JP2002303410A - Waste gasifying melting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste gasifying melting device capable of keeping a pressure in a gasifying furnace at a negative pressure regardless of an amount of gas generated in a gasifying furnace. SOLUTION: By providing a bypass line 35 through which gas 22 generated in the gasifying furnace 3 flows in a melting furnace outlet line 25 by causing the gas to bypass a melting furnace 5, a part of gas in the gasifying furnace is hardly reduced in a pressure and can flow in a melt furnace outlet line 25, where a pressure is comparatively low, not through the melting furnace 5, where a pressure is comparatively high. This constitution can reduce a pressure in the gasifying furnace 3 compared with conventional constitution wherein after the melting furnace 5 is decreased in a pressure, the gasifying furnace 3 is decreased in a pressure, and can keep the interior of the gasifying furnace 3 at a negative pressure regardless of an amount of the gas 22 generated in the gasifying furnace 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste gasification and melting apparatus for pyrolyzing waste and melting ash.

[0002]

2. Description of the Related Art When general refuse, industrial waste, and the like are gasified, that is, thermally decomposed in a gasification furnace, a toxic gas may be generated. For this reason, in the transport path for transporting waste to the gasifier, the gas generated in the gasifier, in order to prevent as much as possible to be released outside the gasifier through the transport path, for example, A sealing device such as a lid or a damper that is opened when waste is put in and is closed at other times is provided. However, in this sealing device, the failure of the sealing device due to foreign matter such as metal contained in waste, for example, the failure of the damper to be stuck due to the foreign material being caught between the damper and the wall surface of the flow path occurs. A gap is provided in order to prevent this. Therefore, it is difficult to secure a completely airtight state by the sealing device so that the gas inside the gasification furnace does not leak outside.

For this reason, in a conventional waste gasification and melting apparatus, a melting furnace and an induction ventilator are sequentially placed in a gas flow path through which gas generated in the gasification furnace flows from the upstream side with respect to the gas flow. By providing a structure in which the induction ventilator sucks the gas in the gas flow path and guides it to the downstream side, the pressure inside the gasification furnace is maintained at a lower pressure than the outside of the gasification furnace, that is, a negative pressure, and gasification is performed. Gas in the furnace is prevented from being released from the gap of the sealing device to the outside of the gasification furnace.

[0004]

By the way, the kind and amount of waste supplied to the gasifier are not always constant, and the gasifier is supplied with waste which is likely to generate gas or temporarily. A large amount of waste may be supplied. In this case, the amount of gas generated in the gasifier becomes larger than usual, and the amount of gas and unburned gas supplied from the gasifier to the melting furnace located downstream of the gasifier also increases. I do. Accordingly, the amount of exhaust gas and the amount of heat generated by combustion in the melting furnace further increase, so that the pressure of the melting furnace is less likely to decrease than usual.

Therefore, in a conventional configuration in which the inside of the gasification furnace is depressurized after depressurizing the inside of the melting furnace by the induction ventilator,
Since it is difficult to reduce the pressure inside the gasification furnace and the pressure inside the gasification furnace tends to be equal to or higher than the outside, the inside of the gasification furnace may not be maintained at a negative pressure. In this case, in the conventional waste gasification and melting apparatus, in order to prevent the gas in the gasification furnace from being released to the outside, the supply of the waste is stopped or the entire waste gasification and melting apparatus is stopped. Therefore, even if the amount of gas generated in the gasification furnace is relatively large, a waste gasification and melting apparatus capable of maintaining the inside of the gasification furnace at a negative pressure regardless of the amount of generated gas is desired. I have.

An object of the present invention is to keep the pressure in a gasification furnace negative regardless of the amount of gas generated in the gasification furnace.

