JP4546508B2 - Waste supply device for gasifier and waste supply method to gasifier - Google Patents

Description

  The present invention relates to a gas supply melting furnace waste supply apparatus and a gas supply furnace waste supply method for continuously supplying waste gas such as sewage sludge and municipal waste to a gasification furnace. The present invention relates to a waste gas supply apparatus for a gasification furnace and a method for supplying waste to a gasification furnace, which are excellent in quantitative supply performance of the waste.

  In recent years, gasification and melting furnaces that can simultaneously achieve volume reduction of waste such as sewage sludge and municipal waste and detoxification of ash have attracted attention. This gasification and melting furnace gasifies waste such as sewage sludge and municipal waste in a gasification furnace (500 to 600 ° C.), and decomposes the waste into combustible gas, fixed carbon and ash. Next, by burning the decomposed combustible gas and fixed carbon in the melting furnace, the temperature in the melting furnace is raised to 1300 ° C. or higher to melt the ash, and the molten slag is made into water-cooled slag by cooling with water, for example. is there.

A waste supply device that supplies waste to a gasification furnace is required to have a fixed amount of waste and a sealing property.
(1) Quantitative supply of waste Stabilize combustion by minimizing fluctuations in the supply of waste. Thereby, since the temperature of a melting furnace is also stabilized, the meltability of ash is also stabilized.
(2) to prevent the inflow of external air into the sealability gasifier, combustible gas from the gasifier (CO, H, CH _4, etc.) leakage of.
As a waste gas supply apparatus for a gasification furnace, for example, one having a configuration in which a double damper is provided in a chute is known.

  Hereinafter, a waste gas supply device (combustible material supply device) according to a conventional example will be described with reference to the accompanying drawings. FIG. 3 shows a schematic configuration of a conventional fluidized bed gasification furnace and a combustible material supply apparatus (hereinafter referred to as a waste supply apparatus) that supplies combustible material (hereinafter referred to as waste) to the fluidized bed gasification furnace. FIG. Reference numeral 50 shown in FIG. 4 is a fluidized bed gasification furnace (hereinafter referred to as a gasification furnace), and includes a screw conveyor 64 driven by a motor 68 at a waste charging port 53 of the gasification furnace 50. An article supply mechanism 62 is provided, a chute 63 including double dampers 59 and 59 connected to the waste supply mechanism 62 is provided, and a conveyor 65 connected to the chute 63 is provided.

  The waste 54 put into the hopper 66 by the crane 61 or the like is carried up by the conveyor 65 and is put into the upper opening of the chute 63 from the tip of the conveyor 65. The waste 54 thrown into the chute 63 is intermittently thrown into the waste supply mechanism 62 by the operation of the double dampers 59 and 59 having a sealing function. The waste supply mechanism 62 relaxes the intermittentness of the intermittently input waste by the screw conveyor 64 and continuously (quantitatively) input the gasification furnace 50 with a predetermined amount.

The waste 54 thrown into the gasification furnace 50 is gasified under a reducing atmosphere in the fluidized bed 51 flowing by the fluidizing gas 52 flowing from the bottom wind box, and the gasified product gas 57 is The fluid passes through the fluidized bed 51, passes through the free board 55, and is led from the product gas outlet 56 to a melting furnace (not shown). In this case, since the waste 54 intermittently supplied from the chute 63 is continuously (quantitatively) supplied in a substantially constant amount by the action of the screw conveyor 64 of the waste supply mechanism 62, the fluidized gas 52 Control for performing stable gasification operation of the gasification furnace 50 such as supply control and in-furnace temperature control becomes extremely easy. In addition, the sealing function of the double dampers 59 and 59 can also prevent external air leaking from the waste inlet 5 into the gasification furnace 50 (see, for example, Patent Document 1).
JP 2003-56822 A

  The waste gas supply device of the gasification furnace according to the above conventional example is excellent in sealing performance because the chute is provided with a double damper, and the waste supply mechanism includes a screw conveyor. It is considered that the quantitative supply of waste to the chemical reactor is also excellent. However, it is not necessarily sufficient from the viewpoint of quantitative supply of waste in the waste gas supply apparatus of the gasification furnace according to this conventional example.

