Deep-frying and drying device based on mechanically pressurized oil heat exchange steam re-condensation process

Abstract

This invention discloses a frying and drying device based on a mechanically pressurized oil heat exchange and steam recondensation process. The device includes a frying chamber connected via a pipe to a mechanically pressurized steam heat exchanger, which is connected via a pipe to the inlet of an oil-water separator. The oil outlet of the oil-water separator is connected via a pipe to the frying chamber. This invention proposes a mechanically pressurized steam heat exchange and recondensation process, using a liquid ring compressor to compress steam and the heat medium (oil) together. The steam and heat medium (oil) directly exchange heat, causing the steam to condense. The hot oil is separated by the oil-water separator and returned to the frying chamber, while the separated condensate is discharged through a drain outlet. This invention is more energy-efficient than traditional food frying and drying equipment; it has lower heat exchange losses and higher heat transfer efficiency than traditional MVR equipment, requiring less mechanical energy input and no external heat source, with an energy efficiency ratio generally exceeding 6. When used for drying wet waste, this invention requires no external heat source compared to traditional wet waste drying equipment, making it more energy-efficient and eliminating the risk of combustion or explosion.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of frying and drying machines, and particularly relates to a frying and drying device based on a mechanical pressurization oil heat exchange steam recondensation process. BACKGROUND

[0002] Frying and drying is widely used in the food industry, and the contact area between the frying and drying heat medium and the dried material is large, and the heat exchange efficiency is high compared with the wall type heat exchanger, but an external heat source is needed, and the energy consumption is high. The MVR mechanical pressurization recondensation technology has low heat consumption, but the traditional MVR technology adopts a wall type heat exchanger, the heat exchange temperature difference is large, the irreversible loss is large, the energy consumption of the traditional wet waste drying equipment is high, and the dried material forms fine dust which has a risk of combustion and explosion. SUMMARY

[0003] In view of the above problems existing in the prior art, the application provides a frying and drying device based on a mechanical pressurization oil heat exchange steam recondensation process, which overcomes the defect of high drying heat consumption of the traditional drying equipment.

[0004] To solve the above technical problems, the technical scheme of the application is as follows:

[0005] The frying and drying device based on a mechanical pressurization oil heat exchange steam recondensation process comprises a frying chamber, the frying chamber is connected with a steam mechanical pressurization heat exchange device through a pipeline, the steam mechanical pressurization heat exchange device is connected with an oil-water separator inlet through a pipeline, and the oil outlet of the oil-water separator is connected with the frying chamber through a pipeline.

[0006] The steam mechanical pressurization heat exchange device is a liquid ring compressor, and the liquid ring compressor comprises an end cover, a liquid inlet, a steam inlet and an oil-gas mixture outlet, the liquid inlet and the steam inlet are connected with the frying chamber through an oil extraction pipe and an air extraction pipe respectively, and the oil flow rate of the liquid inlet meets the requirement that the oil temperature rise after the compressed steam is condensed and heat exchanged is not more than 20 DEG C.

[0007] The oil-water separator is provided with an oil outlet and a water outlet, and a throttle valve is arranged on the connecting pipeline between the oil outlet of the oil-water separator and the frying chamber.

[0008] The device is suitable for food frying and drying and wet waste material frying and drying.

[0009] One end of the frying chamber is connected with an extrusion feeding section, and the other end is connected with a pressing discharging section, the size of the feeding end of the extrusion feeding section is larger than that of the discharging end, an extrusion screw and a feeding screw are arranged in the extrusion feeding section, the discharging end is in a hole shape, a pushing screw is arranged in the frying chamber, and a discharging hole is arranged at the end of the pressing discharging section.

[0010] The inlet of the extrusion feeding section is connected with a shredder.

[0011] The present application provides a steam mechanical supercharging oil heat exchange recondensation process, which uses a mixed compression supercharger (liquid ring compressor) to compress steam and heat medium (oil) together, directly exchanges heat between the steam and the heat medium (oil), condenses the steam, separates the hot oil from the water separator back to the oil frying chamber, and discharges the condensed water separated out through a drain port. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Figure 1 is a structural schematic diagram of the liquid ring compressor of the present application.

[0013] Figure 2 Figure 2 is a schematic diagram of the internal structure of the liquid ring compressor of the present application.

[0014] Figure 3 Figure 3 is a schematic diagram of the application applied to the food frying and drying plane structure.

[0015] Figure 4 Figure 4 is a schematic diagram of the application applied to the food frying and drying structure.

[0016] Figure 5 Figure 5 is a schematic diagram of the application applied to the wet garbage frying and drying plane structure.

[0017] Figure 6 Figure 6 is a schematic diagram of the application applied to the wet garbage frying and drying structure.