[0007]

SUMMARY OF THE INVENTION A waste gasification and melting apparatus according to the present invention comprises a gasification furnace for thermally decomposing waste, a gas flow path through which gas generated by the pyrolysis flows, and a gas flow path. An air ventilator that is provided in the gas flow path for inducing and flowing gas into the gas flow path, and a gas and an unburned component that is provided in a portion of the gas flow path between the gasification furnace and the induction ventilator. And a melting furnace for melting the ash, and a gas generated in the gasification furnace, bypassing the melting furnace and flowing into a portion of the gas flow path between the melting furnace and the induction ventilator. The above problem is solved by providing a road.

[0008] The waste gasification and melting apparatus of the present invention comprises:
A gasification furnace for thermally decomposing waste, a conveyance path for conveying waste to the gasification furnace, a gas flow path through which gas generated by the pyrolysis flows, and a gas flow path provided in the gas flow path A draft fan that draws gas into the gas flower, and a gas flow furnace that is provided between the gasifier and the draft fan in the gas flow path, burns gas and unburned components entrained in the gas, and reduces ash content. A melting furnace was provided for melting, and a bypass flow path was provided in which the gas flowing from the gasification furnace to the transfer path was allowed to flow into the gas flow path between the melting furnace and the induction ventilator by bypassing the melting furnace. This solves the above problem.

With such a configuration, a part of the gas generated in the gasification furnace can flow into the gas flow path between the melting furnace and the induction ventilator via the bypass flow path. That is, it is difficult to decompress a part of the gas in the gasification furnace or a part of the gas in the transfer path, and without passing through a relatively high-pressure melting furnace, a relatively low-pressure melting furnace and The gas can flow into the gas flow path between the induction ventilators. Thereby, the pressure in the gasification furnace can be reduced as compared with the conventional configuration in which the pressure in the melting furnace is reduced and then the pressure in the gasification furnace is reduced. Therefore, the inside of the gasification furnace can be maintained at a negative pressure regardless of the amount of gas generated in the gasification furnace.

[0010] Further, an on-off valve for controlling the opening and closing of the bypass flow passage according to the pressure in the gasification furnace can be provided. With such a configuration, the amount of gas flowing into the gas flow path between the melting furnace and the induction ventilator via the bypass flow path can be adjusted according to the pressure in the gasification furnace. This is preferable because the pressure in the gasification furnace can be kept in a predetermined range.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of a waste gasification and melting apparatus to which the present invention is applied will be described below with reference to FIG. FIG. 1 is a schematic sectional view showing a schematic configuration and operation of a first embodiment of a waste gasification and melting apparatus to which the present invention is applied.

As shown in FIG. 1, the configuration of the waste gasification / melting apparatus 1 of the present embodiment includes a gasification furnace 3, a melting furnace 5, a combustion chamber 9 for completely burning the exhaust gas 7, and a heat of the exhaust gas 7. It comprises a heat recovery boiler 11 to be recovered, a dust collecting device 15 for collecting dust 13 contained in the exhaust gas 7, an induction ventilator 17 for inducing the exhaust gas 7 downstream, and the like.

In the gasifier 3, waste 2 is introduced into the gasifier 3.
One end of the transport path 19 for guiding the waste 20 is connected, and the other end of the transport path 19 is connected to a supply device 21 such as a conveyor or a screw feeder for adjusting the amount of the waste 20 to be supplied. Further, the gasification furnace 3 is connected to one end of a gasification furnace outlet pipe 24 that guides the gas 22 generated in the gasification furnace 3 and the unburned char 23 to the downstream side. The other end of the pipe 24 is connected to the melting furnace 5. To the melting furnace 5, one end of a melting furnace outlet pipe 25 for guiding the exhaust gas 7 generated in the melting furnace 5 to the downstream side is connected, and the other end of the melting furnace outlet pipe 25 is connected to the combustion chamber 9. I have.
Further, one end of a bypass pipe 35 serving as a bypass flow path is connected to the gasification furnace 3, and the other end of the bypass pipe 35 is
It is connected to the melting furnace outlet line 25. Further, the gasification furnace 3 is provided with a pressure gauge 37 for detecting the pressure in the gasification furnace 3.

