JPH10281430A - Solid fuel feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solid fuel feeding device for a combustion furnace in which the solid fuel is applied and its operation is carried out while its inner side being kept at a positive pressure, either not-yet ignited gas or flame in the combustion furnace is prevented from being injected out of a fuel loading inlet port when the solid fuel is fed into the combustion furnace during an operation of the combustion furnace and then the solid fuel can be additionally fed into the combustion furnace in a safe and positive manner at an optional time of the operation of the combustion furnace. SOLUTION: There are provided an upper gate 4 and a lower gate 7 for use in closing each of an upper part or a lower part of a fuel feeding section 10 of a solid fuel feeding device 1 installed at a combustion furnace 3. There are also provided an upper gate opening or closing mechanism 5 and a lower gate opening or closing mechanism 8 for use in driving to open or close either the upper gate 4 or the lower gate 7, respectively. A shield gas feeding port 9 is formed at the fuel feeding section 10 and them a shield gas feeding pipe 12 is connected to the shield gas feeding port 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion furnace which mainly uses a solid fuel (including combustible waste in the present specification) and is operated while maintaining the inside at a positive pressure. , Including an incinerator.) The present invention relates to a solid fuel injection device used by being installed in a combustion furnace for charging solid fuel into the fuel furnace.

[0002]

2. Description of the Related Art Many conventional combustion furnaces using solid fuel are operated at a negative pressure inside the combustion furnace.
During operation of the combustion furnace, even if the fuel injection door formed directly in the combustion furnace is opened to perform additional fuel injection, unburned gas and flames in the combustion furnace will be absorbed because outside air will be sucked in from the fuel injection port. There was little ejection from the fuel inlet, and it was possible to easily add additional fuel.

[0003] In recent years, as the problem of air pollution due to harmful substances released from combustion furnaces and the problem of treatment of domestic waste and industrial waste have become more serious, the incineration environment and the combustion efficiency have been improved. In order to save energy by improving the structure of the combustion furnace, combustion furnaces that are operated while maintaining the inside at a positive pressure, for example, a dry distillation gasification combustion furnace, have been frequently used. Was.

In a combustion furnace which is operated while maintaining the inside at a positive pressure, when a fuel injection door formed directly in the combustion furnace is opened to perform additional injection of solid fuel during operation of the combustion furnace. However, since unburned gas and flame in the combustion furnace erupt from the fuel inlet and it is not possible to safely add additional fuel, this type of combustion furnace burns the required amount of fuel when the combustion furnace starts operation. A so-called batch operation method has been adopted in which fuel is merely charged into the furnace and fuel is not additionally charged into the combustion furnace during operation.

[0005]

As described above, in a combustion furnace that uses a solid fuel and operates while maintaining the inside at a positive pressure, fuel is additionally charged into the combustion furnace during operation of the combustion furnace. In such a case, a fuel injection door is directly formed in a combustion furnace that has been conventionally used, and in a device or a method of opening the fuel injection door and charging fuel, unburned gas or flame in the combustion furnace is exposed to the fuel injection port. There is a problem that not only the working environment of the fuel input operation becomes poor, but also the operation involves danger because there is a possibility that the fuel will be ejected from the fuel tank. For this reason, this type of combustion furnace adopts a batch operation system in which only a required amount of fuel is charged into the combustion furnace at the start of operation of the combustion furnace, and no additional fuel is charged into the combustion furnace during operation. However, in the case of this batch operation method, there is a limit to the time during which the combustion furnace can be continuously operated because no additional fuel is charged into the combustion furnace during the operation of the combustion furnace. In this case, at the end of one operation cycle, the combustion furnace is once cooled, then the required amount of solid fuel is refilled into the combustion furnace and the operation is restarted. Therefore, the operation of the combustion furnace is an intermittent operation, and particularly in a combustion furnace that uses combustion energy for another purpose, the fluctuation of the combustion energy due to the intermittent operation of the combustion furnace has been a serious problem.
Further, in order to extend the time during which the combustion furnace can be continuously operated, it is necessary to increase the amount of solid fuel to be charged into the combustion furnace at the start of operation of the combustion furnace.
In this case, there is a problem that the size of the combustion furnace itself increases, and the equipment cost increases. In any case, in the case of this batch operation method, the time during which the combustion furnace can be continuously operated is about 10 hours at the maximum, and further continuous operation is difficult.

