JP2001241622A - Waste supply method and facility in gasification melting facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat separation water that is separated from waste being thrown into a furnace. SOLUTION: In the gasification melting facilities that are provided with a gasification furnace 1 for thermally decomposing waste, and a combustion melting furnace 2 for melting accompanied ash, char, or the like by burning the thermal decomposition gas, a compression dewaterer 8 for dewatering the waste is provided at a waste supply line 3 for supplying the waste to the gasification furnace 1, separation water that is separated from the compression dewaterer 8 is separated into a flammable constituent that is made of a methane gas and s solid content by a methane fermentation tank 52 and a centrifugal separator 53, and a noncombustible constituent that is made of waste liquid, the methane gas is supplied to a melting chamber 2a of the combustion melting furnace 2 and the solid content is supplied to the furnace 1 for burning, and at the same time the waste liquid is supplied to a secondary combustion chamber 2b of the combustion melting furnace 2 for incineration treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gasification furnace for pyrolyzing wastes and a combustion and melting furnace for burning the pyrolysis gas to melt ash and unburned components (such as char). The present invention relates to a waste supply method and a supply facility for adjusting the moisture content of waste to a gasification furnace in a gasification and melting facility provided.

[0002]

2. Description of the Related Art A conventional gasification and melting facility includes a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas to melt accompanying ash and char. In order to adjust the water content of the waste supplied to the gasification furnace, the present inventors have proposed in Japanese Patent Application No. 10-187976 a device in which a dewatering machine is provided in a waste supply line.

[0003]

However, if the separated water discharged from the dehydrator is to be treated using a wastewater treatment facility, the wastewater treatment facility contains a large amount of solids after separation. There is a problem that the burden on the user is large.

[0004] Before the dehydrator is put into the dehydrator, metals are removed from the waste in consideration of the adverse effect on the dehydrator. The removed metals, such as canned cans, are mixed with the waste inside. However, since many wastes are attached, it is necessary to completely remove the wastes from metals in order to reuse them. For this reason, there is a problem that it is difficult to treat metals removed from waste.

The present invention solves the above-mentioned problems, and enables the separated water separated by adjusting the water content of the waste to be satisfactorily treated by the gasification and melting facility, and the removed metals to be reused satisfactorily. An object of the present invention is to provide a waste supply method and a supply facility in a gasification and melting facility that can be used.

[0006]

According to a first aspect of the present invention, there is provided a method for supplying waste in a gasification and melting facility, comprising: a gasification furnace for thermally decomposing waste; A method for supplying waste in a gasification and melting facility comprising: a combustion and melting furnace for melting entrained ash and unburned matter by burning, wherein the waste is dehydrated by mechanical dewatering means, And the separated water discharged from the dewatering means is separated into combustible components and incombustible components, and the combustible components are supplied to the gasifier and the combustion melting furnace for combustion, and the noncombustible components are supplied to the gasifier. And incinerate it.

A waste supply facility in a gasification and melting facility according to a fifth aspect of the present invention is a gasification furnace for thermally decomposing waste, and the pyrolysis gas is burned to melt entrained ash and char. A waste supply facility in a gasification and melting facility having a combustion and melting furnace, wherein a dewatering means for mechanically dewatering waste is provided in a waste supply line from the refuse hopper to the gasification furnace. Separates the separated water into combustible components and incombustible components by using the combustible components and supplies them to the combustion melting furnace and gasifier, and supplies the incombustible components to the gasifier for incineration. A processing line is provided.

According to each of the above structures, the separated water dewatered and separated from the waste can be treated by the gasification and melting equipment, so that the wastewater treatment equipment becomes unnecessary and is included in the separated water. Since the combustible component is used as a heat source of the gasification and melting facility, the separated water can be efficiently treated.

According to a second aspect of the present invention, there is provided a method for supplying waste in a gasification and melting facility according to the first aspect, wherein the combustible component is methane gas fermented from separated water, and the methane gas is melted in a melting chamber of a combustion melting furnace. This is a method of using the ash as a heat source for melting the ash.

According to a sixth aspect of the present invention, there is provided a waste supply facility in a gasification and melting facility, wherein a methane gas fermentation means for generating methane gas from the separated water is provided in a separation water treatment line, and the methane gas generated by the methane gas fermentation means is burned and melted. A gas utilization line is provided for supplying to a melting chamber of a furnace for combustion.

According to each of the above structures, methane gas is fermented from the separated water, and this methane gas is used as a heat source of the combustion melting furnace, so that it can be effectively used as a heat source of the combustion melting furnace.

Further, in the method for supplying waste in a gasification and melting facility according to a third aspect, in the configuration according to the first or second aspect, the combustible component is a solid separated from the separated water. This is a method in which the waste liquid is supplied to a gasification furnace to be thermally decomposed, and the waste liquid after the separation of the solid matter is introduced into a combustion melting furnace to be incinerated.

According to a seventh aspect of the present invention, in the waste supply facility in the gasification and melting facility, a solid water separation means for separating the separated water into a solid content and a waste liquid is provided in the separated water treatment line, and the separated water is separated by the solid water separation means. A solid content utilization line for supplying the separated solid content to the gasification furnace is provided, and a separated water treatment line is provided for injecting the waste liquid separated by the solid-water separation means into a combustion melting furnace for incineration.

According to the above configuration, since the solid content is put into the gasification furnace and pyrolyzed, the solid content contained in the separated water can be effectively used as a heat source. Further, since wastewater is incinerated in a combustion melting furnace, it is possible to surely decompose malodorous components and harmful components and render them harmless.

Further, according to a fourth aspect of the present invention, there is provided a method of supplying waste in a gasification and melting facility, comprising: a gasification furnace for thermally decomposing waste; A method for supplying waste in a gasification and melting facility equipped with a combustion and melting furnace that separates and separates metals from the waste and mechanically dewaters the waste. This is a method of mixing and supplying to a gasification furnace.

