A recycling system for the combustion and utilization of food manufacturing by-products.

Abstract

To provide a combustion-using circulation system for a food manufacturing byproduct which improves efficiency of energy in the combustion-using circulation system by using steam generated by a biomass boiler in a production device and using it for drying a manufacturing byproduct combusted by the biomass boiler.SOLUTION: A combustion-using circulation system 10 for a food manufacturing byproduct has: a biomass boiler 16 for combusting a food manufacturing byproduct 14 generated in a food production facility to generate steam; a pipe 24 as a first flow for feeding the steam generated by the biomass boiler 16 to a food production device 12 in the food production facility; a header 22; a pipe 40; and a pipe 48 as a second flow for feeding a part of the steam supplied to the first flow to a dryer 18 for drying the food manufacturing byproduct 14.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a combustion utilization circulation system for food manufacturing by-products.

Background Art

[0002] There is a system in which a food manufacturing by-product, which is a biomass fuel, is burned in a biomass boiler and the produced steam is utilized within a food production facility (see, for example, Patent Document 1). In the system of Patent Document 1, food residue, which is a food manufacturing by-product, is dried in a dryer, the dried food residue is burned in a waste combustion boiler, and the steam generated in the waste combustion boiler is supplied to a steam turbine to drive a second generator with the steam turbine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the system of Patent Document 1, energy for operating a dryer for drying food residue, which is a food manufacturing by-product, is separately required, and there is room for improvement.

[0005] In consideration of the above facts, an object of the present invention is to improve the energy efficiency of a combustion utilization circulation system by using the steam generated in a biomass boiler in a production device and also using it for drying manufacturing by-products burned in the biomass boiler.

Means for Solving the Problems

[0006] First aspectThe combustion utilization recycling system for food manufacturing by-products described herein includes a biomass boiler that burns food manufacturing by-products generated at a food production facility to produce steam, a first flow that sends the steam generated by the biomass boiler to food production equipment within the food production facility, and a second flow that sends a portion of the steam sent to the first flow to a dryer that dries the food manufacturing by-products.

[0007] First aspect In the combustion and recycling system for food manufacturing by-products described above, steam generated by burning food manufacturing by-products in a biomass boiler is sent in the first flow to food production equipment within the food production facility and used as heat for the food production equipment. In addition, the second flow sends a portion of the steam sent to the first flow to a dryer that dries the food manufacturing by-products, so that no additional energy is required to operate the dryer, thus improving energy efficiency.

[0008] Second aspect The invention described herein relates to a combustion utilization and recycling system for food manufacturing by-products as described in claim 1, wherein a high-calorie food manufacturing by-product with a higher calorific value than the food manufacturing by-product is mixed with the food manufacturing by-product to be burned in the biomass boiler.

[0009] Second aspect In the combustion utilization recycling system for food manufacturing by-products described above, the necessary amount of heat can be obtained within the food production facility by mixing high-calorie food manufacturing by-products, which have a higher calorific value than the regular food manufacturing by-products, with the regular food manufacturing by-products.

[0010] Third aspect The invention described herein relates to a combustion utilization circulation system as described in claim 1, wherein the gas boiler that supplies steam to the food production apparatus and the amount of steam supplied from the gas boiler to the food production apparatus and the amount of steam supplied from the biomass boiler to the food production apparatus are adjusted. It also includes a steam volume adjustment unit that stabilizes the amount of steam supplied to the food production apparatus.

[0011] Third aspectIn the combustion utilization and recycling system for food manufacturing by-products described above, the steam volume adjustment unit adjusts the amount of steam supplied from the gas boiler to the food production equipment and the amount of steam supplied from the biomass boiler to the food production equipment, thereby stabilizing the amount of steam supplied to the food production equipment. [Effects of the Invention]

[0012] As described above, the combustion utilization circulation system of the present invention makes it possible to improve the energy efficiency of the combustion utilization circulation system by utilizing the steam generated in the biomass boiler in the production equipment and also using it to dry the manufacturing by-products that are burned in the biomass boiler. [Brief explanation of the drawing]

[0013] [Figure 1] This is a block diagram illustrating an overview of a combustion-based recycling system for food manufacturing by-products related to one embodiment of the present invention. [Figure 2] This is an explanatory diagram showing the flow of food manufacturing by-products and steam in a combustion utilization recycling system for food manufacturing by-products according to one embodiment of the present invention. [Modes for carrying out the invention]

