Variable-temperature solar curing barn group, energy storage method and baking method

Abstract

The invention relates to the technical field of baking systems, and provides a variable-temperature solar baking room group, an energy storage method and a baking method. The curing barn group comprises a plurality of drying chambers, and the working stages of the drying chambers comprise a temperature maintaining stage, a low temperature rise rate stage and a temperature rise moisture removal stage; each drying chamber is provided with a heat exchanger; the low-temperature heat collector is used for providing heat for temperature maintenance and / or a low-temperature rising rate stage after being communicated with the heat exchanger, and the highest temperature provided by the low-temperature heat collector is recorded as T1; the high-temperature heat collector is used for providing heat in the temperature rise and humidity removal stage, the temperature maintaining stage and / or the low temperature rise rate stage after being communicated with the multiple heat exchangers connected in series or in parallel, the highest temperature provided by the high-temperature heat collector is recorded as T2, and T2 is larger than T1. By means of the technical scheme, the problem that in the prior art, solar energy cannot be efficiently used for providing heat supply for a baking system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of baking systems, and in particular to a temperature-variable solar baking room group, an energy storage method and a baking method. Background Art

[0002] In areas where the power grid is insufficient, the heat pump curing rooms used in tobacco-curing areas or curing other Chinese medicinal materials, tea, etc. are limited by the power of the power grid, and can only use coal-fired or biomass curing rooms, such as the mountainous areas of Yunnan, Guizhou, Sichuan, especially the mountainous areas of Yunnan, Xinjiang and Tibet. The main path to carbon peak and carbon neutrality is to replace coal with electricity, and to replace coal with clean energy to reduce emissions. Therefore, in order to reduce emissions, the use of solar heating is one of the common means.

[0003] At present, the utilization of solar thermal energy is generally based on a fixed temperature (a certain temperature fluctuation or change is allowed), such as a solar water heater with a hot water output temperature of 55-60°C, or a trough-type solar collector power generation with an output of about 300°C. However, in the baking process, in addition to the conventional heating stage, there is also a dehumidification stage with a higher temperature rise rate requirement. For example, the flue-cured tobacco process curve requires a temperature range of 36-68°C. During the dehumidification stage, a larger temperature rise rate is required when fresh air is introduced to meet the drying process requirements. At this time, not only the temperature rise amplitude but also the temperature rise rate must be met. The small temperature difference of normal heating is not enough to meet the temperature rise rate requirements of the large dehumidification stage, and solar energy cannot be efficiently used to provide heat supply for the baking system. Summary of the invention

[0004] The present invention proposes a variable temperature solar curing room group, an energy storage method and a curing method, which solves the problem in the prior art that solar energy cannot be efficiently utilized to provide heat supply for a curing system.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a variable temperature solar curing room group, comprising: A drying chamber, wherein the drying chamber has a plurality of operating stages, wherein the operating stages of the drying chamber include a temperature maintenance stage, a low temperature rise rate stage, and a temperature rise and dehumidification stage; Heat exchanger, each of the drying chambers is provided with a heat exchanger; A low-temperature heat collector, which is used to provide heat in the temperature maintenance stage and / or the low temperature rise rate stage after being connected to the heat exchanger. The highest temperature provided by the low-temperature heat collector is recorded as T1; A high-temperature collector is used to provide heat for the temperature rise and dehumidification stage, the temperature maintenance stage and / or the low temperature rise rate stage after being connected with multiple heat exchangers connected in series or in parallel. The highest temperature provided by the high-temperature collector is recorded as T2, and T2 is greater than T1.

[0006] Optionally, a heat storage tank is further included, which has an inner cylinder and an outer cylinder, the outer cylinder is sleeved on the outside of the inner cylinder, the outer cylinder is used to store the heat exchange medium of the low-temperature collector, and the low-temperature collector is connected to the heat exchanger through the outer cylinder; the inner cylinder is used to store the heat exchange medium of the high-temperature collector, and the high-temperature collector is connected to the heat exchanger through the inner cylinder.

[0007] Optionally, there are multiple heat storage tanks, and the inner cylinders of the multiple heat storage tanks are connected in parallel and communicated with the high-temperature collector, and the outer cylinders of the multiple heat storage tanks are connected in parallel and communicated with the high-temperature collector.

[0008] Optionally, it also includes: A heat storage regulating tank is provided with an inlet, the inlet is used to communicate with the inner cylinder, and the heat storage regulating tank is used to heat the heat transfer medium in the outer cylinder after heat exchange with the outer cylinder.

[0009] Optionally, a fan is provided in the drying chamber, and further comprises: A photovoltaic power generation device and an energy storage device, wherein the energy storage device is electrically connected to the fan, the pump body and the photovoltaic power generation device.

[0010] According to another aspect, at least one embodiment of the present disclosure further provides an energy storage method based on the above-mentioned variable temperature solar curing room group, comprising: The heat from the low-temperature collector heats the heat exchanger to provide heat for the temperature maintenance stage and / or low temperature rise rate of the drying chamber. The highest temperature provided by the low-temperature collector is recorded as T1. The heat from the high temperature collector heats the heat exchanger to provide heat for the drying room temperature rise and dehumidification stage, the temperature maintenance stage and / or the low temperature rise rate stage. The highest temperature provided by the high temperature collector is recorded as T2, which is greater than T1.

[0011] Optionally, a heat storage tank is further included, wherein the heat storage tank has an inner cylinder and an outer cylinder, and the outer cylinder is sleeved outside the inner cylinder; the energy storage method further includes the following steps: The low-temperature collector and the high-temperature collector collect heat energy simultaneously. The heat energy collected by the low-temperature collector is stored in the heat exchange medium of the outer tube, and the heat energy collected by the high-temperature collector is stored in the heat exchange medium of the inner tube.

