Intelligent drying system of air source heat pump

Abstract

The utility model discloses an air source heat pump intelligent drying system which is characterized by comprising a drying tower which at least comprises a drying section and a cooling section. The heat pump is used for providing hot air for the drying section of the drying tower; the cooling induced draft fan is used for driving cold air to penetrate through the cooling section of the drying tower to cool the grains in the cooling section; the cooling heat exchanger is used for transferring heat in air sent out by the drying tower cooling section to dry air and sending the dry air to the heat pump; heat absorbed by cooled grains is transferred into dry air through the cooling heat exchanger, and the preheated dry air serves as supplementary air to be sent into the heat pump, so that energy consumption is reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of grain drying, and more specifically, to an air source heat pump intelligent drying system. Background Art

[0002] After grain is harvested, in order to extend the storage period of grain, it is necessary to reduce the moisture content of grain, that is, it is necessary to dry the grain. Among the existing grain drying equipment, most of them use drum dryers or tower dryers, which use coal as the heat source, and heat the air through a heat exchanger and then directly pass it into the dryer for drying.

[0003] When the existing drying equipment is drying, most of the heated and dried grains are cooled naturally, so that this part of the heat is directly lost and cannot be effectively utilized. This also makes the existing drying equipment have high energy consumption and high drying costs. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an air source heat pump intelligent drying system, which transfers the heat absorbed by the cooled grain to the drying air through a cooling heat exchanger, and sends the preheated dry air to the heat pump as supplementary air, thereby reducing energy consumption and lowering costs.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an air source heat pump intelligent drying system, comprising a drying tower, wherein the drying tower comprises at least a drying section and a cooling section;

[0006] A heat pump, the heat pump is used to provide hot air for the drying section of the drying tower;

[0007] The cooling induced draft fan is used to drive cold air through the cooling section of the drying tower to cool the grain in the cooling section;

[0008] and a cooling heat exchanger, the cooling heat exchanger being used to transfer heat in the air sent out from the cooling section of the drying tower to the dry air and send the dry air to the heat pump;

[0009] The drying tower also includes a slow recovery section, which is used to delay the time for the grain sent out from the drying section to enter the cooling section;

[0010] A plurality of cooling pipes are arranged in the cooling section. The cooling pipes are divided into air inlet cooling pipes and air outlet cooling pipes. The air inlet cooling pipes are used to send external cold air into the cooling section, and the air outlet cooling pipes send the air after cooling the grain out of the cooling section.

[0011] The utility model is further configured as follows: a plurality of ventilation pipes are arranged in the drying section, the ventilation pipes are divided into air inlet ventilation pipes and air outlet ventilation pipes, and the air inlet ventilation pipes and the air outlet ventilation pipes are arranged alternately in the drying section;

[0012] The air inlet ventilation duct is used to deliver the air heated by the heat pump to the drying section, and the air outlet ventilation duct is used to deliver the air after the grain is heated and dried in the drying section.

[0013] The utility model is further configured as follows: the ventilation pipe is configured as a triangular pipe, the ventilation pipe is configured in the drying section with one angle facing upward, one side edge being located at the bottom and horizontal, and the opening of the ventilation pipe being located at the bottom of the ventilation pipe.

[0014] The utility model is further configured as follows: the ventilation pipes are configured as multiple groups, each group includes multiple ventilation pipes, the multiple groups of ventilation pipes are horizontally arranged and parallel to each other, the multiple ventilation pipes in the same group are arranged along a horizontal direction perpendicular to their own length direction, the multiple groups of ventilation pipes are arranged vertically, and two adjacent groups of ventilation pipes are staggered along the horizontal arrangement direction of the ventilation pipes.

[0015] The utility model is further configured as follows: a plurality of slow-release tubes are arranged in the slow-release section, the top opening area of ​​the slow-release tubes is larger than the bottom opening area, the cross-section of the slow-release tubes perpendicular to their own length direction is funnel-shaped, and the plurality of slow-release tubes are arranged along a horizontal direction perpendicular to their own length direction, and two adjacent slow-release tubes are in contact with each other.