(1) Since the support shaft that supports the lower damper so that it can be opened and closed is provided on the inner wall side of the chute gasification furnace, the waste is gasification furnace of the screw conveyor 64 of the waste supply mechanism 62. To the position farthest away from the head. Therefore, as a result of the time required for the waste to reach the waste gas inlet of the gasifier, there is a time when there is little waste on the screw conveyor 64. Therefore, the amount of waste supplied to the gasifier is reduced. fluctuate.
(2) When the screw conveyor of the waste supply mechanism is provided with a pair of conveying screws having rotation centers parallel to each other on a horizontal plane, the waste volume is biased in the width direction and the longitudinal direction of the screw conveyor. Occurs. More specifically, since a portion where the left volume of the waste increases and a portion where the right volume increases increase in the longitudinal direction of the screw conveyor, the amount of waste supplied to the gasification furnace varies.

  Therefore, an object of the present invention is to provide a waste gas supply apparatus for a gasification furnace and a waste supply method for the gasification furnace, which are superior in the quantitative supply performance of waste.

  The present invention has been made in view of the above circumstances. Therefore, in order to solve the above problems, the gist of the means adopted by the waste gas supply apparatus for gasifier according to claim 1 of the present invention is as follows. A vertical chute portion that has a sealing function to prevent the inflow of air into the gasification furnace and that is alternately opened and closed and is provided with a vertical gap at predetermined intervals in the vertical direction. Waste comprising a seal chute portion connected to the lower end portion of the chute portion and comprising a horizontal chute portion provided with a waste conveyance device for conveying waste supplied through the lower damper in the direction of the gasification furnace In the waste gas supply apparatus for a gasification furnace provided with a supply chute, the lower damper is parallel to a longitudinal center line passing through the center in the width direction of the horizontal chute portion, and the vertical shoe. The lower left damper and the lower right damper are opened and closed via a support shaft provided on the opposite inner wall side of the part, and the merged line of the tip of the lower left damper and the lower right damper in the closed state is the center line It is comprised so that it may be located above.

  The gist of the waste gas supply apparatus for gasification furnace according to claim 2 of the present invention is that the waste gas supply apparatus for gasification furnace according to claim 1, wherein the lower left damper and lower right damper of the lower damper are used. The damper is characterized in that in the closed state, the damper is configured to become a lower position from the support shaft side toward the tip end side.

  The gist of the means adopted by the waste gas supply apparatus for gasification furnace according to claim 3 of the present invention is the waste gas supply apparatus for gasification furnace according to any one of claims 1 and 2, The waste transport device is a screw conveyor including a pair of transport screws having rotation centers parallel to each other on a horizontal plane.

  The gist of the waste gas supply apparatus for gasification furnace according to claim 4 of the present invention is that the waste supply apparatus for gasification furnace according to claim 3, wherein The present invention is characterized in that a waste crusher for crushing the waste conveyed by the screw conveyor is provided.

  The gist of the means adopted by the method for supplying waste to a gasifier according to claim 5 of the present invention is to have a sealing function for preventing the flow of external air into the gasifier and to be alternately opened and closed. A vertical chute portion in which an upper damper and a lower damper are provided at a predetermined interval in the vertical direction and a lower end portion of the vertical chute portion are connected to the waste gas supplied through the lower damper. In a waste supply method to a gasifier by a waste supply device comprising a waste supply chute comprising a seal chute portion comprising a horizontal chute portion provided with a waste conveyance device for conveying in the direction, After closing the upper damper, the lower damper is provided on the inner wall side parallel to the longitudinal center line passing through the center of the horizontal chute portion in the width direction and opposite to the vertical chute portion. The support shaft is double-opened as a fulcrum, and the waste received when the upper damper is opened is dropped toward the center line in order to be transported by the waste transport device. .

