JP2004163031A - Gasification melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasification melting furnace preventing damage inside the furnace, increase in combustion costs and increase in dioxin concentration by uniformizing a flow of exhaust gas inside the furnace. <P>SOLUTION: The gasification melting furnace 3 treating general and industrial waste has exhaust ports 9-1, 9-2 for the exhaust gas and two or more series of devices for treating the exhaust gas. Depending on the situation of the exhaust gas in each of the series, a flow of the exhaust gas in the both series are uniformized by controlling the flow of the exhaust gas independently for each series, and the flow of the exhaust gas inside the gasification melting furnace 3 is uniformized. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gasification and melting furnace for uniformly controlling the flow of exhaust gas generated during the processing of general waste and industrial waste.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a gasification and melting furnace for treating general waste and industrial waste, as a method of treating exhaust gas, exhaust gas discharged from a coke bed type gasification and melting furnace is discharged through an exhaust gas outlet (rising pipe) at one location. Alternatively, suction was performed at two locations, but the exhaust gas treatment equipment was one line.
[0003]
FIG. 2 is a diagram showing an example of a conventional gasification and melting furnace having one exhaust gas outlet. In the example shown in FIG. 2, in the gasification and melting furnace 100, air or LPG is blown from a tuyere 102 into coke disposed at the bottom of the furnace, and general waste is processed by burning industrial waste. Exhaust gas flow 101 in a reducing atmosphere generated by gasification melting and burning of general waste in 100 is supplied to gas combustion chamber 103 through one riser pipe 104 (exhaust gas discharge port). The waste gas is processed by a series of exhaust gas treatment devices from the combustion chamber 103 to an exhaust fan (not shown).
[0004]
FIG. 3 is a diagram showing an example of a conventional gasification and melting furnace having two exhaust gas outlets. In the example shown in FIG. 3, in the gasification and melting furnace 200, air or LPG is blown from a tuyere 202 into coke disposed at the bottom of the furnace, and general waste is treated by burning industrial waste. The flow 201 of the exhaust gas in the reducing atmosphere generated by the gasification melting and burning of the general waste etc. in the inside 200 is passed through the two risers 204-1 and 204-2 (exhaust gas discharge ports) to form the gas combustion chamber 203. And is processed by a series of exhaust gas treatment devices from the gas combustion chamber 203 to an exhaust fan (not shown).
[0005]
[Problems to be solved by the invention]
As shown in FIG. 2, among the conventional gasification and melting furnaces, as shown in FIG. In the case of controlling the exhaust gas by sucking the exhaust gas, the exhaust gas 101 in the gasification and melting furnace 100 is deflected and the temperature distribution and the pressure distribution in the gasification and melting furnace 100 are different, so that the damage in the furnace, the increase in the combustion cost, the increase in the dioxin concentration, etc. There was a problem.
[0006]
Further, as shown in FIG. 3, in the case where the gasification melting and the exhaust gas outlet from the inside of 200 are two places, and the exhaust gas treatment equipment in the post-process such as the gas combustion chamber 203 is a single line, the gasification The flow of the exhaust gas 201 in the melting furnace 200 is uniform, but the pressure is generated up to the gas combustion chamber 203 due to the temperature distribution and the pressure distribution of one riser pipe 204-1 or 204-2, so that the two Differences in the amount of exhaust gas flowing into the gas combustion chamber 203 via the risers 204-1 and 204-2 cause pulsation combustion, resulting in problems such as damage in the furnace, an increase in combustion cost, an increase in dioxin concentration, and the like. was there.
[0007]
The present invention solves the above-mentioned problems and makes the flow of the exhaust gas in the furnace uniform, so that gasification and melting that can eliminate damage in the furnace, increase in combustion cost, increase in dioxin concentration, etc. The purpose is to provide a furnace.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a gasification and melting furnace of the present invention is a gasification and melting furnace for treating general waste and industrial waste, in which two or more exhaust gas outlets and treatment devices are provided. According to the situation of exhaust gas, the flow of exhaust gas in both lines is equalized by controlling the flow of exhaust gas independently for each series, and the flow of exhaust gas in the gasification and melting furnace is made uniform. I do.