Further, the waste supply equipment in the gasification and melting equipment according to claim 8 is a gasification furnace for thermally decomposing waste,
A waste supply facility in a gasification and melting facility comprising a combustion and melting furnace for burning the pyrolysis gas and melting entrained ash and char, etc., wherein a waste supply line from a waste hopper to the gasification furnace is provided. The dewatering means for dewatering the waste is provided, and on the inlet side of the dewatering means, a metal separating means for separating metals from the waste is provided, and the separated metals are dewatered after being discharged from the dewatering means. A metal merging treatment line is provided for mixing with waste and supplying the gasification furnace.

According to the above construction, the metals that have been removed by the metal sorting and separating means and to which a large amount of waste has adhered are supplied to the gasifier together with the dewatered waste, so that the attached waste is thermally decomposed. , And the reuse of the discharged metals can be facilitated.

Further, according to a ninth aspect of the present invention, there is provided a method for supplying waste in a gasification and melting facility, comprising: a gasification furnace for thermally decomposing waste; A waste supply method in a gasification and melting facility provided with a combustion and melting furnace, wherein the waste is dewatered by a mechanical first dewatering means to separate the waste into primary dewatered waste and primary separated water. The dewatered waste is charged into the gasification furnace, and the primary separated water is further dewatered by a mechanical second dewatering means to be separated into secondary dewatered waste and secondary separated water. This is a method in which secondary separation water is supplied to a combustion melting furnace and incinerated while being supplied to a gasification furnace.

A waste supply facility in a gasification and melting facility according to a tenth aspect of the present invention is a gasification furnace for thermally decomposing waste, and the pyrolysis gas is burned to melt entrained ash and char. A waste supply facility in a gasification and melting facility equipped with a combustion and melting furnace, wherein the waste is mechanically dewatered to a primary dehydration waste supply line from a refuse hopper to a gasification furnace to form a primary dehydration waste. A first dewatering means for separating into primary separated water is provided, and a second dewatering means for mechanically dewatering the primary separated water separated by the first dewatering means to separate it into secondary dewatered waste and secondary separated water. And the dewatering waste is supplied to a gasification furnace, and the secondary separated water is supplied to a combustion melting furnace for incineration.

According to each of the above structures, the waste is dehydrated by the first dehydrating means and separated into primary dewatered waste and primary separated water, and the primary dehydrated waste is charged into the gasification furnace, and the primary separated water is separated. Is further dewatered by a second dewatering means to separate it into secondary dewatered waste and secondary separation water, so that wastewater treatment equipment is not required, and the secondary dewatered waste is put into a gasification furnace to be thermally decomposed. Therefore, the solid content contained in the secondary dewatering waste can be used as a heat source for effective use of resources.Furthermore, since the secondary separation water is incinerated in a combustion melting furnace, odor and harmful components are reduced. Detoxification can be surely made harmless.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, a first embodiment of a waste supply facility in a gasification and melting facility according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, the gasification and melting facility is provided with a gasification furnace 1 for thermally decomposing waste and a combustion and melting furnace 2 for melting ash with a pyrolysis gas discharged from the gasification furnace. are doing. The combustion and melting furnace 2 has a melting portion 2a for burning unburned components such as pyrolysis gas and char, and a communication portion for heating and melting ash accompanying the pyrolysis gas by combustion heat and capturing and collecting the ash as molten slag ( A slag recovery section) 2c and a secondary combustion section 2b for completely combusting exhaust gas.

The waste supply line 3 connected to the gasification furnace 1 from the waste hopper 4 and supplies the waste garbage to the gasification furnace 1 is supplied to the waste supply line 3 in order from the upstream side to collect the raw garbage as waste. A crusher 5 which is a crushing means for crushing, a wind separator 6 which is a dry and wet separating means for separating garbage into dry waste and wet waste, and a metal which removes metals (iron, to be exact) from the inside A magnetic separator 7 as a separating unit, a compression dehydrator 8 as a dehydrating unit for heating and mechanically compressing and dewatering the wet waste while stirring, a dewatered waste sent from the compression dewaterer 8, and a dry waste The feeder 9 is provided with a fixed-quantity feeder 9 serving as a fixed-quantity supply unit that guides a product, metals removed by the magnetic separator 7 and a dehydrated cake described below, mixes them, and sends the mixture to the gasification furnace 1 by a fixed amount.

The dried waste separated by the wind separator 6 is supplied to the fixed waste feeder 9 from the dried waste line 3a.
Is supplied to the entrance. In addition, a large amount of waste is attached to the metals removed by the magnetic separator 7 and is not suitable for reuse as it is. Therefore, the waste is once put into the gasification furnace 1 to incinerate and remove the waste, and then taken out. Reuse. Therefore, the metals removed by the magnetic separator 7 are supplied from the magnetic separator 7 to the inlet of the fixed-quantity feeder 9 via the metal merging line 3b.

Further, in the combustion melting furnace 2, a heat recovery unit 11 is disposed at an outlet side of the secondary combustion unit 2b. Exhaust gas after heat recovery is detoxified by an exhaust gas treatment device 12 and discharged from a chimney 13. The steam heated by the heat recovery unit 11 is introduced into a steam turbine 16 of a power generation facility 15 by a steam supply pipe 14, and a generator 17 is driven to generate electricity, and a part of the steam is heated via a branch steam pipe 18. Is sent to the compression dehydrator 8.

The compression dehydrator 8 includes a separation water treatment line 5
1 is connected. Since the separated water separated from the wet waste by the compression dewatering machine 8 contains a solid content of as much as 10 to 30% in solid concentration, the separated water treatment line 51 converts the separated water into methane gas which is a combustible component. The solid content is taken out and burned in the gasification furnace 1 or the combustion melting furnace 2 for effective use as a heat source, and the waste liquid, which is a non-combustible component after separation, is supplied to the secondary combustion chamber 2b of the incineration melting furnace 2. It is configured to deodorize and detoxify by incineration.

