KR100767809B1 - Leftover Food Recycling Process - Google Patents

Abstract

According to the present invention, the remaining food is put into the storage tank and then the food waste discharged while being quantitatively discharged to the crusher food crushing step; A food drying step of transporting and crushing the food to a crushing storage tank and then quantitatively discharging the discharged food to a dryer for drying; Odor removal and wastewater purification, in which malodorous vapor generated during food drying is collected, the malodorous gas is transported to the combustion furnace and burned off, and the vapor is condensed and transported and purified to the wastewater treatment plant; A sorting step of transporting and feeding the dried food into a dry storage tank and then quantitatively discharging the discharged food to a sorter to separate the feed and the junk from each other; The selected feed is a feed shipment step of packaging and shipping in the feed facility; The remaining ash is discharged to the outside as the contaminants separated from the sorter are put into the combustion furnace and combusted, and the generated combustion gas becomes a steam production heat source of the waste heat boiler, and the produced steam is recycled to a heat source of the dryer for recycling and waste heat recycling; And combustion gas discharged after being used as a heat source of the waste heat boiler, after the exhaust gas is collected, the combustion gas purifying and releasing step of removing harmful substances and excess dust and releasing the final purified air to the atmosphere is provided. do.

Leftover food, recycling, drying, deodorization, wastewater treatment, sorting, combustion

Description

Process for resourcing food waste

1 is a flow chart of the remaining food resource recycling process according to an embodiment of the present invention,

2 is a flowchart of a facility in which the process of FIG. 1 is performed;

3 is a schematic diagram of a facility in which the process of FIG. 1 is performed.

<Explanation of symbols for main parts of the drawings>

S10 ... food shredding S20 ... food drying

S30 Remove odor and purify waste water S31 Remove dust

S32 ... Initial odor removal S33 ... Separation of malodorous gas and condensate

S34 ... Removing excess odor and purifying waste water S40 ... Selection

S50 ... feed shipment S60 ... recycle and waste heat recycling

S70 ... Combustion gas purification and release S71 ... Combustion gas temperature reduction

S72 ... removal of harmful substances S73 ... removal of dust

S74 ... atmospheric release

The present invention relates to a leftover food resource recycling process, and more particularly, to a leftover food resource recycling process for refining food waste, that is, leftover food and recycling it as a resource.

In general, leftover foods contain a large amount of organic matter, salt and water, causing bacteria to grow or decay, and cause odors. These leftovers are gradually generated in large quantities according to population growth, national income increase, and economic development. It's happening.

As a way to treat the remaining food in large quantities, such as landfill, ocean dumping, incineration, etc. may be employed, but according to the above method, not only soil pollution caused by leachate but also water pollution such as groundwater, marine pollution, In addition to causing environmental problems such as air pollution due to incineration, there is a problem that promotes the destruction of land and marine ecosystems.

On the other hand, in the case of the incineration method, there is a problem that the efficiency of installation and the running cost are excessively consumed in reducing food and processing time.

As an alternative to the above environmental problems, the remaining foods can be directly processed and fed into the resource by hand or mechanically beneficial for animal growth, but the environmental pollution caused by waste water and odorous substances generated during processing There is still a problem that occurs.

The present invention was created in order to solve the above-mentioned problems, and the remaining food is not only resourceized and recycled as feed, but also saves maintenance costs, and provides a remaining food resource recycling process that reduces the environmental pollution problem due to wastewater and odors. Its purpose is to.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

Remaining food feed process of the present invention for achieving the above object, food crushing step that the food is discharged while being quantitatively discharged after the remaining food is put into the storage tank crushed; A food drying step of transporting and crushing the food to a crushing storage tank and then quantitatively discharging the discharged food to a dryer for drying; Odor removal and wastewater purification, in which malodorous vapor generated during food drying is collected, the malodorous gas is transported to the combustion furnace and burned off, and the vapor is condensed and transported and purified to the wastewater treatment plant; A sorting step of transporting and feeding the dried food into a dry storage tank and then quantitatively discharging the discharged food to a sorter to separate the feed and the junk from each other; The selected feed is a feed shipment step of packaging and shipping in the feed facility; As the contaminants separated from the separator are put into the combustion furnace and burned, the remaining ash is discharged to the outside, and the generated combustion gas becomes a steam production heat source of the waste heat boiler, and the produced steam is recycled as a heat source of the dryer. Recycling step; And after the combustion gas discharged after being used as a heat source of the waste heat boiler is collected, harmful substances and excess dust are removed, and the combustion gas purifying and releasing the final purified air is discharged to the atmosphere.