  The gist of the means adopted by the method for supplying waste to a gasifier according to claim 6 of the present invention is conveyed by the waste conveying apparatus in the method for supplying waste to a gasifier according to claim 5. It is characterized in that the waste that has been fed is supplied to the gasifier while being crushed by a waste crusher.

  In the waste gas supply apparatus for a gasification furnace according to claim 1 of the present invention, the lower damper is parallel to the longitudinal center line passing through the center in the width direction of the horizontal chute portion of the seal chute part provided in the waste supply chute. And comprising a lower left damper and a lower right damper that are opened and closed via a support shaft provided on the opposite inner wall side of the vertical chute portion of the seal chute portion of the waste supply chute, in the closed state The merged line between the lower left damper and the lower right damper tip is configured to be located above the center line. In the waste supply method to the gasifier according to claim 5 of the present invention, after closing the upper damper, the lower damper is parallel to the longitudinal center line passing through the center in the width direction of the horizontal chute portion. In order to convey the waste received when the upper damper is opened by using a support shaft provided on the opposite inner wall side of the vertical chute portion as a fulcrum, Drop toward the center line.

  Therefore, according to the waste gas supply apparatus for a gasification furnace according to claim 1 of the present invention or the waste gas supply method for a gasification furnace according to claim 5 of the present invention, the waste conveying apparatus is provided with a lower damper. Waste with a length corresponding to the dimension in the direction of the gasifier can be supplied. Moreover, immediately after the lower left damper and the lower right damper start to open, the waste falls to the center in the width direction of the waste transport device. However, as the opening width increases, it also falls in a direction away from the center in the width direction. Therefore, the cross-sectional shape of the waste on the waste transport device at each position in the lengthwise direction of the gasifier is a mountain shape, and the deviation of the left and right volume of the waste is reduced. The quantitative supply performance to the furnace is improved.

  In the waste gas supply apparatus for a gasification furnace according to claim 2 of the present invention, the lower left damper and the lower right damper of the lower damper are lowered from the support shaft side toward the distal end side in the closed state. It is configured. Therefore, according to the waste gas supply apparatus for a gasifier according to claim 2 of the present invention, the upper surfaces of the lower left damper and the lower right damper are inclined before opening, and are formed in a hopper shape. When the lower left damper and the lower right damper start to open, waste can be efficiently supplied onto the waste transport device.

  In the waste gas supply apparatus for a gasification furnace according to claim 3 of the present invention, the waste conveyance device is a screw conveyor provided with a pair of conveyance screws having rotation centers parallel to each other on a horizontal plane. Therefore, according to the waste gas supply apparatus for a gasification furnace according to claim 3 of the present invention, a waste having a length corresponding to the dimension of the lower damper in the gasification furnace direction is transferred from the lower damper to a pair of screw conveyors. Supplied between screws.

  In the waste gas supply apparatus for a gasification furnace according to claim 4 of the present invention, a waste crusher for crushing the waste conveyed by the screw conveyor is provided at a position in front of the tip of the screw conveyor. Moreover, in the waste supply method to the gasification furnace concerning Claim 6 of this invention, the waste conveyed by the waste conveyance apparatus is supplied to a gasification furnace, crushing by a waste crusher.

  Therefore, according to the waste gas supply apparatus for a gasification furnace according to claim 4 of the present invention or the waste supply method to the gasification furnace according to claim 6 of the present invention, it is conveyed by a screw conveyor or a waste crusher. Since the generated waste is crushed by the waste crusher, the quantitative supply performance of the waste is further improved.

  Hereinafter, a waste gas supply apparatus for a gasification furnace according to an embodiment of the present invention will be described with reference to the attached drawings. FIG. 1 is a schematic configuration diagram of a gasification furnace waste supply apparatus according to an embodiment of the present invention, and FIG. 2A is a cross-sectional view taken along line AA of FIG. FIG. 2B is a sectional view taken along the line B-B in FIG. 1, and is an explanatory view of the shape of the waste supplied to the pair of transport screws of the screw conveyor (waste transport device). It is explanatory drawing which shows the planar state of the waste conveyed by a pair of conveyance screw.

