A biomass fuel drying room for agricultural products

Abstract

The present application relates to the technical field of drying equipment and discloses a biomass fuel drying room for agricultural products, comprising a drying chamber, a burner disposed on one side of the drying chamber, a hot air pipe connected to the upper end of the burner, a heating channel disposed above the drying chamber, a collecting chamber disposed on the side of the drying chamber away from the burner, the collecting chamber communicating with the heating channel, and a fan disposed near the middle of the collecting chamber for blowing air into the drying chamber. Air circulates within the drying chamber, and the air involved in drying is fully heated by the hot air pipe, ensuring that the temperature of the hot air contacting each shelf is consistent, thereby improving drying quality. Dehumidification and ventilation are implemented when the temperature is too high, thereby controlling temperature and humidity changes within the drying chamber within a smaller range, making it easier for staff to accurately assess the drying status of the crops and ensuring drying quality. This also avoids sudden temperature changes during dehumidification and ventilation, further ensuring the drying quality of the crops.

Description

Technical Field

[0001] The present application relates to the technical field of drying equipment, and in particular to a drying room for agricultural products using biomass fuel. Background Art

[0002] The biomass fuel drying room uses a burner to burn biomass fuel. The hot air generated by the burner flows through the pipe to the space above the drying room, heating the air above the drying room. The upper space is connected to the air inlet fan of the drying room, and the hot air flows into the drying room to dry the agricultural products inside. In addition, a dehumidification port is also set in the drying room. When the humidity exceeds the set humidity, the control system will control the fan to exhaust moisture. The technical problem of this equipment is that the hot air used to be directly from the side of the furnace body and pressed down by the fan. The hot air goes from the side of the furnace body to the other side, which will make the temperature on the left and right sides of the drying room uneven.

[0003] Secondly, when the burner is burning, the temperature of the hot air it generates will also change as the amount of biomass fuel inside the burner changes, resulting in a relatively wide temperature variation range in the drying room. This makes it difficult for staff to estimate the time required for drying, nor is it convenient for staff to estimate the drying degree of crops, affecting the drying quality of crops.

[0004] Furthermore, since the existing drying room only starts to dehumidify and ventilate after the internal humidity exceeds the set value, ventilation will lower the temperature inside the drying room, which will not only further expand the temperature variation range of the drying room, but also cause greater changes in the humidity inside the drying room, further affecting the staff's judgment on the drying of crops. Summary of the Invention

[0005] This application proposes a biomass fuel drying room for agricultural products. The flue gas circulates in the drying room, making the temperature in the drying room more uniform and improving the drying quality. At the same time, when the temperature is too high, moisture is removed and ventilation is carried out to control the changes in temperature and humidity in the drying room within a smaller range, making it easier for staff to accurately judge the drying status.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a biomass fuel drying room for agricultural products, comprising a drying chamber, a burner is provided on one side of the drying chamber, a hot air pipe is connected to the upper end of the burner, a heating channel is provided above the drying chamber, the hot air pipe is bent at the top and passes through the heating channel to be connected to an exhaust fan on one side, the exhaust fan is connected to an exhaust gas treatment component, a collecting chamber is provided on the side of the drying chamber away from the burner, the collecting chamber is connected to the heating channel, and a fan for blowing air into the drying chamber is provided on the side of the collecting chamber near the middle.

[0007] Furthermore, a mixing box is provided on the hot air pipe, which divides the hot air pipe into two sections, a front connector and a rear connector. A mixing chamber is provided in the mixing box, and a mixing hole is provided on the mixing box that can connect the two sides of the mixing box. The mixing hole is not connected to the mixing chamber, and the front connector and the rear connector are both connected to the mixing chamber, and the connection with the mixing box is sealed.

[0008] Furthermore, the front connector is closer to the burner than the rear connector, and a connecting pipe is provided between the rear connector and the front connector. The connecting pipe is fixedly connected to the rear connector, and the outer diameter of the connecting pipe is smaller than the inner diameter of the front connector. The connecting pipe is inserted into the front connector from the end of the front connector, and the front connector and the connecting pipe are coaxial. After the connecting pipe is inserted into the front connector, a gap is left between the connecting pipe and the front connector. The mixing chamber is connected to a secondary hot gas pipe, and the secondary hot gas pipe is connected to the exhaust fan.