[0009]
In the gasification and melting furnace of the present invention described above, two or more exhaust gas discharge ports and treatment facilities are provided, and the flow of exhaust gas is controlled independently for each series according to the status of exhaust gas in each series. In addition, the flow of the exhaust gas in both systems can be made uniform, and the flow of the exhaust gas in the gasification and melting furnace can be made uniform. As a result, the temperature distribution, melting distribution, pressure distribution and the like in the gasification and melting furnace can be made uniform, and damage in the furnace, increase in combustion cost, increase in dioxin concentration, and the like can be eliminated.
[0010]
As an example of a preferred embodiment of the present invention, according to the temperature distribution of the exhaust gas, according to the pressure distribution, automatically or manually operate a damper and an exhaust fan, the exhaust gas discharged from the gasification and melting furnace for treating waste. The flow may be controlled to be even. As described above, the temperature distribution and the pressure distribution of the exhaust gas are used as the status of the exhaust gas serving as a control standard, and the gasification and melting are more preferably performed by automatically or manually operating the dam bar and the exhaust fan as a specific control method. The flow of exhaust gas in the furnace can be made uniform.
[0011]
Further, as another example of the preferred embodiment of the present invention, as a treatment facility for exhaust gas generated when treating waste, a gas combustion chamber, a cooling tower, a bag filter, an exhaust tower, a dambar, an exhaust gas, etc. May be independently provided in a plurality of rows for each system. In this example, the configuration of the gasification and melting furnace of the present invention can be optimized, and the flow of exhaust gas in the gasification and melting furnace can be more preferably made uniform.
[0012]
Further, as another example of a preferred embodiment of the present invention, there are provided a plurality of exhaust gas outlets symmetrically, and a plurality of exhaust gas treatment facilities provided in the same number as the number of exhaust gas outlets. In any case, the configuration of the gasification and melting furnace can be optimized, and the flow of the exhaust gas in the gasification and melting furnace can be made more uniform.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic view of the gasification melting furnace of the present invention.
[0014]
The gasification and melting furnace 3 shown in FIG. 1 is a coke bed type gasification and melting furnace for treating general waste, industrial waste, and the like. Etc. to burn general and industrial waste. Then, the exhaust gas 1 in the reducing atmosphere generated as a result of the combustion is processed through two riser pipes (exhaust gas outlets) 9-1 and 9-2 by two sets of exhaust gas treatment devices provided respectively. In this example, the two exhaust gas treatment apparatuses are constituted by gas combustion chambers 4-1 and 4-1, cooling towers 5-1 and 5-2, bag filters 6-1 and 6-2, and exhaust towers 7-1 and 7. -2 and the dam bars 8-1 and 8-2.
[0015]
The feature of the gasification and melting furnace of the present invention is that the gasification and melting furnace 3 includes the two risers 9-1 and 9-2 in the configuration of the gasification and melting furnace 3 described above, and the two risers 9-1 and 9-. The second point is that an exhaust gas treatment device for treating the exhaust gas is provided separately for each. Then, two risers 9-1, 9-2 and two systems according to the condition of the riser 9-1, 9-2 and the exhaust gas in the exhaust gas treatment device, preferably, the temperature distribution and the pressure distribution of the exhaust gas. The flow of the exhaust gas is controlled independently for each system of the exhaust gas treatment device, preferably by automatically or manually operating the dampers 8-1 and 8-2 and the exhaust fans 10-1 and 10-2. Thus, the flow of the exhaust gas in both systems is made uniform, and the flow of the exhaust gas in the gasification and melting furnace 3 is made uniform.
[0016]
In the above-described embodiment, the control of the dampers 8-1 and 8-2 and the exhaust fans 10-1 and 10-2 is, for example, connected to the riser 9-1 and the riser 9-1 in the first system. When the temperature or pressure of the exhaust gas treatment device is high, the opening degree of the damper 8-1 and / or the amount of exhaust air from the exhaust fan 10-1 is increased, thereby increasing the riser pipe 9-1. When the temperature and pressure of the exhaust gas treatment device connected to the riser 9-1 are low, the opening degree of the damper 8-1 is reduced and / or the amount of exhaust air from the exhaust fan 10-1 is reduced. Can be implemented. The same applies to the second system. For situations other than the above, the control method of the dampers 8-1 and 8-2 and / or the exhaust fans 10-1 and 10-2 is determined in advance for all possible patterns. can do.