  The code | symbol 1 shown to a figure is the waste supply apparatus which concerns on embodiment of this invention. This waste supply device 1 is connected to a seal chute portion 7 having a configuration which will be described later, and this seal chute portion 7, and supplies waste 9 in an obliquely downward direction to a waste inlet 21 of a gasification furnace 20. A waste supply chute 6 including a tip chute portion 8 is provided. That is, the waste 9 thrown into the waste hopper 2 by a waste throwing device (not shown) such as a crane is pushed out by the pusher 3, and the pushed waste 9 is roughly crushed by the crusher 4. The waste 9 roughly crushed by the crusher 4 is conveyed obliquely upward by a conveyor 5 provided in an airtight conveyor housing, and is dropped and supplied to the seal chute portion 7. Has been.

  The seal chute portion 7 is provided with a double damper having a sealing function, which will be described later, and has a vertical chute portion 7a having a rectangular cross section and a lower portion of the vertical chute portion 7a. Is composed of a horizontal chute portion 7b in which a screw conveyor and a waste crusher, which will be described later, are disposed as a waste conveying device for conveying the gas to the gasification furnace 20 side. Furthermore, the upper end of the tip chute 8 that communicates with the waste inlet 21 of the gasification furnace 20 obliquely downward is connected to the lower end of the horizontal chute 7 a of the seal chute 7.

  The double dampers provided in the vertical chute portion 7a are an upper damper 11 and a lower damper 12 provided at a predetermined interval below the upper damper 11 as shown in FIG. It is configured. First, the structure of the upper damper 11 will be described. The upper damper 11 includes an upper left damper 11a and an upper right damper 11b. The upper left damper 11a is provided on the left inner wall side in parallel to the longitudinal center line Lc passing through the center of the horizontal chute portion 7b in the width direction and toward the gasification furnace 20 of the vertical chute portion 7a. It is opened and closed via the upper support shaft 11p. The upper right damper 11b is provided on the right inner wall side in parallel to the longitudinal center line Lc passing through the center of the horizontal chute portion 7b in the width direction and toward the gasification furnace 20 of the vertical chute portion 7a. The upper support shaft 11p is opened and closed.

  The merged line 11c defined by the contact of the straight tip portions facing each other when the upper left damper 11a and the upper right damper 11b are closed is the center of the horizontal width of the vertical chute portion 7a, that is, the horizontal chute. The portion 7b is configured to be positioned above the longitudinal center line Lc passing through the center in the width direction. In the state where the upper left damper 11a and the upper right damper 11b are closed, the upper left damper 11a and the upper right damper 11b become lower as they move from the upper support shaft 11p side toward the tip end side. Specifically, the angle θ formed by the upper left damper 11a and the upper right damper 11b is configured to be, for example, 150 °. In the present embodiment, the upper damper 11 has a two-sheet configuration including an upper left damper 11a and an upper right damper 11b. However, as in the case of the conventional example, the upper damper 11 has a single configuration and is vertical. The chute portion 7a may be configured to be opened and closed via an upper support shaft provided on the inner wall side of the gasification furnace 20 direction.

  Next, the structure of the lower damper 12 will be described. The lower damper 12 includes a lower left damper 12a and a lower right damper 12b. The lower left damper 12a is provided on the left inner wall side in parallel to the longitudinal center line Lc passing through the center of the horizontal chute portion 7b in the width direction and toward the gasification furnace 20 of the vertical chute portion 7a. It is configured to be opened and closed via the lower support shaft 12p. The lower right damper 12b is provided on the right inner wall side in parallel to the longitudinal center line Lc passing through the center of the horizontal chute portion 7b in the width direction and toward the gasification furnace 20 of the vertical chute portion 7a. The lower support shaft 12p is opened and closed.

