Multi-temperature-zone drying device

Abstract

The utility model relates to the technical field, in particular to a multi-temperature-zone drying device which comprises a box body provided with a hollow cavity, a dehumidification system used for outputting dry gas with different temperatures and a conveying mechanism, and the hollow cavity of the box body is sequentially divided into a high-temperature zone, a medium-temperature zone and a low-temperature zone through partition plates. The high-temperature area, the medium-temperature area and the low-temperature area are communicated end to end, the dehumidification system is arranged in the high-temperature area, the medium-temperature area and the low-temperature area, and the conveying mechanism conveys articles to be dried to sequentially penetrate through the high-temperature area, the medium-temperature area and the low-temperature area. The multi-temperature multi-time drying is carried out on materials through the high-temperature area, the medium-temperature area and the low-temperature area, the drying efficiency is improved, the influence of high temperature on the quality of the materials is reduced, and the drying quality of the materials is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical fields more particularly to a multi-temperature zone drying device. BACKGROUND

[0002] Among many drying technologies, heat pump drying systems have been widely used in the field of drying and dehumidifying due to their high dehumidifying capacity. Traditional heat pump drying systems usually use a single condenser as a high-temperature heat source to heat and dry air, which is then introduced into a drying bin to dry wet materials such as agricultural crops.

[0003] A uniform drying hot air dryer and its drying method are disclosed in a Chinese patent, wherein the uniform drying hot air dryer includes a cylinder, four support columns symmetrically arranged in pairs are fixedly installed at the bottom of the cylinder, a charging hole is formed in the inner wall of the top of the cylinder, an end cover is threadedly installed in the charging hole, a vertical shaft is rotatably installed in the cylinder, a plurality of diamond-shaped stirring rods are fixedly installed at equal intervals on the vertical shaft, and horizontal rods are fixedly installed on the inner walls of both sides of the cylinder. However, this device can only dry materials at a single temperature. If high-temperature drying is used, the quality of the materials may be damaged, and if low-temperature drying is used, the drying efficiency may be affected. SUMMARY

[0004] The utility model aims at overcoming the deficiency that the prior art can only dry materials at a single temperature and provides a multi-temperature zone drying device that can dry materials at multiple temperatures to improve the drying quality of the materials.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of:

[0006] A multi-temperature zone drying device is provided, which includes a box body provided with a hollow cavity, a dehumidifying system for outputting dry air at different temperatures, and a conveying mechanism. The hollow cavity of the box body is divided into a high-temperature zone, a medium-temperature zone, and a low-temperature zone in sequence by a partition, and the high-temperature zone, the medium-temperature zone, and the low-temperature zone are connected at the head and tail. The dehumidifying system is arranged in the high-temperature zone, the medium-temperature zone, and the low-temperature zone. The conveying mechanism conveys the materials to be dried through the high-temperature zone, the medium-temperature zone, and the low-temperature zone in sequence.

[0007] With this arrangement, when the materials need to be dried, the user places the materials on the conveying mechanism, and the conveying mechanism moves the materials, allowing them to pass through the high-temperature zone, the medium-temperature zone, and the low-temperature zone in sequence. The dehumidifying system inputs dry air at high, medium, and low temperatures into the high-temperature zone, the medium-temperature zone, and the low-temperature zone, respectively. The high-temperature zone can quickly remove the surface moisture of the materials, the medium-temperature zone can uniformly dry the materials, and the low-temperature zone can prevent excessive drying from causing quality loss. This temperature zone drying method can control the drying rate by adjusting the temperature, which is beneficial to shorten the overall drying time and reduce the impact on the quality of the materials.

[0008] Preferably, the dehumidification system comprises a high-temperature dehumidification assembly, a medium-temperature dehumidification assembly and a low-temperature dehumidification assembly, the high-temperature dehumidification assembly is arranged in the high-temperature zone, the medium-temperature dehumidification assembly is arranged in the medium-temperature zone, and the low-temperature dehumidification assembly is arranged in the low-temperature zone.

