JP2000102777A - Heating system for waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the discharge of carbon dioxide causing global warming by using oxyhydrogen gas as main fuel or auxiliary fuel for a burner to decrease the released heat capacity of combustion gas to easily cool in heating system by melting or incinerating waste with the burner. SOLUTION: Incineration ash from an incineration ash hopper 2 and a thermit reaction agent from a melting agent hopper 3 are respectively supplied to a reaction furnace 1 and are mixed and pushed into the furnace by a pusher 4. The incineration ash and the melting agent are heated by the burner 5 and at a point of time to reach the thermit reaction starting temp., the exothermic reaction is started. After that, the molten mixture of the incineration ash with the melting agent is stored in a slag reservoir 5 and falls down into waster to be solidified. At this time, a waste gas generated by heating with the burner is sent to a gas cooling chamber 8 through a waste gas pipe 7 and cooled with water shower. The cooled waste gas is sent to a bag filter 9 to remove dust contained in the water gas and is discharged to the air from a stack.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste heat treatment system.

[0002]

2. Description of the Related Art Waste such as ordinary waste and industrial waste is usually incinerated by a burner using heavy oil or LPG as fuel. Recently, heavy oil and LPG burners have also been used in the process of melting ash after incineration to vitrify. However, heating by burning these fossil fuels has the problem that the combustion efficiency of the waste heat treatment furnace is poor, There are two types of fatal problems: the problem of emitting large amounts of carbon dioxide, which is the cause of global warming. Further, as a secondary problem, the flue gas from the heat treatment furnace is usually cooled by a water shower, but there is a problem that the water shower cannot efficiently cool the exhaust gas.

[0003] In the heat treatment of waste, air is used for combustion, so that a large amount of exhaust gas is generated, is cooled by a water shower, passes through a dust collector, and is released to the atmosphere. The waste heat of the exhaust gas is large, causing a decrease in combustion efficiency. The main component of the exhaust gas is nitrogen gas,
Since carbon dioxide is a gas with a large specific gravity and a large heat capacity, the release of the combustion gas eventually releases a gas with a large heat capacity to the outside, which lowers the combustion efficiency. That is one of the reasons. The large heat capacity of the carbon dioxide gas means that the carbon dioxide gas is a gas having a large adiabaticity and is hardly cooled and hardly cooled. This is why the exhaust gas is hardly cooled. Fundamentally, in order to increase the combustion and cooling efficiency,
It is necessary to reduce the combustion air (nitrogen) and the heat capacity of the exhaust gas. The problem of global warming is that it does not emit carbon dioxide.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to reduce the amount of heat released from combustion gas, facilitate cooling, and reduce carbon dioxide gas which is a cause of global warming. And a new heat treatment system that does not emit wastewater.

[0005]

Means for Solving the Problems The present inventor has made intensive studies on the above problems and has obtained the following findings. That is, when the heating system is configured to burn hydrogen gas, carbon dioxide gas is not generated, water is generated, the heat capacity of water vapor is about 1 / (2 to 3) of carbon dioxide gas, and the heat released from exhaust gas is reduced by a fraction. And found that the cooling efficiency can be improved several times. In addition, if hydrogen gas is used in the form of hydrogen gas generated by electrolysis of water and mixed with oxygen generated at the same time, it is not necessary to supply fresh air to burn it. It turned out that only. The amount of exhaust gas generated by the chemical reaction was found to be such that only 1 mol of exhaust gas (steam) was generated from 1.5 mol of the mixed gas in the case of an oxygen-hydrogen mixed gas. On the other hand, in the case of fossil fuel, for example, in the case of LPG, for example, 6 mol of mixed gas (with oxygen) generates 7 mol of exhaust gas, the amount of exhaust gas escaping to the outside increases, and the amount of heat escaping outside increases. It turns out that it will increase in minutes. The present invention has been made based on the above findings, and has the following configuration. A heat treatment system for melting or incinerating waste using a burner, wherein oxyhydrogen gas is used as a main fuel or an auxiliary fuel for the burner. In a heat treatment system that uses a burner to melt or incinerate waste and cool exhaust gas with a water shower,
A waste heat treatment system using oxyhydrogen gas as a main fuel or an auxiliary fuel for the burner. The treatment system according to the above or the above, wherein the heat treatment is a melting treatment of incineration ash. The treatment system according to the above or the above, wherein the heat treatment is a waste incineration treatment.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION It is economical to use hydrogen gas by decomposing water into oxygen and hydrogen, and using it in the form of a mixed gas of oxyhydrogen. A volatile hydrocarbon may be added to the oxyhydrogen mixed gas to be used, if necessary. For example, volatile hydrocarbons such as alcohol, hexane, toluene, and acetone may be added for the purpose of coloring the flame or adjusting the amount of heat. The amount of addition may be about 0.5 to 1.5 with respect to the oxyhydrogen gas 2 by volume ratio, appropriately adjusted according to the intended use, and added.

