Grain drying system

Abstract

The utility model provides a kind of grain drying system, the grain drying system includes: dryer, is vertically arranged and is used to dry grain;Hot blast furnace, including furnace body, air intake pipe and air supply pipe, the air intake pipe is vertically arranged and the top of the air intake pipe is higher than the top of the dryer, the air intake of the air intake pipe is arranged at top, the air supply port of the air intake pipe is arranged at bottom and together with the furnace body, the furnace body is communicated the dryer by the air supply pipe, and the hot blast furnace is used to supply hot blast to the dryer.The utility model cooperates through dryer and hot blast furnace, can make hot blast furnace entrance smoothly absorb higher temperature air, can reduce fuel consumption in hot blast furnace, reduce fuel cost.

Description

Technical Field

[0001] This utility model belongs to the field of grain drying technology, and in particular relates to a grain drying system. Background Technology

[0002] With the scaling up and modernization of agricultural production, using grain dryers to dry grain has become an important part of the grain production process.

[0003] Hot air generating equipment needs to generate high-temperature hot flue gas by burning fuel or converting electrical energy into heat energy, and then send the hot air to downstream equipment to meet the process requirements of heating, drying, melting and other processes in industrial and agricultural production.

[0004] Grain drying plants typically include drying equipment and supporting hot air equipment. Currently, in drying plants, the air intake of the hot air equipment is usually located near the ground, and the temperature of the air drawn in is relatively low. A lot of heat needs to be absorbed from the hot air equipment to produce high-temperature air, resulting in high fuel consumption and high hot air drying costs. Utility Model Content

[0005] The main purpose of this invention is to propose a grain drying system that aims to solve the technical problem of high fuel consumption in existing hot air drying technology.

[0006] To achieve the above objectives, this utility model provides a grain drying system, comprising: a dryer, vertically arranged and used for drying grain; and a hot air furnace, including a furnace body, an air intake pipe, and an air supply pipe. The air intake pipe is vertically arranged, with its top higher than the top of the dryer. The air intake port of the air intake pipe is located at the top, and the air supply port of the air intake pipe is located at the bottom and connected to the furnace body. The furnace body is connected to the dryer through the air supply pipe, and the hot air furnace is used to supply hot air to the dryer.

[0007] In this embodiment of the invention, the number of dryers is at least two, and the furnace body is connected to at least two dryers through the air supply pipe.

[0008] In this embodiment of the utility model, an installation space is provided between the furnace body and the dryer to accommodate the air supply pipe. The air supply pipe is provided with an air inlet and at least two air outlets. The air inlet is connected to the furnace body, and the number of air outlets is the same as that of the dryer and they are connected in a one-to-one correspondence.

[0009] In this embodiment of the utility model, the air intake pipe includes a horizontal section and a vertical section. The length direction of the horizontal section is consistent with the arrangement direction of the dryer. One end of the horizontal section is connected to the furnace body, and the other end is connected to the bottom of the vertical section.

[0010] In this embodiment of the utility model, the air intake pipe further includes a bent section connecting the horizontal section and the vertical section. The length direction of the bent section is consistent with the width direction of the installation space, so that the vertical section is set close to the furnace body.

[0011] In this embodiment of the invention, the height difference between the air intake and the top surface of the dryer is greater than two meters.

[0012] In this embodiment of the invention, the air intake pipe and the furnace body are sealed together.

[0013] In this embodiment of the invention, the air intake pipe and the furnace body are sealed together by an adhesive layer.

[0014] In this embodiment of the invention, the two ends of the air supply pipe are respectively sealed and connected to the furnace body and the dryer.

[0015] In this embodiment of the utility model, a filter screen is provided inside the air intake pipe, and the filter screen is positioned close to the air intake port.

[0016] Through the above technical solution, the grain drying system provided by this utility model embodiment has the following beneficial effects: When a grain drying system dries grains, the dryer and hot air furnace undergo natural convection heat exchange with the air on their outer surfaces during operation, increasing the air temperature near the equipment. As the air becomes denser from the heat, it accumulates at the top of the grain drying system. Due to solar radiation, the air temperature at the top of the grain drying system reaches 40-50°C, which is 20-30°C higher than the near-ground air temperature. The hot air from the top of the grain drying system is connected to the air inlet of the hot air furnace via an air intake duct. This air intake, located at the top of the grain drying system, absorbs the high-temperature air from the top of the drying plant, increasing the air inlet temperature of the hot air furnace, reducing fuel consumption and costs. It also recovers waste heat from the dryer and hot air furnace during the drying process, as well as heat from the air heated by sunlight at the top of the grain drying system, ensuring full utilization of the heat from the top of the grain drying system. Furthermore, the top of the air intake duct is higher than the top of the dryer, preventing the dryer from obstructing the air intake duct and ensuring sufficient airflow per unit time. The grain drying system of this invention, through the cooperation of the dryer and the hot air furnace, enables the hot air furnace inlet to smoothly absorb high-temperature air, thereby reducing fuel consumption in the hot air furnace and lowering fuel costs.

