A grain drying waste heat recovery evaporation box

Abstract

The utility model relates to the technical field of grain processing production, and disclose a kind of waste heat recovery evaporation tank for grain drying, including evaporation tank box, the evaporation tank box one end two two symmetrical rotation installation has evaporation tank door, the utility model is provided with waste heat recovery tank and heat exchange pipe body, can effectively recover high-temperature waste heat generated in the process of grain drying, and it is used for heating water and other media, and the water medium after heating can be used in other production links of enterprise, such as heating, hot water supply etc., greatly improve energy utilization efficiency, reduce the energy consumption cost of enterprise, simultaneously by being provided with telescopic air cylinder, rotary motor and cleaning brush structure, the outer wall of heat exchange pipe body can be effectively cleaned, avoid the case of preventing dust and other impurities from adhering on heat exchange pipe body and affecting heat exchange effect, further improve the service life of heat exchange pipe body.

Description

Technical Field

[0001] This utility model relates to the field of grain processing and production technology, specifically to a waste heat recovery evaporator for grain drying. Background Technology

[0002] An evaporator is a device that uses the principle of evaporative cooling or heat exchange to regulate air temperature and humidity or recover heat energy. By scientifically controlling drying parameters, it can efficiently reduce moisture while maximizing the preservation of grain quality and nutritional value. Modern drying technology is developing towards intelligence and green energy saving, and is widely used in grain drying, air conditioning systems, industrial cooling and other fields.

[0003] The waste heat recovery evaporator in grain drying is an energy-saving device. It is mainly used to recover the waste heat in the hot and humid exhaust gas discharged during the drying process and reuse it to improve energy efficiency and reduce drying costs. It is usually installed on the waste heat emission channel of the grain drying system. Its main function is to use the waste heat in the high-temperature exhaust gas discharged during the drying process to heat water or other working fluids to boiling point and evaporate them, thereby converting the heat energy in the exhaust gas into the heat energy of steam and realizing the recovery and reuse of waste heat.

[0004] Because grain evaporation boxes generate a large amount of heat during the evaporation and drying process of the grain, this heat can be used to heat the water inside through heat exchange tubes for employee washing and winter heating, thus saving costs in grain processing and reducing unnecessary energy waste. However, existing grain drying waste heat recovery evaporation boxes contain a large amount of dust in the waste gas after grain drying. During the waste heat recovery process, a large amount of dust easily adheres to the surface of the heat exchange tubes, causing the heat exchange efficiency to continuously decrease, affecting the stability of waste heat recovery, and further reducing the waste heat recovery efficiency of the grain drying waste heat recovery evaporation box. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the shortcomings of the prior art, this utility model provides a waste heat recovery evaporator for grain drying, which solves the technical problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery evaporator for grain drying, comprising an evaporator body, evaporator doors symmetrically and rotatably installed at one end of the evaporator body, symmetrical blowers fixedly installed on both sides of the evaporator body near the lower end, a waste heat recovery box fixedly installed at the upper end of the evaporator body, a plurality of evaporation heating tubes evenly spaced on the inner side of the evaporator body near the bottom end, a plurality of placement mesh plates inserted and installed along the height direction on the inner side of the evaporator body, a hot air gathering hood fixedly installed at the top of the inner side of the evaporator body, a hot air inlet duct connected and installed at the center of one side of the waste heat recovery box near the upper end of the hot air gathering hood, a hot air outlet duct fixedly installed at the center of the other side of the waste heat recovery box, a heat exchange tube fixedly installed at the center of the inner side of the waste heat recovery box, and a cleaning brush movably installed on the outer wall of the waste heat recovery box close to the heat exchange tube.

[0009] Preferably, a heat exchanger inlet valve is fixedly installed at one side of the upper center of the waste heat recovery box, and a heat exchanger outlet valve is fixedly installed at the lower end of one side of the waste heat recovery box near the hot air outlet duct.

[0010] Preferably, each of the outer walls of the circular slide rod is symmetrically equipped with a sliding seat in pairs, and each of the upper center of the sliding seat and the nut seat is fixedly equipped with a symmetrical portal support block in pairs.

[0011] Preferably, each square sliding block has two symmetrical limiting sliding rods installed vertically on the side closest to the threaded screw, and a drive motor is fixedly installed at the center of the upper end of each portal support block, with the output end of the drive motor connected to the threaded screw.

[0012] Preferably, buffer bases are symmetrically installed at both ends of one side of the irregularly shaped pad, and a buffer cylinder is fixedly installed at the center of each buffer base. A spring is telescopically installed at the center of the inner side of each buffer cylinder, and a convex buffer block is fixedly installed on one side of each spring.

[0013] Preferably, each of the convex buffer blocks has two symmetrical irregular mounting plates installed on one side, and each of the irregular mounting plates has several vacuum suction cups installed at equal intervals on one side. A magnetic recess is fixedly installed at the center of one side of the irregular pad, and a magnetic protrusion is fixedly installed at the center of the other side of the irregular mounting plate.

[0014] (III) Beneficial Effects

[0015] Compared with the prior art, this utility model provides a waste heat recovery evaporator for grain drying, which has the following beneficial effects:

[0016] 1. By setting up a waste heat recovery box and heat exchange tubes, the high-temperature waste heat generated during the grain drying process can be effectively recovered and used to heat water and other media. The heated water can be used in other production processes of the enterprise, such as heating and hot water supply, which greatly improves energy utilization efficiency and reduces the energy consumption cost of the enterprise.

[0017] 2. By incorporating a telescopic cylinder, a rotary motor, and a cleaning brush structure, the outer wall of the heat exchange tube can be effectively cleaned, preventing dust and other impurities from adhering to the heat exchange tube and affecting the heat exchange effect, thus further improving the service life of the heat exchange tube. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the evaporator box of this utility model;

[0020] Figure 2 This is a schematic diagram showing the internal structure of the evaporator box of this utility model.

[0021] Figure 3 This is a schematic diagram showing the internal structure of the waste heat recovery box in this practical application.

[0022] Figure 4 This is an enlarged schematic diagram of the cleaning mechanism structure of this utility model.

[0023] The labels in the diagram represent: 1. Evaporator box body; 2. Evaporator box door; 3. Blower; 4. Waste heat recovery box body; 5. Evaporator heating tube; 6. Placement mesh plate; 7. Hot air gathering hood; 8. Hot air inlet duct; 9. Hot air outlet duct; 10. Heat exchanger tube inlet valve; 11. Heat exchanger tube outlet valve; 12. Heat exchanger tube body; 13. Telescopic cylinder; 14. Telescopic shaft; 15. Irregular mounting base; 16. Cleaning brush; 17. Cleaning scraper; 18. Rotary motor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0025] The present invention will be further described below with reference to the embodiments.

[0026] Example 1

[0027] Reference Figure 1-4 This is the first embodiment of the present invention, which provides a waste heat recovery evaporator for grain drying. The evaporator body 1 has symmetrically arranged evaporator doors 2 at one end, realizing a double-opening and sealed structure. The door frame should be equipped with a high-temperature resistant silicone sealing strip, and the opening angle is recommended to be designed to be 180° to facilitate loading and unloading of grain. The hinges are made of stainless steel to prevent damp heat corrosion, making it easy to put the grain to be dried into the evaporator body 1, and also easy to take out the grain after drying. The blowers 3 installed on both sides of the evaporator body 1 near the lower end are used to blow air into the evaporator body 1, so that the air inside the box can circulate better. Together with the evaporation heating tube 5, the grain placed on the placement mesh plate 6 is dried. The placement mesh plate 6 is a multi-layer removable design with a mesh size of less than 5mm and is made of 304 stainless steel perforated plate.

[0028] The evaporator body 1 is equipped with multi-level placement mesh plates 6 to achieve layered drying of grain. The heating pipe 5 and the blower 3 form forced convection heating. The waste heat recovery box 4 connected to the upper end of the evaporator body 1 is the key part to realize the waste heat recovery function. The hot air gathering hood 7 is installed on the top of the inner side of the evaporator body 1. The hot air gathering hood 7 adopts a conical structure and the cone angle is designed to achieve the best airflow gathering effect. It can gather the hot air generated in the evaporator body 1 and introduce it into the waste heat recovery box 4 through the hot air inlet duct 8. The hot air inlet duct 8 and the hot air outlet duct 9 are made of materials with good high temperature resistance to ensure smooth flow of hot air. The hot air inlet duct 8 and the hot air outlet duct 9 are covered with a 50mm thick rock wool insulation layer to reduce heat loss and facilitate waste heat recovery. Several placement mesh plates 6 are set along the height direction on the inner side of the evaporator body 1 to provide placement space for grain. The multi-level design increases the amount of grain that can be dried at one time.

[0029] Meanwhile, the structural design of the mesh plate 6 ensures that air can circulate freely between the mesh plates, improving drying efficiency. The evaporation heating tubes 5 are installed at equal intervals on the inner side of the evaporation box 1 near the bottom, which can generate heat to heat the air inside the box, thereby realizing the drying operation of the grain. The heat exchange tube 12 is made of high-efficiency heat exchange material, and water to be heated can circulate inside. When the hot air enters the waste heat recovery box 4, it exchanges heat with the medium inside the heat exchange tube 12, transferring the waste heat in the hot air to the medium, raising the temperature of the medium, and realizing the recovery and utilization of waste heat.

[0030] On the waste heat recovery box 4, the heat exchange tube inlet valve 10 and the heat exchange tube outlet valve 11 are located at the upper center of the waste heat recovery box 4 and at the lower end of the hot air outlet duct 9, respectively. The heat exchange tube inlet valve 10 is used to control the flow rate and on / off of the heat exchange water entering the heat exchange tube 12, while the heat exchange tube outlet valve 11 is used to control the outflow of the medium after heat exchange. Through these two valves, the circulation of the heat exchange medium during the waste heat recovery process can be effectively adjusted to achieve the best waste heat recovery effect.

[0031] A telescopic cylinder 13 is installed at the center of the upper end of the waste heat recovery box 4. The telescopic shaft 14 connected to the output end of the telescopic cylinder 13 can move up and down under the drive of the telescopic cylinder 13. The stroke of the telescopic shaft 14 of the telescopic cylinder 13 must cover the entire length of the heat exchange tube 12. At the same time, the telescopic cylinder 13 is a cylinder with a magnetic ring induction to achieve precise positioning. The irregularly shaped mounting seat 15 installed at the lower end of the telescopic shaft 14 cooperates with the concave limiting blocks on both sides of the waste heat recovery box 4 through the sliding blocks installed at the center of its two sides. The gap between the sliding block and the concave limiting block is less than 0.1mm to prevent the cleaning brush 16 from shaking during the cleaning process. This ensures the stability of the irregularly shaped mounting seat 15 during the lifting and lowering process, so that it can only move up and down along the trajectory defined by the concave limiting block.

[0032] Example 2

[0033] Reference Figure 1-4 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the rotating shaft rotatably installed at the center of one end of the inner side of the irregular mounting base 15, and the cleaning brush 16 installed around the outer wall of the rotating shaft at equal intervals, play an important role in the operation of the equipment. When the telescopic cylinder 13 drives the irregular mounting base 15 to descend, the cleaning brush 16 can closely adhere to the outer wall of the heat exchange tube 12. The bristles of the cleaning brush 16 are made of high-temperature resistant material of nylon 66 reinforced with carbon fiber. The bristle length is 10% longer than the heat exchange tube 12 to ensure complete contact with the heat exchange tube 12 and clean the dust, impurities and other substances attached to the surface of the heat exchange tube 12. The cleaning scraper 17 is fixedly installed at the lower end of the inner side of the irregular mounting base 15. The cleaning scraper 17 is made of polytetrafluoroethylene and the blade edge is at a 45° angle to the surface of the cleaning brush 16 to scrape off the sticky dust.

[0034] After the cleaning brush 16 has finished cleaning, the dust and other impurities scraped off by the cleaning brush 16 can be further collected and cleaned to prevent them from re-adhering to the heat exchange tube 12, thus ensuring the heat exchange efficiency of the heat exchange tube 12. The rotary motor 18 is installed at the center of one side of the irregular mounting base 15, and the rotary motor 18 and the telescopic cylinder 13 are matched in lifting speed to form a spiral cleaning trajectory. Its output end is connected to the rotating shaft, and the rotating shaft is equipped with a waterproof bearing, which can drive the rotating shaft and the cleaning brush 16 to rotate. The cleaning brush 16 rotates while moving up and down along the outer wall of the heat exchange tube 12, which greatly improves the cleaning effect. A dust collection drawer is inserted and installed at the bottom of the inner side of the waste heat recovery box 4. The dust collection drawer has a viewing window and a leak-proof slide rail at the bottom to collect the dust and impurities that have been cleaned off, which is convenient for regular cleaning and ensures the cleanliness of the inside of the waste heat recovery box 4, thereby maintaining the normal operation of the equipment.

[0035] The remaining structure is the same as that in Example 1.

[0036] The workflow of this utility model is as follows:

[0037] First, the grain to be dried is placed into the evaporator body 1 through the double-opening 180° evaporator door 2 on the multi-layer mesh plate 6. The blowers 3 at the lower ends of both sides of the evaporator body 1 blow air into the box, and the evaporation heating tube 5 starts to generate heat. At the same time, the blowers 3 blow air into the evaporator body 1 to form forced convection, so that the hot air is evenly distributed and dries the grain. The hot air is gathered by the hot air gathering cover 7 at the top of the inner side of the evaporator body 1 and introduced into the waste heat recovery box 4 through the hot air inlet duct 8. The hot air inlet duct 8 and the hot air outlet duct 9 are made of high temperature resistant material and covered with a 50mm thick rock wool insulation layer to reduce heat loss. The heat exchange tube 12 is located at the center of the inner side of the waste heat recovery box 4, and the water to be heated flows inside the heat exchange tube 12 to exchange heat with the incoming hot air to realize waste heat recovery. The heat exchange tube inlet valve 10 and the heat exchange tube outlet valve 11 control the circulation of the heat exchange medium.

[0038] Secondly, when it is necessary to clean the surface impurities of the heat exchange tube 12, the telescopic cylinder 13 at the center of the upper end of the waste heat recovery box 4 drives the telescopic shaft 14 to descend. The sliding blocks on both sides of the irregular mounting base 15 at the lower end of the telescopic shaft 14 slide in the concave limiting blocks on both sides inside the waste heat recovery box 4 to ensure stability. The rotating motor 18 inside the irregular mounting base 15 drives the rotating shaft and the cleaning brush 16 to rotate. The cleaning brush 16 is in close contact with the outer wall of the heat exchange tube 12. The high-temperature resistant bristles reinforced with nylon 66 and carbon fiber clean the dust and other impurities on its surface. The cleaning scraper 17 at the lower end of the inner side of the irregular mounting base 15 further collects the impurities scraped off by the cleaning brush 16. Its polytetrafluoroethylene cutting edge is at a 45° angle to the cleaning brush 16, which is convenient for scraping off the sticky dust.

[0039] Finally, the cleaned-off dust and impurities fall into the dust collection drawer installed at the bottom of the inner side of the waste heat recovery box 4. The drawer has a viewing window and a leak-proof slide rail at the bottom, which facilitates regular cleaning and maintains the normal operation of the equipment. After drying, the evaporator box door 2 is opened to take out the grain, completing the entire workflow.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste heat recovery evaporative bin for drying grain, characterised by: The device includes an evaporator body, with evaporator doors symmetrically and rotatably installed at one end of the evaporator body. Two symmetrical blowers are fixedly installed on both sides of the evaporator body near the lower end. A waste heat recovery chamber is fixedly installed at the upper end of the evaporator body. Several evaporation heating tubes are evenly spaced on the inner side of the evaporator body near the bottom. Several placement mesh plates are inserted and installed along the height direction on the inner side of the evaporator body. A hot air gathering hood is fixedly installed at the top inner side of the evaporator body. A hot air inlet duct is connected to the upper end of the hot air gathering hood at the center of one side of the waste heat recovery chamber. A hot air outlet duct is fixedly installed at the center of the other side of the waste heat recovery chamber. A heat exchange tube is fixedly installed at the center of the inner side of the waste heat recovery chamber. A cleaning brush is movably installed on the outer wall of the waste heat recovery chamber, close to the heat exchange tube.

2. The grain drying evaporative bin of claim 1, wherein: A heat exchanger inlet valve is fixedly installed at the center of the upper end of the waste heat recovery box, and a heat exchanger outlet valve is fixedly installed at the center of one side of the waste heat recovery box near the lower end of the hot air outlet duct.

3. The grain drying evaporative bin of claim 1, wherein: A telescopic cylinder is fixedly installed at the center of the upper end of the waste heat recovery box, and a telescopic shaft is connected to the output end of the telescopic cylinder.

4. The evaporative bin for drying grain according to claim 3, characterized in that: A non-circular mounting base is fixedly installed at the lower end of the telescopic shaft. Sliding blocks are symmetrically installed in pairs at the center of both sides of the non-circular mounting base. Concave limiting blocks that facilitate the lifting and sliding of the sliding blocks are symmetrically installed in pairs on both sides of the interior of the waste heat recovery box near the heat exchange tube.

5. The evaporative bin for drying grain according to claim 4, characterized in that: A rotating shaft is rotatably mounted at the center of one inner end of the irregularly shaped mounting base. Cleaning brushes are evenly spaced around the outer wall of the rotating shaft. A cleaning scraper that is tightly attached to the cleaning brushes is fixedly mounted at the lower inner end of the irregularly shaped mounting base.

6. The evaporative bin for drying grain according to claim 5, characterized in that: A rotary motor is fixedly installed at the center of one side of the irregular mounting base, and a rotary shaft is connected to the output end of the rotary motor. A dust collection drawer is inserted and installed at the bottom inner side of the waste heat recovery box.

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