JP2000283436A - Method and system for treating waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the energy utilizing efficiency of refuse by a method wherein a treatment amount per unit time of waste is increased in a way that a chlorine content is removed from gasified gas of waste and burnt by an exhaust heat recovery boiler. SOLUTION: Char (carbide) T of waste H is mixed with coal C and the mixture is burnt by a thermal power generating device X to treat the waste H. In a method described above, the thermal power generating device X comprises coal gasifying equipment 1 to generate combustible gas F for driving a gas turbine 4; an exhaust heat recovery boiler 8 to generate steam for driving a steam turbine 9 by burning combustible gas F. Gasified gas B and the char T are generated from the waste H by a gasifying furnace 13. The char T is separated away from the gasified gas B by a separation device 14 and mixed with the coal C through a conveyance route 15. A chlorine content is removed from the gasifeid gas B by a chlorine removing device 16, and dechlorined gasified gas E is burnt by a heat source device 19 and forms a heat source for an exhaust heat recovery boiler 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a system for treating waste by carbonizing the waste and burning the carbide in a thermal power plant, and more particularly, to a part of chlorine contained in the waste. The present invention relates to a technique of burning in a thermal power generation device in a state in which the gas is removed. In this specification, waste is used to include municipal waste such as paper and waste plastic, and biomass-based industrial waste such as straw, wood chips and waste pulp.

[0002]

2. Description of the Related Art In recent years, it has been proposed to reuse municipal waste such as paper and waste plastic, and biomass-based industrial waste such as straw, wood chips and waste pulp as various fuels. It is expected that the energy utilization efficiency of the product will increase. For this reason, boiler power generation using a garbage incinerator has also been proposed, but hydrogen chloride generated during garbage incineration corrodes the boiler tubes, making it impossible to operate the boiler under severe conditions, and the garbage contains a lot of moisture. Therefore, the power generation efficiency is poor due to the low combustion temperature.
Furthermore, disposal of ash generated by garbage incineration requires enormous costs and is not economical.

[0003] Therefore, it is conceivable to use the waste as fuel for a coal-fired business boiler or a coal gasification facility already installed in a thermal power plant, thereby eliminating the need for an incinerator for waste treatment. However, it is difficult to put waste directly into such commercial boilers. This is because commercial boilers and the like are difficult to directly burn waste due to the structure of the burner and the like, and the quality of fuel is strictly controlled to control exhaust gas and prevent corrosion of boiler tubes. The problem is that it is not possible to deal with unstable urban garbage.

Japanese Patent Application Laid-Open No. Hei 10-244176 discloses a technique in which organic waste such as waste plastic is used as fuel for a coal-fired boiler. This is because the organic waste is previously stored in an oxygen-deficient atmosphere for 200 to 50 days.
Heat treatment in a temperature range of 0 ° C., the gas generated by this heat treatment is burned in a boiler, and after the heat treatment, solids (so-called carbides mainly composed of carbon) pulverized by a roller mill are mixed with coal as fuel. And burn it in a boiler.

[0005]

By the way, in the above-mentioned waste, chlorine existing in a high molecular chlorine resin such as vinyl chloride and chlorine existing in sodium chloride and calcium chloride are included. Yes (the former is referred to as organic chlorine and the latter is referred to as inorganic chlorine for the sake of convenience in the present specification), and it can be considered that these organic chlorine and inorganic chlorine are present in a ratio of about half. The pyrolysis gas generated in the process of heat treatment of the waste, that is, carbonization by pyrolysis, contains 80 to 90% of the organic chlorine as hydrogen chloride, and this pyrolysis gas is used for business such as thermal power plants. If a large amount is burned in a boiler or the like, the burner may malfunction or the boiler tube may be corroded, so that only a small amount can be burned.

On the other hand, the carbides obtained after the heat treatment of wastes are similar in properties such as the calorific value, specific moisture, and volatility to coal, so that, for example, a fuel such as an existing coal-fired boiler for a thermal power plant is used. It is possible to mix in and burn. However, most of the inorganic chlorine remains in the carbonized waste, and although the properties such as the calorific value are similar to coal, they differ in that they contain much more chlorine than coal. I have. Therefore, if this carbide is used as fuel for a commercial boiler, the same causes the malfunction of the burner and the corrosion of the boiler tube as described above, so that it can be mixed into the coal little by little.

