release pipe 314. The closed end of the conical cover 320 is close to the heating area 200. A blocking ball 321 is arranged inside the conical cover 320. Symmetrically fixed connection limiting springs 322 are arranged between the blocking ball 321 and the air release pipe 314. After the heat in the cooling area 100 is introduced into the heating area 200, the increased air pressure in the heating area 200 can be relieved by pressing down the blocking ball 321 to prevent potential safety hazards caused by excessive air pressure in the heating area 200;

[0035] Among them, the second-order waste heat reuse component 330 includes a heat exchange water tank 331 installed at the bottom of the cooling area 100. Water inlets 334 and water outlets 335 are respectively arranged at the upper and lower ends of the heat exchange water tank 331. The air release pipe 314 is coiled inside the heat exchange water tank 331 and both ends extend to the top of the heat exchange tank 331. The hot air discharged from the air release pipe 314 can exchange heat with the water in the heat exchange water tank 331. Two sealing sleeves B336 are installed between the air release pipe 314 and the heat exchange water tank 331. Vertical return springs 337 are fixedly connected between the bottoms of the two sealing sleeves B336 and the air release pipe 314. The vertical return springs 337 can drive the expanded air release pipe 314 to reset upward. An outer sleeve 332 fixedly communicated with the cooling area 100 is slidably connected to the outside of the air release pipe 314 near the bottom of the cooling area 100. A sealing sleeve A333 located inside the outer sleeve 332 is arranged at the end of the air release pipe 314. The arrangement of the sealing sleeve A333 can prevent heat from escaping between the air release pipe 314 and the outer sleeve 332;

[0036] Sealing boxes 338 are symmetrically and fixedly communicated with the outside of the air release pipe 314. A limiting deflection plate 339 is rotatably connected below the blocking ball 321. Abutted iron blocks 340 slidably connected inside the sealing boxes 338 are symmetrically arranged below the limiting deflection plate 339. Horizontal return springs 341 are fixedly connected between the abutted iron blocks 340 and the sealing boxes 338. An electromagnetic suction block 342 synchronized with the suction heat pump 311 for opening and closing is embedded at one end of the sealing box 338 away from the abutted iron block 340. When the suction heat pump 311 is started, the electromagnetic suction block 342 is started to adsorb the abutted iron block 340, releasing the limiting effect of the limiting deflection plate 339 on the blocking ball 321;

[0037] Symmetrically and fixedly connected to the outside of the outer sleeve 332 are limit connection blocks 343. A T-shaped through groove 344 is provided on the outside of the limit connection blocks 343. Fixedly connected to the side of the abutting iron block 340 close to the electromagnetic suction block 342 is a U-shaped connecting rod 345 extending outside the sealing box 338. A sealing sleeve C346 is installed between the U-shaped connecting rod 345 and the sealing box 338. The setting of the sealing sleeve C346 can prevent heat from escaping between the U-shaped connecting rod 345 and the sealing box 338. Fixedly connected to the end of the U-shaped connecting rod 345 away from the sealing sleeve C346 is a limit abutting block 347 for abutting against the limit connection block 343. When the abutting iron block 340 is reset, the limiting effect of the limit deflection plate 339 on the blocking ball 321 can be restored, enabling the expansion between the air discharge pipe 314 and the outer sleeve 332 to ensure safety.

[0038] Working principle of the present invention: The foam ceramics that have completed high-temperature firing in a kiln line are conveyed to the cooling area 100 through the ceramic roller conveyor line. When the temperature sensor 317 senses a relatively high temperature, the heat absorption pump 311 is started. When the heat absorption pump 311 is started, the heat inside the cooling area 100 can be absorbed into the inclined heat preservation recovery pipe 315. The heat entering the inclined heat preservation recovery pipe 315 then enters the inside of the U-shaped heat transfer pipe 313 and the output pipe 318 in another kiln line. The heat entering the output pipe 318 will abut against and open the outer blocking plate 319 to preheat the upper and lower sides of the foam ceramics, thereby being able to timely introduce the heat inside the cooling area of one kiln line into the heating area of another kiln line, that is, to perform first-order reuse of the waste heat inside the cooling area 100 to save energy;

[0039] At the same time as the heat absorption pump 311 is started, the electromagnetic suction block 342 is started to adsorb the abutting iron block 340. The abutting iron block 340 squeezes the horizontal return spring 341 and drives the limit abutting block 347 to abut against the limit connection block 343 through the U-shaped connecting rod 345, so as to release the limiting effect of the limit deflection plate 339 on the blocking ball 321 and limit the position of the air discharge pipe 314;

[0040] The heat entering the heating area 200 will cause the air pressure inside the heating area 200 to continuously increase. When the air pressure inside the heating area 200 increases to stretch the limit spring 322, the blocking ball 321 will press down to open the air discharge pipe 314 for pressure relief, so as to avoid potential safety hazards caused by excessive air pressure inside the heating area 200;

[0041] Moreover, the heat discharged through the air discharge pipe 314 can exchange heat with the water in the heat exchange water tank 331 and then be discharged, thereby being able to perform second-order reuse of the waste heat inside the heating area 200 to save energy;