[0016] The utility model is further configured as follows: the cooling pipes are provided with several groups, each group includes multiple cooling pipes, the multiple groups of cooling pipes are arranged horizontally and parallel to each other, the multiple cooling pipes in the same group are arranged along a horizontal direction perpendicular to their own length direction, the multiple groups of cooling pipes are arranged vertically, and two adjacent groups of cooling pipes are arranged alternately along the horizontal arrangement direction of the cooling pipes.

[0017] The utility model is further configured as follows: the heat pump includes a heat pump evaporator, and the air after grain processing in the drying section passes through the heat pump evaporator, and the heat pump evaporator absorbs the residual heat in the air and condenses the moisture in the air and sends it out;

[0018] Heat pump condenser, which is used to receive the air cooled and dried by the heat pump evaporator and heat the air before sending it to the drying section;

[0019] And a heat pump compressor, which is used to drive the condensing medium to circulate between the heat pump evaporator and the heat pump condenser.

[0020] The utility model is further configured to include a dust collector, which is used to filter and remove dust from the air sent out from the drying section to prevent dust impurities in the air from clogging the heat pump evaporator.

[0021] In summary, compared with the prior art, the utility model has the following beneficial effects: the utility model transfers the heat absorbed by the cooled grain to the dry air through the cooling heat exchanger, and sends the preheated dry air to the heat pump as supplementary air, thereby reducing energy consumption and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of an embodiment;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0024] Figure 3 for Figure 1 An enlarged schematic diagram of part B.

[0025] In the figure: 1. drying tower; 11. grain storage section; 111. rotating shaft; 112. material balancing plate; 113. upper limit sensor; 114. lower limit sensor; 12. drying section; 121. ventilation pipe; 13. slow recovery section; 131. slow recovery pipe; 132. slow recovery section temperature sensor; 133. slow recovery section humidity sensor; 14. cooling section; 141. cooling pipe; 15. grain discharge section; 151. grain discharge humidity sensor; 16. unloader; 17. grain inlet pipe; 2. bucket elevator; 3. cooling heat exchanger; 4. heat absorption pipeline; 5. circulation pipe; 51. heat pump evaporator; 52. heat pump condenser; 53. heat pump compressor; 54. heat pump throttle valve; 55. dust collector; 56. exhaust gas temperature sensor; 57. exhaust gas humidity sensor; 58. hot air temperature sensor; 59. temperature sensor after dehydration. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making creative work should all fall within the scope of protection of this application. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the creation of the present invention.

[0027] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0028] Example 1: An air source heat pump intelligent drying system, see attached Figure 1 -Attached Figure 3, including a drying tower 1, a heat pump, a cooling induced draft fan and a cooling heat exchanger 3, wherein the drying tower 1 at least includes a drying section 12 and a cooling section 14; the heat pump is used to provide hot air for the drying section 12 of the drying tower 1; the cooling induced draft fan is used to drive cold air to pass through the cooling section 14 of the drying tower 1 to cool the grain in the cooling section 14; the cooling heat exchanger 3 is used to transfer the heat in the air sent out from the cooling section 14 of the drying tower 1 to the dry air and send the dry air to the heat pump.

[0029] When the cold air enters the cooling section 14 of the drying tower 1 to dry the grain, it will absorb the heat in the grain, and can take away some of the moisture in the grain in the process of cooling the grain, assisting the drying section 12 to dry the grain; the air sent out from the cooling section 14 contains the heat absorbed from the grain, but because this part of the air also absorbs some of the moisture in the grain, this part of the air is humid air and is not suitable for being directly sent to the heat pump, so a cooling heat exchanger 3 is set to absorb the heat in the air sent out by the cooling section 14 through dry air, and then the heated dry air is sent to the heat pump.

[0030] The air delivered by the cooling section 14 passes through the cooling heat exchanger 3 through the pipeline under the action of the fan, and the dry air also passes through the cooling heat exchanger 3 through the pipeline. In the cooling heat exchanger 3, the heat in the air delivered by the cooling section 14 is transferred to the dry air. The pipeline through which the dry air passes is the heat absorption pipeline 4.