[0018] Figure 7 Figure 7 is a schematic diagram of the application applied to the wet garbage frying and drying structure. Figure 5 Figure 8 is a sectional view of A-A.

[0019] Figure 1: 1 - frying chamber, 101 - frying chamber door, 102 - push screw, 2 - liquid ring compressor, 21 - base, 22 - end cover, 23 - liquid inlet, 24 - steam inlet, 25 - oil and gas mixture outlet, 26 - shell, 27 - eccentric impeller, 3 - oil-water separator, 31 - water outlet, 32 - oil return pipe, 33 - oil-water mixture pipe, 4 - oil extraction pipe, 5 - air extraction pipe, 6 - motor reducer, 7 - extrusion feeding section, 71 - feeding screw, 72 - extrusion screw, 8 - extrusion discharging section, 9 - shredder, 10 - discharging hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative labor fall within the protection scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0021] The frying and drying device based on the mechanical supercharging oil heat exchange steam re-coagulation process comprises a frying chamber 1, the frying chamber 1 is connected with a steam mechanical supercharging heat exchange device through pipelines (an oil extraction pipe 4 and an air extraction pipe 5), the steam mechanical supercharging heat exchange device is connected with an oil-water separator 3 inlet through a pipeline (an oil-water mixture pipe 33), and an oil outlet of the oil-water separator 3 is connected with the frying chamber 1 through a pipeline (an oil return pipe 32).

[0022] The steam mechanical supercharging heat exchange device is a liquid ring compressor 2, as shown in Figure 1 、 Figure 2 The liquid ring compressor comprises a base 21, an end cover 22, an outer shell 26 and a cylinder, the cylinder has an eccentric impeller 27, the end cover is provided with a liquid inlet 23, a steam inlet 24 and an oil-gas mixture outlet 25, the liquid inlet 23 and the steam inlet 24 are connected with the frying chamber 1 through the oil extraction pipe 4 and the air extraction pipe 5 respectively, the liquid ring liquid in the liquid ring compressor is heat medium oil, and the oil inlet flow of the liquid inlet 23 satisfies that the oil temperature rise after steam condensation and heat exchange is not more than 20 DEG C.

[0023] The principle of the liquid ring compressor is that the impeller is eccentrically arranged in the cylinder and a certain amount of oil is introduced into the cylinder, the impeller (rotor) rotates and reaches a certain rotating speed, the oil is thrown out due to the centrifugal force, and a liquid ring is formed on the inner surface of the cylinder. A crescent cavity is formed between the impeller surface and the liquid ring, and it is a plurality of small chambers (elementary volumes) with different volumes. The volume of each small chamber periodically expands and shrinks with the rotation of the impeller. The liquid inlet and the steam inlet are correspondingly arranged on the end covers on both sides of the cylinder, so that the suction compression, oil heat exchange and oil-gas mixture discharge can be realized in each elementary volume during one rotation of the impeller.

[0024] The liquid ring liquid in the liquid ring compressor adopts heat medium oil, the inlet of the cooling liquid of the traditional liquid ring compressor is used as the heat medium oil inlet, meanwhile, the liquid inlet 23 (oil inlet) is much larger than that of the conventional liquid ring compressor, the oil inlet flow of the liquid inlet 23 satisfies that the oil temperature rise after steam condensation and heat exchange is not more than 20 DEG C, and the purpose is to use a large amount of heat medium oil to carry the latent heat released by steam condensation, reduce the heat exchange temperature difference and reduce the input mechanical work.

[0025] The liquid ring compressor in the application works at high temperature (higher than the condensation point of steam), the liquid ring compressor is not provided with a cooling liquid outlet, the heat medium oil and the pressurized steam are discharged from the oil-gas mixture outlet 25, condensed in the oil-water mixture pipe 33, and changed into oil-water mixture to enter the oil-water separator 3.

[0026] The oil-water separator 3 is provided with an oil outlet and a water outlet 31, a throttle valve is arranged on the oil return pipe 32 between the oil outlet of the oil-water separator 3 and the frying chamber 1. The waste water separated by the oil-water separator is discharged from the water outlet 31, and the separated hot oil is depressurized by the throttle valve and returned to the frying chamber 1.

[0027] The heat circulation of the device is: frying and drying (water evaporation absorbs sensible heat of the heat medium oil, and the oil temperature is reduced) - steam pressurization and condensation (mixed compression with the heat medium oil, latent heat released by steam condensation, and the temperature of the heat medium oil is increased) - oil-water separation - the heat medium oil returns to the frying chamber, and the separated water is discharged after being cooled.

[0028] The frying and drying device based on the mechanical pressurization oil heat exchange steam recondensation process disclosed in the application is suitable for food frying and drying and wet garbage material frying and drying.

