KR102379811B1 - Oil extraction system for food waste precessing equipment - Google Patents

Abstract

The present invention relates to an oil extraction system for food waste processing equipment, which may extract vegetable oil created during a pretreatment process for food waste as much as possible to reduce a cost due to increase of sale of by-products and improve quality of final dry feed. The present invention provides an oil extraction system for food waste processing equipment which may improve economical profit due to increase of production of oil which is a by-product and improve quality of finally exhausted feed while maximizing extraction of oil in waste water regardless of seasons including winter, by implementing a new type oil extraction system which extracts oil in wastewater as much as possible by circulating and preheating the waste water created during a pretreatment process for food waste through a plurality of lines while sufficiently heating the waste water through a plurality of steps.

Description

Oil extraction system for food waste treatment facility

The present invention relates to an oil extraction system of a food waste treatment facility, and more particularly, it is possible to reduce costs by increasing the sales of by-products by maximally extracting the vegetable oil generated in the food waste pretreatment process, and in this regard, the final dry feed It relates to an oil extraction system of a food waste treatment facility that can also improve the quality of food waste.

In general, organic wastes such as food waste, industrial waste, and livestock waste, which are mainly generated at homes, restaurants, livestock farms, and food processing companies, account for most of the amount of organic waste generated in Korea, and a treatment plan for this is very urgent.

However, despite the enormous social cost caused by organic waste, the amount of organic waste generated continues to increase due to the improvement of living standards and industrial acceleration.

There are two types of organic waste treatment methods: incineration by burning waste and landfilling in a designated place. Recently, research on how to use organic waste as an energy source is being actively conducted. is the trend

As an example, a method of extracting oil from wastewater generated from organic waste such as food waste and using it as an alternative fuel has been attempted.

When food waste flows in, it is screened and crushed, then subjected to a solid-liquid separation process, and then the desorption filtrate separated from the dehydrated cake through the solid-liquid separation process to extract oil through a high-speed centrifugation process, and the extracted oil is subjected to a heating process. After removing the moisture through the sedimentation process, foreign substances are removed and then waste oil is finally produced.

In general, food waste is brought in in a state containing a lot of organic substances, but when the temperature of food waste is low, such as in winter, oil extraction is difficult due to gravity and coagulation during compression dehydration in the pretreatment process. Not only is there a difficulty in producing the oil of

In relation to this, if the food waste contains a lot of oil when drying the food waste in the post-treatment process, the food waste may adhere to the inside of the screw conveyor or each sorting device due to oil vapor, etc. or the screen net will be clogged. There are difficulties, and since the final discharged feed also contains a lot of oily components, there are frequent cases of complaints from consumers due to deterioration of feed quality, etc.

Laid-open Patent Publication No. 10-2008-0112996 Laid-open Patent Publication No. 10-2011-0133989 Laid-Open Patent Publication No. 10-2016-0139806 Laid-open Patent Publication No. 10-2019-0077170 Laid-open Patent Publication No. 10-2019-0115258

Therefore, the present invention has been devised in consideration of such a point, and it is a novel method for maximally extracting oil in wastewater by preheating while circulating the wastewater through several lines while sufficiently heating the wastewater generated during the pretreatment of food waste in several stages. By implementing the oil extraction system of An object of the present invention is to provide an oil extraction system for a food waste treatment facility.

In order to achieve the above object, the oil extraction system of the food waste treatment facility provided by the present invention has the following characteristics.

The oil extraction system of the food waste treatment facility includes a food waste storage hopper for storing food waste brought in from the outside, a shredder for crushing food waste discharged from the food waste storage hopper, and food waste discharged from the shredder. a dehydrator for dehydrating the water, a wastewater storage tank for storing wastewater discharged from the dehydrator, a low-speed separator for primary separation of wastewater discharged from the wastewater storage tank, and a secondary separation of wastewater discharged from the low-speed separator a three-phase separator, an oil storage tank for storing the oil discharged from the three-phase separator, an oil heating tank for heating the oil discharged from the oil storage tank, and a refined oil for storing the refined oil discharged from the oil heating tank Includes storage tank.

