JPS59158909A - Melting furnace for industrial waste - Google Patents

Abstract

PURPOSE:To recover and utilize a large amount of radiant heat from a furnace wall as steam by arranging a jacket boiler drum to not only a section corresponding to the upper section of a hearth at a high temperature but also a section corresponding to the lower section of a rising flow path. CONSTITUTION:The circumferential wall of a furnace 1 is formed by a jacket boiler drum 6 extending over a lower end section from a section upper than a position penetrating a hopper 2 to the furnace 1, and the hopper 2, a nozzle 5, a burner 7 for ignition, a tuyere 9 forming cylinder, a meltage discharge path 12 forming cylinder, etc. are penetrated and fixed to an external metallic wall 6a and an internal metallic wall 6b. A feedwater pipe 14 is connected to the lower end side of the jacket boiler drum 6 and a steam recovery pipe 15 and a safety valve 16 to the upper end side, and steam generated by the jacket boiler drum 6 by heat from the inside of the furnace 1 is fed to an industrial waste spare drier as a dried heat source from the steam recovery pipe 15 while a gas temperature in a rising flow path 8 is cooled at a temperature, preferably, approximately 800-900 deg.C, in order to inhibit the generation of NOx and clinker.

Description

[Detailed Description of the Invention] Is the present invention applicable to industrial waste or intermediate treatment thereof? , is configured to melt in a high-temperature hearth made of carbon-based combustible material, is configured to take out the molten material from the high-temperature hearth, and has an ascending passage for combustion exhaust gas above the high-temperature hearth. relates to secondary industrial waste melting furnaces.

In the above-mentioned industrial waste melting furnace, the part of the furnace peripheral wall corresponding to the upper part of the high-temperature hearth becomes extremely high temperature.
As shown in the figure, a part of the furnace peripheral wall was completely water-cooled to protect the furnace (1) from heat damage.
However, the technical intention of the water-cooled jacket I311 is not simply to prevent abnormal temperature rises on the peripheral wall of the reactor, but in order to do so, the pump <P) VC generates a large amount of water. In addition to circulating the water cooling jacket L''11VC, it is cooled with hot water from the water cooling jacket 32, and the temperature of the hot water is too low for later use.
As a result, the total heat input to the furnace (1) becomes as low as J to 10, and there is room for improvement in terms of energy conservation.

In addition, conventionally, high-temperature hearth (1000
Combustion exhaust gas gold above °C, cooling medium such as combustion exhaust gas or water after cooling? NOx generation and clinker generation can be suppressed by supplying the rising flow path (81) from the nozzle (1).
It was cooled to about 00℃ or 0θ℃, but for example, the amount of exhaust gas was about 2 times the amount of gas generated in the melting process.
This increases the heat loss of the exhaust gas, increases the size of the exhaust gas treatment equipment, and increases the operating cost of the equipment.
Overall, there was room for improvement in terms of energy saving, initial cost, and running cost.

In view of the above-mentioned circumstances, the purpose of the present invention is to protect the furnace and lower the temperature of the combustion exhaust gas, while reducing the total heat loss through extremely rational modification, as well as equipment costs and operating costs. ? The point is to make it possible to reduce it effectively.

Characteristic h' of the industrial waste melting furnace according to the VC of the present invention consists of at least industrial waste or its intermediate processed material? In the part corresponding to the upper part of the high-temperature hearth made of carbon-based combustible material to be melted, and in the part corresponding to the lower part of the ascending passage for flue gas above the high-temperature hearth, the furnace peripheral wall consists of a jacket boiler shell. Its functions and effects are as follows.

In other words, is the jacket boiler body used as a careful structure to prevent furnace wall meltdown? In addition, by arranging the entire jacket boiler body not only in the area corresponding to the upper part of the high-temperature hearth but also in the area corresponding to the lower part of the ascending passage, a large amount of heat dissipated from the furnace wall, which was previously wasted, can be completely dissipated. Moreover, it can now be collected and used as steam with high utility value. In addition, the combustion exhaust gas from the high-temperature hearth can be cooled down to a temperature VC that is at or near the temperature VC that can sufficiently suppress NOx by the action of the jacket boiler body, and the supply of cold exhaust gas and water for cooling the exhaust gas. Eliminate or large T
'lJ Vc decrease becomes oT ability, and as a result,
Is the amount of exhaust gas significantly reduced and heat loss due to exhaust gas? VC exhaust gas treatment can be significantly reduced! J! Facility? Can it be sufficiently miniaturized and have low operating costs? It was made with a large VC reduction.

Furthermore, the steam obtained from the jacketed boiler body can be used to pre-dry industrial waste and pre-heat combustion air.The metal body is extremely energy efficient and saves initial and running costs. However, it has become possible to provide corpses with an extremely excellent industrial waste melting furnace that has excellent σ, tl-1, durability, and environmental hygiene.

Next, FIG. 1 and FIG. 2 show an example of J.

Is there industrial Fs mulberry material and carbon-based combustible materials in the upper and lower intermediate positions of the vertical furnace IL+? Hopper to feed (2) gold, double dan, (
-1:112 through which a high-temperature hearth (8) is formed at the bottom of the furnace by the carbon-based combustible material from the hopper (21), and a packed bed of industrial waste ( B)? It is configured to form.

Combustion blast from blower (4)? The nozzle (ffil 'ji') that supplies the high-temperature hearth A) is installed in the Fill with its outlet placed below the top surface of the high-temperature hearth (Q), and the ignition burner (7) is installed in all units. It is attached to F city in (1).