That is, the separated water treatment line 51 is, in order from the compression dehydrator 8 side, a methane fermentation tank 52 which is a fermentation means for generating methane gas from the separated water, and separates a solid content and a waste liquid from the separated water after fermentation. A centrifugal separator 53, which is a solid-water separating means, and a dehydrating liquid tank 54 for storing a waste liquid after solid content separation. A gas use line 51a for sending to 2a is connected. The centrifugal separator 53 is connected to a solid content utilization line 51b that supplies a dehydrated cake, which is a solid content separated from the separated liquid after fermentation, to an inlet of the fixed-quantity feeder 9; The waste liquid is discharged by the liquid feed pump 55 into the secondary combustion chamber 2 of the combustion melting furnace 2.
b, a liquid processing line 51c for injecting into the combustion gas for incineration is connected.

As shown in FIG. 2, the compression dehydrator 8
A drive shaft 24 arranged along a shaft center portion via a bearing 23 in a casing 21 has an equal-diameter portion 22a having the same outer diameter corresponding to the scraping portion 21a and a tip corresponding to the dewatering portion 21b. A screw blade 22 having a reduced-diameter portion 22b with a reduced diameter on the side is provided, and is rotationally driven by a compression / feed motor (not shown). The drive shaft 24 is hollow and has a heating steam passage 24a which is a heating fluid passage.
The branch steam pipe 18 is connected to the base end, and the drain pipe 25 is connected to the drive shaft 24 and the screw blade 22.
It is configured to heat the garbage through.

A heating jacket 27 forming a heating steam passage 26 which is a heating fluid passage is mounted around the scraping portion 21a of the casing 21. And
The branch steam pipe 18 is connected to the supply port 27a of the heating jacket 27 so that the garbage is heated via the casing 21 so that the compression dewatering is effectively performed.
A drain pipe 28 is provided at the discharge port 27b of the heating passage 26.
Is connected.

A plurality of dewatering holes 29 are formed in the dewatering part 21b of the casing 21, and a discharge cover 32 that forms a drainage deaeration passage 31 with the dewatering part 21b is attached. A separation water discharge pipe 33 is connected to a drain port 32a formed at a lower portion of the discharge cover 32, and can be drained from the drain port 32a. A deaeration pipe 34 is connected to a deaeration port 32b formed at an upper portion. Is connected and exhausted.

At the outlet 21c of the casing 21, there is provided a crusher 41 for sealing the refuse of the casing 21 to adjust the internal pressure to promote the dewatering and to crush the compressed garbage. . This crusher 41
A box 42 attached to an outlet 21c of the casing 21 and having a discharge port 42a formed at a lower portion;
A rotating shaft 43 penetrating through the opposing side wall 42b of the box 42 and projecting on the same axis as the casing 21 and rotationally driven by a crushing motor (not shown); Seal head 44 mounted on
Compaction adjustment as biasing means interposed on the rotating shaft 43 between the crushing seal head 44 and the opposing wall 42b to adjust the pressing force for pressing the crushing seal head 44 toward the outlet 21c of the casing 21. And a use spring 45. In addition, the crushing seal head 44 is provided with a crushing blade that is disposed on the surface of the circular face plate at, for example, every 90 degrees in the outer diameter direction from the center and protrudes from the center side, and the outlet 21 c
The resistance of the garbage that is compressed and extruded from the container 21 is compressed while maintaining the internal pressure of the casing 21 and the gasification furnace 1
From the gas flowing backward from the outlet 21c, and further, the compressed lump of garbage extruded from the outlet 21c can be cut into small pieces and discharged while being disintegrated.

Accordingly, the crushing device 41 maintains the inside of the casing 21 at an appropriate pressure to consolidate the garbage and squeeze and dewater it satisfactorily. The garbage is finely disintegrated and is discharged stably in fixed amounts, and is compressed and dewatered to discharge garbage containing substantially equal moisture.

In the above configuration, the garbage supplied from the garbage hopper 4 is first crushed by the crusher 5 in the waste supply line 3, then introduced into the wind separator 6, and dried by the air for separation. Separated from wet waste. After the metals are removed by the magnetic separator 7, the wet waste is quantitatively supplied to the gasification furnace 1 from the compression dehydrator 8 via the quantitative supply feeder 9. The dried waste separated by the wind separator 6 is supplied from a dry waste line 3a to an inlet of a fixed-quantity feeder 9, and metals removed by the magnetic separator 7 are separated from the magnetic separator 7 by a metal merging line 3b. Is supplied to the inlet of the fixed-quantity feeder 9.

At this time, in the compression dehydrator 8, the heating steam supplied from the branch steam pipe 18 while being stirred is supplied to the heating steam passage 24 a of the drive shaft 24 and the heating passage cover 27.
The garbage is heated by being supplied to the heating steam passage 26 in the inside,
The water is further compressed and dewatered by the dewatering section 21b, which is reduced in diameter, and the crushing seal head 44 serving as a discharge resistance, and the separated water is drained from the dewatering hole 29 to the separated water discharge pipe 33. Then, at the outlet 21c, the crushing seal head 44 of the crushing device 41 is provided.
Is driven to rotate and the crushing blade breaks the compressed lump of garbage.

The separated water separated by the compression dehydrator 8 is discharged from a separated water discharge pipe 33 to a separated water treatment line 51 and stored in a methane fermentation tank 52. Here, methane gas, which is a combustible component contained in the separated water, is taken out, sent from the gas utilization line 51a to the melting chamber 2a of the combustion melting furnace 2 and burned together with the pyrolysis gas, and the heat energy of the methane gas is effective for melting ash. Used. At this time, by adjusting the supply amount of methane gas, it may be used for controlling the combustion temperature of the melting chamber 2a. Next, the separated water after fermentation is sent to a centrifugal separator 53 to be separated into a dewatered cake and a waste liquid as solids, and the dewatered cake is sent from a solids utilization line 51b to an inlet of a quantitative feeder 9. On the other hand, the waste liquid is sent from the liquid processing line 51c to the secondary combustion chamber 2b of the combustion and melting furnace 2 via the liquid feed pump 55, is injected into the combustion gas and incinerated, and is deodorized and made harmless. .

In the gasifier 1, the waste supplied from the fixed-quantity feeder 9 is stirred and heated together with the fluidized medium,
Pyrolysis (dry distillation) with insufficient air. Then, the metals input together with the wastes are discharged together with the fluid medium after the attached wastes are incinerated, and are separated by the sorting apparatus 19.
And the fluid medium is circulated to the gasification furnace 1 via the medium circulation line 20, and the metals are reused.