[0007] As described above, in view of the fact that chlorine has a great effect on fuel whose quality is strictly controlled, such as a boiler for a coal-fired business, waste is subjected to heat treatment, and the heat treatment process is performed. In order to properly burn the pyrolysis gas and carbide generated in the above in a commercial boiler, waste (pyrolysis gas and carbide) should be mixed with coal in order to avoid malfunction of the burner and corrosion of the boiler tube. Just one
%, And the chlorine content in the whole must be made very small. As a result, the amount of waste processed per unit time is reduced, and the above-described improvement in the energy use efficiency of garbage cannot be achieved.

Further, since chlorine is contained in exhaust gas after combustion in a commercial boiler, it is necessary to add a chlorine removal function to an exhaust gas treatment facility in order to satisfy exhaust gas regulations. However, adding a chlorine removal function to a large exhaust gas treatment facility in order to remove a small amount of chlorine contained in the exhaust gas is not preferable in terms of cost. In addition, dust generated in the process of treating flue gas from a coal-fired boiler can be reused on the premise that it can be obtained by burning only coal. Such as the need to remove chlorine from dust,
This will reduce the value of dust recycling.

The present invention has been made to solve the above-mentioned problems, and in addition to burning carbonized waste in a coal gasification facility, removing the chlorine content from the gasified gas generated in the step of carbonizing the waste. Combustion by the waste heat recovery boiler attached to the coal gasification facility reduces the amount of chlorine input to the coal gasification facility and the waste heat recovery boiler, thereby reducing the amount of waste processed per unit time. It is intended to increase the energy use efficiency of garbage.

[0010]

In order to achieve the above object, the invention according to claim 1 is characterized in that waste is carbonized, the carbide is mixed with coal, and the waste is combusted by a thermal power plant to dispose of the waste. A method for treating objects, wherein as a thermal power generation device, a coal gasification facility that generates flammable gas for driving a gas turbine for power generation, and steam for power generation using flammable gas from the gas turbine A gasification step of generating a gaseous gas containing chlorine and a carbide by partially burning waste in a gasification furnace using a waste heat recovery boiler that generates steam for driving a turbine; and , A separation / mixing step of separating the fine powdery carbide mixed in the gasification gas and mixing the carbide with the coal, and a dechlorination gasification gas by removing at least chlorine from the gasification gas after the separation step. Generate And chlorine removal step, technique and a combustion step of the heat source of the exhaust heat recovery boiler by burning the dechlorination gasification gas is employed. In this waste treatment method, the waste is converted into carbide and gasified gas by a gasifier,
Since the carbides are combusted in the coal gasification facility, chlorine is removed from the gasified gas, and this is burned in a waste heat recovery boiler to use as the heat source, so the organic chlorine contained in the gasified gas is converted to coal gasification. The amount of charcoal that can be burned in the coal gasification facility can be burned by the coal gasification facility without being fed into the facility or waste heat recovery boiler, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of waste. Improvement can be achieved. In addition, since the gaseous gas is burned after separating the finely powdered carbide mixed in the gasified gas, it is possible to avoid the influence of the carbide during the combustion of the gasified gas and to carry out stable combustion. Thus, it is possible to reduce the adverse effect on the combustion burner. further,
Since the chlorine content in the gasified gas is removed in the chlorine removal step, at least a part of the chlorine content contained in the waste is efficiently removed.

According to a second aspect of the present invention, in the waste disposal method of the first aspect, in the chlorine removing step, a technique of removing sludge by adding slaked lime to the gasified gas is applied. In this waste treatment method, by adding slaked lime to the gasified gas, organic chlorine (hydrogen chloride) and slaked lime (calcium hydroxide) in the gasified gas react with each other, and the reaction product is removed, thereby improving efficiency. It is possible to remove chlorine from gasified gas.