[0009] Through this arrangement, the high-temperature dehumidification assembly is used to heat the air into high-temperature gas and dry, and the moisture content of the material can be quickly reduced by the high-temperature gas; the medium-temperature dehumidification assembly is used to heat the air into medium-temperature gas and dry, and the material is evenly dried by the medium-temperature gas, avoiding the influence of continuous high temperature on the quality of the material; the low-temperature dehumidification assembly is used to heat the air into low-temperature gas and dry, and the residual heat of the material in the previous process is taken away by the low-temperature gas, and the residual moisture in the material is dried by the dry gas, at this time, the residual moisture in the material is less, and although the drying efficiency of the low-temperature gas is low, it does not need more drying time, and the high-temperature dehumidification assembly, the medium-temperature dehumidification assembly and the low-temperature dehumidification assembly cooperate with each other to improve the drying efficiency of the dehumidification system as a whole.

[0010] Preferably, the high-temperature dehumidification assembly, the medium-temperature dehumidification assembly and the low-temperature dehumidification assembly are respectively provided with a high-temperature dehumidifier, a medium-temperature dehumidifier and a low-temperature dehumidifier.

[0011] The high-temperature dehumidification assembly, the medium-temperature dehumidification assembly and the low-temperature dehumidification assembly are respectively provided with a high-temperature heater, a medium-temperature heater and a low-temperature heater.

[0012] Through this arrangement, the high-temperature dehumidifier, the medium-temperature dehumidifier and the low-temperature dehumidifier are respectively used to dry the air in the high-temperature zone, the medium-temperature zone and the low-temperature zone, so as to avoid the influence of the increase of the moisture content of the air in the device after drying the material on the drying effect, and to improve the drying efficiency;

[0013] And heat exchange will occur in the process of drying the material and dehumidifying the air, part of the heat in the air will remain on the material, thereby causing the temperature of the air to decrease, and the continuous heating of the high-temperature heater, the medium-temperature heater and the low-temperature heater is conducive to keeping the gas temperature in the high-temperature zone, the medium-temperature zone and the low-temperature zone constant, avoiding the influence of the decrease of the gas temperature on the drying efficiency.

[0014] Preferably, the low-temperature dehumidification assembly further comprises a waste heat recovery pipe, one end of the waste heat recovery pipe is located at the air inlet of the low-temperature dehumidifier, and the other end of the waste heat recovery pipe is located at the air inlet of the low-temperature heater.

[0015] The principle of the dehumidifier is to reduce the temperature of the gas to condense the water in the gas into liquid droplets, thereby reducing the water content in the air. Through this arrangement, the air dried by the low-temperature dehumidifier will be cooled, and the air in the low-temperature zone will be heated to a suitable temperature by the low-temperature heater, and then the material will be dried. The dried air passes through one end of the waste heat recovery pipe, and then passes through the low-temperature dehumidifier to further reduce the temperature and humidity. Because the temperatures at both ends of the waste heat recovery pipe are not balanced, part of the heat contained in the gas before drying will flow through the waste heat recovery pipe to the gas after drying, which is at a lower temperature. The preheated dried gas then enters the low-temperature heater to be heated to a preset temperature, which helps to reduce the amount of heat required for heating and improve energy saving.

[0016] Preferably, the high-temperature heater, the medium-temperature heater and the low-temperature heater can also be connected to an external heat source, and the high-temperature heater, the medium-temperature heater and the low-temperature heater are in communication with the gas outlet of the external heat source.

[0017] Preferably, the heat source is a boiler, and the boiler is further provided with a heat transfer pipe, and the boiler is in communication with the high-temperature heater, the medium-temperature heater and the low-temperature heater through the heat transfer pipe.

[0018] Through this arrangement, the boiler produces high-temperature gaseous heat transfer medium, which flows into the high-temperature heater through the heat transfer pipe and exchanges heat with the gas in the high-temperature zone. The heat transfer medium that loses part of the heat changes to a gas-liquid coexistence state and continues to flow to the medium-temperature heater along the heat transfer pipe. In the medium-temperature heater, the heat transfer medium exchanges heat for the second time, and after losing part of the heat again, it becomes a liquid heat transfer medium. The liquid heat transfer medium continues to flow to the low-temperature heater along the heat transfer pipe and exchanges heat for the third time in the low-temperature heater. The heat transfer medium after three heat exchanges flows back to the boiler through the heat transfer pipe, absorbs heat in the boiler and changes to a gaseous state, and enters the next heat exchange cycle.