The pyrolysis gas containing unburned components, char and the like discharged from the gasification furnace 1 is sent to the melting part 2a of the combustion melting furnace 2 where it is burned at a high temperature and melted in the communicating part 2c. Ash (molten slag) is captured. After complete combustion in the secondary combustion chamber 2b and incineration of the injected waste liquid, the combustion exhaust gas is sent to the heat recovery unit 11 for heat recovery, and then collected and detoxified by the exhaust gas treatment device 12. Later, it is discharged from the chimney 13. The steam heated by the heat recovery unit 11 is sent to a steam turbine 16 of a power generation facility 15 and used for power generation. A part of the steam is sent to the compression dehydrator 8 through the branch steam pipe 18 and used for heating and dehydrating garbage.

According to the first embodiment, after the waste is separated into dry waste and wet waste by the wind separator 6,
Since the wet waste is dewatered by the compression dewatering machine 8, the water content of the waste supplied to the gasification furnace 1 can be made low and substantially uniform regardless of the water content before the introduction. Separated water separated from the waste by the compression dehydrator 8 is separated into a combustible component and a non-combustible component by the methane fermentation tank 52 and the centrifugal separator 53, and the methane gas as the combustible component is melted in the melting chamber of the combustion melting furnace 2. By supplying to 2a, the combustion temperature of the combustion gas can be increased to promote the melting of the ash. Further, by adjusting the supply amount of the methane gas to the melting chamber 2a, the combustion temperature can be controlled, which contributes to stable operation. Furthermore, since the dewatered cake, which is a solid component, is supplied to the gasifier 1 from the solid content utilization line 51b, the combustible component discharged by the separated water can be recovered by heat. Further, since the waste liquid, which is a non-combustible component, is sprayed into the secondary combustion chamber of the combustion melting furnace 2 and incinerated, it can be deodorized and can be safely treated, without imposing a burden on a wastewater treatment facility.

Since the metals mixed into the waste are removed and put into the compression dehydrator, the metal is not damaged by the metal, and the removed metal is mixed with the dewatered waste and mixed into the gasification furnace 1. Since the waste is put in, waste attached to the metals can be incinerated and removed, and the metals can be recovered in a clean state and used effectively.

In the first embodiment,
Although a methane fermentation tank 52 was provided in the separation water treatment line 51,
The methane fermentation tank 52 may be omitted from the separated water treatment line 51.

Next, a waste supply facility in a gasification and melting facility according to a second embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 3, the gasification and melting facility includes a gasification furnace 101 for thermally decomposing waste, and a combustion and melting furnace 102 for melting ash with a pyrolysis gas discharged from the gasification furnace 101. I have. This combustion melting furnace 102
Melting part 1 that burns unburned components such as pyrolysis gas and char
02a, a communication section (slag recovery section) 102c for heating and melting ash entrained in the pyrolysis gas by combustion heat to capture and collect as slag, and a secondary combustion section 102b for completely burning exhaust gas. ing.

The gasification and melting equipment mainly dewaters the waste put in the refuse hopper 103 by a first compression dehydrator 104, which is a mechanical first dewatering means, to convert the waste into primary dewatered waste. A primary dewatering waste supply line 105 for supplying to the furnace 101, and a primary separated water for sending primary separated water separated from the first compression dehydrator 104 to a second compression dehydrator 106, which is a mechanical second dehydrator. Outgoing line 107
And a secondary dewatering waste supply line 108 for supplying the secondary dewatering waste separated by the second compression dehydrator 106 to the gasification furnace 101, and a secondary separation separated by the second compression dehydrator 106. A secondary separation water treatment line 109 for supplying water to the combustion melting furnace 102 for incineration.

In the primary dewatering waste supply line 105, a crusher 110 as crushing means for roughly crushing garbage as waste, and garbage into dry waste and wet waste are arranged in order from the upstream side. A wind separator 111 which is a dry / wet separating means for separating, a magnetic separator 112 which is a metal separating means for removing metals (more precisely, iron) from the inside, and a wet waste is heated while being stirred and mechanically compressed and dewatered. And a first dehydrator 104 that separates the primary dewatered waste and primary separated water into primary dewatered waste, primary dewatered waste, dried waste, metals removed by the magnetic separator 112, and the like. There is provided a quantitative supply feeder 113 which is a quantitative supply means for guiding secondary dewatering wastes to be described later, mixing them, and sending the mixed wastes to the gasification furnace 101 in fixed amounts.

The dried waste separated by the wind separator 111 is supplied from a dried waste line 111a to an inlet of a fixed feeder 113. Further, a large amount of waste is attached to the metals removed by the magnetic separator 112 and is not suitable for reuse as it is.
After incineration and removal of waste, take it out and reuse it. Therefore, the metals removed by the magnetic separator 112 are:
It is supplied from the magnetic separator 112 to the inlet of the fixed-quantity feeder 113 by the metal merging line 112a.

Further, the combustion melting furnace 102 has a secondary combustion section 1
A heat recovery unit 114 is disposed on the outlet side of 02b, and the exhaust gas after heat recovery is detoxified by an exhaust gas treatment device 115 and discharged from a chimney 116. The steam heated by the heat recovery unit 114 is introduced into a steam turbine 117a of a power generation facility 117 by a steam supply pipe 114a, and a generator 118 is driven to generate power.

The primary separated water separated from the wet waste by the first compression dehydrator 104 has a solid content of 10 to 30%.
% Solids content, the primary separation water is:
Second compression dewatering machine 1 through primary separation water delivery line 107
The second compressed dewatering machine 106 separates the second dewatered waste containing the solid content and the second separated water. The secondary dewatering waste is supplied to the gasification furnace 101, while the secondary separated water is supplied to the secondary combustion section 102b of the combustion melting furnace 102.

