Baihao silver needle tea alcoholization fresh-keeping method

Abstract

The invention discloses a Baihao silver needle tea alcoholization fresh-keeping method which comprises the following steps: inputting tea leaves into a dual-heat-energy baking machine for re-baking and aroma enhancement, drying the tea leaves by the dual-heat-energy baking machine by adopting two heat sources of electromagnetic heating and hot air, and putting the tea leaves subjected to re-baking and aroma enhancement into a container for temperature-controlled humidity-controlled oxygenation alcoholization, the alcoholized tea leaves are loaded into bamboo charcoal fiber boxes, then the packaged bamboo charcoal fiber boxes are stacked into a container, the container is vacuumized, and the tea leaves are stored in a fresh-keeping mode in a vacuum environment. By means of the method and equipment improvement involved in the method, the Baihao silver needle tea alcoholization efficiency and quality can be improved, storage and fresh keeping are convenient, and the method can be widely applied to the field of Baihao silver needle tea alcoholization storage.

Description

Technical Field

[0001] This invention relates to the field of tea processing technology, and in particular to a method for aging and preserving Baihao Yinzhen tea. Background Technology

[0002] The existing storage methods for Baihao Yinzhen tea are as follows: Finished white tea is packed into plastic bags and aluminum foil bags, then placed in corrugated cardboard boxes and naturally stored in a general warehouse for 3-5 years until the astringent taste fades and the aroma becomes sweet; alternatively, finished white tea is packed into plastic bags and aluminum foil bags and stored in a cold storage at 8-10℃ for preservation. Because the aging process of finished white tea is a complex oxidation reaction, it requires not only good temperature, humidity, and a sterile environment, but also an appropriate amount of oxygen to activate polyphenol oxidase, producing oxidation, polymerization, and degradation reactions. This process transforms the tea into a large amount of tea polysaccharides, amino acids, polyphenolic complexes, and aromatic substances, resulting in a unique quality and style characterized by a silvery appearance, a clear and bright tea soup, a fresh, mellow, and sweet taste, and a prominent honey and floral aroma. However, existing methods of storing finished white tea in plastic bags, aluminum foil bags, or corrugated boxes in general warehouses or cold storage for preservation suffer from several drawbacks. Plastic and aluminum foil bags are sealed, making it difficult for oxygen to enter and activate tea polyphenol oxidase for oxidation, polymerization, and degradation reactions. Furthermore, the significant temperature and humidity variations in general warehouses throughout the four seasons fail to create a suitable temperature- and humidity-controlled, sterile storage environment for the oxidation and aging process of finished white tea. The low temperatures in cold storage also inhibit polyphenol oxidase activity, hindering efficient oxidation, polymerization, and degradation reactions. In summary, existing warehouse equipment and methods suffer from several problems: difficulty in activating polyphenol oxidase, long storage and aging times, susceptibility to microbial contamination and quality control, and the risk of dampness and reduced aroma in cold storage. Therefore, there is a need to develop new storage equipment and aging methods for Baihao Yinzhen tea to improve aging efficiency and quality. Summary of the Invention

[0003] The purpose of this invention is to provide a method for the aging and preservation of Baihao Yinzhen tea, which solves the problems of low efficiency and difficulty in quality control in existing Baihao Yinzhen tea aging methods.

[0004] The technical solution adopted by this invention to solve its technical problem is: a method for aging and preserving Baihao Yinzhen tea, including re-drying and aroma enhancement → container oxygenation aging → bamboo charcoal fiber box packaging → vacuum preservation.

[0005] To ensure the tea remains dry during aging and prevent excessive moisture from causing mold growth, a dual-heat roasting machine is used for re-roasting and aroma enhancement. This machine utilizes electromagnetic radiation heat to penetrate deep into the cell layers, drying out any remaining moisture and enhancing the aroma. Simultaneously, air-source heat pumps dry the surface moisture and remove any raw or astringent taste. The tea is then aged in a temperature- and humidity-controlled, sterile, and oxygen-rich container. This allows the polyphenol oxidases in the white tea to undergo efficient oxidation, polymerization, and degradation reactions in a suitable temperature, humidity, and oxygen-rich environment, accelerating the aging process and shortening the aging time.

[0006] The dual-heat roasting machine includes a roasting tank, an electromagnetic device that provides electromagnetic radiation heat to the tea leaves inside the tank is installed at the bottom of the roasting tank, an air-source heat pump that blows air into the tank is installed at the feeding end of the roasting tank, and a temperature and humidity detection device is also installed inside the roasting tank.

[0007] To prevent the downy hairs in Baihao Yinzhen tea buds from easily sticking to the pan, breaking, and charring during the roasting process, thus producing a smoky and burnt taste and affecting product quality, a ceramic material is used for the inner wall of the roasting tank for re-drying to enhance aroma. The smooth, non-stick, and slow-heat-conducting characteristics of the ceramic inner wall can solve the problem of tea hairs breaking, sticking, and charring.