[0012] Optionally, the heat exchange medium in the inner drum flows to the multiple heat exchangers connected in parallel to provide heat for the drying chamber in the temperature rise and dehumidification stage, and then continues to flow to the multiple heat exchangers connected in series to provide heat for the drying chamber in the temperature maintenance stage and / or the low temperature rise rate stage.

[0013] Optionally, when the energy output by the heat exchange medium of the outer drum is lower than the heat energy required for multiple drying chamber temperature maintenance stages, the energy stored in the heat exchange medium of the inner drum is transferred to the heat exchange medium in the outer drum, and after the temperature of the outer drum is lowered, the heat of the inner drum flows to the outer drum.

[0014] According to another aspect, at least one embodiment of the present disclosure further provides the variable temperature solar curing barn group for use in curing tobacco leaves, Chinese medicinal materials, fungi, and fruits.

[0015] According to another aspect, at least one embodiment of the present disclosure further provides a baking method based on the above-mentioned variable temperature solar baking room group, comprising the following steps: When the plurality of drying chambers are in the temperature maintenance stage and / or the low temperature rise rate stage, the heat of the low temperature collector heats the plurality of heat exchangers to maintain the baking temperature required by each of the drying chambers; When the plurality of drying chambers are in the temperature rise and moisture removal stage, the heat of the high temperature collector heats the plurality of heat exchangers to maintain the heat required by each of the drying chambers; The heat collected by the high-temperature collector flows through multiple heat exchangers in the temperature rise and dehumidification stage, and then continues to flow to the multiple series-connected drying chambers in the temperature maintenance stage and / or low temperature rise rate stage.

[0016] Optionally, each of the drying chambers is used to bake tobacco leaves, and the steps of baking the tobacco leaves include a yellowing period, a color fixing period and a dry tendon period, wherein the yellowing period, the color fixing period and the dry tendon period respectively include several low temperature rise rate stages, a temperature maintenance stage and / or a temperature rise and dehumidification stage. When the tobacco leaves in the drying chamber are in the color fixing period and / or the dry tendon period, the heat exchange medium in the heat exchanger flows in series to the heat exchanger of the drying chamber where the tobacco leaves are in the yellowing period.

[0017] The beneficial effects of the present invention are: In the present invention, a variety of output temperatures are constructed by using low-temperature collectors and high-temperature collectors. Based on the temperature requirements and temperature rise requirements of the drying room group at different stages, the solar energy is efficiently utilized and regulated, thereby reducing the total power configuration of the drying room group. The heat storage temperature gradient design of the inner and outer cylinders of the heat storage tank reduces the heat storage heat loss, and achieves multiple temperature output targets and a powerful ability to regulate temperature, thereby improving the thermal utilization efficiency of the system. The switching scheme of parallel and series heating matching the drying process is based on the different process stages and temperature and heat requirements of different drying rooms to achieve the purpose of regulating thermal energy and achieve energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0019] Figure 1 This is a schematic diagram of the structure of a baking room group of the present invention; Figure 2 It is a schematic diagram of the parallel structure of the heat exchanger of the drying chamber of the present invention; Figure 3 It is a schematic diagram of the series structure of the heat exchanger of the drying chamber of the present invention; Figure 4 It is a schematic diagram of the series-parallel switching structure of the heat exchanger in the drying chamber of the present invention; Figure 5 This is a schematic diagram of the parallel structure of heat storage tanks of the present invention; Figure 6 A schematic diagram of system connection in the energy storage method of the present invention; Figure 7 It is a schematic diagram of the process curve of the baking method of the present invention.

[0020] In the figure: 1. Drying room, 2. Heat exchanger, 3. Low-temperature collector, 4. High-temperature collector, 5. Heat storage tank, 6. Inner cylinder, 7. Outer cylinder, 8. Heat storage regulating tank, 9. Photovoltaic power generation device, 10. Energy storage device. DETAILED DESCRIPTION In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0021] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] Example 1 Reference Figure 1~Figure 5 , which is the first embodiment of the present invention, proposes a variable temperature solar curing room group. Figure 1 The drying room group is composed of a plurality of drying rooms 1, and the drying room 1 is provided with a fan, a dehumidification window, a tobacco beam and a tobacco rack or a stacked tobacco frame, and a temperature and humidity monitoring device. The fan is used to promote air circulation in the drying room, and the hot air in the drying room 1 is evenly distributed through forced ventilation to improve the drying efficiency. The dehumidification window is used to adjust the humidity in the drying room 1. The working stages of the drying room 1 include a temperature maintenance stage, a low temperature rise rate stage, and a temperature rise and dehumidification stage. The temperature rise and dehumidification stage requires a higher temperature rise rate than the temperature maintenance stage and the low temperature rise rate stage to meet the dehumidification requirements. This embodiment takes flue-cured tobacco as an example, and can also be applied to large-scale drying systems such as Chinese medicinal materials drying, tea drying, agricultural fungi, and fruits (red dates). At different stages of tobacco leaf baking, the humidity in the drying room can be adjusted by controlling the opening or opening and closing of the dehumidification window. The tobacco beam and tobacco rack or the stacked tobacco frame are used to fix the tobacco leaves so that the tobacco leaves can be neatly placed in the drying room 1, and the forced circulation of the fan facilitates the circulation of hot air and baking operations. The temperature and humidity monitoring device is a dry-bulb thermometer and a wet-bulb thermometer, which are used to monitor the dry-bulb temperature and wet-bulb temperature in the drying chamber 1. The dry-bulb temperature reflects the actual air temperature in the drying chamber, while the wet-bulb temperature reflects the humidity of the air. By monitoring the dry-bulb and wet-bulb temperatures, corresponding adjustments can be made according to the process requirements of tobacco leaf baking, such as adjusting the operating parameters of the heating system, ventilation system and other equipment.

