Tail gas waste heat recycling device of thermal desorption kiln

Abstract

The invention relates to the technical field of waste heat utilization, and discloses a thermal desorption kiln tail gas waste heat recycling device which comprises a thermal desorption kiln, an exhaust fan is installed at the tail gas emission end of the thermal desorption kiln, a heat exchange unit is arranged on one side of the exhaust fan and comprises an exchange chamber, a heat exchange module is arranged in the exchange chamber, and the heat exchange module is connected with the exhaust fan. The heat exchange module comprises a supporting ring, the two ends of the supporting ring are rotationally connected with partition plates, and scraping mechanisms are arranged between the partition plates and the supporting ring. An adjusting mechanism is arranged on the supporting ring and comprises an adjusting plate, and the adjusting plate, the supporting ring and the partition plate form an exchange cavity. The adjusting plate is arranged to adjust the space for tail gas to exchange heat with the cooling medium when the tail gas passes, so that when the tail gas flow is large, the space is increased to reduce the tail gas flow speed and ensure sufficient heat exchange time, and when the tail gas flow is small, the space is reduced to enable the tail gas to be better attached to the partition plate, and heat exchange is more thorough.

Description

Technical Field

[0001] The invention belongs to the technical field of waste heat utilization, and in particular relates to a device for recycling waste heat of thermal desorption kiln tail gas. Background Art

[0002] Thermal desorption technology has the advantages of short remediation cycle and fast remediation speed, and is widely used in the remediation of organic contaminated soil. However, since organic pollutants often have a high boiling point, the soil needs to be heated at a high temperature during the thermal desorption remediation process, which will produce a large amount of high-temperature exhaust gas. High-temperature exhaust gas brings about the problems of heat loss and difficulty in exhaust gas treatment. Therefore, scientific researchers and technical developers are working hard to solve the problems of heat loss and waste heat reuse in the remediation process by improving remediation methods and improving system design.

[0003] The Chinese patent application with authorization announcement number CN214223795U discloses a waste heat recovery system for direct thermal desorption of contaminated soil. The heat of flue gas and exhaust gas in the direct thermal desorption process is recovered by a heat exchanger to preheat the air. The preheated air is used to preheat the soil and the system combustion air to achieve the purpose of improving energy utilization. The air is heated by the heat exchanger to realize the heat return of flue gas and exhaust gas. The generated hot air is used for fuel combustion to improve energy utilization. At the same time, the exhaust gas is cooled after heat exchange, which is beneficial to subsequent purification treatment and improves the efficiency of subsequent purification equipment.

[0004] However, the technical solution still has at least the following defects: when the flow rate of exhaust gas changes, the channel space of heat exchange needs to be changed to make the heat exchange more efficient; when the flow rate increases, the smaller channel will cause the exhaust gas to be transported too fast, making the heat exchange time too short; when the flow rate decreases, the exhaust gas escapes in the channel and it is difficult to fully perform heat exchange; the above solution does not have the function of regulating the channel space, and the above solution does not have the dust removal function, and dust adhesion after long-term use will cause the heat exchange efficiency to be greatly reduced. In view of this, the present invention is proposed. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a thermal desorption kiln exhaust gas waste heat recycling device, which adjusts the space for heat exchange between the exhaust gas and the cooling medium when the exhaust gas passes through by setting an adjustment plate, so that when the exhaust gas flow rate is large, the space is increased to reduce the exhaust gas flow rate to ensure that the heat exchange time is sufficient, and when the exhaust gas flow rate is small, the space is reduced to make the exhaust gas fit more closely to the partition plate to ensure more thorough heat exchange; a scraper is set to scrape off the dust adhered to the partition plate to prevent dust accumulation from causing poor heat exchange effect, and the scraped dust is concentrated into the ring for easy cleaning.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A thermal desorption kiln tail gas waste heat recycling device comprises a thermal desorption kiln, an exhaust fan is installed at one end of the thermal desorption kiln tail gas discharge, a heat exchange unit is arranged on one side of the exhaust fan, the heat exchange unit comprises an exchange chamber, a heat exchange module is arranged inside the exchange chamber, the heat exchange module comprises a support ring, partition plates are rotatably connected at both ends of the support ring, a scraping mechanism is arranged between the partition plate and the support ring, and the scraping mechanism is used to scrape dust on the partition plate;

[0008] The support ring is provided with an adjustment mechanism, the adjustment mechanism comprises an adjustment plate, the adjustment plate, the support ring and the partition plate form an exchange cavity, and the adjustment mechanism changes the thickness of the exchange cavity through the adjustment plate;

[0009] An impact unit is arranged at one side of the heat exchange unit. The impact unit includes an impact module. The impact module includes an air cylinder. A piston is slidably installed inside the air cylinder. A reset mechanism is arranged at the bottom of the air cylinder. The reset mechanism is used to drive the air cylinder to reset.