  The merged line 12c defined by the contact of the straight tip portions facing each other when the lower left damper 12a and the lower right damper 12b are closed is the center of the horizontal width of the vertical chute portion 7a, that is, the horizontal chute. The portion 7b is configured to be positioned above the longitudinal center line Lc passing through the center in the width direction. In the state where the lower left damper 12a and the lower right damper 12b are closed, the lower left damper 12a and the lower right damper 12b are lowered from the lower support shaft 12p side toward the tip end side. More specifically, the angle θ formed by the lower left damper 12a and the lower right damper 12b is configured to be 150 °, for example. According to the lower damper 12 having such a configuration, since the upper surfaces of the lower left damper 12a and the lower right damper 12b are inclined before opening and are formed in a hopper shape, the lower left damper 12a and the lower right damper are formed. If 12b begins to open, the outstanding effect that waste can be efficiently supplied on the screw conveyor mentioned later can be acquired.

  The upper damper 11 and the lower damper 12 are alternately opened and closed so that one of the upper damper 11 and the lower damper 12 is always closed in order to prevent external air from flowing into the gasification furnace 20. It is configured as follows.

  Inside the horizontal chute portion 7 b of the seal chute portion 7, a screw conveyor 13 for conveying waste supplied from the lower damper 12 in the direction of the gasification furnace 20 is accommodated. The screw conveyor 13 includes a pair of conveying screws 13a having rotation centers parallel to each other on a horizontal plane. Further, a waste crusher 14 for crushing the waste extruded by the screw conveyor 13 is provided on the distal end side of the screw conveyor 13 and at an outer position thereof. In addition, although the waste crusher 14 in this Embodiment is a rotary type, the thing of a rocking | swiveling structure is employable.

  Hereinafter, an operation mode of the waste supply apparatus 1 configured as described above will be described. The waste 10 supplied to the waste hopper 2 is extruded by the pusher 3, and the extruded waste is roughly crushed by the crusher 4. The waste roughly crushed by the crusher 4 is transported obliquely upward by the conveyor 5 and is dropped and supplied onto the upper damper 11 of the vertical chute portion 7 a of the seal chute portion 7.

  When a predetermined amount of waste accumulates on the upper damper 11, the upper damper 11 opens and closes several seconds after opening. During this time, the predetermined amount of waste accumulated on the upper damper 11 and the conveyor The waste carried up obliquely by 5 is put on the upper surface of the lower damper 12. Next, several seconds after the upper damper 11 is closed, the lower damper 12 is opened, and is held open for several seconds after being opened. For this reason, when the waste thrown in on the lower damper 12 is supplied onto the screw conveyor 13, the straight straight ends of the lower left damper 12a and the lower right damper 12b are opened, so that the horizontal chute portion 7b On the longitudinal center line Lc passing through the center in the width direction, specifically, between the pair of conveying screws 13a of the screw conveyor 13.

  Accordingly, waste having a length corresponding to the dimension of the lower damper 12 in the direction of the gasification furnace 20 is supplied onto the pair of transport screws 13 a of the screw conveyor 13, and the waste is also supplied to the pair of transport screws 13 a of the screw conveyor 13. Because of the mountain shape in the width direction, the left and right volume of the waste is less biased. The waste supplied to the screw conveyor 13 is transported by the rotation of the pair of transport screws 13 a, further finely crushed by the waste crusher 14, and gasified from the waste inlet 21 via the tip chute 8. The furnace 20 is charged. The waste thrown into the gasification furnace 20 is gasified at a temperature of 500 to 600 ° C., and decomposed into combustible gas, fixed carbon, and ash. Next, the decomposed combustible gas and the fixed carbon are burned in a melting furnace (not shown), and the ash is melted at a temperature of 1300 ° C. or higher in the melting furnace to form molten slag. The lower damper 12 is closed within a few seconds after supplying waste to the screw conveyor 13, and the upper damper 11 and the lower damper 12 are opened so that the previously closed upper damper 11 is opened. It is repeatedly opened and closed once at predetermined intervals.

