JP3817086B2 - Waste layer high level measuring device in waste melting furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for measuring the level of waste in a waste melting furnace for measuring the level of waste in a furnace in a waste melting furnace for melting waste by microwaves.
[0002]
[Prior art]
Waste includes municipal waste, which is general waste, various industrial waste, intermediate treatment products obtained by drying, incineration, crushing treatment, etc., incineration ash, and earth and sand that has been dug up again after landfill treatment. There are landfill waste or sludge containing waste, and as a treatment method for waste such as general waste and various industrial waste, waste is dried and preheated, pyrolyzed in a shaft furnace type pyrolysis melting furnace, There is a waste melting treatment method that burns and melts and takes out as slag and metal. In the waste melting process, the height of waste in the furnace is measured, the height of the waste in the furnace is grasped, and the melting furnace is operated according to the height of the waste.
[0003]
As a means for measuring the surface height of the waste in the furnace, as shown in FIG. 3, a mechanical winch drum 11 is provided on the shaft furnace type pyrolysis melting furnace 1, and a wire 13 having a weight 12 attached to the tip is provided. The winch drum 11 is lowered into the furnace, and a change in the driving force of the winch generated when the weight 12 at the tip of the wire 13 is placed on the upper surface of the waste in the furnace is detected and the winch drum 11 is stopped. A method of calculating a descending distance from a tachometer of a motor attached to the drive device of the winch drum 11 is widely used. In this method, continuous measurement cannot be performed, and the weight 12 is lowered into the high-temperature gas in the furnace. Therefore, the wire 13 is broken or the weight 12 is dropped, and measurement becomes impossible, resulting in an operation trouble.
[0004]
Therefore, for example, Japanese Patent Application Laid-Open No. 9-89632 describes a layer height level measuring device that measures the layer height level of waste by a reflected wave of a microwave transmitted from a microwave transmitting / receiving device.
[0005]
[Problems to be solved by the invention]
Conventionally, measuring the layer height level of the filling in the container using microwaves has been put into practical use in a wide range of industrial fields. However, the measuring device equipped with only the microwave transmitter / receiver has no protection means against the hot gas, so the measuring device is damaged by the influence of the heat of the hot gas rising in the furnace, or in the hot gas. There is a disadvantage that microwaves are attenuated due to adhesion of dust, oil and water contained in the water and accurate measurement cannot be performed.
[0006]
The present invention reduces the height of the waste surface by microwaves, which is not affected by the heat of the hot gas rising in the waste melting furnace, and prevents adhesion of dust, oil and moisture contained in the hot gas. The present invention provides a layer high level measuring device including a microwave transmitting / receiving device for measurement.
[0007]
[Means for Solving the Problems]
The waste layer high-level measuring device in the waste melting furnace of the present invention is a waste material reflected by a microwave reflected wave on the upper part of the cylindrical body of the layer high-level measuring device fixed to the opening of the waste melting furnace. A microwave transmitter / receiver for measuring the layer height level of the cylinder is provided, and a porous ceramic plate for partitioning the cylindrical body is provided at a lower portion of the cylindrical body, and the cylinder is partitioned by the microwave transmitter / receiver and the porous ceramic plate A pressure gauge that displays the pressure in the cylindrical body is installed in the cylindrical body, and a purge gas pipe that blows an inert gas into the cylindrical body so that the pressure in the cylindrical body becomes higher than the pressure in the furnace, and a porous ceramic A shut-off valve for shutting off the inside of the furnace is provided between the plate and the opening in the upper part of the waste melting furnace .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a view showing a state in which a waste layer high level measuring apparatus according to the present invention is installed in a waste melting furnace, and a layer high level provided with a microwave transmitting / receiving device 3 in the upper part of a shaft furnace type pyrolysis melting furnace 1. A measuring device 2 is installed. The layer height level measuring device 2 is disconnected from the melting furnace 1 by a porous ceramic plate 4. The microwave 5 transmitted from the microwave transmitting / receiving device 3 is reflected by the surface of the waste, the reflected wave 6 is received by the microwave transmitting / receiving device 3, and the layer height level of the waste is measured by the arithmetic processing device.
