Intelligent temperature control and heat recovery device

Abstract

The application discloses an intelligent temperature control and heat energy recovery device, which comprises a tunnel furnace and a heat exchange mechanism, and a plurality of heat exchange pipes are arranged in the heat exchange mechanism; the heat exchange mechanism is provided with a hot medium outlet pipe for outputting the medium after temperature rising; the device further comprises an SMA heat hysteresis three-way distribution valve, which is connected in a pipeline manner downstream of the hot medium outlet pipe; the SMA heat hysteresis three-way distribution valve comprises a valve body, a valve core movably connected to the inside of the valve body, and an SMA spiral spring and a reset spring for driving the valve core to move and reset; the austenite phase change end temperature of the SMA spiral spring is higher than the martensite phase change start temperature; by setting the Af temperature of the SMA spiral spring to be higher than the Ms temperature, a 15-30 DEG C discrimination window is formed by using the inherent heat hysteresis characteristic of the SMA material; when the temperature rises to the Af temperature, the valve core is fully opened to store the heat outlet; when the temperature falls to the Ms temperature, the valve core is closed to store the heat outlet; and the time mismatch problem between the heat recovery peak value and the heat demand peak value is solved.

Description

Technical Field

[0001] This invention relates to the field of heat recovery technology, specifically to an intelligent temperature control and heat recovery device. Background Technology

[0002] In continuous production lines for pastry baking, tunnel ovens continuously generate high-temperature flue gas containing a large amount of recoverable waste heat. The main function of commercially available waste heat recovery equipment is to collect the waste heat from the flue gas and resupply it to the baking process, thereby reducing the consumption of fuels such as natural gas, reducing production energy consumption, and lowering the exhaust temperature to meet the factory's energy conservation and environmental emission requirements. During production, there are two typical operating conditions: continuous constant-temperature production and product changeover restart. During the product changeover stage, an additional high-power heat source is needed to preheat the low-temperature blanks. During continuous production, the furnace heat load is excessive, and there are high requirements for the regulation and matching of waste heat supply.

[0003] However, existing tunnel baking ovens experience significant fluctuations in heat consumption during baking production. Consequently, the peak heat recovery period (late stage of constant temperature) and the peak heat demand period (early stage of feeding) are out of sync. During the constant temperature baking stage, the flue gas has abundant residual heat, but the furnace does not require a large amount of additional heating. The excess heat cannot be fully utilized, resulting in wasted energy. During the production changeover stage, such as when changing the type of baked goods or restarting after a batch shutdown, the overall temperature of the furnace body and the new billet is low, and a high-power heat source is urgently needed for preheating. However, at this time, the exhaust gas temperature is low and the residual heat supply is insufficient, so a large amount of fuel must be consumed to maintain the furnace temperature, resulting in extremely low overall energy utilization efficiency.

[0004] To address this, an intelligent temperature control and heat recovery device is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an intelligent temperature control and heat recovery device to solve the problem mentioned in the background art, which is that during the production change stage after changing the type of baked goods or restarting after a batch shutdown, the overall temperature of the furnace body and the new billet is too low, and a high-power heat source is urgently needed to preheat and raise the temperature. However, at this time, the exhaust gas temperature is low and the waste heat supply is insufficient, so a large amount of fuel can be consumed to maintain the furnace temperature, resulting in extremely low overall energy utilization efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an intelligent temperature control and heat recovery device, comprising a tunnel furnace and a heat exchange mechanism, wherein a plurality of heat exchange tubes are arranged inside the heat exchange mechanism, and the heat exchange mechanism is provided with a heat medium outlet pipe for outputting the heated medium, and further comprising,

[0007] The SMA thermal hysteresis three-way distribution valve is connected downstream of the heat medium outlet pipe. The SMA thermal hysteresis three-way distribution valve includes a valve body, and a valve core is movably connected inside the valve body. The valve body drives the valve core to move and return through an SMA helical spring and a return spring. The austenitic phase transformation end temperature of the SMA helical spring is higher than its martensitic phase transformation start temperature. The valve body is provided with a heat storage outlet and a bypass outlet.

