JP2678264B2 - Waste fuel combustion plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is used as a burner for a sludge incinerator, a metal melting furnace, a boiler, etc.
As such, it relates to improvements in waste fuel combustion plants that can also be used to incinerate industrial and household waste.

[0002]

2. Description of the Related Art Various types of waste fuel combustion plants have already been proposed, but the one described in Japanese Patent Publication No. 3-27802 relating to the invention of the applicant of the present invention is An air supply pipe with a screw, an ash discharge mechanism, a blower pipe facing the flame guide path, and an automatic fuel supply mechanism are installed.

[0003]

According to this, the fuel externally supplied to the combustion chamber by the automatic fuel supply mechanism burns while being transferred by the screw and obtaining the required supply air, which is supplied from the blower pipe. It is further promoted by the blast, and the flame is accurately fed to the flame guide path. However, since the temperature inside the combustion chamber becomes too high, the wall surrounding the combustion chamber, the air supply pipe with a screw installed in the combustion chamber, the ash discharge mechanism, the blast pipe, the automatic fuel supply mechanism, etc. will be used for a short period of time. There is a drawback that it burns out in the middle, or hot air conducts and flows back through the blower pipe and the automatic fuel supply mechanism, and sometimes the stored fuel in the fuel hopper installed outside is ignited. Further, the fuel supplied to the combustion chamber has a drawback that it is transferred forward by the screw regardless of the combustion state, that is, even the insufficient combustion is carried out.

The object of the present invention is to provide a durable and long-term useable waste fuel which does not completely burn the fuel supplied to the combustion chamber but ignite the fuel stored outside. Providing a combustion plant.

[0005]

The structure of the waste fuel combustion plant of the present invention is as follows. The combustion furnace body a is formed in a fireproof structure cylinder c projectingly installed outside the upper portion of the front wall of the combustion furnace body a, and the inner end of a flame guide path c ′ communicating with a heating part of a sludge incinerator is connected to the upper stage of the combustion chamber 2. And, the top plate is opened close to it.

A rotary cylinder 3 which is located slightly below the middle stage of the combustion chamber 2 and extends horizontally between the front and rear walls of the combustion furnace body a has projections 5 for fuel agitation and air supply holes 4 radially on its outer circumference. And a water passage 8 that allows water to be cooled for cooling the rotary cylinder 3 including the projections 5 is provided in the cylinder wall, and the outer end of the water passage 8 is automatically adjusted according to a preset blowing pressure. To
The blower 7 is connected through a damper 6 that opens and closes
When the blow pressure from the machine 7 exceeds the set value, the damper 6
The air is blown into the combustion chamber 2 when it is opened, and the blowing pressure is below the set value.
The damper 6 is closed and the hot air in the combustion chamber 2 is sent.
The backflow to the wind blower 2 is prevented .

A blower pipe 11 penetratingly installed above the rear wall of the combustion furnace body a is located at the inner end of the combustion chamber 2 near the flame guide passage c'from the center of the combustion chamber 2 and the inner end opening of the flame guide passage c'is opened. And a water channel 14 that allows water to flow through the tube wall to cool the blower tube 11 and is provided at the outer end.
A damper that automatically opens and closes according to preset blowing pressure
From the blower 13 by connecting the blower 13 via
The damper 12 opens when the blast pressure exceeds the set value.
The air is blown into the combustion chamber 2, and the air pressure is below the set value.
When the damper 12 is closed, the hot air in the combustion chamber 2 is blown by the blower.
I try to prevent it from flowing back to 13.

Between the rotary cylinder 3 and the blower pipe 11, a fuel supply mechanism 15 is provided so as to extend through the upper part of the rear wall of the combustion furnace body a and the inner end delivery portion of the combustion chamber 2 is projected. 1
Waste fuel which is provided with a feed screw 20 inside a fixed tubular body 19 having an outer end receiving portion 17 located in the bottom portion of the external fuel hopper b and connected and installed above the external fuel hopper b. A blocking lid plate 24 is slidably mounted on a gate 25 provided below the carry-in device 23 by an air cylinder 26.