  In the waste supply apparatus 1 according to the embodiment of the present invention, as described above, the lower damper 12 has a longitudinal direction passing through the center in the width direction of the horizontal chute portion 7b of the seal chute portion 7 included in the waste supply chute 6. The lower left damper opened and closed via a lower support shaft 12p provided on the opposite inner wall side of the vertical chute portion 7a of the seal chute 7 provided in the waste supply chute 6 and parallel to the center line Lc of 12a and the lower right damper 12b, and the merged line 12c at the tip of the lower left damper 12a and the lower right damper 12b in the closed state is positioned above the center line Lc.

  Therefore, according to the waste supply apparatus 1 according to the embodiment of the present invention, it is possible to supply the screw conveyor 13 with waste having a length corresponding to the dimension of the lower damper 12 in the gasification furnace 20 direction, Moreover, immediately after the lower left damper 12a and the lower right damper 12b begin to open, the waste is centered in the width direction of the screw conveyor 13 (the position of the center line Lc in the longitudinal direction passing through the center in the width direction of the horizontal chute portion 7b), That is, it falls between the pair of conveying screws 13a, and also drops in a direction away from the center in the width direction as the opening width increases. Therefore, the cross-sectional shape of the waste 9 on the pair of conveying screws 13a of the screw conveyor 13 at each position in the length direction in the gasification furnace direction is a mountain shape, and the left and right volumes of the waste 9 are less biased. Therefore, the quantitative supply performance of waste to the gasifier is improved.

  Further, in the waste supply apparatus 1 according to the embodiment of the present invention, the lower left damper 12a and the lower right damper 12b of the lower damper 12 are lowered in the closed state from the lower support shaft 12p side toward the front end side. It is configured to be in position. Accordingly, since the upper surfaces of the lower left damper 12a and the lower right damper 12b are inclined before opening and are formed in a hopper shape, when the lower left damper 12a and the lower right damper 12b start to open, they are efficiently discarded. Objects can be supplied onto the pair of conveying screws 13 a of the screw conveyor 13.

  Furthermore, a waste crusher 14 for crushing the waste extruded from the screw conveyor 13 is provided at a position in front of the tip of the screw conveyor 13, and the waste conveyed by the rotation of the pair of conveying screws 13a is disposed. Since the waste is further finely crushed by the waste crusher 14 and fed into the gasification furnace 20 from the waste inlet 21 via the tip chute 8, the supply of large-scale waste is eliminated and the quantitative supply is improved. Can greatly contribute to. In addition, it is possible to suppress the generation of harmful components in the exhaust gas and to suppress fluctuations in the amount of gas generated. This makes it possible to improve the performance of the gasification and melting plant and reduce the margin of each equipment, thereby reducing the cost of the gasification and melting plant. Can also contribute.

The waste gas supply apparatus for a gasification furnace according to the above embodiment is only one specific example of the present invention. Therefore, design changes and the like can be freely made without departing from the technical idea of the present invention. The form of the furnace waste supply apparatus is not limited to the configuration according to the above embodiment.
For example, in the above embodiment, the case where the conveyor 5 is provided in the waste supply apparatus 1 has been described as an example. However, without providing a conveyor, the waste crushed by the crusher 4 can be directly dropped and supplied to the seal chute unit 7. By adopting such a configuration, the installation space may be narrow, and the building that accommodates these facilities can be made smaller, so that an economic effect that the facility cost related to the waste supply device can be reduced is obtained. .

  Moreover, the crusher 4 can be set separately from the waste supply apparatus 1. By adopting such a configuration, even if the crusher 4 is stopped during operation due to some trouble, waste can be continuously supplied to the gasification furnace 20 by the waste supply device 1. The effect that continuous operability is improved is obtained.

