WO2019219040A1

WO2019219040A1 - Vacuum drying apparatus

Info

Publication number: WO2019219040A1
Application number: PCT/CN2019/087120
Authority: WO
Inventors: 周本留; 白树生; 许德运
Original assignee: 山东名流餐处装备股份有限公司
Priority date: 2018-05-15
Filing date: 2019-05-15
Publication date: 2019-11-21
Also published as: CN208186984U

Abstract

A vacuum drying apparatus, comprising a drying tank (11), agitation shafts (12), and an agitation motor (14). Agitation blades (16) are provided on the agitation shafts (12). Both ends of the agitation shafts (12) are separately and fixedly connected to the drying tank (11) by means of bearings and bearing seats, and the agitation shafts (12) are connected to the agitation motor (14). A heating element is provided inside an intermediate layer between an inner layer and an outer layer of the drying tank (11). The drying tank (11) consists of a lower centrally-split tank body and an upper centrally-split tank body, said lower and upper tank bodies being sealed and fixedly connected by means of a sealing ring and fixing bolts. A hollow cavity is provided inside the lower centrally-split tank body, the hollow cavity being provided with an electric heating device and a heat-conducting medium. The electric heating device is controlled by a control system, and the heat-conducting medium is in communication with a vacuum waste heat recovery apparatus. The present vacuum drying apparatus features a novel structure, stable operation, convenient replacement, high working efficiency, and a long service life.

Description

Vacuum drying device

Technical field

The utility model relates to the technical field of environmental protection equipment, in particular to a vacuum drying device.

Background technique

At present, the existing vacuum drying device generally comprises a fermentation tank and a stirring shaft, and the stirring shaft is provided with a stirring blade, and the two ends of the stirring shaft are fixedly connected with the fermentation tank through the bearing and the bearing seat respectively, wherein the fermentation tank is composed of the inner layer, The intermediate layer and the outer layer are formed, and a heat conducting oil is disposed between the intermediate layer and the outer layer, and an electric adding component is arranged on the bottom surface between the intermediate layer and the inner layer, and the intermediate layer is fixedly connected with the inner layer via the strut, the intermediate layer and the outer layer There is a temperature sensor in the interlayer, the top surface of the fermentation tank is provided with a feeding port, a feeding port and an exhaust port, the lower part of the side is provided with a discharging port, an automatic closing device is arranged on the feeding port, and a sealing door is arranged on the inoculating port. The discharge port is provided with a discharge door, and the automatic door closing device comprises a feeding door, an electric push rod, an electric push rod bracket, a positioning frame, a connecting rod, a guide rod, a right angle bending plate, a sealing pad, a hinge shaft, a positioning sleeve and The hinge shaft and the feeding door are arranged in the fermentation tank, the feeding door corresponds to the feeding port, the upper end of the feeding door is provided with a sealing pad, the lower end is fixedly connected with the right angle bending plate, and the two ends of the feeding door are respectively hinged Hinged to the positioning frame, the positioning frame is fixed in the fermentation On the inner top surface, an electric push rod bracket is fixed on the top surface of the fermenting tank corresponding to the positioning frame, the upper end of the electric push rod is fixedly connected with the electric push rod bracket, the lower end is fixedly connected with the guide rod, and the guide rod passes through the electric push rod bracket and the fermentation tank. The lower end of the hole provided on the positioning frame is hinged with the connecting rod, and the other end of the connecting rod is hinged with the other end of the right angle curved plate. The disadvantages are as follows: 1. When the equipment needs maintenance, since the drying tank and the sorting cylinder are all integral, the shaft and the drying tank, or the shaft and the sorting cylinder need to be separated by special equipment, which is very troublesome and time consuming.

2. During fermentation drying, the drying temperature is usually more than 140 degrees due to drying under reduced pressure. Not only does it generate a large amount of high-temperature steam, but also needs to be treated by an ionization deodorizing device. The drying time is long and the energy consumption is high. The steam is emitted to the outside, and because the temperature is too high, all the nutrients such as beneficial bacteria and protein contained in the kitchen waste are destroyed, and the nutrients such as protein contained in the kitchen waste are partially destroyed.