[0017] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a grain drying system according to an embodiment of the present invention from one perspective; Figure 2 This is a structural schematic diagram of a grain drying system according to an embodiment of the present invention from another perspective.

[0019] Explanation of reference numerals in the attached figures Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] The grain drying system according to this utility model is described below with reference to the accompanying drawings.

[0022] like Figure 1 and Figure 2 As shown, in an embodiment of this utility model, the grain drying system 100 includes a dryer 1 and a hot air furnace 2. The dryer 1 is vertically arranged and used to dry grain. The hot air furnace 2 includes a furnace body 21, an air intake pipe 22, and an air supply pipe 23. The air intake pipe 22 is vertically arranged and its top is higher than the top of the dryer 1. The air intake port of the air intake pipe 22 is located at the top, and the air supply port of the air intake pipe 22 is located at the bottom and connected to the furnace body 21. The furnace body 21 is connected to the dryer 1 through the air supply pipe 23. The hot air furnace 2 is used to supply hot air to the dryer 1.

[0023] It should be noted that the grain drying system 100 in this embodiment is mainly used in a grain drying plant. The grain drying system 100 is housed inside the plant, and the air intake is located near the top of the plant. The grain drying system 100 can dry grains with hot air.

[0024] When the grain drying system 100 in this embodiment is used to dry grains, the outer surfaces of the dryer 1 and the hot air furnace 2 undergo natural convection heat exchange with the air during operation, increasing the air temperature near the equipment. The air density decreases after heating, accumulating at the top of the grain drying system 100. The grain drying system 100 is exposed to solar radiation, and the air temperature at the top of the grain drying system 100 reaches 40-50°C, which is 20-30°C higher than the near-ground air temperature. The hot air from the top of the grain drying system 100 is connected to the air inlet of the hot air furnace 2 via the air intake duct 22. This air intake at the top of the grain drying system 100 absorbs the high-temperature air from the top of the drying plant, increasing the air inlet temperature of the hot air furnace 2, reducing fuel consumption within the hot air furnace 2, lowering fuel costs, and recovering not only the waste heat emitted by the dryer 1 and the hot air furnace 2 during the drying process, but also the heat from the air heated by sunlight at the top of the grain drying system 100, thus fully utilizing the heat from the top of the grain drying system 100. Furthermore, the top of the air intake duct 22 is higher than the top of the dryer 1, which avoids the dryer 1 from blocking the air intake duct 22 and affecting the air intake of the air intake duct 22, thus ensuring the air intake volume of the air intake duct 22 per unit time. In this embodiment, the grain drying system 100, through the cooperation of the dryer 1 and the hot air furnace 2, enables the inlet of the hot air furnace 2 to smoothly absorb high-temperature air, which can reduce fuel consumption in the hot air furnace 2 and reduce fuel costs.

[0025] It should be noted that the dryer 1 is equipped with a dehumidifying fan and an induced draft fan. Since the dryer 1 is connected to the air intake pipe 22 through the air supply pipe 23 and the furnace body 21, the high-temperature air that accumulates at the top of the dryer 1 is drawn into the air intake port of the air intake pipe 22 under the negative pressure formed by the dehumidifying fan and the induced draft fan in the dryer 1, and finally enters the furnace body 21 through the air intake pipe 22.

[0026] Fuel is burned in the furnace chamber of furnace body 21, producing high-temperature flue gas. This high-temperature flue gas then enters the heat exchanger of furnace body 21, where it exchanges heat with air entering from the air intake duct 22. In the heat exchanger, the high-temperature flue gas continuously transfers heat to the low-temperature air that needs heating, causing the flue gas temperature to continuously decrease; while the air absorbs heat, its temperature continuously increases. Finally, a hot air product of 60~120℃ is obtained, which enters dryer 1 for subsequent drying operations.