According to a third aspect of the present invention, there is provided a system for treating waste by carbonizing waste, mixing the carbonized material with coal, and burning the mixture with a thermal power generator. A coal gasification facility that generates flammable gas to drive a gas turbine for use with a waste heat recovery boiler that generates steam to drive a steam turbine for power generation using flammable gas from the gas turbine. A gasification furnace that generates a gasified gas containing chlorine and a carbide by partially burning waste, a separation device that separates fine powdery carbide mixed in the gasification gas, and a separation device A transport path for mixing the carbides separated in the coal with coal to the coal gasification facility, and a chlorine removal device that removes at least chlorine from the gasified gas that has passed through the separation device and generates a dechlorinated gasified gas. Technique and a heat source apparatus for a heat source of the exhaust heat recovery boiler by burning the dechlorination gasification gas is employed. In this waste treatment system, waste gas is converted into carbonized gas and gasified gas by a gasifier, and the carbonized material is combusted in a coal gasification facility, and chlorine is removed from the gasified gas to remove it from the thermal power plant. Organic chlorine contained in the gasification gas is not injected into the coal gasification facility or waste heat recovery boiler because it burns in the recovery boiler as a heat source, and more carbon is burned in the coal gasification facility by that amount As a result, the amount of waste processed per unit time can be increased, and the energy use efficiency of garbage can be improved. In addition, since the fine powdery carbides mixed in the gasified gas are removed by the separation device, it is possible to avoid the influence of the carbides during the combustion of the gasified gas, to carry out stable combustion, and to use a combustion burner or the like. It is possible to reduce the adverse effect on the environment. Further, since the chlorine content in the gasified gas is removed by the chlorine removal device, at least a part of the chlorine content contained in the waste is efficiently removed.

[0013]

1 and 2 show an embodiment of the present invention.
This will be described with reference to FIG. The waste treatment system shown in FIG. 1 is a thermal power generation device that converts municipal waste such as paper and waste plastic, and biomass-based industrial waste (waste in this specification) such as straw, wood chips, and waste pulp. X is to be burned in the coal gasification facility 1. FIG. 1 shows a flow diagram of the waste treatment, in which solid arrows indicate flows of solids and liquids, and dotted lines (including dashed lines and two-dot chain lines) indicate flows of gas. The thermal power generator X shown in FIG. 1 is a so-called integrated coal gasification combined cycle facility, and includes a mill 2, a coal gasification facility 1, a gas purification apparatus 3, a gas turbine 4 for power generation, a generator 5, a compressor 6, and air separation. Device 7, waste heat recovery boiler 8, steam turbine 9 for power generation, condenser 10,
It is schematically configured by an exhaust gas treatment device 11.

First, coal C as a fuel is supplied to a wet mill 2
(However, installation of the mill 2 is optional.) And the mixture is charged into a gasification furnace (not shown) of the coal gasification facility 1. Then, the coal C is gasified in the coal gasification facility 1, and as the coal C, from low-grade coal to anthracite can be gasified in the same furnace.

By the way, the gasification of coal C is performed by
By supplying about half the amount of oxygen required for complete combustion of the coal C to the gasifier, the coal C is partially burned to generate a flammable gas F containing carbon monoxide or hydrogen as a main component. Process. At this time, by adding water to the coal C to form a fuel slurry, water in the slurry reacts with carbon to cause a water gasification reaction, thereby promoting gasification. The ash generated in the coal gasification facility is
Discharged as glassy slag.

The high-temperature and high-pressure combustible gas F generated in the coal gasification facility 1 is sent to a gas purification device 3. The gas purification device 3 includes a desulfurization device such as a desulfurization tower for collecting sulfur, a dust removal device such as a filter, and the like, and performs high-temperature dry treatment of the combustible gas F. In the gas purifier 3, the foreign matter removed from the combustible gas F by the dust remover is discharged as dust.

The combustible gas F purified by the gas purifier 3 is supplied to the gas turbine 4 at a high temperature and a high pressure. The gas turbine 4 has a rotating shaft 4a connected to the generator 5, and rotates by receiving the pressure of the combustible gas F to drive the generator 5 via the rotating shaft 4a to generate power. At the same time, the compressor 6 disposed on the rotating shaft 4 a of the gas turbine 4 is driven to compress the air and send it to the air separation device 7. The air separation device 7 generates oxygen for partially combusting coal in the coal gasification facility 1 and employs a high-pressure cryogenic separation method of separating compressed air into oxygen and nitrogen using a rectification column. The generated oxygen is supplied to the gasifier of the coal gasifier 1.

