CN111219974A

CN111219974A - Low-energy-consumption drying device and drying method thereof

Info

Publication number: CN111219974A
Application number: CN202010142503.8A
Authority: CN
Inventors: 陈俊伟
Original assignee: Suzhou Huanchuan Energy Saving Equipment Co ltd
Current assignee: Suzhou Huanchuan Energy Saving Equipment Co ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-06-02

Abstract

The invention discloses a low-energy-consumption drying device and a drying method thereof, wherein the low-energy-consumption drying device comprises a barrel body, an inner cavity of the barrel body can form vacuum, and the barrel body is provided with a feeding hole and a discharging hole which are positioned at two ends; the spiral conveying shaft is arranged in the barrel body in a rotating manner along the axial direction of the barrel body; the driving device drives the screw conveyor to rotate; the heating device is positioned on the barrel body; and the vacuumizing device is connected with the inner cavity of the barrel body. The design of the scheme is exquisite, the barrel body is connected with the vacuumizing equipment, and a certain vacuum degree is kept in the barrel body during working, so that the boiling point of water in the barrel body can be reduced, water in the material can be evaporated by heating to a lower temperature during heating, and drying is realized; meanwhile, the vacuumizing device can accelerate the discharge of gas in the barrel body, and the increase of the air pressure in the cavity is avoided.

Description

Low-energy-consumption drying device and drying method thereof

Technical Field

The invention relates to drying equipment, in particular to a low-energy-consumption drying device and a drying method thereof.

Background

The kitchen waste refers to waste generated in daily life and food processing, food service, unit catering and other activities of residents, and comprises abandoned vegetable leaves, leftovers, fruit peels, egg shells, tea leaves, bones and the like, and the main sources of the kitchen waste are household kitchens, restaurants, dining halls, markets and other industries related to food processing.

The kitchen waste contains extremely high moisture and organic matters, is easy to rot and generates stink. After proper treatment and processing, the biomass can be converted into new resources, the characteristics of high organic matter content enable the biomass to be used as fertilizer and feed after strict treatment, methane can be generated to be used as fuel or power generation, and the grease part can be used for preparing biofuel.

When the kitchen waste is reused, the materials are generally crushed, and after solid, oil and water are separated, the solid organic matters are fermented and dried to be used as organic waste.

Therefore, various drying devices are needed to dry the solid organic matters, for example, the spiral low-energy-consumption drying device disclosed in application No. 201811598050.9 heats the materials in the cylinder 4 by arranging the heating shell and the spiral first flame guide plate, and conveys the materials by the spiral guide plate 5.

The problem with this configuration is that:

(1) in order to improve the heating efficiency, increased flame projecting device and flame guide plate and made the flame can be better heat the barrel, but its heating structure is complicated, be unfavorable for realizing, especially processing and installation accuracy between flame guide plate and the barrel require highly, this because in case the flame guide plate leads to flame guide plate and barrel to contact because of processing and installation accuracy are not high, then the barrel can constantly rub with the flame guide plate at the rotation in-process, very easily appear wearing and tearing and damaging.

(2) The flame inlet and the flame outlet are positioned at two ends of the flame guide plate, and heat is greatly lost when being transferred to the flame outlet in the flame guide plate, so that the temperature of different areas of the cylinder is uneven.

(3) In the heating process, the temperature in the cavity body must reach the evaporation temperature of liquid (water) of 100 ℃ to realize efficient drying, so the flame tube needs to be continuously heated, the energy consumption is high, and the cost is increased.

(4) The burner is used as a flame source, raw materials such as diesel oil, gasoline and the like need to be continuously consumed, the energy consumption is high, the use cost is high, and the environment friendliness is poor.

Disclosure of Invention

The present invention is directed to solve the above problems in the prior art, and an object of the present invention is to provide a low energy consumption drying apparatus and a drying method thereof, which can achieve fast drying only at a relatively low temperature by lowering the pressure and thus lowering the boiling point of water.