The combustion chamber 9 is connected to the heat recovery boiler 11 via a combustion chamber outlet pipe 26, and the heat recovery boiler 11 is connected to the dust collector 15 via a heat recovery boiler outlet pipe 28. The dust collecting device 15 is connected to the induction ventilator 17 via an induction ventilator inlet conduit 30, and the induction ventilator 17 is connected to the chimney 27 via a chimney conduit 32. Gasification furnace 3, gasification furnace outlet line 24, melting furnace 5, melting furnace outlet line 25, combustion chamber 9, combustion chamber outlet line 26, heat recovery boiler 1
1. Gas that guides the gas 22 generated in the gasification furnace 3 by the heat recovery boiler outlet line 28, the dust collector 15, the induction ventilator inlet line 30, the induction ventilator 17, the chimney line 32, and the chimney 27. A channel is formed.

The supply device 21 is provided with a supply hopper 31 for storing the waste 20. The supply device 21 adjusts the amount of the waste 20 stored in the supply hopper 31 to
9 is connected to the transport path 19 so as to be discharged. In addition, for example, a lid or a damper that is opened when the waste 20 is put into the transport path 19 and is closed when the waste 20 is put into the transport path 19 may be provided at a discharge portion of the supply device 21 that discharges the waste 20 to the transport path 19. Is provided. The sealing device 33 is provided in order to suppress the gas 22 generated in the gasification furnace 3 from being released from the supply device 21 to the outside of the gasification furnace 3 through the transport path 19 as much as possible. Gaps, play, and the like are provided in order to prevent a failure or a stop caused by a foreign substance such as metal contained in the object 20 being caught in the lid.

A damper 34 which is electrically connected to a pressure gauge 37 through a wiring 45 is provided in the induction ventilator inlet line 30. The damper 34 adjusts the flow rate of the exhaust gas 7 flowing in the induction ventilator inlet pipe 30 according to a signal from the pressure gauge 37 so that the pressure in the gasifier 3 becomes a predetermined negative pressure. On the other hand, a damper 39 which is an on-off valve is provided in the bypass pipe 35, and the damper 39
It is electrically connected to the pressure gauge 37 through the wiring 41. The damper 39 operates when the damper 34 is fully opened, and in response to a signal from the pressure gauge 37, the gasifier 3
The pressure in the bypass line 35 is adjusted so that the internal pressure becomes a predetermined negative pressure.
The flow rate of the gas 22 flowing inside is adjusted.

The waste gasification and melting apparatus 1 having such a configuration
The operation of the present invention and the features of the present invention will be described. First, when the operation is started, the induction ventilator 17 operates to suck the gas in the induction ventilator inlet conduit 30 and discharge it to the chimney conduit 32. Thereby, the pressure in the waste gasification and melting apparatus 1 is sequentially reduced from the downstream side as shown in FIG. During the operation of the waste gasification and melting apparatus 1, the pressure gauge 37 provided in the gasification furnace 3 detects the pressure in the gasification furnace 3 and sends a signal of the detected pressure to the dampers 34 and 39. send.

After the pressure in the gasification furnace 3 is reduced to a predetermined negative pressure, the operation is started, and the waste 20 stored in the supply hopper 31 is sent to the discharge part of the supply device 21 by the supply device 21. Can be The seal device 33 operates by detecting the waste 20 sent to the discharge unit by, for example, a weight or an optical sensor, and makes the discharge portion of the supply device 21 communicate with the transport path 19. Thereby, the waste 20 slides down in the transport path 19 and is injected into the gasification furnace 3. After the waste 20 is charged, the sealing device 33 shuts off the discharge portion and the transport path 19 again. On the other hand, the waste 20 charged into the gasification furnace 3 reacts with fluidized air supplied from the bottom of the gasification furnace 3 and is thermally decomposed. As the waste 20 is thermally decomposed, combustible gas 22, char 23 which is unburned carbon, and ash are generated and discharged in the gasification furnace 3.