[0009] Furthermore, a temperature sensor is provided in the heating channel, an air inlet is provided on the side wall of the heating channel, a dehumidification port is provided on the mixing box, a control valve and a one-way valve are provided on the dehumidification port, and when the control valve on the dehumidification port is opened, air can flow into the mixing box through the dehumidification port, and when the temperature sensor detects that the temperature in the heating channel is higher than the set value k1, the dehumidification port is triggered to open.

[0010] Furthermore, the air inlet is arranged between the exhaust fan and the mixing box, and the moisture outlet is located between the mixing box and the burner.

[0011] Furthermore, the control valve opening on the dehumidification port has n gears. When the temperature detected by the temperature sensor is greater than the set value k1, the control valve is opened at the lowest gear. The temperature sensor collects the temperature in the heating channel once every t time. If the temperature collected by the temperature sensor is greater than k1, the opening gear of the control valve increases by 1 until the control valve is opened to the maximum. If the temperature collected by the temperature sensor is less than k2, the opening gear of the control valve decreases by 1 until the control valve is completely closed. k, k1, k2, and K are temperature values ​​input by the staff according to the crop drying requirements, and k and K are the minimum and maximum temperatures of the drying chamber.

[0012] Furthermore, a dehumidification channel is provided on one side of the heating channel, the dehumidification channel is located between the mixing box and the burner, and the dehumidification port is located in the dehumidification channel.

[0013] Furthermore, a humidity sensor is provided in the heating channel, and the humidity sensor is located on a side close to the burner. When the humidity collected by the humidity sensor is greater than a set value h, the control valve of the moisture discharge port is controlled to open to the highest level.

[0014] Beneficial effects of the present invention:

[0015] The present application provides an agricultural product biomass fuel drying room, in which air circulates in the drying room. The air involved in the drying is fully heated by the hot air pipe, so that the temperature of the hot air contacted by each shelf tends to be consistent, thereby improving the drying quality.

[0016] Dehumidification and ventilation when the temperature is too high can control the temperature and humidity changes in the drying room to a smaller range, making it easier for workers to accurately judge the drying status of crops and ensure drying quality. It also avoids sudden temperature changes during dehumidification and ventilation, further ensuring the drying quality of crops. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute a part of the specification, illustrate the embodiments disclosed in the present application and, together with the description, serve to explain the principles of the embodiments disclosed in the present application.

[0018] The embodiments disclosed in this application may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the mixing box and the gas pipe in the present invention;

[0021] Figure 3 A side view of the mixing box and the gas pipe of the present invention;

[0022] Figure 4 For the present invention Figure 1 Left view of the (external wall omitted);

[0023] Figure 5 For the present invention Figure 1 Right view of the building (external walls omitted).

[0024] In the figure, 1. drying chamber; 2. burner; 3. heating channel; 4. hot air pipe; 41. front connector; 42. rear connector; 43. connecting pipe; 5. collecting chamber; 6. fan; 7. exhaust fan; 8. exhaust gas treatment component; 9. humidity sensor; 10. air inlet; 11. mixing box; 111. mixing chamber; 112. mixing hole; 12. dehumidification port; 13. auxiliary hot air pipe; 14. temperature sensor; 15. dehumidification channel. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application. Example 1:

[0026] See also Figure 1 , a biomass fuel drying room for agricultural products, including a drying chamber 1, a burner 2 is provided on one side of the drying chamber 1, a hot air pipe 4 is connected to the upper end of the burner 2, a heating channel 3 is provided above the drying chamber 1, the hot air pipe 4 is bent at the top and passes through the heating channel 3 and is connected to an exhaust fan 7 on one side, the exhaust fan 7 can be on the same side as the burner 2 or on a different side from the burner 2. In this embodiment, the hot air pipe 4 is bent twice, the exhaust fan 7 is on the same side as the burner 2, and the exhaust fan 7 is connected to an exhaust gas treatment component 8. The hot air is discharged after being treated by the exhaust gas treatment component 8. It flows along the hot air pipe 4 and heats the air in the heating channel 3 when flowing through the heating channel 3. The exhaust fan 7 draws the hot air out of the hot air pipe 4 and transports the hot air to the exhaust gas treatment component 8 to filter out harmful smoke before being discharged. A collecting chamber 5 is provided on the side of the drying chamber 1 away from the burner 2. The collecting chamber 5 is connected to the heating channel 3. A fan 6 is provided on the side of the collecting chamber 5 near the middle. The fan 6 blows the hot air in the collecting chamber 5 to make the air flow to the drying rack in the drying chamber 1 and return to the heating channel 3 on the side where the burner 2 is located, forming an air heating and drying cycle.