In addition, the odor removal and wastewater purification step, the odorous vapor and dust generated during the drying of food in the dryer is collected in the cyclone dust is discarded in the lower part and the odorous vapor discharged in the upper and ; When the malodorous vapor discharged from the cyclone flows into the scrubber, water is injected to remove the malodorous component first and the excess malodorous vapor is discharged to the top; A malodorous gas and condensate separation step in which the malodorous vapor discharged from the scrubber is introduced into a heat exchanger and separated and separated from the malodorous gas and condensate; And the malodorous gas is transported to the combustion furnace to remove the odor component as the combustion process, the condensate is preferably carried out to remove the excess odor and waste water purification step to be purified to the wastewater treatment plant.

In addition, from the food crushing step to the food drying step to remove the odor and the waste water purification step, the same two processes are carried out in the two-stage system at the same time, each of the odor is a final step for the two-stage two processes After the removal and wastewater purification step, it is preferred to proceed in the integration step.

The combustion gas purifying and discharging step may include: a combustion gas temperature reduction step in which a combustion gas discharged after being used as a heat source in the waste heat boiler is introduced into a temperature reduction chamber to reduce a temperature of the combustion gas; Removing the harmful substances in which the heated combustion gas is introduced into the slaked lime storage tank, in which the slaked lime is injected to remove the harmful substances in the burned gases; A dust removal step in which the purge gas from which harmful substances have been removed passes through the dust collector and is discharged with excess dust removed; And an air discharge step in which the final purified air discharged from the dust collector is discharged to the atmosphere through the stack.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. It should be interpreted as meanings and concepts corresponding to the technical idea of the present invention based on the principle of definition.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a flow chart of the remaining food resources process according to an embodiment of the present invention, Figure 2 is a flow chart of the facility is carried out the process of Figure 1, Figure 3 is a schematic diagram of the facility is carried out the process of FIG.

Here, the leftover food means waste food having a water content of 70% to 85%. In general, the leftover food contains miscellaneous substances corresponding to foreign substances such as vinyl, bone, and metal in addition to the food.

Hereinafter will be described with reference to Figures 1 to 3 for the process of recycling the remaining food.

As shown, the remaining food (hereinafter, food) is first transported to the storage tank 110 and then discharged food while being discharged quantitatively discharged to the shredder 111 by the transfer conveyor is shredded to a predetermined size or less (S10). )

The food shredding method applied to the shredder 111 in the food shredding step (S10) may be one selected from a hammer mill method or a shredder method.

The hammer mill method is a method in which a hammer rotating at high speed strikes food and pulverizes the food as it collides with the screen and passes through the screen. The threader method is between cylinders facing each other on which blades are formed. The food is cut while being drawn, the threader (Shredder) method is capable of cutting a large particle of a relatively large particles compared to the food, as well as has the advantage of less breakdown of the crushing of the impurities.

Therefore, in the shredding method of the present invention, the shredder method is preferably applied in consideration of the shredding ability of the contaminants and the maintenance cost of the shredder 111.

On the other hand, after the food crushing step (S10), the crushed food is transferred to the crushing storage tank 112, and then discharged food while being discharged quantitatively discharged to the dryer 113 to dry the moisture contained in the food. S20)

Here, the dryer 113 may be preheated and operated by a separate boiler 114 heat source.

On the other hand, in the manner that food is transferred from the shredder 111 to the shredding storage tank 112 and the food is transported from the shredding storage 112 to the dryer 113, the piston pressure of the piston pump 117 Transfer method using can be applied.