The purpose of the invention is realized by the following technical scheme:

a low energy consumption drying device comprises

The inner cavity of the barrel body can form vacuum and is provided with a feed inlet and a discharge outlet which are positioned at two ends;

the spiral conveying shaft is arranged in the barrel body in a rotating manner along the axial direction of the barrel body, extends from one end of the barrel body to the other end of the barrel body, and the edge of a spiral blade of the spiral conveying shaft is close to the inner wall of the barrel body;

the driving device drives the screw conveyor to rotate;

the heating device is positioned on the barrel body and used for heating the barrel body;

and the vacuumizing device is connected with the inner cavity of the barrel body.

Preferably, among the low energy consumption drying device, the feed inlet is two and every feed inlet department is provided with the motorised valve, the motorised valve passes through the outside transport jar of pipe connection, the top of outside transport jar is provided with first check valve.

Preferably, in the low-energy-consumption drying device, a first check valve is arranged at the feeding port.

Preferably, in the low-energy-consumption drying device, a spray head is arranged at a position, close to the feed inlet, in the barrel body, the spray head is connected with a pipeline extending out of the barrel body, and a second one-way valve is arranged on the pipeline.

Preferably, in the low-energy-consumption drying device, the discharge port is provided with a material receiving bin, and the bottom of the material receiving bin is provided with a weighing sensor.

Preferably, in the low-energy-consumption drying device, a bottom plate of the material receiving bin can be automatically opened and closed.

Preferably, in the low-energy-consumption drying device, the spiral blades of the spiral conveying shaft are provided with crushing rods.

Preferably, in the low energy consumption drying device, the driving device is a servo motor.

Preferably, in the low-energy-consumption drying device, the heating device includes a heating film wrapped on the outer circumferential wall of the barrel body.

Preferably, in the low energy drying apparatus, the heating film is divided into a plurality of zones, and the tub has a temperature sensor for measuring a temperature of each zone.

Preferably, in the low-energy-consumption drying device, heat-conducting silica gel or heat-conducting silicone grease is arranged between the heating film and the barrel body.

Preferably, in the low-energy-consumption drying device, the vacuumizing device is connected with the oil-water separator.

The drying method of the low-energy-consumption drying device comprises the following steps:

s1, providing the low-energy-consumption drying device;

s2, sealing the barrel body after the material is introduced into the barrel body;

s3, starting a vacuumizing device to enable the interior of the barrel body to reach a target vacuum degree;

s4, starting heating by the heating device;

and S5, the driving device starts to drive the spiral conveying shaft to drive the material to be stirred in the barrel body for a preset time.

Preferably, in the drying method of the low energy consumption drying apparatus, the step S3 includes the following steps:

s31, starting the vacuum extractor to make the barrel reach the target vacuum degree and then stopping the vacuum extractor;

s32, when the vacuum degree in the barrel body is reduced to a lower limit value, the vacuumizing device is started again to enable the barrel body to be vacuumized to a target vacuum degree and then is stopped;

s33, repeating the step S32.

Preferably, in the drying method of the low energy consumption drying apparatus, the target vacuum degree in the step S3 is between-98.5 KPa and-80 KPa (relative pressure).

Preferably, in the drying method of the low energy consumption drying device, the step S3 further includes introducing the fluid discharged from the vacuum extractor into an oil-water separator for oil-water separation.

Preferably, in the drying method of the low energy consumption drying apparatus, in the step S4, the temperature of each temperature partition is between 35 ℃ and 60 ℃.

Preferably, in the drying method of the low-energy-consumption drying device, in step S5, the driving device controls the residence time of the material in the first heating partition to meet the requirement that the temperature of the material is not lower than 35 ℃ to 60 ℃.

Preferably, in the drying method using the low energy consumption drying device, in step S5, the driving device controls the residence time of the materials in the tub to be between 1 and 72 hours.

Preferably, the drying method of the low energy consumption drying device further includes step S6, when or after the material enters the tub, the second one-way valve is opened, and the zymophyte is sprayed into the material.

Preferably, the drying method of the low-energy-consumption drying device further includes step S7, after the material is discharged out of the tub, the material is collected in the material receiving bin, when the weight of the material in the material receiving bin reaches a target value, the material is stopped being conveyed into the material receiving bin, and the bottom plate of the material receiving bin is opened for discharging.

