Split type heat recovery type heat pump grain drying equipment

Abstract

This utility model relates to a split-type waste heat recovery heat pump grain drying equipment, including a condenser, a grain dryer, an evaporator, and a pulse dust collector. The condenser is connected to the evaporator via a delivery pipeline and is installed at the air inlet of the grain dryer. The pulse dust collector is installed on one side of the grain dryer, and the air outlet of the grain dryer is connected to the air inlet of the pulse dust collector. The evaporator is installed at the air outlet of the pulse dust collector. Fresh air with low moisture content enters through the condenser air inlet and will not affect the grain drying effect. A delivery pipeline transports refrigerant between the evaporator and condenser, replacing the bulkier ductwork used in integrated heat pumps to transport waste heat exhaust gas or hot air for drying. This saves space and reduces heat loss, offering significant economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of grain drying technology, and in particular to a split-type waste heat recovery type heat pump grain drying equipment. Background Technology

[0002] Heat pump technology is a mature engineering technology with widespread applications in many fields. However, its application in grain drying is an innovation. While low-temperature grain drying technology was largely adopted abroad by the late 1980s, fuel oil has remained the primary heat source for drying. In the 1990s, several foreign dryer manufacturers and research institutions researched and experimented with heat pump grain drying technology, but ultimately abandoned the project due to problems such as the dusty environment, complex dust removal facilities, and humid air intake.

[0003] Over the years, relevant research institutions and grain dryer manufacturers in my country have made unremitting efforts and achieved significant breakthroughs in heat pump grain drying engineering technology. This has not only solved the problem of heat sources in some areas lacking natural gas and steam, but also improved fire safety in grain drying operations. However, in winter, the energy efficiency ratio of heat pumps is still greatly reduced due to frost and other factors, making it impossible to provide sufficient heat for drying, which limits the application range of heat pump dryers. Utility Model Content

[0004] The purpose of this invention is to provide a split-type waste heat recovery heat pump grain drying equipment to solve the problems encountered in the background art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A split-type waste heat recovery heat pump grain drying equipment includes a condenser, a grain dryer, an evaporator, and a pulse dust collector. The condenser is connected to the evaporator through a conveying pipeline. The condenser is installed at the air inlet of the grain dryer. The pulse dust collector is installed on one side of the grain dryer. The air outlet of the grain dryer is connected to the air inlet of the pulse dust collector. The evaporator is installed at the air outlet of the pulse dust collector.

[0007] In implementation, the delivery pipeline is a copper pipe for delivering the refrigerant. Furthermore, the delivery pipeline passes through the lower part of the drying chamber of the grain dryer, with one end connected to the condenser and the other end connected to the evaporator, thus configuring the heat pump as a split-type structure. Additionally, the diameter of the delivery pipeline is smaller than that of an integrated heat pump, specifically 20-25 mm, and the pipeline is externally wrapped with an insulation layer to prevent heat loss.

[0008] In the above scheme, a fan is installed at the air outlet of the pulse dust collector, and the fan is connected to the air inlet of the evaporator through a pipe. As a preferred embodiment, the direction of the air outlet at the top of the evaporator is opposite to the direction of the air inlet of the condenser, to prevent humid air that is below the ambient temperature from being directly supplied to the condenser as fresh air.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. Fresh air enters through the condenser inlet, with low moisture content, which will not affect the drying effect on grains. The clean exhaust gas, containing residual heat and high moisture content, after being processed by the pulse dust collector, provides ample heat to the evaporator. When the outside air temperature is low, the evaporator is less prone to frosting, maintaining a high energy efficiency ratio. The heat pump in this system adopts a split structure, with refrigerant transported between the evaporator and condenser via pipelines. This replaces the bulkier ducts used in integrated heat pumps to transport exhaust gas with residual heat or hot air for drying, saving space and effectively reducing heat loss during hot air transport, thus offering significant economic benefits.

