Exhaust gas waste heat recovery system and air conditioning unit

Abstract

The application relates to a waste gas waste heat recovery system and an air conditioning unit, relates to the technical field of flue gas waste heat recovery, and aims to provide a tail gas waste heat collection device capable of directly utilizing waste gas combustion treatment. The waste gas waste heat recovery system comprises a combustion furnace, a heat accumulator, a first flue pipe, a second flue pipe, a chimney and a third flue pipe. The heat accumulator is filled with inositol medium, the first flue pipe is connected between the combustion furnace and the heat accumulator, is used for guiding flue gas generated by the combustion furnace into the heat accumulator, and makes the inositol medium absorb the heat of the flue gas. The second flue pipe is connected between the heat accumulator and the chimney, is used for guiding the flue gas flowing through the heat accumulator to the chimney for discharge. The third flue pipe is connected between the combustion furnace and the chimney, is used for guiding the flue gas generated by the combustion furnace to the chimney for discharge. At least one of the third flue pipe and the first flue pipe is in communication.

Description

Technical Field

[0001] This application relates to the field of flue gas waste heat recovery technology, and in particular to a waste gas waste heat recovery system and an air conditioning unit. Background Technology

[0002] Industrial production processes generate a significant amount of waste gas, which is often treated by combustion in furnaces before being released. However, because the exhaust gas has a high temperature, directly releasing it results in energy waste. Utility Model Content

[0003] This application provides a waste heat recovery system and an air conditioning unit, aiming to provide a waste heat collection device that can directly utilize the exhaust gas from combustion treatment.

[0004] In one aspect, some embodiments of this application provide a waste heat recovery system, including a combustion furnace, a heat accumulator, a first flue, a second flue, a chimney, and a third flue. The heat accumulator is filled with an inositol medium. The first flue connects the combustion furnace and the heat accumulator, and is used to guide the flue gas generated by the combustion furnace into the heat accumulator so that the inositol medium absorbs the heat from the flue gas. The second flue connects the heat accumulator and the chimney, and is used to guide the flue gas flowing through the heat accumulator to the chimney for discharge. The third flue connects the combustion furnace and the chimney, and is used to guide the flue gas generated by the combustion furnace to the chimney for discharge. At least one of the third flue and the first flue is electrically connected.

[0005] In some embodiments, the heat accumulator includes a heat storage shell and heat exchange piping. The heat storage shell is filled with inositol medium, and the heat exchange piping is disposed within the heat storage shell. One end of the heat exchange piping is connected to the first flue pipe, and the other end of the heat exchange piping is connected to the second flue pipe.

[0006] In some embodiments, the number of heat storage shells is at least two, the at least two heat storage shells are spaced apart, and each heat storage shell is provided with at least one heat exchange pipeline.

[0007] In some embodiments, the heat accumulator includes a third valve between the first flue and the heat accumulator shell, and the heat exchange pipeline is connected to the third valve for controlling the opening or closing of the heat exchange pipeline.

[0008] In some embodiments, the heat accumulator includes at least two fins that are at least partially in contact with the heat storage shell, and the at least two fins are spaced apart along the height or thickness direction of the heat storage shell.

[0009] In some embodiments, the heat storage shell is made of metallic copper or a copper alloy.

[0010] In some embodiments, the heat exchange pipeline is made of metallic copper or a copper alloy.

[0011] In some embodiments, the heat exchange pipeline is a coil structure within the heat storage shell.

[0012] In some embodiments, the waste heat recovery system further includes a first valve and a second valve. Between the combustion furnace and the heat accumulator, the first flue is connected to the first valve for controlling the opening or closing of the first flue. Between the combustion furnace and the chimney, a third flue is connected to the second valve for controlling the opening or closing of the third flue.

[0013] Secondly, some embodiments of this application provide an air conditioning unit, including a casing, a fan, and the waste heat recovery system mentioned above, wherein the heat accumulator is disposed within the casing. The fan is disposed within the casing to drive airflow through the heat accumulator.

[0014] In some embodiments, the air conditioning unit includes a first temperature sensor, a second temperature sensor, and a controller. The first temperature sensor is located at the heat storage tank and is used to detect the temperature of the heat storage tank. The second temperature sensor is located downstream of the heat storage tank along the airflow direction and is used to detect the air temperature. The controller is electrically connected to at least the first temperature sensor, the second temperature sensor, and the fan.