The technical scheme of the invention has the advantages that:

1. the design of the scheme is exquisite, the barrel body is connected with the vacuumizing equipment, and a certain vacuum degree is kept in the barrel body during working, so that the boiling point of water in the barrel body can be reduced, water in the material can be evaporated by heating to a lower temperature during heating, and drying is realized; meanwhile, the vacuumizing device can accelerate the discharge of gas in the barrel body, and the increase of the air pressure in the cavity is avoided.

2. The spray head is arranged in the barrel body and provided with the one-way valve, so that zymogens can be effectively sprayed into the material through the spray head, fermentation of the material is realized, peculiar smell of the material is removed, nutrients of the material are increased, and subsequent transportation, storage and fertilizer efficiency improvement are facilitated; meanwhile, the one-way valve can fully realize online work, and the vacuum degree in the barrel body is ensured.

3. This scheme adopts the heating film as the heating source, and it is attached outside the wall body through heating resin, very big simplification the heating structure, do not have too high requirement to processing and installation accuracy, easily realize to the heating film heating efficiency is high, the homogeneity is good, do not have the overheated problem of district's portion, but automatic control temperature, the security is high, and longe-lived. The electric heating mode is lower in cost and better in environmental friendliness compared with the mode of burning combustible materials; and the heating film forms a plurality of heating subareas, and the temperature of each heating subarea can be controlled according to the requirement, so that the temperature is as close as possible when new and old materials are in contact, and the interference of temperature difference is reduced.

4. The discharge gate department sets up the storehouse that connects material of taking weighing device, can effectual realization online ration ejection of compact, easily quantitative packing to its online operation that can effectual assurance equipment reduces the destruction to the interior vacuum of staving.

5. The spiral conveying shaft is provided with the crushing rod, so that the materials can be stirred when being crushed, and therefore, all areas of the materials are heated more uniformly, and the drying efficiency is accelerated.

6. The vacuum extractor of this scheme is connected oil-water separator, can effectually separate the oil and the water of taking out to recycle respectively, can effectually realize the classification utilization efficiency of rubbish from cooking.

7. The vacuum degree selection of the scheme can realize evaporation of materials in the barrel body in a lower range, and energy consumption is effectively considered; meanwhile, the temperature selection is beneficial to the production of strains, and the effect of zymocyte can be fully exerted, thereby achieving the effect of quickly changing the performance of the solid organic matter.

8. The whole equipment can be combined with a feeding device and a zymogen liquid supply system, so that automatic and online processing is realized, the integration and the synergistic effect with other equipment are easy, and manual intervention is not needed.

9. The drying equipment of this scheme is fit for the occasion of various needs stoving applications, and the range of application is extensive, and the application mode is various, and the flexibility is good, convenient to popularize and use.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a front view of the inlet with electric valve of the present invention;

FIG. 4 is a schematic view of a nozzle and a fermented liquid supply line according to the present invention;

FIG. 5 is a cross-sectional view of a spiral vane band breaker bar of the present invention;

FIG. 6 is a schematic diagram of the structure of a multiple heating zone of the present invention;

FIG. 7 is a schematic view of the evacuation device of the present invention connected to an oil-water separator;

fig. 8 is a schematic view of a receiving bin area of the present invention;

FIG. 9 is an enlarged view of area A of FIG. 3;

fig. 10 is an enlarged view of the region B in fig. 8.

Detailed Description

Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. The embodiments are merely exemplary for applying the technical solutions of the present invention, and any technical solution formed by replacing or converting the equivalent thereof falls within the scope of the present invention claimed.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

The low energy consumption drying device disclosed by the invention is explained below with reference to the accompanying drawings, which can be used for drying various materials to be dried, and the following description will take solid organic matters obtained by crushing kitchen garbage as an example, as shown in fig. 1 and 2, including

A barrel body 1 in which a vacuum environment can be formed and which has a feed inlet 11 and a discharge outlet 12 at both ends;

the spiral conveying shaft 2 is arranged in the barrel body 1 in a rotating way along the axial direction of the barrel body 1, extends from one end to the other end of the barrel body 1, and the edge of a spiral blade of the spiral conveying shaft is close to the inner wall of the barrel body 1;

a driving device 3 for driving the screw conveyor 2 to rotate;

the heating device 4 is positioned on the barrel body 1 and used for heating the barrel body 1;

and the vacuumizing device 5 is connected with the inner cavity of the barrel body 1.