The combustible gas F after driving the gas turbine 4 is sent to an exhaust heat recovery boiler 8 and burned by a burner or the like and used as a heat source of the exhaust heat recovery boiler 8. The steam generated in the exhaust heat recovery boiler 8 is sent to a steam turbine 9 arranged on a rotating shaft 4a of the gas turbine 4 to rotate it. Therefore, when the steam turbine 9 rotates, the generator 5 is driven via the rotating shaft 4a to generate power.

The steam after driving the steam turbine 9 undergoes heat exchange with the cooling water in the condenser 10 to become ascites and is returned to the exhaust heat recovery boiler 8. Further, a part of the ascites cooled by the condenser 10 is sent to the coal gasification facility 1 and converted into steam by using the coal gasification facility 1 (gasification furnace) as a heat source. It is sent to the turbine 9.

As described above, the thermal power generation device X generates power by the generator 5 by the rotation of the gas turbine 4 by the pressure of the combustible gas F and the rotation of the steam turbine 9 by the steam. Since the steam turbine 9 is further driven by the steam obtained by the combustion of the driven combustible gas F and the heat of the gasification furnace of the coal gasification facility 1, the heat efficiency is high, and the power can be generated with high efficiency.

The exhaust gas discharged from the exhaust heat recovery boiler 8 is treated by an exhaust gas treatment device 11 and then released to the atmosphere. The exhaust gas treatment device 11 includes the exhaust gas treatment device 11
Is composed of, for example, a gas cooling tower, a dust collector such as a cyclone, a denitrification apparatus employing a dry ammonia catalytic reduction method, a desulfurization apparatus employing a high temperature dry or wet limestone gypsum method, and the like. The dust (coal ash) separated by the exhaust gas treatment device 11 is reused in various ways.

Next, a system for treating waste using the above-described thermal power generator X will be described. Waste H
Is first introduced into the crusher 12 and crushed. At this time, the waste is crushed to about 150 mm or less in order to increase the thermal efficiency in the gasification furnace 13 described later. And
The crushed waste H is sent to the gasification furnace 13. In addition, before sending to the gasification furnace 13, the waste H can be dried (removed of water) by a drier or the like. Normally, it is considered that the waste H such as municipal waste contains about 30% to 60% of moisture, and the moisture may lower the gasification efficiency in the gasification furnace 13 in some cases.

However, in the type using a fluidized bed as the gasification furnace 13 as will be described later, the water content of the waste H can be easily evaporated. It cannot be expected that the efficiency of gasification will improve. Therefore, whether or not the crushed waste H is dried by a dryer or the like is optional. However, other than the type in which the gasification furnace 13 uses a fluidized bed, there is a case where the gasification efficiency can be improved by drying the waste H. In this case, the installation of a dryer or the like is effective. When treating the waste H having a relatively small water content, it goes without saying that the waste H can be naturally dried or can be directly charged into the gasification furnace 13.

FIG. 2 is a schematic view showing an example of the gasification furnace 13 and shows a type using a fluidized bed. The gasification furnace 13 has an air dispersion plate 132 installed in a furnace body 131, a waste input port 133, a bed material input port 134, and a gas discharge port 135 provided above the air distribution plate 132. An air supply port 136 is provided below the dispersion plate 132.
Is provided. Then, the bed material such as sand is supplied from the bed material input port 134 onto the air distribution plate 132 and the air is supplied from the air supply port 136, so that the air is dispersed and ejected from the air distribution plate 132 and the bed material flows. The fluidized bed 137 is formed.

At the time of normal operation, the fluidized bed 137 is in a burning state. When the waste H is charged into the furnace 131 from the waste inlet 133 in this state, the waste H is
The air distribution plate 1 together with the flow of the bed material in the fluidized bed 137
Combustion is carried out by the air sent from 32. At this time, the air supply amount from the air distribution plate 132 is, for example, an air ratio of about 1.0 to 1.3 (normal combustion is about 1.7 to 1.8).
By supplying air in such a manner that the waste H is partially burned (incompletely burned), a combustible gasified gas B such as carbon monoxide and a char (carbide) T are generated (gasification). Process). Since the gasification furnace 13 continuously heats the fluidized bed 137 by the heat of the partial combustion of the waste H, a heat source is unnecessary. Further, the gasification furnace 13 is not limited to the type using a fluidized bed as shown in FIG. 2, but various combustion furnaces capable of partially burning waste H can be applied.

