CN219160874U - Multistage low-temperature material desiccator - Google Patents

Abstract

The utility model discloses a multistage low-temperature material drying machine, which comprises a control device and a plurality of low-temperature drying units, wherein each low-temperature drying unit comprises a frame, a rotary mesh belt drying area and a dehumidifying and preheating area which are separated from each other are arranged in the frame, a fan is arranged in the frame, a plurality of air inlets and air return inlets which are communicated with each other are arranged between the rotary mesh belt drying area and the dehumidifying and preheating area, and the dehumidifying and preheating area is provided with a cooling and dehumidifying device and a primary heater; the rotary mesh belt drying areas are sequentially communicated and provided with at least two layers of rotary mesh belt devices which are arranged up and down, each rotary mesh belt device comprises an annular rotary mesh belt, at least one rotary mesh belt device is provided with a secondary heater, and the secondary heater is arranged between an upper mesh belt and a lower mesh belt of the annular rotary mesh belt. The utility model does not need to prolong the length of the drier, and improves the treatment efficiency and effect of the drier under the same length.

Description

Multistage low-temperature material desiccator

Technical Field

The utility model relates to the technical field of drying treatment equipment for water-containing substances, in particular to a multistage low-temperature material drying machine.

Background

In modern life and industrial production, some water-containing substances often need to be dehydrated and dried, including food dehydration and drying, material dehydration and drying and the like.

The common drier in the prior art is provided with a belt drier, the main working principle is that a closed drying space is arranged, hot air is circulated in the drying space, meanwhile, a mesh belt type conveying device is used for loading materials to pass through the drying space, and the hot air evaporates and takes away the moisture of the materials, so that the purpose of drying the materials is achieved; in the existing belt drier, a plurality of groups of fans, dust removal and dehumidification devices and heaters are generally arranged along the conveying direction of a conveying belt, circulating air of the fans generated by the fans passes through the conveying belt from bottom to top, and then is heated by the heaters and enters the fans after dust removal and dehumidification; in use, for example, in order to reduce the length of the belt drier, a plurality of layers of conveying belts are arranged in the drier, so that materials are conveyed back and forth through the layers of conveying belts, the drying time is prolonged, and the drying efficiency is improved, but part of heat is lost after circulating air of a fan passes through the lower layers of conveying belts, the heat loss is larger when the circulating air reaches the top layer of conveying belts, the length of the drier is prolonged to ensure the drying effect, and the length of the drier is obviously opposite to that of the belt drier.

Disclosure of Invention

The utility model provides a multi-stage low-temperature material drying machine which does not prolong the length of the drying machine, increases a secondary heater and improves the treatment efficiency and effect, and aims to solve the problems of unbalanced heat transfer and insufficient top circulating air temperature of the existing multi-stage belt drying machine.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the multistage low-temperature material drying machine comprises a control device and a plurality of low-temperature drying units, wherein each low-temperature drying unit comprises a frame, a rotary mesh belt drying area and a dehumidifying and preheating area which are mutually separated are arranged in the frame, a fan is arranged in the frame, a plurality of mutually communicated air inlets and air inlets are arranged between the rotary mesh belt drying area and the dehumidifying and preheating area, and the dehumidifying and preheating area is provided with a cooling and dehumidifying device and a primary heater; the rotary mesh belt drying areas are sequentially communicated and provided with at least two layers of rotary mesh belt devices which are arranged up and down, each rotary mesh belt device comprises an annular rotary mesh belt, at least one rotary mesh belt device is provided with a secondary heater, and the secondary heater is arranged between an upper mesh belt and a lower mesh belt of the annular rotary mesh belt; one end of the rotary net belt device positioned at the top layer in the rotary net belt device is provided with a material inlet, and one end of the rotary net belt device positioned at the bottom layer in the rotary net belt device is provided with a material outlet; the fan is communicated with the air inlet or the air return opening, and an air circulation airflow is formed between the rotary mesh belt drying area and the dehumidifying and preheating area after the fan is started; the fan, the cooling and dehumidifying device, the primary heater, the rotary net belt device and the secondary heater are all connected with the control device.

In the scheme, the drying machine adopts a plurality of layers of rotary mesh belts, each layer of mesh belt is annular and is rotated by a driving roller and a driven roller, each layer of mesh belt consists of a rotary circulating belt, a tensioning mechanism, a driving rod, a punching rod, a speed reducer, a motor and the like, a heater is arranged between an upper circulating belt and a lower circulating belt of each layer of mesh belt, a secondary heater can be arranged in the upper layer of rotary mesh belt and also can be arranged in each layer of rotary mesh belt, and the purpose is to provide more heat for the drying machine and compensate heat loss after circulating air passes through the bottom rotary mesh belt and dried matters on the mesh belt; the secondary heater can adopt the same heat source as the primary heater, such as electric heat or waste heat, and can also adopt different heat sources, so that the drying efficiency and effect can be improved without prolonging the length of the drying machine, and the drying is convenient and flexible; in addition, the desiccator of this scheme can adopt a plurality of low temperature desiccation units, except that the head and the tail unit need seal the port and set up pan feeding mouth, discharge gate, and unit structure is basically the same, can realize the concatenation formula installation, and a plurality of rotation guipure drying zone promptly, dehumidification preheating zone communicate in proper order.