[0008] A phase change heat storage chamber is connected to the heat storage outlet of the SMA thermal hysteresis three-way distribution valve. The phase change heat storage chamber is provided with a phase change material filling area and a heat storage and heat exchange tube bundle immersed in it.

[0009] The heat exchanger and the phase change heat storage chamber are connected by upper and lower pipes arranged at different heights to form a pump-free thermosiphon circulation loop, and the phase change heat storage chamber is installed at a lower height than the heat exchanger.

[0010] Preferred options also include,

[0011] A flue gas drive assembly is disposed at the flue gas inlet, including a turbine housing and turbine blades rotatably connected within the turbine housing, wherein the turbine blades are fixedly connected to a central drive shaft via a turbine hub, and the central drive shaft extends along the axial direction of the flue gas inlet.

[0012] The reciprocating scraper, in multiple sets, is movably connected inside the heat exchange tube. The reciprocating scraper is connected to the central drive shaft via a scraper base rod and a transmission assembly. The reciprocating scraper is also movably connected to the turbine blades via the transmission assembly.

[0013] Preferably, the heat exchange mechanism is provided with a conical dust collection hopper at the bottom, the bottom of the conical dust collection hopper is provided with a drain port and a flange blind plate, and the outer edge of the reciprocating scraper is provided with a micro-toothed cutting edge.

[0014] Preferably, the heat exchanger further includes a heat exchanger inlet end fixedly connected to the front end of the tunnel furnace, a set of heat exchange medium inlet pipes and heat exchange medium outlet pipes are respectively connected to both ends of the phase change heat storage chamber, and a heat exchange box is fixedly connected to the bottom of the heat exchanger inlet end, with heat exchange fins respectively provided on both sides of the heat exchange box.

[0015] Preferably, it also includes a gas replenishment mechanism, which is set at the bottom of the heat exchanger. The gas replenishment mechanism includes two air inlet plates, and a heater box is fixedly connected to the bottom of each of the two air inlet plates. Two valve plates are slidably connected to the interior of the two heater boxes and the heat exchange box. Two electrically controlled rotating rings are fixedly connected to the interior of the heat exchange box. Both of the electrically controlled rotating rings are hinged to the valve plates through connecting rods.

[0016] Preferably, both ends of the valve body are fixedly connected to sensing rings, and the electronically controlled rotating ring and the sensing rings are electrically connected, so that the valve core sends a command to the electronically controlled rotating ring after contacting the sensing ring.

[0017] Preferably, the valve core of the SMA thermal hysteresis three-way distribution valve opens and closes the heat storage outlet and the bypass outlet within the range of austenitic phase transformation temperature and martensitic phase transformation temperature, and the temperature difference between the end temperature of the austenitic phase transformation and the start temperature of the martensitic phase transformation is 15-30℃.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention sets the Af temperature of the SMA helical spring to be higher than the Ms temperature, and utilizes the inherent thermal hysteresis characteristics of SMA material to form a discrimination window of 15~30℃. When the temperature rises to Af, the valve core fully opens the heat storage outlet, and when the temperature drops to Ms, the valve core closes the heat storage outlet. This allows high-temperature heat to selectively enter the heat storage chamber and low-temperature medium to automatically bypass, thus solving the problem of time mismatch between the peak heat recovery and the peak heat demand.

[0020] This invention utilizes the physical principle that the phase change heat storage chamber is installed at a low position and the heat release heat exchanger is installed at a high position, forming a pump-free thermosiphon circulation loop by using the physical principle that the density of the heat medium decreases when heated and rises naturally, and the density increases after heat release and flows back naturally. It can achieve stable unidirectional heat transfer without any external power. Combined with the storage and condensation release of the latent heat of vaporization of the phase change working fluid, the system energy consumption is reduced.