Summary of the invention

The utility model aims to solve the deficiencies of the prior art, and provides a vacuum drying device with novel structure, short processing time, low power consumption, environmental protection and odorless gas discharge, and high operational stability of the device.

The technical solution adopted by the utility model to solve the technical problems thereof is:

A vacuum drying device comprising a drying tank, a stirring shaft and a stirring motor, wherein the drying tank is composed of a lower middle slotted body and an upper middle slotted body, and the lower middle slotted body is sealed by a ring and The fixing bolt is fixedly and sealingly connected with the upper middle slotted body, wherein the lower middle slotted body is provided with a hollow inner cavity, wherein the hollow inner cavity is provided with an electric heating device and a heat conducting medium, and the electric heating device is controlled by a control system. The heat transfer medium is in communication with the vacuum waste heat recovery device to facilitate installation and maintenance.

The utility model can be provided with a sealing card slot on the circumference of the end face of the lower middle slotted body, and the sealing ring is positioned through the sealing card slot to achieve the quick installation effect.

The utility model can also be provided with a vacuum sealing device, which comprises an electric ball valve, a vacuum pump, a waste heat recovery device and a PLC controller. The electric ball valve is connected with the feeding port of the drying tank, and the steam outlet of the drying tank passes through the waste heat recovery device and The vacuum pump is connected, the electric ball valve, the waste heat recovery device and the vacuum pump are respectively connected with the PLC controller, and a vacuum negative pressure is formed in the drying tank by the operation of the vacuum pump, so that the pressure during the drying process is maintained at -0.081 to -0.099 MPa, not only It can kill the harmful bacteria in the kitchen waste which is fermented and dried in the drying tank, and retain the protein, cellulose and other nutrients beneficial to the livestock, so that the granules of the kitchen waste after fermentation drying meet the requirements of the Animal Husbandry Law. Forming livestock feed; moreover, the negative pressure reduces the boiling point of the water in the material, and the temperature in the drying tank is about 50-65 ° C, the water in the material can boil, without heating the material to 100 ° C, thereby greatly shortening the drying Time energy consumption; at the same time, through the waste heat recovery device, the odorous steam generated during the drying process is condensed to make the odor molecules Solutions of the condensed water discharged to the sewage treatment system, to avoid odors.

The stirring shaft, the stirring rod and the spiral blade in the drying tank of the utility model respectively adopt a structure in which a hollow phase communicates, and one end of the stirring shaft is provided with a rotary joint, and an inlet pipe is arranged in the inner cavity of the stirring shaft, and the inlet The water pipe and the inner wall of the stirring shaft are provided with a return water gap, one end of the water inlet pipe is connected to the water tank via a rotary joint, and the other end is closed, and the side wall of the water inlet pipe is connected to the inner cavity of the spiral blade through the water pipe of the stirring rod through the water pipe The spiral blade is provided with a water return hole, so that the water flows back through the return hole into the return water gap between the inlet pipe and the stirring shaft of the stirring shaft and flows back into the water tank, so as to facilitate absorption by the vacuum waste heat recovery device. The heat energy is transmitted to the stirring shaft and the stirring blade, and then the positive pressure heat in the hollow structure of the stirring shaft, the stirring blade repeatedly stirs and heats the material, and the tank interlayer heats the negative pressure of the material at a low pressure, which not only accelerates the tank body significantly. The drying rate of the material, and also significantly saves energy consumption.

The utility model has the advantages of novel structure, stable operation, convenient replacement, high work efficiency and long service life due to adopting the above structure.

DRAWINGS

1 is a schematic exploded view of the utility model.

Figure 2 is a schematic view of the structure of the present invention.

Figure 3 is a plan view of Figure 2.

Detailed ways

The present invention will be described below in conjunction with the accompanying drawings and embodiments.

