KR200401313Y1 - Foodwaste slurry dryer - Google Patents

Abstract

The present invention relates to a food slurry drying apparatus configured to dry a food slurry using a heat of vaporization and a calorific value of a refrigeration cycle, and includes a dryer for storing and drying a food slurry. The food slurry is dried by a flow of dry air circulated back through the heat exchanger after being dried in a wet state after drying, wherein the heat exchanger includes a precooler for precooling the dry air through heat exchange with a heat medium; An evaporator configured to dehumidify the dry air passing through the precooler while being cooled by the heat of evaporation of a refrigerant; And a condenser for heating the dry air dehumidified while passing through the evaporator by heating, wherein the refrigerant is vaporized while passing through the evaporator, and configured to generate heat through the condenser after passing through a compressor. With this configuration, the food slurry can be dried at a very low cost by using vaporization heat and calorific value of the freezer while maintaining the stability of the freezing cycle. Drying efficiency is very high even at temperature.

Description

Food slurry drying equipment {FOODWASTE SLURRY DRYER}

The present invention relates to a food slurry drying apparatus, and more particularly, to a food slurry drying apparatus configured to dry the food slurry using the heat of vaporization and the calorific value of the freezing cycle.

In general, food slurries generated in homes, restaurants, food processing plants or sewage treatment plants contain a large amount of water.

The water-containing slurry not only has a large weight by the moisture contained therein, but also decays with time, causing environmental pollution such as severe odor. In addition, when incinerated, dioxin, which is an environmentally harmful substance, is generated, which causes soil contamination during landfill, and its treatment is very difficult.

In order to solve this problem, the food slurry is heated in a heating furnace equipped with a heater therein to evaporate the water contained in the food slurry, and then, using a separate freezing cycle, air containing the water evaporated from the food slurry is used. A food slurry drying apparatus of a method of cooling and liquefying and discharging moisture is disclosed in the related art.

However, this food slurry drying apparatus has a disadvantage in that a large cost is consumed during drying.

In addition, since the tripping, which is a phenomenon in which the refrigeration cycle is stopped due to overheating, does not ensure the reliability of the device, it may be possible to configure a small facility, but it may not be used as a large facility.

The present invention has been made to solve the above problems, an object thereof is to provide a food slurry drying apparatus that can dry the food slurry by using the heat of vaporization and calorific value of the freezing cycle while maintaining the stability of the freezing cycle.

In order to achieve the above object, the present invention includes a dryer in which food slurry is stored and dried, and dried into the dryer to discharge the food slurry in a wet state, and then discharged in a wet state, and then circulated back through the heat exchanger to the inside of the dryer. The food slurry is configured to be dried by the flow of air, and the heat exchanger includes a precooler configured to precool the dry air through heat exchange with a heat medium; An evaporator configured to dehumidify the dry air passing through the precooler while being cooled by the heat of evaporation of a refrigerant; And a condenser for heating the dry air dehumidified while passing through the evaporator by heating, wherein the refrigerant is vaporized while passing through the evaporator, and after passing through a compressor, a food slurry drying device configured to generate heat through the condenser. to provide.

Further, according to the present invention, the precooler includes a cooling tower for cooling the heat medium and a circulation pump for conveying the heat medium, wherein the heat medium is circulated between the cooling tower and the precooler by the pumping pressure of the circulation pump. It is preferable to be configured to pre-cool the dry air flowing into the group.

According to the present invention, the precooler includes a precooling circulation passage in which a heat medium inside circulates between a cooling tower and a preheating circulation path in which the heat medium circulates between a preheater in which a heat medium therein is heated. It is preferably configured to be selectable from the precooling circuit or the preheating circuit according to the temperature.

