Rice-hull charcoal production method using rotary kiln

Abstract

To provide a method of carbonizing rice-hull without emitting smoke (emitting smoke only a little) and without emitting malodor upon producing rice-hull charcoal from rice-hull.SOLUTION: Mixed gas consisting of rice-hulls and air is inserted into combustion chambers C, D present in a high temperature rotary kiln 3 from discharge holes 1, 5 of a rice-hull insertion pipe 12 beforehand. Rice-hulls are instantaneously combusted by inserting dried rice-hull charcoal into a high-temperature atmosphere. Rice-hulls combusted in a rotary kiln is accumulated in the bottom of the rotary kiln. At the same time, rice-hulls being combusted move upward by the linear action of a metal fitting 27 disposed inside a rotary kiln 28 and by a circular action inside the rotary kiln, and are dropped downward from a position of a certain height. Further, the combusting rice-hulls block the supply of oxygen while moving in the vertical direction. By continuously carrying out these actions, rice-hull charcoal is concurrently generated and cooled, whereby rice-hull charcoal is generated from rice-hulls in a state of being completely combusted, and environmentally friendly rice-hull charcoal of little malodor and little smoke is produced.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This method for producing smoked charcoal is a method of producing smoked charcoal from a state where rice husks are completely burned in a combustion furnace. That is, generally, smoked charcoal is produced by smoking, but in this method, charcoal can be produced from a state of complete combustion.

Background Art

[0002] The present invention aims at the effective utilization of resources remaining in the local agricultural environment. It seems that there is a problem in disposing of 2 million tons of rice husks generated from rice cultivation throughout the country. Regarding patent documents, although investigated, there were no documents of the same kind related to the present invention.

Disclosure of the Invention

Problems to be Solved by the Invention

[0003] In Japan, there has been charcoal burning since ancient times and various kinds of charcoal have been produced. There is a common charcoal-making technique in these charcoal productions. First, a certain combustion furnace is made, wood is put into it, and it is steamed by lighting a fire. In these methods, a large amount of smoke is discharged from the chimney due to steaming. Also, in the production of smoked charcoal from rice husks, not only smoke but also malodorous exhaust gas is emitted. The present invention aims at a method for carbonizing rice husks that does not emit smoke (a little may be emitted) and does not emit malodor in the production of smoked charcoal from rice husks.

Means for Solving the Problems

[0004] Generally, to make charcoal, a carbonization process is used. By reducing the supply of oxygen required for combustion and steaming, charcoal can be produced. Even when it comes to carbonization in the present invention, it is the carbonization of rice husks. First, the apparatus shown in FIG. 1 is used. In advance, a mixed gas of rice husks and air is inserted from the discharge holes 1 and 5 of the rice husk insertion pipe 12 into the combustion chambers C and D inside the rotating kiln 3 in a high-temperature state. When dry smoked charcoal is inserted into the high temperature, the rice husks burn instantaneously. The rice husks burned inside the rotating kiln accumulate at the bottom of the rotating kiln. At the same time, since the rotating kiln is in rotational motion, the rice husks burning due to the action of the straight metal fitting 27 installed inside the rotating kiln 28 and the circular action inside the rotating kiln rise upward and fall from a certain position to the lower part. Furthermore, although the burned rice husks complete combustion while undergoing vertical movement, the action of blocking the supply of oxygen is also carried out simultaneously while undergoing vertical movement. That is, since other rice husks fall from above the burning rice husks, the oxygen is blocked. Furthermore, due to the continuous performance of these actions, smoked charcoal is generated, and at the same time, the effect of lowering the temperature of the smoked charcoal that has just completed combustion is also carried out simultaneously. Inside the rotating kiln, due to the chimney effect of the gas, the air flows in the directions of the arrows E, F, and G. Since the temperature of the air at the bottom of the combustion chamber is low, the effect of lowering the temperature of the vertically moving smoked charcoal occurs, and thus low-temperature smoked charcoal is discharged. Due to such actions, it is not carbonization using general steaming, but smoked charcoal is generated from the complete combustion of rice husks, and it is a method of making smoked charcoal that is less malodorous, has less smoke, and is environmentally friendly.

Advantages of the Invention

[0005] Currently, the effective utilization of rice husks in local agriculture is an important issue for our country with scarce resources. However, in the conventional method of manufacturing smoked charcoal, the malodor is extremely bad, and furthermore, the smoke is in the worst state, which is also a serious issue in the problem of improving the atmospheric environment. The present invention shows effects such as solving these problems and contributing to the effective utilization of resources.

Best Mode for Carrying Out the Invention

[0006] For the rice husk charcoal manufacturing method, the location of the rice husk storage area, the installation location of this device, and further, the location and position of the rice husk charcoal storage warehouse are important. If they are separated from each other, the labor cost will increase in the production activities, and it becomes an important location condition in terms of cost-effectiveness. Also, the specific gravity of rice husks is as low as 0.1, and even when a 10-ton truck is fully loaded, it only amounts to 1 ton. Due to such a substance, it has the property that transportation is not feasible in terms of cost-effectiveness. Therefore, it is important to carry out production in the area where rice husks are generated for this rice husk charcoal manufacturing business.