[0008] To continuously turn the tea leaves and improve the uniformity of drying, 4-5 turning devices are installed at intervals of 0.5-0.7m inside the roasting tank. The turning devices are preferably made of pine wood with a serrated structure, so as to intermittently turn the tea leaves in the tank so that they are evenly roasted by electromagnetic and hot air.

[0009] To create a favorable environment for the aging process of Baihao Yinzhen tea, the tea is stored in a container equipped with temperature control, dehumidification, and oxygen supply functions. The container's double-layered aluminum alloy outer wall and glass flake anti-corrosion paint insulation layer prevent high-temperature and cold-humid air from entering the container and also prevent the heat inside the container from escaping outwards, thus enabling constant-temperature storage and aging. At the same time, the configured dehumidification and vacuuming device removes moisture from the container and creates a vacuum, allowing the Baihao Yinzhen tea to undergo a humidity-controlled aging process and be preserved under vacuum.

[0010] To ensure that the stored Baihao Yinzhen tea has sufficient oxygen for oxidation, the primary oxygen supply device in the container can slowly release oxygen with a purity of over 90% into the container through the oxygen-enriched layer. This continuous oxygen supply replenishes the oxygen consumed during aging, stimulates the activity of polyphenol oxidase, and enhances the aging reaction of the Baihao Yinzhen tea in the container. This process transforms a large amount of tea polysaccharides, amino acids, polyphenolic compounds, and aromatic substances, resulting in the tea's characteristic silvery appearance, clear and bright tea soup, fresh, mellow, and sweet taste, and prominent honey and floral aroma.

[0011] To address the challenges of quality control in existing Baihao Yinzhen tea storage facilities, and the fact that low-temperature cold storage inhibits polyphenol oxidase activity, hindering efficient oxidation, polymerization, and degradation reactions, containers of Baihao Yinzhen tea are being stored in an intelligent tea warehouse. This warehouse features intelligent, programmed temperature control, humidity dehumidification, sterility, and drying capabilities, overcoming some technical limitations of existing Baihao Yinzhen tea storage equipment and thus effectively controlling the quality of stored Baihao Yinzhen tea products.

[0012] To terminate the oxidation reaction and ensure optimal freshness of Baihao Yinzhen tea after the aging process, the aged tea leaves are placed in a bamboo charcoal fiber box. This box has 80-100 mesh laser micropores and is lined with a layer of dried bamboo leaves. The Baihao Yinzhen tea is wrapped within these leaves, leveraging the environmentally friendly and pollution-free nature of the bamboo charcoal fiber box and the preservative properties of the dried bamboo leaves to enhance the tea's freshness. The bamboo charcoal fiber box is then placed inside a shipping container, and the container's vacuum system removes all air, achieving constant temperature and humidity control for vacuum preservation. This constant temperature and humidity control vacuum preservation process not only maintains the unique silvery color, clear and bright tea liquor, fresh, mellow, and sweet taste with a prominent honey and floral aroma of Baihao Yinzhen tea, but also solves the problems of moisture absorption and diminished aroma associated with existing low-temperature refrigerated Baihao Yinzhen tea.

[0013] The beneficial effects of this invention are as follows: This invention, through processes such as re-drying for aroma enhancement, containerized oxygenation aging, bamboo charcoal fiber box packaging, and vacuum preservation, can greatly improve the efficiency of aging, ensure the good quality of aged Baihao Yinzhen tea, and solve the problems of low efficiency and difficulty in quality control in existing Baihao Yinzhen tea aging methods. The re-drying for aroma enhancement employs both electromagnetic and hot air drying methods. Electromagnetic drying technology removes internal moisture in a timely manner, while hot air dries the surface moisture of the tea leaves, thereby improving drying efficiency. Simultaneously, electromagnetic drying enhances the aroma of the tea, while hot air removes residual astringent and off-flavors from the tea surface. The aging of Baihao Yinzhen tea within a container, due to its small size, allows for precise control of temperature, humidity, and oxygen supply, ensuring a stable aging environment and accelerating the aging process. Furthermore, oxygenation stimulates polyphenol oxidase activity, converting a large amount of tea polysaccharides, amino acids, polyphenolic compounds, and aromatic substances, resulting in a silvery appearance, clear and bright tea soup, a fresh, mellow, and sweet taste, and a prominent honey and floral aroma. Typically, storing Baihao Yinzhen tea in a container for one year achieves the same aging effect as traditional storage methods that require 2-3 years. Packaging Baihao Yinzhen tea in bamboo charcoal fiber boxes and then vacuum-sealing it within the container helps maintain its fresh and crisp quality after aging. Placing the container in a smart tea storage warehouse further ensures a good storage environment, protecting it from bacteria and extending its shelf life.