As shown in the figure,

A vacuum drying device includes a drying tank 11, a stirring shaft 12, and a stirring motor 14. The stirring shaft 12 is provided with a stirring blade 16, and the two ends of the stirring shaft 12 are fixedly connected to the drying tank 11 through a bearing and a bearing housing, respectively. The shaft 12 is connected to the agitating motor 14, a heating element is arranged in the interlayer between the inner layer and the outer layer of the drying tank 11, a temperature sensor is arranged on the outer layer, and a discharging port is arranged in the lower part of the drying tank 11, and the discharging is provided. The outlet is provided with a discharge sealing door, characterized in that: the drying tank is composed of a lower middle slotted body and an upper middle slotted body, and the lower middle slotted body is sealed by a sealing ring and a fixing bolt and an upper middle slotted body a fixed sealing connection, the lower middle slotted body is provided with a hollow inner cavity, wherein the hollow inner cavity is provided with an electric heating device and a heat conducting medium, and the electric heating device is controlled by a control system, and the heat conducting medium and vacuum waste heat are recovered The devices are connected to facilitate installation and maintenance.

The utility model can also be provided with a vacuum sealing device, which comprises an electric ball valve 10, a vacuum pump 9, a waste heat recovery device and a PLC controller, and the electric ball valve 10 is connected with the feeding port of the drying tank 11, and the steam outlet of the drying tank 11 The waste heat recovery device is connected to the vacuum pump 9, and the electric ball valve 10, the waste heat recovery device and the vacuum pump 9 are respectively connected to the PLC controller, and a vacuum negative pressure is formed in the drying tank by the operation of the vacuum pump 9, so that the pressure during the drying process is maintained. From -0.081 to -0.099 MPa, it not only kills the harmful bacteria in the fermented and dried kitchen waste in the drying tank, but also preserves the protein, cellulose and other nutrients that are beneficial to the livestock, so that the dried and dried kitchen utensils The waste particles meet the requirements of the Animal Husbandry Law to form livestock feed; moreover, the negative pressure reduces the boiling point of the water in the material. When the temperature in the drying tank is around 50-65 °C, the water in the material can boil, and the temperature sensor will information. Uploaded to the PLC controller, the PLC controller instructs the heating element to stop heating, without heating the material to 100 ° C, thus greatly reducing the energy consumption of drying time; Through the waste heat recovery device, the odor-laden steam generated in the drying process is condensed, and the odor molecules are dissolved in the condensed water and discharged into the sewage treatment system, thereby avoiding the generation of odor.

The stirring shaft 12, the stirring rod 17 and the spiral blade 16 in the drying tank 11 of the present invention respectively adopt a structure in which a hollow phase communicates, and one end of the stirring shaft 12 is provided with a rotary joint, and the center of the inner cavity of the stirring shaft 12 is provided. The inlet pipe, the inlet pipe and the inner wall of the agitating shaft 12 are provided with a return water gap, one end of the inlet pipe is connected to the water tank via a swivel joint, the other end is closed, and the side wall of the inlet pipe passes through the water distribution pipe through the stirring rod The cavity is in communication with the inner cavity of the spiral blade 16, and the spiral blade 16 is provided with a water return hole, so that the water flows back through the return hole into the return water gap between the inlet pipe and the stirring shaft of the stirring shaft and flows back into the water tank. In order to facilitate the transfer of the absorbed heat energy to the stirring shaft 12 and the stirring blade through the vacuum waste heat recovery device 7, increasing the heat transfer area by repeatedly stirring and heating the material by the stirring blade, and heating the material by the tank interlayer, not only significantly speeds up The drying rate of the material in the tank, and also significantly saves energy consumption.

The vacuum waste heat recovery device of the present invention may adopt a heat pump technology, that is, it includes a refrigeration unit 56 and a refrigeration unit II 57. The refrigeration unit includes a compressor 58, a condenser 59, an expansion valve 60, and a surface cooler 61. The steam outlet of the drying tank 11 is sequentially connected to the air cooler 61 of the refrigeration unit 56 and the air cooler 61 of the refrigeration unit 257 and the vacuum pump 9 via the steam filter 30, so that the waste heat recovery process is at -0.081 to 0.099 MPa. Under pressure, the condenser 59 of the refrigeration unit (57) is connected to the flushing water tank 21 through a water pump; the condenser 59 of the refrigeration unit 56 may be disposed in the interlayer, or the condenser 59 may be disposed outside the drying tank through heat exchange. The circulation line communicates with the condenser 59 to facilitate absorption of the heat energy of the steam in the drying tank 11 by the vacuum waste heat recovery device 8, and the heat energy of the steam is transferred to the drying tank interlayer through the condenser 59, and is disposed in the drying tank 11 The material is dried, on the other hand, the heat energy is transferred to the flushing water tank, and the kitchen waste is washed by the salt-reducing and fat-reducing device 1, which not only realizes waste heat recovery, but also significantly saves Consumption, reduce the heating time.