Example

[0007] Figure 2 shows the production system of the rice husk charcoal manufacturing process and steps. First, the rice husks in the rice husk storage area 1 are inserted into the rice husk automatic feeder 3 using the spring-type rice husk transfer device (commonly known as the spring conveyor) 2. The inserted rice husks are sent into the rice husk burners 11, 12 in a state of being mixed with air using the air blower 19 of the feeder. At the same time, air is also sent into the rotary kiln. Using the air blower 8, it enters the air diffusion pipe 20 and is sent out widely from many holes at the same time, so that the rice husk charcoal manufacturing shown in Figure 1 is carried out. The produced rice husk charcoal is pushed out from the discharge port 13 of the rotary kiln 12 and enters the rice husk charcoal tank 14. Further, the produced rice husk charcoal enters the relatively large cyclone 17 in a mixed state of air and rice husk using the suction device 16 and via the rice husk charcoal transfer pipe 15. Further, due to the cyclone effect, the air is discharged from the upper air discharge port, and the rice husk charcoal is taken into the flexible container 18 from the rice husk charcoal intake port at the bottom. These rice husk charcoal intake devices are characterized by storing the produced rice husk charcoal in the flexible container in its original form. Generally, it is a rice husk charcoal storage method with features such as solving problems like the rice husk charcoal being destroyed by the blades of the motor and becoming powder. Next, the temperature of the rice husk charcoal produced from the rotary kiln shows around 35 degrees. When it accumulates in a container such as a flexible container, the rice husk charcoal has the potential to increase in temperature. In the above-described rice husk charcoal intake system, in the process of storing from the rice husk charcoal tank 14 into the flexible container, the temperature of the rice husk charcoal is lowered by utilizing the action of low-temperature air during the movement of the rice husk charcoal transfer pipe 15. It is a rice husk charcoal manufacturing system such as this.

Industrial Applicability

[0008] Rice husks are important resources in our country. It is said that 2 million tons of rice husks are difficult to dispose of. Heat generated from combustion is used for agricultural greenhouse heating. Furthermore, by making smoked charcoal, it can be used as a soil improver necessary for agriculture. Recently, the effective utilization of silica contained in rice husks has been developed in various fields.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Explanation of Reference Signs

Claims

1. A rice husk insertion pipe 12, 4 fixed to a combustion device 7, 16 provided with a chimney at the upper part, and an air insertion pipe 15 provided with many air holes 18 are movably installed above a plurality of rollers 19 on a rotary kiln 3, 8, 28 which are internally provided with circular plates 2, 24, 26 and a diffusion plate 27 in advance. It has a mechanical structure such as this. In advance, put rice husks into the rotary kiln 3, ignite and burn the rice husks using a little kerosene to form a high temperature state. In the rotary kiln 3, in the internal first combustion chambers C, D, with the rice husk insertion pipes 12, 4 used to mix air and rice husks, and discharged from the discharge holes 1, 5 using an air blower. Combustion occurs when air and rice husks diffuse in a dispersed state in the high temperature state. Furthermore, it is a combustion in a mixed state including the rice husks during the previous combustion. The rice husks burned in the rotary kiln accumulate at the bottom of the rotary kiln. At the same time, since the rotary kiln is rotating, the rice husks burning due to the action of the straight metal fitting 27 installed inside the rotary kiln 28 and the circular action inside the rotary kiln rise to the upper part and fall to the lower part from a certain position. Furthermore, although the burned rice husks complete combustion while undergoing vertical movement, the action of blocking the supply of oxygen is also carried out simultaneously while undergoing vertical movement. That is, since other rice husks fall from above the burning rice husks, the oxygen is blocked. Furthermore, by continuously performing these actions, smoked charcoal is generated, but at the same time, the effect of lowering the temperature of the smoked charcoal that has just completed combustion is also carried out. Inside the rotary kiln, due to the chimney effect of the gas, the air flows in the directions of the arrows E, F, G. Since the temperature of the air at the bottom of the combustion chamber is low, the effect of lowering the temperature of the smoked charcoal moving up and down occurs, and low-temperature smoked charcoal is discharged. A method for manufacturing smoked charcoal using such mechanical structures and natural actions.

2. Figure 2 shows the production system of the charcoal manufacturing process and steps. First, the rice husks in the rice husk storage yard 1 are inserted into the rice husk automatic feeder 3 using the spring-type rice husk transfer device (commonly known as the spring conveyor) 2. The inserted rice husks are fed into the rice husk burner 11 in a state of being mixed with air using the air blower 19 of the feeder. At the same time, air is also fed into the rotary kiln over a wide range using the air blower 8 and the air diffusion pipe 20, and the charcoal manufacturing shown in Figure 1 is carried out. The produced charcoal is pushed out from the discharge port 13 of the rotary kiln 12 and enters the charcoal tank 14. Further, the produced charcoal enters the relatively large cyclone 17 in a mixed state of air and charcoal using the suction device 16 and through the charcoal transfer pipe 15. Further, due to the cyclone effect, the air is discharged from the upper air discharge port, and the charcoal is taken into the flexible container 18 from the charcoal intake port at the bottom. These charcoal intake devices are characterized by storing the produced charcoal in the flexible container in its original form. Generally, it is a charcoal storage method with features such as solving problems such as the charcoal being destroyed by the blades of the motor and becoming powder. Next, the temperature of the charcoal produced from the rotary kiln shows around 35 degrees. When deposited in a container such as a flexible container, the charcoal has the potential to increase in temperature. In the above-mentioned charcoal intake system, in the process of storing the charcoal from the charcoal tank 14 into the flexible container, the temperature of the charcoal is lowered by utilizing the action of low-temperature air during the movement of the charcoal transfer pipe 15. It is a charcoal manufacturing system such as this.

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