As shown in FIG. 4, the first compression dehydrator 104 has a waste casing inlet 122 formed at one end of a cylindrical casing 121 and an outlet 124 provided at the other end. . A screw 125 with a shaft is rotatably disposed in the casing 121 at the axis thereof. The screw 125 is rotationally driven by a dehydration rotary drive device (hydraulic or electric motor) 127 via a speed reducer 126. You. The casing 121 has an inlet 12
2, the transfer unit A, the dewatering unit B,
A dehydration adjusting section C and an extruding section D are formed.

That is, in the casing 121, the transfer section A, the dewatering section B, and the dewatering adjusting section C are formed in a cylindrical straight cylindrical section 121a having a constant internal cross section. Formed in the tapered cylindrical portion 121b. Further, the helical screw blades of the screw 125 are moved in the transfer section A, the dehydration section B and the dehydration adjustment section C.
It is formed on a straight blade 125A having a constant outer diameter, and is formed on a tapered blade 125B having a smaller outer diameter toward the discharge port 124 in the extruded portion D. And the transfer section A
Then, in the cross section in the casing 121a, the screw 1
The 25 shaft portions are formed on the small-diameter small-diameter shaft 125a, and the cross-section of the transfer space obtained by subtracting the cross-section of the small-diameter shaft 125a from the inner cross-section of the casing 121a is formed to be constant.
In the dewatering section B, the shaft of the screw 125 is
A tapered shaft 125b having a tapered shape having a larger diameter from the input port 122 side to the discharge port 124 side, and a large-diameter shaft 125c straight on the discharge port 124 side from the tapered shaft 125b. The waste is compressed and dehydrated by squeezing the waste water toward the outlet 124 side, and the primary separated water is drained from a plurality of dehydration holes 128 formed in the casing 121. Further, in the extruded portion D, the casing 121 is formed in a conical tapered cylindrical portion 121b having a smaller diameter toward the discharge port 124, and a plurality of dehydration holes 128 are also formed in the tapered cylindrical portion 121b.
The size of the diameter of these dewatering holes 128 is, for example, about 10 mm. The shaft of the screw 125 in the extrusion portion D is also formed with a conical shaft 125e having a sharp point on the discharge port 124 side, and a tapered blade 125B is protrudingly provided.
29 are provided. After the waste in the first compression dewatering machine 104 is compressed by the dewatering part B by the extrusion part D,
Further compression can be performed continuously, that is, compression dehydration can be performed in two stages.

The screw 12 in the dehydration adjusting section C
5 is a spiral blade 125, as shown in FIGS.
A is removed to form a small-diameter support shaft 125d, and a ring-shaped fixed adjustment plate 131 is externally fitted to the small-diameter support shaft 125d via a bearing 133. Movable adjustment plate 13 rotatable in range
2 are fitted outside in an overlapping state. When the fixed adjustment plate 131 is fixed to the casing 121,
The screw 125 is supported via the bearing 133. The adjusting plates 131 and 132 have cocoon-shaped communication holes 131a and 132a overlapping each other at a predetermined opening ratio and at predetermined angles. Therefore, the adjustment driving device 13
4 by be to rotated by a predetermined angle in the direction of the arrow a movable adjustment plate 132 with respect to the fixed adjustment plate 131, overlapping the communicating hole 131a, to increase the compressive force squeezing the opening area E _L of 132a to E _S, discards A lot of water can be dehydrated from objects. In the drawing, the adjustment driving device 134 includes a sector gear 134a formed on the movable adjustment plate 132, a pinion 134b meshing with the sector gear 134a, and an adjustment driving device 134c disposed on the casing 121 and rotating the pinion 134b. However, as long as the movable adjustment plate 132 can be rotated within a predetermined range, an actuator or a hydraulic cylinder may be used, or the movable adjustment plate 132 may be manually rotated.

The casing 121 has a drainage cover 1 covering the dewatering holes 128 formed in the dewatering section B and the extruding section D.
The primary separation water drained from the dewatering hole 128 can be drained from the drain port 141a.

An arbitrary portion or the entirety of the dewatering hole 128 is provided with a blockage prevention device 142 for removing the blocked waste.
Is provided. As shown in FIG. 7, the blockage prevention device 142 covers the dewatering hole 128 and drains the water.
a, a cylindrical cover 143 having a
A revolving screw 144 which is a revolving member rotatably disposed at an axial position supported on a bottom plate via a bearing therein;
A screw driving device 145 such as an electric motor for rotating the turning screw 144 at a low speed in a forward direction (a direction of discharging out of the casing) or in a reverse direction (a direction of pushing back into the casing) is provided. By rotating at a low speed in the direction, debris in the dewatering hole 128 can be drawn out and clogging can be prevented. When the turning screw 144 is rotated at a low speed in the forward direction, a small amount of dust is drawn into the cylindrical cover 143, but there is no problem in the dewatering function. In addition, turning screw 1
Waste can be prevented from being discharged by the resistance caused by 44 itself. Of course, the waste can be pushed back by rotating the turning screw 144 in the reverse direction at a low speed.

As shown in FIG. 8, the second compression dehydrator 106 has an inlet 14 for the primary separated water separated by the first compression dehydrator 104 at one end of a cylindrical casing 146.
7 are formed on the other end side, and the rear wall portion 162 and the partition plate 16
3 form an outlet 148. In the casing 146, a transfer unit F, a dewatering unit G, and a discharge unit H are formed from the inlet 147 toward the outlet 148. In this casing 146, a screw 149 provided with a spiral screw blade 149A on the outer periphery of a cylindrical shaft is rotatably arranged. The rear end of the screw 149 is supported by the rear wall portion 162, and the front end of the screw 149 is rotationally driven by a dehydration rotary drive device (hydraulic or electric motor) 151 via a speed reducer 150.

The screw 149 passes through the partition plate 163 and has a gap 163 a between the screw 149 and the partition plate 163.
Is provided, and the secondary dewatering waste is discharged from the gap 163a. A push plate 164 is externally fitted to an outer peripheral portion of the screw 149 in the discharge portion H. A connecting member 165 is attached to the push plate 164, and a hydraulic cylinder 166 is attached to the connecting member 165. By driving the hydraulic cylinder 166 to move the push plate 164 forward, the partition plate 163 is moved.
The dewatering is efficiently performed by giving resistance to the secondary dewatering waste discharged from the gap 163a. A plurality of dewatering holes 152 are formed on the lower surface of the casing 146 in the dewatering section G, and secondary separation water is drained from the plurality of dewatering holes 152. The size of the diameter of the dehydration hole 152 is
About 1/10 of the dewatering hole 128 of the first compression dewatering machine 104 described above is optimal, for example, about 1 mm. The casing 146 has a dehydrating hole 152 formed in the dehydrating section G.
A drain cover 153 is provided to cover the dewatering hole 15.
2 can be drained from the drain port 153a.