Then, the gasification furnace 13 partially burns the waste H as described above to form the gasification gas B and the char T
Is generated, and the gasified gas B is discharged from the gas discharge port 135. At this time, the char T flows together with the bed material in the fluidized bed 137 and is further crushed into a fine powder, and the fine powder T is mixed with the gasified gas B in the flow of the gasified gas B. With gas outlet 13
Exhausted from 5 It has been described above that in the waste H, the organic chlorine such as vinyl chloride and the inorganic chlorine such as sodium chloride are present in approximately half the ratio. And
About 90% of the organic chlorine is contained in the gasified gas B as hydrogen chloride, and the remaining organic chlorine and inorganic chlorine remain in the char T without being decomposed even after the partial combustion. I have.

In some cases, non-combustible materials such as aluminum cans, iron cans, rubble, and metal wires are mixed in the waste H.
These incombustibles are crushed by the crusher 12 and then charged into the gasification furnace 13 as they are, stay while flowing together with the fluidized bed 137, and discharged from the furnace 131 together with the discharge of the bed material. The fluidized bed 137 is replaced by introducing a new bed material from the bed material inlet 134 while periodically or appropriately discharging the bed material from the furnace 131,
Incombustibles are collected by using the discharge of the bed material.

Returning to FIG. 1, the gasification gas B discharged from the gasification furnace 13 is sent to the separation device 14. Separation device 1
Reference numeral 4 separates the fine powdery char T mixed into the gasification gas B by a dust collector such as a cyclone (separation step). Then, the char T separated from the gasified gas B
Is transported to the storage tank W via the transport path 15, and is taken out therefrom by a predetermined amount and mixed with coal C, which is the fuel of the thermal power plant X (coal gasification facility 1) (mixing step). However, whether or not the char T is stored in the storage tank W is optional. For example, the char T from the separator 14 can be directly mixed into the coal C. If the char T is already in a fine powder state, it is not necessary to grind the coal T together with the coal C in the mill 2. For example, the char T may be mixed into the coal C on the downstream side of the mill 2. The separation device 14
It is also possible to add a function of separating and removing an oil component from the gasified gas B. The separated oil component is used as various fuels such as burners.

The char T mixed with the coal C via the transport path 15 is burned together with the coal C in the gasifier of the coal gasification facility 1 of the thermal power plant X. However, as described above, since most of the inorganic chlorine remains in the char T, it cannot be mixed with the coal C in a large amount. However, as will be described later, since the gasified gas B is combusted in the exhaust heat recovery boiler 8 after the chlorine content is removed, the amount of chlorine that can be supplied to the coal gasification facility 1 and the exhaust heat recovery boiler 8 is determined. Gasification gas B containing about 90% of organic chlorine
As much as about twice as much char T can be mixed into the coal C as the amount of chlorine removed from the coal, and as a result, the throughput of the waste H per unit time is approximately doubled.

The char T separated from the gasified gas B by the separation device 6 is sent to a storage tank W, and is taken out of the storage tank W by a predetermined amount and converted into coal C which is the fuel of the thermal power generation device X (business boiler 1). By being mixed, it is burned in the commercial boiler 1 together with the coal C. However, whether or not the char T is stored in the storage tank W is optional.
Can be directly mixed into coal C. When the commercial boiler 1 is a pulverized coal-fired boiler, if the char T is already pulverized, it is not necessary to grind the coal T with the coal C in the mill 2. For example, the char T is mixed into the coal C on the downstream side of the mill 2. You may make it do.

Further, not only the coal gasification equipment 1 but also the gas purification equipment 3 and the gas turbine 4 are affected by corrosion and the like by chlorine.
Since most of the organic chlorine is removed when coal is mixed with coal C, adverse effects such as corrosion due to chlorine content on these are not increased. Furthermore, the exhaust gas treatment device 1
Regarding the dust taken out from No. 1, since the chlorine in the whole is very small, it hardly affects the subsequent processing. Therefore, the existing dust processing facility can be used as it is, and the cost can be reduced, as compared with the case where the cost of treating the ash generated when the waste is incinerated in the incinerator is high.

