JPS621549Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to treat various industrial wastes such as sewage sludge,
Alternatively, if necessary, the intermediately processed materials have been dried and incinerated or pulverized before being incinerated or melted in order to prevent heavy metals from flowing out when used in landfills, or to be used as construction aggregate. More specifically, the furnace is configured to incinerate and melt industrial waste or intermediately treated products thereof in the upper part of a high-temperature hearth made of carbon-based combustible material, and take out the molten material from the lower side of the high-temperature hearth. , relates to an industrial waste melting furnace having an ascending passage for flue gas above the high temperature hearth.

In the above-mentioned melting furnace, if the temperature of the combustion exhaust gas exceeds the softening melting point of the scattered dust such as combustion ash and fine powder released from industrial waste or intermediate processed materials, the scattered dust will fuse to the furnace wall in the upward flow path, which is a disadvantage. Therefore, it is necessary to maintain the temperature of the flue gas within the softening and melting point, but if the temperature of the flue gas is adjusted by adjusting the combustion state in a high-temperature hearth, the processing efficiency will decrease. becomes.

The present invention has been developed in view of the above-mentioned circumstances, and its purpose is to effectively cool combustion exhaust gas and improve processing efficiency.

Therefore, according to the present invention, the water or steam supply port is disposed in the upward passage above the tuyere for supplying the oxygen-containing gas for post-combustion of the combustion exhaust gas, and the supply port An industrial waste melting furnace is provided, characterized in that the opening degree of a nozzle attached to the tip of a pipe passing through the nozzle is controlled based on the temperature of the combustion exhaust gas above the nozzle.

Hereinafter, embodiments of the present invention will be described in detail based on illustrative drawings.

In constructing a melting furnace for incinerating and melting industrial waste, such as sewage sludge, as shown in FIG.
A combustion section 2 for forming a combustion chamber 2 and a molten material take-out furnace body 3 such as a reflective type are installed on a frame 4 in communication with each other near the bottom of the combustion section 2, and the bottom section 2a of the combustion section 2 is opened and closed. The structure can be freely configured so that the combustion slag of coke can be taken out, and the ascending passage 5 for combustion exhaust gas is connected above the high-temperature hearth 1, and the coke slag for forming the high-temperature hearth 1 is provided. The dual-purpose flow path 6 for supplying sludge to the upper surface of the high-temperature hearth 1 is lowered into the exhaust gas ascending flow path 5 with its end supply port 6a located near the top of the high-temperature hearth 1. The sludge and coke packed bed A is formed in the upper part of the high-temperature hearth 1 by connecting the sludge and coke at an angle. The first tuyere 8 for supplying oxygen-containing gas for combustion from a heat exchanger (not shown) for heat utilization is connected to the combustion section 2, respectively.
The sludge is incinerated and melted in the upper part of the high-temperature hearth 1, and the molten material is taken out into the furnace body 3 through the lower part of the high-temperature hearth 1, and the molten material taken out into the furnace body 3 is a second tuyere for appropriately collecting the slag from the first and second slag outlets 9 and 10, and supplying the oxygen-containing gas for combustion after the combustion exhaust gas from the heat exchanger into the ascending passage 5; 11 is provided above the supply port 6a, so that the combustion exhaust gas from the high-temperature hearth 1 is post-combusted, that is, the combustion exhaust gas flows into the packed bed A.
The cyclone 12 for dust removal is connected to the ascending flow path 5 via the exhaust duct 13, and the Provided in a state where it is connected to the heat exchanger,
The exhaust gas is supplied to the heat exchanger after removing the dust contained therein, and the port 14 for supplying water into the ascending flow path 5 is connected to the second tuyere 11.
A water jet nozzle 15 is provided in such a manner that the water jet nozzle 15 is located above the water supply port 14, and the water jet nozzle 15 is provided in a state in which the supply port 14 is inserted, so that the temperature of the combustion exhaust gas after the post-combustion becomes equal to or lower than the softening melting point of the scattered dust. It is designed to cool down like this.