In addition, according to the present invention, the heat exchanger is a corrugated passage in which a plurality of bending plates bent in a zigzag form stacked between the evaporation furnace and the condenser are spaced apart from each other to form a waveform flow of dry air between the bending plates It is preferable to form

In addition, according to the present invention, a plurality of the dryer is provided, the food slurry is dried while sequentially moving the plurality of dryers, the drying air is preferably flow in the direction opposite to the moving direction of the food slurry, more preferably Preferably, the dryer is provided with three, and classified into primary, secondary, and tertiary dryers.

In addition, according to the present invention, a pipe in which the refrigerant is introduced into the condenser is further provided with a gas injector capable of injecting a low-temperature refrigerant gas.

By the construction of the present invention, it is possible to dry the food slurry at a very low cost by using the vaporization heat and the calorific value of the freezer while maintaining the stability of the freezing cycle, and after removing the moisture in the air to heat the drying air to enter the drying chamber Therefore, drying efficiency is very high even at low temperature. In addition, the present invention is equipped with a pre-cooling, a pre-cooler can efficiently achieve the drying inside the dryer regardless of the external temperature change can be dried at any time of the season regardless of the air conditions in the air.

Hereinafter, with reference to the drawings will be described in detail a preferred embodiment of the present invention.

1 is a block diagram of a food slurry drying apparatus according to the present invention, Figure 2 is a view showing a circulation cycle of the refrigerant of the food slurry drying apparatus shown in FIG.

Referring to the drawings, the food slurry drying apparatus according to the present invention includes a dryer 10 is accommodated in the food slurry dried. Preferably, a plurality of dryers are provided, and the food slurry brought into the primary dryer 14 through the inlet 11 is dried while moving in the order of the secondary dryer 18 and the tertiary dryer 22. It is discharged to the outside through the outlet 21 of the tertiary dryer.

According to the present invention, the dryer is formed in a rotary kiln type, and transfer conveyor devices 24 and 26 for transferring food slurry are provided between the dryers.

The food slurry dried in the primary dryer 14 for a predetermined time is discharged through the outlet 12 of the primary dryer 14 and then transferred through the transfer conveyor 24 and then introduced into the secondary dryer 18. In this case, the food slurry secondary dried in the secondary dryer 18 is brought into the tertiary dryer 22 in the same process, and the food slurry dried in the tertiary dryer 22 is discharged in a state where drying is completed. do. By this operation, the food slurry is dried while continuously moving from the first dryer 14 to the second dryer 18 to the third dryer 22, so that the food slurry can be dried in a continuous process. do.

At this time, the drying air flowing in the dryer, that is, the drying air flows through the heat exchanger after being introduced from the outside, and then flows in the order of the tertiary dryer 22-> secondary dryer 18-> primary dryer 14. After passing through the heat exchanger 30 again, it flows back into the tertiary dryer 22 and circulates.

The heat exchanger 30 is responsible for heating and dehumidifying the drying air circulating in the dryer, and the heat exchanger includes a precooler 32, an evaporator 36, a water catcher 40, and a condenser 44. .

Meanwhile, the refrigerant forms a refrigerating cycle for allowing the drying air to be heated and dehumidified in the heat exchanger 30 while flowing through the evaporator 36, the compressor 38, and the condenser 44.

The evaporator 36 of the refrigeration cycle is a device that cools the air passing through the surroundings by using the vaporization heat of the refrigerant. The refrigerant absorbs heat from the surroundings and evaporates, and the air flowing around the evaporator 36 absorbs the evaporator 36. It cools by the amount of heat absorbed by. At this time, the moisture contained in the surrounding air is liquefied and discharged into the water as the temperature decreases.

The condenser 44 of the refrigeration cycle is a device that heats the high-temperature, high-pressure gas refrigerant discharged from the compressor 38 with surrounding air to release heat of the refrigerant to condense the liquid. The surrounding air is heated as it passes through the condenser 44, and the refrigerant is cooled and then flows back toward the evaporator.

The present invention utilizes the heat of vaporization and the calorific value of the refrigeration cycle as described above. The drying air is taken from the food slurry inside the dryer 10 while the dry air passing through the condenser 44 is heated, and dried, and included in the dry air. The dehydrated water is dehumidified while passing through the evaporator 36, and then heated again to circulate to the dryer.