[0015] In some embodiments, the number of heat accumulators is at least two. At least two heat accumulators are spaced apart within the housing along the direction of airflow.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] When the waste heat recovery system is in heat storage mode, the first valve opens to open the first flue pipe, and the second valve closes to disconnect the third flue pipe. High-temperature flue gas flows through the heat accumulator to heat the inositol medium inside. The inositol medium absorbs heat, heats up, and eventually melts into a liquid state, storing latent heat. The low-temperature flue gas, having completed heat exchange, is discharged through the second flue pipe and the chimney. When the heat accumulator temperature reaches a set threshold (to completely melt the inositol medium) or maintenance is required, the second valve opens to open the third flue pipe, and the flue gas is directly discharged through the third flue pipe and the chimney. The inositol medium inside the heat accumulator can transfer heat to the corresponding area through an external circulation system (such as an air conditioning unit).

[0018] Compared to solutions using water as the heat storage medium, liquid water has a lower upper temperature limit, far less than the phase change temperature range of inositol media. Furthermore, liquid water continuously cools down during heat release, with a temperature drop exceeding 50 degrees Celsius, further lowering the upper temperature limit of the heat storage medium. Inositol media, on the other hand, can control temperature fluctuations within 10 degrees Celsius during the phase change stage, exhibiting smaller temperature fluctuations. Moreover, the phase change temperature of the inositol matrix is ​​greater than 220 degrees Celsius, making it a higher-grade heat source with a wider range of applications. In existing technologies, fixed flue ducts cannot adjust the flue gas path according to the heat accumulator's status, increasing the risk of system shutdown when the heat accumulator overheats. This solution achieves continuous operation capability through a switchable flue structure. Furthermore, the heat storage capacity per unit volume of water is approximately 165 MJ, while this solution increases the heat storage capacity per unit volume to approximately 600 MJ by using inositol media, thereby significantly increasing the heat storage density and facilitating a substantial reduction in equipment size or an increase in heat storage capacity. The high heat storage density means that the waste heat recovery system does not need to frequently switch the on and off states of the first flue pipe during operation, which helps to improve the system's service life.

[0019] This application achieves efficient recovery and stable output of high-grade waste heat. The isothermal characteristics of the inositol medium within the phase change temperature range improve the temperature control accuracy of the heat exchange process, avoiding system oscillations caused by the wide temperature range heat exchange of traditional water media. The switchable flue structure ensures continuous system operation even under accumulator maintenance or overload conditions. When the above-mentioned waste heat recovery system is applied to an air conditioning unit, using the accumulator as a heat source for heating, the high heat storage temperature of the inositol medium can quickly heat the flowing air, significantly improving heating efficiency, thereby increasing the overall heating power and air volume. Furthermore, the isothermal heat release characteristics of the inositol medium within the phase change range facilitate precise control of the outlet air temperature. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a schematic diagram of the structure of an air conditioning unit provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 A side view of the heat accumulator 120 shown in the figure;

[0025] Figure 3 for Figure 2 Cross-sectional view along line AA;

[0026] Figure 4 This is a schematic diagram of the electrical connection of an air conditioning unit provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Waste heat recovery system;

[0029] 110. Combustion furnace;

[0030] 120. Heat accumulator; 121. Heat accumulator shell; 122. Heat exchange piping; 123. Third valve; 124. Fins;

[0031] 130. First flue pipe; 140. Second flue pipe; 150. Chimney; 160. Third flue pipe; 170. First valve; 180. Second valve;

[0032] 200. Housing;

[0033] 300. Fan;

[0034] 400. Humidifier;

[0035] 510, First temperature sensor; 520, Second temperature sensor; 530, Controller; 540, First humidity sensor; 550, Second humidity sensor. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0038] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0039] Figure 1 This is a schematic diagram of the structure of an air conditioning unit provided in an embodiment of this application. Figure 2 for Figure 1 A side view of the heat accumulator 120 shown. Figure 3 for Figure 2 Cross-sectional view along line AA. Figure 4 This is a schematic diagram of the electrical connection of an air conditioning unit provided in an embodiment of this application.