[0014] The present invention will now be described in more detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the steps of the method of the present invention.

[0016] Figure 2 This is a front view of the dual-heat baking machine of the present invention.

[0017] Figure 3 This is a side view of the dual-heat baking machine of the present invention.

[0018] Figure 4 This is a top view of the container in this invention.

[0019] Figure 5 In this invention Figure 4 A magnified view of part A.

[0020] Figure 6 This is the front view of the container in this invention.

[0021] Figure 7 This is the front view of the intelligent tea storage warehouse in this invention.

[0022] Figure 8 This is a top view of the intelligent tea storage warehouse in this invention. Detailed Implementation

[0023] Examples, such as Figures 1 to 8 As shown, a method for aging and preserving Baihao Yinzhen tea includes the following steps: 1) Re-drying and aroma enhancement: The tea leaves are fed into a dual-heat energy roasting machine for re-drying and aroma enhancement. The dual-heat energy roasting machine uses both electromagnetic heating and hot air as heat sources to dry the tea leaves. The settings are: leaf thickness of 8-10 cm, electromagnetic temperature of 75-80°C, hot air temperature of 50-55°C, re-drying time of 10-15 min, and moisture content after re-drying is controlled between 4.5-5.5%. The dual-heat-energy roasting machine includes a roasting tank, an electromagnetic device, a second air-source heat pump, and a temperature and humidity detection device. Features of this machine: The roasting tank is made of stainless steel on both sides, and the bottom of the tank has a double-layer structure; the outer wall is made of aluminum-titanium alloy composite material, and the inner wall is made of ceramic material. It re-roasts and enhances the aroma of Baihao Yinzhen tea through the coordinated action of electromagnetic heat energy, hot air heat energy, and the temperature and humidity detection device. The technical effects of the dual-heat-energy intelligent re-roasting and aroma-enhancing process using electromagnetic radiation heat energy penetrates deep into the Baihao Yinzhen tea, causing the internal moisture to seep out. Then, the air-source heat pump dries the surface moisture and removes residual astringency, accelerating the drying process. Simultaneously, electromagnetic radiation enhances the aroma of the tea. Furthermore, the ceramic material at the bottom of the roasting tank solves the problem of the buds and hairs of Baihao Yinzhen tea easily sticking to the pan and charring during re-roasting, affecting its quality.

[0024] 2) Containerized Oxygen-Enriched Aging: The re-dried and aroma-enhanced tea leaves are placed in a container for temperature- and humidity-controlled oxygen-enriched aging. The settings are: aging temperature controlled between 22-26℃, aging humidity maintained between 30-40%, and negative oxygen ion content maintained at 48,000-50,000 / cm³. 3 The aging time is 350-360 days. The container has temperature, humidity, and oxygen supply functions to ensure the required temperature, humidity, and oxygen content for aging, accelerating the aging process, shortening the aging time, and ensuring the quality of the aging product. To further ensure the environmental stability of the container, it is placed in an intelligent tea storage warehouse. This intelligent tea storage warehouse also has temperature, humidity, and oxygen supply functions, and also has a sterilization device, placing the container in a sterile environment with suitable temperature, humidity, and oxygen content, further ensuring the conditions required for tea aging and improving the stability of the aging process.

[0025] 3) Bamboo charcoal fiber box packaging: The aged tea leaves are packed into a bamboo charcoal fiber box. The bamboo charcoal fiber box is equipped with 80-100 mesh laser micropores, and a layer of dried bamboo leaves is laid inside the bamboo charcoal fiber box. The Baihao Yinzhen tea is wrapped in the dried bamboo leaves. The bamboo charcoal fiber box has the advantages of moisture-proof, anti-corrosion, environmental protection, and no odor. The dried bamboo leaves inside the box can insulate against heat and moisture, and can also produce a delicate bamboo fragrance, which optimizes the quality and flavor of Baihao Yinzhen tea.

[0026] 4) Vacuum preservation: The packaged bamboo charcoal fiber boxes are stacked into the container, and the container is vacuumed to stop the oxidation and aging reaction of Baihao Yinzhen tea, so that the tea can be preserved and stored in a vacuum environment, thus ensuring that the tea retains the taste after aging.

[0027] To further illustrate how the present invention can improve the quality and efficiency of tea aging, the equipment structure involved in the above method is described in detail below.

