Multi-mode curing barn for curing tobacco leaves difficult to cure through high-nitrogen low-oxygen technology

Abstract

The invention belongs to the technical field of tobacco leaf processing equipment and curing, and particularly relates to a multi-mode curing barn for curing tobacco leaves difficult to cure by using a high-nitrogen and low-oxygen technology, which comprises a high-nitrogen and low-oxygen system, a heating chamber and a cuboid cantilever curing barn which are communicated in sequence, and the cuboid cantilever curing barn is separated from the middle of the heating chamber by a wall body or a thermal insulation material and is designed into boxes. The method effectively reduces the frequent enzymatic browning reaction phenomenon of the tobacco leaves in the curing process, inhibits the respiration and hunger metabolism of the tobacco leaves in the curing color fixing period, ensures uniform-temperature curing in a curing barn, and improves the quality and yield of the tobacco leaves.

Description

Technical Field

[0001] The invention belongs to the technical field of tobacco leaf processing equipment and modulation, and specifically relates to a multi-mode curing room that uses a high-nitrogen and low-oxygen technology to modulate difficult-to-cured tobacco leaves. Background Art

[0002] Baking is the process of heat and moisture exchange between tobacco leaves and the environment and the solidification of tobacco leaf quality. It is an important link to achieve tobacco leaf quality improvement, efficiency enhancement, energy conservation and carbon reduction. The flue-curing room is the main place for tobacco leaf baking. The air source heat pump flue-curing room is the main type of flue-curing room in my country's tobacco leaf baking field that actively responds to the "dual carbon" goal of clean, low-carbon, safe and efficient production. At present, the existing air source heat pump tobacco flue-curing rooms are mainly divided into closed, open and open and closed integrated types. Among them, the closed flue-curing room can efficiently utilize heat energy, but there is a problem of frequent browning reaction due to poor moisture removal in the late yellowing and early color setting period; the open flue-curing room has smooth moisture removal, but there are problems such as heat loss and large volatilization of aroma components in the dry tendon period; although the open and closed integrated flue-curing room can switch the opening and closing mode, it has low heating efficiency, large temperature difference in the internal baking area, limited tobacco loading and long baking cycle. In addition, the tobacco varieties and climate types in my country's tobacco-growing areas are diverse, especially the special tobacco varieties and abnormal climate make it difficult to master the quality and baking characteristics of fresh tobacco leaves, and it is very easy to burn bad tobacco. A large number of studies have shown that the tobacco leaf baking loss rate in my country exceeds 15%, of which bad tobacco accounts for the majority, and bad tobacco caused by enzymatic browning accounts for far more than 30%. The conditions for the enzymatic browning reaction are that polyphenols and polyphenol oxidase come into contact in large quantities at a temperature of 44°C-48°C, in an environment of moisture and oxygen. Reducing the oxygen content in the baking room is one of the effective measures to prevent the occurrence of enzymatic browning. Summary of the invention

[0003] The present invention solves the problem that the existing curing barns are unable to provide uniform temperature hot air and low oxygen conditions for curing difficult-to-cured tobacco leaves, thereby causing enzymatic browning reaction to produce bad tobacco, and provides a dual-system multi-mode curing barn that uses high-nitrogen and low-oxygen technology to prepare difficult-to-cured tobacco leaves.

[0004] The technical solution claimed in the present invention is as follows:

[0005] A multi-mode curing room for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology, comprising a high-nitrogen and low-oxygen system, a heating chamber, and a rectangular cantilever curing room separated from one side of the heating chamber by a wall or insulation material and designed in a box;

[0006] The heating chamber comprises a variable frequency circulation fan suspended on the upper inner wall of the wall of the heating chamber near the cantilevered baking room and penetrating the wall to connect the heating chamber and the cantilevered baking room, a gas mixing chamber arranged at the bottom of the heating chamber and having a separate closed space and connected to the space where the variable frequency circulation fan is located through a pipeline and connected to the air outlet of the high nitrogen and low oxygen system through a pipeline, a dehumidification port penetrating the wall of the heating chamber and located at the bottom of the wall away from the cantilevered baking room, and a fresh air port penetrating the wall of the heating chamber;