[0019] Preferably, the high-temperature zone, the medium-temperature zone and the low-temperature zone are all annular zones, and each of the high-temperature zone, the medium-temperature zone and the low-temperature zone is provided with a fan for controlling the flow of air.

[0020] By the arrangement, the fan controls the air flow along the annular structure in the high-temperature zone, the medium-temperature zone and the low-temperature zone respectively. In the high-temperature zone, the fan controls the air flow along the loop of the high-temperature heater, the conveying mechanism, the high-temperature dehumidifier and the high-temperature heater. In the medium-temperature zone, the fan controls the air flow along the loop of the medium-temperature heater, the conveying mechanism, the medium-temperature dehumidifier and the medium-temperature heater. In the low-temperature zone, the fan controls the air flow along the loop of the low-temperature heater, the conveying mechanism, the low-temperature dehumidifier and the low-temperature heater. The air flow is heated by the heater, and then dries the material on the conveying mechanism. The dried air flow is condensed by the dehumidifier to remove the moisture in the air. The condensed air is heated in the heater again and then enters the next drying cycle. This is beneficial to ensure that the air flow for drying is dry and maintains the rated temperature, and is beneficial to improve the drying efficiency.

[0021] Preferably, the high-temperature zone, the medium-temperature zone and the low-temperature zone are arranged in sequence from top to bottom. The high-temperature zone is provided with a material inlet at the top. The low-temperature zone is provided with a material outlet at the bottom. The material inlet is communicated with the inlet of the conveying mechanism. The material outlet is communicated with the outlet of the conveying mechanism.

[0022] By the arrangement, the user can put the material into the material inlet at the top of the high-temperature zone. The material falls into the conveying mechanism below. The conveying mechanism carries the material through the high-temperature zone, the medium-temperature zone and the low-temperature zone in sequence for drying. Finally, the dried material is discharged from the material outlet.

[0023] Preferably, the conveying mechanism comprises a plurality of conveying belts. The conveying belts are horizontally arranged and arranged in layers in the vertical direction. The conveying belts are further provided with communication ports at the ends. The conveying belts in the upper layer are communicated with the conveying belts in the next layer through the communication ports.

[0024] By the arrangement, when the material is put into the material inlet, it falls into the topmost conveying belt in the high-temperature zone. The material is dried by the high-temperature air while moving on the topmost conveying belt. When the material moves to the end of the topmost conveying belt, it falls into the next layer of conveying belt through the communication port, and the above process is repeated. The material passes through the conveying belts in different layers in sequence from top to bottom, and is dried in the high-temperature zone, the medium-temperature zone and the low-temperature zone in sequence. Finally, the dried material falls into the material outlet through the communication port at the end of the bottommost conveying belt.

[0025] Preferably, the conveying belt is further provided with a push plate. By the arrangement, when the material is accumulated or stuck on the conveying belt, the push plate can be pushed out to push the material and relieve the blockage.

[0026] Preferably, a filter screen is arranged in the high-temperature zone, the medium-temperature zone and the low-temperature zone respectively, and the conveying mechanism is arranged on one side of the high-temperature zone, the medium-temperature zone and the low-temperature zone, and the filter screen is arranged at the air inlet of the dehumidification system.

[0027] By the arrangement, when drying some materials with light weight, the materials can be prevented from being blown into the dehumidification system by the airflow, so as to affect the drying and temperature rising.

[0028] Preferably, the conveying mechanism is further provided with a plurality of guide plates, and the guide plates are arranged above the conveying belts.

[0029] By the arrangement, when the airflow passes above the conveying belts, the airflow has a downward flow trend under the action of the guide plates, so that the direction of the airflow is changed from parallel to the materials to coinciding with the materials, which is beneficial to increasing the drying effect of the airflow on the materials and improving the drying efficiency.

[0030] Preferably, the conveying belts are further provided with air-permeable holes for the airflow to pass through.