[0042] When the temperature sensor 317 senses a relatively low temperature, the heat absorption pump 311 is turned off to stop heat absorption. The electromagnetic suction block 342 is powered off, and the abutting iron block 340 resets, enabling the limit deflection plate 339 to resume the limiting effect on the plugging ball 321 and releasing the limiting effect on the air discharge pipe 314;

[0043] After that, if the inside of the temperature rising area 200 is heated (depending on the situation), the air pressure inside the temperature rising area 200 increases. The plugging ball 321 is in the closed state and no longer discharges pressure for heat dissipation. The air discharge pipe 314 can move downward for expansion to ensure safety.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A kiln tail waste heat recycling device, comprising a waste heat recycling mechanism (300) evenly installed between a cooling area (100) and a heating area (200) arranged in parallel, characterized in that: The waste heat recycling mechanism (300) comprises a first-stage waste heat recycling component (310) and a second-stage waste heat recycling component (330) for recycling waste heat; The first-stage waste heat recycling element (310) comprises a heat absorption pump (311) installed outside the cooling area (100), a heat absorption cover (312) extending to the upper part of the cooling area (100), a U-shaped heat transfer pipe (313) extending to the middle part of the heating area (200), and an air release pipe (314) extending to the bottom of the heating area (200); the inlet end of the heat absorption pump (311) is fixedly connected to the heat absorption cover (312), and the outlet end of the heat absorption pump (311) is fixedly connected to an inclined heat preservation recovery pipe (315) connected to the U-shaped heat transfer pipe (313); The second-stage waste heat recycling element (330) comprises a heat exchange water tank (331) installed at the bottom of the cooling area (100); the air venting pipe (314) is coiled inside the heat exchange water tank (331) and both ends extend to the top of the heat exchange tank (331); the air venting pipe (314) is slidably connected to an outer sleeve (332) fixedly connected to the cooling area (100) near the bottom of the cooling area (100); and a sealing sleeve A (333) located inside the outer sleeve (332) is provided at the end of the air venting pipe (314).

2. The kiln tail waste heat recycling device according to claim 1 is characterized in that: A connecting frame (350) is fixedly connected between the inclined heat-insulating recovery pipe (315) and the heat exchange water tank (331), and a control connector (360) for controlling the opening and closing of the heat absorption pump (311) is installed outside the connecting frame (350).

3. The kiln tail waste heat recycling device according to claim 2 is characterized in that: The heat absorption pump (311) is installed outside the temperature reduction area (100) via a mounting block (316), and a temperature sensor (317) connected to a controller (360) is installed at the bottom of the heat absorption cover (312).

4. The kiln tail waste heat recycling device according to claim 1 is characterized in that: The two horizontal tubes of the U-shaped heat transfer tube (313) are respectively located at the upper and lower sides of the foam ceramic, and the outer sides of the two horizontal tubes of the U-shaped heat transfer tube (313) are fixedly connected with output tubes (318), and the sides of the two rows of output tubes (318) close to each other are provided with external sealing plates (319) that can reset themselves.

5. The kiln tail waste heat recycling device according to claim 1 is characterized in that: A conical cover (320) is fixedly connected to the interior of the vent pipe (314), the closing end of the conical cover (320) is close to the temperature rising area (200), a sealing ball (321) is arranged inside the conical cover (320), and a limit spring (322) is symmetrically fixedly connected between the sealing ball (321) and the vent pipe (314).

6. The kiln tail waste heat recycling device according to claim 1 is characterized in that: The upper and lower ends of the heat exchange water tank (331) are respectively provided with a water inlet (334) and a water outlet (335); two sealing sleeves B (336) are installed between the air release pipe (314) and the heat exchange water tank (331); and vertical return springs (337) are fixedly connected between the bottoms of the two sealing sleeves B (336) and the air release pipe (314).

7. The kiln tail waste heat recycling device according to claim 5 is characterized in that: The outside of the vent pipe (314) is symmetrically fixedly connected to a sealing box (338), the bottom of the blocking ball (321) is rotatably connected to a limit deflection plate (339), and a contact iron block (340) slidably connected to the inside of the sealing box (338) is symmetrically arranged below the limit deflection plate (339), a horizontal return spring (341) is fixedly connected between the contact iron block (340) and the sealing box (338), and an electromagnetic suction block (342) that opens and closes synchronously with the heat absorption pump (311) is embedded at one end of the sealing box (338) away from the contact iron block (340).

8. The kiln tail waste heat recycling device according to claim 7, characterized in that: The outer portion of the outer sleeve (332) is symmetrically fixedly connected to a limit connection block (343), the outer portion of the limit connection block (343) is provided with a T-shaped through groove (344), the side of the abutting iron block (340) close to the electromagnetic suction block (342) is fixedly connected to a U-shaped connecting rod (345) extending to the outside of the sealing box (338), a sealing sleeve C (346) is installed between the U-shaped connecting rod (345) and the sealing box (338), and the end of the U-shaped connecting rod (345) away from the sealing sleeve C (346) is fixedly connected to a limit abutting block (347) for abutting the limit connection block (343).

Images