[0010] As a preferred embodiment of the present invention, a through groove is provided on the inner wall of the support ring, a connecting piece is also fixedly installed on the inner wall of the support ring, the adjustment plate is slidably installed in the connecting piece, a plurality of openings are provided on the connecting piece, a through hole is provided on the partition plate, an outer through ring and an inner through ring are installed on the partition plate between two adjacent heat exchange modules, and the space between the outer through ring and the inner through ring and the exchange chamber, the through groove and the opening on the connecting piece form a channel for the exhaust gas to pass through.

[0011] As a preferred embodiment of the present invention, the scraping mechanism includes a scraper, which is movably plugged into an adjusting plate. A collecting mechanism is arranged in the middle of the adjusting mechanism. The collecting mechanism is used to collect dust scraped by the scraping mechanism. The collecting mechanism includes a sleeve ring, which is provided with an open groove. The position of the open groove is adapted to the scraper, the sleeve ring is arranged at intervals from the inner ring, and a sealing cover and a mounting tube are respectively installed at both ends of the collecting mechanism.

[0012] As a preferred embodiment of the present invention, the adjustment mechanism also includes a first spring installed between two adjacent adjustment plates, and a pull rod is rotatably installed on one side of the adjustment plate, and a counterweight block is rotatably installed on one end of the pull rod. The counterweight block moves in the horizontal direction when the rotation speed of the adjustment plate changes, and the adjustment plate moves in the vertical direction through the pull rod.

[0013] As a preferred embodiment of the present invention, a layer plate is fixedly installed inside the exchange chamber, and the layer plate is located between two adjacent heat exchange modules. The exchange chamber, the layer plate, the partition plate, the outer ring and the support ring form a channel for the circulation of the cooling medium. The upper and lower ends of the exchange chamber are respectively sealed with the sealing cover and the mounting pipe. A support plate is fixedly installed on the layer plate, and the support plate is fixedly connected to the partition plate.

[0014] As a preferred embodiment of the present invention, an exhaust gas inlet pipe is sealedly installed at one end of the exhaust fan, and the exhaust gas inlet pipe is connected to the top of the sealing cover. An exhaust gas outlet pipe is installed on one side of the installation pipe. The impact module also includes a branch pipe, and the branch pipe is seal-connected to the air cylinder. A sealing gasket is arranged at the bottom of the branch pipe, and a tension spring is installed between the sealing gasket and the inner wall of the branch pipe. The diameter of the sealing gasket is smaller than the diameter of the piston. A conduit is installed on one side of the top of the air cylinder, and one end of the conduit is connected to the top of the sealing cover and is connected to the collection mechanism.

[0015] As a preferred embodiment of the present invention, the impact unit further includes a lock control module, the lock control module includes a fixing member and a limit block, one side of the fixing member is rotatably connected to a lever, one side of the lever is installed with a baffle, the limit block is slidably connected to a slide rod, the top of the slide rod is fixedly installed with a connecting block, and the connecting block is adapted to the baffle and the lever;

[0016] The reset mechanism includes an insertion rod, which passes through the air cylinder and is fixedly connected to the piston. A mounting plate is fixedly installed on the bottom of the insertion rod, and the mounting plate is fixedly connected to the connecting block. A second spring is movably sleeved on the insertion rod, and both ends of the second spring are fixedly connected to the mounting plate and the fixing piece.

