Coking device based on phase change heat transfer

Abstract

The invention discloses a coking device based on phase change heat transfer, and belongs to the technical field of coke oven coking. The coking device comprises a plurality of heat pipe units, wherein an evaporator and a condenser are connected through a heat pipe pipeline to form a closed circulation loop; the heating unit comprises a second shell, the second shell is filled with a microwave absorbing material and provided with a plurality of microwave emitting plates used for heating the microwave absorbing material, and evaporators in the heat pipe unit are all installed in the second shell; the coking unit comprises a plurality of carbonization chambers distributed at intervals, the carbonization chambers are located above the heating unit, a first phase change heat storage material is arranged in a gap between every two adjacent carbonization chambers, and the condensers in the heat pipe unit are installed in the first phase change heat storage materials. According to the scheme, a heat transfer path between microwave heating and the carbonization chamber is designed, so that the microwave heating is favorably applied to coking of the industrial coke oven, the hot start time is shortened, the energy utilization efficiency is improved, and in addition, the heating uniformity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coke-making in coke ovens, and more specifically, to a coke-making device based on phase change heat transfer. Background Art

[0002] The main heating methods of existing industrial coke ovens are as follows: Gas burns in the combustion chamber to generate high-temperature gas, and then through a complex gas distribution and switching system to achieve the heating of the coke oven. This way of directly heating with gas, on the one hand, will result in relatively low energy utilization rate; on the other hand, it takes a lot of time for the cold start and temperature rise operation of the carbonization chamber, that is, the heat storage cycle required for the carbonization chamber is relatively long, resulting in low production efficiency of the coke oven. In addition, under this heating method, the heating uniformity of the carbonization chamber is poor, and the temperature control accuracy is insufficient, which further leads to large fluctuations in the quality of the produced coke, restricting its subsequent application in industrial fields such as iron and steel smelting.

[0003] How to shorten the hot start time of the coke oven and further improve the heating uniformity has always been one of the important research topics in the metallurgical field. One direction is to directly heat the coal cake by microwave. For example, the Chinese patent application case with the application number 2023112917415 discloses a kilogram-level coke-making coal microwave heating device and method for making coke, specifically including a microwave heating furnace, a carrying device arranged in the microwave heating furnace, and a storage box placed on the carrying device, and the storage box is used to hold kilogram-level single-type coke-making coal; a cathode block and an anode block sleeved outside the cathode block are installed in the microwave heating furnace, and a DC high voltage of 2000V - 2200V is applied between the cathode block and the anode block; a microwave emitter is installed at the bottom of the microwave heating furnace; a microwave energy output device is installed near the anode block, and the microwave energy output device obtains the electric field energy between the cathode block and the anode block and converts the electric field energy into microwave energy and transports it to the microwave emitter, and the microwave emitter conducts microwave heating on the inside of the microwave heating furnace. This application case integrates microwave heating and high-temperature coke-making, uses a DC electric field to continuously strengthen the microwave energy, and heats the coke-making coal in the form of microwave to make coke. However, this application case is only applicable to the heating of kilogram-level coke-making coal in the laboratory, and the method of directly heating coal by microwave cannot be adapted to the production of industrial coke ovens.

[0004] Another example is the Chinese patent application case with the application number 2017105424193, which discloses a 60kg microwave coke-making test furnace and its coke-making method. This application case directly heats the coking coal by microwave, enabling the coking coal to quickly rise in temperature, shortening the coking time. At the same time, it heats the coking coal from the inside and outside at the same time, resulting in good uniformity of the formed coke product, high microwave heating efficiency, low required microwave power, and fast temperature rise of the coking coal. However, microwave heating of coal still remains at the stage of test coke ovens and cannot be adapted to the production of industrial coke ovens.

[0005] As can be seen from the above, the existing heating method of microwave heating coal cannot be directly applied to industrial coke oven coking. Summary of the Invention

[0006] Aiming at the technical problem that the existing microwave heating method cannot be directly applied to industrial coke oven coking, the present invention provides a coking device based on phase change heat transfer. This solution optimizes the heat transfer path between microwave heating and the carbonization chamber, which is beneficial to applying microwave heating to industrial coke oven coking, reduces the hot start time, and has high microwave heating efficiency. Thus, it not only improves the energy utilization efficiency but also improves the uniformity of coal heating.

