JPH1073233A - Molten slug water-cooling device for combustion melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and easily treat molten slug to produce solid slug being even in a gain and having a desired grain size. SOLUTION: A molten slug water-cooling device 2 is arranged at the molten slug discharge port of a combustion melting furnace to burn a combustible substance at temperature, at which an ash content is molten, to produce molten slug (f), and the molten slug (f) is water-cooled to produce solid slug. In this case, a water temperature control means 5 is provided to control the temperature of water (h) used for water-cooling to a value at which the grain size of the solid slug generated through water-cooling is adjusted to a desired size. Further, the water temperature control means 5 comprises a cooling tower 6 to cool the water (h) used for water-cooling; a circulation pump 7 to circulate the water (h) in a water tank 3 through the cooling tower and return the water to the water tank; and a temperature controller 11 to detect the temperature of the water (h) in the water tank 3 and transmit drive and stop signals to the circulation pump 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ash produced by burning combustibles, especially waste (general waste such as municipal waste from homes and offices, waste plastic, car shredder dust, waste office equipment). , Electronic equipment, industrial wastes such as chemical products, etc., including combustibles) by pyrolysis of the pyrolysis gas and the combustible components obtained by pyrolysis together with combustion air into molten slag, Further, the present invention relates to a molten slag water cooling device of a combustion melting furnace which is cooled by water to form a solid slag, and a waste treatment device provided with the device.

[0002]

2. Description of the Related Art Conventionally, molten slag water cooling in a combustion melting furnace is performed in which ash produced by burning combustibles containing fine incombustibles such as ash is melted to form molten slag, and further cooled with water to form solid slag. As an apparatus, for example, an apparatus described in Japanese Patent Publication No. 6-56253 is known. First, waste containing general waste such as municipal solid waste and combustibles such as waste plastics is put into a pyrolysis reactor and pyrolyzed in a low oxygen atmosphere. Form and separate from decomposition residues. Furthermore, the pyrolysis residue is separated into a combustible component and a non-combustible component by a separator, and the combustible component generated at this time and the pyrolysis gas are burned by a combustion melting furnace, and the generated ash is melted. Then, the molten slag which falls from the discharge port of the combustion melting furnace is guided to a water tank and rapidly cooled with water. And
Since the generated solid slag is considered to be reused for road pavement and aggregates of buildings, solid slag having a uniform particle size as much as possible is desired.

[0003]

However, the above-mentioned conventional molten slag water cooling system for a combustion melting furnace has a temperature of about 1300 ° C.
Since the high-temperature molten slag is rapidly cooled by suddenly putting it into the water of the water tank, the slag mass undergoes thermal shrinkage, and is finely cracked, resulting in the generation of particles having an irregular particle size.

[0004] In addition, the original waste of molten slag is a variety of things, such as combustibles such as garbage, paper, waste plastic, car shredder dust, etc., from households and offices, waste office equipment, and the like. There are incombustible substances such as metals, pottery, gravel and concrete chips from electronic devices and construction materials.The quality and quantity of pyrolysis gas and combustible components generated by pyrolyzing these fluctuate. The amount of molten slag discharged from the melting furnace also varies. Accordingly, the amount of the hot molten slag that falls from the outlet of the combustion melting furnace also fluctuates, and accordingly, the temperature of the water in the water tank also fluctuates. Further, since the water temperature varies depending on the season, it is difficult to always obtain a solid slag having a desired particle size stably.

An object of the present invention is to stabilize molten slag when burning combustibles containing fine incombustibles such as ash, discharging the generated ash as molten slag, and cooling it with water to form solid slag. It is an object of the present invention to provide a molten slag water cooling device of a combustion melting furnace and a waste treatment device provided with the same, which can easily produce solid slag having a desired particle size with uniform grains.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is provided at the molten slag discharge port of a combustion and melting furnace for discharging molten slag generated by burning combustibles at a temperature at which ash is melted. Further, in the molten slag water cooling apparatus for cooling the molten slag into water by solid cooling, a water temperature control means for controlling a temperature of water used for water cooling is provided.
By providing the water temperature control means for controlling the temperature of the water used for water cooling, the molten slag is cooled with the water having the set constant water temperature, so that the particle size of the solid slag generated is uniform.