As shown in FIG. 2, the nozzle 15 includes a casing 16 attached to the furnace wall, a supply water guide pipe 17, a spray nozzle tip 18,
Cooling water guide pipe 19 and cooling water discharge pipe 20
are assembled and attached to prevent heat loss.

Further, as shown in FIG. 1, a flow control valve 21 is provided to change and adjust the amount of water supplied to the nozzle 15,
A device 22 for detecting the temperature of the combustion exhaust gas in the ascending flow path 5 is provided, further comprising a temperature detection device 22.
A control mechanism 23 is provided that automatically operates the control valve 21 based on information from the temperature detector 22, and maintains the exhaust gas detection value by the temperature detection device 22 within a set range so as not to fuse the scattered dust to the furnace wall. It's like this.

In addition to sewage sludge, the above-mentioned melting furnace can treat various industrial wastes such as tire scraps, city garbage incineration ash, and waste catalysts, or intermediate products thereof.

Further, when carrying out the present invention and using steam instead of water, the opening 14 may be formed in an inclined shape to allow the steam to flow along the inner surface of the furnace wall, as shown in FIG.

Furthermore, the present invention may be implemented in a manner in which the amount of water or steam supplied is manually adjusted.

Further, the present invention can also be applied to a melting furnace having a configuration that does not include the tuyere 11 for supplying oxygen-containing gas for combustion after combustion exhaust gas.

Furthermore, the specific configuration of the melting furnace used can be modified in various ways. FIG. 4 shows an example of this, in which the side wall for the two portions of the high-temperature hearth is formed into a double pipe structure to constitute a water-cooled jacket 24.

Further, as the carbon-based combustible material forming the high-temperature hearth 2, it is preferable to mainly use coke, but various materials such as briquettes such as anthracite coal, graphite electrode scraps, etc. may also be used.

In summary, the present invention is characterized in that the above-mentioned industrial waste melting furnace is provided with an opening 14 for supplying water or steam into the upward passage 5.

That is, by supplying water or steam into the ascending passage 5, the combustion exhaust gas can be effectively cooled, thereby avoiding the disadvantages of the above-mentioned means for adjusting the combustion state in the high-temperature hearth 1. However, it is possible to improve processing efficiency.

To explain in more detail, another means to achieve the same purpose as the present invention is to cool the combustion exhaust gas by supplying cooling air into the ascending passage 5, but in this case, the present means is In comparison, it is difficult to exert a sufficient cooling effect, and there are disadvantages such as the need to use means for adjusting the combustion state in the high-temperature hearth 1. However, according to the present invention, the desired purpose can be achieved without such disadvantages. can be reached.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the industrial waste melting furnace according to the present invention, in which FIG. 1 is a schematic sectional view, FIG. 2 is a longitudinal sectional side view of a nozzle, and FIG. 3 is a longitudinal sectional side view of another embodiment. FIG. 4 is a schematic sectional view of a melting furnace having a different configuration. DESCRIPTION OF SYMBOLS 1... High-temperature hearth, 5... Rising channel, 11... Tuyere, 14... Water or steam supply port, 15... Nozzle.

Claims (1)

[Scope of utility model registration request] Industrial waste or its intermediate processed material is incinerated and melted in the upper part of a high-temperature hearth 1 made of carbon-based combustible material, and the molten material is taken out from the lower side of the high-temperature hearth 1, and the high-temperature hearth 1
This is an industrial waste melting furnace provided with an ascending passage 5 for flue gas in the upper part, and a water or steam supply port 14 is provided in the ascending passage 5 for supplying oxygen-containing gas for combustion after the flue gas. A configuration in which the opening degree of a nozzle 15, which is disposed above the tuyere 11 and attached to the tip of the pipe passing through the supply port 14, is controlled based on the temperature of the combustion exhaust gas above the nozzle. An industrial waste melting furnace characterized by: