Drying tower for grain storage

Abstract

The utility model belongs to the field of drying towers for grain storage, and particularly relates to a drying tower for grain storage, which comprises a drying tower, waste gas ports are arranged on the top surface of the drying tower in a rectangular array, and the top surfaces of the waste gas ports are fixedly connected with a high-speed fan and a secondary heating component. The bottom end of the secondary heating assembly is connected with a filtering structure in a penetrating mode, and the bottom end of the filtering structure is connected to a hot air pipe of the drying tower in a penetrating mode. Through the combined design of the conical gas collecting hood and the flow slowing pipe, waste gas in the drying tower is sucked into the conical gas collecting hood through the high-speed fan, and after the waste gas enters the flow slowing pipe through the gas feeding pipe, the airflow retention time is prolonged and heat exchange is enhanced through the fins in an annular array; and meanwhile, the electric heating wire on the support carries out dynamic heat compensation on the waste gas under linkage control of the temperature sensor and the PID controller, airflow obtained after heat compensation is purified through the filtering structure and then guided into the hot air pipe again, a closed-loop hot air circulation system is formed, waste heat of the waste gas is effectively recycled, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of drying towers for grain storage, specifically a drying tower for grain storage. Background Technology

[0002] With the rapid development of the national economy, people have put forward higher requirements for the taste and quality of grains, especially for cooked rice made from finished rice. They require the rice to have a clean appearance, a fragrant aroma, and a moderate texture. If grains are dried in the traditional way of drying in open fields or on the road, the quality of the grains cannot be guaranteed. Grains dried in a timely manner using tower-type continuous multi-stage tempering drying technology have significantly improved quality and taste.

[0003] In the prior art, such as in publication number CN219347074U, a novel grain drying tower for grain drying is disclosed. It includes a drying tower, a collection box fixedly installed at the top of the drying tower, a main feed pipe fixedly installed at the top of the collection box, and distribution pipes fixedly installed on the left and right sides of the bottom of the collection box. Infrared ranging probes are provided on the outer surface of the distribution pipes. A drive motor is fixedly installed at the back of the collection box, and a rotating rod is fixedly connected to the output end of the drive motor.

[0004] While the aforementioned patent achieves the goal of ensuring even grain entry into the two distribution pipes by setting up infrared ranging probes and guide plates, effectively avoiding grain shortages on both sides of the tower, and also eliminates the need for manual adjustment during use, thus reducing labor costs, the exhaust gas generated after the hot air dries the grain still contains a certain amount of heat. Direct emission of this gas results in heat waste. Furthermore, the lack of a structure to filter and clean the exhaust gas means that secondary utilization could also contaminate the grain. Therefore, to address the above issues, a grain drying tower for storage is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, the waste gas generated after hot air drying of grain still contains heat and is directly discharged, resulting in heat waste. At the same time, the lack of a structure to filter and clean the waste gas means that secondary utilization will also cause grain contamination. This utility model proposes a grain drying tower.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a grain storage drying tower according to this utility model includes a drying tower, the top surface of the drying tower is provided with exhaust gas outlets in a rectangular array, a high-speed fan and a secondary heating component are fixedly connected to the top surface of the exhaust gas outlets, a filter structure is connected through the bottom end of the secondary heating component, and the bottom end of the filter structure is connected through the hot air pipe of the drying tower.

[0007] The secondary heating assembly includes a conical gas collection hood covering the top surface of the exhaust port. A gas supply pipe is connected through the top of the conical gas collection hood, and a flow-slowing pipe is connected through the bottom of the gas supply pipe. Several fins are fixedly connected in a ring array inside the flow-slowing pipe. Several supports are fixedly connected from top to bottom inside the flow-slowing pipe. Heating wires are sleeved on the surface of the supports. A temperature sensor is sleeved through a hole on the side of the conical gas collection hood. An equipment box is fixedly connected to the other side of the conical gas collection hood. A PID controller is fixedly connected inside the equipment box.

[0008] The filtration structure includes a filter tube that runs through the bottom of the slow-flow tube, and the interior of the filter tube is fixedly connected from top to bottom with a coarse filter screen, a glass fiber layer and a PPS fiber layer.

[0009] Preferably, the inner wall of the slow-flow tube is fixedly connected to a heating wire by a bracket, the fins are obliquely fixedly connected to the inner wall of the slow-flow tube, and the heating wire is spirally wound around the axial surface of the bracket.

[0010] Preferably, the heating wire is fixedly connected to the surface of the support, and airflow channels with uniform spacing are formed between adjacent fins.

[0011] Preferably, the probe of the temperature sensor extends into the internal cavity of the conical gas collection hood, and the PID controller is electrically connected to the temperature sensor and the heating wire via wires.

[0012] Preferably, the coarse filter screen inside the filter tube is a perforated plate structure, and the glass fiber layer and PPS fiber layer are sequentially stacked and fixedly connected to the inner wall of the filter tube.

[0013] Preferably, the bottom end of the slow-flow pipe is connected to the top end of the filter pipe through a flange, and the bottom end of the filter pipe is connected to the hot air pipe of the drying tower through a corrugated pipe.

[0014] The advantages of this utility model are:

[0015] 1. This utility model utilizes the combined design of the conical gas collection hood and the slow-flow pipe to draw the exhaust gas from the drying tower into the conical gas collection hood using a high-speed fan. After the exhaust gas enters the slow-flow pipe through the gas delivery pipe, the fins of the annular array extend the airflow residence time and enhance heat exchange. At the same time, the heating wires on the support dynamically supplement the exhaust gas under the linkage control of the temperature sensor and the PID controller. The supplemented airflow is purified through the filter structure and then reintroduced into the hot air pipe, forming a closed-loop hot air circulation system, which effectively recovers the waste heat of the exhaust gas and reduces energy consumption.

[0016] 2. This utility model features a three-stage filtration system consisting of a coarse filter, a glass fiber layer, and a PPS fiber layer arranged sequentially inside the filter tube. The coarse filter intercepts large particulate impurities in the exhaust gas, the glass fiber layer adsorbs dust and suspended solids, and the PPS fiber layer further filters harmful substances. Finally, the purified hot air returns to the hot air duct of the drying tower through a corrugated pipe, preventing the exhaust gas from contaminating the grain during secondary use and ensuring the safety of the drying process and the quality of the grain. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the secondary heating component structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the filter structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the disassembled structure of this utility model.

[0022] In the diagram: 1. Drying tower; 2. High-speed fan; 3. Secondary heating component; 31. Conical air collection hood; 32. Air supply pipe; 33. Flow control pipe; 34. Fins; 35. Support frame; 36. Heating wire; 37. Temperature sensor; 38. Equipment box; 39. PID controller; 4. Fiber filtration structure; 41. Filter tube; 42. Coarse filter screen; 43. Glass fiber layer; 44. PPS fiber layer. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1-4As shown, a grain storage drying tower includes a drying tower 1. The top surface of the drying tower 1 has exhaust ports arranged in a rectangular array. A high-speed fan 2 and a secondary heating component 3 are fixedly connected to the top surface of the exhaust ports. A filter structure 4 is connected through the bottom end of the secondary heating component 3. The bottom end of the filter structure 4 is connected through the hot air pipe of the drying tower 1. The secondary heating component 3 includes a conical gas collecting hood 31 covering the top surface of the exhaust ports. An air supply pipe 32 is connected through the top end of the conical gas collecting hood 31. A slow flow pipe 33 is connected through the bottom end of the air supply pipe 32. Several fins 34 are fixedly connected in a ring array inside the slow flow pipe 33. Several supports 35 are fixedly connected from top to bottom inside the slow flow pipe 33. Heating wires 36 are sleeved on the surface of the supports 35. A sleeve hole is opened on the side of the conical gas collecting hood 31 and a temperature sensor 37 is sleeved thereon. An equipment box 38 is fixedly connected to the other side of the conical gas collecting hood 31. A PID controller 39 is fixedly connected inside the equipment box 38.

[0025] During operation, the conical gas collection hood 31 is fixedly connected to the top of the exhaust gas inlet of the drying tower 1 via a flange. The temperature sensor 37, model PT100, is embedded in the side wall of the conical gas collection hood 31 and extends into the internal cavity to monitor the exhaust gas temperature in real time. The slow-flow pipe 33 is connected to the conical gas collection hood 31 via the air supply pipe 32. The inclined fins 34 inside the pipe cause the airflow to form a vortex to prolong the heat exchange time. The heating wire 36 spirally wound on the surface of the support 35 receives the temperature signal through the PID controller 39 in the equipment box 38 and dynamically adjusts the supplementary heating power so that the exhaust gas after secondary heating is filtered through the filter pipe 41 connected by the flange and finally re-enters the hot air pipe of the drying tower 1 through the corrugated pipe, forming a complete waste heat circulation path.

[0026] Furthermore, the filter structure 4 includes a filter tube 41 that is connected to the bottom of the slow-flow tube 33. The filter tube 41 has a coarse filter screen 42, a glass fiber layer 43 and a PPS fiber layer 44 fixedly connected from top to bottom inside.

[0027] During operation, the filter pipe 41 is sealed to the flow-retardant pipe 33 via a flange. Inside, a perforated plate structure coarse filter 42, a stacked glass fiber layer 43, and a high-density PPS fiber layer 44 are installed in sequence. The coarse filter 42 intercepts grain fragments and large particulate impurities in the exhaust gas, the glass fiber layer 43 adsorbs smoke and fine dust, and the PPS fiber layer 44 further filters out harmful substances. The purified gas is introduced into the hot air duct of the drying tower 1 through a corrugated flexible connection structure to ensure the cleanliness of the circulating hot air and avoid secondary contamination of the grain.

[0028] Furthermore, the heating wire 36 is fixedly connected to the surface of the bracket 35, and a uniformly spaced airflow channel is formed between adjacent fins 34.

[0029] During operation, the bracket 35 is fixed to the inner wall of the slow-flow tube 33 by welding or bolting, and the heating wire 36 is tightly wound around the surface of the bracket 35. The equidistant design between adjacent fins 34 forms a regular airflow channel, so that the exhaust gas flows evenly through the heating area of ​​the heating wire 36; ensuring the stability of the heating wire 36 in the airflow, and the evenly spaced fins 34 prevent airflow turbulence or blockage, and maintain stable heat exchange efficiency.

[0030] Furthermore, the probe of the temperature sensor 37 extends into the internal cavity of the conical gas collection hood 31, and the PID controller 39 is electrically connected to the temperature sensor 37 and the heating wire 36 via wires.

[0031] During operation, the probe of the temperature sensor 37 is inserted into the exhaust gas flow path of the conical gas collection hood 31 to collect temperature signals in real time and transmit them to the PID controller 39. After analysis by the algorithm, the controller outputs a control signal to adjust the power output of the heating wire 36 to ensure that the supplementary heating temperature is consistent with the preset value. The controller monitors the exhaust gas temperature in real time and dynamically adjusts the supplementary heating power to achieve precise temperature control and avoid energy waste.

[0032] Working principle: The drying tower 1 collects the hot and humid exhaust gas discharged from the top exhaust port through the conical gas collection hood 31. After the high-speed fan 2 accelerates the exhaust gas into the conical gas collection hood 31, the temperature sensor 37 monitors the exhaust gas temperature in real time and transmits the signal to the PID controller 39 in the equipment box 38. The exhaust gas then enters the slow flow pipe 33 through the air supply pipe 32. Under the guidance of the inclined fins 34 of the internal annular array, a swirling flow is formed, which prolongs the airflow residence time to enhance the heat exchange efficiency. At the same time, the heating wire 36 sleeved on the surface of the support 35 dynamically supplements the heat according to the temperature difference fed back by the temperature sensor 37 under the control of the PID controller 39, so that the exhaust gas temperature is accurately raised to the target value. The supplemented airflow enters the filter pipe 41 through the flange from the bottom of the slow flow pipe 33. It passes through the coarse filter screen 42 to intercept large particulate impurities, the glass fiber layer 43 to adsorb dust and suspended solids, and the PPS fiber layer 44 to filter harmful substances, completing three-stage purification. This improves the heat energy utilization rate while avoiding secondary pollution of the exhaust gas, achieving efficient and energy-saving grain drying operation.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drying tower for grain storage, characterized by: Including drying tower (1), the top surface of drying tower (1) is provided with exhaust port in rectangular array, the top surface of exhaust port is fixedly connected with high-speed fan (2) and secondary heating assembly (3), the bottom end of secondary heating assembly (3) is through connection with filter structure (4), and the bottom end of filter structure (4) is through connection to hot air pipe of drying tower (1); The secondary heating assembly (3) includes the conical gas collecting hood (31) covering the top surface of the exhaust port, the top end of the conical gas collecting hood (31) is through connection with the gas supply pipe (32), the bottom end of the gas supply pipe (32) is through connection with the slow flow pipe (33), the inside of the slow flow pipe (33) is fixedly connected with a plurality of fins (34) in annular array, a plurality of supports (35) are fixedly connected in the inside of the slow flow pipe (33) from top to bottom, the surface of the support (35) is sleeved with the electric heating wire (36), the side of the conical gas collecting hood (31) is provided with sleeve hole and is sleeved with temperature sensor (37), the other side of the conical gas collecting hood (31) is fixedly connected with equipment box (38), and the inside of the equipment box (38) is fixedly connected with PID controller (39); The filter structure (4) includes filter pipe (41) through connection at the bottom end of the slow flow pipe (33), and the inside of the filter pipe (41) is fixedly connected with coarse filter screen (42), glass fiber layer (43) and pps fiber layer (44) from top to bottom.

2. The drying tower for grain storage according to claim 1, characterized in that: The electric heating wire (36) is fixedly connected to the inner wall of the slow flow pipe (33) through the support (35), and the fin (34) is fixedly connected to the inner wall of the slow flow pipe (33) at an angle.

3. The grain drying tower according to claim 1, characterized in that: The electric heating wire (36) is fixedly connected to the surface of the support (35), and uniform spacing airflow channels are formed between adjacent fins (34).

4. The grain drying tower according to claim 1, characterized in that: The probe of the temperature sensor (37) extends to the internal cavity of the conical gas collecting hood (31), and the PID controller (39) is electrically connected with the temperature sensor (37) and the electric heating wire (36) through wires.

5. The grain drying tower according to claim 1, characterized in that: The coarse filter screen (42) in the filter pipe (41) is a punched plate structure, and the glass fiber layer (43) and the pps fiber layer (44) are fixedly connected to the inner wall of the filter pipe (41) in sequence.

6. The grain drying tower according to claim 1, wherein: The bottom end of the slow flow pipe (33) is through connection with the top end of the filter pipe (41) through flange, and the bottom end of the filter pipe (41) is through connection with the hot air pipe of the drying tower (1) through the corrugated pipe.

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