[0027] In this embodiment, the hot air first heats the wall of the hot air pipe 4, which then heats the surrounding air. Since the air and the hot air pipe 4 are in the same direction, the air will flow along the wall of the hot air pipe 4. The temperature of the air flowing along the outside of the wall will rise, while the temperature of the hot air flowing along the inside of the wall will drop. The temperature difference between the inside and outside is reduced, which affects the heat transfer efficiency and the utilization efficiency of the hot air.

[0028] To this end, in this embodiment, see Figure 2 and Figure 3 The hot air pipe 4 is provided with a mixing box 11. The number of the mixing box 11 is the same as the number of bends of the hot air pipe 4. In this embodiment, the hot air pipe 4 is bent twice, and there are two groups of mixing boxes. Figure 2The mixing box 11 is connected together and separated by a partition in the middle. The mixing box 11 divides the hot air pipe 4 into multiple sections. Each section of the hot air pipe 4 is connected to a front connector 41 or a rear connector 42. A mixing chamber 111 is provided in the mixing box 11. A mixing hole 112 is provided on the mixing box 11 to connect the two sides of the mixing box 11. The mixing hole 112 is not connected to the mixing chamber 111. The front connector 41 and the rear connector 42 are both connected to the mixing chamber 111 and the connection with the mixing box 11 is sealed. When the air flows, the air near the hot air pipe 4 is The mixing box 11 blocks the air away from the hot air pipe 4 and passes through the mixing hole 112 first, while the air flowing along the hot air pipe 4 is blocked by the mixing box 11. Under the action of the mixing chamber 111, the air in the heating channel 3 is mixed. After passing through the mixing box 11, the air temperature near the hot air pipe 4 decreases. At the same time, the hot air in the hot air pipe 4 is also mixed once in the mixing chamber 111. The temperature of the hot air near the side wall of the hot air pipe 4 rises, and the temperature difference between the inside and outside of the side wall of the hot air pipe 4 increases, thereby increasing the heat conduction efficiency and the utilization efficiency of the hot air.

[0029] The front connector 41 is connected to the upstream segment of the hot gas pipe 4, and the rear connector 42 is connected to the downstream segment of the hot gas pipe 4. The rear connector 42 is fixedly connected to the connecting pipe 43. The inner diameters of the front connector 41 and the hot gas pipe 4 are the same, and the outer diameter of the connecting pipe 43 is smaller than the inner diameter of the front connector 41. The connecting pipe 43 is inserted into the front connector 41 from the end thereof. The front connector 41 and the connecting pipe 43 are coaxial. After the connecting pipe 43 is inserted into the front connector 41, it is connected to the front connector 41. There is a gap between them. When the hot air passes through the front connecting head 41, the hot air cooled at the periphery is peeled off from the gap between the front connecting head 41 and the connecting pipe 43 and enters the mixing chamber 111. The other hot air has a higher temperature and directly enters the rear connecting head 42 through the connecting pipe 43. The mixing chamber 111 is connected to the auxiliary hot air pipe 13, and the auxiliary hot air pipe 13 is connected to the downstream mixing box 11 or the exhaust fan 7. The cooled hot air flows into the downstream mixing box 11 or the exhaust fan 7 through the auxiliary hot air pipe 13.

[0030] When the humidity in the existing drying room is higher than the set value, the temperature in the drying room will drop sharply after dehumidification and ventilation, which will affect the judgment of the staff on the drying process and the drying quality. Figure 1-Figure 5, a temperature sensor 14 is provided in the heating channel 3. An air inlet 10 is provided on the side wall of the heating channel 3. The air inlet 10 is provided between the exhaust fan 7 and the mixing box 11. A control valve and a check valve are provided on the air inlet 10. When the control valve is opened, external air can flow unidirectionally into the heating channel 3 through the air inlet 10. A moisture exhaust port 12 is provided on the mixing box 11. A control valve and a check valve are provided on the moisture exhaust port 12. When the control valve on the moisture exhaust port 12 is opened, air can flow into the mixing box 11 through the moisture exhaust port 12. The moisture exhaust port 12 is located between the mixing box 11 and the burner 2. When the temperature sensor 14 detects that the temperature in the heating channel 3 is higher than the set value k1, the moisture exhaust port 12 and the air inlet 10 are triggered to open. Since the hot air temperature generated by the burner 2 varies within a range with the intermittent addition of biofuel, when the temperature in the heating channel 3 is relatively high, the air inlet 10 and the moisture exhaust port 12 are opened for appropriate moisture removal and ventilation. On the one hand, the temperature and humidity of the air in the heating channel 3 are controlled to narrow the variation range of temperature and humidity. At the same time, because the air circulates, the high-temperature air flows into the heating channel 3 from the side close to the burner 2 and flows out of the heating channel 3 from the side close to the collecting chamber 5. Therefore, the air humidity on the side close to the burner 2 is high, and the air temperature on the side close to the collecting chamber 5 is high. Therefore, the moisture exhaust port 12 is provided on the side close to the burner 2, and the air inlet 10 is provided on the side close to the collecting chamber 5, which can ensure that the discharged air has the highest humidity and ensure that the temperature of the air finally used for drying will not be too low.