The amount of the exhaust gas is discharged from 1.5 mol to 1 mol of the oxyhydrogen mixed gas. In the case of fossil fuels, LPG
When oxygen is mixed, 7 moles of exhaust gas from 6 moles of the mixed gas is mixed, and when air is mixed, the heat of combustion is consumed to heat four times as much nitrogen as oxygen and released to the atmosphere. Therefore, the thermal efficiency becomes worse. The present invention reduces the absolute amount of exhaust gas by using oxyhydrogen mixed gas,
Further, the amount of heat dissipated to the atmosphere is reduced by reducing the heat capacity of the exhaust gas.

[0008] The cooling of the exhaust gas is usually performed by a water shower, but in the present invention. Since the heat capacity of the exhaust gas is several times smaller than that of the conventional exhaust gas, the cooling by the water shower is more effective. Further, since the water vapor of the exhaust gas has an affinity for water, the water vapor is easily absorbed by touching the water droplets of the shower, and the cooling efficiency is greatly improved.

[0009] The combustion system of the present invention melts incineration ash of a refuse incinerator, incinerates waste from homes and industrial waste,
It is also effective as a heating method for the direct melting treatment of waste. In particular, it is extremely suitable for melting incineration ash discharged from a refuse incinerator. At present, electric furnaces such as plasma furnaces and arc furnaces are often used to treat incinerated ash, but have the disadvantage of extremely high processing costs. The method of the present invention is characterized in that the processing cost is extremely low as compared with the electric furnace method. This is a very advantageous method for melting incineration ash. The heating method of the present invention may be used alone, or may be used as an auxiliary heating means of a currently used incinerator. That is, it may be used as an auxiliary fuel for a furnace heated with heavy oil or gas fuel. It is also very effective as an auxiliary heating means of a melting furnace using the thermite reaction used for melting incineration ash. This is a method in which a thermite reactant is mixed into incineration ash, heated to cause a reaction, and the ash is melted by the heat of the reaction.However, when the ash surface is heated with an oxyhydrogen mixing burner in this reactor, There is a feature that the fluidity of the melted glass is improved and the amount of melting per time is increased.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory view when the present invention is applied to a melting furnace for melting incineration ash of an incinerator by using thermit reaction heat in combination with burner heating. The reactor is supplied with incinerated ash from an incinerated ash hopper and thermit reactant from a melt hopper, mixed, and pushed into the furnace with a pusher. The pushed incineration ash and the melting agent are heated by a burner. When the temperature reaches the thermite reaction start temperature (approximately 900 to 1100 ° C.), an exothermic reaction starts and the temperature of the mixture of the incineration ash and the melting agent rises and is heated by the burner. Begins to melt from the surface where it is. The mixture of the melted incineration ash and the melting agent flows downward and accumulates in the slag reservoir, falls into water and solidifies. The process proceeds by sequentially repeating the above steps. Exhaust gas generated by the burner heating is cooled by being showered with water in a gas cooling chamber through an exhaust gas pipe. The cooled exhaust gas contains dust, which is removed by a bag filter and released to the atmosphere through a chimney.

When the oxygen-hydrogen mixed gas burner of the present invention is used, a mixture of incineration ash and a melting agent (thermite reactant) can be used at a rate of about 2 hours per hour as compared with a conventional burner (LPG).
It could be dissolved twice. Fuel cost was about 1/3 of conventional LP gas.

[0012] The amount of exhaust gas discharged from the exhaust gas pipe was reduced to about 1/2 compared with the use of a conventional burner (LPG). The amount of water in the exhaust gas cooling chamber could be reduced to about 1/3.

In this embodiment, hexane 1 is mixed with oxygen-hydrogen mixed gas (hydrogen: oxygen = 2: 1) 2 produced by electrolyzing water.
Was used.

[0014]

The present invention has the following effects. The amount of exhaust gas is greatly reduced (1/2 to 1/3). The heat capacity of the exhaust gas is reduced (1/2 to 1/3). The throughput per hour is greatly improved. Fuel costs are reduced. Exhaust gas cooling efficiency is improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

[Explanation of symbols]… Reactor… Incinerator hopper… Molten hopper… Pusher… Burner… Slag reservoir… Exhaust gas pipe… Exhaust gas cooling chamber… Bag filter

Claims (4)

[Claims] 1. A heat treatment system for melting or incinerating waste using a burner, wherein oxyhydrogen gas is used as a main fuel or an auxiliary fuel for the burner. 2. A heat treatment system in which waste is melted or incinerated by using a burner and exhaust gas is cooled by a water shower, wherein oxyhydrogen gas is used as a main fuel or an auxiliary fuel of the burner. Heat treatment system. 3. The treatment system according to claim 1, wherein the heat treatment is a melting treatment of incineration ash. 4. The treatment system according to claim 1, wherein said heat treatment is a waste incineration treatment.