[0017] As a preferred embodiment of the present invention, a transmission mechanism is provided at the bottom of the lock control module, and the transmission mechanism includes a rotating plate, which is rotatably connected to the bottom of the exchange chamber, and a sliding groove is opened at one end of the rotating plate, and a blocking rod is slidably installed in the sliding groove, and the blocking rod is fixedly connected to the bottom of the sliding rod, a sliding plate is fixedly installed on one side of the mounting tube, a sliding block is slidably installed on the sliding block, a support rod is fixedly installed on the sliding block, a mounting piece is movably sleeved on the support rod, a connecting rod is rotatably installed on one side of the mounting piece, and the connecting rod is fixedly connected to the bottom of the rotating plate.

[0018] As a preferred embodiment of the present invention, a connecting plate is rotatably sleeved on the bottom of the mounting tube, a locking plate is rotatably installed on the connecting plate, a cover plate is installed on the bottom of the mounting tube, the locking plate is adapted to the cover plate, a first gear is rotatably fixedly installed on the locking plate, a first gear ring is rotatably installed on the outer side of the mounting tube, the first gear ring is meshed with the first gear, a push rod is rotatably installed on one side of the connecting plate, and the push rod is rotatably connected to the support rod.

[0019] As a preferred embodiment of the present invention, a driving mechanism is provided on one side of the interior of the exchange chamber, and the driving mechanism includes a second gear, and the second gear is installed with a power device through a transmission shaft, and the power device is installed at the bottom of the exchange chamber. One side of the second gear is meshed and connected with a second gear ring, and the second gear ring is fixedly installed on the outside of the support ring.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention adjusts the space for heat exchange between the exhaust gas and the cooling medium when the exhaust gas passes through by setting an adjustment plate, so that when the exhaust gas flow rate is large, the space is increased to reduce the exhaust gas flow rate to ensure sufficient heat exchange time, and when the exhaust gas flow rate is small, the space is reduced to make the exhaust gas fit more closely to the partition plate to ensure more thorough heat exchange;

[0022] The present invention scrapes off the dust adhered to the partition plate by arranging a scraper, thereby preventing the accumulation of dust from causing poor heat exchange effect. At the same time, the scraped dust is concentrated into the sleeve ring for easy cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the installation state of a thermal desorption kiln tail gas waste heat recycling device of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of a thermal desorption kiln tail gas waste heat recycling device of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the second gear of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal structure of the exchange chamber of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the layer plate of the present invention;

[0028] Figure 6 This is a structural schematic diagram of the heat exchange module of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the partition plate of the present invention in a separated state;

[0030] Figure 8 This is a schematic diagram of the structure of the support ring of the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the adjustment plate of the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the outer through ring and the inner through ring of the present invention;

[0033] Fig.11It is a schematic diagram of the structure of the collar of the present invention;

[0034] Fig.12 This is a schematic diagram of the structure of the installation pipe of the present invention;

[0035] Fig.13 It is a structural schematic diagram of the fixing part of the present invention;

[0036] Fig.14 It is a structural schematic diagram of the tension spring of the present invention;

[0037] Fig.15 It is a structural schematic diagram of the locking plate of the present invention.

[0038] Reference numerals:

[0039] 100. thermal desorption kiln; 101. exhaust fan; 102. tail gas inlet pipe; 103. tail gas outlet pipe;

[0040] 200, exchange chamber; 201, layer plate; 202, support plate; 203, partition plate; 204, through hole; 205, outer through ring; 206, inner through ring;

[0041] 300, support ring; 301, through groove; 302, connecting piece; 303, scraper; 304, adjustment plate; 305, first spring; 306, pull rod; 307, counterweight;

[0042] 400, sealing cover; 401, collar; 402, opening groove; 403, mounting tube;

[0043] 500, branch pipe; 501, air cylinder; 502, fixing piece; 503, sealing pad; 504, tension spring; 505, piston; 506, plug rod; 507, second spring; 508, mounting plate; 509, conduit; 510, connecting block; 511, lever; 512, baffle plate; 513, slide bar; 514, limit block; 515, baffle bar; 516, rotating plate; 517, slide groove; 518, connecting rod; 519, mounting piece; 520, slide plate; 521, slider; 522, push rod; 523, support rod; 524, connecting plate; 525, lock plate; 526, first gear; 527, first gear ring; 528, cover plate;

[0044] 600, second gear ring; 601, second gear; 602, power device. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0046] Embodiment 1:

[0047] like Figures 1 to 15 As shown, a thermal desorption kiln tail gas waste heat recycling device comprises a thermal desorption kiln 100, wherein an exhaust fan 101 is installed at one end of the thermal desorption kiln 100 for exhaust gas discharge, and is characterized in that a heat exchange unit is arranged on one side of the exhaust fan 101, and the heat exchange unit comprises an exchange chamber 200, and a heat exchange module is arranged inside the exchange chamber 200, and the heat exchange module comprises a support ring 300, and a partition plate 203 is rotatably connected at both ends of the support ring 300, and a scraping mechanism is arranged between the partition plate 203 and the support ring 300, and the scraping mechanism is used to scrape dust on the partition plate 203;

[0048] The support ring 300 is provided with an adjustment mechanism, which includes an adjustment plate 304. The adjustment plate 304, the support ring 300 and the partition plate 203 form an exchange cavity. The adjustment mechanism changes the thickness of the exchange cavity through the adjustment plate 304.

[0049] An impact unit is arranged on one side of the heat exchange unit. The impact unit includes an impact module. The impact module includes an air cylinder 501. A piston 505 is slidably installed inside the air cylinder 501. A reset mechanism is arranged at the bottom of the air cylinder 501. The reset mechanism is used to drive the air cylinder 501 to reset.

[0050] like Figure 6 , Figure 7 , Figure 8 , Fig.10 As shown, in a specific embodiment, a through groove 301 is provided on the inner wall of the support ring 300, a connector 302 is fixedly installed on the inner wall of the support ring 300, an adjustment plate 304 is slidably installed in the connector 302, a plurality of openings are provided on the connector 302, a through hole 204 is provided on the partition plate 203, an outer through ring 205 and an inner through ring 206 are installed on the partition plate 203 between two adjacent heat exchange modules, and the space between the outer through ring 205 and the inner through ring 206 and the exchange cavity, the through groove 301 and the opening on the connector 302 form a channel for the exhaust gas to pass through. In this configuration, when the exhaust gas passes through, it exchanges heat with the cooling medium through the partition plate 203.

[0051] like Figure 6 , Figure 7 , Figure 8 , Fig.10 , Fig.12As shown, further, the scraping mechanism includes a scraper 303, which is movably plugged into the adjustment plate 304, and a collecting mechanism is arranged in the middle of the adjustment mechanism. The collecting mechanism is used to collect the dust scraped by the scraping mechanism, and the collecting mechanism includes a collar 401, on which an opening groove 402 is opened, and the position of the opening groove 402 is adapted to the scraper 303, and the collar 401 is arranged at intervals with the inner through ring 206, and the two ends of the collecting mechanism are respectively installed with a sealing cover 400 and a mounting tube 403. In this setting, the scraper 303 scrapes off the dust adhered to the partition plate 203 during rotation, and enters the collar 401 through the opening groove 402, and at the same time, the dust on the partition plate 203 at the bottom enters the mounting tube 403 through the through hole 204.

[0052] like Figure 8 , Fig. 9 As shown, further, the regulating mechanism also includes a first spring 305 installed between two adjacent regulating plates 304, and a pull rod 306 is rotatably installed on one side of the regulating plate 304, and a counterweight 307 is rotatably installed on one end of the pull rod 306. The counterweight 307 moves in the horizontal direction when the rotation speed of the regulating plate 304 changes, and the regulating plate 304 moves in the vertical direction through the pull rod 306. In this setting, the centrifugal force of the counterweight 307 is different due to the different rotation speeds of the regulating plate 304, and then the offset degree of the counterweight 307 is different. The distance between the regulating plate 304 and the partition plate 203 is changed through the pull rod 306. When the exhaust gas is small, the distance is reduced so that the exhaust gas fully fits the partition plate 203. When the exhaust gas is large, the distance is increased to reduce the flow rate of the exhaust gas.

[0053] like Figure 4-Figure 7 As shown, further, a layer plate 201 is fixedly installed inside the exchange chamber 200, and the layer plate 201 is located between two adjacent heat exchange modules. The exchange chamber 200, the layer plate 201, the partition plate 203, the outer ring 205 and the support ring 300 form a channel for the circulation of the cooling medium. The upper and lower ends of the exchange chamber 200 are respectively sealed with the sealing cover 400 and the mounting pipe 403. The support plate 202 is fixedly installed on the layer plate 201, and the support plate 202 is fixedly connected to the partition plate 203. In this configuration, the cooling medium is input from the exchange chamber 200 from top to bottom, and heat is exchanged with the exhaust gas under the action of the layer plate 201.