A plurality of combustion chambers 2 are provided at the bottom of the combustion chamber 2 in a direction orthogonal to the rotary cylinder 3, the blower pipe 11 and the fuel supply mechanism 15 and below the rotary cylinder 3 with a required space. The ash discharging mechanism 21 is horizontally arranged in a row over the entire bottom portion, and each outer end sending portion 22 thereof is projected outside the combustion furnace body a.

[0010]

The waste fuel carried into the external fuel hopper b by the waste fuel carry-in device 23 is carried by the fuel supply mechanism 15 and supplied to the combustion chamber 2. The waste fuel begins to burn when it falls from the inner end delivery portion 16 of the fuel supply mechanism 15, and further burns while being stirred by each protrusion 5 of the rotary cylinder 3. Combustion in the meantime is promoted by the air supply from each air supply hole 4, and the flame and hot air are further completely combusted by the air blown from the blower pipe 11, and are blown and sucked into the flame guide passage c '. It is forcibly guided.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in the drawings will be described in detail below.
a is a combustion furnace body, b is an external fuel hopper. In the combustion furnace body a, a combustion chamber 2 is surrounded by a refractory structure wall 1 formed by stacking refractory bricks.

Reference numeral c denotes a refractory structure cylindrical body (only one is shown in the figure) which is provided on the upper part of the front wall of the combustion furnace body a so as to project to the left and right of the combustion furnace body a. It is in the upper stage and is opened close to the top.

Reference numeral 3 denotes a rotary cylinder which is located slightly below the middle stage of the combustion chamber 2 and is horizontally installed between the front and rear walls of the combustion furnace body a. Radially, on the outer periphery thereof, air supply holes 4 and projections 5 for stirring are radially provided. Provided,
A blower 7 is connected to the outer end via a damper 6.
The air blown from the blower 7 pushes the damper 6 open and is sent to the rotary cylinder 3 and is ejected into the combustion chamber 2 through the air supply hole 4. The damper 6 is automatically closed when the blow pressure is equal to or lower than a set value, and the hot air in the combustion chamber 2 is prevented from flowing back to the blower 7 to protect the blower 7.

Reference numeral 8 denotes a water channel provided in the cylindrical wall of the rotating cylindrical body 3.
The water passage 8 is connected to a water receiving portion 9 and a water feeding portion 10 attached to the opposing outer surface of the combustion furnace body a, and cools the rotary cylinder 3 including the protrusion 5 by passing water.

11 is an upper portion of the rear wall of the combustion furnace body a,
Two blower pipes are provided so as to extend through the right and left sides, and the inner end of the blower pipe is opposed to the inner end opening of the flame guiding path c ′ at a position closer to the flame guiding path c ′ from the center of the combustion chamber 2. A blower 13 is connected to the outer end of the fan via a damper 12.

The air blown from the blower 13 pushes the damper 12 open and is sent to the blower pipe 11. From the inner end thereof, the combustion chamber 2 is blown.
Get in. The damper 12 is automatically closed when the blast pressure is equal to or lower than the set value, and the hot air in the combustion chamber 2 is blown by the blower 13.
Backflow to protect the blower 13. Reference numeral 14 denotes a water channel provided in the pipe wall of the blower pipe 11, which cools the blower pipe 11 by passing water through it.

Reference numeral 15 denotes a fuel supply mechanism which is provided so as to extend through the upper portion of the rear wall of the combustion furnace body a between the rotary cylinder 3 and the blower pipe 11, and the inner end delivery portion 16 thereof is slightly retracted from the center of the combustion chamber 2. The outer end receiving portion 17 is located at the bottom of the external fuel hopper b. In the fuel supply mechanism 15, a supply screw 20 is installed inside a fixed cylinder body 19 having a water channel 18 in the cylinder wall.

Reference numeral 21 denotes an ash discharging mechanism which is horizontally installed in a row at the bottom of the combustion chamber 2. The ash discharging mechanism 21 is installed in a direction orthogonal to the rotating cylinder 3, the blower pipe 11 and the fuel supply mechanism 15 and burns the outer end delivery part 22. It is projected outside the furnace body a.