During operation, after the material enters the barrel body 1, the material is vacuumized and heated, and along with the reduction of the vacuum degree, the boiling point of the liquid is reduced, so that water molecules in the material can be evaporated at a lower temperature, and the drying with low energy consumption is realized.

Specifically, the barrel body 1 may be a barrel body with various shapes, such as a cylindrical shape, a square shape, etc., as shown in fig. 2, the barrel body 1 is preferably a cylindrical shape, and includes a cylinder 13 with two open ends and

end plates

14, 15 fixed to two ends of the cylinder 13, the

end plates

14, 15 are respectively connected to a bracket 18, the feed port 11 may be located on the end plate 14 at one end of the barrel body 1, or may be located on the wall of the cylinder 13, preferably on the wall of the cylinder 13.

As shown in fig. 2, an observation window 16 is provided in the cylindrical wall of the tub 1 to facilitate observation of the inside of the tub 1 at any time.

As shown in fig. 3, the two feed ports 11 are provided, and each feed port 11 is provided with an electric valve 30, so that the electric valves are adopted, when slurry is supplied on line, the slurry has high viscosity and the like, the opening force of a conventional electromagnetic valve is low, and the problem of unsmooth opening or incapability of opening exists, so that the opening smoothness and reliability are ensured by adopting the electric valves.

Simultaneously, the feed end of motorised valve passes through the outside transport tank 50 of pipe connection, the lateral part of the outside transport tank 50 is provided with feed inlet 501, and its bottom is provided with discharge gate 502, and its top is provided with the gas vent, gas vent department is provided with first check valve 60, feed inlet 501 connects the feeding equipment (not shown in the figure), discharge gate 502 passes through the pipe connection motorised valve. When the electric valve 30 is closed, the first check valve 60 can be opened to allow the air in the external transfer tank 50 to be discharged, so that the solid organic matters can enter the external transfer tank 50; when the electrically operated valve 30 at the opening of the barrel body 1 is opened, the first one-way valve is closed, so that the negative pressure in the barrel body 1 can suck the materials in the transfer tank 50 and the pipeline into the barrel body 1, and the feeding can be realized without extra power.

And, the conducting pressure of first check valve is greater than the negative pressure that evacuating device during operation made the staving 1 in form to thereby can effectually avoid the negative pressure in the staving 1 to lead to the first check valve to lead to destroying the vacuum in the staving 1 when the suction material. As shown in fig. 1, the discharge hole 12 is located on an end plate 15 at the other end of the barrel 1 or on a side wall of the cylinder 13, and is preferably disposed on the end plate 15 and located at a lower edge of the end plate 15, so that the axis of the conveying direction of the spiral conveying shaft 2 and the axis of the outlet direction can be effectively aligned to make the material in the barrel 1 easier to be extruded.

In addition, in other embodiments, a zymophyte is added to the material to eliminate odor in the material and to increase nutrients, so as to implement organic matter in the kitchen waste to be fertilized for recycling, as shown in fig. 2 and 4, a nozzle 6 is disposed in the barrel 1 at a position close to the feed port 11, the nozzle 6 is connected to a pipeline 7 extending out of the barrel 1, the pipeline 7 is provided with a pump 71 and connected to a zymophyte liquid supply source 8, the pipeline 7 is provided with a second one-way valve 72, which may be an overflow valve, a check valve, or the like, the second one-way valve 72 allows zymophyte liquid outside the barrel 1 to enter the barrel 1, and the conduction pressure thereof is greater than the negative pressure formed in the barrel 1 when the vacuum extractor works, so as to effectively avoid the second one-way valve from being opened due to the negative pressure adsorption in the barrel 1, destroy the vacuum degree of staving 1 to when not carrying out the fermented bacterial liquid and supplying, can effectually guarantee the leakproofness of staving, guarantee vacuum degree.

As shown in fig. 5, the spiral conveying shaft 2 is rotatably erected on two

end plates

14 and 15 of the barrel 1 through a bearing 20 and the like and is coaxial with the barrel 1, the edge of the spiral blade 21 of the spiral conveying shaft 2 keeps a slight gap with the inner wall of the barrel 1, and the gap can be as small as possible so as to ensure that the spiral blade 21 does not contact with the inner wall of the barrel 1 when rotating; and the spiral vane 21 extends from one end of the tub to the other end near the discharge hole 12.

