JPS6367082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion furnace that uses granular materials such as rice husk sawdust as fuel.

The purpose is to provide a combustion furnace that can automatically and continuously burn particulate matter and extract high-temperature combustion exhaust that does not contain solids, and to make the furnace compact.

Various types of rice husk phosphorizing furnaces have been proposed, including a rice husk pressure feeding device arranged upward from the bottom of the furnace 1a, that is, along the vertical axis of the furnace 1a, to supply the rice husks into the furnace 1a shown in FIG. What is done by A.
In order to prevent the spread of fire from the rice husk combustion part B, which is located at the upper end of this pressure feeding device A, it had to be designed to be quite long in terms of the pumping speed, and as a result, the vertical axis (height) of the combustion furnace was large. It becomes a thing.

Therefore, in the present invention, we have made particular efforts to reduce the height of this combustion furnace, and succeeded by making the combustion cylinder annular and connecting a granular material pumping device to it from the tangential direction.

The present invention will be explained below based on illustrated embodiments.

In FIG. 2, the combustion furnace 1 generally consists of a bottomed cylindrical outer cylinder 2, an annular plate 3 that divides the interior of the outer cylinder into upper and lower halves, and an annular combustion cylinder 4 arranged inside the outer cylinder. The outer cylinder 2 has a combustion exhaust port 5 at the top, and an air supply port 6 in the peripheral wall below the annular plate 3. The upper part of the inside of the outer cylinder 2 also communicates with a dust exhaust pipe 9 that projects from the peripheral wall of the outer cylinder 2 in a tangential direction through a dust exhaust port 20 . The annular plate 3 has a large number of evenly spaced holes 10, as shown in FIG.

The annular combustion cylinder 4 is arranged in the center of the annular plate 3 so that the upper part is above this plate 3 and the lower part is below this plate 3. A granular material pumping device 1 is formed with an annular bottomed fuel chamber 12 and is provided with a screw conveyor or the like that penetrates an outer cylinder 2 from the outside of a combustion furnace 1.
3 is laterally connected to the lower outer circumferential wall of the annular combustion tube 4 in a tangential direction thereof.

The supply cylinder 11 has a cylindrical shape with an open bottom and a top wall 1.
4 and its peripheral wall 15 are provided with a large number of holes 16.

Inside the fuel chamber 12, a helical body 17 is provided for one rotation along a spiral that gently twists upward starting from the connection with the particulate matter pumping device 13. This spiral body 17 is a guide plate that assists the upward movement of the granules, and one or several pieces are arranged along the spiral.

The holes 10 in the annular plate 3 do not penetrate perpendicularly to the plate surface as shown in FIG. It is arranged to create an airflow that swirls in a certain direction within the air.

Note that 18 is a baffle plate for dust removal provided directly below the combustion exhaust port 5, and 19 and 25 are dampers for adjusting air volume provided at the lower portions of the air supply port 6 and the supply cylinder 11. 22 is a cooling chamber formed inside the side wall and top wall of the outer cylinder 2, which communicates with the air supply port 6 and the combustion exhaust port 5, introduces cooling air from the air supply port 6, and transfers it to the combustion exhaust port 5. to be discharged.

In the above configuration, now the granular material pressure feeding device 13
When the fuel chamber 12 is driven to supply particulate matter such as rice husks to the annular combustion tube 4, the rice husks fill the fuel chamber 12. Next, when the rice husks in the upper part of the fuel chamber 12 are ignited and air is introduced from the air supply port 6, the air flows from the lower space of the outer cylinder 2 divided by the annular plate 3 into the annular combustion cylinder 4 as shown in FIG. The gas flows into the combustion chamber 24 through the holes 21 and the space between the rice husks and burns the rice husks, and at the same time, gas containing combustible components is sent into the combustion chamber 24 from the holes 16 of the feed cylinder 11. Furthermore, air escapes to the secondary combustion chamber 24 through the hole 10 in the annular plate 3 and the hole 16 in the feed cylinder 11, so that the rice husks being burned in the upper part of the fuel chamber 12 are reduced in weight by combustion, and the surrounding gas that has become high in temperature is The air rises up and rides the swirling airflow in the secondary combustion chamber 24 of the outer cylinder 2, which causes a swirling component of the air supplied from the holes 10, and is secondarily combusted.

If the granular material pumping device 13 continues to operate, rice husks are supplied into the fuel chamber 12 from below, and the combustion of the rice husks continues in the upper part.

Now, the high temperature gas swirling in the upper space of the outer cylinder 2 is taken out from the upper exhaust port 5 for a predetermined purpose such as drying grains or heating a greenhouse, but before that, the solids in the swirling airflow ( Cinders, etc.) are discharged from the exhaust pipe 9 to the outside of the furnace through the dust exhaust port 20 while rotating inside the outer cylinder 2 due to centrifugal action. Further, the baffle plate 18 prevents solid matter in the airflow from directly jumping into the exhaust port 5.

With the above configuration and operation, the present invention has the following effects.

Since the granular material pumping device is placed on the side, the height of the combustion furnace can be reduced, making handling convenient.

The combustion tube is annular, the particulate matter pumping device is connected eccentrically from the tangential direction, and the bottom surface of the combustion tube is set at the bottom of the connection part with the particulate matter pumping device,
Because it is formed in a spiral upward slope, unlike the case where the pumping device is simply connected horizontally as described above, the fuel is not pressed against the side wall of the fuel chamber and accumulates, and it is possible to use a vertical transfer device. You can move upwards smoothly without using the .

It is possible to continuously burn particulate matter, and also to obtain clean exhaust gas that is not mixed with solid matter, and it is possible to provide an economical combustion furnace as a heat source for dryers, greenhouses, etc.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of a previous granular combustion furnace;
FIG. 2 is a longitudinal sectional view of an embodiment of the present invention, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG.
A perspective view of the main part same as the above. 1... Combustion furnace, 2... Outer cylinder, 3... Annular plate, 4
... Annular combustion tube, 5 ... Combustion exhaust port, 6 ... Air supply port, 9 ... Dust exhaust pipe, 10 ... Hole, 11 ... Supply cylinder, 12 ... Fuel chamber, 13 ... Particulate matter pumping Device,
16... hole, 18... baffle plate, 20... dust exhaust port,
21... hole.

Claims (1)

[Claims] 1 The inside of the outer cylinder, which has a combustion exhaust port at the top and an air supply port at the bottom, is divided into upper and lower halves by a perforated annular plate. erected in the center of a bottomed combustion cylinder provided with a large number of holes to form a fuel chamber between the two cylinders, and arranged through the annular plate;
A particulate matter pumping device is eccentrically connected laterally to the bottom of the peripheral wall of the bottomed annular combustion cylinder along a tangent to the peripheral wall, and the bottom surface of the combustion pipe is connected to the particulate matter pumping device starting from the connection point with the particulate matter pumping device. , A granular material combustion furnace characterized by having a spiral upward slope along the outer periphery of the feed cylinder.