[0040] Industrial production processes generate a significant amount of waste gas, which is often treated by combustion in furnaces before being released. However, because the exhaust gas has a high temperature, directly releasing it results in energy waste.

[0041] In relevant technical solutions, water is often used as the heat storage medium to recover and utilize waste heat from exhaust gases. However, water-based heat storage systems are difficult to recover high-grade waste heat and cannot provide a stable heat source output.

[0042] For example, if the operating temperature range of the water-based heat storage device does not exceed 100°C, the device can only output heat energy as a low-grade heat source within 100°C, thus limiting its applicability. Furthermore, as heat is lost, the temperature of the heat source will continue to decrease, further affecting the heat output effect.

[0043] If the operating temperature range of the water-based thermal storage device exceeds 100℃, there are two operating states. The first is to increase the boiling point of the water in a high-pressure container so that it remains liquid above 100℃. However, the increased container pressure significantly increases costs and poses considerable safety hazards. Furthermore, as heat is lost, the temperature of the heat source will continuously decrease, affecting the heat output. The second state involves vaporizing the water in a large-capacity container, but vaporization leads to a significant reduction in the thermal storage density.

[0044] Based on this, please refer to Figures 1 to 4 This application provides a waste heat recovery system and an air conditioning unit, aiming to provide a waste heat collection device that can directly utilize the exhaust gas from combustion treatment.

[0045] like Figure 1 As shown, the air conditioning unit includes a waste heat recovery system 100, a casing 200, and a fan 300. The fan 300 is installed inside the casing 200 to drive airflow, and can regulate the temperature and humidity of the air to a suitable range and blow it to a preset location through heat exchange devices or humidity regulators.

[0046] like Figure 1 and Figure 2 As shown, the waste heat recovery system 100 includes a combustion furnace 110, a heat accumulator 120, a first flue 130, a second flue 140, a chimney 150, and a third flue 160. The first flue 130 connects the combustion furnace 110 and the heat accumulator 120, guiding the flue gas generated by the combustion furnace 110 into the heat accumulator 120, allowing the inositol medium within the heat accumulator 120 to absorb heat from the flue gas, thereby increasing its temperature or causing a phase change. The second flue 140 connects the heat accumulator 120 and the chimney 150, guiding the flue gas flowing through the heat accumulator 120 to the chimney 150 for discharge, i.e., guiding the heat-exchanged flue gas to the chimney 150. The third flue 160 connects the combustion furnace 110 and the chimney 150, directly guiding the flue gas generated by combustion to the chimney 150 for discharge. At least one of the third flue 160 and the first flue 130 is connected. Thus, when the first flue pipe 130 is turned on, the flue gas generated by the combustion furnace 110 passes through the first flue pipe 130 to the accumulator 120 to heat the accumulator 120 and the inositol medium inside it, and the flue gas itself is cooled by the inositol medium and then discharged through the second flue pipe 140 to the chimney.

[0047] Either the first flue pipe 130 or the third flue pipe 160 can be selectively connected. If the first flue pipe 130 is connected and the third flue pipe 160 is closed, the inositol medium at the heat accumulator 120 can be heated by flue gas. Alternatively, if the first flue pipe 130 is closed and the third flue pipe 160 is connected, and the inositol medium at the heat accumulator 120 is heated to the target temperature, the flue gas can be directly discharged through the third flue pipe 160. Or, if both the first flue pipe 130 and the third flue pipe 160 are connected, the inositol medium at the heat accumulator 120 can be continuously heated by a lower flue gas flow rate; this is not limited.

[0048] For example, such as Figure 1 As shown, the waste heat recovery system 100 includes a first valve 170 and a second valve 180. Between the combustion furnace 110 and the heat accumulator 120, a first flue 130 is connected to the first valve 170 for controlling the opening or closing of the first flue 130. Between the combustion furnace 110 and the chimney 150, a third flue 160 is connected to the second valve 180 for controlling the opening or closing of the third flue 160.