[0007] To achieve the above object, the technical solution provided by the present invention is as follows: The present invention provides a coking device based on phase change heat transfer, including: a plurality of heat pipe units, each of the plurality of heat pipe units includes an evaporator and a condenser, wherein the evaporator and the condenser are connected by a heat pipe pipeline to form a closed circulation loop, and a heat transfer working medium circulates in the closed circulation loop; a heating unit, the heating unit includes a second housing, the inside of the second housing is filled with a microwave absorbing material and is provided with a plurality of microwave emitting plates for heating the microwave absorbing material, and the evaporators in the heat pipe units are all installed inside the second housing, and heat is provided to the evaporators through the microwave absorbing material; and a coking unit, the coking unit includes a plurality of carbonization chambers distributed at intervals, the carbonization chambers are located above the heating unit, and a first phase change heat storage material is provided in the gap between adjacent carbonization chambers, and the condensers in the heat pipe units are all installed inside the first phase change heat storage material, and heat is provided to the first phase change heat storage material through the condensers.

[0008] Further, a check valve is also provided inside the heat pipe pipeline, and the check valve is located in the heat pipe pipeline between the outlet end of the evaporator and the inlet end of the condenser, and is used to limit the reflux of the heat transfer working medium from the inlet end of the condenser to the outlet end of the evaporator.

[0009] Further, the check valve adopts a Tesla valve structure, which includes a main channel and a plurality of check branches connected to the main channel, and the plurality of check branches are arranged on one side or both sides of the main channel.

[0010] Further, a flow limiting component is also provided inside the end of the check valve close to the evaporator, and the flow limiting component includes a flow limiting branch connected to the main channel, the flow limiting branch and the check branch on the other side of the main channel are centrosymmetric figures, and are arranged staggeredly along the axis of the main channel.

[0011] Further, an adjusting baffle is also provided inside the main channel, and the adjusting baffle is used to control the opening degree of the main channel.

[0012] Further, one end of the rotating shaft of the adjusting baffle extends to the outside of the heat pipe pipeline, the adjusting transmission member and the adjusting driving member are located outside the heat pipe pipeline, and the adjusting driving member drives the adjusting baffle to rotate through the adjusting transmission member, thereby controlling the opening degree of the main channel.

[0013] Further, the adjusting driving member adopts a motor, and the adjusting transmission member adopts a gear set.

[0014] Further, multiple microwave emitting plates and multiple evaporators are staggered and distributed inside the second housing; the heat transfer working medium includes an alkali metal working medium and nanoparticles; the inside of the heat pipe pipeline is a capillary microgroove structure.

[0015] Further, a working medium regulating valve connected to the heat pipe pipeline is provided inside the heat pipe unit, which is used to evacuate the heat pipe pipeline or control the amount of the heat transfer working medium in the heat pipe unit.

[0016] Further, the inner wall of the second housing is filled with a second phase change heat storage material; a plurality of temperature sensors are arranged at intervals in the height direction inside the carbonization chamber.

[0017] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects: (1) By optimizing the design of the heat transfer path between the microwave heating and the carbonization chamber, specifically, heating the carbonization chamber by combining the microwave emitting plate, the microwave absorbing material and the heat pipe unit, compared with the existing gas injection heating, the time required for microwave heating is shorter and the heat conversion efficiency is higher. At the same time, compared with directly heating the first phase change heat storage material by the microwave emitting plate, the heat pipe unit can be added to achieve rapid heat transfer, and there is no need to set continuous phase change heat storage materials between the side walls of adjacent carbonization chambers and the microwave absorbing material. In addition, the evaporator and the condenser in the heat pipe unit are connected by a heat pipe pipeline, that is, the heat pipe unit is a split heat pipe structure, so that the arrangement of the evaporator and the condenser is more flexible.