The discharged gas 22, char 23 and ash are sent to the melting furnace 5 through the gasification furnace outlet line 24. The gas 22 and the char 23 sent to the melting furnace 5 are mixed with air for combustion in the furnace and burned. Melting furnace 5
Inside, the ash is melted by the heat generated by the combustion, and the melted ash is discharged out of the melting furnace 5 as slag (not shown). The exhaust gas 7 generated by the combustion in the melting furnace 5 flows through the melting furnace outlet pipe 25 and is sent to the combustion chamber 9. Since the operation in the melting furnace 5 is performed with a relatively low excess air ratio in order to suppress the generation of nitrogen oxides, the exhaust gas 7 discharged from the melting furnace 5 is completely burned. Unburned gas may be included. However, the unburned gas flowing into the combustion chamber 9 is completely burned in the combustion chamber 9.

The completely burned exhaust gas 7 flows through the combustion chamber outlet pipe 26 and is sent to the heat recovery boiler 11. The heat of the exhaust gas 7 sent to the heat recovery boiler 11 is recovered in the heat recovery boiler 11. The exhaust gas 7 from which heat has been recovered in the heat recovery boiler 11 passes through a heat recovery boiler outlet pipe 28, and after the dust 13 contained in the exhaust gas 7 has been removed in the dust collector 15, the induction ventilator inlet pipe It flows into 30. The exhaust gas sent into the induction ventilator inlet duct 30 is attracted, that is, sucked by the induction ventilator 17, sent to the chimney duct 32, and discharged from the chimney 27 into the atmosphere.

During operation of the waste gasification and melting apparatus 1, the damper 34 adjusts the flow rate of the induction ventilator inlet line 30 according to a signal from the pressure gauge 37. For example, the supply amount of the waste 20 supplied to the gasification furnace 3 is temporarily reduced, or the waste 20 having a composition that does not relatively generate gas is supplied. When the pressure becomes lower than the predetermined negative pressure, the damper 34 receiving the signal from the pressure gauge 37
The opening degree of the damper 34 is adjusted according to the signal to reduce the flow rate of the exhaust gas 7 flowing in the induction ventilator inlet conduit 30. As a result, the amount of the exhaust gas 7 sucked into the induction ventilator 17 is reduced, that is, it becomes difficult for the induction ventilator 17 to reduce the pressure in the gas flow path, and the pressure in the gasification furnace 3 increases to a predetermined negative pressure. become.

The waste 20 charged into the gasifier 3
When the pressure in the gasifier 3 becomes higher than a predetermined negative pressure due to a temporary increase in the supply amount of the gas or a supply of the waste 20 having a composition that generates a relatively large amount of gas, 3
The damper 34 that has received the signal from 7 adjusts the damper 34 according to the signal, and increases the flow rate of the exhaust gas 7 flowing in the induction ventilator inlet line 30. Therefore, the induced draft fan 1
The amount of the exhaust gas 7 sucked by the exhaust gas 7 increases, that is, the induction ventilator 17 easily reduces the pressure in the gas flow path, and the pressure in the gasification furnace 3 decreases to a predetermined negative pressure.

As described above, when the pressure in the gasification furnace 3 is maintained at a predetermined negative pressure by the damper 34, the damper 39 does not operate and the damper 39 is closed. However, if the supply amount of the waste 20 charged into the gasification furnace 3 further increases, the inside of the gasification furnace 3 may not be maintained at a negative pressure even though the damper 34 is fully opened.
In this case, the damper 39 is opened by receiving a signal indicating that the pressure inside the gasification furnace 3 is equal to or higher than the predetermined negative pressure from the pressure gauge 37, and the gasification furnace 3 and the melting furnace outlet pipe 25 are connected.
The pressure in the melting furnace outlet line 25 is equal to the gasification furnace outlet line 24.
Since the pressure is lower than the pressure in the melting furnace 5, the gas 22 in the gasification furnace 3 flows through the bypass pipe 35 and flows into the melting furnace outlet pipe 25.