In particular, the oil extraction system of the food waste treatment facility includes a first heat exchange pipe installed inside a wastewater storage tank to exchange heat between wastewater and high-temperature circulating water, and a circulation supplying circulating water to the first heat exchange pipe. It is composed of a water tank and a condenser that allows the heated circulating water to be discharged to the circulating water tank after heat exchange between the circulating water discharged from the first heat exchange pipe and the steam provided from the boiler is made, and the wastewater storage tank is filled with It is characterized in that it further comprises a first heating device for heating the wastewater.

Here, a wastewater re-supply line is connected between the wastewater storage tank and the food waste storage hopper and/or the dehydrator so that the high-temperature wastewater provided from the wastewater storage tank is supplied to the food waste storage hopper and/or the dehydrator. It is desirable to be able to heat food waste with wastewater.

In the oil extraction system of such a food waste treatment facility, a second heat exchange pipe is installed inside the low-speed separator, and a third heat exchange pipe is installed inside the three-phase separator, so that heat exchange between the dehydration filtrate and three-phase treated water and high-temperature hot water is achieved. Consists of a hot water economizer for supplying hot water to the second heat exchange pipe and the third heat exchange pipe, and a boiler feed water tank that recovers hot water after heat exchange through the second heat exchange pipe and the third heat exchange pipe, It may further include a second heating device for heating the dehydration filtrate and three-phase treated water filled in the low-speed separator and the three-phase separator.

In addition, the first three-phase treated water re-supply line is connected between the three-phase treated water tank and the wastewater re-supply line connected to the food waste storage hopper or between the three-phase treated water tank and the wastewater re-supply line connected to the dehydrator, so that the three-phase separator It is desirable to heat the food waste with the high-temperature three-phase treated water by supplying the high-temperature three-phase treated water from the to the food waste storage hopper or the dehydrator.

In a preferred embodiment, the oil extraction system of the food waste treatment facility includes a condensed wastewater storage tank for storing condensed wastewater, a three-phase treated water heating tank for storing three-phase treated water discharged from the three-phase separator, and the three-phase treated water heating tank A fourth heat exchange pipe installed inside the to allow heat exchange between the high-temperature condensed water supplied from the condensed wastewater storage tank and the three-phase treated water, and a second three-phase treated water re-supply line connected between the three-phase treated water heating tank and the dehydrator A three-phase treated water reheating device comprising

The oil extraction system of the food waste treatment facility provided by the present invention has the following effects.

First, in the pretreatment process of food waste, wastewater is heated with various heat sources in various stages such as the wastewater storage step and wastewater separation step, and the heated wastewater is re-supplied in the pretreatment process through several lines to preheat the food waste, etc. By applying a new type of oil extraction system that extracts oil while the temperature of the wastewater is raised overall, it is possible to maximize the extraction of oil in the wastewater regardless of the season, such as winter, to secure high-quality oil and at the same time to secure high-quality oil and by-products. It has the effect of promoting economic benefits by increasing the production of phosphorus oil, and it is possible to increase the quality of the final discharged feed by sending the food waste in a state in which oil has been sufficiently removed to the post-treatment process and drying it. It has the effect of reducing the claim problem.

Second, food waste in a state in which oil has been removed as much as possible through the pre-treatment process is provided as a post-treatment process and dried, thereby eliminating problems such as food waste sticking to dryers, screw conveyors, and various sorting devices or getting caught in screen nets. Therefore, it is possible to efficiently operate and manage the post-treatment facility, and there is an effect of increasing the facility operation rate and at the same time increasing the feed production.

1 is a process diagram showing an oil extraction system of a food waste treatment facility according to an embodiment of the present invention;
2 is a process diagram showing an oil extraction system of a food waste treatment facility according to another embodiment of the present invention;
3 is a process diagram showing an oil extraction system of a food waste treatment facility according to another embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a process diagram illustrating an oil extraction system of a food waste treatment facility according to an embodiment of the present invention.