[0018] (2) The present invention further optimizes the internal structure of the heat pipe unit. Specifically, a check valve is provided inside the heat pipe pipeline to limit the reflux of the heat transfer working medium from the inlet end of the condenser to the outlet end of the evaporator, that is, to prevent the gaseous heat transfer working medium from flowing back from the condenser to the evaporator, that is, to prevent heat from being transferred back from the first phase change heat storage material to the microwave absorbing material. Further, the working temperature of coke oven coking is relatively high. To maintain the long-term stable operation of the check valve in a high-temperature environment, the check valve is preferably a Tesla valve structure.

[0019] (3) The present invention further adds a current-limiting component to the heat pipe unit. Specifically, the current-limiting branch in the current-limiting component and the resistance branch on the other side of the main channel are centrosymmetric figures, and the flow directions of the current-limiting branch and the resistance branch are opposite at the intersection, resulting in a collision, thereby reducing the flow velocity inside the main channel. Further, an adjustment flap is added to control the opening degree of the main channel by rotating the adjustment flap, so as to achieve a better current-limiting effect. Description of the Drawings

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the outside of the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of a partial interior of the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the inside of the heating unit in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0023] Figure 4 It is a principle structural schematic diagram of the heat pipe unit in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0024] Figure 5 It is a structural schematic diagram of a partial resistance valve in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0025] Figure 6 It is a three-dimensional structural schematic diagram of a partial current-limiting component in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the outside of the heat dissipation unit in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0027] Figure 8 It is a three-dimensional structural schematic diagram of a partial interior of the heat dissipation unit in the coking device based on phase change heat transfer according to an embodiment of the present invention Figure 1 .

[0028] Figure 9 It is a three-dimensional structural schematic diagram of a partial interior of the heat dissipation unit in the coking device based on phase change heat transfer according to an embodiment of the present invention Figure 2 .

[0029] Figure 10 It is a structural schematic diagram of the inside of the heat pipe pipeline in the coking device based on phase change heat transfer according to an embodiment of the present invention.

[0030] Reference Numeral Description: 1. Coking unit; 101. Furnace wall; 102. Carbonization chamber; 103. Feed inlet; 104. Discharge outlet; 105. First phase change heat storage material; 106. First thermal insulation layer; 107. Temperature sensor; 2. Heat pipe unit; 201. Heat pipe pipeline; 202. Check valve; 221. Main channel; 222. Check bend; 223. Check wing-shaped obstacle; 203. Flow limiting component; 231. Adjusting flap; 232. Adjusting transmission part; 233. Adjusting driving part; 234. Flow limiting wing-shaped obstacle; 235. Flow limiting bend; 204. Evaporator; 205. Condenser; 206. Working medium regulating valve; 207. Heat transfer working medium; 3. Heating unit; 301. Second phase change heat storage material; 302. Microwave absorption material; 303. Microwave emission plate; 304. Second housing; 305. Heat dissipation unit; 351. Heat dissipation fins; 352. Heat dissipation fan; 353. Heat dissipation housing; 354. Gravity heat pipe; 4. Control unit. Detailed implementation manners

[0031] To further understand the content of the present invention, the present invention will be described in detail in combination with the drawings and embodiments.

[0032] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like cited in this specification are only for the convenience of clear narration and are not used to limit the scope that can be implemented. The change or adjustment of their relative relationships, without substantial change of the technical content, should also be regarded as the scope that the present invention can be implemented.