Subsequently, the gasified gas B passing through the separation device 14
Is sent to the chlorine removing device 16. Chlorine remover 16
Is for generating a dechlorinated gasified gas E by removing organic chlorine contained in the gasified gas B (chlorine removal step). Specifically, the slaked lime charging device 17 and
Dust collector 18 such as cyclone, gas cooling tower (not shown)
By adding slaked lime to the gasification gas B with the slaked lime charging device 17, the chlorine content is converted into calcium chloride, and this is collected by a dust collector 18 downstream to remove the chlorine content from the gasification gas B. A dechlorinated gasified gas E is generated. However, the chlorine removing device 16 is not limited to this, and various devices capable of removing chlorine from the gasification gas B are applied.

The dechlorinated gasified gas E generated by the chlorine removing device 16 is sent to a heat source device 19 where it is burned and used as a heat source of the exhaust heat recovery boiler 8 (combustion process). The heat source device 19 is a burner or the like provided in the exhaust heat recovery boiler 8, and burns the dechlorinated gasified gas E with the burner or the like to be a part of the heat source of the exhaust heat recovery boiler 8. Although the waste heat recovery boiler 8 originally uses the combustible gas F as a heat source, since the heat source device 19 bears a part of the amount of heat, the supply amount of the combustible gas F may be reduced accordingly. As a result, the energy use efficiency of the garbage can be improved.

Since the organic chlorine is removed from the dechlorinated gasified gas E, the chlorine is supplied to the exhaust heat recovery boiler 8 by burning it and increasing the chlorine content as a heat source of the exhaust heat recovery boiler 8. No effect of boiler tube corrosion. Further, the increase in chlorine content of the exhaust gas discharged from the exhaust heat recovery boiler 8 is also small, and this exhaust gas can be directly processed by the existing exhaust gas processing device 11.

Further, a part of the dechlorinated gasified gas E is burned by a combustion device or the like, and the combustion gas (hot air) is used as a heat source for the dryer or other auxiliary devices, for example. Is also possible. This eliminates the need for a heat source for a device such as a dryer, and can reduce the cost of the system. In addition,
Since the chlorine content of this combustion gas has already been removed by the chlorine removal device 16, the exhaust gas treatment device 1 of the thermal power generation device X
1 and then released to the atmosphere.
Further, the gasification furnace 13 does not require a heat source. However, the combustion gas may be supplied to the gasification furnace 13 and used as a heat source for heating the fluidized bed 137.

It should be noted that the shapes, combinations, and the like of the constituent members shown in the above-described embodiment are merely examples, and various changes can be made based on design requirements without departing from the spirit of the present invention.

[0037]

As described above, in the waste treatment method according to the first aspect, the waste is converted into carbide and gasified gas by the gasification furnace, the carbide is burned in the coal gasification facility, and the gasified gas is discharged. And removes chlorine from the waste gas and uses it as a heat source by burning it in a waste heat recovery boiler, so that organic chlorine contained in the gasified gas is not injected into coal gasification equipment or waste heat recovery boilers, and only that much Many carbides can be burned in the coal gasification facility, thereby increasing the amount of waste processed per unit time and improving the energy use efficiency of garbage. In addition, since the gaseous gas is burned after separating the finely powdered carbide mixed in the gasified gas, it is possible to avoid the influence of the carbide during the combustion of the gasified gas and to carry out stable combustion. Thus, adverse effects on the combustion burner can be reduced. Furthermore, since the chlorine content in the gasified gas is removed in the chlorine removal step, at least a part of the chlorine content contained in the waste is efficiently removed. Further, since the gasified gas is burned and used as a heat source of the exhaust heat recovery boiler, the cost for heating the exhaust heat recovery boiler can be reduced, and the waste can be processed at lower cost. Furthermore, since the chlorine content in the gasified gas is removed in the chlorine removal step, at least a part of the chlorine content contained in the waste is efficiently removed.

According to a second aspect of the present invention, there is provided a waste treatment method, wherein slaked lime is added to a gasified gas to react organic chlorine (hydrogen chloride) and slaked lime (calcium hydroxide) in the gasified gas. By removing the matter, chlorine can be efficiently removed from the gasified gas.