As shown in FIG. 1, the oil extraction system of the food waste treatment facility extracts oil while increasing the temperature of the wastewater when extracting oil from the wastewater generated during the food waste pretreatment process, thereby increasing the amount of oil extraction. , and also consists of a system that can secure high-quality feed by drying food waste containing less oil in the post-treatment process.

To this end, the oil extraction system of the food waste treatment facility is a means for separating contaminants such as vinyl and wastewater from food waste, and a food waste storage hopper 10, a crusher 11, a dehydrator 12, and a waste water storage tank 13 ), etc.

The food waste storage hopper 10 functions to store food waste brought in from the outside.

In the food waste storage hopper 10, moisture contained in the food waste, ie, wastewater, is naturally drained by gravity, and the drained wastewater is sent to the wastewater storage tank 13 through a line such as a pipe.

In addition, the food waste in the food waste storage hopper 10 , that is, the food waste from which moisture has been partially removed is sent to the crusher 11 by the screw conveyor.

In this case, the wastewater is naturally discharged even in the process of conveying the food waste along the screw conveyor.

The crusher 11 functions to finely crush food waste as well as contaminants such as vinyl mixed therein.

The contaminants discharged through the crusher 11 are sent to the contaminant collection point through the screw conveyor, and at the same time, the food waste discharged from the crusher 11 is sent to the dehydrator 12 through a line.

The dehydrator 12 functions to primarily remove moisture (wastewater) contained in the food waste.

The food waste discharged through the dehydrator 12 is sent to the dryer facility for the post-treatment process through the screw conveyor, and at the same time, the dehydration filtrate such as water discharged from the dehydrator 12, that is, the wastewater, is stored as wastewater through the line. It is sent to the tank (13).

The wastewater storage tank 13 functions to store wastewater discharged from the food waste storage hopper 10 and the dehydrator 12 .

The wastewater stored in the wastewater storage tank 13 is wastewater containing a lot of vegetable oil and the like, and the wastewater here is sent to the separator so that water and oil can be separated.

In addition, the oil extraction system of the food waste treatment facility is a means for extracting oil from wastewater, and includes a low-speed separator 14 , a three-phase separator 15 , an oil storage tank 16 , an oil heating tank 17 , and a refined oil storage tank (18), etc.

The low-speed separator 14 receives wastewater discharged from the wastewater storage tank 13 through a line, and has a function of first separating the supplied wastewater, for example, separating the dewatering filtrate containing oil from the wastewater. function to

The low-speed separator 14 is equipped with a dewatering filtrate tank 35 and a wastewater tank 36 , and the wastewater discharged from the wastewater storage tank 13 flows into the wastewater tank 36 , and After the wastewater is sent to the low-speed separator 14 through a pump and a line and separated, the dewatering filtrate at this time flows into the dewatering filtrate tank 35, and the dewatering filtrate in the dewatering filtrate tank 35 continues through a pump and a line. It is sent to the three-phase separator (15) side.

The three-phase separator 15 receives a dehydration filtrate containing wastewater, for example, oil, etc. discharged from the low-speed separator 14 side through a line, and a function of secondary separation of the dewatered filtrate thus supplied, for example, For example, it functions to separate oil from the dehydrated filtrate.

The three-phase separator 15 includes a three-phase treated water tank 31, wherein the three-phase treated water tank 31 at this time stores oil-removed three-phase treated water, and the three-phase treated water stored in this way is three-phase through a pump and a line. It is sent to a treated water storage tank (not shown).

The oil storage tank 16 functions to store the oil discharged through the line in the three-phase separator 15, that is, the oil separated from the dewatering filtrate.

The oil heating tank 17 is composed of a plurality of pieces, and functions to heat and purify the oil discharged through the line from the oil storage tank 16, and the refined oil storage tank 18 stores the refined oil. function to

To this end, a heating medium heater 37 is provided as a means for supplying a heat source for oil heating to the oil component heating tank 17, and the heating medium heater 37 at this time is set to about 125°C.

At this time, it is preferable to set each oil heating tank 17 to about 85°C.