[0031] By the arrangement, the airflow can pass through the conveying belts to uniformly dry the materials on the conveying belts, which is beneficial to improving the drying quality.

[0032] Preferably, the high-temperature dehumidifier, the medium-temperature dehumidifier and the low-temperature dehumidifier all adopt finned heat exchangers for condensation dehumidification, and all comprise heat exchange pipe structures, and the high-temperature heater, the medium-temperature heater and the low-temperature heater are respectively provided with a first bypass pipe, a second bypass pipe and a third bypass pipe, the first bypass pipe connects the exhaust pipe of the high-temperature heater and the heat exchange pipe of the high-temperature dehumidifier, the second bypass pipe connects the exhaust pipe of the medium-temperature heater and the heat exchange pipe of the medium-temperature dehumidifier, and the third bypass pipe connects the exhaust pipe of the low-temperature heater and the heat exchange pipe of the low-temperature dehumidifier.

[0033] By the arrangement, the first bypass pipe, the second bypass pipe and the third bypass pipe can guide a small part of steam discharged from the heaters to the heat exchange pipes, so as to avoid that the heat exchange pipes are at too low temperature, thereby reducing the occurrence of frost formation of condensate, and being beneficial to reducing the maintenance cost of the device and prolonging the service life.

[0034] Compared with the prior art, the device has the following beneficial effects:

[0035] (1) The materials are dried in the high-temperature zone, the medium-temperature zone and the low-temperature zone in multiple temperature steps, which is beneficial to improving the drying efficiency, reducing the influence of high temperature on the quality of the materials and improving the drying quality of the materials.

[0036] (2) Through the setting of the boiler and the heat transfer pipe, the heat transfer effect of the heat transfer medium is fully utilized, multiple heat exchanges are realized, the heat in the heat transfer medium is fully utilized, the loss is reduced, and the energy saving effect is improved.

[0037] (3) Through the setting of the conveying mechanism, the goods can be fully dried during transportation, and the loss of the material during drying is reduced through the filter screen.

[0038] (4) Through the setting of the first bypass pipe, the second bypass pipe and the third bypass pipe, the frosting phenomenon of the dehumidifier due to too low temperature is avoided, the maintenance cost of the equipment is reduced, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 It is a structure schematic view of the multi-temperature zone drying device;

[0040] Fig. 2 It is a material conveying route schematic view of the multi-temperature zone drying device; (the dotted line in the figure is the conveying direction of the conveying mechanism)

[0041] Fig. 3 It is a gas flow loop schematic view of the multi-temperature zone drying device; (the dotted line in the figure is the gas flow direction)

[0042] Fig. 4 It is a third embodiment schematic view of the multi-temperature zone drying device.

[0043] The illustration marks are explained as follows:

[0044] 1, box; 11, partition; 12, high-temperature zone; 121, feeding port; 13, medium-temperature zone; 14, low-temperature zone; 141, discharging port; 2, dehumidification system; 21, high-temperature dehumidification assembly; 211, high-temperature dehumidifier; 212, high-temperature heater; 22, medium-temperature dehumidification assembly; 221, medium-temperature dehumidifier; 222, medium-temperature heater; 23, low-temperature dehumidification assembly; 231, low-temperature dehumidifier; 232, low-temperature heater; 233, waste heat recovery pipe; 24, fan; 25, boiler; 26, heat transfer pipe; 3, conveying mechanism; 31, conveying belt; 32, communication port; 33, guide plate; 4, filter screen; 5, first bypass pipe; 6, second bypass pipe; 7, third bypass pipe. DETAILED DESCRIPTION

[0045] The utility model makes further explanation in combination with specific implementation. Among them, the drawing is only for example explanation, and the representation is only a schematic diagram, and cannot be understood as the limitation to this patent; in order to better explain the embodiment of the utility model, some components of the drawing can be omitted, enlarged or reduced, and do not represent the size of actual product; for those skilled in the art, it is understandable that some well-known structures in the drawing and their description can be omitted.