[0025] Each drying chamber 1 is provided with a heat exchanger 2; the low-temperature collector 3 and the high-temperature collector 4 are used to provide the heat energy required by the heat exchanger 2, and the two send the heat energy into the drying chamber 1 through the heat exchanger 2. A low-temperature heat exchange medium, such as water or low-temperature heat transfer oil, circulates between the heat exchanger 2 and the low-temperature collector 3; a high-temperature heat exchange medium, such as high-temperature heat transfer oil, circulates between the heat exchanger 2 and the high-temperature collector 4. Among them, the low-temperature collector 3 is used to provide heat in the temperature maintenance stage after being connected to the heat exchanger 2, and the highest temperature provided by the low-temperature collector 3 is recorded as T1; the high-temperature collector 4 is used to provide heat in the temperature rise and dehumidification stage, and the highest temperature provided by the high-temperature collector 4 is recorded as T2, and T2 is greater than T1. In the flue-cured tobacco process, the required temperature range is 36-68°C, so the low-temperature collector 3 can use a vacuum tube or a flat-plate solar collector, and the maximum temperature provided can be selected as 90°C. In the temperature maintenance stage, there is a maximum temperature difference of about 50°C with the temperature range required by the drying chamber 1, which is sufficient to maintain conventional heating and temperature maintenance. During the dehumidification stage, due to the need for a larger temperature rise rate, the high-temperature collector can choose a trough collector, which provides a maximum temperature option of 160~180℃.

[0026] In this embodiment, when the drying chamber 1 is in the temperature maintenance stage, the low-temperature collector 3 works alone to transfer heat to the heat exchanger 2 to maintain the temperature in the drying chamber stable; when entering the temperature rise and dehumidification stage, the high-temperature collector 4 is started to provide higher heat for the drying chamber 1 to meet the dehumidification demand. By setting different types of low-temperature collectors 3 and high-temperature collectors 4, heat is provided for the temperature maintenance stage and the temperature rise and dehumidification stage respectively, so as to achieve accurate energy supply according to the heat demand of different baking stages, avoid the energy supply mismatch problem that may occur in different stages of a single collector, improve the utilization efficiency of solar energy, reduce the consumption of additional energy, reduce the cost of tobacco baking, and help to improve the stability of tobacco baking quality. According to the heat demand of the drying chamber 1, after flowing through the heat exchanger 2 of a drying chamber 1, the heat exchange medium can continue to flow to the heat exchanger 2 of the next drying chamber 1. Multi-level matching achieves the effect of multiple sources and multiple outputs, and the regulation ability is more powerful.

[0027] See also Figure 2 During the drying process, multiple heat exchangers 2 can be connected in parallel to the low-temperature collector 3 or the high-temperature collector 4 to meet the drying temperature requirements at different stages. Figure 3 Since the high-temperature collector 4 can provide higher temperature and heat, the heat exchange medium of the high-temperature collector 4 can choose to continue to enter the next drying chamber 1 that needs to be heated to continue heat exchange after flowing through a heat exchanger 2. The heat exchangers 2 of multiple drying chambers 1 can be connected in series to achieve step heating, realize the gradient release of thermal energy, and make full use of the heat in the high-temperature heat exchange medium heated by the high-temperature collector 4.

[0028] See also Figure 4, is a schematic diagram of the switching of multiple drying chambers 1 in series and in parallel in this embodiment. Figure 4 The dotted part in the figure is a series pipeline. For example, in the process of flue-curing tobacco, during the conventional temperature maintenance stage, the low-temperature collector 3 is used for heating, and the temperature reaches about 90°C, which is about 50°C different from the required maintenance temperature of 40°C, which is sufficient to maintain conventional heating and temperature maintenance. High-temperature collector 4 is used for high-power heating in the temperature rise and dehumidification stage, and the temperature is heated to about 160~180°C to meet the temperature rise rate requirements. In other process stages, heat storage tank 5 is used to release heat at 50-68°C. After heating, the heat exchange medium continues to enter the drying chamber 1 between 36-42°C for heating, realizing the gradient release of thermal energy and improving energy utilization efficiency. The series gradient of heat storage release is formed by using it. For the drying room group, since the drying room 1 has inconsistent start-up time, it is difficult to start baking at the same time for 50 (or 100, indicating a certain scale) drying rooms 1. Usually, the drying rooms are installed one by one, and then they are started one by one. This provides conditions for reducing the total power configuration of the drying room group. According to statistics, the power configuration of the drying room group only needs about 40%-50% of the power of multiple single drying rooms, and is configured according to 50% of the peak power of multiple drying rooms 1. For example, if there are 50 rooms and the single configuration is 40kW, the drying room group only needs to be configured with 1000kW, which is half of the original 2000kW configuration, greatly reducing the overall power of the drying room group. In view of the different temperature requirements and different temperature rise rate requirements between different drying rooms 1, the low-temperature collector 3 and the high-temperature collector 4 are used to provide two different temperatures, optimize the coupling of heat supply, realize the efficient supply of solar energy, and solve the problem of insufficient power supply in mountainous areas.

