JP2015003965A - Okara fuel, okara fuel production device and okara combustion heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide bean curd refuse fuel, a bean curd refuse fuel production apparatus, and a bean curd refuse combustion heating device capable of efficiently burning bean curd refuse fuel and using thermal energy efficiently by a simple device.SOLUTION: A bean curd refuse combustion heating device has: a combustion furnace 26 that burns solid fuel having bean curd refuse as a main component; and a combustion chamber 24 that houses the combustion furnace 26 therein. The device comprises: an air blower 42 that sends air for combustion of the combustion furnace 26 and air for heating; an air supply main pipe 44 connected to the air blower 42; and an air supply pipe 40 which is branched from the air supply main pipe 44 and sends air to the combustion furnace 26. The device comprises: an air duct 46 to which the air supply main pipe 44 is connected; and a heat exchanger 28 which is connected to the air duct 46 and fixed above the combustion chamber 24. The device also comprises: a heat exchange pipe 52 which is provided in the heat exchanger 28 and communicated into the air duct 46; and a hot air pipe 54 communicated into the heat exchange pipe 52. Air sent from the air duct 46 exchanges heat with heat such as combustion gas by the heat exchange pipe 52 and is sent to the hot air pipe 54.

Description

  The present invention relates to an okara fuel, an okara fuel production apparatus, and an okara combustion heating apparatus that use okara discharged in a tofu production process as fuel and extract thermal energy.

  Conventionally, for example, okara, which is a food pomace that is discharged in the tofu manufacturing process, is discharged in large quantities, so the okara after squeezing the soy milk at the tofu manufacturing factory is carried out and processed as industrial waste . However, Okara has a high water content of about 85%, and a large amount of fuel is required for incineration as waste, and the treatment has a large environmental load.

  Therefore, as disclosed in Patent Document 1, a method of using okara that uses okara rolled and dried, formed into a sheet, and used as fuel is also proposed.

  On the other hand, as disclosed in Patent Document 2, a combustion method using biomass fuel such as trees and bamboo and a method for using the same have also been proposed.

JP 2007-43974 A JP 2007-19621 A

  However, the method of using okara disclosed in Patent Document 1 is costly and time consuming to roll and dry okara, and is not efficient, and the thermal energy obtained by combustion without burning okara efficiently The use of was also limited. Furthermore, the method of using biomass fuel disclosed in Patent Document 2 simply burns biomass such as trees and uses it as a heat source, or uses its ash as a fertilizer. Energy efficiency and heat for biomass fuel combustion It does not take into account the improvement of exchange efficiency.

  The present invention has been made in view of the above-mentioned background art, and can be manufactured at a low cost and with a simple device as a main component of okara. The okara fuel can be efficiently burned. It is an object of the present invention to provide an okara fuel, an okara fuel production apparatus, and an okara combustion heating apparatus that can efficiently use the thermal energy obtained by combustion.

  The present invention is an okara fuel formed by mixing a dried okara and a food waste oil, which is a waste oil used in the processing of food, and stirring it to form a powdery fuel.

  The fuel is a mixture of the dried okara and the waste food oil in a volume ratio of 70-30: 10-3. The fuel may be mixed with rice husk.

  The present invention also provides a hollow main body into which a soymilk-squeezed okara is put, a stirring blade provided in the main body for stirring the okara, a hot air inlet formed in the main body, and a hot air An outlet is provided, and hot air or exhaust heat obtained from a heating device is sent to the hot air inlet, and the okara fuel is dried while stirring the okara in the main body and burned in the heating device. Okara fuel production equipment to be manufactured.

  The present invention also provides a combustion furnace for burning solid fuel mainly composed of okara, a combustion chamber containing the combustion furnace, and a blower for sending combustion air and heating air in the combustion furnace. An apparatus, an air supply main connected to the blower, an air supply pipe branched from the air supply main to send air to the combustion furnace, a blow pipe connected to the air supply main, A heat exchanger connected to the blower pipe and fixed above the combustion chamber, a heat exchange pipe provided in the heat exchanger and communicated with the blower pipe, and a hot air pipe communicated with the heat exchange pipe The combustion gas in the combustion chamber passes through the heat exchanger and is exhausted, and the air sent from the blower pipe exchanges heat with the heat of the combustion gas through the heat exchange pipe. Okara combustion heating system sent to the pipe.