[0011] 2. The evaporator inlet can draw in mixed air at temperatures higher than room temperature, effectively improving the application range and efficiency of the heat pump. Simultaneously, the evaporator and condenser are connected via pipelines, achieving the requirement of separate heat pump units. This avoids the intake of gases with residual heat and high moisture content from an integrated heat pump for use in grain drying, which would negatively impact the drying effect. This split-type waste heat recovery heat pump grain drying equipment forms an independent system. Through waste heat recovery, the heat pump can operate normally even in low-temperature environments. The pulse dust collector effectively treats dust, solving the problem of dust adhering to the heat pump system and affecting heat exchange. The split-type structure of the heat pump in this system solves the problem of large air ducts occupying a lot of space and avoids heat loss of the hot air entering the grain dryer, indirectly improving the grain drying efficiency. Attached Figure Description

[0012] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0013] Figure 1 This is a front view structural diagram of the present utility model;

[0014] Figure 2 This is a top view of the structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the installation of the pulse dust collector and the evaporator in another embodiment of the present invention.

[0016] Numbers in the diagram: 1-Condenser; 2-Grain dryer; 3-Conveying pipeline; 4-Evaporator; 5-Pipeline; 6-Fan; 7-Pulse dust collector; 8-Steel house; 9-Support frame. Detailed Implementation

[0017] To make the technical means, creative features, achieved objectives and effects of this utility model easier to understand, the utility model will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of this utility model, and therefore only show the relevant components of this utility model.

[0018] Based on the technical solution of this utility model, without changing the essential spirit of this utility model, those skilled in the art can propose various interchangeable structural methods and implementation methods. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model, and should not be regarded as the entirety of this utility model or as a limitation or restriction of the technical solution of this utility model.

[0019] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] Example 1, such as Figure 1 and Figure 2 As shown, a split-type waste heat recovery heat pump grain drying equipment includes a condenser 1, a grain dryer 2, an evaporator 4, and a pulse dust collector 7. The grain dryer 2 is used to dry grains such as rice, wheat, millet, and soybeans. The condenser 1 and evaporator 4 are important components of the heat pump system. The condenser 1 is connected to the evaporator 4 through a delivery pipeline 3. The condenser 1 is installed at the air inlet of the grain dryer 2, and converts gas into liquid through heat exchange, releasing heat to heat the fresh air input into the grain dryer 2 for drying.

[0021] In implementation, the refrigerant delivery pipeline 3 is a copper pipe used to connect the evaporator and condenser, achieving separation of the heat pump body, thereby improving the heat transfer performance of the condenser 1, increasing condensation efficiency, and reducing condensation temperature. Carbon dioxide can be used as a refrigerant and delivered through the delivery pipeline 3. Furthermore, the delivery pipeline 3 passes through the lower part of the drying chamber of the grain dryer 2, facilitating the delivery of refrigerant via a convenient route, meeting both process and actual installation requirements.

[0022] One end of the delivery pipe 3 is sealed to the condenser 1 via a sealing sleeve, and the other end is sealed to the evaporator 4 via a sealing sleeve. This design establishes a split structure for the heat pump, preventing the intake of gases with residual heat and high moisture content from the integrated heat pump, which would otherwise affect the grain drying effect. The diameter of the delivery pipe 3 is smaller than that of the integrated heat pump, ranging from 20 to 30 millimeters. Two pipe diameters are available for the delivery pipe 3: eight pipes (22 or 23 millimeters each) transport liquid refrigerant from the condenser 1 to the evaporator 4, and eight pipes (28 millimeters each) transport gaseous refrigerant from the evaporator 4 to the condenser 1. Furthermore, the delivery pipe 3 is externally wrapped with an insulation layer to prevent heat loss and better utilize residual heat.

[0023] The split design of the delivery pipeline 3, and the use of a smaller pipe diameter than that in conventional heat pumps, occupies less space compared to existing integrated heat pumps, and avoids the re-entry of exhaust gas with high moisture content into the grain dryer 2, thus saving space and reducing heat loss. Figure 1 and Figure 2 The reason why the diameter of the conveying pipe 3 shown is relatively large is to allow those skilled in the art to see the wiring path of the conveying pipe 3 more intuitively, so as to facilitate on-site fabrication.

[0024] A pulse dust collector 7 is installed on one side of the grain dryer 2. The outlet of the grain dryer 2 is connected to the inlet of the pulse dust collector 7, and the evaporator 4 is installed at the outlet of the pulse dust collector 7. The exhaust gas discharged from the grain dryer 2, which contains dust, has a high moisture content, and has residual heat, is filtered by the pulse dust collector 7 to remove dust and impurities, and then enters the evaporator 4 to absorb heat and form waste heat recovery.