When the utility model is in operation, the PLC controller opens the electric ball valve, the material enters into the drying tank, and then the electric ball valve is closed, and the PLC controller instructs the stirring motor to move, and drives the stirring shaft in the drying tank to stir and dry the material during the drying process. First, the electric heating element of the drying tank interlayer is firstly electrically heated by the PLC controller. When the temperature in the drying tank rises to 80 degrees Celsius, the electric heating is stopped, and the PLC controller starts the vacuum pump to start vacuuming the drying tank. When the vacuum degree in the drying tank reaches -0.06 MPa, the compressor heating cable stops, the compressor starts to enter the drying stage, and at the same time, the PLC controller instructs the waste heat recovery device 5 to operate, and the waste heat recovery device 5 dries the material in the drying device 4. After the steam generated in the process is heat exchanged, the steam is condensed to form a heat of the liquid waste heat recovery device. The heat of the steam is recovered by the waste heat recovery device to produce hot water of 50-120 ° C, wherein 50-120 ° C of hot water is transferred to the drying tank. In the hollow structure of the interlayer and the stirring shaft, the material in the drying tank is added through the drying tank and the stirring shaft and the stirring blade. Heat, another part to transfer heat energy to the flushing water tank 32, the hot water of 50-70 °C is washed by the desalting and degreasing device 1; during the heating process, the spiral blade on the stirring shaft is paste-like The kitchen waste is fully stirred to avoid uneven mixing of the kitchen waste in the drying tank and affect the dry quality. The pressure in the drying tank is kept at -0.081~-0.099MPa during the drying process, so that the boiling point in the drying tank is It can be boiled at 50-65 °C without heating to 100 °C, which not only accelerates the drying speed of the material in the tank, shortens the drying time, but also saves energy consumption. At the same time, the temperature is recovered by the vacuum waste heat recovery device. After the temperature is lowered, the condensed water with odor turned into a liquid state is discharged to a vacuum pump circulating water tank through a vacuum pump, and finally discharged into the sewage treatment system.

Claims

A vacuum drying device comprising a drying tank, a stirring shaft and a stirring motor, wherein the drying tank is composed of a lower middle slotted body and an upper middle slotted body, and the lower middle slotted body is sealed by a ring and The fixing bolt is fixedly and sealingly connected with the upper middle slotted body, wherein the lower middle slotted body is provided with a hollow inner cavity, wherein the hollow inner cavity is provided with an electric heating device and a heat conducting medium, and the electric heating device is controlled by a control system. The heat transfer medium is in communication with a vacuum waste heat recovery device.
A vacuum drying apparatus according to claim 1, wherein a sealing card groove is disposed on an end surface of the lower middle slotted body, and the sealing ring is positioned through the sealing card slot.
A vacuum drying device according to claim 1, characterized in that a vacuum sealing device is provided, which comprises an electric ball valve, a vacuum pump, a waste heat recovery device and a PLC controller, and the electric ball valve is connected to the feed port of the drying tank. The steam outlet of the drying tank is connected to the vacuum pump through a waste heat recovery device, and the electric ball valve, the waste heat recovery device and the vacuum pump are respectively connected to the PLC controller.
A vacuum drying apparatus according to claim 1, wherein the agitating shaft, the stirring rod and the spiral vane in the drying tank are respectively connected by a hollow phase, and one end of the stirring shaft is provided with a swivel joint, An inlet pipe is disposed in the inner cavity of the agitating shaft, and the inner wall of the inlet pipe and the agitating shaft is provided with a return water gap, and one end of the inlet pipe is connected to the water tank via a rotary joint, and the other end is closed, and the side wall of the inlet pipe is divided The water pipe communicates with the inner cavity of the spiral blade through the cavity of the stirring rod, and the spiral blade is provided with a water return hole.