According to a third aspect of the present invention, in the waste treatment system, the waste is converted into a carbide and a gasified gas by a gasifier, the carbide is burned in a coal gasification facility, and chlorine is removed from the gasified gas. Is burned in the waste heat recovery boiler of the thermal power plant to generate heat, so the organic chlorine contained in the gasified gas is not injected into the coal gasification equipment or the waste heat recovery boiler, and a corresponding amount of carbide is removed. Combustion can be performed in a coal gasification facility, whereby the amount of waste processed per unit time can be increased, and the energy use efficiency of garbage can be improved. In addition, since the fine powdery carbides mixed in the gasified gas are removed by the separation device, it is possible to avoid the influence of the carbides during the combustion of the gasified gas, to carry out stable combustion, and to use a combustion burner or the like. Adverse effects can be reduced. Further, since the chlorine content in the gasified gas is removed by the chlorine removal device, at least a part of the chlorine content contained in the waste is efficiently removed. Further, since the gasified gas is burned and used as a heat source of the exhaust heat recovery boiler, the cost for heating the exhaust heat recovery boiler can be reduced, and the waste can be processed at lower cost.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of a waste treatment system according to the present invention.

FIG. 2 is a perspective view showing an example of a gasification furnace.

[Explanation of symbols]

 B Gasified gas C Coal E Dechlorinated gasified gas F Combustible gas H Waste T Char (carbide) X Thermal power plant 1 Coal gasification facility 4 Gas turbine 8 Waste heat recovery boiler 9 Steam turbine 11 Exhaust gas treatment device 13 Pyrolysis furnace 14 Separation device 15 Transport route 16 Chlorine removal device 19 Heat source device

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F23G 5/16 ZAB F23G 5/46 ZABZ 5/46 ZAB B09B 3/00 302E (72) Inventor Junya Nishino Ishikawashima Harima Heavy Industries, Ltd.Technical Research Institute, Ishikawashima Harima Heavy Industries Co., Ltd. (72) Inventor Tomoo Ayabe 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima-Harima Heavy Industries, Ltd.Technical Research Laboratory F-term (reference) 3G081 BA02 BA13 BB00 BC05 BD00 DA12 DA14 3K061 AA11 AB02 AC13 AC17 AC19 BA05 BA10 FA10 FA21 FA26 3K065 AA11 AB02 AC13 AC17 AC19 BA05 BA10 CA02 JA05 JA13 JA18 JA19 3K078 AA05 BA03 BA22 BA26 CA02 CA21 4D004 AA07 AA12 AA46 BA03 CA04 CA24 CA26 CA27 CB13 CB50 CC11 CC15

Claims (3)

[Claims] 1. A method for treating waste by carbonizing waste, mixing the carbide with coal, and burning the mixture with a thermal power generator, wherein the thermal power generator is a gas turbine for power generation. Equipped with a coal gasification facility for generating a combustible gas for driving a steam turbine, and an exhaust heat recovery boiler for generating steam for driving a steam turbine for power generation using the combustible gas from the gas turbine A gasification step of producing a gasified gas containing chlorine and a carbide by partially burning the waste in a gasification furnace, and separating a fine powdery carbide mixed in the gasified gas. A separating / mixing step of mixing the carbide with the coal by using a coal gas; a chlorine removing step of removing at least chlorine from the gasified gas after the separating step to generate a dechlorinated gasified gas; Burning gas Waste treatment method characterized in that it comprises a combustion step of a heat source of the exhaust heat recovery boiler with. 2. The waste treatment method according to claim 1, wherein in the chlorine removing step, slaked lime is added to the gasified gas to remove chlorine. 3. A system for treating waste by carbonizing waste, mixing the carbide with coal, and burning the mixture with a thermal power generator, wherein the thermal power generator is a gas turbine for power generation. A coal gasification facility that generates a flammable gas for driving, and an exhaust heat recovery boiler that generates steam for driving a steam turbine for power generation using the flammable gas from the gas turbine, A gasification furnace for producing gaseous gas containing chlorine and carbide by partially burning the waste, a separation device for separating fine powdery carbide mixed in the gasification gas, and the separation device A transport path for mixing the carbide separated in the above with coal to the coal gasification facility, and chlorine removal for removing at least chlorine from the gasification gas passing through the separation device to generate a dechlorinated gasification gas. Waste treatment system comprising: the apparatus, and a heat source apparatus for a heat source of the exhaust heat recovery boiler by burning the dehydration chlorinated gasification gas.