[0021] This invention enables the system to automatically adjust the gas replenishment strategy according to the tunnel furnace operating conditions through the sensor-linked linkage between the gas replenishment mechanism valve plate and the SMA valve core. During continuous production, the valve plate fully opens the gas replenishment air duct to stabilize pressure and prevent overheating. When restarting production, the valve plate closes the air duct to concentrate heat and quickly preheat the billet. This achieves automatic matching between gas replenishment and heat supply, shortens the preheating time for production changes, and reduces additional fuel consumption. Attached Figure Description

[0022] Figure 1 This is an overall structural view of the present invention;

[0023] Figure 2 This is an overall exploded view of the invention;

[0024] Figure 3 This is a perspective view of the reciprocating scraper of the present invention;

[0025] Figure 4 This is a perspective view of the flue gas driving assembly of the present invention;

[0026] Figure 5 This is a perspective view of the heat exchanger of the present invention;

[0027] Figure 6This is a cross-sectional view of the SMA thermal hysteresis three-way distribution valve of the present invention.

[0028] Figure 7 This is a perspective view of the phase change heat storage cavity of the present invention;

[0029] Figure 8 This is a perspective view of the air replenishment mechanism of the present invention;

[0030] Figure 9 This is a schematic diagram of the sliding adjustment of the valve plate of the air replenishment mechanism of the present invention.

[0031] In the picture:

[0032] 1. Heat exchange mechanism; 101. Flue gas inlet; 102. Heat exchanger shell; 103. Flue gas outlet; 104. Heat medium outlet pipe; 105. Heat medium inlet pipe;

[0033] 2. Flue gas drive assembly; 201. Turbine housing; 202. Turbine blades; 203. Turbine hub; 204. Central drive shaft; 205. Graphite packing shaft seal;

[0034] 3. Heat exchange tube; 301. Reciprocating scraper; 302. Scraper base rod; 303. Transmission assembly; 304. Micro-toothed cutting edge;

[0035] 4. Conical dust collection hopper; 401. Sewage outlet; 402. Flange blind plate;

[0036] 5. SMA thermal hysteresis three-way distribution valve; 501. Valve body; 502. Heat storage outlet; 503. Valve core; 504. Bypass outlet; 505. SMA helical spring; 506. Return spring; 507. Heat medium inlet; 508. Sensing ring;

[0037] 6. Phase change heat storage chamber; 601. Phase change material filling area; 602. Heat storage and heat exchange tube bundle; 603. Heat storage chamber inlet; 604. Heat storage chamber outlet;

[0038] 7. Air supply mechanism; 701. Air inlet plate; 703. Heater box; 704. Valve plate; 705. Electrically controlled rotating ring; 706. Connecting rod;

[0039] 8. Heat exchanger; 801. Heat exchanger inlet; 802. Heat exchange medium inlet pipe; 803. Heat exchange medium outlet pipe; 804. Heat exchange box; 805. Heat exchange fins;

[0040] 9. Tunnel furnace. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Please see Figures 1 to 9 This invention provides a technical solution for an intelligent temperature control and heat recovery device:

[0043] An intelligent temperature control and heat recovery device includes a tunnel furnace 9 and a heat exchange mechanism 1. The heat exchange mechanism 1 has several heat exchange tubes 3 arranged inside it. The heat exchange mechanism 1 also has a heat medium outlet pipe 104 for discharging the heated medium. The device further includes…

[0044] The SMA thermal hysteresis three-way distribution valve 5 is connected downstream of the heat medium outlet pipe 104. The SMA thermal hysteresis three-way distribution valve 5 includes a valve body 501, and a valve core 503 is movably connected inside the valve body 501. The valve body 501 drives the valve core 503 to move and return through an SMA helical spring 505 and a return spring 506. The austenitic phase transformation end temperature of the SMA helical spring 505 is higher than its martensitic phase transformation start temperature. The valve body 501 has a heat storage outlet 502 and a bypass outlet 504 respectively. The valve core 503 of the SMA thermal hysteresis three-way distribution valve 5 opens and closes the heat storage outlet 502 and the bypass outlet 504 within the range between the austenitic phase transformation temperature and the martensitic phase transformation temperature. The temperature difference between the austenitic phase transformation end temperature and the martensitic phase transformation start temperature is 15-30℃.