[0007] A plurality of grilles are arranged in the cantilevered baking room in the height direction, and the left and right ends are fixed on the left and right walls of the cantilevered baking room and there is a certain interval with the front and rear walls to divide the cantilevered baking room into upper and lower multi-level rectangular cantilevered smoking chambers, and the grilles are wall materials or thermal insulation materials; the interval between the bottom of the cantilevered smoking chamber and the bottom insulation wall of the cantilevered baking room constitutes a lower longitudinal fan channel, and the interval between the wall of the cantilevered baking room on the side away from the heating chamber and the door and the cantilevered smoking chamber constitutes a rear vertical fan channel, and the interval on the wall close to the heating chamber constitutes a front vertical fan channel; the cantilevered smoking chambers of various levels extending longitudinally constitute multi-level longitudinal fan channels, and the longitudinal fan channels have fixedly arranged horizontal uniform wind plates; the front and rear vertical fan channels are respectively provided with half-moon guide plates at the corners formed with the longitudinal fan channels of various levels, and the front side of the lower longitudinal fan channel passes through the front insulation wall of the cantilevered baking room to form a return air outlet of the gas mixing chamber leading to the heating chamber;

[0008] The cantilevered baking room is also provided with a smoke-carrying support, which includes a plurality of vertical bars equidistantly arranged in the front-back direction and penetrating and fixed on the grille, and a plurality of horizontal bars fixed on each vertical bar and extending left and right with the vertical bar as the center, wherein each horizontal bar is located at the lower side of the grille;

[0009] The door of the cantilever baking room is arranged on the cantilever baking room wall away from the heating chamber, one side of the cantilever baking room door is the rear of the cantilever baking room, and the side of the cantilever baking room close to the heating chamber is the front of the cantilever baking room.

[0010] Preferably, the thermal insulation material is polyethylene; a horizontal flow traction circulation fan is arranged in each of the longitudinal fan ducts and the front vertical fan channel; and the fresh air inlet is located in the middle of the wall of the heating chamber away from the cantilevered baking room.

[0011] Preferably, a hanging tobacco rod transmission device is also provided in the baking room, and the hanging tobacco rod transmission device comprises: a hanging tobacco rod transmission guide rail, a pressure positioning sensor installed on the hanging tobacco rod transmission guide rail, and a height controller and a driving motor fixed on the inner wall of the cantilever baking room chamber near the cantilever baking room door and connected to the hanging tobacco rod transmission guide rail; the hanging tobacco rod transmission guide rail comprises a vertical guide rail vertically fixed to the front and rear walls on both sides of the cantilever baking room chamber and a multi-level horizontal guide rail fixed to the inner wall of the grille directly above the horizontal rods in each layer of the cantilevered tobacco chamber, away from the wall; the two ends of the horizontal guide rail are smoothly connected to the vertical guide rail; the driving motor is placed at the top of the vertical guide rail and the end of the horizontal guide rail close to the heating chamber.

[0012] Preferably, the gas mixing chamber includes a rotating deflector and a vortex generator; the rotating deflector is located at the bottom of the heating chamber and vertically connected to the return air outlet; the vortex generators are equidistantly distributed on the circular shell edge of the upper part of the rotating deflector.

[0013] Preferably, the high-nitrogen and low-oxygen system comprises: a nitrogen cylinder parallel group consisting of a plurality of nitrogen cylinders connected in parallel, a pressure generator connected to the nitrogen output port of the nitrogen cylinder parallel group, an extended modular manifold pneumatic tube connected at one end to the nitrogen cylinder parallel group and at the other end to a gas mixing chamber and transmitting nitrogen from the nitrogen cylinder parallel group to the gas mixing chamber, a sensor equipped with a corresponding signal processing unit and a wireless communication module, and a nitrogen sealing start-stop module connected to the nitrogen cylinder parallel group, the pressure generator, and key components of the extended modular manifold pneumatic tube and connected to the sensor via a wireless signal; the nitrogen cylinder The parallel group is suspended and fixed on the outer wall of the bottom of the heating chamber near the gas mixing chamber and is connected to the gas mixing chamber through an air duct; the extended modular collecting pneumatic tube interacts with the pressure generator to reduce the nitrogen discharge pressure to prevent overpressure; a check valve is arranged on the air duct; the nitrogen sealing start-stop module determines whether the dynamic airflow of each cantilevered smoke chamber meets the oxygen and nitrogen content thresholds according to the information fed back by the nitrogen and oxygen concentration sensors and the temperature sensors, and starts and stops the high-nitrogen and low-oxygen system; the sensors include nitrogen and oxygen concentration sensors and temperature sensors; the start and stop are achieved by opening and closing the check valve.