[0031] Specifically, a plurality of ventilation ducts 121 are provided in the drying section 12, and the ventilation ducts 121 are divided into air inlet ventilation ducts 121 and air outlet ventilation ducts 121, and the air inlet ventilation ducts 121 and the air outlet ventilation ducts 121 are alternately arranged in the drying section 12; the air inlet ventilation ducts 121 are used to deliver the air heated by the heat pump into the drying section 12, and the air outlet ventilation ducts 121 are used to deliver the air after heating and drying the grain in the drying section 12. The ventilation pipe 121 is set as a triangular pipe. The ventilation pipe 121 is set in the drying section 12 with one angle facing upward, one side of which is located at the bottom and horizontal, and the opening of the ventilation pipe 121 is located at the bottom of the ventilation pipe 121; the ventilation pipe 121 is set in multiple groups, each group includes multiple ventilation pipes 121, multiple groups of ventilation pipes 121 are arranged horizontally and parallel to each other, multiple ventilation pipes 121 in the same group are arranged in a horizontal direction perpendicular to their own length direction, multiple groups of ventilation pipes 121 are arranged vertically, and two adjacent groups of ventilation pipes 121 are arranged in a staggered manner along the horizontal arrangement direction of the ventilation pipes 121. Multiple ventilation pipes 121 in the same group are staggered along the arrangement direction to arrange the air inlet ventilation pipes 121 and the air outlet ventilation pipes 121.

[0032] The ventilation pipe 121 is configured as a triangular pipe and the opening is configured on the bottom plane of the ventilation pipe 121, so that the area of ​​the opening is increased, thereby reducing the wind pressure and achieving the effect of saving the fan energy efficiency.

[0033] Specifically, in the drying tower 1, the drying section 12 and the cooling section 14 are arranged vertically from top to bottom. The grain enters the drying tower 1 from the top of the drying tower 1, passes through the drying section 12 and the cooling section 14 in the drying tower 1 in sequence, and is then sent out from the bottom of the drying tower 1. The ventilation pipe 121 is set as a triangular pipe with an upward angle and two adjacent layers of ventilation hangings are arranged in a staggered manner, so that the ventilation pipe 121 can achieve the effect of turning the grain during the falling process, so that the drying effect of the grain in the drying section 12 is improved.

[0034] Specifically, the drying tower 1 further includes a slow cooling section 13 , which is used to delay the time for the grain sent out from the drying section 12 to enter the cooling section 14 .

[0035] In the drying section 12, when the grain is dried by hot air, the main moisture taken away is the moisture on the surface of the grain. After drying, there is a huge difference in the moisture content between the inside and outside of the grain. The slow-cooling section 13 blocks the grain, so that when the grain enters the cooling section 14, the moisture inside the grain will move to the surface of the grain, thereby increasing the moisture on the surface of the grain. The grain is then sent to the cooling section 14, and the wind in the cooling section 14 can take away part of the moisture on the surface of the grain, thereby further drying the grain.

[0036] Specifically, a plurality of slow-release tubes 131 are arranged in the slow-release section 13, the top opening area of ​​the slow-release tube 131 is larger than the bottom opening area, the cross-section of the slow-release tube 131 perpendicular to its own length direction is funnel-shaped, and the plurality of slow-release tubes 131 are arranged along a horizontal direction perpendicular to its own length direction, and two adjacent slow-release tubes 131 are in contact with each other.

[0037] Specifically, a plurality of cooling pipes 141 are arranged in the cooling section 14. The cooling pipes 141 are divided into an air inlet cooling pipe 141 and an air outlet cooling pipe 141. The air inlet cooling pipe 141 is used to send the external cold air into the cooling section 14, and the air outlet cooling pipe 141 sends the air after cooling the grain out of the cooling section 14. There are several groups of cooling pipes 141, each group includes a plurality of cooling pipes 141, and the plurality of groups of cooling pipes 141 are arranged horizontally and parallel to each other. The plurality of cooling pipes 141 in the same group are arranged in a horizontal direction perpendicular to their own length direction. The plurality of cooling pipes 141 are arranged vertically, and two adjacent groups of cooling pipes 141 are arranged alternately along the horizontal arrangement direction of the cooling pipes 141. The air inlet cooling pipes 141 and the air outlet cooling pipes 141 are arranged alternately along the arrangement direction of the plurality of cooling pipes 141 in the same group.