  A fuel agitating and extruding device for mixing and supplying okara and the food waste oil is provided on the side of the combustion chamber, and the okara fuel sent from the fuel agitating and extruding device is supplied to the combustion furnace together with air. Is. Further, the combustion furnace may be provided with a supply pipe for supplying liquid fuel.

  The okara fuel, okara fuel production apparatus and okara combustion heating apparatus of the present invention are used as fuel by effectively utilizing the okara that has been disposed of in the past, and the calorific value is high and the heating effect is also large. is there. Furthermore, a heat exchanger is provided above the combustion chamber, and heat can be exchanged well between the combustion gas and the air to be blown, and hot air can be sent out efficiently. Thereby, heating of a greenhouse etc. can be performed efficiently cheaply.

It is the schematic which shows the Okara combustion heating apparatus of one Embodiment of this invention. It is an expanded sectional view of the combustion furnace of the Okara combustion heating apparatus of one embodiment of this invention. It is a flowchart which shows the manufacturing process of the okara fuel used for the okara combustion heating apparatus of one Embodiment of this invention. It is a schematic sectional drawing which shows the forehead fuel manufacturing apparatus of one Embodiment of this invention. It is a general | schematic expanded sectional view which shows the other example of the combustion furnace of the Okara combustion heating apparatus of one Embodiment of this invention.

  Hereinafter, an okara fuel, an okara fuel manufacturing apparatus, and an okara combustion heating apparatus according to an embodiment of the present invention will be described with reference to FIGS. The okara combustion heating apparatus 10 according to this embodiment uses a squeezed okara obtained by squeezing soy milk from soybeans, and produces fuel mainly composed of okara and supplies it to a combustion chamber 24 described later. An extrusion device 12 is provided. The fuel agitating and extruding apparatus 12 includes a hopper 14 into which okara, food waste oil and rice husk are charged, an extrusion tube 16 in which a side opening 16a is in communication with a lower end opening 14a of the hopper 14, and the extrusion tube 16 And a delivery tube 18 that extends downward from the front end of the device.

  The hopper 14 has an upper end opening 14 b formed in a large area, and a lower end opening 14 a having a small cross-sectional area is connected to the side opening 16 a so as to communicate with the extruded tube 16. Okara, which is the remaining squeezed soymilk, is introduced into the hollow internal space 14 c from the upper surface opening 14 b of the hopper 14. The material to be input is made by a manufacturing process described later, and includes dried okara, food waste oil of edible oil used for the production of fried chicken, and rice husk as appropriate.

  In the hopper 14, two stirring blades 13 are provided on the upper and lower sides, and the dried okara, food waste oil, and rice husk charged in the hopper 14 are evenly mixed. The stirring blade 13 is fixed to the shaft 15 and is rotated by a motor 17. An extrusion screw 19 is provided in the extrusion tube 16, and the extrusion screw 19 is fixed to a shaft 21 and rotated by a motor 23.

  The distal end opening 18 a of the delivery cylinder 18 is located in the receiving member 20 having an inverted truncated cone shape, and the small diameter portion 20 a of the receiving member 20 communicates with the fuel supply pipe 22. The fuel supply pipe 22 is formed by being bent into a vertical portion 22a and an inclined portion 22b, and a tip end opening 22c of the inclined portion 22b is positioned above the combustion furnace 26 in the combustion chamber 24 of the okara combustion heating apparatus 10. doing. A temperature sensor (not shown) is provided at the tip of the inclined portion 22b, and the combustion temperature of the combustion furnace 26 is detected and used for temperature control.

  The combustion chamber 24 is formed in a large-diameter cylindrical shape, a combustion furnace 26 is attached to the lower part, and a heat exchanger 28 is attached to the upper part. A chimney 30 for discharging combustion gas and smoke is attached above the heat exchanger 28.