[0014] Preferably, the main body of the cantilevered baking room is a polyurethane sandwich panel, and the inner chamber is 8600mm long, 2700mm wide and 8500mm high; the cantilevered smoke loading chamber is a rectangular parallelepiped with the same width as the inner chamber of the cantilevered baking room, 8000mm long and 400mm high; the cantilevered smoke loading chamber is provided with a horizontal traction circulation fan at the air inlet and outlet respectively; the bottom end of the cantilevered baking room is an insulating nano-aluminum plate with a thickness of 1.5mm, which is inclined at 3°-5° along the wind direction.

[0015] Preferably, the pressure positioning sensor positions the cigarette rods at a distance of 120mm-140mm; the running directions of the hanging cigarette rod transmission guide rail are opposite when loading and taking out cigarettes; the wind uniform plate is made of aluminum plate with a thickness of 3mm; the ventilation holes are evenly distributed in the wind uniform plate; the ventilation holes have a diameter of 30mm, a 60° staggered arrangement, a center distance of 60mm, and an opening rate of 22.67%.

[0016] Preferably, the vortex generator is composed of a pair of thin sheets that form a certain angle with the gas flowing from bottom to top at the return air outlet.

[0017] Preferably, the angle of the half-moon guide plate refers to the angle between the half-moon guide plate and the airflow direction; along the airflow direction, the half-moon guide plate and the inlet airflow are inclined at 75°, 30°, 30°, and 75°, respectively.

[0018] Preferably, the high-nitrogen, low-oxygen system starts working and releases nitrogen when the conditions in all cantilevered smoke-loading rooms are 44°C ≤ temperature ≤ 48°C, nitrogen concentration ≤ 89%, and oxygen concentration ≥ 10%; the high-nitrogen, low-oxygen system stops working and shuts off nitrogen delivery when the conditions in all cantilevered smoke-loading rooms are temperature < 44°C or temperature > 48°C, nitrogen concentration > 89%, and oxygen concentration < 10%; the high-nitrogen, low-oxygen system detects the temperature and gas components in the cantilevered smoke-loading room by means of a temperature sensor and a nitrogen and oxygen concentration sensor.

[0019] Beneficial effects:

[0020] The invention provides a multi-mode curing barn for preparing difficult-to-cured tobacco leaves by applying a high-nitrogen and low-oxygen technology, comprising a high-nitrogen and low-oxygen system, a heating chamber, and a rectangular cantilever curing barn separated from one side of the heating chamber by a wall or a heat-insulating material and designed in a box in sequence; the heating chamber is heated by heat in the air, the high-nitrogen and low-oxygen system provides nitrogen and oxygen gas and finally transports the nitrogen and oxygen mixed gas to a cantilevered smoke loading chamber of the cantilever curing barn through a gas mixing chamber, so that nitrogen is filled into the cantilever curing barn for curing tobacco leaves, thereby inhibiting the consumption of dry matter by tobacco leaf respiration, reducing the probability of enzymatic browning reaction, inhibiting the respiration and hunger metabolism of tobacco leaves during the curing color-fixing period, improving the quality and yield of tobacco leaves, and solving the problem that the existing curing barns cannot provide low-oxygen conditions for curing difficult-to-cured tobacco leaves, thereby causing enzymatic browning reaction and resulting in bad tobacco leaves. The cantilevered curing room adopts a box design, and the heating chamber provides heat to each box separately so that the temperature at different positions in each box is balanced, ensuring that the curing room is baked at a uniform temperature, avoiding the problem of inconsistent yellowing and water loss of tobacco leaves due to horizontal or vertical temperature differences in the curing room, thereby damaging the tobacco leaves, improving the quality and yield of tobacco leaves, and solving the problem that existing curing rooms cannot provide uniform temperature hot air for baking difficult-to-cook tobacco leaves, thereby causing enzymatic browning reactions and damaging the tobacco.

