JPS6115362Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rice husk feeding device in a rice husk combustor that can effectively use hot air from combustion of rice husks as a heat source for drying.

The supplied rice husks are burned in a rice husk combustor, and the generated dust flame is separated in a dust removal cyclone to produce clean hot air, which is then stirred and mixed with the intake outside air to generate a large volume of dry hot air. In cases where drying hot air is used to achieve effective drying, the continuously supplied rice husks are rapidly placed inside the combustion furnace in order to obtain an effective high-temperature exhaust flame. It is important to completely burn the crab.

Therefore, in the case of this conventional rice husk feeding device, a means is taken to feed the rice husks into the combustion furnace main body on a swirling air flow that moves from the top to the bottom along the inner wall of the combustion furnace main body. was considered the best. However, when the rice husks are continuously fed from the top to the bottom inside the combustion furnace main body along the inner wall with the swirling air flow as described above, the inner wall is quickly scraped off by the contact friction with the hard rice husks, forming a spiral shape. A groove is formed,
This spiral groove gradually becomes deeper in proportion to the amount of fuel supplied, and finally forms a band and is supplied to the bottom of the combustion furnace main body without spreading.

Therefore, the rice husks are continuously supplied to the bottom of the combustion furnace body in the form of lumps, causing incomplete combustion of the rice husks and quickly generating an effective high-temperature dust flame. As a result, a predetermined amount of dry hot air cannot be generated, and the dry hot air has a bad odor due to incomplete combustion of the rice husks, resulting in the disadvantage that drying cannot be performed satisfactorily.

In view of the above, the present invention has been developed by installing a rice husk spout that can eject rice husk near the critical point between the swirling air flow layer and the swirling combustion flame layer formed inside the combustion furnace body, rather than in the tangential direction of the combustion furnace body. By opening and ejecting air toward the inside of the combustion furnace main body, friction between the rice husks and the inner wall is completely eliminated, and the formation of spiral grooves on the inner wall is reliably prevented, and a swirling air flow layer with different swirling speeds is created. The rice husks are heated and combusted by the swirling combustion layer and the rice husks are dispersed and supplied to the bottom of the combustion furnace body in a diffusion state, so that the rice husks are quickly completely combusted and a high-temperature exhaust flame is continuously generated. DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention aims to provide a rice husk feeding device for a rice husk combustor, and a preferred embodiment of the structure of the device according to the present invention is shown in the accompanying drawings will be described below.

In the drawing, reference numeral 1 denotes a rice husk combustor for completely combusting supplied rice husks through the supplementary action of primary combustion air and secondary air. A ventilation chamber 3 is provided through the layer 4, and a blast tube 6 of a blower 5 is connected to the ventilation chamber 3, so that the generated primary combustion air is uniformly distributed from the ventilation chamber 3 through the breathable heat storage layer 4. There is a rice husk spout 8 of an air conveying type rice husk supply device 7 which jets the rice husks into the combustion furnace main body 2 and also jets and supplies rice husks to a part of the inner wall 2a at the approximately central height position of the combustion furnace main body 2 at any time by air conveyance. is opened. A dust flame flow passage 9 is opened in the upper part of the combustion furnace main body 2, and an outer cylinder 10 is installed around the combustion furnace main body 2 at an appropriate interval to connect the combustion furnace main body 2 and the outer cylinder 10. An air preheating chamber 11 is formed between the air preheating chamber 11, and a blower pipe 13 of a blower 12 is connected to an appropriate position of the air preheating chamber 11.
A has a plurality of blowholes 1 communicating with the air preheating chamber 11.
4 in multiple stages and opening in the tangential direction,
The heated secondary air for combustion is ejected from the jet port 14 in the tangential direction along the inner wall 2a, and the inner wall 2a is
This creates a swirling air flow layer A that moves from the top to the bottom along the swirling direction, and when rice husks are burned by this swirling air flow layer A, dust is removed from the inside of the swirling air flow layer A from the bottom. It is configured to generate a swirling combustion flame layer B that moves toward the flame flow passage 9 while swirling.

Therefore, the above-mentioned rice husk jetting port 8 is arranged in the direction of the combustion furnace main body 2 rather than in the tangential direction of the combustion furnace main body 2 so that the rice husks can be ejected near the criticality between the swirling air flow layer A and the swirling combustion flame layer B. The opening is directed inward.

Reference numeral 15 denotes a depressurization relaxation chamber provided in the upper part of the combustion furnace main body 2, and the depressurization relaxation chamber 15 is connected to the inside of the combustion furnace main body 2 via the exhaust dust flame flow passage 9. The pressure of the dust flame that has been spouted out with increased pressure is reduced and the pressure is reduced, allowing it to stagnate and stir and mix with the inhaled outside air to generate hot dust air at an appropriate temperature.

Therefore, an intake cylinder 16 is open-connected to the upper part of the decompression relaxation chamber 15, and an exhaust hot air suction cylinder equipped with a suction exhaust fan 17 is provided on one side of the suction cylinder 16 to bring the inside of the decompression relaxation chamber 15 into a negative pressure state. The base end side of 18 is connected through an open connection. The discharge side of the suction/exhaust fan 17 is connected to a device for cleaning the hot dust air sucked into the hot dust suction tube 18 and converting it into hot air for drying at an appropriate temperature.