In addition, a fifth heat exchange pipe 38 connected to a line extending from the heating medium heater 37 side is installed in each of the oil heating tank 17 and the refined oil storage tank 18 , and accordingly, the heating medium heater 37 ), a heating medium such as high-temperature water provided from the heat medium heater 37 and the fifth heat exchange pipe 38 circulates between the oil heating tank 17 and the refined oil storage tank 18 to heat the oil content. there will be

Here, the refined oil stored in the refined oil storage tank 18 is finally shipped to a consumer.

The food waste storage hopper 10, the crusher 11, the dehydrator 12, the wastewater storage tank 13, the low-speed separator 14 and the three-phase separator 15, the oil storage hopper 10 of the oil extraction system of the food waste treatment facility Facilities such as the tank 16, the oil heating tank 17, the refined oil storage tank 18, etc. can apply the equipment for performing the pretreatment process of a general food waste treatment facility as it is, and thus the detailed structure and operation method of these facilities A detailed description thereof will be omitted.

In particular, the oil extraction system of the food waste treatment facility includes the first heating device 22 as a means to increase the oil extraction amount by securing an appropriate temperature of the wastewater generated during the food waste pretreatment process.

The first heating device 22 includes a circulating water tank 20 for supplying circulating water to the first heat exchange pipe 19, and between the circulating water discharged from the first heat exchange pipe 19 and steam provided from the boiler. It is composed of a condenser 21, etc. that allows the heated circulating water to be discharged to the circulating water tank 20 after heat exchange is made, and by heating the waste water filled in the waste water storage tank 13, oil can be effectively extracted from the waste water plays a role in enabling it.

To this end, a first heat exchange pipe 19 is installed inside the wastewater storage tank 13 to allow heat exchange between wastewater and high-temperature circulating water, and the first heat exchange pipe 19 thus installed is a circulating water tank. 20 and the condenser 21 are connected to the circulation line.

In addition, the condenser 21 is connected to the boiler (not shown), the condensate tank 39 and the feed water tank 40 by a circulation line, and provides steam provided from the boiler, for example, high-temperature steam to the dryer facility. The surplus steam on the boiler side is supplied to the condenser 21, and the high-temperature steam supplied in this way exchanges heat with the circulating water in the condenser 21, and then returns to the condensate tank 39 and the water supply tank 40, The circulation process continues to be sent to the boiler side.

Here, the surplus steam supplied from the boiler flows along the tube inside the condenser, and the circulating water discharged from the wastewater storage tank 13 flows along the periphery of the tube inside the condenser, so that heat exchange between the surplus steam and the circulating water this will be done

Accordingly, the high-temperature circulating water supplied from the circulating water tank 20, for example, circulating water at about 65 to 70° C., is sent to the first heat exchange pipe 19 of the wastewater storage tank 13 and sent to the wastewater storage tank ( The wastewater filled in 13) is heated, and the circulating water that has been heated at this time, for example, circulating water at about 45 to 55°C passes through the condenser 21 and heats up again with excess steam at 65 to 70°C. It is sent to the circulating water tank 20 after recovering the temperature of the degree.

As this process is repeated, the wastewater filled in the wastewater storage tank 13 can maintain an appropriate temperature, and the wastewater is continuously sent to the separator while maintaining the temperature at this time. It is possible to extract as much oil as possible from wastewater heated to a certain temperature even under conditions or environments that may fall.

In addition, in the present invention, it is possible to increase the overall temperature of the food waste in the previous stage by using a part of the heated wastewater in the wastewater storage tank 13 (after all, the wastewater is discharged to the wastewater storage tank in the previous stage) It is possible to increase the temperature of the wastewater).

To this end, between the wastewater storage tank 13 and the food waste storage hopper 10, or between the wastewater storage tank 13 and the dehydrator 12, or between the wastewater storage tank 13 and the food waste storage hopper 10, and A wastewater re-supply line 23 is connected between the dehydrators 12 .

Accordingly, some of the high-temperature wastewater pumped from the wastewater storage tank 13 is supplied to the food waste storage hopper 10 or the dehydrator 12, or the food waste storage hopper 10 and the dehydrator 12, and is supplied in this way. The food waste stored in the food waste storage hopper 10 as well as the food waste that is dehydrated in the dehydrator 13 is heated by the high-temperature wastewater that is being used, so that the food waste can maintain a high temperature overall. As a result, the water discharge effect and the dehydration effect due to gravity can be increased, and the temperature of the wastewater discharged to the wastewater storage tank 13 can also be maintained high.