As a preferable scheme of the utility model, a plurality of pressurizing fans are arranged in the rotary mesh belt drying area, the pressurizing fans are arranged between the upper layer rotary mesh belt device and the lower layer rotary mesh belt device, and the wind directions of the pressurizing fans are consistent with the air circulation airflow directions. After passing through a layer of rotary net belt and the dried matters on the net belt, the fan circulating air has heat loss and wind pressure and wind speed loss, and the pressurized fan with the increased scheme is used for improving the wind pressure and wind speed of the fan circulating air and improving the drying efficiency and effect of the fan circulating air on the dried matters when passing through the layer of rotary net belt and the net belt.

As a preferable scheme of the utility model, a soot blower and a soot cleaning device are arranged in the rotary mesh belt drying area, the soot blower comprises a blower, a pipeline, a valve, a pressure air tank and a controller, the blower and the rotary mesh belt device are correspondingly arranged and are arranged above the annular rotary mesh belt, the blower is communicated with the pressure air tank through the pipeline and the valve, the controller is connected with the valve, and the soot cleaning device is arranged at the bottom of the rotary mesh belt drying area. After long-term use of the drier, impurities such as dust and the like are inevitably remained on the surface, air circulation is affected, abrasion of parts is increased, dust removal workload is also increased, the soot blower is adopted in the scheme, when dust needs to be cleaned, a controller opens a valve to start the soot blower, gas in a pressure gas tank is flushed out from a blower and blows the dust to the bottom of a rotary mesh belt drying area, the bottom of the rotary mesh belt drying area is automatically cleaned through the soot blower, and the soot blower is also adopted in part of the existing drier.

As a preferable scheme of the utility model, the fan is arranged at the bottom of the frame, circulating air of the fan upwards reaches a top layer return air inlet in the rotary mesh belt drying area from the bottom in the rotary mesh belt drying area and enters the dehumidification preheating area, then downwards reaches an inner bottom air inlet in the dehumidification preheating area from the top in the dehumidification preheating area and then enters the rotary mesh belt drying area, and the secondary heater is provided with a heating medium inlet and a heating medium outlet and is connected with a heat source through an inlet and outlet pipeline, a valve and a pump to form a heat flow loop.

As a preferable scheme of the utility model, the cooling and dehumidifying device comprises a dust remover and a cooler, wherein the dust remover is provided with a dust removing filter screen or a pulse dust remover, and the cooler is provided with a cooling medium inlet, a cooling medium outlet and a liquid receiving disc. The circulating air of the fan is provided with dust, and the dust is removed, cooled, dehumidified and changed into dry hot air again to dry the dried object.

As a preferable scheme of the utility model, the cooling and dehumidifying device comprises a one-stage or multi-stage atomization filtering chamber and a spray head arranged in the atomization filtering chamber, and the spray head is connected with an external gas tank and a medicament tank through a liquid adding pipe, a gas adding pipe, a valve and a pipeline. Harmful substances such as dust and odor are easy to generate in the drying process, dust can be removed by dust removal, the scheme adopts an atomization filter chamber, and hydrogen sulfide, ammonia and the like in the odor can be dissolved in water or are subjected to neutralization reaction with alkali solution carried in the water through spray treatment, so that the dryer can realize zero emission of harmful gas to the outside.

As a preferable scheme of the utility model, the fan comprises a first fan and a second fan, the cooling and dehumidifying device comprises a dust remover and a cooler, the first fan is arranged between the dust remover and the cooler, and the second fan is arranged at the air inlet. According to the scheme, the fan setting is optimized, the first fan is the main fan, negative pressure is formed on the upper portion of the rotary mesh belt drying area, circulating air is sucked to the dehumidification preheating area from the rotary mesh belt drying area, and the circulating air after waste heat is blown to the bottom of the rotary mesh belt drying area by the second fan and upwards passes through the rotary mesh belt.

As a preferable scheme of the utility model, a material guide plate is arranged between the upper layer rotary net belt device and the lower layer rotary net belt device, a fine net is arranged on the annular rotary net belt, an air leakage prevention distributing device or a strip extruding machine is arranged at a material inlet, and a material outlet is connected with a conveyor through an air closer. The guide plate of the scheme is used for guiding the dried object to drop from the upper layer rotary mesh belt to the lower layer rotary mesh belt; the function of the fine net is to prevent the large particles from directly falling down from the dried objects; the distributing device or the strip extruding machine can uniformly scatter the to-be-dried object onto the annular rotary mesh belt.