[0028] The dual-heat roasting machine 100 includes a roasting tank 11, which is 2.6m long, 1.2m wide, and 0.9m deep. The roasting tank 11 includes a bottom 111 and sides 112 on both sides of the bottom 11. The sides 112 are made of stainless steel. The bottom 111 has a double-layer structure: the inner wall is made of ceramic (ceramic layer 1111), and the outer wall is made of aluminum-titanium alloy composite material (aluminum-titanium alloy composite layer 1112). The high strength, flexibility, rapid heat conduction, and uniform heat distribution of aluminum-titanium alloy improve the drying efficiency and heating uniformity of the tea. The non-stick properties of the ceramic inner wall solve the problem of tea juice sticking to the pan and scorching during roasting, affecting quality. To reduce heat loss, a quartz mica insulation layer 17 is wrapped around the outermost layer of the U-shaped tank 121 to prevent heat loss and maintain the roasting temperature. In order to ensure that the tea leaves in the roasting tank are roasted evenly, 4-5 turning devices 15 are also provided at intervals in the roasting tank 11. The turning devices 15 are preferably made of pine wood with a sawtooth structure, so as to intermittently turn the tea leaves in the tank so that they are evenly roasted by electromagnetic and hot air.

[0029] The electromagnetic device 12 includes a U-shaped groove 121 fitted outside the roasting tank 11. Three sets of electromagnetic heating coils 122 are installed inside the U-shaped groove 121, and an electromagnetic generator 123 is connected to each electromagnetic heating coil 122. The three sets of electromagnetic heating coils 122 are evenly laid out in the U-shaped groove 121 at intervals of 0.7-0.8m. The high temperature of 130-150℃ electromagnetic radiation generated by electromagnetic induction heats the tea leaves in the roasting tank 11. To prevent direct electromagnetic radiation from scorching the tea leaves, the lower third of the roasting tank 11 is placed inside the U-shaped groove 121, with a gap of 0.8-1.1cm between the U-shaped groove 121 and the roasting tank 11. This gap is filled with silicon carbide (diamond sand) 16 for intermittent low-radiation heat conduction. This not only blocks electromagnetic waves from scorching the tea leaves but also retains heat, improving drying efficiency and promoting the volatilization of aromatic substances to enhance aroma.

[0030] The air-source heat pump 13 is a KFRD-51LW / Y1 type air-source heat pump. This machine also has the function of switching between hot and cold air modes. In hot air mode, it can directly blow 55-65℃ hot air into the roasting tank 11. If the roasting temperature inside the roasting tank 11 is too high, it can switch to cold air mode, blowing 15-20℃ cold air to cool it down, achieving dual-purpose functionality. Two roasting hot air pipes 131 of the air-source heat pump 13 are arranged side-by-side at the air inlet of the hot air chamber 132, located 40-50cm from the feeding end of the roasting tank 11. The hot air chamber 132 is funnel-shaped, and its outlet width matches the width of the roasting tank, so that 50-55℃ hot air is blown into the tank with equal width. The blowing force of the hot air also promotes the dissipation of moisture from the tea leaves, achieving rapid drying. To prevent hot air from directly damaging the tea buds, a 120-130 mesh stainless steel filter cover 133 is installed at the air outlet of the hot air chamber 132 to soften the airflow and blow a gentle breeze into the trough to dry the tea leaves.

[0031] The temperature and humidity monitoring and control device 14 consists of an FST100-2001 type temperature and humidity sensor 141 and an intelligent controller 142. The sensor probe is positioned in the middle of the roasting tank 11. The intelligent controller 142 first sets the following parameters: electromagnetic roasting temperature, hot air blowing temperature, the interval turning time of the turner 15, and the roasting time, to achieve dual-heat drying of the tea leaves. Then, the temperature and humidity signals detected by the temperature and humidity sensor 141 are input into the intelligent controller 142, which adjusts the electromagnetic temperature of the electromagnetic device and the hot and cold air temperatures of the air-source heat pump to achieve efficient roasting of the tea leaves in the tank. Drying is stopped when the moisture content is between 5% and 6%.

[0032] The container 200 includes a container body 21. The container body 21 is connected to a first temperature control device 22, a first oxygen supply device 23, and a dehumidification and vacuuming device 24 to control the temperature, humidity, and oxygen of the container body 21, so that the Baihao Yinzhen tea can always be aged in a constant environment, thereby improving the aging speed and quality. In addition, the container body 21 occupies a small area, making it convenient for storage and movement.