In addition, in the food drying step (S20), steam heat is supplied to the outer wall of the dryer 113 so that indirect drying of the food is minimized such that deformation, such as corruption and deterioration, of food in the dryer 113 is performed. Indirect heat drying may be applied.

Meanwhile, as shown in FIG. 3, the odorous gas generated in the process of introducing the shredded food in the shredding step S10 to the shredding step S20 into the shredding storage tank 112 is a separate blower ( 118 may be transferred to the furnace 130 and then removed by combustion.

After the food drying step (S20), the malodorous vapor generated during food drying is collected, the malodorous gas is transferred to the combustion furnace 130 and burned off, and the steam is condensed to be transported and purified to the wastewater treatment plant. S30)

The odor removal and wastewater purification step (S30) includes a dust removal step (S31), the initial odor removal (S32) step, odorous gas and condensate separation step (S33) and excess odor removal and wastewater purification step (S34) Can be.

That is, after the food drying step (S20), the odorous steam and dust generated when the food is dried in the dryer 113 is collected in the cyclone 120 and the dust and odorous steam is separated by the centrifugal force to the upper and lower parts Dust is disposed in the lower part and odorous vapor is discharged in the upper part (S31).

After the dust removal step (S31), when the malodorous vapor discharged from the cyclone 120 flows into the scrubber 121, water is sprayed and circulated to dissolve and remove the malodorous components primarily, and the excess malodorous steam is upper Is discharged to (S32).

Here, when the water circulated in the scrubber 121 is contaminated and the odor purification ability is lowered, the contaminated water is preferably removed.

Next, after the initial odor removal (S32), the malodorous vapor discharged from the scrubber 121 is introduced into the heat exchanger 122 and is separated from each other by the malodorous gas and condensed water is discharged (S33).

Here, the heat exchanger 122 cools the introduced malodorous vapor to separate and discharge the cooled condensed water and the surplus malodorous gas into the lower and upper portions, respectively.

Next, the malodorous gas is transported to the combustion furnace 130 through a separate blower 124 and the combustion process is removed odor component, the condensate water wastewater treatment plant 123 through the wastewater transfer pump 125 It is transferred to the purification process. (S34)

According to the remaining food resource recycling process according to the present invention, after collecting the malodorous vapor generated during food drying, the malodorous substance is burned and removed, and the condensed water, which is condensed steam, is purified in a wastewater treatment plant, so that There is an effect that can prevent environmental pollution, such as water pollution and air pollution.

On the other hand, after the food drying step (S20), the food dried in the dryer 113 is transferred to the drying storage tank 115 through the transfer conveyor and put into the discharge after the quantitative discharge the food discharged through the sorting conveyor 116 The feed and the impurities are separated from each other in the sorting unit 116 is transferred to (S40).

In the sorting step (S40), to remove the contaminants such as vinyl, bone, metal from the food that can be fed from the remaining food to select a high-quality feed that the animal is edible, by the wind Specific gravity sorting or rotary type drum sorting may be applied, but the sorting method is not limited thereto.

Next, after the sorting step (S40) can be packaged and shipped after the sorted feed is transported to the feed facility by the transfer conveyor. (S50)

In addition, after the sorting step (S40), the selected contaminant is put into the combustion furnace 130 and the remaining ash is discharged to the outside by a transfer conveyor, the combustion gas generated during the combustion of the waste heat boiler 131 After the steam production heat source, the produced steam is transferred through the blowing fan 132 is to be recycled to the heat source of the dryer 113 (S60).

Here, the combustion gas is a hot gas containing harmful substances generated during combustion, and may be a heat source for operating the waste heat boiler 131 while passing through the waste heat boiler 131.

In the combustion and waste heat recycling step (S60), in the combustion furnace 130, the odorous gas discharged in the odor removal and wastewater purification step (S30) is also burned together with the contaminant to be a heat source of the waste heat boiler 131 Can be utilized.

Meanwhile, the waste heat boiler 131 may be arranged in plural, so that the remaining waste heat boiler 131 may be continuously operated even if one waste heat boiler 131 cannot be operated by failure or inspection.