In addition, in the wastewater re-supply line 23, valves 41 are installed on the line directed to the food waste storage hopper 10 as well as the dehydrator 12 side, respectively, so that the food waste storage hopper 10 or The high-temperature wastewater supplied to the dehydrator 12 can be selectively intercepted.

In addition, the oil extraction system of the food waste treatment facility raises the overall temperature of the wastewater and the dehydrated filtrate when separating the wastewater in the low-speed separator 14 and the three-phase separator 15 to increase the oil extraction efficiency. A second heating device 22 is included as a means.

The second heating device 22 is installed inside the low-speed separator 14 and is installed inside the second heat exchange pipe 24 and the three-phase separator 15 for heat exchange between the dehydrated filtrate and high-temperature hot water. A third heat exchange pipe 25 for heat exchange between treated water and hot water at high temperature, a hot water economizer 26 for supplying hot water to the second heat exchange pipe 24 and the third heat exchange pipe 25; and a boiler feed water tank 27 that recovers heat-exchanged hot water through the second heat exchange pipe 24 and the third heat exchange pipe 25, etc., and is filled in the low-speed separator 14 and the three-phase separator 15 It can serve to heat the dehydration filtrate and three-phase treated water.

To this end, a second heat exchange pipe 24 is installed inside the wastewater tank 36 provided in the low-speed separator 14 to allow heat exchange between wastewater and high-temperature hot water, and is provided in the low-speed separator 14. A second heat exchange pipe 24 is installed in the dewatering filtrate tank 25 to allow heat exchange between the dewatering filtrate and high-temperature hot water, and the second heat exchange pipe 24 installed in this way is an economizer 26 for hot water supply. ) and the boiler feed water tank 27 and connected to the circulation line.

In addition, headers 42 are installed on the circulation line of the supply side and the circulation line of the recovery side, respectively, and the hot water supplied from the economizer 26 for hot water supply to the heat exchange pipe side is branched through the header 42 at this time. While being able to be supplied, the hot water discharged from each heat exchange pipe side is collected as one and can be recovered to the boiler feed water tank (27).

Accordingly, the high-temperature hot water supplied from the economizer 26 for hot water supply, for example, hot water of about 60 to 70° C., is sent to the second heat exchange pipe 24 and the third heat exchange pipe 25 to be three-phase treated water. The three-phase treated water, the dewatering filtrate, and the wastewater filled in the tank 31, the dewatering filtrate tank 35, and the wastewater tank 36 are heated, and the heated hot water at this time, for example, about 40 to 50 ° C. After being returned to the boiler feed water tank 31, after being heated in the boiler, the economizer 26 for hot water supply restores the temperature of about 60 to 70 ° C again, and then is sent to each heat exchange pipe side.

As this process is repeated, the wastewater, dewatering filtrate, and three-phase treated water filled in the wastewater tank 36, the dewatering filtrate tank 35 and the three-phase treated water tank 31 can maintain an appropriate temperature, and the wastewater continues to As the separation proceeds and the oil is extracted while maintaining the temperature of

In addition, in the present invention, it is possible to increase the overall temperature of the food waste in the previous stage by using a part of the heated three-phase treated water in the three-phase treated water tank 31 (after all, the wastewater storage tank in the previous stage) It is possible to increase the temperature of the wastewater discharged to the

To this end, between the three-phase treated water tank 31 and the wastewater re-supply line 23 connected to the food waste storage hopper 10, or a wastewater re-supply line connected to the three-phase treated water tank 31 and the dehydrator 12 side A first three-phase treated water re-supply line 29 is connected between (not shown).