[0045] During operation, high-temperature flue gas flows along the outer wall of heat exchange tube 3, transferring heat energy through the tube wall to the hot medium flowing inside the heat exchange tube 3. The hot medium enters through the hot medium inlet pipe 105, is heated, and then flows out through the hot medium outlet pipe 104. The high-temperature hot medium flows into the valve body 501 of the SMA thermal hysteresis three-way distribution valve 5 through the hot medium inlet 507. The SMA helical spring 505 is directly immersed in the hot medium and extends or contracts according to the temperature change of the hot medium, driving the valve core 503 to move.

[0046] When the temperature of the heat medium is lower than the martensitic phase transformation start temperature of the SMA helical spring 505, the SMA helical spring 505 is in a contracted state, the return spring 506 pushes the valve core 503 to close the heat storage outlet 502, and all the heat medium is discharged through the bypass outlet 504.

[0047] When the temperature of the heat medium is in the hysteresis range between the start temperature of the martensitic phase transformation and the end temperature of the austenitic phase transformation, the SMA helical spring 505 remains in a partially extended state, the valve core 503 partially opens the heat storage outlet 502, and the heat medium partially enters the heat storage chamber and partially bypasses.

[0048] When the temperature of the heat medium is higher than the end temperature of the austenitic phase transformation, the SMA helical spring 505 is fully extended, overcoming the resistance of the return spring 506 and pushing the valve core 503 to fully open the heat storage outlet 502, so that all the heat medium enters the phase transformation heat storage chamber 6.

[0049] In this embodiment, the austenitic phase transformation end temperature of the SMA helical spring 505 is configured to be higher than its martensitic phase transformation start temperature, with a temperature difference of 15-30°C. This temperature difference forms a hysteresis range. During the heating process, the heat medium needs to be heated to the austenitic phase transformation end temperature before the valve can open the heat storage channel; during the cooling process, the heat medium needs to be cooled to the martensitic phase transformation start temperature before the valve can close the heat storage channel.

[0050] As one embodiment of the present invention, such as Figures 1 to 4 As shown, it also includes,

[0051] The flue gas drive assembly 2 is disposed at the flue gas inlet 101 and includes a turbine housing 201 and a turbine blade 202 rotatably connected in the turbine housing 201. The turbine blade 202 is fixedly connected to the central drive shaft 204 through the turbine hub 203. The central drive shaft 204 extends along the axial direction of the flue gas inlet 101.

[0052] A reciprocating scraper 301, multiple sets of reciprocating scrapers 301 are movably connected inside the heat exchange tube 3. The reciprocating scraper 301 is connected to the central drive shaft 204 through the scraper bottom rod 302 and the transmission group 303. The reciprocating scraper 301 is movably connected to the turbine blade 202 through the transmission group 303. A conical dust collection hopper 4 is provided at the bottom of the heat exchange mechanism 1. A drain port 401 and a flange blind plate 402 are provided at the bottom of the conical dust collection hopper 4. The outer edge of the reciprocating scraper 301 is provided with a micro-toothed cutting edge 304.

[0053] During operation, the high-temperature flue gas discharged from the tunnel furnace 9 enters the heat exchanger shell 102 through the flue gas inlet 101, and is discharged from the flue gas outlet 103 after heat exchange. The kinetic energy of the flue gas impacts the turbine blades 202, thereby driving the turbine hub 203 to rotate. The turbine hub 203 drives the central drive shaft 204 to rotate. The central drive shaft 204 drives the scraper bottom rod 302 to move synchronously through the transmission group 303. The reciprocating scraper 301 on the heat exchange tube 3 moves accordingly. Its micro-toothed cutting edge 304 continuously scrapes off the oil and dirt deposited on the inner wall of the heat exchange tube 3. The scraped dirt falls into the conical dust collection hopper 4 under the action of gravity and is periodically discharged through the drain port 401. A graphite packing shaft seal 205 is provided on the outside of the central drive shaft 204.

[0054] As one embodiment of the present invention, such as Figures 5 to 8 As shown, the phase change heat storage chamber 6 is connected to the heat storage outlet 502 of the SMA thermal hysteresis three-way distribution valve 5. The phase change heat storage chamber 6 is provided with a phase change material filling area 601 and a heat storage and heat exchange tube bundle 602 immersed in it.