[0049] The first valve 170 and the second valve 180 can be electric or pneumatic valves, facilitating the adjustment of the open and closed states of the first flue pipe 130 and the third flue pipe 160 via an automated control system. The opening and closing control of the first valve 170 can adjust the flow rate of high-temperature flue gas into the heat accumulator 120 according to system operating requirements, thereby controlling the heating process of the heat accumulator 120. When the second valve 180 is open, it allows the flue gas to be directly directed to the chimney 150 for discharge when the heat accumulator 120 does not require heating or maintenance, thus avoiding localized high pressure situations caused by the inability to discharge flue gas smoothly when the first valve 170 is closed.

[0050] When the system needs to utilize waste heat from flue gas, the first valve 170 opens and the second valve 180 closes, allowing the high-temperature flue gas to enter the heat accumulator 120 through the first flue pipe 130 for heat storage. When the system needs to rapidly discharge flue gas or the heat accumulator 120 reaches saturation, the first valve 170 closes and the second valve 180 opens, allowing the flue gas to be directly discharged into the chimney through the third flue pipe 160. Alternatively, the first valve 170 and the second valve 180 can be opened to increase the flue gas discharge rate, allowing the system to rapidly discharge flue gas while simultaneously replenishing the heat accumulator 120 with heat. Thus, through the coordinated control of the first valve 170 and the second valve 180, the system can flexibly switch the flue gas flow direction according to actual operating conditions, ensuring the heat accumulator 120 operates within its operating range while avoiding the high-pressure system hazards caused by flue gas stagnation.

[0051] It should be noted that inositol mediator refers to an organic compound (also known as cyclohexanehexol or vitamin B8) that can absorb or release heat through a phase transition process. Specifically, it can be crystalline inositol solid or powder (at room temperature) with a purity higher than 98% filled in a sealed container. The phase transition temperature range for inositol from solid to liquid is 220-228℃. When solid inositol mediator is heated to 220℃, it continues to absorb a large amount of heat to undergo a phase transition, thus storing a significant amount of heat as latent heat with minimal temperature change. In other words, inositol mediator can release a large amount of latent heat within the 220-228℃ range, with a relatively small temperature drop, maintaining a constant temperature output.

[0052] The first flue duct 130 can be a metal structure with an outer insulation layer to reduce heat loss during flue gas flow. Alternatively, the first flue duct 130, the second flue duct 140, and the third flue duct 160 can also be made of ceramic or concrete or other structures, which have good thermal insulation effects. This is used to quickly guide high-temperature flue gas from the combustion furnace 110 to the heat accumulator 120 for heat exchange and storage.

[0053] The third flue 160 refers to the bypass channel connecting the combustion furnace 110 and the chimney 150. The first flue 130 and the third flue 160 can be set independently, or the first flue 130 and the third flue 160 can be set to overlap and share a section near the combustion furnace 110. There is no limitation on this.

[0054] Thus, when the waste heat recovery system 100 is in heat storage mode, the first valve 170 opens to connect the first flue pipe 130, and the second valve 180 closes to disconnect the third flue pipe 160. High-temperature flue gas flows through the heat accumulator 120 to heat the inositol medium inside. The inositol medium absorbs heat, heats up, and eventually melts into a liquid state, storing latent heat. The low-temperature flue gas, having completed heat exchange, is discharged through the second flue pipe 140 and the chimney 150. When the temperature of the heat accumulator 120 reaches a set threshold (to completely melt the inositol medium) or maintenance is required, the second valve 180 opens to connect the third flue pipe 160, and the flue gas is directly discharged through the third flue pipe 160 and then through the chimney 150. The inositol medium within the heat accumulator 120 can transfer heat to the corresponding area through an external circulation system (such as an air conditioning unit).

[0055] Compared to solutions using water as the heat storage medium, liquid water has a lower upper temperature limit, far less than the phase change temperature range of inositol media. Furthermore, liquid water continuously cools down during heat release, with a temperature drop exceeding 50 degrees Celsius, further lowering the upper temperature limit of the heat storage medium. Inositol media, on the other hand, can control temperature fluctuations within 10 degrees Celsius during the phase change stage, exhibiting smaller temperature fluctuations. Moreover, the phase change temperature of the inositol matrix is ​​greater than 220 degrees Celsius, making it a higher-grade heat source with a wider range of applications. In existing technologies, fixed flue ducts cannot adjust the flue gas path according to the heat accumulator's status, increasing the risk of system shutdown when the heat accumulator overheats. This solution achieves continuous operation capability through a switchable flue structure. Furthermore, the heat storage capacity per unit volume of water is approximately 165 MJ, while this solution increases the heat storage capacity per unit volume to approximately 600 MJ by using inositol media, thereby significantly increasing the heat storage density and facilitating a substantial reduction in equipment size or an increase in heat storage capacity. The high heat storage density means that the waste heat recovery system 100 does not need to frequently switch the on and off states of the first flue pipe 130 during operation, which helps to improve the service life of the system.