As a preferable scheme of the utility model, a fan air channel region is arranged between the rotary type mesh belt drying region and the dehumidifying and preheating region, a plurality of air channel openings which are respectively communicated with the rotary type mesh belt drying region and the dehumidifying and preheating region are arranged in the fan air channel region, an upper rotary mesh belt device and a lower rotary mesh belt device are arranged in the rotary type mesh belt drying region, the fan comprises an upper air supply fan and a lower air supply fan, the upper air supply fan and the lower air supply fan are arranged in the fan air channel region, independent air channels are respectively arranged between the upper air supply fan and the bottom of the upper rotary mesh belt device and between the lower air supply fan and the bottom of the lower rotary mesh belt device, air circulation air flows from the independent air channels through the upper rotary mesh belt device and the lower rotary mesh belt device and then enter the fan air channel region through the air channel openings, and then air circulation air flows from the air channel openings into the dehumidifying and preheating region. In the scheme, the circulating mode of circulating air is optimized, in a desiccator with only two layers of rotary mesh belts, two fans can be adopted to respectively supply air to the bottoms of the two layers of rotary mesh belts, and return air enters a dehumidification waste heat area for unified treatment; air circulating between the rotary mesh belt drying area and the dehumidifying and preheating area needs to pass through the fan air channel area, and a plurality of air inlets and air returns between the rotary mesh belt drying area and the dehumidifying and preheating area.

As a preferable scheme of the utility model, a fan air channel region is arranged between the rotary mesh belt drying region and the dehumidifying and preheating region, a plurality of air channel openings which are respectively communicated with the rotary mesh belt drying region and the dehumidifying and preheating region are arranged in the rotary mesh belt drying region, an upper rotary mesh belt device and a lower rotary mesh belt device are arranged in the rotary mesh belt drying region, the fan comprises an upper air supply fan, a lower air supply fan and a lower air supply fan, the upper air supply fan and the lower air supply fan are arranged at the air channel openings between the fan air channel region and the rotary mesh belt drying region, the upper air supply fan and the lower air supply fan are arranged in the fan air channel region, an air supply independent air channel is respectively arranged between the upper air supply fan and the top of the upper rotary mesh belt device, an air supply independent air channel is respectively arranged between the lower air supply fan and the top of the lower rotary mesh belt device, and the circulating air enters the rotary mesh belt drying region from the upper air supply device, the lower air supply fan and the dehumidifying and preheating region respectively, and the circulating air enters the rotary mesh belt drying region from the upper air supply device and the upper air supply channel independent air channel and the lower air supply device. In the dryer with only two layers of rotary mesh belts, two main fans can be adopted to respectively introduce air from the tops of the two layers of rotary mesh belts, and after the circulating air enters a dehumidification residual heat area for unified treatment, two air supply fans respectively supply air to the bottoms of the two layers of rotary mesh belts; air circulating between the rotary mesh belt drying area and the dehumidifying and preheating area needs to pass through the fan air channel area, and a plurality of air inlets and air returns between the rotary mesh belt drying area and the dehumidifying and preheating area.

As a preferable scheme of the utility model, an upper layer rotary mesh belt device, a middle layer rotary mesh belt device and a bottom layer rotary mesh belt device are arranged in the rotary mesh belt drying area, the fan comprises a main induced fan, a blower and a pressurized fan, the cooling and dehumidifying device comprises a dust remover and a cooler, a secondary heater is arranged between the upper layer rotary mesh belt device, the middle layer rotary mesh belt device and the upper and lower mesh belts of the bottom layer rotary mesh belt device, soot blowing devices are respectively arranged in the upper layer rotary mesh belt device, the middle layer rotary mesh belt device and the bottom layer rotary mesh belt device, the main induced fan is arranged in the dehumidifying and preheating area and between the dust remover and the cooler, the blower is arranged at an air inlet at the bottom of the rotary mesh belt drying area, the pressurized fan is arranged below the middle layer rotary mesh belt device and above the upper layer rotary mesh belt device, and a primary heater is arranged between the cooler and the second fan. The scheme is suitable for the desiccator adopting the three-layer rotary net belt.

As a preferable scheme of the utility model, the secondary heater is a secondary condenser, the primary heater is a primary condenser, the cooler is an evaporator, a regenerator, a compressor, a liquid storage tank, a filter, a pipeline, a cooling heat exchanger and an expansion valve which are matched with the primary condenser or the secondary condenser are arranged in the dehumidification preheating zone, the primary condenser is provided with a working medium inlet and a working medium outlet, the working medium inlet and the working medium outlet are connected with the evaporator through the pipeline, the compressor, the liquid storage tank, the filter, the expansion valve and the evaporator to form a medium working loop, and circulating air is subjected to heat exchange cooling with the evaporator and the reinforcing cooler after passing through the dust remover, the regenerator and the atomization filtering chamber, and then enters a rotary mesh belt drying zone through a fan after being heated by the primary condenser; the secondary condenser is provided with a heating working medium inlet and a heating working medium outlet, and is connected with a compressor, a liquid storage tank, a filter, an evaporator and an expansion valve which are arranged in the dehumidification preheating area through pipelines to form a working loop. The scheme is characterized in that the enhanced cooling heat exchanger is communicated with an external cooling tower, and when a plurality of working media circulate, a plurality of condensers can be connected with one path of compressor, a liquid storage tank, a filter, an evaporator and an expansion valve through a multi-way valve to form a working loop.