[0033] The container body 21 is preferably 6.1 meters long, 2.1 meters wide, and 1.8 meters high, with a volume of approximately 30 cubic meters. The container body 21 has a double-layer structure; the inner liner 211 is made of laser-perforated stainless steel, and the outer shell 212 is made of aluminum alloy. To prevent corrosion and to prevent hot, humid air in summer and cold, humid air in winter from entering the container, and to prevent temperature leakage from the container from affecting the aging process of Baihao Yinzhen tea, a heat-insulating coating 218 is applied to the aluminum alloy outer shell 212. This heat-insulating coating 218 is preferably made of glass flake anti-corrosion paint to prevent external air from entering and internal heat from dissipating. Simultaneously, a 2-3 cm thick oxygen-enriching layer 213 is provided between the inner liner 211 and the outer shell 212. The outer shell 212 is provided with an oxygen inlet 215 for filling the oxygen-enriching layer 213 with oxygen. The oxygen inlet 215 is normally blocked with a cap, and when oxygen is needed, it connects to the first oxygen supply device 23 for oxygen supply. The oxygen-enriched layer 213 can further improve the heat preservation effect. At the same time, oxygen can be slowly replenished into the container 1 through laser micropores to replenish the oxygen consumed during the tea aging process.

[0034] To facilitate the transport and storage of Baihao Yinzhen tea, a double-layered door 214 is installed in the middle of one side of the container body 21. This door is connected to the container body 21 via hinges and its opening and closing are controlled by rotation. The double-layered door 214 includes an independently operable inner door 2141 and an outer door 2142. The inner door 2141 is made of tempered glass, while the outer door 2142 is made of aluminum alloy. Both doors are fitted with latex door frames for sealing. This double-layered door design provides excellent sealing and allows for easy observation of the tea's storage condition through the transparent tempered glass inner door 2141 by simply opening the outer door 2142, thus facilitating quality control during storage.

[0035] To facilitate the storage of Baihao Yinzhen tea from different origins, tea varieties, and grades within the container, it can be divided into two independent storage compartments 10 using one partition 216, or into three independent storage compartments using two partitions 216, or further divided by more partitions 216, as needed. The partitions 216 are detachable for easy adjustment to accommodate various types of white tea. To facilitate observation of the appearance changes of the stored Baihao Yinzhen tea and to allow for sampling and evaluation of its aging process and effects, each independent storage compartment 10 is equipped with an openable tempered glass viewing window 217. This allows for observation of the tea storage conditions and also enables the taking of samples for evaluation.

[0036] To monitor the temperature, humidity, and oxygen content inside the container 21, a second temperature and humidity sensor 224 and a second oxygen sensor 233 are installed in the independent storage room 10. This allows for timely detection of the temperature, humidity, and oxygen content in each independent storage room 10 within the container. The detected temperature, humidity, and oxygen content signals are then input into the second intelligent controller 29 for regulation, ensuring that Baihao Yinzhen tea is stored and aged in a suitable temperature, humidity, and oxygen environment, thereby improving the quality of aging and accelerating the aging process.

[0037] To facilitate the input of cold or hot air into the independent storage compartments 10 for temperature regulation, and to facilitate the turning of tea leaves to improve the uniformity of aging, a set of turning rollers 25 are rotatably installed on the other side of the container body 21 opposite to the double-layer door 214. Each turning roller 25 corresponds one-to-one with an independent storage compartment 10, meaning at least one turning roller 25 is provided in each independent storage compartment 10. The turning roller 25 is a hollow tube, with an air inlet 251 at one end outside the container body 21 for easy connection to the first temperature control device 22, allowing the input of cold or hot air as needed. Ventilation holes 252 are evenly distributed on the roller wall inside the container body 21. These ventilation holes 252 preferably use a 20-25 mesh size, through which hot or cold air is blown into the independent storage compartments 10. A set of turning devices 253 is provided on the turning roller 25, and the rotation of the turning roller 25 agitates the tea leaves through the turning devices 253. The turning device 253 includes a set of turning claws 2531 fixedly and offset on the turning roller 25 and a throwing disc 2532 disposed on the turning claws 2531. The throwing disc 2532 can carry tea leaves and drive them upward. When the throwing disc 2532 moves to its highest point and then moves downward, the tea leaves on the throwing disc 2532 are thrown downward, thereby improving the uniformity of turning. To facilitate the control of the turning roller 25 rotation, the turning roller 25 is rotatably mounted on the side wall of the container body 21 through a bearing seat 256. The turning roller 25 is provided with a rotating gear 254. The container body 21 is also provided with a drive motor 27, which is provided with a drive gear 271. A transmission chain 28 is provided between the drive gear 271 and the rotating gear 254, so that the turning roller 25 on the entire container body 21 can be rotated by one drive motor 27.

[0038] The top of the container body 21 is also equipped with a set of exhaust pipes 26. One end of the exhaust pipe 26 extends into the inner liner 211, and the other end is connected to a dehumidification and vacuuming device 24. When dehumidification and vacuuming are required, the dehumidification and vacuuming device is turned on to dehumidify or vacuum the container body. The number of exhaust pipes 26 corresponds one-to-one with the number of independent storage rooms 10, and each independent storage room 10 is equipped with one exhaust pipe 26.