  As shown in FIG. 2, the combustion furnace 26 is provided with a bottomed cylindrical fuel holding cylinder 34 in which a ventilation hole is formed around and at the bottom in a bottomed cylindrical main body 32 opened upward. In addition, above the bottom portion of the fuel holding cylinder 34, a fuel mounting portion 36 such as a saw blade is attached. On the fuel mounting part 36, the okara fuel 38 which consists of dry okara etc. is mounted, and it is provided so that combustion is possible. A food waste oil supply pipe 27 extends above the combustion furnace 26. The supply pipe 27 supplies only food waste oil or food waste oil and air. The supply pipe 27 supplies fuel to a combustion cylinder 72 of food waste oil, which will be described later, and air so that the silicic acid of the okara fuel 38 containing rice husks does not solidify. Is blown away.

  Combustion air is supplied to the combustion furnace 26 through the air supply pipe 40 from the outside of the combustion chamber 24. The air supply pipe 40 is connected to an air outlet 42a of an air supply blower 42 installed outside and is branched from the air supply main pipe 44 by a thin pipe. The air supply main pipe 44 is connected to a large-diameter air pipe 46 connected to the heat exchanger 28, and supplies most of the air to the air duct 46. The air supply main pipe 44 is also connected to a pipe 48 connected to an air supply nozzle 50 for supplying exhaust gas to promote exhaust.

  The blower pipe 46 to which the tip of the air supply main pipe 44 is connected communicates with the numerous heat exchange pipes 52 of the heat exchanger 28, and feeds the supplied air into the heat exchange pipe 52. The space outside the heat exchange pipe 52 in the heat exchanger 28 is provided so that the combustion gas and smoke exhausted in the combustion chamber 24 and heated air can pass therethrough, and communicates with the chimney 30. A hot air pipe 54 communicating with the other opening of the heat exchange pipe 52 is connected to the opposite side of the heat exchanger 28 from the air duct 46, and the tip opening of the hot air pipe 54 is, for example, in the greenhouse 60. It is open.

  The chimney 30 is preferably open to the outside of the greenhouse 60, but the blower 42 may be disposed either inside or outside the greenhouse 60. If it arrange | positions out of the greenhouse 60, fresh air can always be supplied in a greenhouse, and if it arrange | positions in the greenhouse 60, thermal efficiency improves more and it can suppress energy consumption.

  Drying from okara uses a simple kara drying apparatus 62 as shown in FIG. 4 and uses exhaust heat in the tofu production plant or hot air from the chimney 30 or the hot air tube 54 in the combustion chamber 24. good. The okara drying apparatus 62 is provided with a hot air inlet 64a and a hot air outlet 64b at two locations above a cylindrical hollow main body 64, and a dry okara discharge port (not shown) that can be opened and closed below. Yes. In the main body 64, stirring blades 68 that are alternately attached to the rotation shaft 66 are provided at different angles, and a drive motor 70 that rotates the stirring blade 68 is provided at the base end portion of the rotation shaft 66. .

  Next, the production of okara fuel 38 will be described with reference to FIG. Okara, which is a raw material for the okara fuel 38, is produced in large quantities in the manufacturing process of tofu and is disposed of as industrial waste. As shown in FIG. 3, the okara is formed by washing and pre-treating beans such as soybeans, which are raw materials for tofu (S1), and grinding to form a paste (S2), which is then boiled (S3). ). Thereafter, the soy milk that is the source of tofu is squeezed out (S4). The squeezed rice cake that has been squeezed out of soy milk comes from okara (S5). Okara has a very high water content of about 85%, so it does not burn as it is, and is burned using a large amount of fuel when it is treated as waste. In this embodiment, okara is dried without requiring special energy, and is mixed with food waste oil or the like and used as fuel as will be described later. The degree of drying from okara may be set as appropriate. For example, when it is 20% or less, preferably 10% or less, it can be satisfactorily used as fuel (S7).