[0033] It should be noted that the explanations of the evaporator 204 and the condenser 205 in the heat pipe unit ② are as follows: Under normal conditions, the heat transfer working medium 207 absorbs heat in the evaporator 204 and changes from liquid to gas, and the heat transfer working medium 207 liquefies and changes back to liquid in the condenser 205 to release heat. In this state, in the circulation loop of the heat pipe unit 2, the inlet end of the liquid heat transfer working medium in the evaporator 204 is called the inlet end of the evaporator 204, and the outlet end of the gaseous heat transfer working medium in the evaporator 204 is called the outlet end of the evaporator 204. The outlet end of the evaporator 204 is connected to the inlet end of the condenser 205 through the heat pipe pipeline 201; the inlet end of the evaporator 204 is connected to the outlet end of the condenser 205 through the heat pipe pipeline 201 to form a closed circulation loop for the flow of the heat transfer working medium 207. Refer to Figure 4As shown, the heat transfer working fluid 207 flows in a clockwise direction in the circulation loop. Under certain operating conditions, different from the normal state, especially when the heating unit 3 pauses heating, the temperature of the evaporator 204 in the circulation loop may be lower than that of the condenser 205 at this time. At this time, the condenser 205 may transfer heat to the evaporator 204 in the reverse direction, that is, the heat transfer working fluid 207 flows in the reverse direction in the closed circulation loop. However, the proportion of this flow state is relatively small. At this time, the pipeline of the heat pipe unit 2 located inside the second housing 304 is still called the evaporator 204, and the pipeline of the heat pipe unit 2 located inside the first phase change heat storage material 105 is still called the condenser 205. The ports referred to at the inlet and outlet ends of the evaporator 204 and the condenser 205 are the same as those referred to in the normal state.

[0034] This embodiment provides a coking device based on phase change heat transfer. Refer to Figures 1-4 As shown, it includes a plurality of heat pipe units 2. Each of the plurality of heat pipe units 2 includes an evaporator 204 and a condenser 205. The evaporator 204 and the condenser 205 are connected by a heat pipe pipeline 201 to form a closed circulation loop, and a heat transfer working fluid 207 circulates in the closed circulation loop; a heating unit 3, the heating unit 3 includes a second housing 304, the inside of the second housing 304 is filled with a microwave absorbing material 302, and a plurality of microwave emitting plates 303 for heating the microwave absorbing material 302 are provided inside the second housing 304. The evaporators 204 in the heat pipe units 2 are all installed inside the second housing 304, and heat is provided to the evaporator 204 through the microwave absorbing material 302; a coking unit 1, the coking unit 1 includes a plurality of carbonization chambers 102 distributed at intervals. The carbonization chambers 102 are located above the heating unit 3, and a first phase change heat storage material 105 is provided in the gap between adjacent carbonization chambers 102. The condensers 205 in the heat pipe units 2 are all installed inside the first phase change heat storage material 105, and heat is provided to the first phase change heat storage material 105 through the condenser 205; and a control unit 4 for controlling the operation of the coking device.

[0035] Wherein, the gap between adjacent carbonization chambers 102, that is, the gap between the wall bricks in adjacent carbonization chambers 102, is filled with the first phase change heat storage material 105.

[0036] The present invention heats the carbonization chamber 102 by combining a microwave emission plate 303, a microwave absorbing material 302 and a heat pipe unit 2. Compared with the existing gas injection heating, the microwave heating time is shorter and the heat conversion efficiency is higher, and it is beneficial to improve the uniformity of heating the carbonization chamber 102. Electric energy is converted into microwaves by the microwave emission plate 303, and the microwave absorbing material 302 absorbs the microwaves and converts them into heat energy. The heat energy heats the evaporator 204 in the heat pipe unit 2. The heat transfer working fluid 207 in the evaporator 204 absorbs heat and turns into a gas state, and flows from the outlet end of the evaporator 204 to the inlet end of the condenser 205 through the heat pipe pipeline 201. The gaseous heat transfer working fluid 207 liquefies and releases heat inside the condenser 205. The carbonization chamber 102 is located above the heating unit 3, and the liquefied heat transfer working fluid 207 inside the condenser 205 flows back to the inlet end of the evaporator 204 under the action of gravity from its outlet end. This heating method that uses the heat pipe unit 2 to transfer the heat of the microwave absorbing material 302 to the first phase change heat storage material 105, compared with directly heating the phase change heat storage material by the microwave emission plate 303, realizes the rapid transfer of heat through the setting of the heat pipe unit 2, and there is no need to set a continuous phase change heat storage material between the outer wall of the adjacent carbonization chamber 102 and the microwave absorbing material 302. At the same time, both ends of the evaporator 204 and the condenser 205 in the heat pipe unit 2 are connected by the heat pipe pipeline 201, that is, the heat pipe unit 2 is a split heat pipe structure, so that the arrangement methods of the evaporator 204 and the condenser 205 are more flexible.