As shown in fig. 5, one end of the screw shaft 2 extends to the outside of the end plate 14 of the tub 1 and is connected to the driving unit 3, and the driving unit 3 may be various possible motors, preferably a servo motor, so that the conveying distance of the screw shaft can be precisely controlled. In addition, in order to ensure the sealing performance of the barrel, the connection part of the spiral conveying shaft 2 and the driving device 3 is sealed and connected through a mechanical seal, a dynamic seal or a shaft seal (not shown in the figure) fixed on an end plate; of course, the motor may be connected to the screw delivery shaft by a magnetic coupling or the like, and the magnetic coupling is connected to the end plate 14 by a static seal (seal ring).

During operation, the driving device 3 drives the spiral conveying shaft 2 to rotate forwards or reversely, so that materials can be pushed to be conveyed forwards or backwards through the spiral blades 21, on one hand, the materials can be effectively turned over, and on the other hand, the retention time of the materials in the barrel body 1 can be effectively controlled.

Further, in the conveying process, because the materials are stacked together, when the materials are dried, the materials on the surface layer are more easily dried, and the materials inside the materials are not easily dried, so that in order to ensure the drying uniformity and reduce the energy consumption, as shown in fig. 5, a crushing rod 22 is arranged on the spiral blade 21 of the spiral conveying shaft 2, and the crushing rod 22 is positioned on two adjacent blade plates of the spiral blade 21, so that the materials can be crushed, the materials are thinner, the materials can be stirred and turned, the positions of the materials on the surface layer and the materials inside the material are switched, and the materials are uniformly heated and dried.

The heating device 4 may be any known device and equipment capable of heating the barrel body to form a high-temperature environment in the barrel or directly heating gas and substances in the barrel body, such as an electromagnetic induction heating device, a microwave heating device, a resistance heating device, and the like.

In a feasible embodiment, a coil is sleeved outside the periphery of the barrel body 1, alternating current is provided for the coil through a heating power supply, and the barrel body 1 is heated by electromagnetic induction heating; in another possible embodiment, heating devices such as resistance rods and/or resistance sheets can be arranged inside and outside the barrel body 1; in a preferred embodiment, as shown in fig. 6, the heating may be achieved by a heating film 41 wrapped on the outer circumferential wall of the barrel 1, and the heating film 41 may be a PTC electrothermal film, a graphite heating film, a graphene heating film, a far infrared electrothermal film, or the like.

The heating film 41 is adopted to realize heating, firstly, the heat conducting film is flexible, can be conveniently attached to the outside of the barrel body, and can solve the problem that a heating device arranged in the barrel body is spatially interfered with the spiral conveying shaft; secondly, the heating film 41 can effectively coat the whole barrel body, so that the heating coverage and uniformity are ensured; third, the heating film has good waterproof performance, long service life, controllable temperature and higher safety.

Further, in order to make the heat of heating film 41 evenly, fast transmit to on the staving 1, as shown in fig. 6, heating film 41 is fixed through heat conduction silica gel 42 the surface of staving 1, heat conduction silica gel 42 can provide viscidity for the attached of heating film 41 on the one hand to make things convenient for the subsides of heating film 41, its good heat conductivity simultaneously, thereby can make quick, the even conduction of heat of heating film 41 to staving 1. Of course, in other embodiments, the heat conductive silicone 42 may be replaced by heat conductive silicone grease.

In addition, in the drying process, the temperature of the materials in the barrel is already at a relatively high temperature, the temperature of the newly-entered materials is low, and the temperature difference between the newly-entered materials and the high temperature affects the evaporation and fermentation processes of the materials in the barrel, therefore, if a whole heating film is adopted to coat the circumferential wall of the whole barrel 1, the temperatures of different positions in the barrel are not adjustable, and in order to enable the newly-entered materials to reach similar temperatures when being mixed with the original materials in the barrel so as to reduce the influence of the temperature difference, the heating temperature of the area where the newly-entered materials are located can be higher than the temperatures of other areas, so that the cooled materials can be heated as soon as possible.