[0014] Using Figures 1 and 2, an embodiment of the present invention will be described as a combustion utilization recycling system 10 for food manufacturing by-products. The combustion utilization recycling system 10 is applicable, for example, to food production facilities such as food factories, and includes a biomass boiler 16 that uses food manufacturing by-products 14 discharged from production equipment (production lines) 12 involved in food manufacturing as fuel, a dryer 18 that dries the food manufacturing by-products 14 using steam generated in the biomass boiler 16, a gas boiler 20, and a header 22 that supplies the steam generated in the biomass boiler 16 and the steam generated in the gas boiler 20 to the production equipment 12. Examples of production equipment 12 include noodle dryers and jacketed kettles, but their configuration and purpose are not particularly limited.

[0015] The biomass boiler 16 and the header 22 are connected by a pipe 24, and the steam generated by the biomass boiler 16 is supplied to the header 22 via the pipe 24. Incidentally, an on-off valve 26, a pressure regulating valve (pressure reducing valve) 28, an on-off valve 30, etc. are attached in the middle of the pipe 24.

[0016] The gas boiler 20 generates steam using gas G as fuel as an example, but it may be replaced with a boiler using a fuel other than gas such as petroleum or heavy oil. Incidentally, the combustion exhaust gas generated by the gas boiler 20 is discharged into the atmosphere.

[0017] The gas boiler 20 and the header 22 are connected by a pipe 32, and the steam generated by the gas boiler 20 can be supplied to the header 22 via the pipe 32. An on-off valve 34, a pressure regulating valve (pressure reducing valve) 36, an on-off valve 38, etc. are attached in the middle of the pipe 32.

[0018] The pressure regulating valve 28 and the pressure regulating valve 36 of the present embodiment are examples of the adjusting unit of the present invention.

[0019] Incidentally, the production device 12 may directly utilize steam when manufacturing food, or may indirectly utilize it, and its configuration is not particularly limited. The production device 12 and the header 22 are connected by a pipe 40, and the steam supplied to the header 22 is supplied to the production device 12 via the pipe 40. Incidentally, an on-off valve 42, a pressure regulating valve (pressure reducing valve) 44, an on-off valve 46, etc. are attached in the middle of the pipe 40.

[0020] Also, the steam supplied to the header 22 is configured to be supplied to the dryer 18 via the pipe 48. Incidentally, an on-off valve 50, a pressure regulating valve (pressure reducing valve) 52, an on-off valve 54, etc. are attached in the middle of the pipe 48. Here, the pipe 24, the header 22, and the pipe 40 of the present embodiment are an example of the first flow of the present invention, and the pipe 48 of the present embodiment is an example of the second flow of the present invention. Also, the pressure regulating valve 28 and the pressure regulating valve 36 of the present embodiment are an example of the steam amount regulating unit of the present invention.

[0021] The dryer 18 of the present embodiment is configured, as an example, to supply steam between an inner container into which the food production by-product 14 is introduced and an outer container provided outside the inner container, and to heat and dry the food production by-product 14 introduced into the inner container. Incidentally, the dryer 18 may have any configuration as long as it utilizes the heat of steam.

[0022] (Function, Effect) Next, the treatment of the food production by-product 14 using the combustion utilization circulation system 10 of the present embodiment will be described. As shown in FIG. 2, it is determined whether the food production by-product 14 discharged from the production apparatus (or production line) 12 can be burned. The food production by-product 14 is divided into those that can be burned and those that cannot be burned, and those that cannot be burned are discarded. Since the food production by-product 14 has various types and forms, the component inspection of the food production by-product 14 discharged from the production apparatus 12 is performed in advance to determine whether it can be burned. Also, as an example, the food production by-product 14 includes food scraps that are not actually used for food and solids in the wastewater used for washing food. An example of the determination of whether combustion is possible is described below. (1) The calorific value of the food production by-product 14 (2) Harmfulness during combustion (including flue gas components) (3) Handling property as a fuel

[0023] Next, the combustible food manufacturing by-products 14 are sorted based on their moisture content, etc. In this embodiment, as an example, they are sorted into ultra-high moisture content by-products 14A with a moisture content of 80% or more, high moisture content by-products 14B with a moisture content exceeding 60% but less than 80%, low moisture content by-products 14C with a moisture content of 60% or less, and by-products utilizing binders 14D.