As a result, when the pressure in the gasification furnace 3 decreases and the inside of the gasification furnace 3 becomes a predetermined negative pressure, the pressure gauge 37 outputs a signal indicating that the pressure in the gasification furnace 3 is the predetermined negative pressure. Damper 3
Call 9 Upon receiving the signal, the damper 39 closes and closes the bypass line 35. In addition, the bypass pipe 35
22 flowing into the furnace and flowing into the outlet line 25 of the melting furnace
Is guided to the combustion chamber 9 and is completely burned in the combustion chamber 9. The exhaust gas 7 generated by the combustion in the combustion chamber 9 is heat-recovered by the heat recovery boiler 11, and after the dust 13 included in the exhaust gas 7 is removed by the dust collecting device 15,
It is released to the atmosphere via a chimney 27.

As described above, in the waste gasification and melting apparatus 1 of this embodiment, when the pressure in the gasification furnace 3 rises above a predetermined negative pressure, the gasification furnace 3 and the melting furnace outlet pipe Road 2
5 is communicated by the bypass line 35, so that a part of the gas 22 generated in the gasification furnace 3 can be transferred to the melting furnace outlet line 25 having a lower internal pressure than the melting furnace 5 without passing through the melting furnace 5.
Can be flushed into. Thereby, compared with the conventional configuration in which the pressure of the melting furnace 5 is reduced and then the pressure of the gasification furnace 3 is reduced,
Even when the pressure in the melting furnace 5 is hard to be reduced and the gas 22 is hard to flow from the gasification furnace 3 into the melting furnace 5, the gas 22 in the gasification furnace 3 can be discharged to the downstream side, Furnace 3
The interior can be depressurized and maintained at a negative pressure. That is, regardless of the amount of gas generated in the gasification furnace 3, the inside of the gasification furnace 3 can be depressurized and maintained at a negative pressure.

Further, since the inside of the gasification furnace 3 can be maintained at a negative pressure by reducing the pressure, the gas 22 in the gasification furnace 3 is released to the outside of the gasification furnace 3 through the transfer path 19. Thus, the waste gasification and melting apparatus can be operated more safely. In addition, the present invention can reduce the pressure of the gasification furnace 3 in which the pressure in the melting furnace 5 is hard to be reduced and the gas 22 hardly flows into the melting furnace 5 from the gasification furnace 3. It is possible to use an induction ventilator having a relatively small ability to attract gas, such as an induction ventilator provided in a garbage incinerator not provided.

(Second Embodiment) A second embodiment of the waste gasification and melting apparatus to which the present invention is applied will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a schematic configuration and operation of a waste gasification and melting apparatus 50 to which the present invention is applied. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and the configuration and features different from those in the first embodiment will be described.

The difference between the present embodiment and the first embodiment is that, as shown in FIG. 3, instead of a bypass pipe 35 connecting the gasification furnace 3 and the melting furnace outlet pipe 25, a conveying pipe is provided. Bypass line 5 connecting line 19 and melting furnace outlet line 25
2 is provided. In the bypass conduit 52, the wiring 41
Damper 39 electrically connected to the pressure gauge 37 through the
Is provided. The damper 39 is activated when the damper 34 is fully opened, and the gas 2 flowing through the bypass pipe 52 is controlled so that the pressure in the gasification furnace 3 becomes a predetermined negative pressure.
Adjust the flow rate of 2.

The operation and features of the waste gasification and melting apparatus 50 of this embodiment having the above-described configuration will be described. The description of the operation when the operation is started and the operation when the pressure in the gasification furnace 3 is lower than the predetermined negative pressure are the same as those in the first embodiment, and a description thereof will be omitted.