Accordingly, a portion of the high-temperature three-phase treated water pumped from the three-phase treated water tank 31 is supplied to the food waste storage hopper 10 or the dehydrator 12, or the food waste storage hopper 10 and the dehydrator 12, The food waste stored in the food waste storage hopper 10 as well as the food waste dehydrated in the dehydrator 13 are heated by the high-temperature three-phase treated water supplied in this way, so that the food waste is maintained at a high temperature overall. As a result, the water discharge effect and the dehydration effect due to gravity can be increased, and the temperature of the wastewater discharged to the wastewater storage tank 13 can also be maintained high.

In addition, in the first three-phase treated water re-supply line 29, valves (not shown) are installed on the line toward the food waste storage hopper 10 as well as on the line toward the dehydrator 12, so that food waste is stored The high-temperature three-phase treated water supplied to the hopper 10 or the dehydrator 12 can be selectively interrupted.

In this way, the wastewater filled in the wastewater storage tank 13, the dewatering filtrate and wastewater filled in the low-speed separator side dewatering filtrate tank 35 and the wastewater tank 36, and the three-phase treated water tank 31 on the three-phase separator side are filled By heating the existing three-phase treated water with an appropriate heat source to raise the temperature, and by extracting the oil content in the wastewater while the temperature is raised in this way, the oil content extraction amount can be dramatically increased. By raising the overall temperature of the food waste that is undergoing the pretreatment process, it is possible to sufficiently secure the amount of oil extraction, especially in an environment such as winter when the temperature of the wastewater drops.

2 is a flowchart illustrating an oil extraction system of a food waste treatment facility according to another embodiment of the present invention.

As shown in FIG. 2 , here, the three-phase treated water stored in the three-phase treated water tank 31 is heated again, and the heated three-phase treated water is re-supplied to the front end of the dehydrator 12 as a means. A three-phase treated water reheating device 34 is shown.

The three-phase treated water reheating device 34 includes a condensed wastewater storage tank 30 for storing condensed wastewater, a three-phase treated water heating tank 44 for storing three-phase treated water supplied from the three-phase separator 15 side, and the three-phase treated water A fourth heat exchange pipe 32 installed inside the heating tank 44 to exchange heat between the high-temperature condensed water supplied from the condensed wastewater storage tank 30 and the three-phase treated water, the three-phase treated water heating tank 44 and and a second three-phase treated water re-supply line 33 and the like connected between the dehydrators 12 , and this three-phase treated water heating device 34 is a three-phase treatment of high temperature provided from the three-phase treated water heating tank 44 . Water is supplied to the dehydrator 12 to heat the food waste dehydrated in the dehydrator 12 .

To this end, a three-phase treated water supply line 43 is connected between the three-phase treated water tank 31 and the three-phase treated water heating tank 44 belonging to the three-phase separator 15, so that the three-phase treatment on the three-phase separator 15 side Water, that is, the three-phase treated water stored in the three-phase treated water tank 31 can be supplied to the three-phase treated water heating tank 44 .

A fourth heat exchange pipe 32 is installed inside the three-phase treated water heating tank 44 to exchange heat between the three-phase treated water and the high-temperature condensed water supplied from the condensed waste water storage tank 30 .

In addition, a second three-phase treated water re-supply line 33 extends from the three-phase treated water heating tank 44, and the extended second three-phase treated water re-supply line 33 is connected to the dehydrator 12 side, The high-temperature three-phase treated water supplied from the three-phase treated water heating tank 44 can be supplied to the dehydrator 12 .

Of course, although not shown, the second three-phase treated water re-supply line 33 at this time is also connected to the food waste storage hopper 10 so that the high-temperature three-phase treated water can be sprayed on the food waste in the food waste storage hopper 10 . do.

In particular, the three-phase treated water reheating device 34 is equipped with a condensed wastewater storage tank 30 as a means for providing a heat source for heat exchange between high-temperature condensed water and three-phase treated water, and the condensed wastewater storage tank 30 at this time Condensed wastewater that maintains a temperature of about 65 to 75° C. generated during the pre-treatment process of food waste and/or the post-treatment process of food waste can be supplied.

The condensed wastewater storage tank 30 and the fourth heat exchange pipe 32 are connected to the condensed water circulation line 42 so that the condensed water discharged from the condensed wastewater storage tank 30 is sent to the fourth heat exchange pipe 32 for heat exchange action. After performing, a circulation path returning to the condensed wastewater storage tank 30 can be made again.