At this time, the dry air cooled while passing through the evaporator 36 passes through the water catcher 40. A plurality of bent plates 41 bent in a zigzag form are spaced apart from each other in the water catcher 40 so that It forms a corrugated passage with a bend in the flow direction.

Moisture in the dry air cooled while passing through the evaporator 36 is liquefied and collected downward by gravity, but even in the droplet state, fine water particles may pass through the evaporator 36 in a state of being suspended in the dry air. The dry air including such fine water particles passes in a zigzag direction along the corrugated path 42 between the bent plates 41 formed in the water catcher 40.

The fine water particles in the dry air passing through the corrugated passages not only condense on the surface of the bending plate 41 while contacting the bending plate 41, but also collide with each other by agglomeration of water particles, and grow in size by aggregation. It falls by and collects in the lower part.

By this configuration of the water catcher 40, almost all moisture in the dry air liquefied due to the temperature drop is removed, and the dry air is heated again while passing through the condenser 44 with the moisture removed.

However, if the circulation continues, heat is accumulated in the dryer 10 due to the heat generated by the condenser, and thus the temperature inside the dryer 10 continuously increases, and the temperature of the refrigerant rises, causing the refrigeration cycle to trip. There is a fear of stopping.

According to the present invention, however, the stability of the refrigeration cycle is ensured by allowing the dry air to pass through the precooler 32 before the evaporator 36. The precooler 32 is connected to the cooling tower 50 by a pipe, and is configured such that dry air is precooled while the internal water (heat medium) is circulated by the driving of the circulation pump 52.

On the other hand, according to the present invention, the precooler 32 is separated from the preheater 54 and the precooler 32 in a separate circulation passage from the precooling circulation passage circulated between the cooling tower 50. It is provided with the preheating circulation path b which circulates. Accordingly, the water of the precooler 32 is precooled circulation passage (a), that is, the precooler 32-> circulating pump 52-> cooling tower 50-> precooler 32 or preheating circulation (b), that is, It is configured to selectively circulate to the precooler 32-> circulation pump 52-> preheater 54-> precooler 32. In this case, the precooler 32 may be more preferably referred to as a precooler or a preheater, but for convenience of description, the precooler 32 is referred to as a precooler 32.

To this end, a first direction switching valve 56 is installed in a pipe through which water passed through the circulation pump 52 circulates, and a second direction switching valve 58 is installed in a pipe into which water is introduced into the precooler 32. do. The water is circulated between the precooler 32-> circulating pump 56-> cooling tower 50 by the flow control of the first directional valve 56 and the second directional valve 58 or the precooler ( 32)-> Circulation pump 56-> preheater 54 is optionally circulated. In the present embodiment, the cooling tower 50 is composed of a water tower, but is composed of a plurality of heat sinks and may be designed in such a manner as to exchange heat with the atmosphere.

In winter, food slurries processed in the food slurry drying apparatus are often brought into a frozen state. When the frozen food slurry is introduced into the dryer 10, the coil of the evaporator 36 freezes due to the sublimation heat, and when the temperature of the dry air is too low, the evaporator may be lower than the evaporation temperature of the refrigerant. In 36), dehumidification is not possible, so only unnecessary power is wasted.

According to the present invention, in this case, the dry air is preheated by the water circulating between the precooler 32-> circulating pump 52-> preheater 54, and the food brought into the dryer 10. Allow the slurry to thaw by dry air. In this case, by installing the temperature sensor 62 in the circulation path of the dry air, the refrigeration cycle operates when the temperature of the dry air flowing into the heat exchanger is higher than the evaporation temperature of the refrigerant, thereby preventing unnecessary waste of power.

Looking at the refrigeration cycle of the present invention, the refrigerant of the refrigeration cycle is made to dehumidify the dry air by the heat of vaporization of the evaporator 36 while circulating the evaporator (36)-> compressor (38)-> condenser (44), the condenser The exotherm at 44 causes the dry air to be heated.