As a preferable scheme of the utility model, a primary heater and a cooling dehumidifier are arranged in the dehumidification preheating zone, the primary heater is provided with a heating medium inlet and a heating medium outlet, the heating medium inlet and the cooling medium outlet are connected with a heat source through a pipeline, a pump and a valve, the cooling dehumidifier is provided with a cooling medium inlet and a cooling medium outlet, the cooling dehumidifier is connected with a cold source through the pipeline, the pump and the valve to form a working loop, circulating air exchanges heat through the cooling dehumidifier, and then enters a rotary mesh belt drying zone through a fan after being heated by the primary heater; the secondary heater in the rotary mesh belt drying area is provided with a heating medium inlet and a heating medium outlet, and is connected with a heat source through a pipeline, a pump and a valve to form a working loop.

Compared with the prior art, the utility model has the beneficial effects that: the length of the drier is not required to be prolonged, and the treatment efficiency and the treatment effect of the drier are improved under the same length.

Drawings

Fig. 1 is a schematic diagram of a forward structure of the present utility model.

Fig. 2 is a schematic side view of a side view of the present utility model.

Fig. 3 is a schematic diagram of a forward structure of embodiment 1 of the present utility model.

Fig. 4 is a schematic side view of embodiment 1 of the present utility model.

Fig. 5 is a schematic diagram of a forward structure of embodiment 2 of the present utility model.

Fig. 6 is a schematic diagram of a forward structure of embodiment 3 of the present utility model.

Fig. 7 is a schematic diagram of a forward structure of embodiment 4 of the present utility model.

Fig. 8 is a schematic side view of embodiment 4 of the present utility model.

Fig. 9 is a schematic diagram of a heat pump of the present utility model operating with a single working medium cycle.

Fig. 10 is a schematic structural diagram of a heat pump working medium circulation tee of the present utility model.

Fig. 11 is a schematic structural diagram of a heat pump working medium circulation four-way joint according to the present utility model.

In the figure: 1. frame 2, rotary mesh belt drying zone 3, dehumidifying and preheating zone

4. Blower 5, air inlet 6, air return 7, cooling and dehumidifying device

8. Primary heater 9, rotary mesh belt device 10, and secondary heater

11. Pressurized fan 12, soot blower 13 and soot cleaning device

14. Fan duct area 15, feed inlet 16, air-tight discharge port

17. Distributor 41, first fan 42, second fan

43. Upper layer air supply fan 44, lower layer air supply fan 45, independent air duct

47. Upper layer induced air blower 49, lower layer induced air blower 71, dust remover

72. Cooler 73, atomizing filter chamber 74 and spray head

91. Endless rotary mesh belt 121, blower 122, and pipe

123. Valve 124, pressure gas tank 125, controller

302. Evaporator 303, regenerator 304, compressor

305. Liquid storage tank 306, filter 307 and pipeline

308. Enhanced cooling heat exchanger 309, expansion valve 310, cooling tower.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.

It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present, and when an element is referred to as being "connected" to the other element, it may be directly connected to the other element or intervening elements may also be present, the terms "vertical", "horizontal", "left", "right" and the like are used herein for the purpose of illustration only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs, and the terms used herein in this description of the utility model are for the purpose of describing particular embodiments only and are not intended to be limiting of the utility model, with the term "and/or" as used herein including any and all combinations of one or more of the associated listed items.

Referring to fig. 1-2, the present utility model provides a technical solution:

the multistage low-temperature material drying machine comprises a control device and a plurality of low-temperature drying units, wherein each low-temperature drying unit comprises a frame 1, a rotary mesh belt drying area 2 and a dehumidification preheating area 3 which are separated from each other are arranged in the frame 1, a fan 4 is arranged in the frame 1, a plurality of air inlets 5 and air return inlets 6 which are communicated with each other are arranged between the rotary mesh belt drying area 2 and the dehumidification preheating area 3, and the dehumidification preheating area 3 is provided with a cooling and dehumidifying device 7 and a primary heater 8; the rotary mesh belt drying areas 2 are sequentially communicated and provided with at least two layers of rotary mesh belt devices 9 which are arranged up and down, each rotary mesh belt device 9 comprises an annular rotary mesh belt 91, at least one rotary mesh belt device 9 is provided with a secondary heater 10, and the secondary heater 10 is arranged between an upper mesh belt and a lower mesh belt of the annular rotary mesh belt 91; a material inlet is formed in one end of the rotary net belt device 9 positioned at the top layer in the rotary net belt devices 9, and a material outlet is formed in one end of the rotary net belt device 9 positioned at the bottom layer in the rotary net belt devices; the fan 4 is communicated with the air inlet or the air return opening, and an air circulation airflow is formed between the rotary mesh belt drying area 2 and the dehumidifying and preheating area 3 after the fan 4 is started; the fan 4, the cooling and dehumidifying device 7, the primary heater 8, the rotary net belt device 9 and the secondary heater 10 are all connected with a control device.

A plurality of pressurizing fans 11 are arranged in the rotary mesh belt drying area 2, the pressurizing fans 11 are arranged between the upper layer rotary mesh belt device 9 and the lower layer rotary mesh belt device 9, and the wind directions of the pressurizing fans 11 are consistent with the air circulation airflow directions.