[0027] In this process, the formula for calculating the heat absorbed by the low-temperature air from the hot blast stove 2 is:

[0028] In the formula: The heat absorbed by the air inside the hot blast stove 2 during the heat exchange process is expressed in kJ / h. The average isobaric specific heat capacity (physical property of air) of the hot air produced by hot blast stove 2 is given in kJ / (kg·℃). The average constant-pressure specific heat capacity (physical property of air) of the cold air drawn into the air intake of hot blast stove 2 is given in kJ / (kg·℃). The temperature of the hot air produced by hot air furnace 2 (which can be adjusted by adjusting the output temperature of hot air furnace 2), ℃; The temperature of the cold air drawn in through the air inlet of hot air furnace 2 (the ambient temperature near the inlet), ℃; The mass of air heated by hot air furnace 2, in kg / m3; When the temperature of the hot air supplied by the hot air furnace 2 to the air supply pipe 23 is constant, the grain drying system 100 increases the temperature of the cold air drawn in by the air inlet of the hot air furnace 2 by means of heat recovery, which can reduce the heat Q absorbed by the air from the hot air furnace 2, thereby reducing the fuel consumption of the hot air furnace 2 and saving costs.

[0029] In a grain drying plant, the outer surfaces of the grain dryer 1 and hot air furnace 2 undergo natural convection heat exchange with the air in the plant during operation, leading to an increase in the air temperature near the equipment. The air density decreases after heating at the bottom of the dryer 1 and hot air furnace 2, causing it to accumulate at the top of the drying plant. Furthermore, the top of the grain drying system 100 is exposed to solar radiation, resulting in an air temperature of 40-50°C, significantly higher than the near-ground air temperature of 20-30°C. With a ground temperature of 20°C, the air temperature at the inlet of hot air furnace 2 is raised to 30°C after implementing a heat recovery scheme. The temperature of the hot air output from the outlet of hot air furnace 2 is set at 90°C. Under these conditions, the heat absorption Q1' of the hot air using the heat recovery scheme is 83.3% of the heat absorption Q1 of the conventional scheme, theoretically saving 16.7% of the fuel consumption of hot air furnace 2, demonstrating significant potential.

[0030] In one embodiment, the number of dryers 1 is at least two, and the furnace body 21 is connected to at least two dryers 1 through an air supply pipe 23. In this embodiment, the air supply pipe 23 may include a main section 231 and at least two branch sections 232. The number of branch sections 232 is the same as the number of dryers 1 and they are connected one-to-one. At least two branch sections 232 are connected in parallel to the main section 231. The length direction of the main section 231 is consistent with the arrangement direction of the dryers 1. At least two dryers 1 are arranged sequentially at intervals along the length direction of the furnace body 21. One hot air furnace 2 can supply hot air to multiple dryers 1 at the same time, which can save the number of hot air furnaces 2 and reduce equipment costs.

[0031] It should be noted that an installation space 3 is provided between the furnace body 21 and the dryer 1 to accommodate the air supply pipe 23. The air supply pipe 23 is provided with an air inlet and at least two air outlets. The air inlet is connected to the furnace body 21, and the number of air outlets is the same as that of the dryer 1, and they are connected one-to-one. Figure 1 and Figure 2 As shown, the dryer 1 is spaced apart in the left-right direction, and the furnace body 21 and the dryer 1 are spaced apart in the front-back direction. The installation space 3 between the furnace body 21 and the dryer 1 can accommodate the air supply pipe 23, thereby improving the structural compactness of the grain drying system 100.

[0032] Specifically, the air intake duct 22 includes a horizontal section 221 and a vertical section 222. The length direction of the horizontal section 221 is consistent with the arrangement direction of the dryers 1. One end of the horizontal section 221 is connected to the furnace body 21, and the other end is connected to the bottom of the vertical section 222. In one embodiment, there are three dryers 1, and the furnace body 21 is set close to the dryer 1 located in the middle. In other embodiments, the number of dryers 1 can be set according to actual usage requirements. The furnace body 21 can be located in the middle of the multiple dryers 1 along the arrangement direction of the multiple dryers 1. By cooperating with the horizontally set horizontal section 221 and the vertically set vertical section 222, the horizontal section 221 extends along the length direction of the furnace body 21, which allows the vertical section 222 to avoid the installation space 3 and prevents the air intake duct 22 and the air supply duct 23 from interfering with each other.

[0033] Furthermore, the air intake duct 22 also includes a bent section 223 connecting the horizontal section 221 and the vertical section 222. The length direction of the bent section 223 is consistent with the width direction of the installation space 3, so that the vertical section 222 is set close to the furnace body 21. In this embodiment, the bent section 223 extends from the furnace body 21 towards the dryer 1, which allows the air intake of the air intake duct 22 to be close to the top of the dryer 1, so that the air inlet of the hot air furnace 2 can recover as much heat as possible from the dryer 1.