[0046] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore the terms describing the position relationship in the drawing are only for example explanation, and cannot be understood as the limitation to this patent, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0047] Embodiment 1

[0048] As Figs. 1 to 3 The drawing is the first embodiment of a kind of multi-temperature zone drying device of the utility model, including the box body 1 being equipped with hollow cavity, the dehumidification system 2 for outputting different temperature drying gas and conveying mechanism 3, the hollow cavity of box body 1 is divided into high temperature zone 12, medium temperature zone 13 and low temperature zone 14 in turn by partition 11, and high temperature zone 12, medium temperature zone 13 and low temperature zone 14 are communicated at head and tail, and dehumidification system 2 is arranged in high temperature zone 12, medium temperature zone 13 and low temperature zone 14, conveying mechanism 3 conveys the article to be dried and passes through high temperature zone 12, medium temperature zone 13 and low temperature zone 14 in turn.

[0049] Through this setting mode, when the material needs to be dried, the user places the material on conveying mechanism 3, conveying mechanism 3 moves the material, and the material passes through high temperature zone 12, medium temperature zone 13 and low temperature zone 14 in turn, dehumidification system 2 respectively inputs high-temperature drying gas to high temperature zone 12, medium-temperature drying gas to medium temperature zone 13 and low-temperature drying gas to low temperature zone 14, high temperature zone 12 can quickly remove the surface moisture of material, medium temperature zone 13 can uniformly dry material, and low temperature zone 14 can prevent quality loss caused by excessive drying, and this temperature zone drying method can control drying rate through different temperatures, which is beneficial to shorten the overall drying time and reduce the influence on material quality.

[0050] As an embodiment of the utility model, the dehumidification system 2 includes high-temperature dehumidification assembly 21, medium-temperature dehumidification assembly 22 and low-temperature dehumidification assembly 23, the high-temperature dehumidification assembly 21 is installed in the high-temperature zone 12, the medium-temperature dehumidification assembly 22 is installed in the medium-temperature zone 13, and the low-temperature dehumidification assembly 23 is installed in the low-temperature zone 14.

[0051] Through the setting mode, the high-temperature dehumidification assembly 21 is used to heat air into high-temperature gas and dry, and the moisture content of the material can be quickly reduced through the high-temperature gas; the medium-temperature dehumidification assembly 22 is used to heat air into medium-temperature gas and dry, and the material is uniformly dried through the medium-temperature gas, avoiding the influence of continuous high temperature on the quality of the material; the low-temperature dehumidification assembly 23 is used to heat air into low-temperature gas and dry, and the residual heat of the material in the previous process is taken away by the low-temperature gas, and the residual moisture contained in the material is dried by the dry gas, at this time, the residual moisture in the material is less, and although the drying efficiency of the low-temperature gas is low, more drying time is not needed, and the high-temperature dehumidification assembly 21, the medium-temperature dehumidification assembly 22 and the low-temperature dehumidification assembly 23 cooperate with each other to improve the drying efficiency of the dehumidification system 2 as a whole.

[0052] As an embodiment of the utility model, the dehumidification system 2 includes high-temperature dehumidification assembly 21, medium-temperature dehumidification assembly 22 and low-temperature dehumidification assembly 23, the high-temperature dehumidification assembly 21 is installed in the high-temperature zone 12, the medium-temperature dehumidification assembly 22 is installed in the medium-temperature zone 13, and the low-temperature dehumidification assembly 23 is installed in the low-temperature zone 14.

[0053] Through the setting mode, the high-temperature dehumidification assembly 21, the medium-temperature dehumidification assembly 22 and the low-temperature dehumidification assembly 23 are respectively used to dry the air in the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14, so as to avoid the influence of the increase of the moisture content of the air in the device on the drying effect after the material is dried, and improve the drying efficiency;

[0054] And heat exchange is generated in the process of drying the material and dehumidifying the air, part of the heat in the air is left on the material, so as to cause the temperature of the air to be reduced, and the continuous heating of the high-temperature heater 212, the medium-temperature heater 222 and the low-temperature heater 232 is beneficial to keeping the gas temperature in the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 constant, avoiding the influence of the decrease of the gas temperature on the drying efficiency.