[0024] Furthermore, since the ultra-high moisture content by-product 14A, which has a moisture content of 80% or more, is difficult to dry, it is dehydrated using a dehydration device that physically removes moisture, such as a filter press, to reduce the moisture content to less than 80% (for example, high moisture content by-product 14B, which has a moisture content exceeding 60% but less than 80%).

[0025] High-moisture by-product 14B, which has a moisture content exceeding 60% but less than 80%, is not easily combustible, so it is heated in a dryer 18 and dried until the moisture content is 60% or less to obtain low-moisture by-product 14C with a moisture content of 60% or less.

[0026] In this embodiment, a moisture content of 60% or less is used as an example of a guideline for determining whether a product is combustible, but the moisture content is not limited to 60% or less. Furthermore, the moisture content of each food manufacturing by-product 14 can be determined by performing a component analysis of the food manufacturing by-product 14 discharged from the production device 12.

[0027] Furthermore, even if the moisture content is 60% or less, if the by-product is difficult to handle and does not hold together well, it is preferable to mix it with a binder (for example, a fibrous material or a sticky material) selected from the food manufacturing by-products 14 discharged from the production equipment 12, and mold it into pellets that are easy to handle and easy to feed into the biomass boiler 16.

[0028] In the biomass boiler 16, one, two, or all three of the following are used as fuel: a self-combustible low-moisture by-product 14C, a high-moisture by-product 14B dried in a dryer 18 until its moisture content is 60% or less (low-moisture by-product 14C), and a food manufacturing by-product molded into pellets.

[0029] For example, if there is a food manufacturing by-product 14E that is self-combustible, does not need to be dried, and has a high calorific value (high heat output when burned), it is preferable to put the food manufacturing by-product 14E into the biomass boiler 16.

[0030] High-calorific food manufacturing by-products 14E include, for example, those with a high oil content, such as tempura batter scraps. This allows for more efficient drying in the dryer 18 compared to burning food manufacturing by-products 14 with lower calorific values, such as food manufacturing by-products with a higher moisture content than food manufacturing by-products 14E.

[0031] In this embodiment, self-combustible materials such as low-moisture by-products 14C and high-moisture by-products 14B that have been dried in a dryer 18 until their moisture content is 60% or less (low-moisture by-product 14C), and food manufacturing by-products formed into pellets, can be temporarily stored in a silo or tank (not shown) before being fed into the biomass boiler 16, and the stored materials can be appropriately fed into the biomass boiler 16.

[0032] In the "mixing" stage shown in Figure 2, various food manufacturing by-products are mixed to produce a combustible fuel, ensuring it is self-combustible and considering moldability, while controlling the moisture content.

[0033] Furthermore, in order to improve the quality and handling of the food manufacturing by-product 14 as fuel, a "molding process (shaping the food manufacturing by-product 14 into a predetermined shape (such as pellets))" as shown in Figure 2 may be added. It is preferable to use the food manufacturing by-product 14 as the binder necessary for this molding process, and to produce the fuel for the biomass boiler 16 using only the food manufacturing by-product 14.

[0034] The biomass boiler 16 can burn self-combustible food manufacturing by-products 14, and the steam generated in the biomass boiler 16 is used in the production equipment 12 for heating food, etc., and is also used as a heat source for the dryer 18.

[0035] In this embodiment of the combustion utilization recycling system 10, the biomass boiler 16 and the gas boiler 20 are always in operation when the production device 12 is running.

[0036] In the combustion-based circulation system 10 of this embodiment, as an example, the set pressure of the pressure regulating valve (reducing valve) 36 is set to < the set pressure of the pressure regulating valve (reducing valve) 28. During normal operation (for example, when there is sufficient fuel in the biomass boiler 16), the pressure of the steam supplied to the header 22 is higher on the biomass boiler 16 side than on the gas boiler 20 side. The pressure inside the header 22 is lower than the set pressure of the pressure regulating valve (reducing valve) 36 and the set pressure of the pressure regulating valve (reducing valve) 28.

