JPH08170817A - Equipment for melting treatment of waste - Google Patents

Abstract

PURPOSE: To prevent sticking of tar inside a gas duct without causing an increase in the cost of installation or maintenance and thereby to make facilities operate efficiently. CONSTITUTION: An evolved gas produced in a waste melting furnace 1 constructed by arranging vertically a thermal decomposition zone 1b decomposing thermally waste charged in and a burning melting zone 1c burning and melting the waste decomposed thermally in the thermal decomposition zone 1b is supplied to a gas fired boiler 3 through a gas duct 2 and combusted in this boiler 3 so as to generate steam and electric power is generated by the steam by a power generating device 5. In this construction, the gas duct 2 is provided with a supply port 2a of oxygen or an oxygen-containing gas for combustion which makes the evolved gas be combusted partially in the gas duct 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste melting treatment apparatus.

[0002]

2. Description of the Related Art In recent years, a waste melting furnace has been proposed for collectively processing miscellaneous wastes including municipal waste. The waste melting furnace is a drying zone, a pyrolysis zone, and
It is configured by arranging three treatment zones called combustion and melting zones, and the waste that is injected with coke and lime from above the furnace is dried in the residual heat drying zone where the temperature is maintained at about 400 to 500 ° C. The organic matter contained in the waste in the thermal decomposition zone, which is maintained at about 500 to 800 ℃, is methane, hydrogen,
Thermal decomposition to combustible gas such as carbon monoxide, 1500 ℃
It is melted in the combustion melting zone maintained at.
In the combustion melting zone, the coke charged from above the furnace rapidly undergoes a high temperature and high heat due to a rapid combustion reaction due to the air and oxygen-enriched gas supplied from the tuyere, and the ash and inorganic substances are melted by this heat, At the same time, the heat is used for pyrolysis in the pyrolysis zone and for drying in the drying zone. The generated gas generated in the waste melting furnace is supplied as a fuel gas to the gas combustion boiler via the flue,
A waste melting treatment apparatus has been proposed in which steam generated in the gas combustion boiler is used in a facility such as a steam power generator.

[0003]

However, in the above-mentioned waste melting treatment apparatus, while the high-temperature generated gas generated in the waste melting furnace passes through the flue and reaches the gas combustion boiler. As a result of being cooled, the vaporized tar existing in the generated gas is condensed and adheres and grows on the inner wall of the flue, and finally the flue is blocked. In such a case, it is necessary to once stop the operation of the facility and perform maintenance processing such as cleaning of the flue, which has a drawback that the operating efficiency of the facility is reduced. Therefore, it is conceivable that the flue is provided with a heating mechanism or a heat retaining mechanism for preventing the temperature of the generated gas from decreasing, and the adhesion of tar is prevented, but the addition of the heating device causes an increase in equipment cost, and There is a problem in that energy is required for that purpose, resulting in an increase in maintenance costs, and there is room for further improvement from the viewpoint of efficient operation of equipment.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, prevent tar from adhering to the inside of the flue, and increase the efficiency of the facility without increasing equipment costs and maintenance costs. The point is to provide a waste melting treatment apparatus that can be operated.

[0005]

[Means for Solving the Problems] A characteristic constitution of a waste melting treatment apparatus according to the present invention for achieving the above object is to provide a flue gas duct for supplying the gas generated in the waste melting furnace to the gas combustion boiler. The point is that an oxygen or oxygen-containing gas supply port for combustion is provided which partially burns the generated gas in the flue.

[0006]

When, for example, air is supplied from the oxygen or oxygen-containing gas supply port provided in the flue that supplies the gas combustion boiler with the gas generated from the waste melting furnace, the generated air passes through the flue. A part of the gas burns, and the combustion heat generated at that time prevents the temperature of the generated gas from lowering, and vaporized tar is prevented from condensing in the flue and adhering to the inner wall.

[0007]

Therefore, according to the present invention, it is possible to prevent tar from adhering to the inside of the flue and to efficiently operate the facility without increasing facility costs and maintenance costs. A melt processing apparatus can be provided.

[0008]

EXAMPLES Examples will be described below. As shown in FIG. 1, the waste melting treatment apparatus includes a waste melting furnace 1, a gas combustion boiler 3 that combusts a gas generated in the waste melting furnace 1 to generate steam, and the gas combustion boiler 3. A power generation device 5 and the like for generating power by the generated steam is provided and configured.