The upper part of the furnace (1) is used as the ascending passage (8) for combustion exhaust gas, and the upper part of the furnace (1) is used as the ascending flow path (8) for combustion exhaust gas. Is there air from the blower (4) at the bottom of #-Flow 1i+81? Tuyeres supplied for after-combustion [91i connected,
The ascending flow path (81) is connected to a cyclone (1CA"r duct) for collecting waste dust.

No odor in the melt discharge path at the bottom of the furnace? Connect and melt industrial waste in a high temperature hearth? In addition to configuring it so that it can be collected,
Hearth bottom? A lid Q that can be opened and closed is provided so that the residue of carbon-based combustible substances can be taken out.

From above to the lower end of the hopper (2) penetration position relative to tPU+, cover the furnace peripheral wall with the jacket boiler 1 (
6), a hopper (2), a nozzle (6), an ignition burner (7), a tuyere (9) forming cylinder, a melt discharge passage (12
) Forming a cylinder, etc., the outer metal wall (6a) and the inner metal wall (6b) of the jacket boiler body (6) are penetrated and fixed. Warp, water supply pipe 04) on the lower end side of the jacket boiler body (6)? , and the steam recovery pipe (U5) and the safety valve (06) are all connected to the upper end side, so that the steam generated in the Eli jacket boiler body (6) is absorbed by the heat from inside the furnace, and the steam recovery pipe (+5) is connected to the upper end side. 7) It is configured to supply the industrial waste pre-drying equipment (not shown) as a drying heat source, and the rising flow path (81 gas temperature?, desirably 200 mm) in order to completely suppress the generation of NOx and talin It is configured to be cooled by a jacket boiler shell (6) to about 0.degree.

A sensor Q7j' is installed at the top of the jacket boiler body (6) to detect the internal water level, and a controller α9 automatically opens and closes the water supply pipe O grape pulp (1 barrel) based on the water level detected by the sensor H. The detection water level is set at the lower limit (L+).
When it reaches the upper limit (L), the pulp (+8)'e opens, and when the detected water level reaches the set upper limit (L), the pulp (close the country, water level?
It is configured to automatically maintain within a set range.

The part of the upper part of the jacket boiler body (6) that corresponds to the water level fluctuation range? , disposed outside with an annular gap (21) to the upper part (e) of the furnace peripheral wall made of refractory metal main paulownia, and sealing the upper part of the gap (21) with sealing material L22+,
The air from the blower (4) is configured to be sent to the ascending passage (8) via the air supply pipe, gap force) and vane (24), and thereby the jacket boiler body (6). In order to completely prevent thermal erosion of the upper end of the tuyere, do you use exhaust gas from the air from the tuyere cutting? This allows for cooling.

On the inlet side of the exhaust gas (11), a sensor (company) for detecting exhaust gas temperature sound is provided, and an exhaust gas return flow path η is provided to supply cooled exhaust gas from the slat (26) to the ascending flow path (8). A pulp (c)?controller cl!9 for controlling the amount of exhaust gas reduction is installed to maintain the temperature detected by the sensor (2) within the set range, so that the temperature of the exhaust gas can be completely controlled. 3, jacketed boiler body (s + k), hopper (21
t) are formed so that they become larger upwardly so that the hole corresponding to the high temperature hearth hole of the shaft boiler body (6) is not cooled too much, and the high temperature hearth (A) It is configured so that the combustion air is evenly supplied to the upper part, and the linear velocity of the exhaust gas in the furnace tll is made small so as to reduce dust scattering. Also, the upper part of the jacket boiler body (6)? , the distance between the walls Cl2) K is sufficiently larger than that of the lower part, so that the exhaust gas can be cooled completely stably. As shown in FIG. 2, a large number of recesses (2) are formed in the portion of the inner wall (6b) that contacts the high-temperature hearth hole, and the high-temperature hearth ( The structure is designed to reduce the amount of nitrogen released and facilitate melting and melt flow.

The industrial Db material inputted from hopper (2) is, for example, various industrial wastes such as sewage sludge, tire scraps, municipal garbage incineration ash, and waste catalysts, as well as intermediately processed products.
Examples of the carbon-based combustible material include coke, briquettes such as anthracite, graphite electrode scraps, and the like.

Next, another example will be shown.

The installation range of the jacket boiler body (6) should be at least the range corresponding to both hot hearths (the upper part of Al and the lower part of the ascending passage (8)), and the range corresponding to the high temperature hearth (the temperature of Al and exhaust gas, etc.). It can be determined as appropriate depending on the situation.

How to utilize all the steam obtained from the 11th jacket boiler +e+ can be changed as appropriate depending on the situation.

A steam/water tank may be placed above the jacket boiler body (6) separately from the jacket boiler body (6), and 17 tons of water may be filled inside the jacket boiler body (6).

[Brief explanation of the drawing]

Are Figures 1 and 2 examples of the present invention? 1 is a schematic vertical sectional view of the entire furnace, and FIG. 2 is an enlarged sectional view. FIG. 8 is an overall schematic vertical sectional view of a conventional furnace. (6)...Jacket boiler body, (8)...
. . . Rising channel for combustion exhaust gas, (A) . . . High-temperature hearth. Figure 1 48- Figure 3

Claims (1)

[Claims] Industrial waste or its intermediate treatment? , is made of carbon-based combustible material and is configured to be melted in a dangerously high temperature hearth, and has a structure for taking out the molten material from the high temperature hearth. Rising channel (8)
An industrial waste melting furnace equipped with
) is the jacket boiler body (6)
Industrial waste melting furnace consisting of.