During operation of the waste gasification / melting apparatus 50, the supply amount of the waste 20 supplied to the gasification furnace 3 increases, or the waste 20 having a composition that generates gas in a relatively large amount is supplied. Then, even though the damper 34 is fully open, the inside of the gasification furnace 3 cannot be maintained at a negative pressure in some cases. In this case, the pressure gauge 37 transmits to the damper 39 a signal indicating that the pressure in the gasification furnace 3 is higher than a predetermined negative pressure.
Upon receiving the signal from the pressure gauge 37, the damper 39 is opened, and the transfer path 19 and the melting furnace outlet pipe 25 are connected.
Since the pressure in the melting furnace outlet pipe 25 is lower than the pressure in the melting furnace 5, the gasification furnace outlet pipe 24, and the gasification furnace 3, the gas 22 in the transfer path 19 flows through the bypass pipe 52. Then, it flows into a melting furnace outlet line 25 between the melting furnace 5 and the combustion chamber 9. As a result, the pressure in the transport path 19 decreases, and accordingly, the pressure in the gasification furnace 3 also decreases.

Thereafter, when the pressure in the gasification furnace 3 reaches a predetermined negative pressure, the pressure gauge 37 transmits a signal to the damper 39. Upon receiving the signal, the damper 39 closes and shuts off the flow path of the bypass conduit 52. The gas 22 flowing through the bypass pipe 52 and flowing into the melting furnace outlet pipe 25 is guided to the combustion chamber 9 and is completely burned in the combustion chamber 9. The exhaust gas 7 generated by the combustion in the combustion chamber 9 is supplied to the heat recovery boiler 1.
After the heat is recovered in 1 and the dust 13 contained in the exhaust gas 7 is removed by the dust collecting device 15, the dust is discharged to the outside of the gasification furnace 3 through the induction draft fan 17 and the chimney 27.

As described above, in the waste gasification and melting apparatus 50 of the present embodiment, when the pressure in the gasification furnace 3 becomes higher than the predetermined negative pressure, the conveyance path 19 and the melting furnace outlet pipe 25
Is communicated by the bypass pipe 52, so that a part of the gas 22 generated in the gasification furnace 3 and flowing into the transfer path 19 is supplied from the inside of the melting furnace 5 without passing through the melting furnace 5 which is difficult to decompress. To the lower melting furnace outlet line 25. As a result, as compared with the conventional configuration in which the pressure in the melting furnace 5 is reduced and then the pressure in the gasification furnace 3 is reduced, the pressure in the melting furnace 5 is less likely to be reduced, and the gas 22 flows into the melting furnace 5 from the gasification furnace 3. Even if difficult, the gas 22 flowing from the gasification furnace 3 to the transfer path 19
Can be discharged downstream of the melting furnace 5, and the pressure in the gasification furnace 3 can be reduced to maintain a negative pressure. That is, regardless of the amount of gas generated in the gasification furnace 3, the pressure inside the gasification furnace 3 can be reduced to maintain a negative pressure.

Further, the gas 22 flowing from the gasification furnace 3 to the supply device 21 via the transfer path 19 can be preferentially flown into the bypass pipe 52, and the gas 22 in the gasification furnace 3
From the gasification furnace 3 via the transfer path 19 can be made less likely to be released. Further, since the gas 22 can be extracted from a position close to the supply device 21, the responsiveness is better than in the first embodiment. Therefore, the operation of the waste gasification and melting apparatus can be performed more safely.

The waste gasification and melting apparatus according to the present invention is provided with bypass pipes 35 and 52 and is provided with a gas 2 upstream of the melting furnace 5.
Since it is sufficient that the pressure of the gasification furnace 3 can be reduced by sending the gas 2 to the induction ventilator 17 without passing through the melting furnace 5, it is not limited to the first and second embodiments, and various configurations may be used. can do. For example, in the first embodiment, the bypass line 35 is connected to the gasification furnace 3, but the bypass line 35 is connected to the gasification furnace outlet line 24 and the melting furnace outlet line 25. Can be configured to communicate with each other. Further, in the first and second embodiments, control is performed to open the damper 39 when the damper 34 is fully opened and the pressure in the gasification furnace 3 becomes higher than a predetermined negative pressure. However, regardless of the damper 34, when the pressure in the gasification furnace 3 becomes higher than a predetermined negative pressure,
9 can be controlled. In the first and second embodiments, the damper 39 opens and closes so that the gas 22 flows through the bypass pipes 35 and 52 to adjust the pressure in the gasification furnace 3. For example, it is also possible to adopt a configuration in which the opening degree of the damper 39 can be adjusted according to the pressure in the gasification furnace 3.