[0031] The opening degree of the control valve on the moisture exhaust port 12 has n gears, and the value of n is 3 - 5. When the temperature detected by the temperature sensor 14 is greater than the set value k1, the control valve is opened with the lowest gear opening degree. The temperature sensor 14 collects the temperature in the heating channel 3 every t time, and t is 1 - 3 min. If the temperature collected by the temperature sensor 14 is greater than k1, the opening gear of the control valve increases by 1 until the control valve is opened to the maximum. If the temperature collected by the temperature sensor 14 is less than k2, the opening gear of the control valve decreases by 1 until the control valve is completely closed. k < k2 < k1 < K, and k, k2, k1, K are temperature values input by the staff according to the requirements of crop drying. k and K are the lowest and highest temperatures of the drying chamber. Before the fuel in the burner is not fully burned, if the opening degree of the air inlet 10 is adapted to the hot air, the temperature will remain between k2 and k1. The air inlet 10 maintains the maximum opening degree. The opening degree of the moisture exhaust port 12 determines the amount of air sucked out of the drying chamber, and thus determines the amount of newly supplemented air. Although in this embodiment, it is expected that all newly supplemented air is supplemented into the drying chamber from the air inlet 10, since the drying chamber is not completely sealed, as long as it is ensured that most of the newly supplemented air is supplemented into the drying chamber from the air inlet 10.

[0032] A dehumidification channel 15 is provided on one side of the heating channel 3. The dehumidification channel 15 is located between the mixing box 11 and the burner 2. The dehumidification port 12 is located in the dehumidification channel 15. During dehumidification, the air in the dehumidification channel 15 is discharged first. Since the dehumidification channel 15 is located on one side, the heat absorbed during the flow in the heating channel 3 is relatively small, reducing heat waste.

[0033] A humidity sensor 9 is provided in the heating channel 3 and is located on the side close to the burner 2. When the humidity collected by the humidity sensor 9 is greater than the set value h, the control valve of the moisture drain port 12 is controlled to open to the highest gear to maintain the fastest moisture drain speed to ensure that the humidity in the drying room is always within a reasonable range.

[0034] The staff puts the crops on the shelves in the drying room, and then inputs the temperature range, the optimal temperature range and the maximum humidity value according to the crop drying requirements, and turns on the burner 2. The biomass fuel burns in the burner 2 to generate hot air, which flows in the hot air pipe 4 and is sucked out by the exhaust fan 7. The flue gas is discharged after being treated by the exhaust gas treatment component 8. When the hot air flows in the hot air pipe 4, the air in the heating channel 3 flows along the hot air pipe 4 under the action of the fan 6. The air gradually absorbs heat and is heated. When the air flows to the mixing box 11, the air flowing along the hot air pipe 4 is blocked and separated from the hot air pipe 4. The air is mixed when passing through the mixing hole 112. After passing through the hot air pipe 4, the temperature of the air close to the hot air pipe 4 decreases. When the flue gas passes through the mixing box 11, the air close to the inner wall of the hot air pipe 4 is stripped off. After passing through the mixing box 11, the temperature of the air close to the inner wall of the hot air pipe 4 increases, increasing the temperature difference between the inner and outer walls of the hot air pipe 4 and improving the heat exchange efficiency.

[0035] As the burner fuel is fully burned, the hot gas temperature gradually increases. When the temperature is too high, the dehumidification port 12 opens, and the moisture enters through the mixing box 11 and mixes with the flue gas in the mixing box 11, and is finally discharged by the exhaust fan 7. The pressure in the heating channel 3 is reduced, and fresh air enters the air inlet 10, which controls the humidity in the heating channel 3 and also controls the temperature in the drying chamber within a smaller range.