[0055] As an embodiment of the utility model, the low-temperature dehumidification assembly 23 further includes a waste heat recovery pipe 233, one end of the waste heat recovery pipe 233 is located at the air inlet of the low-temperature dehumidifier 231, and the other end of the waste heat recovery pipe 233 is located at the air inlet of the low-temperature heater 232.

[0056] The principle of the dehumidifier is to reduce the water content in the air by condensing the water in the gas into liquid drops by reducing the temperature of the gas; in this way, the air dried by the low-temperature dehumidifier 231 will be cooled, the air in the low-temperature zone 14 is heated to a suitable temperature by the low-temperature heater 232 first, and then the material is dried, the dried air passes through one end of the waste heat recovery pipe 233, and then passes through the low-temperature dehumidifier 231 to further reduce the temperature and humidity, and then flows through the other end of the waste heat recovery pipe 233, because the temperature of the two ends of the waste heat recovery pipe 233 is not balanced, part of the heat contained in the gas before drying will flow through the waste heat recovery pipe 233 to the gas after drying which has a lower temperature, thereby preheating the dried gas, and the preheated dried gas enters the low-temperature heater 232 to be heated to a preset temperature, which is beneficial to reduce the heat required for heating and improve the energy-saving effect.

[0057] As an embodiment of the present application, the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 are annular zones, and a fan 24 for controlling the flow of air is arranged in each of the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14.

[0058] In this way, the fan 24 controls the flow of air in the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 along the annular structure, in the high-temperature zone 12, the fan 24 controls the flow of air along the loop of the high-temperature heater 212, the conveying mechanism 3, the high-temperature dehumidifier 211 and the high-temperature heater 212; in the medium-temperature zone 13, the fan 24 controls the flow of air along the loop of the medium-temperature heater 222, the conveying mechanism 3, the medium-temperature dehumidifier 221 and the medium-temperature heater 222; in the low-temperature zone 14, the fan 24 controls the flow of air along the loop of the low-temperature heater 232, the conveying mechanism 3, the low-temperature dehumidifier 231 and the low-temperature heater 232, the air after being heated by the heater dries the material on the conveying mechanism 3, and the dried air then passes through the dehumidifier to remove the moisture in the air, the condensed air enters the heater to be reheated and then enters the next drying cycle, which is beneficial to ensure that the air used for drying is dry and maintains a rated temperature, and is beneficial to improve the drying efficiency.

[0059] Example 2

[0060] The following is a second embodiment of the multi-temperature zone drying device of the present application, which is similar to the first embodiment, except that the conveying mechanism 3 is further limited.

[0061] As an embodiment of the present application, the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 are arranged from top to bottom, the high-temperature zone 12 is provided with an inlet 121 at the top, and the low-temperature zone 14 is provided with an outlet 141 at the bottom, the inlet 121 is communicated with the inlet of the conveying mechanism 3, and the outlet 141 is communicated with the outlet of the conveying mechanism 3.

[0062] Through the setting mode, the user can put the material from the feeding port 121 at the top of the high-temperature zone 12, the material falls into the conveying mechanism 3, the conveying mechanism 3 carries the material to pass through the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 in turn, and finally sends the dried material out from the discharging port 141.

[0063] As an embodiment of the utility model, the conveying mechanism 3 includes a plurality of conveyors 31, the plurality of conveyors 31 are horizontally arranged and arranged in layers along the vertical direction, and the conveyors 31 are further provided with communication ports 32 at the ends, and the conveyors 31 in the upper layer are communicated with the conveyors 31 in the next layer through the communication ports 32.

[0064] Through the setting mode, when the material is put into the feeding port 121, the material falls into the topmost conveyor 31, the conveyor 31 is located in the high-temperature zone 12, and the material is dried by the high-temperature air during the movement on the topmost conveyor 31, when the material moves to the end of the topmost conveyor 31, the material falls into the next layer of conveyor 31 from the communication port 32, and the above process is repeated, and the material passes through the conveyors 31 in different layers from top to bottom, and is dried in the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 in turn, and finally the dried material is transferred into the discharging port 141 from the communication port 32 at the end of the bottommost conveyor 31.