In the present embodiment, the induction ventilator 17 is used, but instead of the fan means such as the induction ventilator 17, for example, the exhaust gas 7 in the induction ventilator inlet pipe 30 is sucked by a piston or the like. A device that feeds to the chimney line 32 can be used. When the flow rate of the exhaust gas 7 flowing in the induction ventilator inlet duct 30 can be adjusted by the induction ventilator 17, the damper 34 can be omitted. Further, a pressure gauge 37 is provided to measure the pressure in the gasification furnace 3 and electrically connected to the damper 39. In the present invention, according to the pressure in the gasification furnace 3, It is only necessary to be able to open and close the damper 39, so that not only the pressure gauge 37 but also various means can be used as long as the pressure in the gasification furnace 3 can be transmitted to the damper 39.

The bypass conduit of the present invention is not limited to the constitutions of the first and second embodiments, but may be any of various waste gasification and melting apparatuses provided with a gasification furnace, a melting furnace and an induction ventilator. The present invention can be applied to a waste gasification and melting apparatus having the above configuration.

[0037]

According to the present invention, the pressure in the gasification furnace can be maintained at a negative pressure regardless of the amount of gas generated in the gasification furnace of the waste gasification and melting apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a schematic configuration and operation of a first embodiment of a waste gasification and melting apparatus to which the present invention is applied.

FIG. 2 is a graph showing a change in pressure of a conventional waste gasification and melting apparatus.

FIG. 3 is a schematic cross-sectional view showing a schematic configuration and operation of a second embodiment of a waste gasification and melting apparatus to which the present invention is applied.

[Explanation of symbols]

 3 Gasifier 5 Melting furnace 22 Gas 25 Melting furnace outlet line 35 Bypass line

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F23G 5/50 F23J 1/00 B F23J 1/00 B09B 3/00 303K F-term (reference) 3K061 AB02 AB03 BA02 BA06 NB30 3K062 AB02 AB03 DA11 DB16 3K078 AA02 AA06 BA03 CA02 4D004 AA46 CA27 CA29 DA02 DA07

Claims (3)

[Claims] 1. A gasifier for thermally decomposing waste, a gas passage through which a gas generated by the pyrolysis flows, and a gas passage provided in the gas passage to attract the gas into the gas passage. And an unburned gas that is provided in a portion of the gas flow path between the gasification furnace and the induced draft fan that burns the gas and unburned components that accompany the gas, and melts ash. A waste gasification / melting apparatus comprising: a melting furnace; and the gas generated in the gasification furnace, wherein the melting furnace is bypassed to the melting furnace, A waste gasification / melting apparatus, wherein a bypass flow path is provided to flow into a portion between the two. 2. A gasifier for thermally decomposing waste, a transport path for transporting waste to the gasifier, a gas flow path through which gas generated by the pyrolysis flows, and a gas flow path. An induction ventilator that is provided in the gas flow path for inducing the gas to flow therethrough, and the gas and the gas that are provided in a portion of the gas flow path between the gasification furnace and the induction ventilator. A waste gasification and melting apparatus comprising: a melting furnace for burning entrained unburned components and melting ash, wherein the gas flowing from the gasification furnace to the transfer path is passed through the melting furnace. A waste gasification and melting apparatus, wherein a bypass flow path is provided to be bypassed and flow into a portion of the gas flow path between the melting furnace and the induction ventilator. 3. The waste gasification and melting apparatus according to claim 1, further comprising an on-off valve for controlling opening and closing of the bypass flow passage in accordance with a pressure in the gasification furnace.