[0029] For further information, see Figure 1, and also includes a heat storage tank 5, which can store heat when there is sufficient sunlight, and continuously provide heat to the drying room 1 during periods of insufficient light or at night. The heat storage tank 5 is composed of an inner tube 6 and an outer tube 7. The outer tube 7 is sleeved on the outside of the inner tube 6 and is not connected. The outer tube 7 is used to store the heat exchange medium of the low-temperature collector 3, and the inner tube 6 is used to store the heat exchange medium of the high-temperature collector 4. The heat collected by the low-temperature collector 3 is transmitted to the heat exchange medium such as water in the outer tube 7 through a pipeline for storage, and then the outer tube 7 and the heat exchanger 2 establish a circulation loop to transfer the heat to the drying room 1. The high-temperature collector 4 stores the collected heat in the heat exchange medium such as heat exchange oil in the inner tube 6, and also supplies the heat to the drying room 1 through the connection between the inner tube 6 and the heat exchanger 2. For example, when there is sufficient sunlight during the day, the low-temperature collector 3 and the high-temperature collector 4 work simultaneously, storing heat in the outer cylinder 7 and the inner cylinder 6 of the heat storage tank 5 respectively. At night or when there is insufficient light, the heat in the heat storage tank 5 can be released to maintain the baking operation in the drying chamber 1. The structural design of the inner cylinder 6 and the outer cylinder 7 of the heat storage tank 5 realizes the classified storage of the heat collected by the low-temperature collector 3 and the high-temperature collector 4, and can better allocate heat according to the needs of the baking stage, thereby improving the stability and flexibility of heat storage and supply. On the one hand, it avoids energy loss and unstable supply caused by the mixing of high and low temperature heat; on the other hand, even in the period when solar energy is insufficiently collected, the heat reserve in the heat storage tank 5 can be relied on to maintain the baking process, further improving the efficiency of the entire system in utilizing solar energy and the continuity of tobacco baking operations, and reducing the baking system's dependence on the power system.

[0030] See also Figure 5 , there can be multiple heat storage tanks 5. When there are a large number of drying rooms 1 in the drying room group, multiple heat storage tanks 5 can be used in parallel to store more heat energy and meet the energy needs of the drying room group. The inner cylinders 6 of multiple heat storage tanks 5 are connected in parallel and connected to the high-temperature collector 4, and the outer cylinders 7 of multiple heat storage tanks 5 are connected in parallel and connected to the low-temperature collector 3. During operation, the heat collected by the high-temperature collector 4 can be evenly distributed to the inner cylinders 6 of each heat storage tank 5 for storage, and the heat collected by the low-temperature collector 3 can also be evenly distributed to the outer cylinders 7 of each heat storage tank 5. When a drying room 1 enters the temperature rise and dehumidification stage and requires high-temperature heat, the inner cylinders 6 of multiple heat storage tanks 5 can collaboratively provide sufficient high-temperature heat exchange medium; in the temperature maintenance stage, the outer cylinders 7 of multiple heat storage tanks 5 can also jointly maintain a stable low-temperature heat supply. For example, when faced with the complex demands of multiple drying rooms 1 at different baking stages, it is able to better balance heat distribution and avoid interruptions or insufficient heat supply caused by failure or insufficient capacity of a single heat storage tank 5, thereby improving the stability and fault tolerance of the entire electric drying room group, ensuring that tobacco baking operations can be carried out efficiently and stably, and at the same time, it is also beneficial to improve the overall efficiency of the solar energy collection and storage system.

[0031] Furthermore, it also includes a heat storage regulating tank 8, which has an inlet for communicating with the inner tube 6. The heat storage regulating tank 8 is used to heat the heat transfer medium in the outer tube 7 after heat exchange with the outer tube 7. When the ambient temperature is low due to the weather or the change of day and night, or when the outer tube 7 leaks temperature, the outer tube 7 is insufficient to provide the heat required by the drying chamber 1 in the heating stage, the outer tube 7 and the inner tube 6 can be connected through the heat storage regulating tank 8, and the heat stored in the inner tube 6 can flow to the outer tube 7 after being regulated by the heat storage regulating tank 8, thereby heating the heat exchange medium in the outer tube 7 to meet the heating demand of the drying chamber 1. Using the low-temperature heat exchange medium in the outer tube 7 to maintain the temperature for heating is more conducive to improving the heat transfer efficiency and reducing the heat loss. The specific operation is that by controlling the valve and the circulating pump, the high-temperature heat exchange medium in the inner tube 6 first flows into the heat storage regulating tank 8, and then flows back to the inner tube 6 after heat exchange with the heat exchange medium in the outer tube 7 in the heat storage regulating tank 8, thereby increasing the temperature of the outer tube 7 and ensuring the stability of the heat supply in the temperature maintenance stage. The setting of the heat storage regulating tank 8 effectively solves the problem of insufficient heat in the temperature maintenance stage caused by the temperature drop of the outer cylinder 7 during the long-term heat supply process. By using the high-temperature heat of the inner cylinder 6 for regulation, the internal circulation of high and low temperature heat is realized, the energy utilization efficiency of the entire heat storage system is improved, the frequency of starting auxiliary heating equipment due to insufficient heat supplement is reduced, energy consumption and operating costs are reduced, and the stability and reliability of the temperature maintenance stage during the tobacco leaf baking process are guaranteed, which is conducive to improving the consistency of tobacco leaf baking quality.