By the above method, the dryer 113 is initially operated by a separate boiler 114, and subsequently operated by supply of a heat source through combustion gas generated during combustion in the combustion and waste heat recycling step S60. Can be.

According to the combustion and waste heat recycling step (S60), as the selected contaminants are burned, the ash component can be discarded, as well as the dry energy is saved by recycling the combustion gas generated during combustion to the heat source of the dryer 113. And maintenance costs of the facility can be reduced.

On the other hand, after the combustion and waste heat recycling step (S60), after the combustion gas discharged after being used as a heat source of the waste heat boiler 131 is collected by the blowing fan 133, harmful substances and excess dust in the collected combustion gas This is removed and the final purified air is discharged to the atmosphere (S70).

The combustion gas purifying and releasing step (S70) may include a combustion gas temperature reduction step (S71), harmful substance removal step (S72), dust removal step (S73) and air discharge step (S74).

That is, after the combustion and waste heat recycling step (S60), the combustion gas discharged after being used as a heat source in the waste heat boiler 131 flows into the temperature sensing chamber 140, so that it is easy to discharge harmful substances later. The temperature is reduced (S71).

After the combustion gas temperature reduction step (S71), when the temperature-treated combustion gas flows into the slaked lime storage tank 141, the slaked lime is sprayed to remove harmful substances in the burned gas (S72).

In the step of removing the harmful substances (S72), the harmful substances that cause air pollution such as dioxins, heavy metals, and acid gases contained in the combustion gas may be adsorbed and removed by the slaked lime.

Next, the purge gas from which the harmful substances have been removed passes through the dust collector 142 and is discharged in a state where excess dust is removed.

In the dust removing step (S73), it is possible to remove excess dust, which is a particulate matter, through the bag filter dust collector 142, the dust removal method of the dust collector 142 is not limited thereto.

Next, the final purified air discharged from the dust collector 142 may be discharged to the atmosphere through the stack 143 which is the discharge tower through the blowing fan 144. (S74)

According to the combustion gas purifying and discharging step (S70), environmental pollution can be prevented because the purified air from which noxious components are removed from the combustion gas generated during combustion is discharged to the atmosphere.

Meanwhile, in the remaining food resource recycling process of the present invention as described above, approximately 85% of the foods dried in the dryer 113 and transferred to the sorter 116 are transported and combusted to the combustion furnace 130 together with the impurities. The dryer 113 is recycled as a heat source, and the remaining 15% may be recycled into animal feed.

That is, for example, a total of 100 tons of food containing water is reduced to 20 tons of food by removing water in the food drying step (S20), and after the screening step (S40), the contaminants in the 20 tons of food This included 17 tons may be transported and combusted into the combustion furnace 130 to be a heat source of the dryer 113 or to be purified and discharged to the atmosphere, and the remaining 3 tons may be feed.

In addition, when the contaminants selected through the sorting unit 116 are transferred to the combustion furnace 130, the feedable food may also be transported and combusted in the mixed state with the contaminants, for example, feed consumption in a farmhouse or the like. As it decreases, the ratio of the feedable food to the contaminants may increase. In other words, when the demand is less than the supply of feed, it is possible to cope with the market changes by recycling the foods that can be formulated as above as a combustion treatment and a dry heat source.

On the other hand, from the food crushing step (S10) through the food drying step (S20) to the odor removal and waste water purification step (S30), two-sequence in which the same two processes are carried out at the same time as shown in FIG. It may be proceeded to, and after each of the odor removal and wastewater purification step (S30), which is the last step for the two series of two processes can be integrated in the screening step (S40).

According to the two-sequenced method, even if one series process is inoperable due to failure or inspection, the other series process is continuously operated so that the remaining food resource recycling process can be continuously performed.

As described above, according to the remaining food resource recycling process according to the present invention, not only the remaining food can be recycled as a resource by feed, but also the removal of the odor generated during food drying and the purification of contaminated condensate, as well as combustion It releases the purified air from which the harmful components are removed from the combustion gas into the atmosphere, thereby reducing the environmental pollution problems such as water pollution and air pollution.