[0037] In other words, during normal operation, the steam supply pressure from the biomass boiler 16 is higher than the steam supply pressure from the gas boiler 20 in the header 22, so the steam from the biomass boiler 16 is preferentially supplied to the production equipment 12.

[0038] In the combustion utilization circulation system 10 of this embodiment, for example, if there is a shortage of food manufacturing by-products 14 to be burned, and the amount of steam generated by the biomass boiler 16 decreases, and the steam pressure of the biomass boiler 16 drops, the amount of steam supplied from the gas boiler 20 to the header 22 increases to compensate for the shortage of steam generated by the biomass boiler 16, and the gas boiler 20 acts as a backup.

[0039] In the combustion utilization recycling system 10 of this embodiment, the steam generated in the biomass boiler 16 is used in the production device 12 and also used to dry the food manufacturing by-products 14 that are burned in the biomass boiler 16, thereby improving the energy efficiency of the combustion utilization recycling system 10. Furthermore, in the combustion utilization recycling system 10 of this embodiment, as described above, a biomass boiler 16 and a dryer 18 are used, so food manufacturing by-products 14 with a wide range of moisture content can be processed all at once, thereby reducing CO2 emissions and waste.

[0040] Furthermore, if drying is not required and the high-calorific value of the food manufacturing by-product 14E can be burned in the biomass boiler 16, not only can a large amount of heat (steam) be obtained within the production facility, but it can also be effectively utilized as the heat required in the drying process of the food manufacturing by-product 14, which requires drying.

[0041] Furthermore, the exhaust gas generated by the biomass boiler 16 may be released into the atmosphere, or the heat from the exhaust gas may be used in the production equipment 12, etc.

[0042] The gas boiler 20 in this embodiment basically continues to operate in response to the load, and when the steam demand on the production equipment 12 side fluctuates, the amount of gas G input is changed to change the amount of steam generated, that is, the load can be changed.

[0043] [Other embodiments] Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above, and can be implemented in various ways without departing from the spirit of the invention. [Explanation of symbols]

[0044] 10 Combustion-based recycling system 12 Production equipment 14. Food manufacturing by-products 16. Biomass boiler 18 Dryer 20 Gas boilers 22 Header (First Flow) 24 Piping (First Flow) 28 Pressure regulating valve (steam volume adjustment section) 36. Pressure regulating valve (steam volume adjustment section) 40 Piping (First Flow) 48 Piping (Second Flow)

Claims

1. A food production apparatus that utilizes steam and is installed within a food production facility, A dryer for drying food manufacturing by-products discharged from the aforementioned food production apparatus, A biomass boiler that generates steam by burning food manufacturing by-products generated at the aforementioned food production facility, A first flow that sends the steam generated in the biomass boiler to the food production apparatus, A second flow sends a portion of the steam sent to the first flow to the dryer, A recycling system for the combustion and utilization of food manufacturing by-products.

2. The food manufacturing by-products burned in the biomass boiler are mixed with high-calorie food manufacturing by-products that have a higher calorific value than the food manufacturing by-products. The aforementioned food manufacturing by-product has a higher water content than the aforementioned high-calorie food manufacturing by-product. A combustion and recycling system for food manufacturing by-products according to claim 1.

3. A gas boiler that supplies steam to the aforementioned food production apparatus, A steam quantity adjustment unit adjusts the amount of steam supplied from the gas boiler to the food production apparatus and the amount of steam supplied from the biomass boiler to the food production apparatus to stabilize the amount of steam supplied to the food production apparatus, It has, The steam quantity adjustment unit is, A gas boiler-side pressure regulating valve is provided in the piping that supplies steam from the gas boiler, A biomass boiler-side pressure regulating valve is provided in the piping that supplies steam from the biomass boiler, Equipped with, The set pressure of the gas boiler-side pressure control valve is set lower than the set pressure of the biomass boiler-side pressure control valve. A combustion and recycling system for food manufacturing by-products according to claim 1.

4. The dryer is An inner container into which the aforementioned food manufacturing by-products are placed, An outer container provided on the outside of the inner container, It has, Steam is supplied between the inner container and the outer container to heat and dry the food manufacturing by-products placed in the inner container. A combustion and recycling system for food manufacturing by-products according to any one of claims 1 to 3.

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