  Thereafter, dried okara, food waste oil and rice husk are put into the hopper 14 and mixed by stirring (S7), and okara fuel which is a biofuel used in the present invention is completed (S8). The ratio of dried okara, food waste oil and rice husk can be appropriately set in a volume ratio of, for example, 70 to 30:10 to 3:10 to 0, preferably 60 to 35:10 to 5: 8 to 0. It is. The calorific fuel 38 produced under these conditions was measured for its calorific value by combustion. As a result, a high calorific value of 32500 J / g was obtained, and it was confirmed that it could be used satisfactorily as a fuel.

  Here, another example of the combustion furnace 26 of the okara combustion heating apparatus 10 will be described with reference to FIG. The combustion cylinder 72 is used by replacing the main body 34 of the combustion furnace 26, and burns only food waste oil. The combustion cylinder 72 has an air intake hole 72a on the bottom surface, an air supply pipe 74 is erected from the air intake hole 72a, and the air blown further extends horizontally from the upper end portion of the air supply pipe 74 in four directions at intervals from each other. A tube 76 is provided. The horizontal direction of the opening 76a is aligned at each tip of the blower tube 76 so that an air flow is generated in a certain rotational direction. A through hole 74a is formed around the lower end portion of the air supply tube 74 so that air is sent to the periphery. In the vicinity of the front end portion of the blower pipe 76, the front end portion of the supply pipe 27 is opened, and food waste oil is supplied into the combustion cylinder 72.

  Next, the operation of the okara combustion heating apparatus 10 according to the present invention will be described. Okara fuel 38 of the okara combustion heating apparatus 10 is agitated by the agitating blades 13 in the hopper 14 of the fuel agitating and extruding apparatus 12 at the above blending ratio. The stirred okara fuel 38 falls into the extruding tube 16 and is pushed out of the extruding tube 16 by the extruding screw 19 and delivered into the delivery cylinder 18. In the delivery cylinder 18, the okara fuel 38 pushed out from the extrusion screw 19 falls downward and is supplied to the fuel supply pipe 22 through the receiving member 20. At this time, outside air is sucked from the opening of the receiving member 20, and okara fuel 38 and air are put together into the combustion furnace 26 in the combustion chamber 24 through the fuel supply pipe 22.

  In the combustion chamber 24, the okara fuel 38 burns well in the combustion furnace 26 by the air supplied from the external blower 42 through the air supply main pipe 44 and the air supply pipe 40. In particular, since the outside air is sent directly from the air supply pipe 40 into the combustion furnace 26, the okara fuel 38 is surely completely burned.

  In the combustion chamber 24, a large amount of heat is obtained by the okara fuel 38 combusted in the combustion furnace 26, and radiant heat is released from the side wall of the combustion chamber 24, and the combustion gas and heated air rise and rise upward. To the heat exchanger 28 arranged in A large number of heat exchange pipes 52 are arranged in the heat exchanger 28, heat exchange is performed on the surface of the heat exchange pipes 52, and the air in the heat exchange pipes 52 is warmed. Combustion gas or the like whose temperature has been lowered through heat exchange is discharged out of the greenhouse 60 through the chimney 30. Further, the air sent from the air supply main pipe 44 to the blower pipe 46 and passed through the heat exchange pipe 52 is heated by heat exchange and discharged into the greenhouse 60 from the opening of the hot air pipe 54. Thereby, the temperature in the greenhouse 60 is maintained at a constant high temperature.

  Further, the combustion cylinder 72 shown in FIG. 5 is used until the inside of the combustion chamber 24 reaches a certain high temperature before burning the okara fuel 38, and burns only liquid fuel such as food waste oil. In the combustion method, food waste liquid and air are sent from the supply pipe 27 into the combustion cylinder 72, and air is supplied into the combustion furnace 26 through the air supply pipe 40. Thereby, air is fed into the air feed pipe 74 from the air intake hole 72 a of the combustion cylinder 72, and air is injected from the opening 76 a of the blow pipe 76. Further, air is also injected from the through hole 74 a at the lower end of the air supply pipe 74, and an air flow is formed in the combustion cylinder 72. By this air flow, the waste food oil sent from the supplier 27 is formed in a mist shape, and the waste food oil burns well in the combustion cylinder 72. After the temperature of the combustion chamber 24 is appropriately increased by combustion of food waste oil, the combustion cylinder 72 and the fuel holding cylinder 34 of the combustion furnace 26 are exchanged to burn the okara fuel. In addition, as long as the okara fuel can be appropriately dispersed, the okara fuel may be introduced into the combustion cylinder 72 and burned as it is.