In the above configuration, the garbage supplied from the garbage hopper 103 is supplied to the primary dewatering waste supply line 10.
At 5, the crusher is first crushed by a crusher 110, then introduced into a wind separator 111, and separated into dry waste and wet waste by separation air. After the metals are removed by the magnetic separator 112, the wet waste is removed by the first compression dehydrator 10
4 through the fixed feeder 113 to the gasifier 101
Is supplied in a fixed amount. The dried waste separated by the wind separator 111 is supplied from the dried waste line 111a to the inlet of the fixed-quantity feeder 113, and further dried by the magnetic separator 1.
The metals removed in 12 are supplied from the magnetic separator 112 to the inlet of the fixed-quantity feeder 113 via the metal merging line 112a.

At this time, in the first compression dehydrator 104,
The waste supplied into the first compression dehydrator 104 is sent from the transfer section A to the dehydration section B by the rotation of the screw 125, and the transport space is reduced by the taper shaft 125b, which is gradually thicker, and compressed and dehydrated. Primary separation water is dehydrated hole 128
Drained from Further, the waste in the first compression dewatering machine 104 is supplied to the dehydration control part C by the communication holes 1 of the adjusting plates 131 and 132.
The cross section of the transport space is narrowed by 31a and 132a and further compressed and dewatered.
9, the water is compressed continuously by the transfer space gradually reduced toward 9 to promote dehydration, while primary separated water is drained from the dewatering hole 128, while primary dewatered waste is discharged from the tip nozzle 129 and gasified. The fixed amount is supplied to the furnace 101.

The primary separated water drained from the dehydration hole 128 is supplied to the primary separated water delivery line 10 through the drain port 141a.
7, and is charged into the input port 147 of the second compression dehydrator 106.

Further, the movable adjusting plate 132 is rotated by a predetermined angle by the adjusting drive device 134 in accordance with the moisture and the type of the waste, and the opening area E of the communication holes 131a, 132a is reduced or enlarged to adjust the compression state. Thereby, the amount of dehydration can be controlled, and the primary dewatering waste with an appropriate amount of water can be supplied quantitatively.

Accordingly, in the first compression dewatering machine 104, the waste is continuously dewatered in two stages before and after the dewatering section B and the extruding section D, so that the waste can be dewatered effectively. Wastes having an initial water content of about 50% can be dehydrated to about 35%.

The dehydration adjusting section C interposed between the dehydrating section B and the extruding section D rotates the movable adjusting plate 132 in accordance with the quality of the waste and the water content during operation, thereby opening the opening. The area E can be adjusted, the dewatering state can be easily controlled, the waste with uniform moisture content can be supplied to the gasification furnace 101, and the gasification furnace 101 can be stably operated. Further, even when the load increases due to a rapid change in the quality of the waste and the motor is likely to trip (stop), the load can be reduced in a short time by increasing the opening area E by the dehydration adjusting unit C. It can be lowered and stable operation can be continued.

Further, the blockage preventing device 14 is
By providing 2, the clogging can be easily released by rotating the turning screw 144 even when the amount of drainage decreases due to clogging according to the dehydration state.

Then, the primary separated water separated by the first compression dehydrator 104 is introduced into the inlet 147 of the second compression dehydrator 106 via the primary separated water delivery line 107, By the rotation of the screw 149 of 106, it is sent from the transfer part F to the dewatering part G, and further compressed and dewatered by the helical screw blade 149A,
Secondary separation water as waste liquid is drained from the dehydration hole 152.
Then, the secondary separation water drained from the dehydration hole 152 is sent to the secondary combustion part 102b of the combustion melting furnace 102 by the liquid feed pump through the secondary separation water treatment line 109, and is injected into the combustion gas. It is incinerated and deodorized and made harmless. On the other hand, the secondary dewatering waste is discharged from the gap between the casing partition plate 163 and the screw 149, and the push plate 163 that can move back and forth adjusts the discharge amount of the secondary dewatering waste to perform dehydration efficiently. . The secondary dewatering waste is supplied to the inlet of the fixed-quantity feeder 113 via the secondary dehydration waste supply line 108, and is supplied to the gasification furnace 10
The fuel is burned at 1 and is effectively used as a heat source.

In the gasification furnace 101, the waste supplied from the fixed-quantity feeder 113 is stirred and heated together with the fluid medium, and is thermally decomposed (dry-dried) in a state of insufficient air. Then, the metals input together with the waste are discharged together with the fluid medium after the attached waste is incinerated and separated into the fluid medium and the metals by the separation device 154, and the fluid medium passes through the medium circulation line 155. Through the gasifier 101
And the metals are recycled.

The pyrolysis gas containing unburned components, char and the like discharged from the gasification furnace 101 is sent to the melting part 102a of the combustion melting furnace 102, where it is burned at a high temperature, and the communication part 102c
Ash in the molten state (molten slag) and the like entrained by the slag are captured. After the secondary separation water is completely burned in the secondary combustion section 102b and the injected secondary separation water is incinerated, the combustion exhaust gas is sent to the heat recovery unit 114 for heat recovery. After being converted, it is discharged from the chimney 116. The steam heated by the heat recovery unit 114 is sent to a steam turbine 117a of a power generation facility 117 and used for power generation. In addition, a part of steam is branched into a steam pipe 1
19, it can be sent to the first compression dewatering machine 104 and used for heat dewatering of garbage.