Reference numeral 23 denotes a waste fuel carry-in device connected and installed above the external fuel hopper b, 24 denotes a shut-off cover plate slidably mounted on a gate 25 opened below the carry-in device 23, and 26 denotes It is an air cylinder that slides the blocking lid plate 24 back and forth. The carry-in of the waste fuel into the external fuel hopper b is continuously performed by the carry-in device 23 through the gate 25, and the waste fuel stored therein is further carried by the fuel supply mechanism 15 and the inner end delivery section 16 thereof. Is supplied to the combustion chamber 2.

The waste fuel begins to burn when it falls from the inner end delivery section 16, and is further burned while being agitated by each projection 5 of the rotary cylinder 3, and the combustion during that period is performed at each air supply hole. The flame and the hot air are further promoted by the air supply from No. 4 and further become a complete combustion state by the air blow from the air blow pipe 11, and are forcibly guided to the flame guide path c ′ by the air blow action and the suction action.

Due to this combustion, the temperature inside the combustion chamber 2 is 1000 ° C.
It becomes a high temperature that exceeds even. However, the rotary cylinder 3
Since the cylinder wall, including the projections 5, is cooled by the passage of water to the water passage 8 provided in the cylinder wall, it withstands the high temperature and is prevented from burning. Similarly, the blower pipe 11 is provided by the passage of water to the water channel 14, and the fixed cylinder 19 of the fuel supply mechanism 15 is connected to the water channel 18.
Each is cooled by passing water through it, and it withstands high temperatures and prevents burnout. The waste fuel supplied to the combustion chamber 2 is only agitated by the protrusions 5 of the rotary cylinder 3 and is not transferred forward by the screw. Will not be sent to the outside.

The hot air in the combustion chamber 2 ignites the filled waste fuel through the cylinder wall of the fixed cylinder 19 of the fuel supply mechanism 15, the supply screw 20, the filled waste fuel itself, and the like. It may ignite the stored waste fuel in the external fuel hopper b, and further ignite the transported waste fuel outside the gate 25. In that case, the gate 25 is preliminarily shut off. It is possible to prevent such ignition by closing the inside of the fuel tank and closing the supply of air from the outside to the external fuel hopper b.

When the blow pressure from the blowers 7 and 13 is less than the set value, the dampers 6 and 12 are automatically closed by their own weight or the like to prevent the hot air in the combustion chamber 2 from flowing backward, , 13 has been described above. In the above description, the first ignition of the waste fuel supplied from the inner end delivery portion 16 of the fuel supply mechanism 15 to the combustion chamber 2 is not illustrated while the exhaust valve (not shown) is opened to exhaust. It is done through the ignition window.

[0024]

As is apparent from the above description,
The waste fuel combustion apparatus of the present invention has the following effects.

Fuel such as industrial waste or household waste is
The waste fuel carry-in device once carries it into the external fuel hopper, and then it is carried by the fuel supply mechanism and supplied to the combustion chamber. The waste fuel burns more than when it falls from the inner end delivery part of the fuel supply mechanism. At the beginning, it burns further while being stirred by each protrusion of the rotary cylinder. Combustion in the meantime is promoted by the air supply from each air supply hole, and the flame and hot air are further completely combusted by the air blown from the blower tube, and are forcibly guided to the flame guide path by the air blowing action and the suction action. .

This combustion raises the temperature inside the combustion chamber,
Since the rotary cylinder, the blower pipe, and the fuel supply mechanism all have a water-cooled structure, they are each cooled by passing water,
Can withstand high temperatures and prevent burning.

By closing the gate of the external fuel hopper with the shut-off cover plate and cutting off the supply of air from the outside to the external fuel hopper, the hot air in the combustion chamber is supplied to the cylinder wall of the fixed cylinder of the fuel supply mechanism. Conducting through the screw, the filled waste fuel itself, etc. does not cause ignition of the filled waste fuel or ignition of the stored waste fuel of the external fuel hopper. Does not ignite transported waste fuel.