[0025] The gas discharged from the grain dryer 2 at a temperature higher than normal is purified by the pulse dust collector 7 and sent to the inlet of the evaporator 4 through the air outlet of the pipe 5, thereby increasing the air inlet temperature of the evaporator 4 and thus providing a higher hot air temperature with the same power consumption.

[0026] In implementation, the air outlet of the pulse dust collector 7 is located at the bottom of the pulse dust collector 7, and a fan 6 is installed at the air outlet. The fan 6 is connected to the air inlet of the evaporator 4 through a pipe 5. Pipe 5 is the waste heat recovery pipe, and bends can be used for transitions depending on the delivery location. As a preferred embodiment, the direction of the top air outlet of the evaporator 4 is opposite to the direction of the air inlet of the condenser 1. This ensures that the air discharged from the evaporator 4 does not enter the condenser 1, and that the air entering the condenser 1 is fresh air.

[0027] When the pipe 5 is a right-angle bend, the air inlet of the pipe 5 is located at the bottom air outlet of the pulse dust collector 7 and is connected through the fan 6; the top air outlet of the pipe 5 is connected to the air inlet of the evaporator 4 through a flared mouth.

[0028] Example 2, please refer to Figure 3 Unlike the structure in Example 1, where the fan 6 is directly connected to the air inlet of the evaporator 4 via pipe 5, potentially leading to uneven internal gas distribution, this design uses a welded support frame 9 between the grain dryer 2 and the pulse dust collector 7. A steel plate house 8, welded from sheet metal, is mounted on top of the support frame 9, and the evaporator 4 is installed inside the steel plate house 8. The fan 6 is installed at the air outlet of the pulse dust collector 7 and connected to its air inlet. The steel plate house 8 is connected to the air outlet of the fan 6 via pipe 5. This connection ensures a more uniform gas mixture during heat exchange, facilitating the full utilization of waste heat. This pipe 5 serves as a waste heat recovery pipe.

[0029] By installing fan 6, a good working environment is ensured through negative pressure operation. By installing evaporator 4 inside steel plate house 8, it is ensured that the hot air delivered by pipe 5 can be fully mixed with the fresh air entering steel plate house 8, and the air supply to evaporator 4 is maximized to utilize waste heat.

[0030] Furthermore, the duct 5 has a straight cylindrical structure, with its air inlet located at the bottom outlet of the pulse dust collector 7 and connected via the fan 6. Additionally, the top outlet of the duct 5 passes through the support frame 9 and connects to the air inlet of the steel prefabricated house 8.

[0031] During implementation, pipe 5, fan 6, pulse dust collector 7, and steel prefabricated house 8 are all installed on one side of grain dryer 2. The air outlet of grain dryer 2 is connected to the air inlet of pulse dust collector 7, the air outlet of pulse dust collector 7 is connected to the air inlet of fan 6, the air outlet of fan 6 is connected to the air inlet of pipe 5, and the air outlet of pipe 5 is connected to steel prefabricated house 8. Steel prefabricated house 8 is installed on support frame 9. The size and related auxiliary facilities of steel prefabricated house 8 must be compatible with the number and power of the heat pump. Evaporator 4 is installed inside steel prefabricated house 8, and its position and installation direction must correspond to the position of air outlet of pipe 5 and the position of air supply outlet of steel prefabricated house 8. This ensures that the mixed gas with waste heat can be fully mixed with the supplemented room temperature air, effectively improving the utilization rate of waste heat.

[0032] The mixed gas containing dust, high moisture content, and residual heat discharged from the grain dryer 2 is filtered by the pulse dust collector 7 to remove dust and impurities, and then sent to the air inlet of the evaporator 4 through the air duct of the pipe 5 to increase the air inlet temperature of the evaporator 4 and achieve the purpose of waste heat recovery.

[0033] In the two embodiments described above, the exhaust gas discharged from the grain dryer 2, which contains dust, has a high moisture content, and a temperature higher than the outdoor temperature, is filtered by the pulse dust collector 7 to remove dust and impurities. The clean exhaust gas with a high moisture content and a temperature higher than the outdoor temperature is then mixed with the air introduced into the steel plate house 8, increasing the temperature of the air entering the evaporator 4. This allows the heat pump to operate normally at a lower temperature without frost formation under the same conditions, thus providing sufficient heat for drying the grain.