[0055] The heat exchanger 8 and the phase change heat storage chamber 6 are connected by upper and lower pipes arranged at different heights to form a pump-free thermosiphon circulation loop. The phase change heat storage chamber 6 is installed at a lower height than the heat exchanger 8. The heat exchanger 8 also includes a heat exchanger inlet end 801 fixedly connected to the front end of the tunnel furnace 9. The two ends of the phase change heat storage chamber 6 are respectively connected to a set of heat release medium inlet pipe 802 and heat release medium outlet pipe 803. The bottom of the heat exchanger inlet end 801 is fixedly connected to a heat release box 804. Heat release fins 805 are respectively provided on both sides of the heat release box 804.

[0056] During operation, when the heat storage outlet 502 of the SMA thermal hysteresis three-way distribution valve 5 is opened, the high-temperature heat medium enters the phase change heat storage chamber 6 through the heat storage chamber inlet 603. It first enters the heat storage and heat exchange tube bundle 602. The heat medium flows through the inside of the tube bundle and conducts heat to the phase change material in the phase change material filling area 601 through the tube wall (the phase change material is a functional working fluid that uses the reversible change of state between liquid and gas to realize heat storage and release, such as pure water, low carbon alcohol, low boiling point organic heat exchange medium, etc.). After absorbing heat, the phase change material vaporizes from liquid to gas and stores the heat in the form of latent heat of vaporization.

[0057] The phase change heat storage chamber 6 is installed at the lower position of the tunnel furnace 9, and the heat exchanger 8 is installed at the higher position of the tunnel furnace 9. When the phase change material releases heat, it heats the heat medium in the heat storage chamber, causing its temperature to rise and its density to decrease. The less dense heat medium naturally rises and flows to the heat exchanger 8, where it releases heat in the heat box 804 and the heat fins 805 to heat the heat-using medium (which can be used to heat the newly entered air inside the tunnel furnace 9 to optimize the efficiency of the tunnel furnace 9). After the heat is released, the temperature of the heat medium decreases and its density increases. Under the action of gravity, it flows out from the heat outlet pipes 803 at both ends of the heat box 804 and returns to the phase change heat storage chamber 6, where it is heated again and rises, forming a pump-free natural circulation. Furthermore, the heat inlet pipe 802 is equipped with a gravity reset check valve to prevent backflow of the medium when the machine stops.

[0058] As one embodiment of the present invention, such as Figures 1 to 2 and Figures 5 to 9As shown, it also includes a gas replenishment mechanism 7, which is located at the bottom of the heat exchanger 8. The gas replenishment mechanism 7 includes two air inlet plates 701. The bottom of each air inlet plate 701 is fixedly connected to a heater box 703. The two heater boxes 703 and the interior of the heat exchanger 804 are slidably connected to two valve plates 704. The interior of the heat exchanger 804 is fixedly connected to two electrically controlled rotating rings 705. The two electrically controlled rotating rings 705 are hinged to the valve plates 704 through connecting rods 706. Both ends of the valve body 501 are also fixedly connected to sensing rings 508. The electrically controlled rotating rings 705 and sensing rings 508 are electrically connected so that the valve core 503 sends a command to the electrically controlled rotating rings 705 after contacting the sensing rings 508.

[0059] During operation, the sensing rings 508 at both ends of the valve body 501 are electrically connected to the internal electrically controlled rotating ring 705 of the air replenishment mechanism 7. An adjustment signal is only output when the valve core 503 reaches the left and right limit positions of the valve body 501 and is in contact with the sensing rings 508.