[0054] The diameters of the exhaust gas inlet pipe 102 and the exhaust gas outlet pipe 103 are relatively small, so that a relatively large pressure is generated in the exhaust gas inlet pipe 102 when the exhaust fan 101 is working.

[0055] Embodiment 2:

[0056] like Figure 2 , Figure 3 , Fig.14As shown, in a specific embodiment, an exhaust gas inlet pipe 102 is sealed and installed at one end of the exhaust fan 101, and the exhaust gas inlet pipe 102 is connected to the top of the sealing cover 400. An exhaust gas outlet pipe 103 is installed on one side of the installation pipe 403. The impact module also includes a branch pipe 500, which is sealed and connected to the air cylinder 501. A sealing gasket 503 is arranged at the bottom of the branch pipe 500, and a tension spring 504 is installed between the sealing gasket 503 and the inner wall of the branch pipe 500. The diameter of the sealing gasket 503 is smaller than the diameter of the piston 505. A conduit 509 is installed on one side of the top of the air cylinder 501, and one end of the conduit 509 is connected to the top of the sealing cover 400 and connected to the collection mechanism. In this setting, the sealing gasket 503 blocks the branch pipe 500 under the action of the tension spring 504, so that when the piston 505 is reset, the airflow can only be transported to the sealing cover 400 through the conduit 509, and the dust adhering to the inner wall of the collar 401 is blown away to a certain extent to prevent dust accumulation.

[0057] like Figure 13-Figure 15 As shown, further, the impact unit also includes a lock control module, which includes a fixing member 502 and a limit block 514, one side of the fixing member 502 is rotatably connected to a lever 511, one side of the lever 511 is installed with a baffle 512, a slide bar 513 is slidably connected to the limit block 514, and a connecting block 510 is fixedly installed on the top of the slide bar 513, and the connecting block 510 is adapted to the baffle 512 and the lever 511;

[0058] The reset mechanism includes an insertion rod 506, which penetrates the gas cylinder 501 and is fixedly connected to the piston 505. A mounting plate 508 is fixedly installed at the bottom of the insertion rod 506, and the mounting plate 508 is fixedly connected to the connecting block 510. A second spring 507 is movably sleeved on the insertion rod 506, and both ends of the second spring 507 are fixedly connected to the mounting plate 508 and the fixing member 502. In this arrangement, when use is completed, the baffle 512 is separated from the connecting block 510 by pulling the lever 511. At this time, the pulling force of the second spring 507 drives the mounting plate 508 to reset, thereby resetting the piston 505.

[0059] like Fig.15As shown, further, a transmission mechanism is provided at the bottom of the lock control module, and the transmission mechanism includes a rotating plate 516, and the rotating plate 516 is rotatably connected to the bottom of the exchange chamber 200. A slide groove 517 is provided at one end of the rotating plate 516, and a blocking rod 515 is slidably installed in the slide groove 517. The blocking rod 515 is fixedly connected to the bottom of the slide rod 513, and a slide plate 520 is fixedly installed on one side of the mounting tube 403. A slider 521 is slidably installed on the slide plate 520, and a support rod 523 is fixedly installed on the slider 521. A mounting member 519 is movably sleeved on the support rod 523, and a connecting member 519 is rotatably installed on one side of the mounting member 519. Rod 518, connecting rod 518 is fixedly connected to the bottom of rotating plate 516, the bottom of mounting tube 403 is rotatably sleeved with connecting plate 524, connecting plate 524 is rotatably mounted with locking plate 525, the bottom of mounting tube 403 is mounted with cover plate 528, locking plate 525 is matched with cover plate 528, locking plate 525 is rotatably fixedly mounted with first gear 526, the outer side of mounting tube 403 is mounted with first gear ring 527, first gear ring 527 and first gear 526 are meshed with each other, a push rod 522 is rotatably mounted on one side of connecting plate 524, and push rod 522 is rotatably connected with support rod 523. In this arrangement, the movement of the mounting plate 508 drives the connecting block 510 to move, the connecting block 510 drives the slide rod 513 to descend, and drives the rotating plate 516 to rotate through the blocking rod 515, the other end of the rotating plate 516 drives the support rod 523 to slide through the connecting rod 518 and the mounting member 519, the support rod 523 rotates the connecting plate 524 by resisting against the push rod 522, the connecting plate 524 drives the locking plate 525 and the first gear 526 to revolve around the mounting tube 403, the first gear 526 rotates in meshing with the first gear ring 527, thereby causing the locking plate 525 to rotate and lock the cover plate 528.