According to the second embodiment, after the waste is separated into the dry waste and the wet waste by the wind separator 111, the wet waste is dehydrated by the first compression dewatering machine 104. Irrespective of the water content of the gasification furnace 101, the water content of the waste supplied to the gasification furnace 101 can be made low and substantially uniform. Further, the primary separated water separated from the waste by the first compression dehydrator 104 is further separated into a secondary dewatered waste containing solids and a secondary separated water by a second compression dehydrator 106, and this secondary separated water is separated. Since the dewatered waste is supplied from the secondary dewatered waste supply line 108 to the gasification furnace 101, heat recovery of solids, which are combustible components, can be performed. Further, the secondary separation water containing the organic component is supplied to the secondary combustion section 1 of the combustion melting furnace 2.
Since it is sprayed on 02b and incinerated, it can be deodorized and can be safely treated, and does not impose a burden on a wastewater treatment facility.

Since the metals mixed in the waste are removed and put into the first compression dehydrator 104, the first compression dehydrator 1
04 is not damaged by the metal, and the removed metals are mixed with the dewatered waste and charged into the gasification furnace 101, so that the waste attached to the metals can be incinerated and removed. Can be collected in a clean state and used effectively.

FIG. 9 shows the first embodiment according to the second embodiment.
It shows a modification of the blockage prevention device of the compression dehydrator. That is, the blockage prevention device 156 is
Hawk-shaped revolving member 1 rotatably supported on 7
58 is connected and interlocked via an interlocking mechanism 159 including a pulley and a belt, is turned by a turning member driving device 160 such as an electric motor, and is driven through a movable base 157 by an extension device 161 such as a fluid pressure cylinder and an actuator. The rotating member 158 is configured to move back and forth into the dewatering hole 128. In addition, this turning member 15
8 may also be a turning screw 144.

In the blockage prevention device 156, at every predetermined working time or according to the drainage state of the primary separated water,
By rotating the turning member 158 by the turning device 160 and inserting the turning member 158 into the dewatering hole 128 by the retracting device 161, waste clogged in the dewatering hole 128 is removed, blockage is prevented, and drainage is promoted. be able to.

Further, the waste supply equipment according to the second embodiment is provided with a methane fermentation system in which primary separated water dewatered and separated by the first compression dehydrator 104 is processed by the second compression dehydrator 106. The required installation area, initial cost, and running cost can be reduced as compared with the case of processing in a tank.

[0069]

As described above, according to the waste supply method in the gasification and melting facility according to the first aspect, the separated water dewatered and separated can be treated in the gasification and melting facility. This eliminates the need for a wastewater treatment facility, and allows the combustible components contained in the separated water to be effectively used as a heat source for the gasification and melting facility, thereby efficiently treating the separated water.

Further, according to the waste supply equipment in the gasification and melting equipment according to the fifth aspect, the separated water separated by the dewatering means can be treated by the gasification and melting equipment, so that no wastewater treatment equipment is required. become. In the separation water treatment line, the combustible components contained in the separated water can be separated and burned by gasification and melting equipment to be used effectively as heat energy, while the non-combustible components are incinerated. It can be removed and the separated water can be treated effectively.

Further, according to the waste supply method in the gasification and melting equipment according to the second aspect, methane gas is fermented from the separated water and this methane gas is used as a heat source of the combustion and melting furnace. The temperature of the combustion melting furnace can be controlled by adjusting the supply amount.

Further, according to the waste supply equipment in the gasification and melting equipment according to the sixth aspect, methane gas is fermented from the separated water by the methane gas fermentation means, and this methane gas is supplied to the combustion melting furnace via a gas utilization line. Since the fuel is burned, it can be used as heat energy of the combustion melting furnace, and the temperature of the combustion melting furnace can be controlled by adjusting the supply amount.

According to the third aspect of the present invention, the solid content contained in the separated water is separated, put into the gasification furnace and thermally decomposed. The portion can be used as a heat source, and resources can be effectively used. In addition, since the wastewater after the solid content separation is incinerated in a combustion melting furnace, the odor and harmful components can be reliably decomposed and rendered harmless.

Further, according to the waste supply equipment in the gasification and melting equipment according to claim 7, the solids separated from the separated water by the solid-water separation means are fed into the gasification furnace through the solids utilization line. Since incineration is performed, the solids contained in the separated water can be used as a heat source, and resources can be effectively used. Further, since wastewater is incinerated in a combustion melting furnace through a wastewater treatment line, it is possible to surely decompose and detoxify odorous components and harmful components.

Further, according to the waste supply method in the gasification and melting facility according to the fourth aspect, the metals removed from the waste before dehydration are supplied to the gasification furnace together with the waste after dehydration. Without damaging the dehydrator, incineration of waste attached to metals and discharge and separation from the gasification furnace together with the fluidized medium allows recovery of metals in a clean state, facilitating reuse. be able to.

Further, according to the waste supply equipment in the gasification and melting equipment according to claim 8, metals are removed by the metal separation / separation means at the inlet side of the dehydration means, and the metals are mixed with the dewatered waste. Since the gas is supplied to the gasification furnace, the waste attached to the metal can be incinerated and removed, and the metal can be recovered from the gasification furnace in a clean state, and the reuse can be facilitated.

Further, according to the waste supply method in the gasification and melting facility according to the ninth aspect and the waste supply facility in the gasification and fusion facility according to the tenth aspect, the waste is dehydrated by the first dehydrating means to perform primary dehydration. Separated into waste and primary separated water, this primary dewatered waste is put into a gasifier,
Since the primary separated water is further dewatered by the second dewatering means and separated into secondary dewatered waste and secondary separated water, wastewater treatment equipment is not required, and the secondary dewatered waste is put into a gasification furnace. Because it is thermally decomposed, it is possible to use resources contained in the secondary dewatering waste as a heat source to effectively use resources.
Furthermore, since the secondary separation water is incinerated in a combustion melting furnace, it is possible to reliably decompose and deodorize odorous and harmful components. In addition, since the primary separated water separated by the first dewatering unit is treated by the second dewatering unit, the required installation area, initial cost, and running cost can be reduced as compared with the case of treating in a methane fermentation tank, for example. Can be

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a gasification and melting facility according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a compression dehydrator in the gasification and melting facility.