[0038] Specifically, the drying tower 1 further includes a grain storage section 11 and a grain discharge section 15 . The grain storage section 11 is located at the top of the drying section 12 , and the grain discharge section 15 is located at the bottom of the cooling section 14 .

[0039] The top of the grain storage section 11 is arranged as a cone, with the tip of the cone facing upwards, and a grain feed pipe 17 for feeding grain into the grain storage section 11 is arranged at the top of the grain storage section 11, and a distributor located in the grain storage section 11 is arranged at the bottom of the grain feed pipe 17, and the distributor includes a rotating shaft 111 which is vertically arranged and coaxial with the grain storage section 11, and the rotating shaft 111 is rotatably connected to the drying tower 1, and a material balancing plate 112 is fixedly connected to the rotating shaft 111, and one side of the material balancing plate 112 is inclined downward so that the material balancing plate 112 can drive the rotating shaft 111 to rotate under the impact of the downwardly flowing grain, thereby dispersing the grain to the surroundings through the centrifugal force of the rotation.

[0040] Specifically, the grain discharging section 15 is configured as a cone with its tip facing downward, and a discharger 16 is disposed at the bottom of the grain discharging section 15 . The discharger 16 controls a switch at the bottom of the grain discharging section 15 to control the discharging of the grain.

[0041] Specifically, the bottom of the discharger 16 is connected to a conveyor, and the grains delivered by the discharger 16 are transported by the conveyor.

[0042] A bucket elevator 2 is provided on one side of the drying tower 1 , and the bucket elevator is used to transport grains to the grain inlet pipe 17 .

[0043] Specifically, the heat pump includes a heat pump evaporator 51, a heat pump condenser 52 and a heat pump compressor 53. The air after grain processing in the drying section 12 passes through the heat pump evaporator 51, absorbs residual heat in the air through the heat pump evaporator 51, and condenses the moisture in the air and sends it out; the heat pump condenser 52 is used to receive the air cooled and dried by the heat pump evaporator 51, and heats the air and sends it to the drying section 12; the heat pump compressor 53 is used to drive the condensing medium to circulate between the heat pump evaporator 51 and the heat pump condenser.

[0044] Specifically, the heat pump further includes a heat pump throttle valve 54 , the heat pump condenser 52 and the heat pump evaporator 51 are connected via two pipelines, the heat pump compressor 53 is disposed on one of the pipelines, and the heat pump throttle valve 54 is disposed on the other pipeline.

[0045] The circulation pipe 5 passes through the heat pump condenser and the heat pump evaporator 51 in sequence, and the two ends of the circulation pipe 5 are respectively connected to the air inlet ventilation pipe 121 and the air outlet ventilation pipe 121. The air sent out from the air outlet ventilation pipe 121 first enters the heat pump evaporator 51. After being cooled and dried, the air enters the heat pump condenser 52 for heating, and then is sent to the air inlet ventilation pipe 121.

[0046] Specifically, an absorber is provided at the air outlet end of the heat absorption pipeline 4, and the absorber extends into the part of the circulation pipe 5 located between the heat pump evaporator 51 and the heat pump condenser 52, so that the dry air that absorbs the waste heat of the exhaust gas enters the circulation pipe 5 and can flow to the heat pump condenser 52 to achieve air heating.

[0047] Specifically, the present embodiment further includes a dust collector 55 , which is used to filter and remove dust from the air sent out from the drying section 12 to prevent dust impurities in the air from clogging the heat pump evaporator 51 .