[0021] The vortex generator is composed of a pair of thin sheets that form a certain angle with the gas flowing from bottom to top at the return air port, which can delay the separation of the boundary layer caused by fluid viscosity, thereby reducing the friction resistance and pressure difference resistance caused by turbulence.

[0022] The half-moon guide plates are arranged on both sides of the vertical ends of the L-shaped air duct, which is beneficial to reducing the flocculation generated by the gas flow and improving the air flow state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of a multi-mode flue-curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to an embodiment of the present invention.

[0024] Figure 2 It is a schematic diagram of a cantilevered baking room according to an embodiment of the present invention.

[0025] In the figure: 1. Heating chamber; 2. Cantilevered baking room; 3. High nitrogen and low oxygen system; 301. Nitrogen cylinder parallel group; 302. Pressure generator; 303. Extended modular collecting pneumatic tube; 304. Check valve; 305. Sensor; 4. Variable frequency circulating fan; 5. Gas mixing chamber; 501. Rotating deflector; 502. Vortex generator; 6. Dehumidification port; 7. Grille; 8. Cantilevered smoke chamber; 9. Lower longitudinal fan channel; 10. Front vertical fan channel; 11. Rear vertical fan channel; 12. Wind uniformity plate; 13. Suspended smoke rod transmission device; 14. Half-moon deflector; 15. Return air port; 16. Vertical rod; 17. Horizontal rod. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0027] The present invention provides a multi-mode curing room for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology, such as Figure 1 As shown, it includes a high nitrogen and low oxygen system, a heating chamber and a rectangular cantilevered baking room separated from the heating chamber by a wall or insulation material and designed as a box. The cantilevered baking room seen from the front is as shown in FIG. Figure 2 .

[0028] The heating chamber comprises a variable frequency circulation fan suspended on the inner wall above the wall of the heating chamber near the cantilevered baking room and penetrating the wall to connect the heating chamber and the cantilevered baking room, a gas mixing chamber arranged at the bottom of the heating chamber and having a separate closed space and connected to the space where the variable frequency circulation fan is located through a pipeline and connected to the air outlet of the high nitrogen and low oxygen system through a pipeline, a dehumidification port penetrating the wall of the heating chamber and located at the bottom of the wall away from the cantilevered baking room, and a fresh air port penetrating the wall of the heating chamber. In a specific embodiment of the present invention, the fresh air port is located in the middle of the wall of the heating chamber away from the cantilevered baking room.

[0029] In the cantilevered baking room, there are multiple grilles arranged in the height direction, whose left and right ends are fixed on the left and right walls of the cantilevered baking room and have a certain distance from the front and rear walls to divide the cantilevered baking room into upper and lower multi-level rectangular cantilevered smoking chambers. The grilles are wall materials or thermal insulation materials. In a specific embodiment of the present invention, the thermal insulation material is polyethylene; the gap between the bottom of the lowest cantilevered smoking chamber and the insulation wall at the bottom of the cantilevered baking room constitutes a lower longitudinal fan channel, and the gap between the wall of the cantilevered baking room away from the heating chamber and the door side and the cantilevered smoking chamber constitutes a rear vertical fan channel. The fan channel, the interval close to the wall on one side of the heating chamber constitutes a front vertical fan channel; the cantilevered smoke chambers extending longitudinally at various levels constitute a multi-stage longitudinal fan channel, and the longitudinal fan channel has a fixed horizontal wind plate. In a specific embodiment of the present invention, a horizontal flow traction circulation fan is arranged in each of the longitudinal fan ducts; the front and rear vertical fan channels are respectively provided with half-moon guide plates at the corners formed by the longitudinal fan channels at various levels, and the front side of the lower longitudinal fan channel passes through the front insulation wall of the cantilevered baking room to form a return air outlet to the gas mixing chamber of the heating chamber;

[0030] The cantilevered baking room is also provided with a smoke-carrying support in the inner chamber, which includes a plurality of vertical bars which are arranged equidistantly in the front-back direction and penetrate and are fixed on the grille, and a plurality of horizontal bars which are fixed on each vertical bar and extend left and right with the vertical bar as the center, and each horizontal bar is located at the lower side of the grille ( Figure 2 );

[0031] The door of the cantilever baking room is arranged on the cantilever baking room wall away from the heating chamber, one side of the cantilever baking room door is the rear of the cantilever baking room, and the side of the cantilever baking room close to the heating chamber is the front of the cantilever baking room.

