JP3865030B2 - Grain drying equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grain drying apparatus for drying a grain by heating with irradiation of far infrared rays and ventilation of heated air.
[0002]
[Prior art]
The upper part of the dryer body has a grain storage tank, the middle part has a ventilation drying section, the lower stage has a grain extraction tank, and the grain stored in the grain storage tank is a ventilation drying section, a grain extraction tank, a grain storage tank A grain dryer that ventilates and drys in the ventilation drying section while circulating and flowing in the route of No. 9-113140 is described in Japanese Patent Application Laid-Open No. 9-113140. In this grain dryer, the grain dryer flows down the drying passage of the ventilation drying section. By irradiating the grain with far infrared rays, drying by far infrared rays is used in combination with drying by ventilation.
[0003]
[Problems to be solved by the invention]
In the grain dryer described in the above-mentioned JP-A-9-113140, the burner combustion exhaust hot air provided in the far-infrared radiator is introduced into the hot air chamber as it is to produce dry hot air. The waste of heat use is eliminated, and the thermal efficiency is improved.
[0004]
However, if the combustion exhaust hot air discharged from the far-infrared radiator is directly introduced into the hot air chamber as a heat source for the dry hot air, the heat efficiency is improved, but the dry hot air contains a large amount of combustion exhaust, so the dry grain contains fuel. The combustion exhaust heat from the far-infrared radiator is hot air that is hot and dry, so if you put it on the grain, it will cause cracks on the surface of the grain, It was found that the quality of dry grain was reduced.
[0005]
In order to dry the grain with high quality and efficiently in a relatively short time, a so-called friendly method has been proposed in which moisture is transferred from the inside of the grain to the surface, and the moisture on the surface is diffused by ventilation. Irradiating the grain with far infrared rays is very effective in warming the grain from the inside and transferring moisture to the surface. And when moisture moves to the surface of the grain, it is possible to dissipate the moisture just by exposing it to a relatively low temperature wind. Keeping the humidity close to the outside air without being too dry is effective in preventing the surface from being dried excessively and preventing cracking.
[0006]
Therefore, the present invention heats the inside of the grain by irradiation with far infrared rays to transfer moisture to the surface, and evaporates the moisture from the surface of the grain by ventilating the surface of the grain to dry the grain It is a grain drying device, provided with a far-infrared radiator provided with a burner as a heat source for drying at a part where the grain flows in a granular or thin layer, and combustion exhaust heat exhausted from this far-infrared radiator And an external air heat exchanger are provided in a suction air passage for sucking and circulating the outside air through the fluidized bed of grains, and the heated outside air is sucked and distributed through the fluidized bed of grains . By connecting the discharge side to the suction exhaust side of the suction air passage that sucks and circulates outside air to the fluidized bed of grain, the dried grain is clean and free of combustion exhaust heat, and is too dry like combustion hot air Ventilate warm air that keeps humidity close to the outside air, with a strange odor Upon absence etc., and to provide a grain drying apparatus capable of drying without generating cracks eliminate too dry surface.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the grain drying apparatus according to claim 1 of the present invention warms the interior of the grain by irradiation with far infrared rays, transfers moisture to the surface, and ventilates the surface of the grain. A grain drying apparatus for evaporating moisture from the surface of a grain to dry the grain, and a far-infrared radiator provided with a burner as a heat source for drying at a part where the grain flows in a granular or thin layer A heat exchanger between the combustion exhaust heat exhausted from the far-infrared radiator and the outside air is provided in a suction air passage for sucking and circulating the outside air through the fluidized bed of the grain, and the fluidized bed of the grain is heated. The outside air is structured to be sucked and circulated , and the discharge side of the heat exchanger is connected to the suction and exhaust side of the suction air passage for sucking and flowing the outside air to the fluidized bed of grains .
[0008]
In the grain drying apparatus according to claim 2 of the present invention, in the configuration of claim 1, the heat exchanger between the combustion exhaust hot air discharged from the far-infrared radiator and the outside air is a heat exchange between the combustion exhaust hot air and the outside air. A ratio control function is provided.