Preferably, the present invention installs a gas injector 39 in the pipe flowing into the compressor 38. The gas injector 39 functions to maintain a constant temperature of the refrigerant by injecting a low temperature refrigerant when the refrigerant circulating the freezing cycle is formed at a high temperature above a safe temperature. The low temperature injected from the gas injector 39 Refrigerant of the portion of the refrigerant passing through the condenser 44 to move through the branch pipe is formed to be cooled. Cooling at this time is configured to be made by the water circulating between the cooling tower 50 (not shown).

In addition, in order to prevent the compressor 32 from tripping due to overheating, it is preferable to install the pressure sensor 41 and to automatically stop the operation of the compressor 38 when the pressure in the refrigerating cycle is set above the set value. Do. If the pressure is set below the set point, the compressor 38 is automatically restarted.

The present invention is provided with a control unit (not shown) so that the operation of each component described above can be automatically made by setting.

Looking at the operation of the food slurry drying apparatus according to the present invention.

According to the present invention, the food slurry is dried while moving in the order of the primary dryer 14-> secondary dryer 18-> tertiary dryer 22. At this time, since the food slurry of the secondary dryer 18 is first dried in the primary dryer 14 and heated by dry air, the temperature of the food slurry is higher than that of the food slurry in the primary dryer 14. In the same manner, the food slurry of the tertiary dryer 22 is dried while passing through the primary dryer 14 and the secondary dryer 28, and has a higher temperature than the food slurry of the secondary dryer 18.

The flow of the dry air is formed in the opposite direction to the movement path of the food slurry, in which the air introduced to the outside is dehumidified through the precooler 32 and the evaporator 36 (summer basis), and in the water catcher 40 After the condensation is removed, the water is heated while passing through the condenser 44 to be formed as dry air and introduced into the tertiary dryer 22. The dry air supplied into the tertiary dryer 22 heats the food slurry in the tertiary dryer 22 in the state where the temperature is the highest by the heat generated by the condenser 44 and heats it to dry. . Dry air is introduced into the secondary dryer 18 in a state where the temperature is lowered through heat exchange in the tertiary dryer 22, and the food slurry in the secondary dryer 18 is the tertiary dryer 22. Since the temperature is lower than the food slurry inside, the temperature of the drying air in the tertiary dryer 22 is higher than the food slurry in the secondary dryer 18 even though the temperature of the drying air is lowered. Therefore, the drying air introduced into the secondary dryer 18 is dried while heating the food slurry in the secondary dryer 18 again, and the temperature decreases through heat exchange. The air inside the secondary dryer 18 flows again and flows into the primary dryer 14, and in the same principle, the food slurry in the primary dryer 14 is lower than the food slurry in the secondary dryer 18. Since the temperature is low, even if the temperature of the drying air decreases during heat exchange in the secondary dryer 18, the temperature is higher than the food slurry in the primary dryer 14. Therefore, the drying air introduced into the primary dryer 14 heats and dries the food slurry inside the primary dryer 14 again, and the air whose temperature is lowered through heat exchange causes the heat exchanger 30 to circulate. do.

The dry air heated by the condenser 44 by the circulation of the dry air can dry the food slurry by utilizing the heat of the dry air to the maximum, and the dry air passes through the primary dryer 14 to Since the lowest is formed, it is possible to minimize the heat transfer area of the precooler (32).

That is, when dry air flows in the order of the primary dryer 14-> secondary dryer 18-> tertiary dryer 22, the dry air is higher than the temperature of the food slurry in the tertiary dryer 22. In order to be set, the temperature of the drying air flowing into the primary dryer 14 must be increased in consideration of heat loss in the primary dryer 14 and the secondary dryer 18, and the tertiary dryer 22 Since the temperature of the food slurry inside is the highest state, the heat transfer area and capacity of the precooler 32 must be increased for the dehumidification effect and the tripping prevention of the freezing cycle. However, the present invention, as described above, forms the flow of dry air as opposed to the movement path of the food slurry, so as to achieve the optimization of such a facility.