In addition, it is possible to reduce the maintenance costs including operating costs of the dryer by recycling the combustion gas generated during combustion as a food drying heat source.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is described by the person of ordinary skill in the art to which the present invention pertains. Various modifications and variations are possible without departing from the scope of the appended claims.

According to the remaining food resource recycling process according to the present invention provides the following effects.

First, the remaining food can be fed and recycled as a resource.

Second, the odorous vapors generated during food drying are collected and the odorous substances are burned and removed. The condensed water, which is condensed steam, is not only purified at the wastewater treatment plant, but also clarified air is removed from the combustion gases generated during combustion. It is possible to reduce the environmental pollution problems such as water pollution and air pollution by releasing to the atmosphere.

Third, by using the combustion gas generated during combustion to recycle the food drying heat source it can save the drying energy and at the same time reduce the maintenance cost of the facility.

Claims (6)

A food shredding step in which the foods discharged while being quantitatively discharged after the remaining foods are put into the storage tank are shredded by a hammer mill method or a shredder method; After the crushed food is transferred to the crushing storage tank and put into the crushing storage tank, the discharged food is transferred to the dryer which is preheated and operated by a separate boiler heat source and dried, and steam heat is supplied to the outer wall of the dryer so as to indirectly dry the food without deformation. A food drying step to which an indirect heat drying method is applied; Odor removal and wastewater purification, in which malodorous vapor generated during food drying is collected, the malodorous gas is transported to the combustion furnace and burned off, and the vapor is condensed and transported and purified to the wastewater treatment plant; After the food is dried and transported to the dry storage tank, the discharged food is discharged to the sorting step of the drum-type sorting or gravity-type sorting by the wind is fed to the sorting step of the feed and the impurities are separated from each other; The selected feed is a feed shipment step of packaging and shipping in the feed facility; Selected contaminants are put into and combusted in the combustion furnace, the remaining ash is discharged to the outside, the generated combustion gas is a steam production heat source of the waste heat boiler, the steam produced is recycled to the heat source of the dryer and waste heat recycling step; And After the combustion gas discharged after being used as the heat source of the waste heat boiler is collected, the combustion gas purification and discharge step of removing the harmful substances and excess dust and the final purified air is discharged to the atmosphere, The odor removal and wastewater purification step, A dust removal step in which malodorous steam and dust generated during drying of food in the dryer are collected in a cyclone, and dust is disposed at a lower portion by centrifugal force and at which an odorous steam is discharged at an upper portion; When the malodorous vapor discharged from the cyclone flows into the scrubber, the water is injected and circulated to remove the malodorous component is primarily dissolved and the excess malodorous steam is discharged to the top; A malodorous gas and condensate separation step in which the malodorous vapor discharged from the scrubber flows into the heat exchanger and is separated from the malodorous gas and the condensate by cooling; And The malodorous gas is transported to the combustion furnace to remove the malodorous component as it is burned, and the condensate is transferred to the wastewater treatment plant to remove excess malodor and purify the wastewater, The combustion gas purge and discharge step, A combustion gas temperature reduction step in which the combustion gas discharged after being used as a heat source in the waste heat boiler is introduced into the temperature reduction chamber to reduce the temperature of the combustion gas; Removing the harmful substances in which the heated combustion gas is introduced into the slaked lime storage tank, in which the slaked lime is injected to remove the harmful substances in the burned gases; The purge gas from which the harmful substances have been removed is a dust removal step that is discharged while the excess dust is removed while passing through the dust collector; And The final purified air discharged from the dust collector includes an air discharge step of being discharged to the atmosphere through the stack, From the food shredding step to the food drying step to the odor removal and wastewater purification step, the same two processes are carried out in two series, which is the last step for each of the two series. After the waste water purification step, the remaining food resource recycling process characterized in that the integration proceeds in the screening step. delete According to claim 1, In the food drying step, The food is transferred from the crusher to the crushing storage tank and the food is transferred to the dryer from the crushing storage tank, the remaining food resources process, characterized in that the transfer method using the piston pressure of the piston pump. delete delete delete

Images