Accordingly, the three-phase treated water in the condensed wastewater storage tank 30 is heated to a predetermined temperature through heat exchange with the fourth heat exchange pipe 32, and the high-temperature three-phase treated water continuously heated in this way is the second three-phase treated water The food waste in the dehydrator 12 can be heated by being supplied to the dehydrator 12 through the resupply line 33 , so that the dewatering performance of the dehydrator 12 can be improved and discharged to the wastewater storage tank 13 . It is also possible to keep the temperature of the wastewater used high.

3 is a flowchart illustrating an oil extraction system of a food waste treatment facility according to another embodiment of the present invention.

As shown in FIG. 3 , here, three-phase treated water is heated using late-night electricity, and the heated three-phase treated water is supplied to the food waste storage hopper 10 and the dehydrator 12. Heating three-phase treatment The water supply 45 is shown.

For example, a three-phase treated water storage tank 47 equipped with a sixth heat exchange pipe 46 for heat exchange as well as receiving and storing three-phase treated water, and a three-phase treated water storage tank 47 that stores water supply and receives late-night electricity to heat the water supply A three-phase treated water heating tank 49 having an electric coil 48 is provided, and a three-phase treated water circulation line 50 is connected between the three-phase treated water storage tank 47 and the sixth heat exchange pipe 46 .

Accordingly, the feed water in the three-phase treated water heating tank 49 is heated to a high temperature by the electric coil 48, and the feed water heated to such a high temperature is a three-phase treated water circulation line 50 and a sixth heat exchange pipe 46. , and eventually the three-phase treated water in the three-phase treated water storage tank 47 can be heated to a predetermined temperature by the heat exchange action with the sixth heat exchange pipe 46 .

In addition, a third three-phase treated water re-supply line 51 extends from the three-phase treated water storage tank 47, and the extended third three-phase treated water re-supply line 51 is connected to the food waste storage hopper 10 side. and the dehydrator 12 , the high-temperature three-phase treated water supplied from the three-phase treated water storage tank 47 can be supplied to the food waste storage hopper 10 and the dehydrator 12 .

Accordingly, the three-phase treated water in the three-phase treated water storage tank 47 is heated to a predetermined temperature through heat exchange with the sixth heat exchange pipe 46 , and the heated three-phase treated water continuously becomes the third three-phase treated water The food waste is supplied to the food waste storage hopper 10 and the dehydrator 12 through the resupply line 51 so that the food waste in the food waste storage hopper 10 and the dehydrator 12 can be heated. It is possible to maintain a high temperature state, and consequently, the effect of discharging water by gravity and the effect of dehydration can be increased, and at the same time, the temperature of the wastewater discharged to the wastewater storage tank 13 can also be maintained high.

As described above, in the present invention, the wastewater generated in the pretreatment process of food waste is sufficiently heated over several stages to extract oil, and the heated wastewater is supplied to various stages of the pretreatment process to preheat the food waste. By providing a new oil extraction method, it is possible to maximize the extraction of oil in wastewater regardless of the season, such as winter, and achieve economic benefits by increasing the production of oil, which is a by-product, and, As it dries in the post-treatment process, the quality of the final discharged feed can be improved.

10: food waste storage hopper 11: crusher
12: dehydrator 13: waste water storage tank
14: low-speed separator 15: three-phase separator
16: oil storage tank 17: oil heating tank
18: refined oil storage tank 19: first heat exchange pipe
20: circulating water tank 21: condenser
22: first heating device 23: waste water re-supply line
24: second heat exchange pipe 25: third heat exchange pipe
26: economizer for hot water supply 27: boiler feed water tank
28: second heating device 29: first three-phase treated water re-supply line
30: condensed wastewater storage tank 31: three-phase treated water tank
32: fourth heat exchange pipe 33: second three-phase treated water re-supply line
34: three-phase treated water reheating device 35: dewatering filtrate tank
36: waste water tank 37: heating medium heater
38: fifth heat exchange pipe 39: condensate tank
40: water tank 41: valve
42: condensate circulation line 43: three-phase treated water supply line
44: three-phase treated water heating tank 45: heated three-phase treated water supply device
46: 6th heat exchange pipe 47: three-phase treated water storage tank
48: electric coil 49: three-phase treated water heating tank
50: three-phase treated water circulation line 51: third three-phase treated water re-supply line