[0065] As an embodiment of the utility model, the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14 are further provided with filter screens 4, the conveying mechanism 3 is arranged on one side of the high-temperature zone 12, the medium-temperature zone 13 and the low-temperature zone 14, and the filter screens 4 are arranged at the communication position between the conveying mechanism 3 and the dehumidification system 2.

[0066] Through the setting mode, when some light materials are dried, the materials can be prevented from being blown into the dehumidification system 2 under the action of the airflow, so that the drying and heating work is not affected.

[0067] As an embodiment of the utility model, the conveying mechanism 3 is further provided with a plurality of guide plates 33, and the guide plates 33 are arranged above the conveyors 31.

[0068] Through the setting mode, when the airflow passes above the conveyors 31, the airflow has a downward flow trend under the action of the guide plates 33, so that the direction of the airflow is changed from parallel to the material to intersecting with the material, which is beneficial to increase the drying effect of the airflow on the material and improve the drying efficiency.

[0069] As an embodiment of the utility model, the conveyors 31 are further provided with air holes for the airflow to pass through.

[0070] Through the setting mode, the air flow can pass through the conveying belt 31, and the materials on the conveying belt 31 are more uniformly dried, and the drying quality is improved.

[0071] Embodiment 3

[0072] As Figs. 1 to 4 The third embodiment of the multi-temperature zone drying device is shown, which is similar to the embodiment 2, and the difference is that the dehumidification system 2 is further limited.

[0073] As an embodiment of the utility model, the high temperature heater 212, the medium temperature heater 222 and the low temperature heater 232 can also be connected with a heat source, the high temperature heater 212, the medium temperature heater 222 and the low temperature heater 232 are communicated with the gas outlet of the connected heat source through the heat transfer pipe 26, the heat source is the boiler 25, and the heat transfer pipe 26 is also arranged, and the boiler 25 is communicated with the high temperature heater 212, the medium temperature heater 222 and the low temperature heater 232 in sequence through the heat transfer pipe 26.

[0074] Through the setting mode, the boiler 25 generates high-temperature gaseous heat transfer medium, the gaseous heat transfer medium flows into the high-temperature heater 212 through the heat transfer pipe 26, and exchanges heat with the gas in the high-temperature zone 12; the heat transfer medium that loses part of the heat changes into a gas-liquid coexisting state and continues to flow to the medium temperature heater 222 along the heat transfer pipe 26, and the heat transfer medium exchanges heat in the medium temperature heater 222 for the second time, and changes into liquid heat transfer medium after losing part of the heat again; the liquid heat transfer medium continues to flow to the low-temperature heater 232 along the heat transfer pipe 26, and exchanges heat in the low-temperature heater 232 for the third time, and the heat transfer medium after three times of heat exchange flows back to the boiler 25 through the heat transfer pipe 26, and is reabsorbed in the boiler 25 to change into a gaseous state and enter the next heat exchange cycle.

[0075] As an embodiment of the utility model, the high temperature dehumidifier 211, the medium temperature dehumidifier 221 and the low temperature dehumidifier 231 all adopt finned heat exchangers for condensation dehumidification, and all contain heat transfer pipe structures, the high temperature heater 212, the medium temperature heater 222 and the low temperature heater 232 are respectively provided with the first bypass pipe 5, the second bypass pipe 6 and the third bypass pipe 7, the first bypass pipe 5 communicates the exhaust pipe of the high temperature heater 212 with the heat transfer pipe of the high temperature dehumidifier 211, the second bypass pipe 6 communicates the exhaust pipe of the medium temperature heater 222 with the heat transfer pipe of the medium temperature dehumidifier 221, and the third bypass pipe 7 communicates the exhaust pipe of the low temperature heater 232 with the heat transfer pipe of the low temperature dehumidifier 231.

[0076] Through the setting mode, the first bypass pipe 5, the second bypass pipe 6 and the third bypass pipe 7 can guide the small part of steam discharged in the heater to the heat exchange pipe, avoid the heat exchange pipe from being at too low temperature, thereby reducing the condensate frost formation, and it is favorable to reduce the maintenance cost of the device and improve the service life.