[0060] The current situation is during continuous production;

[0061] When the tunnel furnace 9 is in a continuous constant-temperature baking state, the flue gas temperature remains stable in a high range, and the temperature of the heat medium continues to be higher than the austenite phase transformation end temperature (Af). The SMA helical spring 505 is in a fully extended state, and the valve core 503 is pushed to the left limit position of the valve body 501, adhering to the left sensing ring 508. After the left sensing ring 508 is triggered, it outputs a positive rotation signal to the electric control rotating ring 705. After receiving the signal, the electric control rotating ring 705 rotates in the forward direction, pulling the valve plates 704 on both sides to slide synchronously through the connecting rod 706. This causes the valve plates 704 to open the air duct of the air inlet plate 701 inside the heater box 703. At this time, the furnace air supply flow area is maximized, the air supply volume is increased, and a large amount of fresh air passes through the heater box 703. After being heated, the medium enters the furnace to stabilize the internal pressure. Under this condition, the flow rate of the medium in the heat exchanger 8 is relatively reduced because the furnace itself has sufficient heat load during continuous production and does not require a large amount of additional heat. The phase change heat storage chamber 6 mainly serves to store waste heat. When the vapor pressure of the medium inside the circulation pipeline increases, for the change heat storage medium from liquid to gas phase, the saturated vapor pressure is proportional to the vaporization temperature. The pressure increase inside the pipe will simultaneously increase the saturated vaporization temperature of the phase change material, so that the pressure buildup in the pipeline will not cause the medium to continuously vaporize at an overheated temperature. After the pressure increases, the vaporization threshold of the phase change material rises simultaneously, and the vaporization rate automatically slows down. The gas and liquid phases inside the chamber maintain dynamic equilibrium and achieve self-pressure stabilization by relying on the saturated temperature and pressure characteristics of the working medium itself.

[0062] When restarting production after a change in manufacturing;

[0063] When changing baking products or restarting after a batch shutdown, the overall temperature of the oven body and new raw materials is low, requiring a high-power heat source for rapid preheating. At this time, the exhaust gas temperature is low, and the temperature of the heat medium is below the martensitic phase transformation start temperature (Ms). The SMA helical spring 505 is in a contracted state, and the return spring 506 pushes the valve core 503 to the right limit position of the valve body 501, which is in contact with the right sensing ring 508. After the right sensing ring 508 is triggered, it outputs a reverse rotation signal to the electronic control rotating ring 705. After receiving the signal, the electronic control rotating ring 705 rotates in the opposite direction, and pushes the valve plates 704 on both sides to slide synchronously through the connecting rod 706, so that the valve plates 704 cover the air duct at the bottom of the air inlet plate 701. At this time, the air supply is activated. The flow is closed, and no cold air is introduced to prevent a large amount of cold air from entering the furnace and causing a further drop in furnace temperature. The high-temperature heat stored in the phase change heat storage chamber 6 is transported to the heat exchanger 8 at full flow through the heat release medium inlet pipe 802. It is concentrated and released in the heat release box 804 and heat release fins 805 to fully preheat the fresh air entering the furnace from the side. The preheated high-temperature air is then sent into the tunnel furnace 9 to quickly preheat and raise the temperature of a large batch of low-temperature billets, shorten the preheating time for production changeover, and reduce additional fuel consumption. Furthermore, a baffle is provided between the tunnel furnace 9 and the gas replenishment mechanism 7 to prevent the high-temperature gas inside the tunnel furnace 9 from overflowing to the outlet. The bottom of the baffle is provided with a passage groove to facilitate the passage of baked goods.

[0064] Working principle: During operation, the high-temperature flue gas discharged from the tunnel furnace 9 enters the heat exchanger shell 102 through the flue gas inlet 101, and is discharged from the flue gas outlet 103 after heat exchange. The kinetic energy of the flue gas impacts the turbine blades 202, driving the turbine hub 203 to rotate. The turbine hub 203 drives the central drive shaft 204 to rotate. The central drive shaft 204 drives the scraper bottom rod 302 to move synchronously through the transmission group 303. The reciprocating scraper 301 on the heat exchange tube 3 moves accordingly. Its micro-toothed cutting edge 304 continuously scrapes away the dirt deposited on the inner wall of the heat exchange tube 3. The scraped dirt falls into the conical dust collection hopper 4 under the action of gravity and is periodically discharged through the drain port 401.

[0065] At the same time, high-temperature flue gas flows along the outer wall of heat exchange tube 3, and the heat energy is transferred through the tube wall to the heat medium (heat transfer oil or water) flowing in the inner cavity of heat exchange tube 3. The heat medium enters from the heat medium inlet pipe 105, is heated and flows out from the heat medium outlet pipe 104, and flows into the SMA thermal hysteresis three-way distribution valve 5 through the heat medium inlet 507. The SMA spiral spring 505 is directly immersed in the heat medium flowing through the valve body 501, and it extends or contracts according to the change of the heat medium temperature, driving the valve core 503 to move.