In view of this, as shown in fig. 6, the heating membrane 41 is formed by splicing a plurality of membrane bodies 411, for example, three membrane bodies 411 are provided, and the width of each membrane body 411 is the same, that is, the width of each membrane body 411 is 1/3 of the barrel length, each membrane body 411 encloses and forms a circle and covers 1/3 of the barrel wall of the barrel 1, and the barrel wall area of the barrel 1 covered by each membrane body 411 forms a temperature zone, so that the temperature of each temperature zone can be set as required, and at the same time, a temperature sensor (not shown in the figure) for measuring the temperature of each zone is provided on the barrel 1, and the temperature sensor can be arranged in the barrel or outside the barrel wall and selected as required.

As shown in fig. 2 and fig. 7, the vacuum pumping device 5 may be any known device with a pumping function, and is preferably a vacuum pump, the vacuum pump is connected to a pipe joint 17 arranged on the barrel body 1 through a pipeline, and a passage of the pipe joint 17 is communicated with an inner cavity of the barrel body 1. In addition, in the process of vacuumizing, the vacuum pump can discharge steam generated by evaporation in the barrel body 1 from the barrel body 1, and the steam contains oil, so that the discharge end of the vacuumizing device 5 is connected with the oil-water separator 40 through a pipeline, and the oil and the water can be separated to be respectively recycled.

Further, the dried materials are used as organic fertilizers, and need to be bagged according to a certain weight for convenient transportation, storage and carrying, and the existing equipment cannot realize online weighing, which is unfavorable for improving the packaging efficiency, so that, as shown in fig. 8, the discharge port 12 is provided with the receiving bin 9, and the bottom of the receiving bin 9 is provided with the weighing sensor 10.

In detail, as shown in fig. 8, the receiving bin 9 is fixed on the outer surface of the end plate 15 where the discharge hole 12 is located, and the surface of the receiving bin, which is connected with the end plate 15, is sealed by a sealing ring (not shown in the figure).

As shown in fig. 9 and 10, the receiving bin 9 may have various feasible shapes, for example, it may be a rectangular parallelepiped, and preferably it includes a triangular part 92, a rectangular cover 93 at the lower opening of the triangular part 92, and a bottom plate 91 at the lower notch of the rectangular cover 93, the bottom plate 91 includes a receiving plate 911 and a lower plate 912, four sides of the receiving plate 911 extend into the lower end wall surface of the rectangular cover 93, a limiting frame 913 is provided at the lower end of the rectangular cover 93 and surrounds the receiving plate 911, and a mounting groove for mounting the load cell 10 is formed on the lower plate 912, the height of the load cell 10 is greater than the depth of the mounting groove, the load cell 10 is connected to the receiving plate 911 above, the receiving plate 911 maintains a slight gap with the upper surface of the lower plate 912, so that the receiving plate 911 can float slightly to apply pressure to the load cell to realize weighing, the upper surface of the lower plate 911 and the lower surface of the flange 94 outside the sidewall of the rectangular cover 93 are sealed by a sealing ring 914 surrounding the material receiving plate 911, and the sealing ring 914 is further surrounding the limiting frame 913.

As shown in fig. 9 and 10, one side of the lower plate 912 is pivotally connected to a fixed connection seat 95, the connection seat 95 is fixed to the bracket 18, and a hole on the connection seat to the lower plate 912 is a kidney-shaped hole 951, a push-pull device 96 is disposed at the bottom of the lower plate 912 and drives the connection shaft to rotate with the connection seat 95, the push-pull device 96 may be an air cylinder, a hydraulic cylinder, or an electric push cylinder, one end of the push-pull device 96 is pivotally connected to a connection block 97 located at the bottom of the lower plate 912, a hole on the connection block 97 connected to the push-pull device 96 is a kidney-shaped hole 971, and the other end of the connection block is pivotally connected to a fixing seat 98.

Under normal conditions, the push-pull device 96 applies upward jacking force to the lower plate 912 to enable the sealing ring 914 on the lower plate to be attached to the flange 94 on the rectangular cover 93, so that the lower end opening of the rectangular cover 93 is effectively blocked; when the bottom plate 91 needs to be opened, the push-pull device 96 applies a downward pulling force to the bottom plate 91, so that the bottom plate can rotate around a connecting shaft of the bottom plate and the connecting seat 95 to be opened, and blanking can be performed.