[0006] The present invention uses the above-mentioned conventional solid fuel,
In view of the problems of a combustion furnace that operates while maintaining the inside at a positive pressure, in a combustion furnace that uses solid fuel and operates while maintaining the inside at a positive pressure, the solid fuel When fuel is injected into the combustion furnace, solid fuel is safely and reliably burned at any time during operation of the combustion furnace by preventing unburned gas and flame in the combustion furnace from escaping from the fuel inlet. A solid fuel that enables additional injection into the furnace, thereby enabling long-term continuous operation of the combustion furnace and reducing equipment costs by appropriately reducing the size of the combustion furnace. It is intended to provide a charging device.

[0007]

In order to achieve the above object, the present invention provides a solid fuel injection device installed in a combustion furnace, comprising: an upper gate for closing an upper portion or a lower portion of a fuel input portion; A lower gate is provided, and an upper gate opening / closing mechanism and a lower gate opening / closing mechanism for opening / closing the upper gate or the lower gate are provided.

In this solid fuel injection device, the upper gate is opened by an upper gate opening / closing mechanism with the lower gate closed, and solid fuel is injected into the fuel injection section. Next, after the upper gate is closed by the upper gate opening / closing mechanism, the lower gate is opened by the lower gate opening / closing mechanism, and the solid fuel in the fuel charging section is charged into the combustion furnace. In this case, since the upper gate is closed, even if the lower gate is opened and solid fuel is injected into the combustion furnace during operation of the combustion furnace, unburned gas and flames in the combustion furnace are not removed by the upper gate. The solid fuel is prevented from being ejected to the outside of the solid fuel charging device, and the solid fuel can be safely and reliably added at any time during operation of the combustion furnace.

In this case, a shield gas inlet can be formed in the fuel inlet, and a shield gas inlet pipe can be connected to the shield gas inlet.

[0010] Thus, the solid fuel is injected into the fuel input section, the upper gate is closed by the upper gate opening / closing mechanism, then the shielding gas is introduced into the fuel input section, and the inside of the fuel input section is pressurized inside the combustion furnace. The lower gate is opened by the lower gate opening and closing mechanism, and the solid fuel in the fuel charging section is charged into the combustion furnace while maintaining a positive pressure equal to or higher than that. In this case, since the inside of the fuel inlet is maintained at a positive pressure equal to or higher than the pressure inside the combustion furnace, the lower gate is opened to burn solid fuel during operation of the combustion furnace. Unburned gas and flame in the combustion furnace do not suddenly blow out to the fuel charging section even when the furnace is charged, and the upper gate is closed. Even if the gate is opened and solid fuel is injected into the combustion furnace, unburned gas and flame in the combustion furnace are shut off by the upper gate and are prevented from squirting out of the solid fuel injection device.
At any time during the operation of the combustion furnace, the solid fuel can be additionally safely and reliably charged into the combustion furnace. next,
The lower gate is closed by the lower gate opening and closing mechanism while introducing the shielding gas into the fuel input section.After the introduction of the shield gas is stopped, the upper gate is opened and closed by the upper gate opening and closing mechanism to supply solid fuel into the fuel input section. Make it open. In this case, unburned gas in the combustion furnace, which has flowed into the fuel charging section emptied by charging the solid fuel into the combustion furnace, is replaced by the shielding gas introduced into the fuel charging section. When the upper gate is opened by the upper gate opening / closing mechanism for charging the solid fuel into the charging section, unburned gas in the combustion furnace is more reliably prevented from being ejected to the outside of the solid fuel charging apparatus. It becomes possible.

The shielding gas includes combustion exhaust gas,
A mixed gas composed of one or more of steam, an inert gas, and air can be used.

Thus, the type of the shielding gas to be introduced into the fuel charging section can be selected according to the type of the combustion furnace and the solid fuel, the mode of use, and the like. In this case, during the operation of the combustion furnace, by appropriately selecting the type of the shield gas introduced into the fuel charging section so that the unburned gas in the combustion furnace does not react with the shielding gas introduced into the fuel charging section.
Even if you open the lower gate and pour solid fuel into the combustion furnace,
The unburned gas and flame in the combustion furnace do not blow out to the fuel input section, and it is possible to more reliably prevent the unburned gas and flame in the combustion furnace from blowing out of the solid fuel charging device. It becomes possible.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a solid fuel charging device according to the present invention will be described below with reference to the drawings, taking a combustion furnace to which the solid fuel charging device is applied as an example.