  The okara fuel and the okara combustion heating apparatus 10 of this embodiment make effective use of okara discharged from the tofu production process and processed as waste, and further mixed with food waste oil of food waste as fuel. It is possible to reduce waste disposal costs and effectively use them. Moreover, this okara fuel can be easily produced, has a high calorific value, can be used as an effective fuel, and can be used favorably for warming the greenhouse.

  Further, the okara combustion heating apparatus 10 according to this embodiment directly discharges high-temperature gas such as combustion gas or air from the chimney 30 by bringing it into contact with the heat exchanger 28. Heat exchange is performed well and heat efficiency is high.

  In addition, by adding rice husk and stirring, the okara fuel is more efficiently mixed and less likely to be agglomerated, is formed into a good powder form, and air sufficiently enters the gap and burns well. This also leads to effective utilization of the rice husks that have been discarded.

  The okara fuel, the okara fuel production apparatus and the okara combustion heating apparatus according to the present invention are not limited to the above embodiment, and the combustible material uses an appropriate organic waste in addition to the okara. be able to. Moreover, the structure of a combustion chamber, a combustion furnace, and a heat exchanger can be set suitably.

DESCRIPTION OF SYMBOLS 10 Okara combustion heating apparatus 12 Fuel stirring extrusion apparatus 13 Stirring blade 14 Hopper 16 Extrusion pipe 18 Delivery cylinder 19 Extrusion screw 20 Receiving member 22 Fuel supply pipe 24 Combustion chamber 26 Combustion furnace 27 Supply pipe 28 Heat exchanger 30 Chimney 34 Fuel holding Cylinder 38 Okara fuel 40 Air supply pipe 42 Blower 44 Air supply main pipe 46 Blower pipe 52 Heat exchange pipe 54 Hot air pipe 60 Greenhouse 62 Okara fuel production apparatus 72 Combustion cylinder

Claims (7)

  Okara fuel characterized in that dried okara is mixed with food waste oil, which is waste oil used in food processing, and stirred to form a powdered fuel.   The okara fuel according to claim 1, wherein the dry okara and the waste food oil are mixed in a volume ratio of 70-30: 10-3.   Okara fuel according to claim 2, wherein rice husk is mixed with the fuel.   A hollow main body into which the soy milk is squeezed, a hollow main body, a stirring blade provided in the main body for stirring the okara, a hot air inlet and a hot air outlet formed in the main body are provided, Hot air or exhaust heat obtained from a heating device is sent to the hot air inlet, and the okara is dried while stirring in the main body, and the okara fuel is burned by the heating device. Okara fuel production equipment.   A combustion furnace that burns solid fuel mainly composed of okara, a combustion chamber that houses the combustion furnace, a blower that sends combustion air and heating air in the combustion furnace, and this blower An air supply main connected to the apparatus, an air supply pipe branched from the air supply main to send air to the combustion furnace, a blow pipe connected to the air supply main, and a connection to the blow pipe A heat exchanger fixed above the combustion chamber, a heat exchange pipe provided in the heat exchanger and communicated with the blower pipe, and a hot air pipe communicated with the heat exchange pipe, Combustion gas in the combustion chamber is exhausted through the heat exchanger, and the air sent from the blower pipe exchanges heat with the heat of the combustion gas through the heat exchange pipe and is sent to the hot air pipe. Okara combustion heating device characterized by.   A fuel agitating and extruding device for mixing and supplying okara and the food waste oil is provided on the side of the combustion chamber, and the okara fuel sent from the fuel agitating and extruding device is supplied to the combustion furnace together with air. The okara combustion heating device according to claim 5. The okara combustion heating apparatus according to claim 5, wherein a supply pipe for supplying liquid fuel extends in the combustion furnace.

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