Grain drying apparatus with waste heat recovery

Abstract

The utility model discloses a kind of grain drying equipment of waste heat recovery, it is related to grain drying technical field, including drying cabinet, heat discharge passage and heat circulation mechanism, the heat is transported between the drying cabinet and grain storage tank by heat transport passage, excess heat is discharged along heat discharge passage, heat discharge passage is connected with heat circulation mechanism, preheating passage, air inlet and air outlet are provided on heat circulation mechanism, fan is installed outside heat circulation mechanism, the position of fan is opposite to preheating passage, and suction pump is provided in heat circulation mechanism, the connecting port of suction pump is opposite to heat discharge passage. The utility model is discharged from heat discharge passage by the excess hot air after grain is dried, connect it with heat circulation mechanism, so that excess heat is recycled by heat circulation mechanism and reused, hot air after recovery can be preheated between drying to grain drying cabinet, improve the effect of drying.

Description

Technical Field

[0001] This utility model relates to the field of grain drying technology, specifically to a grain drying device with waste heat recovery. Background Technology

[0002] Traditionally, after grains are collected, they need to be dried, crushed, and polished. The drying process generates a lot of heat, which, if released directly, will put pressure on the environment and cause excessively high temperatures in the factory, leading to worker discomfort.

[0003] Existing grain drying equipment directly discharges excess heat or post-drying heat after the drying process, causing environmental pressure. For example, the waste heat recovery circulating energy-saving dryer disclosed in patent announcement number CN208887338U has a body structure consisting of an upper flow pipe, an upper tempering section, a waste heat drying section, a lower tempering section, a recovery air chamber, a drying section, a grain discharge mechanism, a lower flow trough, a base support (13), an exhaust port, a suction fan, and an air inlet. The waste heat drying section continuously utilizes the waste heat recovered from the drying section to dry the grain. This drying method utilizes residual heat without increasing the heat supply, increasing the rice drying rate by approximately 0.2% / h, resulting in significant energy savings. It reduces the unit heat consumption for grain drying, saving about 20% of energy compared to similar dryers that do not recover heat. This solves the problems of high fuel consumption, high energy consumption, slow drying, low drying rate, and high drying cost associated with ordinary circulating dryers, achieving energy saving and environmental protection. It is widely used for grain and seed drying. However, the recovered heat in this method cannot be reused, nor can it be used to preheat the drying chamber or lower the operating room temperature.

[0004] Therefore, it is necessary to invent a grain drying device that recovers waste heat to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a grain drying device with waste heat recovery, in order to solve the problem that the excess heat after grain drying cannot be recovered and reused, resulting in environmental pollution and energy waste.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A grain drying device for waste heat recovery includes a drying chamber, a heat discharge channel, and a heat circulation mechanism. Heat is transferred between the drying chamber and the grain storage chamber through a heat transmission channel. Excess heat is discharged along the heat discharge channel. The heat discharge channel is connected to the heat circulation mechanism, which is equipped with a preheating channel, an air inlet, and an air outlet. A fan is installed outside the heat circulation mechanism, and the fan is positioned opposite the preheating channel. An air pump is installed inside the heat circulation mechanism, and the air pump is connected to the heat discharge channel.

[0008] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0009] 1. This utility model discharges excess heat from the grain after drying through a heat exhaust channel and connects it to a heat circulation mechanism, so that the excess heat can be recovered and reused by the heat circulation mechanism. The recovered heat can preheat the grain drying box before drying, thereby improving the drying effect.

[0010] 2. In the preheating process, the present invention utilizes a fan to blow open the one-way valve, thereby straightening the baffle mechanism into a straight line, which acts as a baffle to ensure unidirectional heat transfer.

[0011] 3. This utility model uses a condenser tube in the heat circulation mechanism to cool the hot air, thereby reducing the temperature in the operating room or factory and making the working environment more comfortable for workers. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a three-dimensional structural diagram of the thermal circulation mechanism of this utility model;

[0014] Figure 3 This is a three-dimensional exploded view of the thermal circulation mechanism of this utility model;

[0015] Figure 4 This is a three-dimensional structural diagram of the U-shaped tube of this utility model;

[0016] Figure 5 This is a schematic diagram of the connection structure of the one-way valve of this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Drying box; 2. Grain storage box; 3. Heat transfer channel; 4. Heat discharge channel; 5. Heat circulation mechanism; 501. U-shaped tube; 502. Heat exchange tube; 503. Condenser tube; 6. Preheating channel; 601. One-way valve; 602. Connecting rod; 603. Limiting element; 604. Baffle mechanism; 7. Air inlet; 8. Air outlet. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] This utility model provides, for example Figures 1 to 5The grain drying equipment with waste heat recovery shown includes a drying chamber 1, a heat discharge channel 4, and a heat circulation mechanism 5. Heat is transferred between the drying chamber 1 and the grain storage chamber 2 through a heat transfer channel 3. Excess heat is discharged along the heat discharge channel 4. The heat discharge channel 4 is connected to the heat circulation mechanism 5. The heat circulation mechanism 5 is provided with a preheating channel 6, an air inlet 7, and an air outlet 8. A fan is installed outside the heat circulation mechanism 5, and the position of the fan is opposite to the preheating channel 6. An air pump is provided inside the heat circulation mechanism 5, and the air pump is opposite to the connection port of the heat discharge channel 4.

[0020] After the drying chamber 1 delivers heat to the grain storage chamber 2 to dry the grain, the excess heat is recovered and reused by the heat exhaust channel 4 and the heat circulation mechanism 5. This can preheat the grain storage chamber 2 and reduce the temperature in the operating room and circulate the air.

[0021] A U-shaped tube 501 is installed inside the heat circulation mechanism 5. The top opening of the U-shaped tube 501 faces the air inlet 7, and the bottom opening of the U-shaped tube 501 extends to the air outlet 8. A heat exchange tube 502 and a condenser tube 503 are provided inside the heat circulation mechanism 5. The heat exchange tube 502 and the condenser tube 503 are arranged in parallel, and the heat exchange tube 502 is located in the middle of the preheating channel 6.

[0022] The heat exchange tube 502 in the heat circulation mechanism 5 can recover and reuse the dried hot air, and the heat with a temperature lower than the drying temperature can be transported into the grain storage box 2 through the preheating channel 6 to preheat the grain storage box 2.

[0023] A one-way valve 601 is installed in the preheating channel 6. The bottom of the one-way valve 601 is hinged to the connecting rod 602, and the connecting rod 602 passes through the partition mechanism 604 in sequence. The partition mechanism 604 includes fixed frames on both sides and multiple rectangular plates distributed between the fixed frames on both sides and rotatable around the connection with the fixed frames. Each of the multiple rectangular plates has a hole with a diameter 2-3 times that of the connecting rod 602. A limiting member 603 is provided at the position close to the hole. The limiting member 603 is connected to the multiple rectangular plates. The length of the limiting member 603 is greater than the diameter of the hole. The limiting member 603 is hinged to the connecting rod 602, and the distance between each limiting member 603 is equal to the distance between the rectangular plates of each partition mechanism 604. The size of the partition mechanism 604 matches the size of the heat exchange tube 502 and the condenser tube 503. The partition mechanism 604 is set between the heat exchange tube 502 and the condenser tube 503. The condenser tube 503 is set at the bottom of the heat circulation mechanism 5.

[0024] When the preheating channel 6 delivers heat to the grain storage box 2 for preheating, the fan will blow the connecting rod 602 open, straightening the baffle mechanism 604 to act as a baffle, blocking the bottom condenser pipe 503 and preventing it from affecting the temperature of the heat.

[0025] During operation, heat is generated by heating wires or heating mechanisms inside the drying chamber 1. The heat is then transferred into the grain storage chamber 2 to dry the grain inside the grain storage chamber 2. Excess heat is discharged through the heat discharge channel 4.

[0026] The discharged heat gas is recovered into the heat circulation mechanism 5 along the heat discharge channel 4. The temperature of the recovered heat is lower than the temperature of the heating. The recovered heat gas is transported into the grain storage box 2 along the preheating channel 6 by the operation of the fan, so as to achieve the effect of preheating the grain storage box 2 before drying.

[0027] While preheating, the fan blows air into the preheating channel 6, opening the one-way valve 601 and driving the connecting rod 602, causing multiple originally vertical baffle mechanisms 604 to be straightened into a straight line. When the one-way valve 601 closes, the horizontal baffle mechanism 604 resets, forming a baffle effect, so that the heat circulation mechanism 5 only delivers hot air and is not affected by the condenser pipe 503, thus reducing the temperature. By starting the pump at the top of the outlet 8, the air at the inlet 7 is drawn in (when the temperature in the operating room is too high), and the hot air is drawn to the outlet 8 through the U-shaped pipe 501, flowing through the condenser pipe 503, so that the cooled gas is output from the outlet 8, reducing the temperature in the operating room.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grain drying apparatus with waste heat recovery, characterized by: It includes a drying box (1), a grain storage box (2) and a heat discharge channel (4). The drying box (1) and the grain storage box (2) are connected by a heat transfer channel (3). Excess heat is discharged along the heat discharge channel (4). A heat circulation mechanism (5) is connected to the heat discharge channel (4). The heat circulation mechanism (5) is provided with a preheating channel (6), an air inlet (7) and an air outlet (8). A fan is installed outside the heat circulation mechanism (5). The position of the fan is opposite to the preheating channel (6). An air pump is provided inside the heat circulation mechanism (5). The air pump is opposite to the connection port of the heat discharge channel (4).

2. A grain drying apparatus with waste heat recovery as claimed in claim 1, wherein: The heat circulation mechanism (5) is equipped with a U-shaped tube (501), the top opening of the U-shaped tube (501) faces the air inlet (7), and the bottom opening of the U-shaped tube (501) extends to the air outlet (8).

3. The grain drying equipment with waste heat recovery according to claim 2, characterized in that: The heat circulation mechanism (5) is provided with a heat exchange tube (502) and a condenser tube (503). The heat exchange tube (502) and the condenser tube (503) are arranged in parallel, and the heat exchange tube (502) is located in the middle of the preheating channel (6).

4. The waste heat recovery grain drying apparatus of claim 1, wherein: A one-way valve (601) is installed in the preheating channel (6). The bottom of the one-way valve (601) is connected to the connecting rod (602), and the connecting rod (602) passes through the partition mechanism (604) in sequence.

5. A grain drying apparatus for recovering waste heat according to claim 4, wherein: The partition mechanism (604) is composed of multiple rotatable rectangular plates, and each of the rectangular plates has a hole, with a limit member (603) placed in close contact with the hole.

6. A grain drying apparatus for recovering waste heat according to claim 5, wherein: The length of the limiting member (603) is greater than the diameter of the hole.

7. A grain drying apparatus for recovering waste heat according to claim 5, wherein: The distance between each limiting member (603) is equal to the distance between the rectangular plates of each partition mechanism (604), and the size of the partition mechanism (604) matches the size of the heat exchange tube (502) and the condenser tube (503).

8. A grain drying apparatus with waste heat recovery as claimed in claim 7, wherein: The partition mechanism (604) is disposed between the heat exchange tube (502) and the condenser tube (503), and the condenser tube (503) is disposed at the bottom of the heat circulation mechanism (5).

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