The soot blower 12 and the soot cleaning device 13 are arranged in the rotary mesh belt drying area 2, the soot blower 12 comprises a blower 121, a pipeline 122, a valve 123, a pressure air tank 124 and a controller 125, the blower 121 and the rotary mesh belt device 9 are correspondingly arranged and are arranged above or in the annular rotary mesh belt 91, the blower 121 is communicated with the pressure air tank 124 through the pipeline 122 and the valve 123, the controller 125 is connected with the valve 123, and the soot cleaning device 13 is arranged at the bottom of the rotary mesh belt drying area 2.

The fan 4 is arranged at the bottom of the frame 1, circulated air of the fan upwards reaches a top layer air return opening 6 in the rotary mesh belt drying area 2 from the bottom in the rotary mesh belt drying area 2 and enters the dehumidification preheating area 3, then downwards reaches an inner bottom air inlet 5 in the dehumidification preheating area 3 from the top in the dehumidification preheating area 3 and then enters the rotary mesh belt drying area 2, and the secondary heater 10 is provided with a heating medium inlet and a heating medium outlet and is connected with a heat source through an inlet and outlet pipeline, a valve and a pump to form a heat flow loop.

The cooling and dehumidifying device 7 comprises a dust remover 71 and a cooler 72, wherein the dust remover 71 is provided with a dust removing filter screen or a pulse dust remover, and the cooler 72 is provided with a cooling medium inlet, a cooling medium outlet and a liquid receiving disc.

The cooling and dehumidifying device 7 comprises a one-stage or multi-stage atomization filtering chamber 73 and a spray head 74 arranged in the atomization filtering chamber 73, and the spray head is connected with an external gas tank and a medicament tank through a liquid adding pipe, a gas adding pipe, a valve and a pipeline.

A material guide plate is arranged between the upper layer rotary net belt device 9 and the lower layer rotary net belt device 9, a fine net is arranged on the annular rotary net belt, an air leakage prevention distributing device or a strip extruding machine is arranged at a material inlet, and a material outlet is connected with a conveyor through an air closer.

In embodiment 1, referring to fig. 3-4, the fan 4 includes a first fan 41 and a second fan 42, the cooling and dehumidifying device 7 includes a dust remover 71, a cooler 72, and an atomization filter chamber 73, the first fan 41 is disposed between the dust remover 71, the atomization filter chamber 73 and the cooler 72, and the second fan 42 is disposed at the air inlet 5.

In embodiment 2, referring to fig. 5, a fan air duct area 14 is arranged between a rotary type mesh belt drying area 2 and a dehumidifying and preheating area 3, a plurality of air duct openings respectively communicated with the rotary type mesh belt drying area 2 and the dehumidifying and preheating area 3 are arranged in the fan air duct area 14, an upper layer rotary mesh belt device 9 and a lower layer rotary mesh belt device 9 are arranged in the rotary type mesh belt drying area 2, the fan 4 comprises an upper layer air supply fan 43 and a lower layer air supply fan 44, the upper layer air supply fan 43 and the lower layer air supply fan 44 are arranged in the fan air duct area 14, independent air ducts 45 are respectively arranged between the upper layer air supply fan 43 and the bottom of the upper layer rotary mesh belt device 9 and between the lower layer air supply fan 44 and the bottom of the lower layer rotary mesh belt device 9, air circulation air flows from the independent air ducts 45 through the upper layer rotary mesh belt device 9 and the lower layer rotary mesh belt device 9 and then enters the fan area 14 through the air duct openings, air circulation air flows from the air duct openings into the dehumidifying and preheating area 3, a partition plate is arranged between the upper layer rotary mesh belt device 9 and the lower layer rotary mesh belt device 9, and no air can blow from the upper layer rotary mesh belt device 9 to the upper layer rotary mesh belt device 9.

In example 3, referring to fig. 6, a fan duct area 14 is arranged between a rotary mesh belt drying area 2 and a dehumidifying and preheating area 3, the fan duct area 14 is provided with a plurality of air duct openings which are respectively communicated with the rotary mesh belt drying area 2 and the dehumidifying and preheating area 3, an upper rotary mesh belt device 9 and a lower rotary mesh belt device 9 are arranged in the rotary mesh belt drying area 2, the fans comprise an upper air supply fan 43, an upper air supply fan 47, a lower air supply fan 44 and a lower air supply fan 49, the upper air supply fan 43 and the lower air supply fan 44 are arranged at the air duct opening between the fan duct area 14 and the rotary mesh belt drying area 2, the upper air supply fan 47 and the lower air supply fan 49 are arranged in the fan duct area 14, an independent air duct is respectively arranged between the upper air supply fan 47 and the top of the upper rotary mesh belt device 9, an independent air duct is respectively arranged between the lower air supply fan 49 and the top of the lower rotary mesh belt device 9, an independent air supply duct is respectively arranged between the upper air supply fan 43, the lower air supply fan 44 and the dehumidifying area 3, and circulating air passes through the rotary mesh belt drying area 9 from the upper mesh belt drying area 9, and the upper mesh belt drying area 9 and the upper mesh belt 9 passes through the rotary mesh belt 9.