[0060] like Figure 3 As shown, in a specific embodiment, a driving mechanism is provided on one side of the interior of the exchange chamber 200, and the driving mechanism includes a second gear 601, and the second gear 601 is installed with a power device 602 through a transmission shaft, and the power device 602 is installed at the bottom of the exchange chamber 200, and one side of the second gear 601 is meshedly connected with a second gear ring 600, and the second gear ring 600 is fixedly installed on the outside of the support ring 300. In this setting, the power device 602 drives the second gear ring 600 to work through the second gear 601, and the power device 602 uses a permanent magnet motor and a frequency conversion device, which is convenient for adjusting the speed.

[0061] The implementation principle of the thermal desorption kiln tail gas waste heat recycling device of this embodiment is as follows: when working, the exhaust fan 101 works and the tail gas enters the sealing cover 400 through the tail gas inlet pipe 102, passes through the through hole 204 and the outer through ring 205 and the inner through ring 206 in turn to enter each heat exchange module, and is discharged through the tail gas outlet pipe 103. At the same time, the cooling medium is input from the exchange chamber 200 from top to bottom, and heat exchanges with the tail gas under the action of the layer plate 201;

[0062] Since the diameters of the exhaust gas inlet pipe 102 and the exhaust gas outlet pipe 103 are relatively small, when the exhaust fan 101 is working, the pressure at the exhaust gas inlet pipe 102 is relatively large, and the increased pressure acts on the sealing gasket 503 and the piston 505 through the branch pipe 500, and causes the piston 505 to move downward. When the piston 505 moves downward, it drives the mounting plate 508 to move through the plug rod 506 to stretch the second spring 507;

[0063] The installation plate 508 moves while driving the connecting block 510 to move. The connecting block 510 drives the sliding rod 513 to descend, and drives the rotating plate 516 to rotate through the blocking rod 515. The other end of the rotating plate 516 drives the supporting rod 523 to slide through the connecting rod 518 and the installation member 519. The supporting rod 523 rotates the connecting plate 524 by abutting against the push rod 522. The connecting plate 524 drives the locking plate 525 and the first gear 526 to revolve around the installation tube 403. The first gear 526 rotates under the action of meshing with the first gear ring 527, thereby causing the locking plate 525 to rotate and lock the cover plate 528.

[0064] When working, the power device 602 drives the second gear ring 600 to work through the second gear 601, and the second gear ring 600 drives the support ring 300 to work. When the support ring 300 rotates, the scraper 303 is driven to rotate through the connecting piece 302 and the adjustment plate 304. During the rotation of the scraper 303, the dust adhered to the partition plate 203 is scraped off and enters the ring 401 through the opening groove 402. At the same time, the dust on the partition plate 203 at the bottom enters the installation tube 403 through the through hole 204;

[0065] When the exhaust gas generated by the thermal desorption kiln 100 is large, the sensor detects that the exhaust gas emission exceeds the standard. At this time, the exhaust fan 101 increases the exhaust force, so that the pressure at the exhaust gas inlet pipe 102 increases. The increased pressure acts on the air cylinder 501, causing the piston 505 to further descend, and drives the connecting block 510 to further descend. At the same time, the lever 511 deflects under the action of gravity, and the baffle 512 on one side of it abuts against the connecting block 510;

[0066] The power device 602 increases the rotation speed, so that the rotation speeds of the scraper 303 and the adjustment plate 304 increase. The scraper 303 not only scrapes the partition plate 203, but also has the function of disturbing the exhaust gas, so that the exhaust gas can contact the partition plate 203 more comprehensively. The increase in the rotation speed of the adjustment plate 304 causes the counterweight block 307 to deviate outward by a greater distance under the action of centrifugal force, and then the adjustment plate 304 is pulled away from the partition plate 203 by the pull rod 306, increasing the space, so that the residence time of the exhaust gas increases when it enters, and avoids the exhaust gas from having too short a heat exchange time with the cooling medium due to too fast a flow rate;

