JPH05288320A - Method for loading waste material into melting furnace - Google Patents

Abstract

PURPOSE:To increase an amount of combustion gas passing within a waste material charging region by a method wherein block-like carbonic combustibles and waste materials are distributed alternatively in a layer form within a loading cylinder and a column-like region of the block-like carbonic combustibles is formed at a cental part of the cylinder. CONSTITUTION:Within a melting furnace 10, some block-like cokes B with a diameter of about 45 to 75mm are loaded from a waste material loading cylinder 4 and then a column-like layer is formed as a cokes single layer 7. Powder-like municipal incinerated ashes A1 and the mixed materials of lime stones C as well as the block-like cokes B are loaded in a layer form. With such an arrangement, the charging region 8 having the column-like cokes single layer within the waste material loading cylinder 4 and the ignited ashes having their layer regions around them is formed below the waste material loading cylinder 4. In this way, the layered region of the block-like cokes formed within the charging region having as its major part the combustion ashes with poor aeration characteristics forms a passing passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to municipal solid waste, various industrial wastes, or intermediate products obtained by drying, incineration, crushing, etc., using a lumpy carbonaceous combustible substance such as coke as a heat source. The present invention relates to a charging method for a charge in a waste melting furnace, which is heated and melted and recovered as a civil engineering material, a concrete fine aggregate, and a slag material for a surface makeup aggregate.

[0002]

2. Description of the Related Art The applicant of the present application discloses, in Japanese Patent Laid-Open No. 3-5611, a tuyere at the bottom of a hollow cone-shaped furnace body whose upper part is enlarged and whose inner surface is formed at an angle not less than the repose angle of a massive carbonaceous combustible material. Is provided, and a tap hole is provided at a position lower than the same
A waste charging cylinder is inserted from the center of the upper surface of the furnace body so that the tip is located above the tuyere, and a plurality of massive carbonaceous combustible material charging inlets are provided at the periphery of the upper surface of the furnace body, and exhaust is provided above the furnace body. In a waste melting furnace equipped with a gas outlet, a bulk carbon-based combustible substance is charged together with the waste from the waste charging cylinder in the center, and a filling area mainly composed of waste is formed under the charging cylinder. And, the filling area of the lumpy carbonaceous combustible material charged from the charging inlet of the lumpy carbonaceous combustible material surrounds the periphery of the filling area mainly composed of the waste, and a space area above it. The operating method which does not have was disclosed.

This operation method using a melting furnace is capable of reliably supplying a massive carbonaceous combustible substance as a heat source to the high temperature hearth below the waste packed bed, and at the same time, a high temperature combustion gas mainly generated from the high temperature hearth. The dust scattering from the waste can be minimized by passing through the lumpy carbon-based combustible substance-filled layer around the waste-filled layer with good air permeability, and the dust once scattered also passes through the lumpy carbon-based combustible substance-filled layer. There is an advantage that dust accompanying the exhaust gas that is captured in the process and finally discharged from the furnace can be suppressed.

In this operating method, above the high temperature hearth,
A melting surface is formed on the lower outer surface of the charging material filling area mainly composed of waste material formed below the charging cylinder, and the melting capacity in such a melting furnace is proportional to this melting area. In order to increase the melting area, the diameter of the charging cylinder inserted into the center of the furnace body from above may be increased to expand the charging area of the charging material.

However, by expanding the filling area of the charge, the diameter of the high-temperature hearth for producing high-temperature combustion gas is also increased. This expansion of the diameter of the high-temperature hearth exceeds the limit of the reaching distance of the oxygen-containing gas from the tuyere to the core, causing a shortage of combustion air to the high-temperature hearth, and the burning rate of coke in the high-temperature hearth. Causes a difference between the central part of the lower part of the charging cylinder and the inner peripheral part, and it becomes impossible to stably maintain the high temperature hearth, and the melting capacity per unit area of the furnace bottom is lowered.

Therefore, when the charging cylinder diameter and the high-temperature hearth diameter are increased to increase the melting area, the oxygen-containing gas from the tuyere easily reaches the central part of the high-temperature hearth so that the gas in the furnace can be easily reached. It is important to improve the flow.

[0007]

SUMMARY OF THE INVENTION It is an object of the invention to charge this improvement in the gas flow in the furnace with the waste charged from the waste charging cylinder inserted in the central part of the furnace body. This is done by improving the charging method of the massive carbonaceous combustible material.

[0008]

According to the present invention, a tuyere is provided in the lower portion of a hollow cone-shaped furnace body having an enlarged upper portion and an inner surface formed at an angle greater than or equal to the repose angle of massive carbonaceous combustible material. Provide a tap hole at a position lower than the mouth, and insert the waste charging cylinder from the center of the upper surface of the furnace body so that the tip is located above the tuyere,
In a waste melting furnace with multiple mass carbonaceous combustible material inlets around the top of the furnace body and exhaust gas outlets above the furnace body, Bulk carbonaceous combustible material is charged together with waste to form a filling area mainly composed of waste at the lower part of the charging cylinder, and the bulk carbonaceous material is charged from the charging port of the bulky carbon based combustible material. A method for charging a charge for a method of enclosing a filling area of a combustible substance of a system around the filling area mainly composed of the waste, in which the agglomerated carbonaceous combustible substance in the charging cylinder is discarded. It is characterized in that it is distributed in a layered manner alternately with the material, and that a columnar region of a solid carbonaceous combustible substance is formed at the center.