[0056] This application achieves efficient recovery and stable output of high-grade waste heat. The isothermal characteristics of the inositol medium within the phase change temperature range improve the temperature control accuracy of the heat exchange process, avoiding system oscillations caused by the wide temperature range heat exchange of traditional water media. The switchable flue structure ensures continuous system operation even under maintenance or overload conditions of the heat accumulator 120. When the above-mentioned waste heat recovery system 100 is applied to an air conditioning unit to use the heat accumulator 120 as a heat source for heating, the high heat storage temperature of the inositol medium can quickly heat the flowing air, significantly improving heating efficiency, thereby increasing the overall heating power and air volume. Furthermore, the isothermal heat release characteristics of the inositol medium within the phase change range facilitate precise control of the outlet air temperature.

[0057] In addition, the waste heat recovery system 100 can also be used in the field of hot water supply, such as heating water through a heat storage device 120 to stabilize the supply of hot water. The higher temperature of the inositol medium can significantly improve the heating efficiency of the water, thereby increasing the hot water supply.

[0058] In some embodiments, such as Figure 2 and Figure 3 As shown, the heat accumulator 120 includes a heat storage shell 121 and a heat exchange pipeline 122. The heat storage shell 121 is filled with inositol medium. The heat exchange pipeline 122 is disposed inside the heat storage shell 121, one end of the heat exchange pipeline 122 is connected to the first flue pipe 130, and the other end of the heat exchange pipeline 122 is connected to the second flue pipe 140.

[0059] The heat storage shell 121 is a sealed container for containing the inositol medium, which can be implemented using a welded metal box structure. Its internal space is used to store the phase change material. The heat exchange pipe 122 is a heat transfer channel for the flow of high-temperature flue gas. The heat exchange pipe 122 installed in the heat storage shell 121 enables heat exchange between the high-temperature flue gas and the inositol medium on both the inner and outer sides, so that the high-temperature flue gas heats the inositol medium in the heat storage shell 121.

[0060] The high-temperature flue gas generated by the combustion furnace 110 enters the heat exchange pipe 122 through the first flue pipe 130, and exchanges heat with the inositol medium as it flows through the heat storage shell 121. When the flue gas temperature is higher than the melting point of inositol, inositol absorbs heat, undergoes a phase change, and stores thermal energy. The cooled flue gas is discharged through the second flue pipe 140 and the chimney 150. The heat exchange pipe 122 can be configured as a coil structure to form a tortuous and continuous flow channel within the heat storage shell 121, thereby increasing the heat exchange time and heat exchange area between the high-temperature flue gas and the inositol medium, thus improving the heat exchange efficiency between the high-temperature flue gas and the inositol medium.

[0061] The heat storage shell 121 is made of metallic copper or a copper alloy. The heat exchange pipe 122 is made of metallic copper or a copper alloy. The heat exchange pipe 122 has a coil structure inside the heat storage shell 121.

[0062] Metallic copper or copper alloys refer to metallic materials with high thermal conductivity and corrosion resistance. Specifically, they can be made of pure copper or alloys of copper with other metals, such as copper-nickel alloys or copper-aluminum alloys. The coil structure refers to the arrangement of heat exchange pipes 122 within the heat storage shell 121 in a spiral or curved form, specifically using single-layer or multi-layer spiral winding.

[0063] The heat storage shell 121 is made of metallic copper or a copper alloy, utilizing its high thermal conductivity to accelerate the heat exchange efficiency between the inositol medium and air or other external media. Simultaneously, copper's good corrosion resistance helps extend the service life of the heat storage shell 121. The heat exchange pipes 122 are also made of copper or a copper alloy, ensuring rapid heat transfer from the high-temperature flue gas inside the pipes to the inositol medium on the outside. The coil structure design extends the flow path of the flue gas within the heat exchange pipes 122, increasing the contact area and contact time with the inositol medium, thereby improving heat exchange efficiency.