[0037] It should be noted that although the microwave emission plate 303 can directly heat coal or coal cakes, the microwave energy will cause a decrease in the effective heating power due to the differences in the dielectric loss of coke, the absorption and scattering of volatile components, and the convection loss of the gas in the furnace. In addition, due to the limited penetration ability of microwaves and the different microwave absorption abilities of substances in the coke oven, for industrial coke ovens, because the coal quality inside is large, the temperature uniformity of microwave heating is limited. By using the microwave absorbing material 302 to efficiently convert the energy from the microwave form into joule heat, on the one hand, the heat conversion efficiency is improved, and on the other hand, combined with the heat pipe unit 2, the temperature of the first phase change heat storage material 105 is precisely controlled, which is beneficial to applying microwave heating to industrial coke oven coking.

[0038] Among them, a feed port 103 for adding coal is opened at the top of the carbonization chamber 102, and a discharge port 104 for discharging coke is opened at the side. The coking unit 1 further includes a furnace wall 101, the furnace wall 101 is wrapped outside a plurality of carbonization chambers 102, and is provided with through holes corresponding to the feed port 103 and the discharge port 104 respectively. A first heat insulation layer 106 is provided on the inner side wall or the outer side wall of the furnace wall 101. Preferably, the furnace wall 101 can be selected as high-alumina bricks or silica bricks. More preferably, the inner side wall of the carbonization chamber 102 is coated with an aluminum-silicon coating for improving its high temperature resistance and corrosion resistance.

[0039] Among them, the evaporator 204 is preferably made of molybdenum rhenium alloy. Further preferably, an HfC / YAG (hafnium carbide / yttrium aluminum garnet) coating is applied to its exterior to reduce damage to the evaporator 204 by microwaves. Even more preferably, fins can be installed on the exterior of the evaporator 204 to enhance the heat transfer effect.

[0040] Among them, the condenser 205 is preferably made of stainless steel or the like, and a ceramic-based coating is applied to its exterior to increase its corrosion resistance and high-temperature resistance.

[0041] Among them, the microwave absorbing material 302 is preferably granular and can be selected to be made of a silicon carbide-based composite material or a ferrite-alumina gradient material.

[0042] As an extended solution, the phase change material inside the first phase change heat storage material 105 can be selected as molten salt, or a composite phase change material can be used, such as Al-Si alloy, Cu-Si, Cu-Mg and other Cu-based alloys.

[0043] Specifically, referring to Figure 4 、 Figure 5 As shown, a check valve 202 is also provided inside the heat pipe unit 2. The check valve 202 is located in the heat pipe line 201 between the outlet end of the evaporator 204 and the inlet end of the condenser 205, and is used to restrict the reverse flow of the heat transfer working fluid 207 from the inlet end of the condenser 205 to the outlet end of the evaporator 204. The carbonization chamber 102 of the coke oven generally uses intermittent heating. When the microwave emitting plate 303 stops heating the microwave absorbing material 302. At this time, the temperature of the evaporator 204 drops relatively quickly, while the condenser 205 is embedded in the first phase change heat storage material 105, resulting in the temperature of the condenser 205 being higher than that of the evaporator 204. At this time, the pressure inside the condenser 205 is too high, so reverse flow of the gaseous heat transfer working fluid 207 may be caused, especially when the evaporator 204 starts heating from room temperature. To prevent the gaseous heat transfer working fluid 207 from flowing back from the condenser 205 to the evaporator 204, that is, to prevent heat from being transferred back from the first phase change heat storage material 105 to the microwave absorbing material 302, a check valve 202 is therefore provided between the condenser 205 and the evaporator 204.

[0044] The temperature of coke oven coking is usually above 1000°C. Therefore, the working environment of the heat pipe unit 2 is relatively harsh. To maintain the long-term stable operation of the check valve 202 in a high-temperature environment, the check valve 202 preferably adopts a Tesla valve structure, which includes a main channel 221 and a plurality of check branches connected to the main channel 221. The plurality of check branches are arranged on one side or both sides of the main channel 221.