Of course, in other embodiments, the load cell 10 may be an electronic scale, and the receiving bin 9 may be a trough body placed on the electronic scale, but this structure is not easy to perform automatic discharging compared to a structure in which the load cell is integrated on a bottom plate.

When the electric heating device works, the electric valve, the motor, the cylinder, the weighing sensor, the temperature sensor, the vacuum height measuring equipment, the power supply of the heating device, the electric parts such as the pump and the like are all connected to the control device, for example, a PLC control system, and the PLC control system controls the operation of each part according to the logic program compiled in the PLC control system and the set operation parameters.

The method for drying the kitchen waste crushed materials by using the low-energy-consumption drying device is specifically described as follows:

s1, providing the low-energy-consumption drying device of the embodiment;

s4, starting heating by the heating device;

In the step S2, the feed inlet of the low-energy-consumption drying device may be connected to the screw conveyor or the pipeline with a pump, and during feeding, the screw conveyor or the pump is started, and the electric valve is opened to introduce the crushed kitchen waste into the barrel 1, so that online feeding and continuous processing may be realized. When the screw conveyer or the pump does not work, the first one-way valve keeps a closed state, so that the sealing state in the barrel body is kept.

In step S3, the vacuum extractor can be kept in the vacuum state all the time, but the energy consumption of the vacuum extractor is correspondingly high, so in a preferred implementation mode, the vacuum extractor can be operated intermittently, specifically, the step S3 includes the following processes:

s31, the vacuum extractor (vacuum pump) is started to make the barrel 1 reach the target vacuum degree and then stopped, preferably when the relative pressure reaches the vacuum degree between-98.5 KPa and-80 KPa, for example.

And S32, when the vacuum degree in the barrel body is reduced to the lower limit value, the vacuumizing device is started again, namely the barrel body is vacuumized to the target vacuum degree and then stopped, and preferably, when the vacuum degree in the barrel body 1 is reduced to-20 KPa (relative pressure), the vacuumizing device is started.

S33, repeating the step S32.

Therefore, the energy consumption of the vacuum pumping device can be effectively reduced, and the vacuum degree in the barrel can be maintained at a relatively low boiling point temperature.

Meanwhile, in the step S3, the fluid discharged from the vacuum extractor is introduced into an oil-water separator for oil-water separation to obtain oil and wastewater, wherein the oil can be recycled; the waste water can be collected, treated and discharged.

In said step S4, the temperature of each temperature partition is between 35 ℃ and 60 ℃, preferably between 36 ℃ and 45 ℃; more preferably between 38 and 42 ℃, because the material can be boiled and evaporated in the above temperature range under the above vacuum condition, so as to be discharged out of the barrel body 1 along with the pumping of the vacuum device, and meanwhile, in this temperature range, the zymocyte can grow and react with the material more easily, so as to eliminate the peculiar smell in the material and increase the nutrient in the material.

Moreover, the temperature of the first heating subarea can be higher than that of the subsequent heating subarea, so that the temperature can be quickly raised to the temperature of the subsequent heating subarea, and the temperature of the newly introduced material is not lower than 35-60 ℃ before the newly introduced material contacts with the original material of the barrel body 1. Of course, it is also possible to bring the temperature to the above-mentioned temperature range by increasing the residence time of the material in the first heating zone.

In step S5, the driving device controls the retention time of the material in the barrel to be between 1 and 75 hours, preferably between 24 and 72 hours, and in the specific operation, the driving device drives the spiral conveying shaft to rotate forward for a certain distance and then turn over, so that the material can move forward and backward in the barrel, and thus the material can be moved forward and backward.

Further, in the drying process, the process of adding zymophyte into the material is also included, namely the step of S6 is also included, when or after the material enters the barrel body, a zymophyte supply pipeline is opened, zymophyte liquid is pumped into the spray head through equipment such as a pump, and zymophyte is sprayed on the material.