[0034] This split-type waste heat recovery heat pump grain drying equipment forms an independent system. Through waste heat recovery, the heat pump can be used normally in low-temperature environments. The pulse dust collector 7 treats the dust, solving the problem of dust adhering to the heat pump system and affecting heat exchange. The heat pump adopts a split structure in this system, which not only solves the problem of large air ducts occupying a lot of space, but also avoids the problem of high moisture content exhaust gas re-entering the grain dryer 2, affecting the heat loss of the hot air for drying grain, and indirectly improving the efficiency of grain drying.

[0035] With the above layout, the air entering through the condenser 1 inlet is fresh air with low moisture content, which will not affect the drying effect of the grain. The clean exhaust gas with residual heat and high moisture content, processed by the pulse dust collector 7, provides more heat to the evaporator 4. When the outside air temperature is low, the evaporator 4 is less prone to frosting and can maintain a high energy efficiency ratio. The refrigerant is transported between the evaporator 4 and the condenser 1 by the delivery pipeline 3, which replaces the bulkier duct used by the integrated heat pump to transport exhaust gas with residual heat or hot air used for drying. This saves space and reduces heat loss, and has good economic value.

[0036] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. These undisclosed elements are all prior art known to those skilled in the art.

[0037] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A split type heat recovery heat pump grain drying apparatus, characterized by: The system includes a condenser (1), a grain dryer (2), an evaporator (4), and a pulse dust collector (7). The condenser (1) is connected to the evaporator (4) via a conveying pipeline (3). The condenser (1) is installed at the air inlet of the grain dryer (2). The pulse dust collector (7) is installed on one side of the grain dryer (2). The air outlet of the grain dryer (2) is connected to the air inlet of the pulse dust collector (7). The evaporator (4) is installed at the air outlet of the pulse dust collector (7).

2. The split type heat recovery heat pump grain drying apparatus according to claim 1, characterized in that: The delivery pipeline (3) is a copper pipe for delivering the refrigerant.

3. The split type heat recovery heat pump grain drying apparatus according to claim 2, characterized in that: The conveying pipe (3) passes through the lower part of the drying chamber of the grain dryer (2). One end of the conveying pipe (3) is connected to the condenser (1), and the other end of the conveying pipe (3) is connected to the evaporator (4).

4. The split type heat recovery heat pump grain drying apparatus according to claim 1, characterized in that: A fan (6) is installed at the air outlet of the pulse dust collector (7), and the fan (6) is connected to the air inlet of the evaporator (4) through a pipe (5).

5. A split heat recovery heat pump grain drying apparatus according to claim 4 wherein: The direction of the top air outlet of the evaporator (4) is opposite to the direction of the air inlet of the condenser (1).

6. The split type heat recovery heat pump grain drying apparatus according to claim 4, characterized in that: The pipe (5) is a right-angled bend structure. The air inlet of the pipe (5) is located at the bottom air outlet of the pulse dust collector (7) and is connected through the fan (6). The top air outlet of the pipe (5) is connected to the air inlet of the evaporator (4) through a flared mouth.

7. The split type heat recovery heat pump grain drying apparatus according to claim 1, characterized in that: A support frame (9) is installed between the grain dryer (2) and the pulse dust collector (7). A steel plate house (8) is installed on the top of the support frame (9). The evaporator (4) is installed inside the steel plate house (8). A fan (6) is installed at the air outlet of the pulse dust collector (7). The steel plate house (8) is connected to the air outlet of the fan (6) through a pipe (5).

8. The split type heat recovery heat pump grain drying apparatus according to claim 7, characterized in that: The pipe (5) is a straight cylindrical structure. The air inlet of the pipe (5) is located at the bottom air outlet of the pulse dust collector (7) and is connected through the fan (6). The top air outlet of the pipe (5) passes through the support frame (9) and is connected to the air inlet of the steel plate house (8).

9. The split type heat recovery heat pump grain drying apparatus according to claim 1, characterized in that: The diameter of the delivery pipeline (3) is smaller than that of the integrated heat pump. The diameter of the delivery pipeline (3) is 20-30 mm. The delivery pipeline (3) is wrapped with an insulation layer.

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