The waste fuel supplied to the combustion chamber is only agitated by the protrusions of the rotary cylinder, and is not transferred forward by the screw. Therefore, the waste fuel is discharged outside with insufficient combustion. There is no such thing. A plurality of ash discharging mechanisms are provided at the bottom of the combustion chamber in a direction orthogonal to the rotary cylinder, the blower pipe and the fuel supply mechanism, and below the rotary cylinder at required intervals. As the ash is piled up horizontally over the entire bottom area, ash accumulates on it, the ash in the lower layer is transferred and discharged to the outside of the combustion furnace body, and the ash accumulated on the ash discharge mechanism is burned. It helps to keep the bottom of the chamber warm, and also helps to burn the fuel during combustion.

[Brief description of the drawings]

1 is a schematic vertical sectional view of an embodiment of a waste fuel combustion plant of the present invention.

FIG. 2 is a schematic vertical sectional view of the combustion furnace body of the above.

FIG. 3 is a schematic vertical sectional view of the same combustion furnace body as above.

[Explanation of symbols]

 a combustion furnace body b external fuel hopper c fire-resistant structure cylinder c'flame guideway 1 fire-resistant structure wall 2 combustion chamber 3 rotating cylinder body 4 air supply holes 5 projections 6 damper 7 blower 8 water channel 9 water receiving section 10 water feeding section 11 blower tube 12 Damper 13 Blower 14 Water Channel 15 Fuel Supply Mechanism 16 Inner End Sending Section 17 Outer End Receiving Section 18 Water Channel 19 Fixed Cylindrical Body 20 Supply Screw 21 Ash Discharging Mechanism 22 Outer End Sending Section 23 Waste Fuel Carrying Device 24 Gate 25 Blocking Cover Plate 26 air cylinders

Claims (1)

(57) [Claims] 1. A combustion furnace body is formed inside a refractory structure projectingly installed outside the upper part of the front wall of the combustion furnace body, and an inner end of a flame guide path communicating with a heating part of a sludge incinerator is provided at an upper stage of the combustion chamber. It must be open at a position close to the top plate, and a rotary cylinder that is positioned slightly below the middle stage of the combustion chamber and is laid horizontally between the front and rear walls of the combustion furnace body for fuel agitation on its outer periphery. The projections and the air supply holes are respectively provided radially, and a water passage that allows water to cool the rotary cylinder including the projections is provided in the cylinder wall, and the outer end is preset.
Via the damper 6 that automatically opens and closes according to the blowing pressure
The blower 7 is connected, and the blow pressure from the blower 7 is the set value.
When it exceeds, the damper 6 opens and the air is blown into the combustion chamber 2,
When the blow pressure is below the set value, the damper 6 is closed.
It also prevents the hot air in the combustion chamber 2 from flowing back to the blower 2.
The blower pipe penetrating the upper part of the rear wall of the combustion furnace body has an inner end facing the inner end opening of the flame guide passage at a position closer to the flame guide passage from the center of the combustion chamber. In addition, a water channel that allows water to cool the blower pipe is provided in the wall of the pipe, and the outer end is provided with a self- contained water flow according to a preset blower pressure.
Connect the blower 13 via the damper 12 that opens and closes dynamically
However, when the blow pressure from the blower 13 exceeds the set value
The damper 12 opens and the air is blown into the combustion chamber 2, and the blowing pressure
When the force is below the set value, the damper 12 closes and burns.
Prevent the hot air in the chamber 2 from flowing back to the blower 13.
That is, between the rotary cylinder and the blower pipe, a fuel supply mechanism that penetrates the upper part of the rear wall of the combustion furnace body and projects the inner end delivery part into the combustion chamber is fixed with a water channel on the cylinder wall. With the supply screw inside the cylinder, the outer end receiving portion is located in the bottom of the external fuel hopper, and a gate provided below the waste fuel carry-in device connected and installed above the external fuel hopper, The shut-off lid plate is slidably installed horizontally by an air cylinder, and the bottom of the combustion chamber is in the direction orthogonal to the rotary cylinder, the blower pipe and the fuel supply mechanism, and the rotary cylinder. A plurality of ash discharge mechanisms are arranged in a row under the entire area of the bottom of the combustion furnace body at predetermined intervals, and each of the outer end delivery parts thereof is projected outside the combustion furnace body. plant.