[0009]
The grain drying apparatus according to claim 3 of the present invention includes a grain storage tank in the upper stage of the dryer body, a ventilation drying unit in the middle stage, and a grain take-out tank in the lower stage, and the grain stored in the grain storage tank. In the grain drying device that dries while circulating and flowing in the route of the ventilation drying unit, the grain extraction tank, and the grain storage tank, the grain that flows down in a granular or thin layer from the ventilation drying unit in the grain extraction tank A far-infrared radiator that irradiates far-infrared rays is provided, and this far-infrared radiator is provided with a burner that serves as a heat source for drying. A heat exchanger for the combustion exhaust heat and the outside air is provided so that the heated outside air is sucked and distributed to the grain layer flowing down the ventilation drying section, and the discharge side of the heat exchanger is connected to the fluidized bed of the grain JP that connects the outside air to the suction outlet side of the suction air passage for sucking flow to It is an.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view showing a part of a grain drying apparatus according to the first embodiment of the present invention in a broken state, FIG. 2 is a plan sectional view of the main part of FIG. 1, and FIG. FIG. 4 is a perspective view showing a part of the grain drying apparatus according to the embodiment of the present invention in a broken state, FIG. 4 is a longitudinal front view of the grain drying apparatus according to the third embodiment of the present invention, and FIG. It is sectional drawing.
[0011]
1 and 2, reference numeral 1 denotes a dryer body, in which an upper part of the dryer body 1 is a grain storage tank 2, an intermediate stage is a ventilation drying unit 3, and a lower stage is a grain take-out tank 4. Each is provided. In the lower part of the grain take-out tank 4, a grain carry-out conveyor 5 is provided over the entire length in the front-rear direction, and an elevator (not shown) is installed between the grain carry-out conveyor 5 and the upper conveyor (not shown) in the grain storage tank 2. (Not shown in the figure), and through the grain unloading conveyor 5, the elevator and the upper conveyor, the path of the grain storage tank 2, the ventilation drying unit 3, the grain extraction tank 4, and the grain storage tank 2 It is comprised so that a grain may be circulated.
[0012]
The ventilation drying section 3 has a plurality of drying passages 6 formed by ventilation walls. A hot air supply drum constituting the drying passage 6 communicates with a hot air supply chamber 7, and an exhaust wind drum is an exhaust air chamber 8. The exhaust air chamber 8 is provided with a suction blower 9.
[0013]
The grain take-out tank 4 is formed by being surrounded by a drifting grain board 10 and both side walls 11 that are inclined from the upper side of the grain take-out tank 4 to the conveying trough of the grain carry-out conveyor 5.
[0014]
A far-infrared radiator 12 is disposed in the grain take-out tank 4, and the far-infrared radiator 12 has a cylindrical shape extending over the entire length of the grain take-out tank 4 in the front-rear direction. The far-infrared rays emitted from the far-infrared radiator 12 are drawn out from the drying passage 6 of the ventilation drying unit 3 by the rotation of the feeding roll 13, and the grains flow down on the surface of the drifted grain plate 10 in a granular or thin layer form. Irradiated to the kernel. At one end of the far-infrared radiator 12, a flame heat radiation cylinder 15 of a gun-type burner 14 faces the axis, and an exhaust cylinder 16 is connected to the other end of the far-infrared radiator 12 at the axis. The exhaust tube 16 is connected to a heat exchanger 17 provided in the hot air supply chamber 7, and the discharge side of the heat exchanger 17 is opened in the exhaust air chamber 8. The heat exchanger 17 exchanges heat between the exhaust heat from the far-infrared radiator 12 and the outside air sucked by the suction action of the suction blower 9.
[0015]
The burner 14 provided in the far-infrared radiator 12 satisfies a heat source required for drying, that is, a total heat amount for generating far-infrared radiation and hot air. The heat exchanger 17 has a function of controlling a heat exchange ratio between exhaust heat air and outside air.
[0016]
In the second embodiment according to the present invention shown in FIG. 3, the discharge side of the heat exchanger 17 is connected to the intake side of the burner 14 by a communication duct 18. According to this configuration, since the combustion hot air circulates in the annular path of the burner 14, the far-infrared radiator 12, the exhaust pipe 16, the heat exchanger 17, the communication duct 18, and the burner 14, the thermal efficiency is improved. Other configurations are the same as those shown in FIGS. 1 and 2, and the same components are denoted by the same reference numerals to avoid redundant description.
[0017]
In the third embodiment of the present invention shown in FIGS. 4 and 5, an extension duct 19 is connected to the exhaust side of the heat exchanger 17, and this extension duct 19 is passed through the exhaust duct to the exhaust chamber 8. Open. Therefore, according to this configuration, exhaust heat from the far-infrared radiator 12 is directly guided to the exhaust chamber 8 and discharged by the suction exhaust device 9. Other configurations are the same as those shown in FIGS. 1 and 2, and the same components are denoted by the same reference numerals to avoid redundant description.