[0032] In a specific embodiment of the present invention, a hanging tobacco rod transmission device is also provided in the baking room, and the hanging tobacco rod transmission device includes: a hanging tobacco rod transmission guide rail, a pressure positioning sensor installed on the hanging tobacco rod transmission guide rail, a height controller and a driving motor fixed on the inner wall of the cantilever baking room chamber near the cantilever baking room door and connected to the hanging tobacco rod transmission guide rail; the hanging tobacco rod transmission guide rail includes a vertical guide rail vertically fixed to the front and rear walls on both sides of the cantilever baking room chamber and a multi-level horizontal guide rail fixed to the inner wall of the grille just above the horizontal rods in each layer of the cantilevered tobacco chamber, away from the wall; both ends of the horizontal guide rail are parallel to the vertical guide rail Sliding transition connection; the driving motor is placed at the top of the vertical guide rail and the end of the horizontal guide rail near the heating chamber; specifically, the operation steps of the hanging tobacco rod transmission device are that the tobacco farmer first sets the specific number of layers of tobacco through the height controller, and then places the tobacco rods woven outdoors on the vertical guide rail. The vertical guide rail will transport the tobacco rods to the height of the target layer of the tobacco loading chamber, and further send it to the horizontal guide rail, and hang the tobacco rods on the horizontal rod. When the pressure positioning sensor on the conveying chain in the horizontal guide rail senses the weight of the tobacco rod, it will prompt the tobacco rod to move toward the heating chamber. Through this continuous cycle of operation, until the cantilevered tobacco loading chamber is filled. In the smoke discharge link, the steps are the same as when loading tobacco, and the operation direction is opposite.

[0033] The gas mixing chamber includes a rotating deflector and a vortex generator; the rotating deflector is located at the bottom of the heating chamber and is vertically connected to the return air outlet; the vortex generators are equidistantly distributed on the circular outer shell edge of the upper part of the rotating deflector; the mixed gas chamber is located inside the heating chamber, and the mixed gas flows through the pipeline and is blown by the variable frequency circulation fan to the front vertical fan channel of the cantilevered baking room and close to one side of the heating chamber, and is transported to each cantilevered smoke-loading chamber through the horizontal flow traction circulation fan installed in the fan channel.

[0034] The high nitrogen and low oxygen system comprises: a nitrogen cylinder parallel group consisting of a plurality of nitrogen cylinders connected in parallel, a pressure generator connected to the nitrogen output port of the nitrogen cylinder parallel group, an extended modular manifold pneumatic tube connected at one end to the nitrogen cylinder parallel group and at the other end to the gas mixing chamber and transmitting nitrogen from the nitrogen cylinder parallel group to the gas mixing chamber, a sensor equipped with a corresponding signal processing unit and a wireless communication module, and a nitrogen sealing start-stop module connected to the key components of the nitrogen cylinder parallel group, the pressure generator and the extended modular manifold pneumatic tube and connected to the sensor through a wireless signal; the nitrogen cylinder parallel group is suspended and fixed on the outer wall at the bottom of the heating chamber near the gas mixing chamber and connected to the gas mixing chamber through an air duct; the extended modular manifold pneumatic tube interacts with the pressure generator to reduce the nitrogen discharge pressure to prevent overpressure; a check valve is arranged on the air duct; the nitrogen sealing start-stop module judges whether the dynamic airflow of each cantilevered smoke chamber meets the oxygen and nitrogen content thresholds according to the information fed back by the nitrogen and oxygen concentration sensor and the temperature sensor and starts and stops the high nitrogen and low oxygen system; the sensor comprises a nitrogen and oxygen concentration sensor and a temperature sensor. degree sensor; the start and stop realizes the delivery and shut-down of nitrogen in the cantilevered baking room by opening and closing the check valve; in a specific embodiment of the present invention, the pressure generator is connected to the nitrogen output port of the nitrogen cylinder parallel group for pressure regulation of the nitrogen output from the nitrogen cylinder parallel group; the extended modular collecting pneumatic tube interacts with the pressure generator to reduce the nitrogen discharge pressure to prevent overpressure; the extended modular collecting pneumatic tube receives the nitrogen transmitted by the pneumatic pipeline and is used to summarize and distribute the airflow so as to further distribute the nitrogen; the extended modular collecting pneumatic tube is connected to the gas mixing chamber through the air duct; the nitrogen oxygen concentration sensor and the temperature sensor are equipped with corresponding signal processing units and wireless communication modules and transmit the opening and closing signals to the nitrogen sealing start and stop module of the high nitrogen and low oxygen system; the nitrogen sealing start and stop module is connected to the key components of the nitrogen cylinder parallel group, the pressure generator and the extended modular collecting pneumatic tube, and judges whether the dynamic airflow of each cantilevered smoke chamber meets the oxygen and nitrogen content thresholds according to the information fed back by the nitrogen oxygen concentration sensor and the temperature sensor, and starts and stops the high nitrogen and low oxygen system.