In embodiment 4, referring to fig. 7-8, an upper layer rotary mesh belt device 9, a middle layer rotary mesh belt device 9 and a bottom layer rotary mesh belt device 9 are arranged in a rotary mesh belt drying area 2, a fan 4 comprises a first fan 41, a second fan 42 and a pressurizing fan 11, a cooling and dehumidifying device 7 comprises a dust remover 71 and a cooler 72, a secondary heater 10 is arranged between the upper layer rotary mesh belt device 9, the middle layer rotary mesh belt device 9 and the upper and lower mesh belts of the bottom layer rotary mesh belt device 9, a soot blower 12 is respectively arranged in the upper layer rotary mesh belt device 9, the middle layer rotary mesh belt device 9 and the bottom layer rotary mesh belt device 9, the first fan 41 is arranged in a dehumidifying and preheating area 3, the second fan 42 is arranged between the rotary mesh belt drying area 2 and the bottom air inlet 5 of the dehumidifying and preheating area 3, the pressurizing fan 11 is arranged below the upper layer rotary mesh belt device 9 and above the middle layer rotary mesh belt device 9, and a primary heater 8 is arranged between the cooler 72 and the second fan 42.

The specific use process is as follows:

the fan 4 drives the circulating air of the fan to upwards reach the top layer air return opening 6 in the rotary mesh belt drying area 2 from the bottom in the rotary mesh belt drying area 2 and enter the dehumidifying and preheating area 3, and in the process, the circulating air of the fan carries heat to pass through the rotary mesh belt device 9 to heat the drying material and take away water vapor, and the secondary heater 10 supplements heat for the circulating air of the fan; the circulating air of the fan enters the dehumidification and preheating zone 3 and downwards from the inner top of the dehumidification and preheating zone 3, and reaches the inner bottom of the dehumidification and preheating zone 3 after dust removal and cooling and dehumidification treatment, and then enters the rotary mesh belt drying zone 2 from the air inlet 5 communicated with the rotary mesh belt drying zone 2 from the bottom of the dehumidification and preheating zone 3 after being heated by the primary heater 8.

In embodiment 1, the first fan 41 is a main fan, a negative pressure is formed at the upper part of the rotary mesh belt drying zone 2, circulating air is sucked from the rotary mesh belt drying zone 2 to the dehumidifying and preheating zone 3, dust removal, cooling and dehumidifying treatment are performed, the circulating air is heated by the primary heater 8 after cooling, the heated circulating air is blown to the bottom of the rotary mesh belt drying zone 2 by the second fan 42 and passes through the plurality of rotary mesh belt devices 9 upwards, the secondary heater 10 supplements heat to the circulating air, and the pressurizing fan 11 pressurizes and accelerates the circulating air.

In embodiment 2, the fan circulation air passes through the upper layer rotation mesh belt device 9 and the lower layer rotation mesh belt device 9 from the independent air duct 45 respectively, then enters the fan air duct area 14 through the air duct opening, and then enters the dehumidifying and preheating area 3 from the air duct opening.

In the embodiment 3, circulating air enters the dehumidifying and preheating zone 3 from the top of the upper layer rotary mesh belt device 9 and the lower layer rotary mesh belt device 9 through the induced air independent air duct, and then enters the rotary mesh belt drying zone 2 from the air supply independent air duct and passes through the upper layer rotary mesh belt device 9 and the lower layer rotary mesh belt device 9 respectively.

In embodiment 4, the first fan 41 forms a negative pressure at the upper part of the rotary mesh belt drying area 2, sucks the circulating air from the rotary mesh belt drying area 2 to the dehumidifying and preheating area 3, performs dust removal and cooling and dehumidifying treatment, heats the circulating air by the primary heater 8 after cooling, blows the heated circulating air to the bottom of the rotary mesh belt drying area 2 by the second fan 42 and passes through the rotary mesh belt device 9 upwards, the secondary heater 10 in each layer of rotary mesh belt device 9 supplements heat to the circulating air, and the pressurizing fan 11 pressurizes and accelerates the circulating air.

The primary heater 8 and the secondary heater 10 can supply heat by adopting the following heat pump operation modes:

as shown in fig. 9, a single working medium circulation arrangement structure is adopted, as shown in fig. 10, a working medium circulation tee arrangement structure is adopted, as shown in fig. 11, a working medium circulation four-way arrangement structure is adopted,

the secondary heater 10 is a secondary condenser, the primary heater 8 is a primary condenser, the cooler 72 is an evaporator, an evaporator matched with the primary condenser or the secondary condenser, the regenerator 303, the compressor 304, the liquid storage tank 305, the filter 306, the pipeline 307, the enhanced cooling heat exchanger 308 and the expansion valve 309 are arranged in the dehumidification preheating zone 3, the primary heater 8 is provided with a working medium inlet and a working medium outlet, the working medium inlet and the working medium outlet are connected through the pipeline 307, the compressor 304, the liquid storage tank 305, the filter 306, the expansion valve 309 and the evaporator to form a medium working circuit, and circulating air is subjected to heat exchange cooling with the evaporator and the enhanced cooling heat exchanger 308 after passing through the dust remover 71, the regenerator 303 and the atomization filtering chamber 73, then enters the rotary mesh belt drying zone 2 through a fan after being heated through the primary condenser; the secondary condenser is provided with a heating working medium inlet and a heating working medium outlet, and is connected with a compressor 304, a liquid storage tank 305, a filter 306, an evaporator and an expansion valve 309 which are arranged in the dehumidifying and preheating zone 3 through pipelines to form a working loop, and the enhanced cooling heat exchanger 308 is communicated with an external cooling tower 310; when the working media circulate, the condensers are connected with one path of compressor, liquid storage tank, filter, evaporator and expansion valve through the multi-way valve to form a working loop.