And finally, after the materials are fermented and/or dried in the barrel body, the materials are discharged from the discharge port 12 under the driving of the spiral conveying shaft, and at the moment, in order to conveniently bag or package quantitatively, the drying method further comprises the step S7, after the materials are discharged out of the barrel body, the materials are collected in the material receiving bin 9, the materials collected in the material receiving bin 9 exert pressure on the material connecting plate 911 to trigger a weighing sensor, the weighing sensor transmits data to a control device, when the weight reaches the target weight, the control device controls the spiral conveyor to stop extruding the materials out of the barrel body, meanwhile, the control device controls the push-pull device to start to open the bottom plate 91, and at the moment, the materials in the material receiving bin 9 fall into a packaging bag or a barrel under the action of gravity to realize quantitative packaging.

Of course, the above sequence numbers of S1-S7 are not the only limitations on the operation process of the equipment, such as heating and vacuum-pumping at the same time during actual use; or feeding, heating, vacuumizing and conveying by the spiral conveying shaft can be carried out simultaneously; or spraying the zymogen liquid before the materials enter the barrel body 1; in another embodiment, the fermentation tubes may be sprayed to the material inside the barrel, the material is stirred by the reciprocating rotation of the screw conveying shaft, and then the barrel is heated by the heating film to reach the proper growth temperature of the fermentation tubes without vacuum pumping.

The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.

Claims

1. Low energy consumption drying device, its characterized in that: comprises that

The barrel body (1) has an inner cavity capable of forming vacuum and is provided with a feed inlet (11) and a discharge outlet (12) which are positioned at two ends;

the spiral conveying shaft (2) is arranged in the barrel body (1) in a rotating manner along the axial direction of the barrel body (1);

a driving device (3) for driving the screw conveyor (2) to rotate;

the heating device (4) is positioned on the barrel body (1);

and the vacuumizing device (5) is connected with the inner cavity of the barrel body (1).

2. The low energy consumption drying apparatus according to claim 1, wherein: the feed inlet department sets up the motorised valve, the motorised valve passes through pipe connection outside transport jar (50), the top of outside transport jar (50) is provided with first check valve (60).

3. The low energy consumption drying apparatus according to claim 1, wherein: the position, close to the feed inlet, on the barrel body (1) is provided with a spray head (6), the spray head (6) is connected with an external pipeline (7), and a second one-way valve (8) is arranged on the external pipeline (7).

4. The low energy consumption drying apparatus according to claim 1, wherein: the discharge port (12) is provided with a material receiving bin (9), and the bottom of the material receiving bin (9) is provided with a weighing sensor (10).

5. The low energy consumption drying apparatus according to claim 4, wherein: the bottom plate (91) of the material receiving bin (9) can be automatically opened and closed.

6. The low energy consumption drying apparatus according to claim 1, wherein: the crushing rod (7) is arranged on the spiral blade (21) of the spiral conveying shaft (2).

7. The low energy consumption drying apparatus according to claim 1, wherein: the heating device (4) comprises a heating film (41) coated on the outer circumferential wall of the barrel body (1), and a heat conduction layer is arranged between the heating film and the barrel body (1).

8. The low energy consumption drying apparatus according to claim 7, wherein: the heating film (41) is divided into a plurality of subareas, and a temperature sensor for measuring the temperature of each subarea is arranged on the barrel body (1).

9. The low energy consumption drying apparatus according to any one of claims 1 to 8, wherein: the vacuumizing device (5) is connected with the oil-water separator (40).

10. The drying method of the low-energy-consumption drying device is characterized in that: the method comprises the following steps:

s1, providing the low energy consumption drying device of any one of claims 1-9;

s4, starting heating by the heating device;

and S5, the driving device starts to drive the spiral conveying shaft to drive the material to be stirred in the barrel body for a target time and then the material is discharged.

11. The drying method of a low energy consumption drying apparatus according to claim 10, wherein: the step S3 includes the following processes:

s31, starting the vacuumizing device to enable the interior of the barrel body to reach the target vacuum degree and then stopping the vacuumizing device;

s33, repeating the step S32.

12. The drying method of a low energy consumption drying apparatus according to claim 10, wherein: and S6, spraying the zymophyte into the material through the spray head while or after the material enters the barrel body.

13. The drying method of a low energy consumption drying apparatus according to claim 10, wherein: and S7, after the materials are discharged out of the barrel body, the materials are collected in the material receiving bin, when the weight of the materials in the material receiving bin reaches a target value, the materials are stopped being conveyed into the material receiving bin, and the bottom plate of the material receiving bin is opened for discharging.