JPH109553A - Combustion melting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system capable of highly efficient combustion melting, which system enables ash to be melted effectively and discharged in a reduced state in volume and produces pyrolytic gases almost free of chlorine components. SOLUTION: In a drying furnace 101 heated air from an air heater 109 heats fuel to remove moisture. After egress from the drying furnace 101, the fuel, caused by a circulating flow of pyrolytic gases and a flow of heated air, undergoes partial combustion in a thermal decomposition furnace 102 to produce pyrolytic gases. The pyrolytic gases produced in the thermal decomposition furnace 102 are demineralized by a demineralizer 103. The pyrolytic gases discharged from the demineralizer 103 and the char and ash produced in the thermal decomposition furnace are fed to a combustion melting furnace 106 and turn to melted ash. Combustion gas discharged from the combustion melting furnace 106 is deodorized by the use of a combustion deodorization furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion and melting system suitable for treating waste such as municipal waste.

[0002]

2. Description of the Related Art An example of a conventional combustion melting system is shown in FIG. In FIG. 2, moisture in wastes is removed in a pyrolysis furnace 201 by exhaust gas from a boiler 204, and plastic is pyrolyzed and gasified. And
The mixed gas generated in the pyrolysis furnace 201 is burned by the burner 205, and the combustion gas is supplied to the center of the boiler 204.

[0003] The solid matter that is not gasified in the pyrolysis furnace 201 is burned in a combustion furnace 202 with air separately supplied. Combustion furnace 2
The unburned portion and the fluid medium (silica sand, etc.) discharged from the fuel gas 02 and the combustion gas are guided to a separator 203 and separated into a combustion gas and a solid component. 201.

[0004] The combustion gas generates steam in the boiler 204, lowers its temperature, and is discharged after removing chlorine and the like in an exhaust gas treatment facility 206. At a point A in the figure, the boiler exhaust gas is branched into a portion that is recycled to the above-described pyrolysis furnace 201 and a portion that is sent to the exhaust gas treatment facility 206.

[0005]

In the conventional combustion melting system shown in FIG. 2, since the generated pyrolysis gas contains a large amount of water, its calorie is low and the combustion gas temperature is low. Therefore, it is difficult to melt the ash by the pyrolysis gas and the heat of combustion of the solid, and the ash is discharged in a solid form and has a large volume.

Further, the pyrolysis gas obtained by the conventional combustion melting system contains chlorine, and a boiler that burns the pyrolysis gas cannot supply the combustion gas to the high temperature portion of the boiler because the heat transfer tube is corroded. Exhaust gas treatment equipment for removing the components becomes large.

The present invention provides a system capable of effectively melting ash and discharging in a reduced volume state, and generating a pyrolysis gas containing almost no chlorine component to perform combustion melting with high combustion efficiency. That is the task.

[0008]

According to the present invention, there is provided a combustion / melting system having the following configuration to solve the above-mentioned problems. That is, the system according to the present invention comprises a drying furnace for heating fuel with heated air to remove moisture, and a pyrolysis for partially burning fuel exiting the drying furnace with pyrolysis gas and heated air to generate pyrolysis gas. Furnace is provided.

The system according to the present invention further comprises a desalination apparatus for desalinating the pyrolysis gas generated in the pyrolysis furnace, the pyrolysis gas exiting the desalination apparatus, the char generated in the pyrolysis furnace, and It has a combustion and melting furnace that supplies ash to obtain molten ash, and a combustion and deodorization furnace that combusts and deodorizes combustion gas emitted from the combustion and melting furnace.

[0010] According to the combustion and melting system of the present invention having the above-described configuration, the fuel, for example, the water in the waste is separated in the drying furnace, and the pyrolysis is performed on the dried waste, so that the high calorie heat is obtained. Obtain cracked gas. Then, desalting treatment is performed by adding nitrite lime or the like to the obtained pyrolysis gas by a desalting apparatus.

In the combustion melting furnace, the pyrolysis gas and the char generated in the pyrolysis furnace are burned with heated air to generate a high-temperature gas, and the high-temperature gas melts and reduces the ash content. Air containing moisture and odor components from the combustion melting furnace is mixed and reacted with high-temperature gas in a combustion deodorizing furnace to deodorize.

The fuel in the drying furnace, such as high-temperature air for removing moisture from waste and burning, can be obtained by heat exchange with high-temperature combustion gas or high-temperature pyrolysis gas.

As described above, according to the combustion and melting system of the present invention, a high-calorie pyrolysis gas and a char
By burning with heated air at about 0 to 500 ° C, 1
A high-temperature gas of 300 ° C. or more can be obtained, whereby the ash can be melted and reduced in volume.