In addition, the present invention allows the food slurry to be dried while moving the three dryers (14, 18, 22) sequentially to maintain a constant temperature of the drying air. And it is possible to prevent the temperature of the inside of the dryer 10 to rise above a certain temperature, preferably to maintain a relatively low temperature of the temperature of the drying air inside the dryer does not exceed 60 degrees. This is because when the drying air is overheated, the food slurry adheres to the inner wall of the dryer 10. According to the present invention, it is possible to prevent the food slurry by drying the food slurry at a relatively low temperature. Accordingly, after finishing the drying process, there is an advantage that the inside of the dryer 10 can be simply washed with water.

In the case of using a single dryer, as the food slurry in the dryer dries, the temperature inside the dryer gradually increases. In the latter part of the drying process, the temperature of the drying air flowing into the heat exchanger becomes very high. Thus, when dry air is formed at high temperature, there exists a high possibility that a freezing cycle may stop by a trip. However, according to the present invention, the drying air of the latter part of the drying process, that is, the drying air drying the food slurry in the tertiary dryer 22 is recycled to the drying air of the first half of the drying air (first dryer) while heating the low temperature food slurry. By cooling, it is possible to lower the temperature of the dry air flowing into the evaporator even if the freezing cycle cycle is repeated. Of course, according to the present invention, the drying air is introduced into the evaporator through the precooler 32, so that it is possible to form a single dryer. Thus, the food slurry is formed in the primary dryer 14-> secondary dryer 18-> 3. While sequentially transported to the secondary dryer 22, the stepwise drying step is performed by the drying air circulated in the order of the tertiary dryer 22-> secondary dryer 18-> primary dryer 14. The efficiency can be maximized.

Therefore, according to the present invention, it is preferable that a plurality of dryers 10 are provided, and more preferably, three or more dryers.

Dry air is introduced from the outside to circulate in the order of the heat exchanger (30)-> tertiary dryer (22)-> secondary dryer (18)-> primary dryer (14), the heat exchanger (30) The precooler 32, the evaporator 36, the water catcher 40, and the condenser 44 are comprised.

Meanwhile, in winter, the precooler 32 defrosts the food slurry brought into the dryer by heating the air introduced from the outside by water circulating the preheater 54, and then performs a drying process. The preheating operation of the precooler 32 is set to be performed when the temperature of the drying air passing through the dryer 10 is lower than the evaporation temperature of the refrigerant.

On the other hand, when the temperature of the drying air passing through the dryer 10 is formed above a predetermined temperature, the precooler 32 precools the drying air to increase the dehumidification efficiency in the evaporator and to allow the freezing cycle to be stably operated without tripping. do.

According to the food slurry drying apparatus according to the present invention, the drying air introduced from the outside for drying the food slurry circulates through the dryer 10 and the heat exchanger 30 and is not discharged to the outside. The food slurry generates odors during drying, which contaminates the surrounding atmosphere when dry air is discharged to the outside. According to the present invention, it is possible to maintain a constant temperature inside the dryer without discharging the temperature of the drying air to the outside, thereby preventing such air pollution. However, it is to be discharged through the scrubber 60 provided to remove the odor for the case that needs to discharge the dry air to the outside, such as the completion of the drying process.

On the other hand, when the food slurry drying apparatus according to the present invention is used for the purpose of drying agricultural products, the smell may not be a problem depending on the type of the dry matter. In this case, a part of the drying air passing through the dryer 10 to the atmosphere may be discharged to the atmosphere (c), and a heat exchanger may introduce fresh air from the outside (d) to remove moisture, heat it, and then supply it to the dryer. have. In this case, it will be possible to keep the drying air inside the dryer at a constant temperature while minimizing the amount of heat of the precooler 10.