[0010]
FIG. 2 is a cross-sectional view of a layer height level measuring device according to the present invention. In the upper portion of the cylindrical body 8 of the layer height level measuring device 2 fixed to the opening 7 in the shaft upper portion of the shaft furnace type pyrolysis melting furnace 1. The microwave transmitter / receiver 3 is provided, and the microwave 5 and the reflected wave 6 pass through the cylindrical body 8 and are transmitted / received by the microwave transmitter / receiver 3. A porous ceramic plate 4 that partitions the tubular body 8 is provided at the lower portion of the tubular body 8. The cylindrical body 8 partitioned by the upper microwave transmitting / receiving device 3 and the lower porous ceramic plate 4 is provided with a purge gas pipe 9 for blowing an inert gas such as nitrogen gas or argon gas into the cylindrical body 8. In addition, a pressure gauge PI for displaying the pressure in the cylindrical body 8 is provided. The pressure in the cylindrical body 8 is blown so as to be higher than the furnace pressure.
[0011]
A shutoff valve 10 for shutting off the inside of the furnace is provided between the bed height measuring device 2 and the opening 7 of the melting furnace 1. When the bed level measuring device 2 is removed from the opening 7 for maintenance or the like, the shutoff valve 10 is closed in advance in order to prevent the hot gas in the furnace from blowing out.
[0012]
Since the porous ceramic plate 4 is porous, attenuation of the microwave 5 can be suppressed. By providing the porous ceramic plate 4, the heat of the high temperature gas from the inside of the furnace can be shut off, and the inert gas blown into the cylindrical body from the purge gas pipe 9 is porous to the porous ceramic plate 4. Since it passes through the mass part and flows to the inside of the furnace, it is possible to prevent oil and moisture from adhering to the outer surface of the porous ceramic plate 4.
[0013]
【The invention's effect】
The present invention can block the heat of the high temperature gas from the inside of the furnace, can prevent oil and moisture from adhering to the outer surface of the porous ceramic plate 4, eliminates any measurement trouble, and is discarded in the furnace. Since the layer height level of the object can be grasped stably and continuously accurately, stable operation can be performed by performing the operation according to the situation in the furnace.
[Brief description of the drawings]
FIG. 1 is a view showing a state in which a waste layer height level measuring apparatus according to the present invention is installed in a waste melting furnace.
FIG. 2 is a cross-sectional view of a layer height level measuring apparatus according to the present invention.
FIG. 3 is a view showing a conventional layer height level measuring apparatus using a weight.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft furnace type pyrolysis melting furnace 2 Layer high level measuring apparatus 3 Microwave transmission / reception apparatus 4 Porous ceramic board 5 Microwave 6 Reflected wave 7 Opening part 8 Tubular body 9 Purge gas piping 10 Shut-off valve 11 Mechanical winch drum 12 Weight 13 wires

Claims (1)

A microwave transmitting / receiving device for measuring the layer height level of the waste by the reflected wave of the microwave is provided on the upper portion of the cylindrical body of the layer high level measuring device fixed to the opening of the upper part of the waste melting furnace, and the cylindrical body A porous ceramic plate for partitioning the cylindrical body is provided at the bottom of the tube , and a pressure gauge for displaying the pressure in the cylindrical body is installed on the cylindrical body partitioned by the microwave transmitting / receiving device and the porous ceramic plate , A purge gas pipe for injecting an inert gas into the cylindrical body is set so that the pressure in the cylindrical body becomes higher than the pressure in the furnace, and between the porous ceramic plate and the opening at the top of the waste melting furnace, An apparatus for measuring a high level of a waste layer in a waste melting furnace, wherein a shut-off valve for shutting off is provided .

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