[0066] When the temperature of the heat medium is lower than the martensitic phase transformation start temperature (Ms) of the SMA helical spring 505, the SMA helical spring 505 is in a contracted state, and the return spring 506 pushes the valve core 503 to close the heat storage outlet 502. All the heat medium is discharged or returned through the bypass outlet 504 to prevent the low temperature medium from entering the heat storage chamber and diluting the stored heat.

[0067] When the temperature of the heat medium is in the hysteresis range (Ms-Af) between the martensitic phase transformation start temperature and the austenitic phase transformation end temperature, the SMA helical spring 505 remains in a partially extended state, the valve core 503 partially opens the heat storage outlet 502, part of the heat medium enters the phase transformation heat storage chamber 6, and part of it goes through the bypass outlet 504.

[0068] When the temperature of the heat medium is higher than the end temperature of the austenitic phase transformation (Af), the SMA helical spring 505 is fully extended, overcoming the resistance of the return spring 506 to push the valve core 503 to fully open the heat storage outlet 502, and all the heat medium enters the phase transformation heat storage chamber 6.

[0069] The high-temperature heat medium entering the phase change heat storage chamber 6 flows into the heat storage and heat exchange tube bundle 602 through the heat storage chamber inlet 603. Heat is transferred through the tube walls to the phase change material in the phase change material filling area 601. After absorbing heat, the phase change material vaporizes from a liquid state to a gaseous state, storing the heat as latent heat of vaporization. The phase change heat storage chamber 6 is installed at the lower position of the tunnel furnace 9, and the heat release heat exchanger 8 is installed at the higher position of the tunnel furnace 9. The two form a pump-free thermosiphon circulation loop through upper and lower pipelines. When heat is needed, the phase change material releases heat (condensing from a gaseous state to a liquid state), heating the heat medium in the heat storage chamber and raising its temperature. As the density decreases, the less dense heat medium naturally rises and flows through the heat release medium inlet pipe 802 to the heat release heat exchanger 8. It releases heat in the heat release box 804 and heat release fins 805, heating the newly entered air (using the hot end medium) inside the tunnel furnace 9. After releasing heat, the temperature of the heat medium decreases and its density increases. Under the action of gravity, it flows out from the heat release medium outlet pipes 803 at both ends of the heat release box 804 and returns to the phase change heat storage chamber 6 to be heated and rise again, forming a pump-free natural circulation. The heat release medium inlet pipe 802 is equipped with a gravity reset check valve, which automatically closes when the machine stops to prevent backflow of the medium.

[0070] The central transmission shaft 204 of the device of the present invention is made of 310S high-temperature resistant stainless steel. The SMA coil spring 505 is made of NiTi-based shape memory alloy, and the hysteresis interval between its austenite transformation finish temperature and martensite transformation start temperature is regulated by the alloy composition ratio and heat treatment process. The present application utilizes the physical property of SMA material that "the temperature required for complete elongation upon heating (Af)" is higher than "the temperature at which retraction starts upon cooling (Ms)", and takes the 15-30°C temperature difference between the two as the "heat source quality discrimination window". When the temperature rises, if the temperature is not high enough (<Af), entry into the heat storage cavity is not allowed; when the temperature drops, if the temperature is still high enough (>Ms), the open state is maintained to continue charging heat. The turbine blade 202 is made of 310S high-temperature resistant stainless steel. All the above materials are conventional selections well known to those skilled in the art, and will not be elaborated herein.