Further, in the molten slag water cooling device of the combustion melting furnace, the water temperature control means controls the temperature of the water used for the water cooling so that the particle size of the solid slag generated by the water cooling becomes a desired size. Things. By water temperature control means for controlling the temperature of the water used for water cooling so that the particle size of the solid slag generated by water cooling becomes a desired size,
In addition to the operation of the molten slag water cooling device of the combustion melting furnace, the water temperature is relatively easily controlled to control the particle size of the generated solid slag to a desired size. The diameter can be obtained.

[0008] In any one of the above-mentioned devices for cooling the molten slag of the combustion melting furnace, the water temperature control means is provided in a water tank in which the molten slag falls, and cools water used for the water cooling. And a temperature controller that detects the temperature of the water in the water tank and sends a drive and stop signal to the circulating pump.

The molten slag water cooling device having such a structure has the function of the molten slag water cooling device of any of the above-mentioned combustion melting furnaces, and increases the temperature while cooling the molten slag in which water in the water tank falls. When the temperature reaches a predetermined upper limit temperature, the temperature controller detects the upper limit temperature and sends a drive signal to the circulation pump. Upon receiving this signal, the circulation pump sends the water in the water tank to the cooler. The cooler cools the water sent from the water tank. Further, the cooled water is returned to the water tank by the circulation pump. When the water in the water tank reaches a predetermined lower limit temperature, the temperature controller detects the lower limit temperature and sends a stop signal to the circulation pump, and the circulation pump stops. Thus, the water temperature of the water tank can be reliably controlled by the simple control device.

[0010] Further, a pyrolysis reactor for pyrolyzing the input waste to generate a pyrolysis gas and a pyrolysis residue mainly composed of a non-volatile component, and a pyrolysis reactor generated by the pyrolysis reactor. A discharge device for separating and discharging a gas and a pyrolysis residue, a separation device for separating the pyrolysis residue discharged from the discharge device into a combustible component and a non-combustible component, and the pyrolysis gas And a combustible component, which burns the combustible component together with combustion air to melt the generated ash, and a molten slag water cooling device for water-cooling the molten slag melted in the combustion melting furnace to form a slag. In the apparatus, the molten slag water cooling device includes the molten slag water cooling device of the combustion melting furnace according to any one of the above.

The waste treatment apparatus provided with the molten slag water cooling device for a combustion melting furnace according to any one of the above-described embodiments improves the treatment efficiency.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a molten slag water cooling device for a combustion melting furnace according to the present invention and a waste treatment device provided with the same will be described below with reference to the drawings. In FIGS. 1 and 2 below, the same structures and working parts are denoted by the same reference numerals.

FIG. 2 is a system diagram showing an embodiment of a waste treatment apparatus provided with a molten slag water cooling device according to the present invention. In the waste treatment apparatus 1 of the present embodiment, the waste a such as municipal waste is, for example, a crusher such as a twin-screw type,
It is crushed to 150 mm square or less, and charged into the charging section 14 by a conveyor or the like. The waste a charged into the charging section 14 is supplied to the pyrolysis reactor 16 via the screw feeder 15. Waste a is in the pyrolysis reactor 16 is heated by a heat exchanger (not shown) disposed on the downstream of the combustion melting furnace 24 for melting to burn pyrolysis residue such as via a heated air line L ₁ Is heated to 300 to 600 ° C., usually to about 450 ° C. by the heated air g (heat medium) supplied. The inside of the thermal decomposition reactor 16 is maintained at a pressure lower than the atmospheric pressure and is controlled to a low oxygen atmosphere.

Further, the waste a heated by the heated air g is thermally decomposed into a pyrolysis gas G ₁ and a pyrolysis residue b mainly composed of a non-volatile component. Separated. The pyrolysis gas G ₁ separated by the discharge device 17 is supplied from above the discharge device 17 to the burner 25 of the combustion melting furnace via the pyrolysis gas line L ₂ . The pyrolysis residue b discharged from the lower part of the discharge device 17 is 45
Since the temperature is relatively high at about 0 ° C., it is cooled to about 80 ° C. by the cooling device 19.