[0039] The first temperature control device 22 includes a first air-source heat pump 221, which is a KFRD-51LW / Y2 type air-source heat pump. This unit is equipped with a refrigeration device and a heat energy conversion module, and provides cold and hot air respectively through a cold air chamber and a hot air chamber. In winter, the hot air module can directly blow 30-40℃ hot air into the container for heating, while in summer, the cold air module can blow 15-20℃ cold air for cooling, achieving dual-purpose functionality. The first air-source heat pump 221 is arranged outside the container so that it can be connected to multiple containers 21 as needed to blow cold and hot air to them for temperature control. The air-source heat pump 221 is equipped with a first cold air pipe 222 and a first hot air pipe 223. Both the first cold air pipe 222 and the first hot air pipe 223 are equipped with a set of air outlet branches to facilitate connection with each turning roller 25. The temperature and air volume of the cold and hot air are controlled by valves and intelligent controllers to adjust the temperature of each storage room in the container and realize intelligent temperature control for storing Baihao Yinzhen tea.

[0040] The first oxygen supply device 23 includes a first PSA oxygen generator 231, which consists of an oxygen production module and an analysis and control module. It features stable oxygen production, high oxygen output, low energy consumption, and long service life, and can provide 100-150 cubic meters per hour of oxygen with a purity of over 90% to the container. The oxygen generator 231 is connected to an oxygen pipe 232, which is connected to the container's oxygen interface 215. The oxygen input is programmed and regulated via valves and a second intelligent controller 29 to ensure the oxygen-enriched layer 213 is filled with oxygen.

[0041] The vacuum dehumidification device 24 includes an RB-32A type food-grade negative pressure vortex air pump vacuum dehumidifier 241. The vacuum dehumidifier 241 is equipped with a vacuum dehumidification pipe 242, which has multiple branches that connect to the turning roller 25. The machine has a pumping speed of 5.5 L / s, an air volume of 120 m³ / h, and a maximum negative pressure of 0.1 MPa. The vacuum dehumidification pipe 242 can efficiently remove moisture from the container 21 and also perform vacuuming to stop the fermentation process. The vacuum dehumidifier 41 is placed outside the container and can be connected to multiple containers 21 as needed for vacuum dehumidification. When the second temperature and humidity sensor 224 inside the container 21 detects that the humidity inside the container 21 is higher than 75%, the machine is immediately activated to remove moisture through the dehumidification pipe, maintaining the humidity in the storage room between 30-40%. When the Baihao Yinzhen tea reaches the predetermined storage time and is deemed to have completed the aging process and achieved the desired aging effect after sampling and evaluation, it is necessary to turn on the vacuum dehumidifier to remove all the air from the container in order to control the temperature and humidity and stop the aging process under vacuum.

[0042] The intelligent tea storage warehouse 400 includes a storage and aging chamber 41, a second temperature control device 42, a dehumidification device 43, a second oxygen supply device 44, a sterilization device 45, and an intelligent control system 46.

[0043] The storage and aging chamber 41 is a high-ceilinged warehouse measuring 80m long, 9m wide, and 3.1m high, with a volume of approximately 700 cubic meters. To ensure light-proof and heat-insulated storage of white tea, the walls of the storage and aging chamber 41 have no windows. A dehumidification device 43 removes waste gas from the warehouse, while a second oxygen supply device 44 introduces fresh air. This closed structure prevents external light and humid heat from entering the warehouse and affecting the aging process. The walls of the storage and aging chamber 41 are designed with a double-layer structure. The outer wall uses aluminum alloy wall panels 411, which, due to their light-blocking, corrosion-resistant, rust-free, and airtight properties, prevent light, heat, moisture, electromagnetic waves, and microbial contamination from entering the storage and aging chamber. The inner wall uses cedar wood wall panels 412, which, due to their dryness, natural wood aroma, and antibacterial properties (containing cedarwood alcohol), help transform the stored Baihao Yinzhen tea into a tea with a sweet aroma and mellow, refreshing taste. To facilitate the entry and exit of raw materials and personnel, a sensor door 416 is installed on the storage and aging chamber 41 to enable closed, light-proof, temperature-controlled, humidity-controlled, and oxygen-enriched storage of Baihao Yinzhen tea.