[0077] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments are not required to be exhausted. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-temperature zone drying apparatus, characterized by, The utility model provides a drying device, including the box (1) that is equipped with hollow cavity, the dehumidification system (2) for outputting different temperature dry gas and conveying mechanism (3), the hollow cavity of box (1) is divided into high temperature area (12), medium temperature area (13) and low temperature area (14) by baffle (11) in turn, and high temperature area (12), medium temperature area (13) and low temperature area (14) are communicated in turn, and the dehumidification system (2) is arranged in high temperature area (12), medium temperature area (13) and low temperature area (14), and conveying mechanism (3) conveys the article to be dried and passes through high temperature area (12), medium temperature area (13) and low temperature area (14) in turn.

2. The multi-temperature zone drying apparatus according to claim 1, wherein, The dehumidification system (2) includes a high-temperature dehumidification assembly (21), a medium-temperature dehumidification assembly (22), and a low-temperature dehumidification assembly (23). The high-temperature dehumidification assembly (21) is installed in the high-temperature area (12), the medium-temperature dehumidification assembly (22) is installed in the medium-temperature area (13), and the low-temperature dehumidification assembly (23) is installed in the low-temperature area (14).

3. The multi-temperature zone drying apparatus of claim 2, wherein, The high-temperature dehumidification assembly (21), the medium-temperature dehumidification assembly (22), and the low-temperature dehumidification assembly (23) are respectively provided with a high-temperature dehumidifier (211), a medium-temperature dehumidifier (221), and a low-temperature dehumidifier (231). The high-temperature dehumidification assembly (21), the medium-temperature dehumidification assembly (22), and the low-temperature dehumidification assembly (23) are respectively provided with a high-temperature heater (212), a medium-temperature heater (222), and a low-temperature heater (232).

4. The multi-temperature zone drying apparatus according to claim 3, wherein The low-temperature dehumidification assembly (23) further includes a waste heat recovery pipe (233), one end of which is located at the air inlet of the low-temperature dehumidifier (231), and the other end of which is located at the air inlet of the low-temperature heater (232).

5. The multi-temperature zone drying apparatus according to claim 3, wherein The high-temperature heater (212), the medium-temperature heater (222), and the low-temperature heater (232) can also be externally connected to a heat source, and the high-temperature heater (212), the medium-temperature heater (222), and the low-temperature heater (232) are in communication with the air outlet of the external heat source.

6. The multi-temperature zone drying apparatus of claim 5, wherein, The external heat source is a boiler (25), and the boiler (25) is further provided with a heat transfer pipe (26). The boiler (25) is in communication with the high-temperature heater (212), the medium-temperature heater (222), and the low-temperature heater (232) through the heat transfer pipe (26).

7. The multi-zone drying apparatus according to any one of claims 1 to 6, wherein The high-temperature area (12), the medium-temperature area (13), and the low-temperature area (14) are all annular sections, and each of them is provided with a fan (24) for controlling the flow of air.

8. The multi-temperature zone drying apparatus of claim 7, wherein, The high-temperature area (12), the medium-temperature area (13), and the low-temperature area (14) are arranged in order from top to bottom. The high-temperature area (12) is provided with an inlet (121) at the top, and the low-temperature area (14) is provided with an outlet (141) at the bottom. The inlet (121) is in communication with the inlet of the conveying mechanism (3), and the outlet (141) is in communication with the outlet of the conveying mechanism (3).

9. The multi-temperature zone drying apparatus of claim 8, wherein, The conveying mechanism (3) is a belt conveying mechanism or a chain drive mechanism, which conveys the drying articles to sequentially pass through the high-temperature zone (12), the medium-temperature zone (13) and the low-temperature zone (14).

10. The multi-temperature zone drying apparatus of claim 9, wherein, The high-temperature zone (12), the medium-temperature zone (13) and the low-temperature zone (14) are respectively provided with a filter screen (4), the conveying mechanism (3) is arranged on one side of the high-temperature zone (12), the medium-temperature zone (13) and the low-temperature zone (14), and the filter screen (4) is arranged at the air inlet of the dehumidification system (2).

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