19 is an ash removal device provided at the bottom of the combustion furnace main body 1, and 20 is a stirring rake that rotates slowly on the air-permeable heat storage layer 4.

Next, the operation of the present invention will be explained.

Now, if an appropriate amount of rice husks are ejected from the rice husks outlet 8 into the combustion furnace main body 2 using the rice husks supply device 7, the rice husks will be deposited on the air-permeable heat storage layer 4. Therefore, when the accumulated rice husks are ignited, the blower 5 is operated to uniformly blow primary air for combustion from the ventilation chamber 3 through the breathable heat storage layer 4 into the combustion furnace main body 2, so that the rice husks are replenished and burned. Ru. When the rice husks are burned in this way and a "bonfire" is formed on the breathable heat storage layer 4, the blower 12 is operated to send air into the air preheating chamber 11 to create secondary combustion air. is emitted from the plurality of blowholes 14 along the inner wall 2a so as to swirl from the top toward the bottom. Then, a swirling air flow layer A that moves downward along the inner wall 2a is formed inside the combustion furnace main body 2, and this swirling air flow layer A collides with the permeable heat storage layer 4 and reverses, and then burns the rice husks. While promoting the combustion flame, the flame is raised while swirling upward from the bottom inside the swirling air flow layer A to form a swirling combustion flame layer B with a high swirling speed inside the swirling air flow layer A. The exhaust dust flame is vigorously ejected from the exhaust flame flow path 9 into the decompression relaxation chamber 15.

Therefore, swirling air flow layers A with different swirling speeds
The rice husks ejected from the rice husk jetting port 8 toward the critical vicinity of the swirling combustion flame layer B and the swirling combustion flame layer B are quickly diffused by the swirling air flow layer A moving downward and the swirling combustion flame layer B moving upward. As the rice husks fall under their own weight, some of the rice husks are heated during the fall, and some of the rice husks are burned.

Therefore, as the combustion of rice husks progresses, an appropriate amount of rice husks are ejected from the rice husk spout 8, and all of these rice husks are widely diffused inside the combustion furnace main body 2, heated and burned, and are deposited on the air-permeable heat storage layer 4. As it falls and swirls, it is replenished with primary and secondary air for combustion and is successfully and completely combusted.At the same time, due to the promotion of combustion, the combustion secondary air in the air preheating chamber 11 gradually becomes warm air, which further accelerates the combustion. The combustion is assisted and the high temperature exhaust dust flame is ejected into the decompression relaxation chamber 15. When the exhaust dust flame is blown out into the decompression relaxation chamber 15 in this way, the suction exhaust fan 17 is operated to make the inside of the decompression relaxation chamber 15 into a negative pressure state, and at the same time, the jetting pressure of the exhaust dust flame that is vigorously blown out is is retained while reducing the pressure,
The outside air and exhaust dust flame taken in from the suction cylinder 16 are stirred and mixed in the decompression relaxation chamber 15 to generate a large amount of hot exhaust air at an appropriate temperature, which is sucked into the hot dust air suction cylinder 18. The purified dry hot air is used as a drying heat source.

In short, the present invention moves the rice husks along the inner wall 2a of the combustion furnace main body 2 from the top to the bottom while swirling, and the inside of the swirling air flow layer A moves upward from the bottom. The rice husk spout 8, which is capable of ejecting rice husks near the critical point with the swirling combustion flame layer B that moves while swirling toward Since the opening is opened, the supplied rice husks are quickly diffused and fallen by the swirling air flow layer A and the swirling combustion flame layer B, which have different swirling speeds and transfer directions, forming spiral grooves etc. on the inner wall 2a of the combustion furnace main body 2. It is possible to completely eliminate the occurrence of early damage to the combustion furnace main body 2 and incomplete combustion caused by this.
Part of the dispersed rice husks is heated while falling, and the other part is burned, further promoting the combustion of the rice husks and creating a continuous stream of high-temperature dust flames, resulting in a large air volume. It has the effect of being able to supply dry hot air.

[Brief explanation of the drawing]

The drawings show one embodiment of the device according to the present invention, in which FIG. 1 is a front view with main parts cut away, and FIG. 2 is a plan cross-section of FIG. 1. 1...Rice husk combustion machine, 2...Combustion furnace main body, 2a...
...Inner wall thereof, 8... Rice husk spout, A... swirling air flow layer, B... swirling combustion flame layer.

Claims (1)

[Scope of utility model registration request] The combustion furnace body consists of a swirling air flow layer that swirls and moves from the top to the bottom along the inner wall of the combustion furnace body, and a swirling combustion flame layer that swirls and moves from the bottom upwards inside the swirling air flow layer. A rice husk jetting port capable of ejecting rice husk near the critical point between the swirling air flow layer and the swirling combustion flame layer is directed inside the combustion furnace body rather than in the tangential direction of the combustion furnace body. A rice husk feeding device in a rice husk combustor, characterized in that the rice husk combustor has an opening.