[0071] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent temperature control and heat recovery device, comprising a tunnel furnace (9) and a heat exchange mechanism (1), wherein a plurality of heat exchange tubes (3) are arranged inside the heat exchange mechanism (1), and the heat exchange mechanism (1) is provided with a heat medium outlet pipe (104) for discharging the heated medium, characterized in that: It also includes, SMA thermal hysteresis three-way distribution valve (5), the SMA thermal hysteresis three-way distribution valve (5) is connected to the downstream of the heat medium outlet pipe (104), the SMA thermal hysteresis three-way distribution valve (5) includes a valve body (501), the valve body (501) is internally connected to a valve core (503), and the valve body (501) drives the valve core (503) to move and reset through an SMA helical spring (505) and a return spring (506). The austenitic phase transformation end temperature of the SMA helical spring (505) is higher than its martensitic phase transformation start temperature. The valve body (501) is provided with a heat storage outlet (502) and a bypass outlet (504). Phase change heat storage chamber (6), the phase change heat storage chamber (6) is connected to the heat storage outlet (502) of the SMA thermal hysteresis three-way distribution valve (5), and the phase change heat storage chamber (6) is provided with a phase change material filling area (601) and a heat storage and heat exchange tube bundle (602) immersed in it. The heat exchanger (8) and the phase change heat storage chamber (6) are connected by upper and lower pipes arranged at different heights to form a pump-free thermosiphon circulation loop, and the phase change heat storage chamber (6) is installed at a lower height than the heat exchanger (8).

2. The intelligent temperature control and heat recovery device according to claim 1, characterized in that: It also includes, The flue gas drive assembly (2) is located at the flue gas inlet (101) and includes a turbine housing (201) and turbine blades (202) rotatably connected in the turbine housing (201). The turbine blades (202) are fixedly connected to the central drive shaft (204) through the turbine hub (203). The central drive shaft (204) extends along the axial direction of the flue gas inlet (101). Reciprocating scraper (301), multiple sets of reciprocating scraper (301) are movably connected inside the heat exchange tube (3). The reciprocating scraper (301) is connected to the central drive shaft (204) through the scraper bottom rod (302) and the transmission group (303). The reciprocating scraper (301) is movably connected to the turbine blade (202) through the transmission group (303).

3. The intelligent temperature control and heat recovery device according to claim 2, characterized in that: The heat exchange mechanism (1) is provided with a conical dust collection hopper (4) at the bottom. The conical dust collection hopper (4) is provided with a drain port (401) and a flange blind plate (402) at the bottom. The reciprocating scraper (301) is provided with a micro-toothed blade edge (304) on its outer edge.

4. The intelligent temperature control and heat recovery device according to claim 1, characterized in that: The heat exchanger (8) also includes a heat exchanger inlet end (801) fixedly connected to the front end of the tunnel furnace (9). The two ends of the phase change heat storage chamber (6) are respectively connected to a heat exchange medium inlet pipe (802) and a heat exchange medium outlet pipe (803). The bottom of the heat exchanger inlet end (801) is fixedly connected to a heat exchange box (804). Heat exchange fins (805) are respectively provided on both sides of the heat exchange box (804).

5. The intelligent temperature control and heat recovery device according to claim 4, characterized in that: It also includes a gas replenishment mechanism (7), which is set at the bottom of the heat exchanger (8). The gas replenishment mechanism (7) includes two air inlet plates (701). The bottom of each of the two air inlet plates (701) is fixedly connected to a heater box (703). The two heater boxes (703) and the heat exchange box (804) are slidably connected to two valve plates (704). The heat exchange box (804) is fixedly connected to two electrically controlled rotating rings (705). The two electrically controlled rotating rings (705) are hinged to the valve plates (704) by a connecting rod (706).

6. The intelligent temperature control and heat recovery device according to claim 5, characterized in that: Both ends of the valve body (501) are fixedly connected to sensing rings (508), and the electronically controlled rotating ring (705) and the sensing ring (508) are electrically connected so that the valve core (503) sends a command to the electronically controlled rotating ring (705) after contacting the sensing ring (508).

7. The intelligent temperature control and heat recovery device according to claim 1, characterized in that: The valve core (503) of the SMA thermal hysteresis three-way distribution valve (5) opens and closes the heat storage outlet (502) and the bypass outlet (504) within the range of austenitic phase transformation temperature and martensitic phase transformation temperature. The temperature difference between the end temperature of austenitic phase transformation and the start temperature of martensitic phase transformation is 15-30℃.

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