According to the present invention, a plurality of lump carbonaceous combustible substances provided around the waste charging cylinder are charged together with the lump carbonaceous combustible substance together with granular or lumpy noncombustible waste. It can also be applied to an operation method in which granular or massive incombustible waste is charged and distributed in a dense carbon-based combustible substance filling area surrounding a filling area mainly formed of waste just below the charging cylinder. ..

[0010]

In the central packing area mainly composed of waste material under the charging cylinder, a columnar packing area composed only of massive carbonaceous combustible material and a ring-shaped coke layer are formed on the outside thereof. The incineration ash of municipal solid waste has a higher ventilation resistance than coke, and it is difficult for hot gas from the high-temperature hearth to pass through. By forming a ring-shaped coke layer around the columnar filling area of the coke in the charging cylinder, a gas flow that is also effective for preheating the incineration ash is formed.

As a result, the hot combustion gas from the high temperature zone of the hearth passes through the columnar packing zone and exits the ring-shaped coke layer on the outer side thereof. As a result, coke combustion in the central part of the high-temperature hearth is promoted, a ring-shaped U-shaped melting surface is formed in the upper part of the high-temperature hearth, the melting zone surface is expanded, and the processing capacity of the furnace itself is increased.

Further, the dissolution capacity can be further enhanced by charging granular or lumpy non-combustible waste into the coke packed layer outside the charging cylinder at a ratio smaller than that in the central portion.

[0013]

EXAMPLE An example will be described in which the present invention uses combustion ash of municipal waste as a processing waste and coal coke for iron making as a lump carbonaceous combustible substance.

FIG. 1 shows a melting furnace 10 used to practice the present invention.

In FIG. 1, reference numeral 1 denotes a hollow cone-shaped furnace body having an enlarged upper portion, a tuyere 2 is provided at the lower portion thereof, and a taphole 3 is provided at a position lower than the tuyere 2. The waste charging cylinder 4 is inserted from the center of the upper surface of the furnace body, and four coke charging ports 5 are provided at equal intervals around the waste charging cylinder 4 on the upper surface of the furnace body. A plurality of exhaust gas outlets 6 are provided.

In this melting furnace 10, the waste charging cylinder 4
From the center, a block coke B with a diameter of 45 to 75 mm
To form a columnar layer as a _single layer of coke 7 and a mixed charge of powdery municipal waste incineration ash A ₁ and limestone C for adjusting the basicity at the time of melting of the incineration ash. And lump coke B are charged in layers.

As a result, below the waste charging cylinder 4,
A filling area 8 mainly composed of incinerated ash is formed in which the columnar coke single layer in the waste charging cylinder 4 and the surrounding layer area are continuous. Further, a filling area 9 mainly composed of the lump coke B mixed with the granular or massive incineration ash A ₂ charged from the coke charging port 5 is formed so as to surround the filling area 8 mainly composed of the incineration ash.

As a result, the layered region of the massive coke B formed inside the filling region 8 mainly composed of the incinerated ash A ₁ which itself has poor air permeability forms an air passage and is burned by the air blown by the tuyere 2. A part of the combustion gas flow of the heated coke passes from the high-temperature hearth zone 11 to the coke filling zone 9 by passing through the ventilation passage formed by the stack region of the massive coke B as shown by the arrow. Ascend, the incinerated ash in the filling area is efficiently heated and melted and dropped to flow down, and extracted as a slag-like melt from the tap hole 3.

[0019]

According to the present invention, the following effects can be obtained.

(1) Since the amount of combustion gas passing through the waste filling area can be increased, the overall thermal efficiency is improved.

(2) Since the massive fuel is supplied to the high-temperature hearth region in an appropriate amount, the high-temperature region can be sufficiently formed by the combustion with the air from the tuyere, and the fuel Consumption is reduced.

(3) Since the temperature of the exhaust gas is lowered, the deterioration of the attached equipment is reduced.

(4) The amount of melt processing in a furnace having the same capacity is increased, and the furnace is made compact.

[Brief description of drawings]

FIG. 1 shows an embodiment apparatus to which the present invention is applied.

[Explanation of symbols]

 1 furnace body 2 tuyere 3 tap hole 4 waste charging cylinder 5 coke charging port 6 exhaust gas outlet 7 coke single layer 8 filling area mainly composed of waste 9 filling area mainly composed of coke 10 waste melting Furnace 11 High-temperature hearth area

Claims (1)

[Claims] 1. A tuyere is provided in the lower part of a hollow cone-shaped furnace body whose upper part is enlarged and whose inner surface is formed at an angle of repose or more of a massive carbonaceous combustible substance, and a tap hole is provided at a position lower than the tuyere. A waste charging cylinder is inserted from the center of the upper surface of the furnace body so that the tip is located above the tuyere, and a plurality of massive carbonaceous combustible substance charging ports are provided around the waste charging cylinder on the upper surface of the furnace body. In the waste melting furnace with the exhaust gas discharge port above the furnace body, the bulk carbonaceous combustible substance is charged together with the waste from the central waste charging cylinder, and the waste is discharged to the lower part of the charging cylinder. Forming a filling area mainly composed of, and a filling area made of the massive carbon-based combustible substance charged from the charging port of the massive carbon-based combustible substance,
A method for charging a charge for an operation method of surrounding a filling area mainly composed of the waste, wherein the carbonaceous combustible material in the charging cylinder is alternately layered with the waste. At the same time, a method for charging a waste melting furnace in which a columnar region of a mass of carbonaceous combustible material is formed in the center.