[0035] The high-nitrogen and low-oxygen system transmits nitrogen according to the nitrogen and oxygen content in the cantilevered curing room. When the nitrogen concentration in the cantilevered curing room is too low, the high-nitrogen and low-oxygen system transmits nitrogen to the gas mixing chamber. After the gas mixing chamber mixes the nitrogen and the gas in the heating chamber evenly, it is transmitted to each cantilevered smoking chamber of the cantilevered curing room through the air outlet of the variable frequency circulating fan to bake the tobacco leaves. The air entering each cantilevered smoking chamber is dry hot air, but the dry hot air will form moist and cold air after the heat and mass exchange with the fresh tobacco leaves. Therefore, the airflow coming out of each cantilevered smoking chamber is moist and cold air. Under the action of gravity, the moist and cold air flows from top to bottom through the rear vertical fan channel, and enters the gas mixing chamber from the return air port through the lowest longitudinal fan channel to be heated again by the heating chamber.

[0036] In a specific embodiment of the present invention, the main body of the cantilevered baking room is a polyurethane sandwich panel, and the inner chamber is 8600mm long, 2700mm wide and 8500mm high; the cantilevered smoke chamber is a rectangular circulation air duct with a length of 8000mm and a height of 400mm, which is the same width as the inner chamber of the cantilevered baking room; the air inlet and air outlet of the longitudinal fan channel are each provided with a horizontal traction circulation fan, and the air path circulation is from the heating chamber to the front vertical fan channel; the bottom of the cantilevered baking room is thick The heat-insulating nano-aluminum plate with a thickness of 1.5mm is inclined at 3°-5° along the wind direction of the series fan duct; the pressure positioning sensor positions the cigarette rod at a distance of 120mm-140mm; the running direction of the hanging annular cigarette rod transmission guide is opposite when loading and taking out cigarettes; the material of the uniform air plate is aluminum plate with a thickness of 3mm; the ventilation holes are evenly distributed in the uniform air plate; the diameter of the ventilation holes is 30mm, 60° staggered, 60mm center distance, and the opening rate is 22.67%.

[0037] The vortex generator is composed of a pair of thin sheets that form a certain angle with the gas flowing from bottom to top at the return air port, which can delay the separation of the boundary layer caused by fluid viscosity, thereby reducing the friction resistance and pressure difference resistance caused by turbulence.

[0038] The half-moon guide plate is inclined at an angle of 15° with the airflow direction, which is beneficial to reducing the flocculation caused by gas flow and improving the air flow state.

[0039] The high-nitrogen, low-oxygen system starts working and releases nitrogen when the conditions in all cantilevered smoke-loading rooms are 44°C ≤ temperature ≤ 48°C, nitrogen concentration ≤ 89%, and oxygen concentration ≥ 10%; the high-nitrogen, low-oxygen system stops working and shuts off nitrogen delivery when the conditions in all cantilevered smoke-loading rooms are temperature < 44°C or temperature > 48°C, nitrogen concentration > 89%, and oxygen concentration < 10%; the high-nitrogen, low-oxygen system detects the temperature and gas components in the cantilevered smoke-loading room through a temperature sensor and a nitrogen and oxygen concentration sensor.