Or the primary heater 8 and the secondary heater 10 can supply heat in a waste heat operation mode, and an external heat source and a cold source are connected with the heater and the cooling device;

the dehumidifying and preheating zone 3 is provided with a primary heater 8 and a cooling and dehumidifying device 7, the primary heater 8 is respectively provided with a heating medium inlet and a heating medium outlet, the primary heater 8 is connected with a heat source through a pipeline, a pump and a valve, the cooling and dehumidifying device 7 is provided with a cooling medium inlet and a cooling medium outlet, the cooling and dehumidifying device 7 is connected with a cold source through the pipeline, the pump and the valve to form a working loop, circulating air exchanges heat through the cooling and dehumidifying device 7, and then enters the rotary mesh belt drying zone 2 through a fan after being heated by the primary heater 8; the secondary heater 10 in the rotary mesh belt drying area 2 is provided with a heating medium inlet and a heating medium outlet, and is connected with a heat source through a pipeline, a pump and a valve to form a working loop.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (13)

1. The utility model provides a multistage low temperature material desiccator, includes controlling means, a plurality of low temperature desiccation unit, and low temperature desiccation unit includes the frame, is equipped with rotation guipure drying zone, dehumidification preheating zone of mutual partition in the frame, its characterized in that: a fan is arranged in the frame, a plurality of air inlets and air return inlets which are mutually communicated are arranged between the rotary mesh belt drying area and the dehumidifying and preheating area, and the dehumidifying and preheating area is provided with a cooling and dehumidifying device and a primary heater;

the rotary mesh belt drying areas are sequentially communicated and provided with at least two layers of rotary mesh belt devices which are arranged up and down, each rotary mesh belt device comprises an annular rotary mesh belt, at least one rotary mesh belt device is provided with a secondary heater, and the secondary heater is arranged between an upper mesh belt and a lower mesh belt of the annular rotary mesh belt;

one end of the rotary net belt device positioned at the top layer in the rotary net belt device is provided with a material inlet, and one end of the rotary net belt device positioned at the bottom layer in the rotary net belt device is provided with a material outlet;

the fan is communicated with the air inlet or the air return opening, and an air circulation airflow is formed between the rotary mesh belt drying area and the dehumidifying and preheating area after the fan is started;

the fan, the cooling and dehumidifying device, the primary heater, the rotary net belt device and the secondary heater are all connected with the control device.

2. The multi-stage low-temperature material drying machine according to claim 1, wherein: the rotary mesh belt drying area is internally provided with a plurality of pressurized fans, the pressurized fans are arranged between the upper layer rotary mesh belt device and the lower layer rotary mesh belt device, and the wind direction of the pressurized fans is consistent with the air circulation airflow direction.

3. The multi-stage low-temperature material drying machine according to claim 1, wherein: the rotary type mesh belt drying area is internally provided with a soot blower and a soot cleaning device, the soot blower comprises a blower, a pipeline, a valve, a pressure air tank and a controller, the blower and the rotary mesh belt device are correspondingly arranged and are arranged above the annular rotary mesh belt, the blower is communicated with the pressure air tank through the pipeline and the valve, the controller is connected with the valve, and the soot cleaning device is arranged at the bottom of the rotary type mesh belt drying area.

4. The multi-stage low-temperature material drying machine according to claim 1, wherein: the secondary heater is provided with a heating medium inlet and a heating medium outlet, and is connected with a heat source through an inlet and outlet pipeline, a valve and a pump to form a heat flow loop.

5. The multi-stage low-temperature material drying machine according to claim 1, wherein: the cooling and dehumidifying device comprises a dust remover and a cooler, wherein the dust remover is provided with a dust removing filter screen or a pulse dust remover, and the cooler is provided with a cooling medium inlet, a cooling medium outlet and a liquid receiving disc.

6. The multi-stage low-temperature material drying machine according to claim 5, wherein: the cooling and dehumidifying device comprises a one-stage or multi-stage atomization filtering chamber and a spray head arranged in the atomization filtering chamber, wherein the spray head is connected with the medicament tank through a liquid adding pipe, a gas adding pipe, a valve, a pipeline and an external gas tank.

7. The multi-stage low-temperature material drying machine according to claim 1, wherein: the fan include first fan, second fan, cooling dehydrating unit include dust remover, cooler, first fan locate between dust remover and the cooler, second fan locate air intake department.

8. A multi-stage low temperature material dryer according to claim 2, wherein: the upper layer rotary net belt device and the lower layer rotary net belt device are provided with a material guide plate therebetween, the annular rotary net belt is provided with a fine net, the material inlet is provided with an air leakage prevention distributing device or a strip extruding machine, and the material outlet is connected with the conveyor through an air closer.