[0067] When use is finished, the baffle 512 is disengaged from the connecting block 510 by pulling the lever 511. At this time, the tension of the second spring 507 drives the mounting plate 508 to reset, thereby resetting the piston 505. At the same time, the sealing gasket 503 blocks the branch pipe 500 under the action of the tension spring 504, so that when the piston 505 is reset, the airflow can only be delivered to the sealing cover 400 through the conduit 509, and the dust adhered to the inner wall of the ring 401 is blown away to a certain extent to prevent dust accumulation.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A device for recycling waste heat of tail gas from a thermal desorption kiln, comprising a thermal desorption kiln (100), wherein an exhaust fan (101) is installed at one end of the tail gas discharge of the thermal desorption kiln (100), characterized in that: A heat exchange unit is arranged on one side of the exhaust fan (101), the heat exchange unit comprising an exchange chamber (200), a heat exchange module is arranged inside the exchange chamber (200), the heat exchange module comprises a support ring (300), both ends of the support ring (300) are rotatably connected with a partition plate (203), a scraping mechanism is arranged between the partition plate (203) and the support ring (300), and the scraping mechanism is used to scrape dust on the partition plate (203); The support ring (300) is provided with an adjustment mechanism, the adjustment mechanism comprising an adjustment plate (304), the adjustment plate (304) and the support ring (300) and the partition plate (203) forming an exchange chamber, and the adjustment mechanism changes the thickness of the exchange chamber through the adjustment plate (304); An impact unit is arranged on one side of the heat exchange unit, the impact unit comprises an impact module, the impact module comprises an air cylinder (501), a piston (505) is slidably mounted inside the air cylinder (501), a reset mechanism is arranged at the bottom of the air cylinder (501), and the reset mechanism is used to drive the air cylinder (501) to reset.

2. A thermal desorption kiln tail gas waste heat recycling device according to claim 1, characterized in that: The inner wall of the support ring (300) is provided with a through groove (301), and a connecting piece (302) is also fixedly installed on the inner wall of the support ring (300). The adjustment plate (304) is slidably installed in the connecting piece (302), and a plurality of openings are provided on the connecting piece (302). A through hole (204) is provided on the partition plate (203), and an outer through ring (205) and an inner through ring (206) are installed on the partition plate (203) between two adjacent heat exchange modules. The space between the outer through ring (205) and the inner through ring (206) and the exchange chamber, the through groove (301) and the opening on the connecting piece (302) form a channel for the exhaust gas to pass through.

3. A thermal desorption kiln tail gas waste heat recycling device according to claim 2, characterized in that: The scraping mechanism comprises a scraper (303), wherein the scraper (303) is movably plugged into an adjusting plate (304), a collecting mechanism is arranged in the middle of the adjusting mechanism, and the collecting mechanism is used to collect dust scraped by the scraping mechanism, the collecting mechanism comprises a sleeve ring (401), an open groove (402) is provided on the sleeve ring (401), the position of the open groove (402) is adapted to the scraper (303), the sleeve ring (401) is arranged at intervals from the inner ring (206), and a sealing cover (400) and a mounting tube (403) are respectively installed at both ends of the collecting mechanism.

4. A thermal desorption kiln tail gas waste heat recycling device according to claim 3, characterized in that: The adjustment mechanism also includes a first spring (305) installed between two adjacent adjustment plates (304), and a pull rod (306) is rotatably installed on one side of the adjustment plate (304), and a counterweight (307) is rotatably installed on one end of the pull rod (306). The counterweight (307) moves in the horizontal direction when the rotation speed of the adjustment plate (304) changes, and causes the adjustment plate (304) to move in the vertical direction through the pull rod (306).