[0044] The second temperature control device 42 includes a second air-source heat pump 421, which is a KFRD-51LW / Y2 type air-source hot air blower. This blower utilizes the reverse Carnot cycle principle and air-source heat pump technology to obtain ambient temperature air from outside the warehouse and convert it into high-temperature hot air. Additionally, it has the function of switching heat energy modes to provide cold air, allowing for dual-purpose temperature control within the warehouse. The second air-source heat pump 421 is equipped with a second cold air duct 422 and a second hot air duct 423. The storage and aging chamber 41 is equipped with a set of cold air inlets 413 connected to the second cold air duct 422 and a set of hot air inlets 414 connected to the second hot air duct 423. Ten cold air inlets 413 and ten hot air inlets 414 are alternately arranged at intervals of 7-8 meters on the top of the storage and aging chamber, while six cold air inlets 413 and six hot air inlets 414 are spaced 10-12 meters apart. Arranged crosswise on the side walls of the storage and aging chamber and located in the lower middle part of the side walls, it forms a three-dimensional space for mutual blowing of hot and cold air. In winter, hot air mode is used to blow 30-40℃ hot air into the storage and aging chamber to heat it, and in summer, cold air mode is used to blow 15-20℃ cold air into the storage and aging chamber to cool it down. It can also be regulated by the intelligent control system 46 to keep the tea storage temperature in the storage and aging chamber between 22-26℃ all year round, so as to achieve constant temperature storage and aging of Baihao Yinzhen tea.

[0045] The dehumidification device 43 is an RB-32A type negative pressure exhaust dehumidifier 431. Five exhaust ports 417 are provided on each side of the bottom of the storage and aging chamber 41. The exhaust ports 417 are connected to the exhaust dehumidifier 431 via exhaust pipes 432. Through the intelligent control system 46, the exhaust dehumidifier 431 extracts humid and hot exhaust gas from the bottom of the storage and aging chamber 41. When the sensor detects that the humidity inside the storage and aging chamber is higher than 75%, the machine automatically starts to extract and dehumidify, maintaining the humidity inside the storage and aging chamber 41 between 30-40%, thus controlling humidity and venting for the storage and aging of Baihao Yinzhen tea.

[0046] The second oxygen supply device 44 includes a second PSA oxygen generator 441, which consists of an oxygen production module and an analysis and control module. It features stable oxygen production, large oxygen output, low energy consumption, and long service life. It can supply 100-150 cubic meters / hour of oxygen with a purity of over 90% to the storage and ethanolation chamber. The oxygen generator 441 is positioned outside the storage and ethanolation chamber 41, and is equipped with an oxygen delivery pipe 442. The top of the storage and ethanolation chamber 41 has two oxygen inlets 415, and each of the two side walls of the storage and ethanolation chamber 41 has one oxygen inlet 415 located in the middle. The oxygen inlets 415 are connected to the oxygen delivery pipes 442. The oxygen content in the storage and aging chamber is regulated by the third oxygen sensor 462 and the intelligent control system 46. When the third oxygen sensor 462 detects that the oxygen content is lower than 45,000 kcal / cm3, it will turn on the oxygen supply in time, so that Baihao Yinzhen tea can carry out efficient oxidation and aging reaction in an oxygen-rich environment, thereby accelerating the aging process and shortening the aging time.

[0047] The sterilization equipment 45 is a DSD-X150 ceiling-mounted plasma sterilizer. Four plasma sterilizers are embedded in the top of the storage and aging chamber at 18-20m intervals to perform molecular sieve filtration and plasma ionization sterilization on the air inside the storage and aging chamber. The advantages of this plasma sterilizer are that its sterilization effect is stronger than ultraviolet light, it does not produce ozone odors, and it can efficiently degrade harmful and toxic gases in the air, effectively remove odors such as smoke and fumes, and especially release negative oxygen ions to enhance air freshness. It is a new type of equipment beneficial for the disinfection and sterilization of Baihao Yinzhen tea storage warehouses.

