JPH04122929U - Incineration ash melting processing equipment - Google Patents

Abstract

(57) [Summary] [Structure] In a melting furnace 1 that melts incinerated ash 4 etc. by arc heating, combustible gas generated in the furnace is combusted by blowing air preheated to 500°C or higher into the furnace. . Further, a heat exchanger 16 was provided in the exhaust gas discharge path, and the air was preheated by the heat exchanger. [Effect] By blowing heated air into the furnace, the combustible gas in the furnace can be more completely combusted without lowering the temperature inside the furnace. As a result, there is no risk of explosion within the furnace, allowing safe operation, and effective use of thermal energy results in energy savings and reduced running costs.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention detoxifies garbage incineration ash, sludge, etc. by heating and melting it. This relates to incineration ash melting processing equipment.

0002

[Conventional technology]

The incinerated ash melting method, which involves putting incinerated ash into a melting furnace such as an arc furnace and heating the incinerated ash to 1000°C to 1600°C and melting it, prevents the diffusion of harmful substances contained in the incinerated ash. As a result, it is already playing a role in pollution prevention measures. In the above-mentioned melting furnace, combustible gases such as H ₂ and CO are generated due to thermal decomposition when the incinerated ash is melted, so in order to avoid explosions, air is blown into the furnace and the gases are combusted at the same time as they are generated. I have to.

0003

[Problem that the idea aims to solve]

By the way, when air is blown into the furnace, the temperature inside the furnace decreases rapidly, and the ignition temperature of CO ( (approximately 600℃) and the danger of explosion due to incomplete combustion cannot be eliminated. Or, in order to compensate for the amount of heat, the consumption of electric power for arc heating increases and the running There was a problem of increasing costs.

0004

[Means to solve the problem]

The incinerated ash melting processing equipment of the present invention is intended to solve the above problems. In a melting furnace where metals are melted by arc heating, air preheated to 500°C or higher is heated to The flammable gas generated in the furnace was combusted by blowing it into the furnace. This is the first feature. In addition, the present invention enables exhaust gas to be used in a melting furnace that melts incinerated ash etc. by arc heating. A heat exchanger is installed in the exhaust path, and air preheated by the heat exchanger is blown into the furnace. The second feature is that the flammable gas generated in the furnace is combusted. It is something that

[0005]

[Effect]

By blowing air at a temperature of 500℃ or higher, the temperature inside the furnace is prevented from dropping and the flammable gas is completely burned out. Let it bake. In addition, by preheating the air blown into the furnace through heat exchange with the exhaust gas, Thermal energy possessed by the gas can be used effectively.

[0006]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings. In the melting furnace 1 shown in FIG. 1, three electrode rods 2 are suspended from the top into the furnace. Incineration ash 4 is introduced through the chute 3, and is heated by the arc between the electrode rods 2. The incineration ash 4 is heated to 1000°C to 1600°C to melt it and form a molten material 5 at the bottom of the furnace. The molten material 5 is discharged out of the furnace from a tap 6. 7 is on the ceiling of melting furnace 1 This is an exhaust gas outlet provided.

[0007] Reference numeral 8 denotes air inlets provided at multiple locations around the upper part of the side wall of the melting furnace 1; An air supply pipe 9 whose tip is connected to the port 8 is provided with a heater 18 and an air supply fan 10. It is. Therefore, the air sucked from the atmosphere by the air supply fan 10 is transferred to the heater 1. 8 to heat it to 500° C. or higher and blow it into the furnace space 11 from the blowing port 8 .

[0008] In the furnace space 11, flammable gas generated by heating the incinerated ash 4 is blown into the furnace space 11. It reacts with the air blown in from the port 8 and burns. Preheat to over 500℃ like this By blowing air into the furnace, the temperature inside the furnace can be maintained at a high temperature. Even if the amount is small, CO can be completely combusted, thus keeping the oxygen concentration in the furnace to a low value. As a result, oxidative consumption of the electrode rod 2 is also reduced.

[0009] Note that the exhaust gas discharged from the exhaust port 7 is sucked by the exhaust gas fan 12 and Play water spray type cooling tower 13, cyclone type separator 14, bag filter type dust The dust in the exhaust gas is separated and collected by passing through the device 15. Only exhaust gas is emitted into the atmosphere.

0010 The incinerated ash melting treatment equipment shown in Figure 2 is installed in the exhaust gas exhaust path connected to the exhaust gas outlet 7. A heat exchanger 16 is provided, and the heat exchanger 16 is passed in place of the heater 18 in the embodiment of FIG. Preheated air is blown into the furnace space 11 from the air inlet 8. It is. The temperature of the exhaust gas discharged from the exhaust gas outlet 7 is 1000℃ to 1300℃ It also reaches the temperature, so it is blown into the furnace space 11 by passing through this heat exchanger 16. The air used can be preheated to at least 500°C or higher. Therefore, in this embodiment, the exhaust gas It is possible to save energy by effectively utilizing the thermal energy of the heat exchanger. The spray water atomization can reduce the temperature of the exhaust gas by passing through the exchanger 16. There is no need to particularly increase the cooling capacity of the cooling tower 13 and the like.

[0011]

[Effect of the idea]

In this way, the incineration ash melting treatment equipment of this invention blows pre-heated air into the furnace. This allows the combustible gas to be burned more completely without lowering the temperature inside the furnace. I can do that. This eliminates the risk of explosion inside the furnace, allowing safe operation, and Achieving energy savings and reducing running costs through effective use of energy It is useful that it can be done.

[Brief explanation of drawings]

FIG. 1 is a gas system route diagram showing an embodiment of the incineration ash melting processing equipment of the present invention.

FIG. 2 is a gas system diagram showing another embodiment of the incineration ash melting treatment equipment of the present invention.

[Explanation of symbols]

1 Melting furnace 2 Electrode rod 4 Incineration ash 5 Melt 7 Exhaust gas outlet 8 Air inlet 9 Air supply pipe 10 Air supply fan 11 Furnace space 12 Exhaust gas fan 16 Heat exchanger 18 Heater

Claims (2)

[Scope of utility model registration request] [Claim 1] A melting furnace for melting incinerated ash etc. by arc heating, characterized in that combustible gas generated in the furnace is combusted by blowing air preheated to 500°C or higher into the furnace. Incineration ash melting processing equipment. Claim 2: In a melting furnace that melts incinerated ash, etc. by arc heating, a heat exchanger is provided in the exhaust gas discharge path, and air preheated by the heat exchanger is blown into the furnace to reduce the combustible material generated in the furnace. Incineration ash melting processing equipment characterized by being designed to combust toxic gas.