[0034] It should be noted that the height difference between the air intake and the top surface of the dryer 1 is greater than two meters. In one embodiment, the height of the air intake inlet of the air intake duct 22 is 2 meters higher than the top platform of the dryer 1, which can ensure the safety of the operators and at the same time prevent the air intake duct 22 from being disturbed when the operators are operating on the top of the dryer 1.

[0035] In one embodiment, the air intake duct 22 and the furnace body 21 are sealed together. An inlet hood is provided at one end of the air intake duct 22 near the furnace body 21. The inlet hood has a conical cross-section, which facilitates the connection between the air intake duct 22 and the furnace body 21. The sealed connection between the inlet hood and the furnace body 21 ensures that cold air with a lower temperature near the ground will not be drawn in through the gap at the connection between the inlet hood and the furnace body 21, thus preventing cold air from entering the hot air furnace 2 and affecting the recovery of heat.

[0036] Specifically, the air intake duct 22 and the furnace body 21 are sealed together by an adhesive layer. In this embodiment, the sealing connection by the adhesive layer ensures the airtightness between the air intake duct 22 and the furnace body 21, while also facilitating the assembly of the air intake duct 22 and the furnace body 21.

[0037] In this embodiment of the invention, both ends of the air supply pipe 23 are sealed to the furnace body 21 and the dryer 1, respectively. The sealed connection between the air supply pipe 23 and the furnace body 21, and between the air supply pipe 23 and the dryer 1, ensures that during the process of the furnace body 21 supplying hot air to the dryer 1 through the air supply pipe 23, cold air cannot enter the air supply pipe 23 through the connection, further ensuring the stability of the hot air delivery in the grain drying system 100.

[0038] In this embodiment of the invention, a filter screen 224 is installed inside the air intake pipe 22, and the filter screen 224 is positioned close to the air intake. Installing the filter screen 224 in front of the air intake of the air intake pipe 22 can prevent small impurities from entering the pipe, avoiding damage to the dryer 1 and the hot air furnace 2 due to impurities or the need for maintenance, and ensuring the service life of the grain drying system 100.

[0039] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A grain drying system, characterized in that, The grain drying system (100) includes: The dryer (1) is set vertically and is used to dry grains; The hot air furnace (2) includes a furnace body (21), an air intake pipe (22) and an air supply pipe (23). The air intake pipe (22) is arranged vertically and the top of the air intake pipe (22) is higher than the top of the dryer (1). The air intake port of the air intake pipe (22) is located at the top, and the air supply port of the air intake pipe (22) is located at the bottom and connected to the furnace body (21). The furnace body (21) is connected to the dryer (1) through the air supply pipe (23). The hot air furnace (2) is used to supply hot air to the dryer (1).

2. The grain drying system according to claim 1, characterized in that, The number of dryers (1) is at least two, and the furnace body (21) is connected to at least two dryers (1) through the air supply pipe (23).

3. The grain drying system according to claim 2, characterized in that, An installation space (3) for accommodating the air supply pipe (23) is provided between the furnace body (21) and the dryer (1). The air supply pipe (23) is provided with an air inlet and at least two air outlets. The air inlet is connected to the furnace body (21), and the number of air outlets is the same as that of the dryer (1) and they are connected one-to-one.

4. The grain drying system according to claim 3, characterized in that, The air intake pipe (22) includes a horizontal section (221) and a vertical section (222). The length direction of the horizontal section (221) is consistent with the arrangement direction of the dryer (1). One end of the horizontal section (221) is connected to the furnace body (21), and the other end is connected to the bottom of the vertical section (222).

5. The grain drying system according to claim 4, characterized in that, The air intake pipe (22) also includes a bent section (223) connecting the horizontal section (221) and the vertical section (222). The length direction of the bent section (223) is consistent with the width direction of the installation space (3), so that the vertical section (222) is set close to the furnace body (21).

6. The grain drying system according to any one of claims 1 to 4, characterized in that, The height difference between the air intake and the top surface of the dryer (1) is greater than two meters.

7. The grain drying system according to any one of claims 1 to 4, characterized in that, The air intake pipe (22) and the furnace body (21) are sealed together.

8. The grain drying system according to claim 7, characterized in that, The air intake pipe (22) and the furnace body (21) are sealed together by an adhesive layer.

9. The grain drying system according to any one of claims 1 to 4, characterized in that, The two ends of the air supply pipe (23) are respectively sealed and connected to the furnace body (21) and the dryer (1).

10. The grain drying system according to any one of claims 1 to 4, characterized in that, A filter (224) is provided inside the air intake pipe (22), and the filter (224) is located close to the air intake.

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