[0048] The intelligent control system 46 consists of a third temperature and humidity sensor 461, a third oxygen sensor 462, and a third intelligent controller 463. Two third temperature and humidity sensors 461 are arranged at a distance of 30-35m on the top of the storage and aging chamber 41. Four third temperature and humidity sensors 461 are arranged at the midpoints of the east, south, west, and north sides of the inner wall of the storage and aging chamber 41. Three third oxygen sensors 462 are arranged at the midpoints of the top and left and right walls of the storage and aging chamber 41. The system uses a "nine-point method" to measure the actual temperature, humidity, and oxygen content inside the tea storage chamber. The signals from each sensor are networked with the third intelligent controller 463 for control. The system operates when the storage temperature is above 28℃ and below 20℃, the humidity is above 75%, and the oxygen ion content is below 45,000 ions / cm³. 3 When the time comes, the control system 46 will automatically start the second hot air duct, the exhaust dehumidifier, and the oxygen supply machine to heat, cool, dehumidify, and supply oxygen, so as to intelligently control the constant temperature, humidity, and oxygen-enriched storage of Baihao Yinzhen tea.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A method for aging and preserving Baihao Yinzhen tea, characterized in that, Includes the following steps: 1) Re-drying and aroma enhancement: The tea leaves are fed into a dual-heat energy roasting machine (100) for re-drying and aroma enhancement. The dual-heat energy roasting machine uses electromagnetic heating and hot air as two heat sources to dry the tea leaves. The settings are: leaf thickness is 8-10 cm, electromagnetic temperature is 75-80°C, hot air temperature is 50-55°C, re-drying time is 10-15 min, and the moisture content after re-drying is controlled between 4.5-5.5%. 2) Containerized Oxygen-Enriched Aging: The re-dried and aroma-enhanced tea leaves are placed in a container (200) for temperature- and humidity-controlled oxygen-enriched aging. The settings are: aging temperature controlled between 22-26℃, aging humidity maintained between 30-40%, and negative oxygen ion content maintained between 48,000-50,000 / cm³. 3 The aging time is 350-360 days. 3) Bamboo charcoal fiber box packaging: After the tea leaves have been aged, they are packed into a bamboo charcoal fiber box (300). The bamboo charcoal fiber box (300) is provided with 80-100 mesh laser micropores, and a layer of dried bamboo leaves is laid inside the bamboo charcoal fiber box. The Baihao Yinzhen tea is wrapped in the dried bamboo leaves. 4) Vacuum preservation: The packaged bamboo charcoal fiber boxes (300) are stacked into the container (200), and the container (200) is vacuumed to preserve the tea in a vacuum environment.

2. The method for aging and preserving Baihao Yinzhen tea according to claim 1, characterized in that: The dual-heat roasting machine (100) in step 1) includes a roasting tank (11). An electromagnetic device (12) is provided below the roasting tank (11) to provide electromagnetic radiation heat to the tea leaves in the tank. An air-source heat pump (13) is provided at the feeding end of the roasting tank (11) to blow air into the tank. A temperature and humidity detection device (14) is also provided inside the roasting tank (11). The roasting tank (11) includes a bottom (111) and sides (112) on both sides of the bottom (111). The sides (112) are made of stainless steel. The bottom (111) has a double-layer structure, with an inner wall of a ceramic material layer (1111) and an outer wall of an aluminum-titanium alloy composite material layer (1112).

3. The method for aging and preserving Baihao Yinzhen tea according to claim 1, characterized in that: The container (200) in step 2) includes a container body (21), which includes an inner liner (211) and an outer shell (212). The inner liner (211) is provided with laser micro-holes, and an oxygen-enriched layer (213) is provided between the inner liner (211) and the outer shell (212). The outer shell (212) is provided with an oxygen inlet (215) for filling the oxygen-enriched layer (213) with oxygen. One side of the container body (21) is provided with a double-layer door (214), and the other side is rotatably equipped with a set of turning rollers (25). The turning rollers (25) are hollow tubes, and one end located outside the container body (21) is provided with an air inlet (251). The inner wall of the roller is uniformly provided with ventilation holes (252), and a set of turning devices (253) is provided on the turning roller (25); the top of the container body (21) is also provided with an exhaust pipe (26), one end of the exhaust pipe (26) extends into the inner liner (211); the container body (21) is provided with a second temperature and humidity sensor (224) and a second oxygen sensor (233), and is also provided with a first oxygen supply device (23) connected to the oxygen interface (215), and a first temperature control device (22) connected to the turning roller (25) to input hot and cold air into the container body (21) to regulate the temperature; the exhaust pipe (26) is connected to a vacuum dehumidification device (24).

4. The method for aging and preserving Baihao Yinzhen tea according to claim 1, characterized in that: The container (200) is stored in the intelligent tea storage warehouse (400), which includes a storage aging chamber (41). The storage aging chamber (41) is equipped with a second temperature control device (42) for maintaining a constant temperature inside the chamber. The storage aging chamber (41) is connected to a dehumidification device (43) for discharging moisture from the storage aging chamber (41) and an oxygen supply device (44) for supplying oxygen to the storage aging chamber (41). The storage aging chamber (41) is also equipped with a sterilization device (45) for sterilizing the storage aging chamber (41). An intelligent control system (46) is also provided. The intelligent control system (46) controls the operation of the dehumidification device (43), the oxygen supply device (44), and the sterilization device (45) according to the temperature, humidity, and oxygen content inside the storage aging chamber (41).

5. The method for aging and preserving Baihao Yinzhen tea according to claim 4, characterized in that: The second temperature control device (42) includes a second air-source hot and cold air blower (421), which is provided with a second cold air duct (422) and a second hot air duct (423). The storage aging chamber (41) is provided with a set of cold air inlets (413) connected to the second cold air duct (422) and a set of hot air inlets (414) connected to the second hot air duct (423). The cold air inlets (413) and hot air inlets (414) are arranged alternately. The sterilization device (45) is a set of plasma sterilizers arranged on the top of the storage aging chamber (41).

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