[0029] As shown in Figure 3 , Figure 4 , the frying and drying device based on the mechanical pressurization oil heat exchange steam recondensation process is used for food frying and drying, and includes a frying chamber 1, the frying chamber 1 is connected with a liquid ring compressor 2 through an oil suction pipe 4 and an air suction pipe 5, the liquid ring compressor 2 is connected with an oil-water separator 3 inlet through an oil-water mixture pipe 33, an oil outlet of the oil-water separator is connected with the frying chamber 1 through an oil return pipe 32, a throttle valve is arranged on the oil return pipe, the separated hot oil is depressurized by the throttle valve and returned to the frying chamber 1 for recycling, and the separated water is discharged through a water outlet 31.

[0030] The liquid ring compressor includes a base 21, an end cover 22, an outer shell 26 and a cylinder, the cylinder is provided with an eccentric impeller 27, the end cover is provided with a liquid inlet 23, a steam inlet 24 and an oil-gas mixture outlet 25, the liquid inlet 23 and the steam inlet 24 are connected with the frying chamber 1 through the oil suction pipe 4 and the air suction pipe 5 respectively, the liquid ring liquid in the liquid ring compressor is heat medium oil, and the oil inlet flow of the liquid inlet 23 meets that the oil temperature rise after steam condensation heat exchange is not more than 20 DEG C.

[0031] The liquid ring liquid in the liquid ring compressor is heat medium oil, the inlet of the cooling liquid of the traditional liquid ring compressor is used as the heat medium oil inlet, meanwhile, the liquid inlet 23 (oil inlet) is much larger than that of the conventional liquid ring compressor, the oil inlet flow of the liquid inlet 23 meets that the oil temperature rise after steam condensation heat exchange is not more than 20 DEG C, and the purpose is to use a large amount of heat medium oil to carry the latent heat released by steam condensation, reduce the heat exchange temperature difference and reduce the input mechanical work.

[0032] Working process: The food materials to be dried are placed in the frying basket of the frying chamber (not shown in the figure), the frying chamber door 101 is closed, and the liquid ring compressor motor is started. The pressure in the frying chamber 1 gradually decreases, and the food materials and frying oil exchange heat fully, the moisture evaporates, and the water vapor enters the liquid ring compressor 2 through the suction pipe 5 and the frying oil through the oil suction pipe 4. The steam is pressurized in the liquid ring compressor 2, and heat exchange and condensation occur in the liquid ring compressor and pipeline, forming an oil-water mixture with an increased temperature. It enters the oil-water separator 3, the separated water is cooled and discharged, and the separated hot oil is returned to the frying chamber 1 for recycling. The dried food can be centrifuged in the frying chamber to remove oil, and then the machine is stopped. The frying chamber door 101 is opened and the dried food is taken out. When drying food, the frying chamber is preferably under negative pressure to reduce nutrient loss.

[0033] like Figure 5 , Figure 6 and Figure 7 As shown, a deep-frying and drying device based on mechanical pressurized oil heat exchange steam recondensation process is used for the treatment of wet waste or sludge. It includes a shredder 9 and a frying chamber 1. The front end of the frying chamber 1 is connected to an extrusion feeding section 7, and the rear end is connected to a pressing discharge section 8. Wet waste or sludge enters the shredder 9 and is crushed into small particles, and then enters the extrusion feeding section 7. The feed end of the extrusion feeding section 7 is larger than the discharge end. The extrusion feeding section 7 is equipped with a feed screw 71 and an extrusion screw 72. The discharge end is orifice-shaped, so that the waste or sludge is squeezed out into fine cylindrical material and enters the frying chamber 1. The frying chamber 1 is equipped with a push screw 102. The end of the pressing discharge section is equipped with a discharge hole 10. The push screw 102, the feed screw 71, and the extrusion screw 72 are coaxially driven by a motor reducer 6. The frying chamber 1 is connected to the liquid ring compressor 2 through the oil extraction pipe 4 and the air extraction pipe 5. The liquid ring compressor 2 is connected to the inlet of the oil-water separator 3 through the oil-water mixture pipe 33. The oil outlet of the oil-water separator is connected to the frying chamber 1 through the return oil pipe 32. A throttle valve is installed on the return oil pipe. The separated hot oil is depressurized by the throttle valve and returned to the frying chamber 1 for recycling. The separated water is discharged through the water outlet 31.

[0034] The liquid ring compressor includes a base 21, an end cover 22, a housing 26, and a cylinder. The cylinder contains an eccentric impeller 27. The end cover is provided with a liquid inlet 23, a steam inlet 24, and an oil-gas mixture outlet 25. The liquid inlet 23 and the steam inlet 24 are connected to the frying chamber 1 through an oil extraction pipe 4 and a gas extraction pipe 5, respectively. The liquid ring liquid in the liquid ring compressor is a heat transfer oil. The oil inlet flow rate of the liquid inlet 23 is sufficient to ensure that the oil temperature rise after the compressed steam condenses and exchanges heat does not exceed 20°C.