[0045] To further reduce heat dissipation, a heat-insulating layer is provided on the corresponding pipe sections of the heat pipe line 201 located outside the heating unit 3 and the coking unit 1 and wrapped around its exterior.

[0046] Further, a flow-limiting component 203 is further provided inside one end of the check valve 202 close to the evaporator 204. The flow-limiting component 203 includes a flow-limiting branch communicating with the main channel 221. The flow-limiting branch and the check branch located on the other side of the main channel 221 are centrosymmetric figures and are arranged staggeredly along the axis of the main channel 221.

[0047] Among them, by arranging the flow-limiting component 203 at one end of the check valve 202 close to the evaporator 204, this end is the end of the heat transfer working medium 207 flowing in the check valve 202 along the flow-limiting direction. When the heat transfer working medium flows to this end of the check valve 202, the heat transfer working medium 207 therein is already relatively less, that is, the heat transfer working medium flowing back from the condenser 205 into the evaporator 204 gradually decreases along the flow-limiting direction of the check valve 202. Arranging the flow-limiting component 203 at this end has little influence on the one-way flow-limiting effect of the check valve 202. Therefore, it is preferably to arrange the flow-limiting component 203 at this end of the evaporator 204.

[0048] Reference Figure 5 As shown, the check branch includes a check wing-shaped obstacle 223 and a check bend 222. The check wing-shaped obstacle 223 is located inside the check bend 222 to form the check branch. Both openings on both sides of the check bend 222 communicate with the main channel 221. The main channel 221 and the check branch are both prior arts in this field and will not be elaborated here.

[0049] As an expansion scheme, reference Figure 4 、 Figure 5 As shown, the flow-limiting branch includes a flow-limiting wing-shaped obstacle 234 and a flow-limiting bend 235. The flow-limiting wing-shaped obstacle 234 is located inside the flow-limiting bend 235 to form the flow-limiting branch. The flow-limiting branch and the check branch located on the other side of the main channel 221 form a centrosymmetric figure, that is, the structures of the flow-limiting branch and the check branch are the same and there are limitations on the relative positions. The flow-limiting branch plays a role in reducing the flow velocity of the heat transfer working medium 207 flowing from the evaporator 204 to the condenser 205.

[0050] It should be noted that the structures and the relative position relationships of the flow-limiting branch and the check branch can also adopt other designs. The gaseous heat transfer working medium 207 flows from the main channel 221 into the flow-limiting branch. The direction of the heat transfer working medium 207 flowing into the flow-limiting branch forms an acute angle with the flow direction of the heat transfer working medium in the main channel 221. The direction of the heat transfer working medium 207 flowing out of the flow-limiting branch forms an obtuse angle with the flow direction of the heat transfer working medium 207 in the main channel 221, that is, the direction of the heat transfer working medium flowing out of the flow-limiting branch is opposite to the flow direction of the heat transfer working medium in the main channel 221, and a collision occurs at the intersection, thereby reducing the flow velocity inside the main channel 221.

[0051] As an expansion scheme, reference Figure 4 、 Figure 6As shown, an adjusting baffle 231 is further provided inside the main channel 221, and the adjusting baffle 231 is used to control the opening degree of the main channel 221.

[0052] As a further expansion solution, one end of the rotating shaft of the adjusting baffle 231 extends to the outside of the heat pipe pipeline 201, the adjusting transmission member 232 and the adjusting driving member 233 are located outside the heat pipe pipeline 201, and the adjusting driving member 233 drives the adjusting baffle 231 to rotate through the adjusting transmission member 232, so as to control the opening degree of the main channel 221.

[0053] It should be noted that by setting the current-limiting branch, the flow directions of the current-limiting branch and the reverse-blocking branch are opposite at the intersection, resulting in a collision, so that the internal flow rate is reduced, and its current-limiting effect is limited. Further, an adjusting baffle 231 is added, and the opening degree of the main channel 221 is controlled by rotating the adjusting baffle 231 to achieve a better current-limiting effect.

[0054] Among them, the current-limiting component 203 is arranged on the corresponding pipeline of the heat pipe pipeline 201 outside the heating unit 3 and the coking unit 1, so as to facilitate the operation of the adjusting driving member 233 and reduce the limitation on the type selection of the adjusting driving member 233.