[0032] For further information, see Figure 1 , and also includes a photovoltaic power generation device 9 and an energy storage device 10. The photovoltaic power generation device 9 can directly convert solar energy into electrical energy and store it in the energy storage device 10. The energy storage device 10 can select energy storage batteries, energy storage inverters, super capacitors, etc. For example, the energy storage battery can be a lead-acid battery, a lithium-ion battery, a nickel-hydrogen battery, etc. A fan is provided in the drying room 1, and a circulating pump (not shown in the drawings) can be provided between the heater 2 and the heat storage tank 5. The energy storage device 10 is electrically connected to the fan, the pump body and the photovoltaic power generation device 9 to supply power to the fan and the pump body. A photovoltaic power generation device 9 is set near the electric baking room group. Polycrystalline silicon solar panels can be used. The total installed capacity is selected according to the scale of the baking room group. The generated electrical energy is transmitted through a controller and stored in the energy storage device 10. The energy storage device 10 can select lithium iron phosphate batteries. The fan, the pump body, the energy storage device 10 and the photovoltaic power generation device 9 are connected through an electrical control system. During the day when there is sufficient sunlight, the electricity generated by the photovoltaic power generation device 9 is directly used to supply the fan and pump body for operation, and the excess electricity is stored in the energy storage device 10; at night or when there is insufficient light, the energy storage device 10 releases electricity to drive the fan and pump body to work, ensuring the normal circulation of air and heat exchange medium in the drying chamber 1, and maintaining the continuous stability of the tobacco baking operation.

[0033] The combination of the photovoltaic power generation device 9 and the energy storage device 10 realizes the self-sufficiency of electricity in the electric drying room group. By making full use of solar power generation to drive equipment such as fans and pumps, the dependence on the external power grid is reduced, and the electricity bill expenditure is reduced. At the same time, the setting of the energy storage device 10 ensures the normal operation of the equipment during periods of no light or insufficient light, improves the stability and reliability of the operation of the entire electric drying room group, and makes the tobacco leaf baking operation unaffected by fluctuations in the power supply, which is conducive to improving the quality and efficiency of tobacco leaf baking, and to a certain extent reduces the operating cost and environmental impact of the entire system.

[0034] Example 2 Reference Figure 6 , which is the second embodiment of the present invention, and this embodiment provides an energy storage method, comprising the following steps: the heat of the low-temperature collector 3 heats the heat exchanger 2 to provide heat to the drying chamber 1 in the temperature maintenance stage and the low temperature rise rate stage, and the highest temperature provided by the low-temperature collector 3 is recorded as T1; the heat of the high-temperature collector 4 heats the heat exchanger 2 to provide heat to the drying chamber 1 in the temperature rise and dehumidification stage, the low temperature rise rate stage and / or the temperature maintenance stage, and the highest temperature provided by the high-temperature collector 4 is recorded as T2, and T2 is greater than T1. The energy stored in this energy storage method is stored in a heat storage tank 5, and the heat storage tank 5 has an inner tube 6 and an outer tube 7, and the outer tube 7 is sleeved on the outer side of the inner tube 6; the low-temperature collector 3 and the high-temperature collector 4 collect heat energy at the same time, and the heat energy collected by the low-temperature collector 3 is stored in the heat exchange medium of the outer tube 7, and the heat energy collected by the high-temperature collector 4 is stored in the heat exchange medium of the inner tube 6.

[0035] Furthermore, after the heat exchange medium in the inner cylinder 6 flows to the multiple parallel heat exchangers 2 to provide heat for the drying chamber 1 in the temperature rise and dehumidification stage, it continues to flow to the multiple series heat exchangers 2 to provide heat for the temperature maintenance stage and the low temperature rise rate stage for the drying chamber 1. When the energy output by the heat exchange medium in the outer cylinder 7 is lower than the heat energy required for the temperature maintenance stage of the multiple drying chambers 1, the energy stored in the heat exchange medium in the inner cylinder 6 is transferred to the heat exchange medium in the outer cylinder 7; after the temperature of the outer cylinder 7 is reduced, the heat of the inner cylinder 6 flows to the outer cylinder 7.

[0036] In this embodiment, when there is sufficient sunlight, the low-temperature collector 3 and the high-temperature collector 4 are turned on and work at the same time. The low-temperature collector 3 adopts a tube-sheet structure, and its heat absorption coating is a selective absorption coating. The outer cylinder 7 stores a low-temperature heat exchange medium. The collected heat is transmitted to the outer cylinder 7 of the heat storage tank 5 through a circulation pipeline, so that the temperature of the low-temperature heat exchange medium in the outer cylinder 7 gradually increases, and heat storage is achieved. The high-temperature collector 4 can adopt a trough collector with efficient heat collection performance. The inner cylinder 6 stores a high-temperature heat exchange medium. The collected heat is stored in the heat exchange medium of the inner cylinder 6 of the heat storage tank 5, and sufficient heat is reserved for the subsequent tobacco leaf baking process.

[0037] The low-temperature collector 3 and the high-temperature collector 4 collect heat energy at the same time and store it in the outer cylinder 7 and the inner cylinder 6 of the heat storage tank 5 respectively. This parallel heat collection and storage method can make full use of solar energy resources in different temperature ranges. It improves the efficiency of solar energy collection, ensures sufficient heat supply at appropriate temperatures in different baking stages, reduces the need for additional energy due to insufficient heat, reduces energy consumption, improves the sustainability and economy of tobacco leaf baking operations, and is conducive to improving the energy utilization efficiency and operating stability of the entire electric baking room group. At the same time, the outer cylinder 7 can also provide insulation for the inner cylinder 6 to reduce the loss of stored heat.