Claims

1. An agricultural product biomass fuel drying room, comprising a drying chamber (1), a burner (2) provided on one side of the drying chamber (1), a hot air pipe (4) connected to the upper end of the burner (2), characterized in that: A heating channel (3) is provided above the drying chamber (1). The hot air pipe (4) is bent at the top and passes through the heating channel (3) to be connected to an exhaust fan (7) on one side. The exhaust fan (7) is connected to an exhaust gas treatment component (8). A collecting chamber (5) is provided on the side of the drying chamber (1) away from the burner (2). The collecting chamber (5) is communicated with the heating channel (3). A fan (6) for blowing air into the drying chamber (1) is provided on the side of the collecting chamber (5) near the middle. A mixing box (11) is provided on the hot air pipe (4). The mixing box (11) is bent the same number of times as the hot air pipe (4). The mixing box (11) divides the hot air pipe (4) into multiple sections. Each section of the hot air pipe (4) is respectively connected to a front connector (41) or a rear connector (42). A mixing chamber (111) is provided in the mixing box (11). A mixing hole (112) capable of communicating with both sides of the mixing box (11) is provided on the mixing box (11). The mixing hole (112) It is not connected to the mixing chamber (111), the front connector (41) and the rear connector (42) are both connected to the mixing chamber (111), and the connection with the mixing box (11) is sealed, the front connector (41) is connected to the upstream segment of the hot air pipe (4), the rear connector (42) is connected to the downstream segment of the hot air pipe (4), the rear connector (42) is fixedly connected to the connecting pipe (43), the front connector (41) and the hot air pipe (4) have the same inner diameter, and the connection The outer diameter of the tube (43) is smaller than the inner diameter of the front connector (41). The connecting tube (43) is inserted into the front connector (41) from the end of the front connector (41). The front connector (41) and the connecting tube (43) are coaxial. After the connecting tube (43) is inserted into the front connector (41), a gap is left between the connecting tube (43) and the front connector (41). The mixing chamber (111) is connected to the auxiliary hot air pipe (13), and the auxiliary hot air pipe (13) is connected to the downstream mixing box (11) or the exhaust fan (7).

2. The agricultural product biomass fuel drying room according to claim 1, characterized in that: A temperature sensor (14) is provided in the heating channel (3), an air inlet (10) is provided on the side wall of the heating channel (3), a dehumidification port (12) is provided on the mixing box (11), and a control valve and a one-way valve are provided on the dehumidification port (12). When the control valve on the dehumidification port (12) is opened, air can flow into the mixing box (11) through the dehumidification port (12). When the temperature sensor (14) detects that the temperature in the heating channel (3) is higher than a set value k1, the dehumidification port (12) is triggered to open.

3. The agricultural product biomass fuel drying room according to claim 2, characterized in that: The air inlet (10) is provided between the exhaust fan (7) and the mixing box (11), and the moisture outlet (12) is located between the mixing box (11) and the burner (2).

4. The agricultural product biomass fuel drying room according to claim 2, characterized in that: The control valve opening on the dehumidification port (12) has n gears. When the temperature detected by the temperature sensor (14) is greater than the set value k1, the control valve is opened at the lowest gear opening. The temperature sensor (14) collects the temperature in the heating channel (3) every t time. If the temperature collected by the temperature sensor (14) is greater than k1, the opening gear of the control valve is increased by 1 until the control valve is opened to the maximum. If the temperature collected by the temperature sensor (14) is less than k2, the opening gear of the control valve is reduced by 1 until the control valve is completely closed. k, k2, k1, and K are temperature values ​​input by the staff according to the crop drying requirements. k and K are the lowest temperature and the highest temperature of the drying chamber.

5. The agricultural product biomass fuel drying room according to claim 4, characterized in that: A dehumidification channel (15) is provided on one side of the heating channel (3). The dehumidification channel (15) is located between the mixing box (11) and the burner (2). The dehumidification port (12) is located in the dehumidification channel (15).

6. The agricultural product biomass fuel drying room according to claim 5, characterized in that: A humidity sensor (9) is provided in the heating channel (3), and the humidity sensor (9) is located on a side close to the burner (2). When the humidity collected by the humidity sensor (9) is greater than a set value h, the control valve of the moisture discharge port (12) is controlled to open to the highest level.

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