[0048] Embodiment 2: An air source heat pump intelligent drying system. The difference between this embodiment and embodiment 1 is that it also includes a PLC, an upper limit sensor 113 and a lower limit sensor 114. The upper limit sensor 113 and the lower limit sensor 114 are respectively located near the top and near the bottom of the grain storage section 11 in the drying tower 1. The upper limit sensor 113 and the lower limit sensor 114 are connected to the PLC; when the lower limit sensor 114 detects that no grain passes through, the PLC controls the bucket elevator 2 to start working and feed grain into the drying tower 1. When the upper limit sensor 113 detects grain, the PLC controls the elevator to stop working.

[0049] Specifically, this embodiment also includes a slow-heat section humidity sensor 133 and a slow-heat section temperature sensor 132 connected to the PLC. When the slow-heat section humidity sensor 133 detects that the moisture content of the grain is less than or equal to fourteen percent, the unloader 16 starts working to deliver the grain. When the slow-heat section humidity sensor 133 detects that the moisture content of the grain is greater than fourteen percent, the unloader 16 is closed and stops delivering the grain, so that the grain continues to be dried in the drying tower 1.

[0050] When the drying tower 1 just starts to work, the drying temperature in the drying tower 1 is relatively low. The setting of the humidity sensor in the slow recovery section 13 can prevent the grain that does not meet the drying standards from being sent out. As the drying proceeds, when the moisture content of the grain in the slow recovery section 13 reaches the drying requirements, the discharger 16 starts to work, and at this time the drying temperature in the drying tower 1 also reaches the drying requirements, so that the grain can often reach the moisture requirements after drying after passing through the drying section 12, thereby realizing the circulation operation of the drying tower 1.

[0051] Specifically, a hot air temperature sensor 58 is provided at a position near the end of the circulation pipe 5 connected to the air inlet ventilation pipe 121, an exhaust gas temperature sensor 56 and an exhaust gas humidity sensor 57 are provided at a position near the end of the circulation pipe 5 connected to the air outlet ventilation pipe 121, and a post-dehydration temperature sensor 59 is provided at a position between the heat pump evaporator 51 and the heat pump condenser 52 in the circulation pipe 5.

[0052] The grain discharging section 15 is provided with a grain discharging section humidity sensor 151 for detecting the humidity of the grain delivered by the grain discharging section 15 .