Further, the pyrolysis residue b is, for example, a magnetic separation type,
It is supplied to a known single or combined separation device 20, such as an eddy current type, a centrifugal type or a wind separation type, where it is separated into a combustible component c containing fine incombustible components such as ash and a non-combustible component d. Then, the non-combustible component d is collected in the container 21 and reused. Combustible component c containing fine incombustibles such as ash
Is by a pulverizer 22, for example, 1mm milled below, the burner of the combustion melting furnace through a combustible component line L ₃ 2
5 is supplied to, 1,300 ° C. with combustion air e supplied through the combustion air line L ₄ by thermal decomposition gas G ₁ and the forced draft fan 26 which is supplied from the pyrolysis gas line L ₂
The ash generated at this time becomes molten slag f, adheres to the inner wall of the combustion melting furnace 24, further flows down the inner wall, and flows from the bottom discharge port 27 to the discharge passage 2.
The molten slag is dropped into the water tank 3 of the water cooling device 2 through the slag 9 to be cooled and solidified.

High-temperature exhaust gas G generated in the combustion melting furnace 24
₂ is dust in the heat recovered precipitator 33 at the exhaust gas boiler 30 via a flue gas line L ₅ through the hot air heater 28, after the harmful components are removed further in the exhaust gas purifier 34, a low temperature attract blower 3 is a clean exhaust gas G ₃ of
5 through the chimney 36 to the atmosphere. Some of the cold clean gas G ₃ are, is returned to the cooler 19 through the exhaust gas circulation line L _6. The steam generated by the exhaust gas boiler 30 is used for power generation by a generator 31 having a steam turbine.

FIG. 1 is a longitudinal sectional view showing an embodiment of a molten slag water cooling device provided in the waste treatment device 1. The molten slag water cooling device 2 of the present embodiment melts the ash described above and water-cools the molten slag f that falls from the discharge port of the combustion melting furnace through the discharge passage 29 to solid slag. A water tank 3 for holding water h used for
A conveyor 4 for conveying the produced solid slag and a water temperature control means 5 for controlling the temperature of water h used for water cooling are provided.

The conveyor 4 has a horizontal portion 4a for receiving the solid slag and transporting the solid slag in a substantially horizontal direction, and an inclined portion 4b for carrying the solid slag out of the water. The solid slag transported by the inclined portion 4b is indicated by an arrow. It is carried out in the direction of 4c.

The water temperature control means 5 controls the temperature of the water h used for water cooling so that the particle size of the solid slag generated by the water cooling becomes a desired size. A cooling tower for cooling the water itself by spraying water to cool the water itself by latent heat of evaporation, a circulation pump 7 for circulating the water in the water tank 3 through the cooling tower 6, and a water tank 3
The temperature of the water in the circulating pump 7 and the stop signal 1
And a temperature controller 11 for transmitting the second signal. When the cooler is the cooling tower 6, a circulation pump for supply is provided on the inlet side of the cooling tower 6, and a circulation pump for return is provided on the outlet side of the cooling tower 6.

The molten slag water cooling device 2 having the above configuration
Works as follows. That is, the water temperature control means 5 controls the temperature of the water h used for water cooling so that the particle size of the solid slag generated by the water cooling becomes a desired size.
The molten slag f can be cooled with the water h at a set constant water temperature, and the particle size of the generated solid slag becomes uniform.
This is because the particle size of the solid slag depends on the water temperature when the molten slag f is solidified into the solid slag. The molten slag f falls into the water tank 3 at about 1300 ° C. At this time, when the water temperature is high, for example, when cooled at a water temperature close to 100 ° C., the particle diameter tends to be large, for example, a thin string shape. When the water temperature is low, for example, when it is cooled at a water temperature close to 0 ° C., it is easily broken and solidified, and the particle size tends to be reduced.