The municipal solid waste generated in each household is collected in a solid waste pit 20 by a solid waste collection vehicle, and a crane mechanism 21 is used.
Is put into the hopper 22 provided above the waste melting furnace 1 and is pushed into the waste melting furnace 1 by a hydraulic drive type pushing mechanism 22a provided in the lower part of the hopper 22. The waste melting furnace 1 is a vertical furnace, and is constituted by arranging three processing zones, a drying zone 1a, a thermal decomposition zone 1b, and a combustion melting zone 1c, from the upper side to the lower side. The waste that is put in from about 400 ℃ to 500 ℃
It is dried in the drying zone 1a maintained at about 500 ° C to 8 ° C.
In the pyrolysis zone 1b maintained at 00 ° C, the organic matter contained in the waste is pyrolyzed into combustible gases such as methane, hydrogen, carbon monoxide and carbon dioxide, and in the combustion melting zone 1c maintained at about 1500 ° C. The residue is melt processed. Corrosive gases such as hydrogen chloride generated in the process of decomposing the vinyl chloride contained in the waste in the thermal decomposition zone 1b pass through the gas combustion boiler 8 and are then stored in the reaction chamber that also serves as the flue. After being neutralized with the supplied alkaline agent such as lime powder and fixed as salts such as calcium chloride, it is captured and removed by a bag filter following the reaction chamber. In the combustion-melting zone 1c, the waste material charged from above the furnace 1 is dried and pyrolyzed, and then a part of the carbon content and the inorganic content are present in the waste material. The air and oxygen gas supplied from the tuyere 1d formed on the side wall of the combustion melting zone 1c causes a combustion reaction to generate high temperature and high heat, and this heat melts ash and inorganic substances, and at the same time heat generated at that time. Is subjected to a thermal decomposition treatment in the thermal decomposition zone 1b and a drying treatment in the drying zone 1a.

The gas-fired boiler 3 is constructed by arranging a water pipe 3c in a combustion chamber 3b provided with a combustion device 3a, and about 400 ° C. to 500 ° C. generated in the waste melting furnace 1.
A combustible gas at 0 ° C. was supplied through a flue 2 formed between the waste melting furnace 1 and the combustion device 3a, and the high temperature combustion gas generated in the combustion device 3a was heat-exchanged. Later attracted by the attracting blower 25, the economizer 3d
2 through the exhaust gas treatment device such as a bag filter 23
Exhausted from 4. At the upstream side of the flue 2, the inflowing air flows to the downstream side of the flue 2 through a controllable oxygen or oxygen-containing gas supply port 2a for combustion that partially combusts the generated gas inside the flue 2. As described above, a tubular guide member having an angle is provided, and when, for example, air is supplied from the supply port 2a, the air causes the flue 2 to flow.
A part of the generated gas passing through the chamber is burned, and the temperature of the generated gas is prevented from lowering due to the combustion heat generated at that time, so that the vaporized tar is condensed in the flue 2 and adheres to the inner wall. Prevent. The steam generated in the gas combustion boiler 3 is stably supplied to the power generator 5 including the steam turbine 5a that drives the power generator 5b, and the power generated by the power generator 5 is supplied to the waste melting treatment device. It is used as power for operation and surplus power is supplied to the outside.

Another embodiment will be described below. In the previous embodiment, the oxygen or oxygen-containing gas supply port 2a is connected to the flue 2
At the upstream side position, a cylindrical guide member having an angle so that the inflowing air flows to the downstream side of the flue 2 is provided, and the outside air naturally flows in by the induction fan 25. However, the mounting position and the configuration of the supply port 2a are not limited to this, and may be arbitrary. For example, the blower fan may be configured to forcibly supply the outside air. In order to supply only the amount of air necessary for partially burning the generated gas in the flue 2, a flow rate limiting mechanism such as a valve, a damper, or a blower fan is provided at the supply port 2a, and the combustion inside the flue 2 is performed. A temperature sensor is provided in a region (downstream of the air supply port 2a), and the temperature detected by the temperature sensor is a temperature at which vaporized tar is prevented from aggregating, for example, 600 ° C or higher, preferably 800 ° C.
Control means may be provided to control the flow rate limiting mechanism so as to maintain the above. Further, instead of the temperature sensor, an oxygen gas concentration sensor may be provided, and a control means for controlling the flow rate limiting mechanism so that the oxygen gas concentration maintains a predetermined value may be provided. Although the example of supplying the combustion air from the air supply port 2a has been described, an oxygen-containing gas such as combustion oxygen may be supplied instead of the combustion air.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a waste melting treatment device.

[Explanation of symbols]

 1 Waste Melting Furnace 1b Pyrolysis Zone 1c Combustion Melting Zone 2 Flue 2a Air Supply Port 3 Gas Combustion Boiler

Claims (1)

[Claims] 1. A thermal decomposition zone (1b) for thermally decomposing the input waste and a combustion melting zone (1c) for combusting and melting the waste thermally decomposed in the thermal decomposition zone (1b) are arranged vertically. A waste melting treatment apparatus comprising a waste melting furnace (1) and a gas combustion boiler (3) that burns the gas generated in the waste melting furnace (1) to generate steam. , Oxygen for combustion that partially burns the generated gas in the flue (2) to a flue (2) that supplies the generated gas in the waste melting furnace (1) to the gas combustion boiler (3) A waste melting treatment device provided with a containing gas supply port (2a).