[0064] The above technical solution solves the problem of low heat exchange efficiency caused by insufficient thermal conductivity of materials in traditional systems, while avoiding shortened equipment life due to corrosion. The coil structure design enhances the heat exchange capacity between flue gas and the heat storage medium, ensuring that the phase change process proceeds efficiently within a stable temperature range.

[0065] like Figure 2 and Figure 3As shown, the number of heat storage shells 121 is at least two, and the at least two heat storage shells 121 are distributed at intervals. Each heat storage shell 121 is provided with at least one heat exchange pipeline 122.

[0066] By setting at least two heat storage shells 121 spaced apart to form a modular heat exchange unit group, each heat storage shell 121 has one, two, or more heat exchange pipes 122 independently installed inside. When high-temperature flue gas enters through the first flue pipe 130, it can flow through the heat exchange pipes 122 in different shells simultaneously or in batches, causing the inositol medium to absorb heat, heat up, and undergo a phase change. The spaced arrangement of the heat storage shells 121 increases the heat exchange surface area between the system and the outside, while avoiding thermal interference between the heat storage shells 121. The flue gas flow path is optimized into a multi-channel parallel channel structure. For example, when the flue gas flow rate is large, all heat storage shells 121 can be opened for collaborative heat storage. Under low-load conditions, only some heat storage shells 121 can be selected for heat storage as needed, which is more flexible and increases the system's heat storage capacity.

[0067] like Figure 2 As shown, the heat accumulator 120 includes a third valve 123 between the first flue pipe 130 and the heat accumulator shell 121. The heat exchange pipeline 122 is connected to the third valve 123 and is used to control the opening or closing of the heat exchange pipeline 122.

[0068] Since the heat accumulator 120 is provided with at least two heat storage shells 121, at least two corresponding heat exchange pipes 122 are connected in parallel between the first flue pipe 130 and the second flue pipe 140. A third valve 123 is connected at the heat exchange pipe 122 between the heat storage shell 121 and the first flue pipe 130 (i.e., the flue gas inlet side). This third valve is an electrically controlled valve or a pneumatically controlled valve, etc., so that the corresponding heat storage shell 121 can be flexibly adjusted to allow the high-temperature flue gas to be introduced for heat exchange.

[0069] Taking the waste heat recovery system 100 applied to an air conditioning unit as a heating module as an example, the heat release rates of at least two heat storage shells 121 in the heat accumulator 120 differ due to the different amounts of air flowing through them. At this time, the third valve 123 can be used to individually adjust the connection of the corresponding heat storage shell 121 to high-temperature flue gas for heat storage, or to disconnect the high-temperature flue gas to maintain a stable heat release state. This allows the operating state of the heat exchange pipeline 122 to be actively controlled, thereby avoiding overheating of the medium or energy waste due to continuous heating, and simplifying the system maintenance process.

[0070] Continue to refer to Figure 2 and Figure 3The heat storage device 120 includes at least two fins 124, which are at least partially in contact with the heat storage shell 121. The at least two fins 124 are distributed at intervals along the height or thickness direction of the heat storage shell 121.

[0071] Fins 124 refer to extended heat dissipation structures that form a thermal conductive connection with the surface of the heat storage shell 121. Specifically, they can be achieved by welding or pressing thin metal sheets onto the surface of the shell to increase the heat dissipation contact area between the heat storage accumulator 120 and the external air or other media, thereby improving the heat transfer efficiency.

[0072] The interval distribution refers to the arrangement of fins 124 on the shell surface at a preset spacing. Specifically, they can be arranged in an equidistant or non-equidistant manner along the vertical or horizontal direction of the shell. By optimizing the density of fins 124, heat exchange efficiency and space occupation are balanced. This allows air or fluid to flow smoothly between the gaps between two adjacent fins 124 and to quickly absorb heat through the fins 124 and the heat storage shell 121.

[0073] Among them, fin 124 can be copper fins, which have high heat exchange efficiency. Alternatively, fin 124 can also be made of aluminum or aluminum alloy, which is lightweight and low cost.