[0038] The number of heat storage tanks 5 is adjusted according to the number of drying rooms 1 in the drying room group, and multiple heat storage tanks 5 can be set as needed. The inner cylinders 6 of multiple heat storage tanks 5 are connected to the high-temperature collector 4 through parallel pipes, and a flow regulating valve is installed on the pipe to control the heat distribution. Similarly, the outer cylinders 7 of multiple heat storage tanks 5 are connected to the low-temperature collector 3 through parallel insulation pipes. During operation, the heat collected by the high-temperature collector 4 can be evenly distributed to the inner cylinders 6 of each heat storage tank 5, and the heat collected by the low-temperature collector 3 can also be evenly distributed to the outer cylinders 7 of each heat storage tank 5. For example, when the high-temperature collector 4 collects more heat in a certain period of time, the temperature of the high-temperature heat transfer oil in each inner cylinder 6 can be adjusted by the flow regulating valve to make the temperature rise more evenly, avoiding local overheating or uneven heat distribution; similarly, the low-temperature heat transfer oil / water in the outer cylinder 7 can also be evenly stored. The uniformity and reliability of heat collection and storage are improved. It can better cope with the changes in solar radiation intensity at different time periods, ensure that each heat storage tank 5 can fully collect and store heat, and avoid the problem of insufficient heat or overload of some heat storage tanks due to unreasonable connection methods. During the baking process, whether it is the dehumidification stage of high temperature demand or the temperature maintenance stage of low temperature demand, it can stably obtain appropriate heat from each heat storage tank 5, which improves the operating efficiency of the entire electric baking room group and the stability of tobacco baking quality, and is also beneficial to extend the service life of the heat storage tank 5 and the collector. The use of the inner cylinder 6 and the outer cylinder 7 in conjunction with the high-temperature collector 4 and the low-temperature collector 3 adopts multi-source heating and adapts to the heat use of multi-stage baking rooms. The heating direction and target are clear, which is conducive to improving the efficiency of heat utilization. In the process of using multiple baking rooms, the heat supply can also be optimized according to different stages and different temperatures, and the optimization ability of heat allocation matching the baking process is stronger.

[0039] When the temperature of the outer cylinder 7 of the heat storage tank 5 decreases at night or due to continuous cloudy days, and cannot meet the heat demand in the temperature maintenance stage, the high-temperature heat exchange medium in the inner cylinder 6 exchanges heat with the low-temperature heat exchange medium in the outer cylinder 7 through a circulating pump. For example, when the temperature of the low-temperature heat exchange medium / water in the outer cylinder 7 drops below 70°C, after a period of heat exchange, the temperature of the low-temperature heat exchange medium / water in the outer cylinder 7 can rise to about 90°C, thereby ensuring the heat supply of the drying chamber 1 in the temperature maintenance stage and maintaining the normal progress of the tobacco baking process. The effective allocation and internal recycling of high and low temperature heat are achieved. The flexibility and stability of the entire heat storage system are improved, the baking interruption or quality degradation caused by insufficient heat in the outer cylinder 7 is avoided, the need for external energy supplementation is reduced, the operating cost is reduced, the continuity and stability of the tobacco baking operation under different environmental conditions are guaranteed, and it is beneficial to improve the economic benefits and product quality of tobacco baking.

[0040] Example 3 Reference Figure 7 , which is the third embodiment of the present invention, this embodiment provides a baking method, comprising the following steps: when multiple drying chambers 1 are in the temperature maintenance stage and / or the low temperature rise rate stage, the heat of the low temperature collector 3 heats the multiple heat exchangers 2 to maintain the baking temperature required by each drying chamber 1; when multiple drying chambers 1 are in the temperature rise and dehumidification stage, the heat of the high temperature collector 4 heats the multiple heat exchangers 2 to maintain the heat required by each drying chamber 1; the heat collected by the high temperature collector 4 flows through the multiple heat exchangers 2 in the temperature rise and dehumidification stage, and then continues to flow to the multiple drying chambers 1 connected in series in the temperature maintenance stage and / or the low temperature rise rate stage.

[0041] Each drying chamber 1 is used to bake tobacco leaves. The steps of baking tobacco leaves include yellowing stage, coloring stage and dry-stem stage. The baking degree of tobacco leaves in each drying chamber 1 is different, and they are independently in the yellowing stage, coloring stage or dry-stem stage. The yellowing stage, coloring stage and dry-stem stage respectively include several low temperature rise rate stages, temperature maintenance stages and / or temperature rise and dehumidification stages, so that the drying chamber 1 finally reaches the required temperature. The specific steps include: S1, yellowing period: the dehumidification window is closed, the low temperature collector 3 is connected to the heat exchanger 2, the dehumidification window is opened, and the high temperature collector 4 is connected to the heat exchanger 2. The dehumidification window is opened, and the dry bulb temperature of the drying chamber 1 is raised to 36-38°C, and the wet bulb temperature is raised to 36-37°C, until the tobacco leaves turn yellow and the veins turn blue, and the main leaves become soft; S2, color fixing period: the dehumidification window is closed, the low-temperature collector 3 is connected to the heat exchanger 2, so that the dry-bulb temperature of the drying chamber 1 is maintained at 36-38°C, and the wet-bulb temperature is maintained at 36-37°C. The dehumidification window is opened, the high-temperature collector 4 is connected to the heat exchanger 2, and dehumidification is performed, so that the dry-bulb temperature of the drying chamber 1 is raised to 46-48°C, and the wet-bulb temperature is raised to 38-40°C. The dehumidification window is closed again, and the low-temperature collector 3 is connected to the heat exchanger 2, so that the dry-bulb temperature of the drying chamber 1 is raised to 54-55°C and maintained, and the wet-bulb temperature is still 38-40°C, until the leaves are completely dry; S3, dry rib period: the low-temperature collector 3 is connected to the heat exchanger 2 to raise the dry-bulb temperature to 65-68°C, and at the same time, the wet-bulb temperature is controlled at 42-43°C until the tobacco ribs are dried and the leaves are dry.