Further, the molten slag water cooling device 2 is used to cool the molten slag f when the temperature of the water in the water tank rises while cooling the molten slag f and reaches a predetermined upper limit temperature, for example, 62 ° C. Controller 11 detects water temperature and circulates pump 7
Send the drive signal to In response to this signal, the circulation pump 7
Sends the water in the water tank 3 to the cooling tower 6. The cooling tower 6 cools the water sent from the water tank 3. Further, the cooled water is returned to the water tank 3 by the circulation pump 7. When the temperature of the water in the water tank 3 reaches a predetermined lower limit temperature, for example, when the temperature reaches 58 ° C., the temperature controller 11 detects the water temperature and sends a stop signal to the circulation pump 7 to stop the circulation pump 7.
Thus, the temperature of the water in the water tank is reliably controlled by the simple control device. Here, the predetermined upper limit temperature and the predetermined lower limit temperature are determined in advance by a trial run or a preliminary test so as to obtain a desired particle size.

The molten slag water cooling device 2 of the present embodiment
By controlling the water temperature, which is relatively easy to control, the particle size of the produced solid slag can be made a desired size, and a particle size suitable for the intended use of the solid slag can be obtained. In addition, the waste treatment apparatus 1 provided with the molten slag water cooling device 2 of the combustion melting furnace,
Processing efficiency is improved.

[0023]

According to the molten slag water cooling system for a combustion and melting furnace of the present invention, the molten slag can be easily and stably converted into solid slag having a desired particle size with uniform grains.

Further, according to the waste treatment apparatus of the present invention, the treatment efficiency is improved by providing the molten slag water cooling apparatus of the combustion melting furnace.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a molten slag water cooling device for a combustion melting furnace according to the present invention.

FIG. 2 is a system diagram showing an embodiment of a waste treatment apparatus provided with a molten slag water cooling device of the combustion melting furnace shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Waste treatment apparatus 2 Molten slag water cooling apparatus 3 Water tank 5 Water temperature control means 6 Cooling tower (cooler) 7 Circulation pump 11 Temperature controller 16 Pyrolysis reactor 17 Discharge apparatus 20 Separation apparatus 24 Combustion melting furnace 27 Discharge port G ₁ heat Cracked gas a Waste b Pyrolysis residue c Flammable component d Non-flammable component e Combustion air f Molten slag h Water used for water cooling

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hidehiro Kiuchi 3-1-1, Tamano, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd.

Claims (4)

[Claims] 1. A molten slag provided at the molten slag discharge port of a combustion melting furnace for discharging a molten slag generated by burning a combustible material at a temperature at which ash is melted, wherein the molten slag is water-cooled to a solid slag. A molten slag water cooling device for a combustion melting furnace, comprising a water temperature control means for controlling a temperature of water used for water cooling in the water cooling device. 2. The method according to claim 1, wherein the water temperature control means controls a temperature of the water used for the water cooling so that a particle size of solid slag generated by the water cooling becomes a desired size. A molten slag water cooling device for a combustion melting furnace. 3. The water temperature control means according to claim 1, wherein the water temperature control means is provided in a water tank in which the molten slag falls, and cools water used for water cooling, and cools the water in the water tank with the cooler. A circulating pump for circulating and returning, and a temperature controller for detecting a temperature of the water in the water tank and transmitting a drive signal to the circulating pump and transmitting a stop signal; . 4. A pyrolysis reactor that pyrolyzes the input waste and generates a pyrolysis gas and a pyrolysis residue mainly composed of nonvolatile components, and a pyrolysis reactor generated by the pyrolysis reactor. A discharge device for separating and discharging a gas and a pyrolysis residue, a separation device for separating the pyrolysis residue discharged from the discharge device into a combustible component and a non-combustible component, and the pyrolysis gas And a combustible component, which burns the combustible component together with combustion air to melt the generated ash, and a molten slag water cooling device for water-cooling the molten slag melted in the combustion melting furnace to form a slag. In the apparatus, the molten slag water cooling device is provided with the molten slag water cooling device of the combustion melting furnace according to any one of claims 1 to 3.