[0040] It should be noted that the above-described specific implementations can enable those skilled in the art to more fully understand the invention, but do not limit the invention in any way. Therefore, although this specification has described the invention in detail with reference to the drawings and embodiments, those skilled in the art should understand that the invention can still be modified or replaced by equivalents. In short, all technical solutions and improvements that do not deviate from the spirit and scope of the invention should be included in the protection scope of the patent for the invention.

Claims

1. A multi-mode curing barn for curing difficult-to-cured tobacco leaves using high nitrogen and low oxygen technology, characterized in that: It comprises a high-nitrogen and low-oxygen system, a heating chamber and a rectangular cantilevered baking room separated from the heating chamber by a wall or insulation material and designed in a box. The heating chamber comprises a variable frequency circulation fan suspended on the inner wall above the wall of the heating chamber near the cantilevered baking room and penetrating the wall so as to connect the heating chamber and the cantilevered baking room, a gas mixing chamber arranged at the bottom of the heating chamber and having a separate closed space and connected to the space where the variable frequency circulation fan is located through a pipeline and connected to the air outlet of the high nitrogen and low oxygen system through a pipeline, a dehumidification port penetrating the wall of the heating chamber and located at the bottom of the wall away from the cantilevered baking room, and a fresh air port penetrating the wall of the heating chamber; A plurality of grilles are arranged in the cantilevered baking room in the height direction, and the left and right ends are fixed on the left and right walls of the cantilevered baking room and there is a certain interval with the front and rear walls to divide the cantilevered baking room into upper and lower multi-level rectangular cantilevered smoking chambers, and the grilles are wall materials or thermal insulation materials; the interval between the bottom of the cantilevered smoking chamber and the bottom insulation wall of the cantilevered baking room constitutes a lower longitudinal fan channel, and the interval between the wall of the cantilevered baking room on the side away from the heating chamber and the door and the cantilevered smoking chamber constitutes a rear vertical fan channel, and the interval on the wall close to the heating chamber constitutes a front vertical fan channel; the cantilevered smoking chambers of various levels extending longitudinally constitute multi-level longitudinal fan channels, and the longitudinal fan channels have fixedly arranged horizontal uniform wind plates; the front and rear vertical fan channels are respectively provided with half-moon guide plates at the corners formed with the longitudinal fan channels of various levels, and the front side of the lower longitudinal fan channel passes through the front insulation wall of the cantilevered baking room to form a return air outlet of the gas mixing chamber leading to the heating chamber; The cantilevered baking room is also provided with a smoke-carrying support, which includes a plurality of vertical bars equidistantly arranged in the front-back direction and penetrating and fixed on the grille, and a plurality of horizontal bars fixed on each vertical bar and extending left and right with the vertical bar as the center, wherein each horizontal bar is located at the lower side of the grille; The door of the cantilever baking room is arranged on the cantilever baking room wall away from the heating chamber, one side of the cantilever baking room door is the rear of the cantilever baking room, and the side of the cantilever baking room close to the heating chamber is the front of the cantilever baking room.

2. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The thermal insulation material is polyethylene; each of the longitudinal fan ducts and the front vertical fan channel is provided with a horizontal flow traction circulation fan; the fresh air inlet is located in the middle of the wall of the heating chamber away from the cantilevered baking room.

3. The dual-system multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The baking room is also provided with a hanging tobacco rod transmission device, which comprises: a hanging tobacco rod transmission guide rail, a pressure positioning sensor installed on the hanging tobacco rod transmission guide rail, a height controller and a driving motor fixed on the inner wall of the cantilever baking room chamber near the cantilever baking room door and connected to the hanging tobacco rod transmission guide rail; the hanging tobacco rod transmission guide rail comprises a vertical guide rail vertically fixed to the front and rear walls on both sides of the cantilever baking room chamber and a multi-level horizontal guide rail fixed to the inner wall of the grille directly above the horizontal rods in each layer of the cantilevered tobacco chamber, away from the wall; the two ends of the horizontal guide rail are smoothly connected to the vertical guide rail; the driving motor is placed at the top of the vertical guide rail and the end of the horizontal guide rail close to the heating chamber.

4. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The gas mixing chamber comprises a rotating deflector and a vortex generator; the rotating deflector is located at the bottom of the heating chamber and is vertically connected to the return air port; the vortex generators are equidistantly distributed on the circular outer shell edge of the upper part of the rotating deflector.

5. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The high-nitrogen and low-oxygen system comprises: a nitrogen cylinder parallel group consisting of a plurality of nitrogen cylinders connected in parallel, a pressure generator connected to the nitrogen output port of the nitrogen cylinder parallel group, an extended modular manifold pneumatic tube connected at one end to the nitrogen cylinder parallel group and at the other end to a gas mixing chamber and transmitting nitrogen from the nitrogen cylinder parallel group to the gas mixing chamber, a sensor equipped with a corresponding signal processing unit and a wireless communication module, and a nitrogen sealing start-stop module connected to the nitrogen cylinder parallel group, the pressure generator, and key components of the extended modular manifold pneumatic tube and connected to the sensor via a wireless signal; the nitrogen cylinder parallel group The group is suspended and fixed on the outer wall of the bottom of the heating chamber near the gas mixing chamber and is connected to the gas mixing chamber through an air duct; the extended modular collecting pneumatic tube interacts with the pressure generator to reduce the nitrogen discharge pressure to prevent overpressure; a check valve is arranged on the air duct; the nitrogen sealing start-stop module determines whether the dynamic airflow of each cantilevered smoke chamber meets the oxygen and nitrogen content thresholds according to the information fed back by the nitrogen and oxygen concentration sensors and the temperature sensors, and starts and stops the high-nitrogen and low-oxygen system; the sensors include nitrogen and oxygen concentration sensors and temperature sensors; the start and stop are achieved by opening and closing the check valve.

6. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The main body of the cantilevered baking room is a polyurethane sandwich panel, with an inner chamber of 8600mm long, 2700mm wide and 8500mm high; the cantilevered smoke loading chamber is a rectangular parallelepiped with the same width as the inner chamber of the cantilevered baking room, 8000mm long and 400mm high; the cantilevered smoke loading chamber is provided with a horizontal flow traction circulation fan at the air inlet and outlet respectively; the bottom end of the cantilevered baking room is an insulating nano-aluminum plate with a thickness of 1.5mm, which is inclined at 3°-5° along the wind direction.

7. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 5, characterized in that: The pressure positioning sensor positions the cigarette rod distance at 120mm-140mm; the running direction of the hanging cigarette rod transmission guide is opposite when loading and taking out cigarettes; the wind uniform plate is made of aluminum plate with a thickness of 3mm; the ventilation holes are evenly distributed in the wind uniform plate; the ventilation holes have a diameter of 30mm, 60° staggered arrangement, 60mm center distance, and an opening rate of 22.67%.

8. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 4, characterized in that: The vortex generator is composed of a pair of thin sheets which form a certain angle with the gas flowing from bottom to top at the return air outlet.

9. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The half-moon guide plate angle refers to the angle between the half-moon guide plate and the airflow direction; along the airflow direction, the half-moon guide plate and the inlet airflow are inclined at 75°, 30°, 30°, and 75° respectively.

10. The multi-mode curing barn for curing difficult-to-cured tobacco leaves using high-nitrogen and low-oxygen technology according to claim 1, characterized in that: The high-nitrogen, low-oxygen system starts working and releases nitrogen when the conditions in all cantilevered smoke-loading rooms are 44°C ≤ temperature ≤ 48°C, nitrogen concentration ≤ 89%, and oxygen concentration ≥ 10%; the high-nitrogen, low-oxygen system stops working and shuts off nitrogen delivery when the conditions in all cantilevered smoke-loading rooms are temperature < 44°C or temperature > 48°C, nitrogen concentration > 89%, and oxygen concentration < 10%; the high-nitrogen, low-oxygen system detects the temperature and gas components in the cantilevered smoke-loading room through a temperature sensor and a nitrogen and oxygen concentration sensor.

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