[0042] Furthermore, in step S2 and step S3, when the temperature in the drying chamber 1 is in the range of 50-68°C, the heat exchange medium in the heat exchanger 2 flows in series to the heat exchanger 2 of the drying chamber 1 which is in the yellowing period in step S1.

[0043] In this embodiment, when drying tobacco leaves, the yellowing period is first entered. After the tobacco clips are neatly placed in the drying chamber 1, the dehumidification window is closed. The outer cylinder 7 of the heat storage tank 5 is connected to the heat exchanger 2 by controlling the valve, and the fan is started to circulate the hot air in the drying chamber 1, slowly raising the temperature to 36-38°C, and the temperature is stabilized at this temperature for about 35 hours. At this time, the tobacco leaves gradually turn yellow and the main leaves begin to soften. Dehumidification can be carried out in the yellowing period. If dehumidification is carried out in the yellowing period, the dehumidification window needs to be opened, and the high-temperature collector 4 is connected to the heat exchanger 2 to meet the heat demand of the dehumidification stage of the drying chamber 1. Then enter the color fixing period, switch the valve to connect the outer cylinder 7 with the heat exchanger 2, and maintain the temperature of the drying chamber 1 at 36-38°C to prepare for large dehumidification. Then open the dehumidification window, and adjust the fan speed and the opening of the dehumidification window to stabilize the wet bulb temperature at 38-40°C, and stabilize the temperature for about 19 hours until the leaves are completely dry. Finally, it enters the tobacco rib drying stage, and switches back to the outer cylinder 7 to connect with the heat exchanger 2. The dry bulb temperature is raised to 65-68°C at a heating rate of 0.8-1.2°C / H. The wet bulb temperature is maintained at 42-43°C by controlling the air intake and moisture removal. The temperature is kept stable for about 22 hours until the tobacco ribs are dried and the leaves are dried, completing the entire tobacco leaf baking process. Usually, when the temperature in the drying chamber 1 needs to be maintained at a higher level in the late tobacco rib drying stage, or when moisture removal is required according to the actual baking conditions, the heat exchanger 2 can also be connected to the high-temperature collector 4. During the tobacco leaf baking process, the temperature and humidity in the drying chamber 1 and the baking time of each period need to be adjusted according to the region where the drying chamber is located, the variety and different parts of the tobacco leaves, and are not limited to the data listed in this embodiment.

[0044] According to the different stages of tobacco leaf baking, namely the yellowing period, coloring period and tendon drying period, the connection between the inner cylinder 6 and the outer cylinder 7 of the heat storage tank 5 and the heat exchanger 2 is switched appropriately to accurately control the temperature and humidity, thus realizing the refined management of the tobacco leaf baking process. In the yellowing period, the low-temperature heat of the outer cylinder 7 is used to slowly turn the tobacco leaves yellow, thus avoiding the degradation of tobacco leaf quality due to excessive temperature; in the coloring period, the high-temperature heat of the inner cylinder 6 is used to quickly remove moisture and fix the color, thus improving production efficiency; in the tendon drying period, the heat is switched back to the relatively low-temperature heat of the outer cylinder 7 to dry the tobacco tendons, thus reducing energy waste. This baking method improves the quality and efficiency of tobacco leaf baking, makes full use of solar energy resources, reduces energy consumption and operating costs, and is conducive to improving the commercial value and economic benefits of tobacco leaves.

[0045] When the temperature in the drying room 1 is in the range of 50-68°C, i.e., the color fixing period or the tendon drying period, the heat exchange medium in the heat exchanger 2 of the drying room 1 in this temperature range is connected in series through a pipeline to the heat exchanger 2 of other drying rooms 1 in the yellowing period. For example, there are three drying rooms 1, of which drying room 1 No. 1 is in the color fixing period, and drying rooms 1 No. 2 and No. 3 are in the yellowing period. During the color fixing process of drying room 1 No. 1, the high-temperature heat exchange medium in its heat exchanger 2 flows into the heat exchanger 2 of drying room 1 No. 2 after flowing out, and then passes through the heat exchanger 2 of drying room 2 to the heat exchanger 2 of drying room 3, realizing multi-stage utilization of heat.

[0046] When the temperature of drying room 1 is between 50 and 68°C, the heat exchange medium in heat exchanger 2 is connected in series to heat exchanger 2 of drying room 1 in the yellowing period, realizing the step-by-step utilization of heat. The energy utilization efficiency of the entire electric drying room group is improved, the heat waste is reduced, and the energy consumption is reduced. Under the premise of not affecting the normal baking process of each drying room 1, the waste heat of the higher temperature in the coloring period is fully utilized to provide additional heat supplement for the drying room 1 in the yellowing period, further reducing the operating cost and improving the economy and environmental protection of the electric drying room group.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Variable temperature solar curing room group, characterized by: include: A drying chamber (1), the drying chamber (1) having a plurality of operating stages, the operating stages of the drying chamber (1) comprising a temperature maintenance stage, a low temperature rise rate stage and a temperature rise and dehumidification stage; A heat exchanger (2), each drying chamber (1) being provided with a heat exchanger (2); A low-temperature heat collector (3), the low-temperature heat collector (3) being used to provide heat in the temperature maintenance stage and / or the low temperature rise rate stage after being connected to the heat exchanger (2), the highest temperature provided by the low-temperature heat collector (3) being recorded as T1; A high-temperature heat collector (4), the high-temperature heat collector (4) being used to provide heat for the temperature rise and dehumidification stage, the temperature maintenance stage and / or the low temperature rise rate stage after being connected to the plurality of heat exchangers (2) connected in series or in parallel, the highest temperature provided by the high-temperature heat collector (4) being recorded as T2, and T2 being greater than T1.