FIG. 3 is a configuration diagram illustrating a gasification and melting facility according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a first compression dehydrator in the gasification and melting facility.

FIG. 5 is a transverse cross-sectional view showing an enlarged state of an opening of a dehydration adjusting section of the first compression dehydrator.

FIG. 6 is a cross-sectional view showing a reduced state of an opening of the dehydration adjusting unit.

FIG. 7 is a cross-sectional view showing a blockage preventing device of the dehydration adjusting unit.

FIG. 8 is a longitudinal sectional view showing a second compression dehydrator in the gasification and melting facility.

FIG. 9 is a side view showing a modification of the blockage prevention device of the dehydration adjusting section of the first compression dehydrator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gasification furnace 2 Combustion melting furnace 2a Melting part 2b Secondary combustion part 3 Waste supply line 3a Dry waste line 3b Metal merging line 4 Garbage hopper 5 Crusher 6 Wind separator 7 Magnetic separator 8 Compression dehydrator 9 Quantitative supply Feeder 51 Separated water treatment line 51a Gas utilization line 51b Solid content utilization line 51c Wastewater treatment line 52 Methane fermentation tank 53 Centrifuge 54 Dehydration liquid tank 55 Liquid feed pump 101 Gasification furnace 102 Combustion melting furnace 102a Melting part 102b Secondary combustion Unit 103 Waste hopper 104 First compression dehydrator 105 Primary dehydration waste supply line 106 Second compression dehydrator

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B09B 3/00 F23G 5/00 115Z F23G 5/00 ZAB 5/027 ZABZ 115 5/16 ZABB 5/027 ZAB B09B 3/00 ZAB 5/16 ZAB 303K 303L (72) Katsuhiko Yamamoto 1-89, Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Hitachi Zosen Corporation (72) Chiaki Tojo Suminoe-ku, Osaka-shi, Osaka 1-89 Minami Kohoku, Hitachi Zosen Corporation (72) Inventor Minoru Akita 1-7-89 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Hitachi Zosen Corporation (72) Inventor Ichiro Sugimoto Osaka-shi, Osaka 1-7-89 Minami Kohoku, Suminoe-ku Inside Hitachi Zosen Corporation

Claims (10)

[Claims] 1. Waste supply in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas and melting entrained ash and unburned components. A method in which waste is dehydrated by mechanical dehydration means, then charged into a gasification furnace, and the separated water discharged from the dehydration means is separated into combustible and non-combustible components, and the combustible components are gasified. A method for supplying waste in a gasification and melting facility, comprising supplying to a furnace and a combustion melting furnace for combustion, and supplying an incombustible component to the combustion and melting furnace for incineration. 2. The gas according to claim 1, wherein the combustible component is methane gas fermented from separated water, and the methane gas is introduced into a melting chamber of a combustion melting furnace to be used as a heat source for melting ash. Waste supply method for chemical melting equipment. 3. The combustible component is a solid content separated from methane gas and separated water, and the solid content is supplied to a gasification furnace to be thermally decomposed. 3. The method for supplying waste in a gasification and melting facility according to claim 2, wherein the waste is put into a furnace and incinerated. 4. Waste supply in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas and melting entrained ash and unburned components. A method for separating and separating metals from waste, mechanically dewatering the waste, mixing the metal with the dehydrated waste, and supplying the mixed gas to a gasification furnace. Waste supply method in melting equipment. 5. A waste gas supply facility in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas to melt accompanying ash and char. In the waste supply line from the waste hopper to the gasifier,
Dewatering means for mechanically dewatering waste is provided. Separated water separated by this dewatering means is separated into combustible components and non-combustible components, and the combustible components are supplied to a combustion melting furnace and a gasification furnace for use. A wastewater supply facility in a gasification and melting facility, comprising a separated water treatment line for supplying an incombustible component to a combustion melting furnace for incineration treatment. 6. A methane gas fermenting means for generating methane gas from the separated water in a separated water treatment line, wherein the methane gas generated by the methane gas fermenting means is
6. A waste supply facility in a gasification and melting facility according to claim 5, further comprising a gas utilization line for supplying the gas to the melting chamber of the combustion and melting furnace for combustion. 7. A separated water treatment line is provided with solid water separating means for separating separated water into solids and waste liquid, and the solids separated by the solid water separating means are supplied to a gasification furnace. A wastewater separated in the gasification and melting facility according to claim 5 or 6, wherein a line is provided, and a separated water treatment line is provided for injecting a waste liquid separated by the solid-water separation means into a combustion melting furnace to incinerate the wastewater. Supply facilities. 8. A waste gas supply facility in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas to melt accompanying ash and char. In the waste supply line from the waste hopper to the gasifier,
Dewatering means for dewatering the waste is provided. At the inlet side of the dewatering means, metal separating means for separating metals from the waste is provided, and the separated metals are dewatered waste discharged from the dewatering means. A waste supply facility in a gasification and melting facility, which comprises a metal merging treatment line for mixing and supplying the mixture to a gasification furnace. 9. Waste supply in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas and melting entrained ash and unburned components. The method comprises the steps of: dewatering waste by mechanical first dewatering means to separate it into primary dewatered waste and primary separated water; introducing the primary dewatered waste into a gasification furnace; It is further dewatered by mechanical second dewatering means to separate it into secondary dewatered waste and secondary separated water. The secondary dewatered waste is supplied to a gasification furnace, and the secondary separated water is supplied to a combustion melting furnace. A waste supply method in a gasification and melting facility, wherein the waste is supplied and incinerated. 10. A waste gas supply facility in a gasification and melting facility comprising a gasification furnace for thermally decomposing waste and a combustion and melting furnace for burning the pyrolysis gas to melt accompanying ash and char. A first dewatering means for mechanically dewatering the waste and separating it into primary dewatered waste and primary separated water in a primary dewatered waste supply line from the refuse hopper to the gasification furnace; Second dewatering means is provided for mechanically dewatering the primary separated water separated by the dewatering means into secondary dewatered waste and secondary separated water, and supplies the dewatered waste to a gasification furnace. A waste supply facility in a gasification and melting facility, wherein the secondary separated water is supplied to a combustion and melting furnace for incineration.