[0074] In some embodiments, such as Figure 4 As shown, the air conditioning unit includes a first temperature sensor 510, a second temperature sensor 520, and a controller. The first temperature sensor 510 is disposed in the heat storage unit 120 (e.g., Figure 1 (As shown) a location for detecting the temperature of the heat accumulator 120. A second temperature sensor 520 is located downstream of the heat accumulator 120 along the airflow direction for detecting the air temperature. The controller 530 is electrically connected to at least the first temperature sensor 510, the second temperature sensor 520, and the fan 300.

[0075] The first temperature sensor 510 is a device used to monitor the temperature changes inside the heat storage tank 120 in real time. Specifically, it can be implemented using a thermocouple or a resistance temperature sensor, and is installed on the surface or inside the heat storage housing 121. It is used to detect temperature changes in the inositol medium and send temperature signals to the controller 530 in real time.

[0076] The second temperature sensor 520 is a device used to detect the temperature of the air flowing through the heat accumulator 120. Specifically, it can be implemented by an infrared temperature sensor or a contact temperature probe. It is installed downstream of the heat accumulator 120 to contact the air after heat exchange, and is used to obtain the air temperature data after heat exchange and send it to the controller 530.

[0077] The controller 530 is a device that can adjust the operating status of the fan 300 based on temperature signals. Specifically, it can be implemented using a programmable logic controller or a microprocessor. By receiving signals from the second temperature sensor 520, it dynamically adjusts the speed of the fan 300 to control the airflow, thereby maintaining the stability of the heat exchange process and keeping a stable outlet air temperature.

[0078] Continue to refer to Figure 4 The controller 530 is also electrically connected to the corresponding third valve 123. The controller 530 receives a signal from the first temperature sensor 510 to obtain the phase change state of the inositol medium. If the temperature of the inositol medium is greater than or equal to a first preset temperature (greater than the maximum temperature of the solid-liquid mixture), the controller 530 controls the third valve 123 of the corresponding heat storage shell 121 to close to stop heat storage. If the temperature of the inositol medium is less than or equal to a second preset temperature (less than the minimum temperature of the solid-liquid mixture), the controller 530 controls the third valve 123 of the corresponding heat storage shell 121 to open to supplement heat storage. This ensures that the heat storage unit 120 maintains a constant phase change heat dissipation temperature.

[0079] In addition, such as Figure 4 As shown, the controller 530 can also be electrically connected to the first valve 170 and the second valve 180 to flexibly control the first flue 130 as needed (e.g., Figure 1 (as shown) the on and off states of the second smoke pipe 140.

[0080] The waste heat recovery system 100 includes at least two heat accumulators 120, which are spaced apart within the casing 200 along the direction of air flow.

[0081] At least two heat accumulators 120 are spaced apart inside the casing along the airflow direction. When the fan 300 drives air through the casing, the air flows sequentially through each heat accumulator 120. The inositol medium filled inside each heat accumulator 120 releases heat through a phase change process. The at least two heat accumulators 120 can alternately perform heat absorption (absorbing waste heat from flue gas) and heat release operations. For example, when one heat accumulator 120 has completed its heat release, a valve can be used to switch the other heat accumulator 120 into operation, thereby achieving continuous and stable heat source output, improving heat exchange efficiency, and enhancing the waste heat utilization efficiency of the flue gas.

[0082] Alternatively, two or more heat accumulators 120 can be used to heat the flowing air sequentially. Taking two heat accumulators 120 spaced apart along the airflow direction as an example, the upstream heat accumulator 120 can preheat the flowing air, and the downstream heat accumulator 120 can heat the preheated air to a preset temperature range. Since the preheated air has a smaller heating amplitude (i.e., temperature rise) when it is reheated, it is beneficial to improve the temperature control accuracy of air heating while improving heating efficiency, thereby reducing temperature fluctuations and improving human comfort.