[0053] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An air source heat pump intelligent drying system, characterized in that: It comprises a drying tower (1), wherein the drying tower (1) comprises at least a drying section (12) and a cooling section (14); A heat pump, the heat pump being used to provide hot air to a drying section (12) of a drying tower (1); A cooling induced draft fan, the cooling induced draft fan is used to drive cold air to pass through the cooling section (14) of the drying tower (1) to cool the grain in the cooling section (14); and a cooling heat exchanger (3), the cooling heat exchanger (3) being used to transfer heat in the air sent out from the cooling section (14) of the drying tower (1) to the dry air and to send the dry air to the heat pump; The drying tower (1) further comprises a slow recovery section (13), wherein the slow recovery section (13) is used to delay the time for the grain sent out from the drying section (12) to enter the cooling section (14); A plurality of cooling pipes (141) are arranged in the cooling section (14), and the cooling pipes (141) are divided into air inlet cooling pipes (141) and air outlet cooling pipes (141). The air inlet cooling pipes (141) are used to send external cold air into the cooling section (14), and the air outlet cooling pipes (141) send the air after cooling the grain out of the cooling section (14); A plurality of ventilation pipes (121) are arranged in the drying section (12), and the ventilation pipes (121) are divided into air inlet ventilation pipes (121) and air outlet ventilation pipes (121), and the air inlet ventilation pipes (121) and the air outlet ventilation pipes (121) are arranged in a staggered manner in the drying section (12); The air inlet ventilation pipe (121) is used to deliver the air heated by the heat pump to the drying section (12), and the air outlet ventilation pipe (121) is used to deliver the air in the drying section (12) after heating and drying the grain; The ventilation pipe (121) is configured as a triangular pipe, and the ventilation pipe (121) is configured in the drying section (12) with one angle facing upward, one side of which is located at the bottom and horizontal, and the opening of the ventilation pipe (121) is located at the bottom of the ventilation pipe (121); The ventilation pipes (121) are arranged in a plurality of groups, each group comprising a plurality of ventilation pipes (121), the plurality of groups of ventilation pipes (121) are arranged horizontally and in parallel with each other, the plurality of ventilation pipes (121) in the same group are arranged in a horizontal direction perpendicular to their own length direction, the plurality of groups of ventilation pipes (121) are arranged vertically, and two adjacent groups of ventilation pipes (121) are arranged in a staggered manner along the horizontal arrangement direction of the ventilation pipes (121); The slow-release section (13) is provided with a plurality of slow-release tubes (131), the top opening area of ​​the slow-release tube (131) is larger than the bottom opening area, the cross section of the slow-release tube (131) perpendicular to its own length direction is arranged in a funnel shape, and the plurality of slow-release tubes (131) are arranged in a horizontal direction perpendicular to its own length direction, and two adjacent slow-release tubes (131) are fitted together; Multiple ventilation pipes in the same group are arranged with air inlet ventilation pipes and air outlet ventilation pipes staggered along the arrangement direction; The device also comprises a PLC, an upper limit sensor (113) and a lower limit sensor (114), wherein the upper limit sensor (113) and the lower limit sensor (114) are respectively located at the top and the bottom of the grain storage section (11) in the drying tower (1), and the upper limit sensor (113) and the lower limit sensor (114) are connected to the PLC; when the lower limit sensor (114) detects that no grain passes through, the PLC controls the bucket elevator (2) to start working and feed grain into the drying tower (1); when the upper limit sensor (113) detects that grain is present, the PLC controls the elevator to stop working; It also includes a humidity sensor for the slow drying section (13) and a temperature sensor for the slow drying section (13) connected to the PLC. When the humidity sensor for the slow drying section (13) detects that the moisture content of the grain is less than or equal to 14 percent, the discharger (16) starts to work and delivers the grain. When the humidity sensor for the slow drying section (13) detects that the moisture content of the grain is greater than 14 percent, the discharger (16) is closed and stops delivering the grain, so that the grain continues to be dried in the drying tower (1). A hot air temperature sensor (58) is provided at a position of the circulation pipe (5) close to one end connected to the air inlet ventilation pipe (121), an exhaust gas temperature sensor (56) and an exhaust gas humidity sensor (57) are provided at a position of the circulation pipe (5) close to one end connected to the air outlet ventilation pipe (121), and a post-dehydration temperature sensor (59) is provided at a position between the heat pump evaporator (51) and the heat pump condenser (52) in the circulation pipe (5); The grain discharging section (15) is provided with a grain discharging section (15) humidity sensor for detecting the humidity of grains delivered by the grain discharging section (15).

2. The air source heat pump intelligent drying system according to claim 1, characterized in that: The cooling tubes (141) are arranged in a plurality of groups, each group comprising a plurality of cooling tubes (141); the plurality of groups of cooling tubes (141) are arranged horizontally and in parallel with each other; the plurality of cooling tubes (141) in the same group are arranged in a horizontal direction perpendicular to their own length direction; the plurality of groups of cooling tubes (141) are arranged vertically; and two adjacent groups of cooling tubes (141) are arranged in a staggered manner along the horizontal arrangement direction of the cooling tubes (141).

3. The air source heat pump intelligent drying system according to claim 1, characterized in that: The heat pump comprises a heat pump evaporator (51), and the air after grain processing in the drying section (12) passes through the heat pump evaporator (51), and the heat pump evaporator (51) absorbs residual heat in the air and condenses moisture in the air and sends it out; A heat pump condenser (52), the heat pump condenser (52) is used to receive the air cooled and dried by the heat pump evaporator (51) and heat the air before sending it to the drying section (12); and a heat pump compressor (53), wherein the heat pump compressor (53) is used to drive the condensing medium to circulate between the heat pump evaporator (51) and the heat pump condenser.

4. The air source heat pump intelligent drying system according to claim 3 is characterized in that: It also includes a dust collector (55), which is used to filter and remove dust from the air sent out from the drying section (12) to prevent dust impurities in the air from clogging the heat pump evaporator (51).

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