Claims (5)

a food waste storage hopper 10 for storing food waste brought in from the outside;
a crusher 11 for crushing the food waste discharged from the food waste storage hopper;
a dehydrator 12 for dehydrating the food waste discharged from the crusher 11;
a waste water storage tank 13 for storing waste water discharged from the dehydrator 12;
a low-speed separator (14) for primary separation of wastewater discharged from the wastewater storage tank (13);
a three-phase separator 15 for secondary separation of wastewater discharged from the low-speed separator 14;
an oil storage tank 16 for storing the oil discharged from the three-phase separator 15;
an oil heating tank 17 for heating the oil discharged from the oil storage tank 16;
a refined oil storage tank 18 for storing the refined oil discharged from the oil heating tank 17;
A first heat exchange pipe 19 installed inside the wastewater storage tank 13 to allow heat exchange between wastewater and high-temperature circulating water, and a circulating water tank supplying circulating water to the first heat exchange pipe 19 . (20) and the condenser 21 for allowing the heated circulating water to be discharged to the circulating water tank 20 after heat exchange between the circulating water discharged from the first heat exchange pipe 19 and the steam provided from the boiler is made Consists of, a first heating device 22 for heating the wastewater filled in the wastewater storage tank (13);
Oil extraction system of a food waste treatment facility, characterized in that it comprises a.
The method according to claim 1,
A wastewater re-supply line 23 is connected between the wastewater storage tank 13 and the food waste storage hopper 10 and/or the dehydrator 12, and the high-temperature wastewater supplied from the wastewater storage tank 13 is food waste. An oil extraction system for a food waste treatment facility, characterized in that it is supplied to the storage hopper (10) and/or the dehydrator (12) to heat the food waste.
The method according to claim 1,
A second heat exchange pipe 24 is installed inside the low-speed separator 14, and a third heat exchange pipe 25 is installed inside the three-phase separator 15, so that the dehydration filtrate and three-phase treated water and high-temperature hot water to allow heat exchange between
A hot water economizer 26 for supplying hot water to the second heat exchange pipe 24 and the third heat exchange pipe 25, and heat exchange through the second heat exchange pipe 24 and the third heat exchange pipe 25 Consisting of a boiler feedwater tank 27 for recovering hot water after completion of the heat treatment, and further comprising a second heating device 28 for heating the dehydration filtrate and three-phase treated water filled in the low-speed separator 14 and the three-phase separator 15 Oil extraction system of food waste treatment facility, characterized in that.
4. The method according to claim 1 or 3,
Between the three-phase treated water tank 31 and the wastewater re-supply line 23 connected to the food waste storage hopper 10 or between the three-phase treated water tank 31 and the wastewater re-supply line connected to the dehydrator 12 side, the first It becomes the three-phase treated water re-supply line 29, and the high-temperature three-phase treated water provided from the three-phase separator 15 is supplied to the food waste storage hopper 10 or the dehydrator 12 to heat the food waste. Oil extraction system of food waste treatment facility.
The method according to claim 1,
A condensed wastewater storage tank 30 for storing condensed wastewater, a three-phase treated water heating tank 44 for storing three-phase treated water supplied from the three-phase separator 15 side, and the three-phase treated water heating tank 44 inside Connected between the fourth heat exchange pipe 32 installed to allow heat exchange between the high-temperature condensed water supplied from the condensed wastewater storage tank 30 and the three-phase treated water, and the three-phase treated water heating tank 44 and the dehydrator 12 It consists of a second three-phase treated water re-supply line 33, and the three-phase treated water at high temperature provided from the three-phase treated water heating tank 44 is supplied to the dehydrator 12 to reheat the three-phase treated water capable of heating food waste. The oil extraction system of the food waste treatment facility, characterized in that it further comprises a device (34).

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