[0083] In addition, such as Figure 1 As shown, the air conditioning unit also includes a humidifier 400. The humidifier 400 is positioned between two spaced-apart heat storage tanks 120 to over-humidify the preheated air. The humidified air is then further heated by the second heat storage tank 120, thereby controlling the air's temperature and humidity. Through this secondary heating function, the relative humidity of the over-humidified hot air at the humidifier 400 can be adjusted to a suitable range before being blown into the room, preventing the indoor air from becoming dry while heating it. Furthermore, by increasing air humidity through humidification and further adjusting it through secondary heating, the relative humidity range of the blown hot air can be precisely controlled.

[0084] Based on, such as Figure 4 As shown, the air conditioning unit also includes a first humidity sensor 540 and a second humidity sensor 550 electrically connected to the controller 530. The first humidity sensor 540 is located between the humidifier 400 and the downstream heat storage tank 120 to detect the humidity of the air after initial humidification. The second humidity sensor 550 is located downstream of the heat storage tank 120 to detect the final humidity of the heated air. The controller 530 is also electrically connected to the humidifier 400 to obtain corresponding humidity parameters through the first humidity sensor 540 and the second humidity sensor 550, and to adjust the final humidity of the heated air by controlling the start-up, shutdown, and operating power of the humidifier 400.

[0085] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0086] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0087] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A waste heat recovery system for exhaust gas, characterized in that, include: Combustion furnace; A heat accumulator filled with an inositol medium; The first flue pipe is connected between the combustion furnace and the heat accumulator, and is used to introduce the flue gas generated by the combustion furnace into the heat accumulator so that the inositol medium absorbs the heat of the flue gas. chimney; The second flue pipe connects the heat accumulator and the chimney, and is used to guide the flue gas flowing through the heat accumulator to be discharged through the chimney; And a third flue pipe, which is connected between the combustion furnace and the chimney, for guiding the flue gas generated by the combustion furnace to be discharged through the chimney; The third smoke pipe and at least one of the first smoke pipe are connected.

2. The exhaust heat recovery system according to claim 1, characterized by, The heat storage device includes: A heat storage shell, wherein the heat storage shell is filled with an inositol medium; And a heat exchange pipeline is provided inside the heat storage shell, one end of the heat exchange pipeline is connected to the first flue pipe, and the other end of the heat exchange pipeline is connected to the second flue pipe.

3. The exhaust heat recovery system according to claim 2, characterized by, The number of heat storage shells is at least two, and the at least two heat storage shells are distributed at intervals. Each heat storage shell is provided with at least one heat exchange pipeline.

4. The exhaust heat recovery system according to claim 3, characterized by The heat storage device includes: A third valve is located between the first flue and the heat storage shell. The heat exchange pipeline is connected to the third valve, which is used to control the opening or closing of the heat exchange pipeline.

5. The exhaust heat recovery system according to claim 2, characterized by The heat storage device includes: At least two fins are provided, which are at least partially in contact with the heat storage shell, and the at least two fins are spaced apart along the height or thickness direction of the heat storage shell.

6. The exhaust heat recovery system according to any one of claims 2 to 5, characterized by, The heat storage shell is made of metallic copper or a copper alloy; and / or, The heat exchange pipeline is made of metallic copper or a copper alloy; and / or, The heat exchange pipeline is a coil structure inside the heat storage shell.

7. The exhaust heat recovery system according to any one of claims 1 to 5, characterized by, The waste heat recovery system also includes: A first valve is located between the combustion furnace and the heat accumulator, and the first flue pipe is connected to the first valve to control the opening or closing of the first flue pipe; And a second valve, located between the combustion furnace and the chimney, wherein the third flue pipe is connected to the second valve for controlling the opening or closing of the third flue pipe.

8. An air conditioning unit characterized by, include: chassis; The waste heat recovery system according to any one of claims 1-7, wherein the heat accumulator is disposed inside the casing; And a fan, which is disposed inside the housing to drive air to flow through the heat accumulator.

9. The air conditioning unit of claim 8, wherein, The air conditioning unit includes: A first temperature sensor is installed at the heat accumulator to detect the temperature of the heat accumulator; The second temperature sensor is located downstream of the heat accumulator along the direction of air flow and is used to detect the air temperature. And a controller, which is electrically connected to at least the first temperature sensor, the second temperature sensor and the fan.

10. The air conditioning unit of claim 8 or 9, wherein The number of heat accumulators is at least two; Along the direction of airflow, at least two of the heat accumulators are spaced apart within the housing.

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