9. The multi-stage low-temperature material drying machine according to claim 1, wherein: the air circulation device comprises a rotary mesh belt drying area and a dehumidifying and preheating area, wherein a fan air channel area is arranged between the rotary mesh belt drying area and the dehumidifying and preheating area, a plurality of air channel openings which are respectively communicated with the rotary mesh belt drying area and the dehumidifying and preheating area are arranged in the rotary mesh belt drying area, an upper layer rotary mesh belt device and a lower layer rotary mesh belt device are arranged in the rotary mesh belt drying area, the fan comprises an upper layer air supply fan and a lower layer air supply fan, the upper layer air supply fan and the lower layer air supply fan are arranged in the fan air channel area, independent air channels are respectively arranged between the upper layer air supply fan and the bottom of the upper layer rotary mesh belt device and between the lower layer air supply fan and the bottom of the lower layer rotary mesh belt device, air circulation air flows from the independent air channels through the air channel openings to enter the fan air channel area after passing through the upper layer rotary mesh belt device and the lower layer rotary mesh belt device, and then air circulation air flows from the air channel openings to the dehumidifying and preheating area.

10. The multi-stage low-temperature material drying machine according to claim 1, wherein: the rotary type mesh belt drying zone is characterized in that a fan air channel zone is arranged between the rotary type mesh belt drying zone and the dehumidifying and preheating zone, a plurality of air channel ports which are respectively communicated with the rotary type mesh belt drying zone and the dehumidifying and preheating zone are arranged in the rotary type mesh belt drying zone, an upper rotary mesh belt device and a lower rotary mesh belt device are arranged in the rotary type mesh belt drying zone, the fan comprises an upper air supply fan, a lower air supply fan and a lower air supply fan, the upper air supply fan and the lower air supply fan are arranged at the air channel ports between the fan air channel zone and the rotary type mesh belt drying zone, the upper air supply fan and the lower air supply fan are arranged in the fan air channel zone, an air supply independent air channel is respectively arranged between the upper air supply fan and the upper rotary type mesh belt device, between the lower air supply fan and the top of the lower rotary type mesh belt device, and the upper rotary type mesh belt drying zone, and circulating air respectively enters the rotary type mesh belt drying zone from the upper rotary type mesh belt drying zone, the lower rotary type mesh belt drying zone and the rotary type mesh belt drying zone through the upper rotary type mesh belt drying zone independent air supply channel.

11. The multi-stage low-temperature material drying machine according to claim 1, wherein: the device is characterized in that an upper layer rotary mesh belt device, a middle layer rotary mesh belt device and a bottom layer rotary mesh belt device are arranged in the rotary mesh belt drying area, the fan comprises a main induced fan, an air blower and a pressurizing fan, the cooling and dehumidifying device comprises a dust remover and a cooler, a secondary heater is arranged between the upper layer rotary mesh belt device, the middle layer rotary mesh belt device and the upper and lower mesh belts of the bottom layer rotary mesh belt device, the dust blowing devices are respectively arranged on the upper layer rotary mesh belt device, the middle layer rotary mesh belt device and the bottom layer rotary mesh belt device, the main induced fan is arranged in the dehumidifying and preheating area and between the dust remover and the cooler, the air blower is arranged at the air inlet of the bottom of the rotary mesh belt drying area, the pressurizing fan is arranged below the upper layer rotary mesh belt device and above the middle layer rotary mesh belt device, and a primary heater is arranged between the cooler and the second fan.

12. The multi-stage low temperature material dryer of claim 11, wherein: the secondary heater is a secondary condenser, the primary heater is a primary condenser, the cooler is an evaporator, a regenerator, a compressor, a liquid storage tank, a filter, a pipeline, a cooling heat exchanger and an expansion valve which are matched with the primary condenser or the secondary condenser are arranged in the dehumidification preheating zone, the primary condenser is provided with a working medium inlet and a working medium outlet, a medium working loop is formed by connecting the pipeline, the compressor, the liquid storage tank, the filter, the expansion valve and the evaporator, and circulating air is subjected to heat exchange cooling with the evaporator and the reinforcing cooler after passing through the dust remover, the regenerator and the atomization filtering chamber, and then enters a rotary mesh belt drying zone through a fan after being heated by the primary condenser; the secondary condenser is provided with a heating working medium inlet and a heating working medium outlet, and is connected with a compressor, a liquid storage tank, a filter, an evaporator and an expansion valve which are arranged in the dehumidification preheating area through pipelines to form a working loop.

13. The multi-stage low-temperature material drying machine according to claim 1, wherein: the primary heater is provided with a heating medium inlet and a heating medium outlet, and is connected with a heat source through a pipeline, a pump and a valve, the cooling dehumidifying device is provided with a cooling medium inlet and a cooling medium outlet, and is connected with a cold source through a pipeline, a pump and a valve to form a working loop, circulating air exchanges heat through the cooling dehumidifying device, and then enters a rotary mesh belt drying area through a fan after being heated by the primary heater; the secondary heater in the rotary mesh belt drying area is provided with a heating medium inlet and a heating medium outlet, and is connected with a heat source through a pipeline, a pump and a valve to form a working loop.

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