[0017]
In the above-described embodiment, the same number of exhaust gas treatment systems and the same number of risers are provided, and a plurality of risers are provided symmetrically with respect to the gas melting furnace. It is more effective in making the flow of exhaust gas in the apparatus uniform, and in making the gas melt and the flow of exhaust gas therein uniform.
[0018]
In the above-described embodiment, the temperature distribution of the exhaust gas and the pressure distribution of the exhaust gas are used as the status of the exhaust gas serving as the control standard, and the actual control is performed by automatically or manually operating the damper and the exhaust fan. The above example is an example, and the present invention is not limited to the above-described example. Further, in the above-described embodiment, an example in which the number of risers serving as exhaust gas outlets is two and the number of exhaust gas treatment devices is two has been described. However, the number of these risers is not limited to two. Further, the number of systems of the exhaust gas treatment device is not limited to two.
[0019]
【The invention's effect】
As is clear from the above description, according to the present invention, in the process of treating waste in a gasification and melting furnace for treating general waste and industrial waste, a series of processes for treating exhaust gas generated is performed by gas combustion. By providing two or more lines from the chamber to the exhaust fan and two or more outlets, the temperature distribution, melting distribution, and pressure distribution in the furnace can be made uniform and the exhaust gas flow can be controlled to be uniform. Will be able to
[0020]
Further, by making the flow of exhaust gas in the furnace uniform, it is possible to suppress damage in the furnace, and it is possible to greatly reduce the cost of refractories used in the gasification and melting furnace.
[0021]
Furthermore, since the exhaust gas temperature can be maintained at a high temperature of 320 ° C. to 2600 ° C. due to the uniform temperature distribution, the dioxin concentration is significantly reduced, and the high-temperature exhaust gas flows to the gas combustion chamber. This provides an extremely excellent effect.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an example of a gasification and melting furnace of the present invention.
FIG. 2 is a diagram showing a configuration of an example of a conventional gasification and melting furnace.
FIG. 3 is a diagram showing the configuration of another example of a conventional gasification and melting furnace.
[Explanation of symbols]
1 Exhaust gas flow 2 Tuyere 3-1 and 3-2 Gasification and melting furnace 4-1 and 4-2 Gas combustion chamber 5-1 and 5-2 Cooling tower 6-1 and 6-2 Bag filter 7-1 7-2 Exhaust tower 8-1, 8-2 Dambar 9-1, 9-2 Rise pipe (gas outlet)
10-1, 10-2 Exhaust air ventilator

Claims (5)

In a gasification and melting furnace for treating general waste and industrial waste, two or more exhaust gas outlets and treatment devices are provided, and the flow of exhaust gas is independent for each system according to the status of exhaust gas in each system. The gasification and melting furnace is characterized in that the flow of the exhaust gas in both systems is made uniform by controlling the flow rate of the exhaust gas and the flow of the exhaust gas in the gasification and melting furnace is made uniform. According to the temperature distribution and the pressure distribution of the exhaust gas, the damper and the exhaust fan are automatically or manually operated to control the flow of the exhaust gas discharged from the gasification and melting furnace for treating waste so as to be uniform. 2. The gasification and melting furnace according to 1. An exhaust gas treatment device comprising a gas combustion chamber, a cooling tower, a bag filter, an exhaust tower, a dambar, and an exhaust fan is provided independently in a plurality of rows for each series as an exhaust gas treatment device generated when treating waste. 3. The gasification and melting furnace according to 1 or 2. The gasification and melting furnace according to any one of claims 1 to 3, wherein a plurality of exhaust gas outlets are provided symmetrically. The gasification melting furnace according to any one of claims 1 to 4, wherein a plurality of exhaust gas treatment devices are provided in the same number as the number of exhaust gas outlets.

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