[0055] To realize the automatic adjustment of the rotation angle of the adjusting baffle 231, preferably, the adjusting driving member 233 is a motor, and the adjusting transmission member 232 is a gear set. The adjusting driving member 233 is controlled by the control unit 4 to rotate, and the adjusting driving member 233 drives the rotating shaft in the adjusting baffle 231 to rotate through the adjusting transmission member 232.

[0056] As a further preference for any of the above embodiments, a plurality of microwave emitting plates 303 and a plurality of evaporators 204 are alternately and spaced apart in the microwave absorbing material 302, which is beneficial to improving the temperature uniformity inside the heating unit 3. At the same time, the evaporator 204 and the microwave emitting plate 303 do not directly contact, and only the energy conversion and transmission are carried out between the two through the microwave absorbing material 302, thereby reducing the restrictions on the selection of the heat pipe wall material and the heat transfer working fluid 207 in the heat pipe unit 2.

[0057] To improve the heat transfer performance of the heat pipe unit 2, the heat transfer working fluid 207 includes an alkali metal working fluid and nanoparticles. Among them, the alkali metal working fluid can be selected as sodium, potassium or molten salt, etc., and the nanoparticles can be selected as alumina, graphene, etc.

[0058] To improve the flow efficiency of the heat transfer working fluid 207 in the heat pipe pipeline 201, refer to Figure 10 As shown, the inside of the heat pipe pipeline 201 is a capillary microgroove structure. Specifically, the inner wall of the heat pipe pipeline 201 is etched to form capillary microgrooves.

[0059] In some other specific embodiments, the heat pipe unit 2 further includes a working medium regulating valve 206. The working medium regulating valve 206 is connected to the heat pipe pipeline 201 and is used to evacuate the heat pipe pipeline 201 or control the amount of heat transfer working medium in the heat pipe unit 2. Preferably, the working medium regulating valve 206 is arranged near the outlet end of the evaporator 204.

[0060] In order to make full use of the thermal energy of the microwave absorbing material, the inner wall of the second housing 304 is filled with a second phase change heat storage material 301; the excess heat that is not absorbed by the evaporator 204 is stored by the second phase change heat storage material 301.

[0061] Preferably, a plurality of single-row temperature sensors 107 are arranged at intervals in the height direction inside the carbonization chamber 102. The temperature sensors 107 feed back the detected temperature to the control unit 4, and the control unit 4 adjusts the output power of the microwave emitting plate 303 and the specific intermittent working mode accordingly to maintain the relatively stable temperature inside the carbonization chamber 102.

[0062] As a preferred embodiment of the microwave emitting plate 303, refer to Figures 7-9 As shown, there is also a heat dissipation unit 305 inside the microwave emitting plate 303. The heat dissipation unit is used to transfer the heat inside the microwave emitting plate 303 to the outside of the second housing 304.

[0063] Specifically, the heat dissipation unit 305 includes a plurality of gravity heat pipes 354; the upper ends of the plurality of gravity heat pipes 354 are respectively arranged inside the plurality of microwave emitting plates 303, and the lower ends extend to the outside of the second housing 304. More specifically, the lower ends of the gravity heat pipes 354 are arranged inside the heat dissipation housing 353, and a heat dissipation fan 352 is arranged inside the heat dissipation housing 353 and is used to dissipate the heat inside the heat dissipation housing 353 to the outside thereof, that is, to air-cool the lower ends of the gravity heat pipes 354, thereby reducing the temperature of the microwave emitting plate 303 and improving its service life. Further preferably, a plurality of heat dissipation fins 351 are provided at the lower end of each single gravity heat pipe 354 to improve its heat dissipation efficiency.

[0064] As another embodiment for reducing the working temperature of the microwave emitting plate 303, a heat insulation plate made of a heat insulation material is covered outside the microwave emitting plate 303, and this heat insulation material can allow microwaves to penetrate, for example, it can be made of a BN (boron nitride) composite material, so as to reduce the adverse effect of the temperature rise of the microwave absorbing material 302 on the microwave emitting plate 303.