2. The variable temperature solar curing room group according to claim 1 is characterized in that: The heat storage tank (5) further comprises an inner cylinder (6) and an outer cylinder (7), wherein the outer cylinder (7) is sleeved on the outside of the inner cylinder (6), the outer cylinder (7) is used to store the heat exchange medium of the low-temperature heat collector (3), and the low-temperature heat collector (3) is connected to the heat exchanger (2) through the outer cylinder (7); the inner cylinder (6) is used to store the heat exchange medium of the high-temperature heat collector (4), and the high-temperature heat collector (4) is connected to the heat exchanger (2) through the inner cylinder (6).

3. The variable temperature solar curing room group according to claim 2 is characterized in that: The heat storage tank (5) comprises a plurality of inner cylinders (6) of the plurality of heat storage tanks (5) connected in parallel and connected to the high-temperature heat collector (4), and the outer cylinders (7) of the plurality of heat storage tanks (5) connected in parallel and connected to the low-temperature heat collector (3).

4. The variable temperature solar curing room group according to claim 2 is characterized in that: Also includes: A heat storage regulating tank (8), the heat storage regulating tank (8) having an inlet, the inlet being used to communicate with the inner cylinder (6), the heat storage regulating tank (8) being used to heat the heat transfer medium in the outer cylinder (7) after heat exchange with the outer cylinder (7).

5. The variable temperature solar curing barn group according to any one of claims 1 to 4, characterized in that: The drying chamber (1) is provided with a fan, and further comprises: A photovoltaic power generation device (9) and an energy storage device (10), wherein the energy storage device (10) is electrically connected to the wind turbine and the photovoltaic power generation device (9).

6. The energy storage method for the variable temperature solar curing barn group according to any one of claims 1 to 5, characterized in that: The energy storage method comprises the following steps: The heat of the low-temperature heat collector (3) heats the heat exchanger (2) to provide heat to the drying chamber (1) during the temperature maintenance phase and / or the low temperature rise rate phase, wherein the highest temperature provided by the low-temperature heat collector (3) is recorded as T1; The heat of the high-temperature heat collector (4) heats the heat exchanger (2) to provide heat to the drying chamber (1) during the temperature rise and dehumidification stage, the temperature maintenance stage and / or the low temperature rise rate stage. The highest temperature provided by the high-temperature heat collector (4) is recorded as T2, and T2 is greater than T1.

7. The energy storage method according to claim 6, characterized in that: It also comprises a heat storage tank (5), the heat storage tank (5) comprising an inner cylinder (6) and an outer cylinder (7), the outer cylinder (7) being sleeved on the outside of the inner cylinder (6); the energy storage method further comprises the following steps: The low-temperature heat collector (3) and the high-temperature heat collector (4) collect heat energy simultaneously; the heat energy collected by the low-temperature heat collector (3) is stored in the heat exchange medium of the outer tube (7), and the heat energy collected by the high-temperature heat collector (4) is stored in the heat exchange medium of the inner tube (6).

8. The energy storage method according to claim 7, characterized in that: After the heat exchange medium in the inner cylinder (6) flows to the multiple heat exchangers (2) connected in parallel to provide heat for the drying chamber (1) in the temperature rise and dehumidification stage, it continues to flow to the multiple heat exchangers (2) connected in series to provide heat for the drying chamber (1) in the temperature maintenance stage and / or the low temperature rise rate stage.

9. The energy storage method according to claim 7, characterized in that: When the energy output by the heat exchange medium in the outer cylinder (7) is lower than the heat energy required for the temperature maintenance stage and / or the low temperature rise rate stage of the plurality of drying chambers (1), the energy stored in the heat exchange medium in the inner cylinder (6) is transferred to the heat exchange medium in the outer cylinder (7), and after the temperature of the outer cylinder (7) is lowered, the heat in the inner cylinder (6) flows to the outer cylinder (7).

10. The variable temperature solar curing barn group according to any one of claims 1 to 5 is used for curing tobacco leaves, Chinese medicinal materials, fungi, and fruits.

11. A baking method based on a variable temperature solar baking room group according to any one of claims 1 to 5, characterized in that: When the plurality of drying chambers (1) are in the temperature maintenance stage and / or the low temperature rise rate stage, the heat of the low temperature heat collector (3) heats the plurality of heat exchangers (2) to maintain the baking temperature required by each of the drying chambers (1); When the plurality of drying chambers (1) are in the temperature rise and moisture removal stage, the heat of the high-temperature heat collector (4) heats the plurality of heat exchangers (2) to maintain the heat required by each of the drying chambers (1); The heat collected by the high-temperature heat collector (4) flows through a plurality of heat exchangers (2) in the temperature rise and dehumidification stage, and then continues to flow to a plurality of drying chambers (1) in series that are in the temperature maintenance stage and / or the low temperature rise rate stage.

12. The baking method according to claim 11, characterized in that: Each of the drying chambers (1) is used for drying tobacco leaves, and the steps of drying tobacco leaves include a yellowing stage, a coloring stage and a dry-stem stage, wherein the yellowing stage, the coloring stage and the dry-stem stage respectively include a plurality of low temperature rise rate stages, a temperature maintenance stage and / or a temperature rise and dehumidification stage. When the tobacco leaves in the drying chamber (1) are in the coloring stage and / or the dry-stem stage, the heat exchange medium in the heat exchanger (2) flows in series to the heat exchanger (2) of the drying chamber (1) where the tobacco leaves are in the yellowing stage.

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