[0019]
According to the grain drying apparatus according to the present invention, the far-infrared radiator 12 irradiates the grain to be dried with far-infrared rays, thereby heating the inside of the grains in a relatively short time and transferring moisture to the surface. In addition, moisture can be quickly evaporated from the surface of the dried grain by ventilation with respect to the surface of the dried grain, and the dried grain can be efficiently dried in a relatively short time. And the dried grain is clean and free of combustion exhaust heat, and it can be blown with warm air that keeps the humidity close to the outside air that is not too dry like combustion hot air, so there is no odor sticking etc. In addition, the surface can be dried without causing excessive drying and without causing cracks. Further, since the temperature of the hot air can be appropriately controlled by controlling the heat exchange ratio in the heat exchanger 17 without being influenced by the far-infrared irradiation amount, the far-infrared irradiation amount and temperature in the drying process can be controlled. Appropriate control of the temperature of the wind is possible, depending on conditions such as varieties and properties of dried kernels, initial moisture, and selection of the desired finished state of the dried kernels. Can be realized.
[0020]
【The invention's effect】
According to the grain drying apparatus of the present invention , the inside of the grain is heated by irradiation with far infrared rays to transfer the moisture to the surface, and the moisture is evaporated from the surface of the grain by ventilation to the surface of the grain. A grain drying device for drying grain, where a far-infrared radiator with a burner serving as a heat source for drying is provided at a part where the grain flows in a granular or thin layer, and discharged from this far-infrared radiator the heat exchanger with combustion exhaust hot air and outside air are, provided in the suction air passage for sucking flow of outside air into the fluidized bed of grains, as well as configured to suction flow warming the outside air into the fluidized bed of grains By connecting the discharge side of the heat exchanger to the suction exhaust side of the suction air passage that sucks and circulates outside air into the fluidized bed of grain, the dried grain is clean and free of combustion exhaust heat. Like warm air that keeps humidity close to the outside air , After that there is no such off-flavors of adhesion, it can be dried without causing cracks to eliminate the too dry on the surface.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a part of a grain drying apparatus according to a first embodiment of the present invention in a broken state.
FIG. 2 is a cross-sectional plan view showing a main part of FIG.
FIG. 3 is a perspective view showing a part of the grain drying apparatus according to the second embodiment of the present invention in a cutaway state.
FIG. 4 is a longitudinal front view of a grain drying apparatus according to a third embodiment of the present invention.
FIG. 5 is a plan sectional view of a grain drying apparatus according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dryer main body 2 Grain storage tank 3 Ventilation drying part 4 Grain take-out tank 5 Grain carry-out conveyor 6 Drying passage 7 Hot air supply room 8 Ventilation chamber 9 Suction blower 10 Flowing grain board 11 Both-side wall 12 Far-infrared radiator 13 Feeding roll 14 Burner 15 Flame heat radiation tube 16 Exhaust tube 17 Heat exchanger 18 Communication duct 19 Extension duct

Claims (3)

This is a grain drying device that heats the inside of a grain by irradiation with far infrared rays to transfer moisture to the surface, and evaporates moisture from the surface of the grain by ventilation to the surface of the grain to dry the grain. In addition, a far-infrared radiator with a burner serving as a heat source for drying is installed at the part where the grain flows in a granular or thin layer, and heat exchange between the combustion exhaust heat exhausted from this far-infrared radiator and the outside air And a suction air passage for sucking and circulating outside air through the fluidized bed of grain, and configured to suck and circulate heated outside air through the fluidized bed of grain, and the discharge side of the heat exchanger A grain drying apparatus characterized by being connected to a suction exhaust side of a suction air passage for sucking and circulating outside air through a fluidized bed .   2. The grain drying according to claim 1, wherein the heat exchanger between the combustion exhaust hot air and the outside air discharged from the far-infrared radiator has a function of controlling a heat exchange ratio between the combustion exhaust hot air and the outside air. apparatus. The upper part of the dryer body has a grain storage tank, the middle part has a ventilation drying section, the lower stage has a grain extraction tank, and the grain stored in the grain storage tank is a ventilation drying section, a grain extraction tank, a grain storage tank In the grain drying device that circulates and flows through the path of the above, a far-infrared radiator that irradiates far-infrared rays to the grain that flows down in a granular or thin layer from the ventilation drying unit is provided in the grain take-out tank. The far-infrared radiator is provided with a burner serving as a heat source for drying, and a heat exchanger between the exhaust heat from the far-infrared radiator and the outside air is provided in the suction air passage for sucking and circulating the outside air to the ventilation drying unit. In addition, it is configured to suck and circulate heated outside air through the grain layer flowing down the ventilation drying unit, and the suction side of the suction air passage that sucks and circulates the outside air through the fluidized bed of the grain A grain drying apparatus characterized by being connected .

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