[0065] The above has schematically described the present invention and its embodiments. This description is not restrictive, and only one of the embodiments of the present invention is shown in the drawings. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A coking device based on phase change heat transfer, characterized in that Comprising: A plurality of heat pipe units (2), each of the plurality of heat pipe units (2) includes an evaporator (204) and a condenser (205), wherein the evaporator (204) and the condenser (205) are connected by a heat pipe pipeline (201) to form a closed circulation loop, and a heat transfer working medium (207) circulates inside the closed circulation loop; A heating unit (3), the heating unit (3) includes a second housing (304), the inside of the second housing (304) is filled with a microwave absorbing material (302) and is provided with a plurality of microwave emitting plates (303) for heating the microwave absorbing material (302), and the evaporators (204) in the heat pipe units (2) are all installed inside the second housing (304), and heat is provided to the evaporators (204) through the microwave absorbing material (302); And a coking unit (1), the coking unit (1) includes a plurality of carbonization chambers (102) distributed at intervals, the carbonization chambers (102) are located above the heating unit (3), and a first phase change heat storage material (105) is provided in the gap between adjacent carbonization chambers (102), and the condensers (205) in the heat pipe units (2) are all installed inside the first phase change heat storage material (105), and heat is provided to the first phase change heat storage material (105) through the condensers (205).

2. The coking device based on phase change heat transfer according to claim 1, wherein A check valve (202) is further provided inside the heat pipe pipeline (201), and the check valve (202) is located in the heat pipe pipeline (201) between the outlet end of the evaporator (204) and the inlet end of the condenser (205) for restricting the heat transfer working medium (207) from flowing back from the inlet end of the condenser (205) to the outlet end of the evaporator (204).

3. The coking device based on phase change heat transfer according to claim 2, wherein The check valve (202) adopts a Tesla valve structure, which includes a main channel (221) and a plurality of check branches communicated with the main channel (221), and the plurality of check branches are arranged on one side or both sides of the main channel (221).

4. The coking device based on phase change heat transfer according to claim 3, wherein A flow limiting component (203) is further provided inside the check valve (202) near one end of the evaporator (204), and the flow limiting component (203) includes a flow limiting branch communicated with the main channel (221), and the flow limiting branch and the check branch located on the other side of the main channel (221) are centrosymmetric figures and are arranged staggered along the axis of the main channel (221).

5. The coking device based on phase change heat transfer according to claim 3 or 4, characterized in that An adjusting flap (231) is further provided inside the main channel (221), and the adjusting flap (23) is used to control the opening degree of the main channel (221).

6. The coking device based on phase change heat transfer according to claim 5, characterized in that, One end of the rotating shaft in the adjusting flap (231) extends to the outside of the heat pipe pipeline (201), an adjusting transmission member (232) and an adjusting driving member (233) are located outside the heat pipe pipeline (201), and the adjusting driving member (233) drives the adjusting flap (231) to rotate through the adjusting transmission member (232), thereby controlling the opening degree of the main channel (221).

7. The coking device based on phase change heat transfer according to claim 6, characterized in that, The adjusting driving member (233) adopts a motor, and the adjusting transmission member (232) adopts a gear set.

8. The coking device based on phase change heat transfer according to any one of claims 1-4, characterized in that A plurality of microwave emitting plates (303) and a plurality of evaporators (204) are alternately and spacedly distributed inside the second housing (304); the heat transfer working fluid (207) includes an alkali metal working fluid and nanoparticles; the interior of the heat pipe pipeline (201) is a capillary microgroove structure.

9. The coking device based on phase change heat transfer according to any one of claims 1-4, characterized in that, A working fluid regulating valve (206) connected to the heat pipe pipeline (201) is provided inside the heat pipe unit (2) for evacuating the heat pipe pipeline (201) or controlling the amount of the heat transfer working fluid (207) in the heat pipe unit (2).

10. The coking device based on phase change heat transfer according to any one of claims 1-4, characterized in that, The interior of the shell wall of the second housing (304) is filled with a second phase change heat storage material (301); a plurality of temperature sensors (107) are provided inside the carbonization chamber (102) at intervals in the height direction.

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