[0035] The liquid ring liquid in the liquid ring compressor is heat transfer oil. The inlet of the coolant in the traditional liquid ring compressor is used as the inlet of the heat transfer oil. At the same time, the liquid inlet 23 (oil inlet) is much larger than that of the conventional liquid ring compressor. The oil inlet flow rate of the liquid inlet 23 is sufficient to ensure that the oil temperature rise after the compressed steam condenses and exchanges heat does not exceed 20°C. The purpose is to use a large amount of heat transfer oil to carry the latent heat released by the steam condensation, reduce the heat exchange temperature difference, and reduce the input mechanical work.

[0036] The process of drying wet waste is as follows: raw materials are shredded, extruded and fed, fried and dried, and then pressed and discharged.

[0037] Wet waste enters the shredder 9 and is crushed into small particles. Then it enters the extrusion feeding section 7, where the screw channel gradually narrows. At the discharge end of the extrusion feeding section, it is divided into fine cylindrical shapes and enters the frying chamber 1. The discharge end of the extrusion feeding section 7 also serves as a feed seal. The fine cylindrical material comes into full contact with the frying oil in the frying chamber 1, exchanges heat, evaporates moisture, and gradually dries. Driven by the push screw 102, it moves towards the pressing discharge section 8 while drying. In the pressing discharge section 8, the oil in the material is squeezed out and returns to the frying chamber 1. The solid material is squeezed out through the discharge hole 10. The dry material in the discharge hole is compressed and compacted, which acts as a seal to prevent air leakage. The dry material in the discharge hole 10 has a high calorific value and can be used as fuel.

[0038] This device can be used for the drying of wet waste containing organic matter, such as kitchen waste, sewage sludge, and livestock manure. When used for sludge drying, positive pressure is preferentially used in the frying chamber to increase the frying temperature, accelerate dehydration, and decompose some organic matter. When used for kitchen waste drying, negative pressure is preferentially used to convert solid products into feed and increase their value.

[0039] This invention proposes a steam-mechanical pressurized oil heat exchange and recondensation process. A liquid ring compressor is used to co-compress steam and the heat medium (oil), allowing direct heat exchange between them. The steam condenses, and the hot oil is separated by an oil-water separator and returned to the frying chamber. The separated condensate is discharged through a drain outlet. This invention is more energy-efficient than traditional food frying and drying equipment; it has lower heat exchange losses and higher heat transfer efficiency than traditional MVR equipment, requiring less mechanical energy input and no external heat source, with an energy efficiency ratio generally exceeding 6. When used for drying wet waste, this invention requires no external heat source compared to traditional wet waste drying equipment, making it more energy-efficient and eliminating the risk of combustion or explosion.

Claims

1. A frying drying apparatus based on the process of mechanical supercharged oil heat exchange steam recondensation, comprising a frying chamber, characterized in that: The frying chamber is connected with the steam mechanical supercharging heat exchange device through an oil suction pipe and an air suction pipe, the steam mechanical supercharging heat exchange device is connected with the oil-water separator inlet through an oil-water mixture pipe, and the oil outlet of the oil-water separator is connected with the frying chamber through an oil return pipe; The steam mechanical supercharging heat exchange device is a liquid ring compressor, the liquid ring compressor comprises an end cover, a liquid inlet, a steam inlet and an oil-gas mixture outlet, the liquid inlet and the steam inlet are connected with the frying chamber through the oil suction pipe and the air suction pipe respectively, and the oil inlet flow of the liquid inlet satisfies that the oil temperature rise after the compressed steam is condensed and heat exchanged is not more than 20 DEG C.

2. The oil-fried drying device based on the mechanical supercharged oil heat-exchange steam re-coagulation process according to claim 1, characterized in that: The oil-water separator is provided with an oil outlet and a water outlet, and a throttle valve is arranged on the connecting pipeline between the oil outlet of the oil-water separator and the frying chamber.

3. The apparatus according to claim 1, wherein the apparatus is characterized by: The device is suitable for food frying and drying, and wet garbage material frying and drying.

4. The apparatus according to claim 3, wherein the apparatus is characterized in that: One end of the frying chamber is connected with an extrusion feeding section, and the other end is connected with a pressing discharging section, the feeding end size of the extrusion feeding section is larger than the discharging end size, an extrusion screw and a feeding screw are arranged in the extrusion feeding section, the discharging end is in a hole shape, a pushing screw is arranged in the frying chamber, and a discharging hole is arranged at the end of the pressing discharging section.

5. The apparatus according to claim 4, wherein the apparatus is characterized in that: The inlet of the extrusion feeding section is connected with a shredder.

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