Although the present invention described above has been described in detail with reference to specific preferred embodiments, various modifications may be made by those skilled in the art to which the present invention belongs without departing from the spirit or scope of the present invention. . The appended claims are intended to cover such various modifications as well as the above-described embodiments.

According to the food slurry processing apparatus of the present invention, the food slurry can be dried at a very low cost by using the heat of vaporization and the calorific value of the refrigerator while maintaining the stability of the freezing cycle. In addition, the drying efficiency is very high even at low temperatures because the drying air is heated and then introduced into the drying chamber after removing the moisture in the air.

In addition, the present invention is equipped with a pre-cooling, a pre-cooler can efficiently achieve the drying inside the dryer regardless of the external temperature change can be dried at any time of the season regardless of the air conditions in the air.

In addition, according to the present invention, the food slurry inside the dryer is dried at a relatively low temperature by the drying air, thereby preventing the phenomenon of sticking to the inside of the dryer, thereby facilitating a cleaning process after the drying treatment.

In addition, according to the present invention, it is possible to dry the food slurry while circulating in the state that the air inside the dryer is not discharged to the outside to prevent environmental pollution, and to install a large capacity equipment by treating the food slurry in a continuous drying process Can be.

1 is a block diagram of a food slurry drying apparatus according to the present invention.

2 is a view for explaining a cycle of the refrigerant of the food slurry drying apparatus shown in FIG.

* Explanation of symbols for the main parts of the drawings

10: dryer 14: primary dryer

18: secondary dryer 22: tertiary dryer

30: heat exchanger 31: gas injector

32: precooler 36: evaporator

38: compressor 40: water catcher

41: bending plate 42: corrugation path

50: cooling tower 52: circulation pump

54: preheater 60: screwer

Claims (7)

The food slurry is provided with a dryer for storing and drying the food slurry, and the food slurry is dried by a flow of dry air circulated back through the heat exchanger into the dryer after the food slurry is dried and discharged in a wet state. To ensure that The heat exchanger is a precooler for precooling the dry air through heat exchange with the heat medium; An evaporator configured to dehumidify the dry air passing through the precooler while being cooled by the heat of evaporation of a refrigerant; And a condenser for heating the dry air dehumidified while passing through the evaporator by exothermic heat, The refrigerant is evaporated while passing through the evaporator, food slurry drying apparatus, characterized in that configured to generate heat while passing through the condenser after passing through a compressor. The method of claim 1, The precooler is provided with a cooling tower for cooling the heat medium and a circulation pump for conveying the heat medium, wherein the heat medium is circulated between the cooling tower and the precooler by the pumping pressure of the circulating pump and is introduced into the heat exchanger. Food slurry drying apparatus, characterized in that configured to pre-cool. The method according to claim 1 or 2, The precooler includes a precooling circulation path in which a heat medium circulates between a cooling tower and a preheating circulation path in which the heat medium circulates between a preheater in which a heat medium is heated, and the heat medium is formed according to the temperature of the dry air. Food slurry drying apparatus, characterized in that configured to flow in the circulation circuit selected from the pre-cooling circuit or pre-heating circuit. The method of claim 1, The heat exchanger is characterized in that a plurality of bending plates bent in a zigzag form stacked between the evaporation furnace and the condenser in a spaced apart state to form a corrugated passage for forming a waveform flow of dry air between the bending plates. Food slurry drying apparatus. The method of claim 1, Wherein the dryer is provided with a plurality, the food slurry is dried while moving the plurality of dryer sequentially, food slurry drying apparatus, characterized in that the drying air flows in the direction opposite to the moving direction of the food slurry. The method of claim 5, The dryer is provided with three, food slurry drying apparatus, characterized in that divided into primary, secondary, tertiary dryer. The method of claim 1, Food piping slurry drying apparatus further comprises a gas injector for injecting a coolant gas at a low temperature in the pipe into which the refrigerant flows into the condenser.