Further, hydrochloric acid is generated in the pyrolysis gas by the thermal decomposition of vinyl chloride or the like. In the combustion melting system of the present invention, nitrate lime or the like is added to the pyrolysis gas in the desalination apparatus and reacted. Chlorine can be removed from the pyrolysis gas, so that equipment subsequent to the desalination unit does not corrode with hydrochloric acid.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a combustion melting system according to the present invention will be specifically described based on one embodiment shown in FIG. In FIG. 1, reference numeral 101 denotes a drying furnace for removing moisture in waste as fuel, 102 a pyrolysis furnace for thermally decomposing waste from which moisture has been removed, 103 a desalination apparatus,
4 is a dust remover, 105 is an air heater.

Reference numeral 106 denotes a combustion melting furnace for burning char and ash from the pyrolysis furnace 102, and 107 denotes a combustion deodorization furnace. 108 is a steam heater, 109 is an air heater,
Reference numeral 110 denotes an evaporator, and 111 denotes an exhaust gas treatment device.

In the combustion and melting system of FIG. 1 constituted by the above-described equipment, air heated to about 250 ° C. by the air heater 109 is supplied to the drying furnace 101 to remove moisture in the waste. Then, the water-containing air flowing out of the drying furnace 101 is guided to the air heater 109 and heated again to about 400 ° C., and then used as combustion air in the combustion melting furnace 106 and the combustion deodorizing furnace 107.

The waste dried in the drying furnace 101 is supplied to a pyrolysis furnace 102, where it is desalinated 103 and a dust remover 1
04. The pyrolysis gas circulating through the air heater 105 and the air heated to about 400 ° C. by the air heater 105 are mixed and partially burned to generate a pyrolysis gas at about 650 ° C.

The pyrolysis gas obtained in the pyrolysis furnace 102 reacts with the nitrite lime in the desalination unit 103, and the chlorine content becomes calcium chloride. This calcium chloride is separated by the dust remover 104, and a clean pyrolysis gas is generated. Part of the pyrolysis gas is circulated to the pyrolysis furnace 102 via the air heater 105, and the remainder is supplied to the combustion melting furnace 106,
2 together with the char and ash extracted from the bottom part and combust with the heated air heated by the air heater 105.

The molten ash is discharged from the bottom of the combustion and melting furnace 106 as slag, and the high-temperature combustion gas discharged from the top is supplied to the combustion and deodorization furnace 107. In the combustion deodorization furnace 107, air containing water and other volatile components reacts with the high-temperature combustion gas to eliminate odor components.
The high-temperature combustion gas discharged from the combustion deodorization furnace 107 is supplied to the steam heater 1
08, heat exchange with the air heater 109 and the evaporator 110, and then the exhaust gas is discharged through the exhaust gas treatment device 111.

As described above, according to the combustion melting system shown in FIG. 1, the ash can be effectively melted and discharged in a reduced volume state, and a pyrolysis gas containing almost no chlorine component can be generated.

[0022]

As described above, the present invention comprises a drying furnace, a pyrolysis furnace for fuel dried in the drying furnace, a desalination device for pyrolysis gas, a combustion melting furnace, and a combustion deodorization furnace. The present invention provides a combustion melting system, which can provide the following effects.

(1) A high-calorie pyrolysis gas and char obtained in a pyrolysis furnace are burned with high-temperature air in a combustion melting furnace to obtain a high-temperature gas of 1300 ° C. or more, and ash content is obtained without additional fuel and oxygen enrichment. Can be melted and discharged in a reduced volume state.

(2) Since a high-temperature and small amount of pyrolysis gas is subjected to a desalination treatment by a desalination device, the desalination efficiency is high and the desalination device is compact.

(3) Since the pyrolysis gas after desalination is burned in the combustion melting furnace, there is no need to worry about corrosion even if the combustion gas is used as a heat source for heat exchange or a high-temperature heat transfer tube. Almost no hydrochloric acid content in exhaust gas. From this, 5
It is possible to generate high-temperature steam of 00 ° C. or more, and the thermal efficiency of the plant is increased to 30% or more.

[Brief description of the drawings]

FIG. 1 is a system diagram of a combustion melting system according to an embodiment of the present invention.

FIG. 2 is a system diagram of a conventional combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Drying furnace 102 Thermal decomposition furnace 103 Desalination apparatus 104 Dust remover 105 Air heater 106 Combustion melting furnace 107 Combustion deodorization furnace 108 Steam heater 109 Air heater 110 Evaporator 111 Exhaust gas treatment device

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuyuki Amitani 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Kobe Shipyard

Claims (1)

[Claims] 1. A drying furnace for heating a fuel with heated air to remove moisture, a pyrolysis furnace for partially burning the fuel exiting the drying furnace with a pyrolysis gas and heated air to generate a pyrolysis gas,
A desalination device for desalinating the pyrolysis gas generated in the pyrolysis furnace, a combustion process for supplying the pyrolysis gas exiting the desalination device, and the char and ash generated in the pyrolysis furnace to obtain molten ash A combustion melting system comprising a melting furnace and a combustion deodorizing furnace for burning and deodorizing combustion gas emitted from the combustion melting furnace.