5. A thermal desorption kiln tail gas waste heat recycling device according to claim 4, characterized in that: A layer plate (201) is fixedly installed inside the exchange chamber (200), and the layer plate (201) is located between two adjacent heat exchange modules. The exchange chamber (200), the layer plate (201), the partition plate (203), the outer ring (205) and the support ring (300) form a channel for the circulation of cooling medium. The upper and lower ends of the exchange chamber (200) are respectively sealed with a sealing cover (400) and a mounting pipe (403). A support plate (202) is fixedly installed on the layer plate (201), and the support plate (202) is fixedly connected to the partition plate (203).

6. A thermal desorption kiln tail gas waste heat recycling device according to claim 5, characterized in that: An exhaust gas inlet pipe (102) is sealedly installed at one end of the exhaust fan (101), and the exhaust gas inlet pipe (102) is connected to the top of the sealing cover (400). An exhaust gas outlet pipe (103) is installed on one side of the installation pipe (403). The impact module also includes a branch pipe (500), and the branch pipe (500) is sealed and connected to the air cylinder (501). A sealing gasket (503) is arranged at the bottom of the branch pipe (500), and a tension spring (504) is installed between the sealing gasket (503) and the inner wall of the branch pipe (500). The diameter of the sealing gasket (503) is smaller than the diameter of the piston (505). A conduit (509) is installed on one side of the top of the air cylinder (501), and one end of the conduit (509) is connected to the top of the sealing cover (400) and is connected to the collection mechanism.

7. A thermal desorption kiln tail gas waste heat recycling device according to claim 6, characterized in that: The impact unit also includes a lock control module, which includes a fixing member (502) and a limit block (514); one side of the fixing member (502) is rotatably connected to a lever (511); one side of the lever (511) is provided with a baffle (512); a slide bar (513) is slidably connected to the limit block (514); a connecting block (510) is fixedly installed on the top of the slide bar (513); and the connecting block (510) is adapted to the baffle (512) and the lever (511); The reset mechanism comprises an insertion rod (506), wherein the insertion rod (506) passes through the air cylinder (501) and is fixedly connected to the piston (505); a mounting plate (508) is fixedly installed at the bottom of the insertion rod (506); the mounting plate (508) is fixedly connected to the connecting block (510); a second spring (507) is movably sleeved on the insertion rod (506); and two ends of the second spring (507) are fixedly connected to the mounting plate (508) and the fixing member (502).

8. The thermal desorption kiln tail gas waste heat recycling device according to claim 7, characterized in that: A transmission mechanism is provided at the bottom of the lock control module, and the transmission mechanism includes a rotating plate (516), and the rotating plate (516) is rotatably connected to the bottom of the exchange chamber (200). A sliding groove (517) is opened at one end of the rotating plate (516), and a blocking rod (515) is slidably installed in the sliding groove (517), and the blocking rod (515) is fixedly connected to the bottom of the sliding rod (513); a sliding plate (520) is fixedly installed on one side of the mounting tube (403), and a sliding block (521) is slidably installed on the sliding plate (520), and a supporting rod (523) is fixedly installed on the sliding block (521), and a mounting member (519) is movably sleeved on the supporting rod (523), and a connecting rod (518) is rotatably installed on one side of the mounting member (519), and the connecting rod (518) is fixedly connected to the bottom of the rotating plate (516).

9. A thermal desorption kiln tail gas waste heat recycling device according to claim 8, characterized in that: A connecting plate (524) is rotatably sleeved at the bottom of the mounting tube (403), a locking plate (525) is rotatably mounted on the connecting plate (524), a cover plate (528) is mounted at the bottom of the mounting tube (403), the locking plate (525) is matched with the cover plate (528), a first gear (526) is rotatably fixedly mounted on the locking plate (525), a first gear ring (527) is mounted on the outer side of the mounting tube (403), the first gear ring (527) and the first gear (526) are meshed with each other, a push rod (522) is rotatably mounted on one side of the connecting plate (524), and the push rod (522) is rotatably connected to the support rod (523).

10. A thermal desorption kiln tail gas waste heat recycling device according to claim 9, characterized in that: A driving mechanism is arranged at one side inside the exchange chamber (200), the driving mechanism comprising a second gear (601), the second gear (601) being provided with a power device (602) via a transmission shaft, the power device (602) being installed at the bottom of the exchange chamber (200), one side of the second gear (601) being meshedly connected with a second gear ring (600), the second gear ring (600) being fixedly installed on the outside of the support ring (300).

Images