It is typical structure explanatory drawing of the waste supply apparatus of the gasification furnace which concerns on embodiment of this invention. FIG. 2A is a cross-sectional view taken along line AA in FIG. 1, and is an open / closed state of the upper damper and the lower damper, and an explanatory diagram of the shape of the waste supplied to the pair of conveying screws of the screw conveyor, FIG. b) is a cross-sectional view taken along the line B-B in FIG. 1, and is an explanatory view showing a planar state of waste conveyed by a pair of conveying screws of a screw conveyor. It is a figure which shows schematic structure of the fluid bed gasification furnace which concerns on a prior art example, and the waste supply apparatus which supplies a waste material to this fluidized bed gasification furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Waste supply apparatus 2 ... Waste hopper 3 ... Pusher 4 ... Crusher 5 ... Conveyor 6 ... Waste supply chute 7 ... Seal chute part, 7a ... Vertical chute part, 7b ... Horizontal chute part 8 ... Tip chute part 9 ... Waste 11 ... Upper damper, 11a ... Upper left damper, 11b ... Upper right damper, 11c ... Merged line, 11p ... Upper support shaft 12 ... Lower damper, 12a ... Lower left damper, 12b ... Lower right damper, 12c ... Merge Wire, 12p ... Lower support shaft 13 ... Screw conveyor, 13a ... Conveying screw 14 ... Waste crusher 20 ... (Fluidized bed) gasification furnace, 21 ... Waste inlet Lc ... Center of width direction of horizontal chute portion 7b Longitudinal center line θ ... An angle between the upper left damper and the upper right damper

Claims (6)

  A vertical chute portion having a sealing function for preventing the flow of external air into the gasification furnace and having upper and lower dampers alternately opened and closed at predetermined intervals in the vertical direction; and Disposal provided with a seal chute portion that is connected to the lower end portion of the vertical chute portion and includes a horizontal chute portion provided with a waste conveyance device that conveys waste supplied through the lower damper in the direction of the gasification furnace. In the waste gas supply apparatus for a gasification furnace provided with a material supply chute, the lower damper is parallel to a longitudinal center line passing through the center in the width direction of the horizontal chute part, and the vertical chute part It consists of a lower left damper and a lower right damper that are opened and closed via a support shaft provided on the opposite inner wall side, and the tips of the lower left damper and the lower right damper in the closed state Merging lines, waste feed device of the gasification furnace characterized by comprising configured to be positioned above the center line.   2. The gas according to claim 1, wherein the lower left damper and the lower right damper of the lower damper are configured to be in a lower position from the support shaft side toward the distal end side in the closed state. Furnace waste supply equipment.   The said waste conveyance apparatus is a screw conveyor provided with a pair of conveyance screw which has a mutually parallel rotation center on a horizontal surface, Either one of Claim 1 or 2 characterized by the above-mentioned. Gasifier waste supply equipment.   The waste supply apparatus for a gasification furnace according to claim 3, wherein a waste crusher for crushing the waste conveyed by the screw conveyor is provided at a position in front of the tip of the screw conveyor.   A vertical chute portion having a sealing function for preventing the flow of external air into the gasification furnace and having upper and lower dampers alternately opened and closed at predetermined intervals in the vertical direction; and Disposal provided with a seal chute portion that is connected to the lower end portion of the vertical chute portion and includes a horizontal chute portion provided with a waste conveyance device that conveys waste supplied through the lower damper in the direction of the gasification furnace. In a waste supply method to a gasification furnace by a waste supply device comprising a waste supply chute, after closing the upper damper, the lower damper is moved in the longitudinal direction through the center in the width direction of the horizontal chute portion. A waste shaft received when the upper damper is opened by opening the upper damper in parallel with the support shaft provided on the opposite inner wall side of the vertical chute portion as a fulcrum. Objects and to carry with the waste conveying system, waste feed method to the gasifier, characterized in that for dropping towards the center line.   6. The method of supplying waste to a gasifier according to claim 5, wherein the waste transported by the waste transport device is supplied to the gasifier while being crushed by a waste crusher.

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