The solid fuel injection device 1 is used by being installed on the upper part of a combustion furnace 3, and has a fuel injection part 10 having a fuel discharge port 2 connected to a fuel input port 14 of the combustion furnace 3.
An upper gate 4 that swings about a shaft 6 to open and close the upper part of the fuel injection unit 10 and an upper gate opening and closing mechanism that includes an arbitrary driving mechanism such as an oil / pneumatic cylinder for opening and closing the upper gate 4. The mechanism 5 is slid in the horizontal direction to move the fuel
A lower gate 7 for opening and closing the lower part of the fuel cell, a lower gate opening and closing mechanism 8 comprising an arbitrary driving mechanism such as an oil / pneumatic cylinder for driving the lower gate 7 to open and close, and a shield gas inlet formed in the fuel input unit 10 9, a shield gas air pipe 12 connected to the shield gas inlet 9, and a blower 11 and an on-off valve 13 arranged in the shield gas air pipe 12.

Next, during operation of the combustion furnace 3, which uses solid fuel and operates while maintaining the inside at a positive pressure, solid fuel is additionally charged into the combustion furnace 3. How to use will be described.

First, the upper gate 4 is opened by the upper gate opening / closing mechanism 5 with the lower gate 7 closed, and solid fuel is injected into the fuel injection section 10. In this case, since the lower gate 7 of the combustion furnace 3 is closed, unburned gas and flame in the combustion furnace 3 are shut off by the lower gate 7 and are prevented from being ejected to the fuel charging section 10.

Next, after the upper gate 4 is closed by the upper gate opening / closing mechanism 5, a shielding gas is introduced into the fuel charging section 10 from the shielding gas supply pipe 12, and the inside of the fuel charging section 10 is closed inside the combustion furnace 3. While maintaining a positive pressure equal to or higher than the pressure, the lower gate 7 is opened by the lower gate opening / closing mechanism 8 and the solid fuel in the fuel input unit 10 is supplied to the combustion furnace 3.
Put in. In this case, since the inside of the fuel charging unit 10 is maintained at a positive pressure equal to or higher than the pressure inside the combustion furnace 3, the lower gate 7 is operated during the operation of the combustion furnace 3.
Is opened and solid fuel is introduced into the combustion furnace 3, the combustion furnace 3
The unburned gas and the flame in the inside do not suddenly blow out to the fuel input section 10 and, since the upper gate 4 is closed, during operation of the combustion furnace 3, the lower gate 7 is opened and the solid fuel is opened. Is injected into the combustion furnace 3, the unburned gas and the flame in the combustion furnace 3 are shut off by the upper gate 4, and are prevented from being ejected to the outside of the solid fuel charging device 1. At any time during the operation, the solid fuel can be additionally safely and reliably charged into the combustion furnace 3.

Next, the lower gate 7 is gradually closed by the lower gate opening / closing mechanism 8 while introducing the shielding gas from the shielding gas air supply pipe 12 into the fuel input section 10,
After the unburned gas and the like in the combustion furnace 3 flowing into the fuel charging unit 10 are pushed out by the shielding gas, the on-off valve 13 is closed to stop the introduction of the shielding gas from the shielding gas air pipe 12, and the fuel charging unit The upper gate 4 is opened by the upper gate opening / closing mechanism 5 in order to charge the solid fuel into the inside 10. In this case, unburned gas and the like in the combustion furnace 3 flowing into the fuel charging unit 10 emptied by charging the solid fuel into the combustion furnace 3 are replaced by the shielding gas introduced into the fuel charging unit 10. Fuel input unit 1
When the upper gate 4 is opened by the upper gate opening / closing mechanism 5 in order to charge the solid fuel into the fuel tank 0, unburned gas and the like in the combustion furnace 3 are discharged to the outside of the solid fuel charging device 1. It is possible to reliably prevent such a situation and to maintain a favorable working environment for the fuel injection work.

Hereinafter, this series of operations is repeated a required number of times to add additional solid fuel into the combustion furnace 3. In this manner, the operation is performed using solid fuel and maintaining the inside at a positive pressure. During the operation of the combustion furnace 3, the additional operation of adding the solid fuel can be performed safely and reliably, so that the combustion furnace can be operated continuously for a long time, and the equipment cost can be reduced by appropriately reducing the size of the combustion furnace. Can be reduced.

In the present embodiment, air is introduced into the fuel inlet 10 as a shielding gas through the blower 11 and the shielding gas air pipe 12.
In addition to air, the type of the shielding gas can be appropriately selected according to the type of the combustion furnace 3 and the solid fuel, the mode of use, and the like. More specifically, one or more of combustion exhaust gas, water vapor, inert gas, and air are used so that the unburned gas in the combustion furnace 3 does not react with the shielding gas introduced into the fuel input unit 10. Can be used. In this case, a compressor, a gas cylinder, or the like can be used instead of the blower 11 as a means for introducing the shielding gas into the fuel input unit 10.

When the inside of the combustion furnace 3 is operated at a negative pressure, additional charging of solid fuel is performed by opening one of the upper gate 4 and the lower gate 7 and opening and closing the other gate. It is done by operating. At this time, the blower 11 is stopped and the on-off valve 13 is closed.

[0022]

According to the solid fuel charging apparatus of the present invention, even if the lower gate is opened and the solid fuel is injected into the combustion furnace during the operation of the combustion furnace, unburned gas and flame in the combustion furnace are reduced. , Which can be blocked by the upper gate and prevented from spouting out of the solid fuel injection device, allowing additional solid fuel to be safely and reliably injected into the combustion furnace at any time during operation of the combustion furnace Accordingly, the combustion furnace can be operated continuously for a long time, and the cost of the facility can be reduced because the combustion furnace can be appropriately downsized.

Further, by forming a shield gas inlet in the fuel inlet and connecting a shield gas air pipe to the shield gas inlet, the inside of the fuel inlet is equal to the internal pressure of the combustion furnace. Even if the lower gate is opened and the solid fuel is injected into the combustion furnace during operation of the combustion furnace, unburned gas and flame in the combustion furnace will be maintained at a higher positive pressure. Since the upper gate is closed and the lower gate is opened during the operation of the combustion furnace and the solid fuel is injected into the combustion furnace, it does not suddenly squirt into the charging section. Unburned gases and flames are blocked by the upper gate, preventing them from escaping to the outside of the solid fuel injection device, and allowing solid fuel to be safely and securely injected into the combustion furnace at any time during operation of the combustion furnace. It is possible to add more.
In addition, since unburned gas in the combustion furnace, which has flowed into the fuel charging unit emptied by charging the solid fuel into the combustion furnace, is replaced by the shielding gas introduced into the fuel charging unit, the fuel injection When the upper gate is opened by the upper gate opening / closing mechanism to supply solid fuel into the section, unburned gas in the combustion furnace, etc., is more reliably prevented from being ejected to the outside of the solid fuel charging device, It is possible to maintain a good working environment for the fuel injection work.

In addition, by using one or more of a combustion exhaust gas, water vapor, an inert gas, and air as a shield gas, the type of combustion furnace and solid fuel can be improved.
The type of shielding gas introduced into the fuel input section can be selected according to the mode of use, etc., so that the unburned gas in the combustion furnace does not react with the shielding gas introduced into the fuel input section. By appropriately selecting the type of shielding gas to be introduced into the section, even if the lower gate is opened and solid fuel is introduced into the combustion furnace during operation of the combustion furnace, unburned gas and flame in the combustion furnace are It is possible to more reliably prevent the unburned gas and the flame in the combustion furnace from being ejected to the outside of the solid fuel injector without being ejected to the fuel injection section.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a combustion furnace to which a solid fuel charging device of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solid fuel input device 2 Fuel outlet 3 Combustion furnace 4 Upper gate 5 Upper gate opening / closing mechanism 6 axis 7 Lower gate 8 Lower gate opening / closing mechanism 9 Shield gas inlet 10 Fuel input section 11 Blower 12 Shield gas air pipe 13 Opening / closing valve 14 Fuel inlet

Claims (3)

[Claims] 1. A solid fuel charging device (1) installed in a combustion furnace (3), wherein an upper gate (4) and a lower gate (7) for closing an upper portion or a lower portion of a fuel charging portion (10) are provided. And a lower gate opening and closing mechanism (8) for opening and closing the upper gate (4) or the lower gate (7). 2. A shield gas inlet (9) is formed in the fuel inlet (10), and a shield gas inlet pipe (12) is connected to the shield gas inlet (9). The solid fuel input device as described in the above. 3. Shielding gas includes combustion exhaust gas, water vapor,
3. The solid fuel input device according to claim 2, wherein a mixed gas comprising one or more of an inert gas and air is used.