JP2880766B2 - Coal charging method for coke oven - Google Patents

Description

The present invention relates to a method for charging coal into a coke oven.

<Conventional Technology> In a coke oven 10, as shown in FIG. 6, as a method for charging coal as a raw material, coal loaded in a hopper 2 of a charging vehicle 1 is generally provided at the top of the coke oven 10. In this method, four or five charging ports 11 (four in FIG. 6) are charged into the carbonization chamber 12 by gravity.

Dust and gas generated at the time of charging coal are collected by the charged vehicle dust collector 3, while being sucked to the riser tube side by the ejector effect of the high-pressure water 4a in the riser tube bend unit 4.

However, in the early stage of charging coal, the falling distance of the coal is long and the final speed is fast, and the amount of generated gas increases in the last stage of charging. Due to these effects, as shown in FIG. 7, the pressure inside the carbonization chamber 12 (hereinafter referred to as furnace pressure) fluctuates greatly, and it is difficult to prevent dust and gas from leaking out of the furnace only by the above dust collection method. Met.

<Problems to be Solved by the Invention> Japanese Patent Publication No. 60-6387 discloses a method for preventing dust and gas from leaking out of the furnace at the time of coal charging and preventing air from entering the furnace due to an excessively low furnace pressure. Proposed. This method adjusts the ejector effect at the riser tube bend section to always maintain an appropriate furnace pressure. By this method, leakage of dust, gas, etc. to the outside of the furnace can be suppressed. However, in this method, the suction force of the riser tube is increased when the furnace pressure rises, so that when the water content of the raw coal decreases, the carryover of the coal increases, and the coal is mixed into the tar and significantly deteriorates the tar quality. There was a problem of becoming.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of charging coal into a coke oven, which solves the above problems, prevents dust and gas from leaking, and can suppress deterioration of tar quality.

<Means for Solving the Problems> The present invention has been completed by measuring and analyzing the fluctuation of the furnace pressure, the charging speed of coal, and the like in detail when charging coal into a coke oven. As a method of maintaining the furnace pressure properly during coal charging, the furnace pressure is maintained properly by adjusting the coal charging speed regardless of the method of adjusting the ejector effect in the riser section. To prevent dust and gas from leaking out of the furnace.

That is, according to the present invention, in order to achieve the above object, when charging coal into a coke oven, the pressure in the carbonization chamber of the coke oven is continuously measured, and the rate at which coal is charged based on the measured value is measured. Is adjusted by comparing a measured value with a predetermined reference pressure, and the pressure in the coking chamber is controlled so as to be within a reference pressure range.

 Hereinafter, the present invention will be described in more detail.

FIG. 1 is a system diagram showing an example of a configuration of a control device for implementing the present invention.

The coal in the hopper 2 is cut out by the rotation of the table feeder 5 and charged into the coking chamber 12 from the charging port 11.

Reference numeral 6 denotes a motor for driving the table feeder, and the charging speed of the coal is controlled by controlling the rotation speed of the motor 6. Reference numeral 7 denotes a pressure gauge for measuring furnace internal pressure, in which pressure changes in each of the coking chambers 12 are continuously measured, and the charging speed of coal is determined according to a deviation from a reference pressure value preset in a reference pressure setting device 9. Is changed by a calculation and control sequencer 8 to change the rotation speed of the motor 6.

The reference pressure value set in the setting unit 9 may be set to an appropriate value in consideration of the structure of the coke oven, the function of collecting dust, the ejector effect, the properties of the raw coal, and the like.

Specifically, as described above, the setting of the reference pressure value is carried out by measuring and analyzing the fluctuation of the furnace internal pressure at the time of charging coal into the coke oven, the charging speed of coal, etc. , Can be set as a value that can prevent gas from leaking out of the furnace.

More specifically, coal is charged into the coke oven in advance under conditions where the structure, dust collection capacity, ejector effect, etc. of the coke oven are the same as during operation, and the furnace is operated by the pressure gauge 7 shown in FIG. The reference pressure value can be set by measuring the fluctuation of the internal pressure and measuring and analyzing the coal charging speed and the like in detail. At this time, the properties of the raw coal are taken into account using a general method, and for example, the relationship between the moisture content of the charged coal and the furnace pressure, or the amount of change in the furnace pressure during the coal charging process, etc. Measured.

Then, the furnace internal pressure is continuously measured at the time of charging coal, and the charging speed of the coal is reduced if the pressure is higher than the reference pressure compared with a predetermined reference pressure, and the charging speed of the coal is increased if the pressure is lower than the reference pressure. In order to control the pressure in the carbonization chamber (furnace pressure) within the reference pressure range, the pressure inside the furnace can always be maintained within the range of the dust collection function, preventing not only dust and gas from leaking out of the furnace, but also coal. Carryover into the tar can be suppressed.

FIG. 2 shows an example of the control of the coal charging speed according to the present invention. As a result, as shown in FIG. 3, the furnace pressure from the start to the completion of coal charging can be maintained within the reference pressure range.

<Example> Hereinafter, the present invention will be specifically described based on examples.

(Example 1) Using the control device shown in Fig. 1, the amount of coal charged at one time is 30t.
(8.0% moisture), it was produced coke in the reference pressure range 5~15mmH ₂ O. The gas leakage rate and the carryover amount of coal into tar for 11 consecutive days were significantly reduced as compared with the values obtained by the conventional method (●), as shown in Fig. 4 and Fig. 5 (○). Was done.

<Effects of the Invention> Since the present invention is configured as described above,
Since the furnace pressure is measured at the time of charging coal and the charging speed is adjusted based on the results, the furnace pressure can always be controlled to an appropriate level regardless of the difference in furnace pressure level between kilns. In addition, it is possible not only to prevent gas and the like from leaking out of the furnace, but also to suppress deterioration of tar quality due to coal carryover as compared with other methods.

[Brief description of the drawings]

FIG. 1 shows a configuration of a control device for implementing the present invention.
It is a system diagram showing an example. FIG. 2 is a graph showing an example of the control of the coal charging speed according to the present invention. FIG. 3 is a graph showing a change in furnace pressure during the control shown in FIG. FIGS. 4 and 5 are graphs showing changes in the gas leakage rate and the amount of carryover of coal into tar in the present invention, respectively. FIG. 6 is an explanatory diagram showing a state of charging coal into a coke oven. FIG. 7 is a graph showing a conventional furnace pressure fluctuation. DESCRIPTION OF SYMBOLS 1 ... loaded car, 2 ... hopper, 3 ... loaded car dust collector, 4 ... riser bend part, 4a ... high pressure water, 5 ... table feeder, 6 ... drive motor, 7 ... pressure gauge, 8 ... Sequencer for calculation and control, 9 ... Reference pressure setting device, 10 ... Coke oven, 11 ... Inlet, 12 ... Coking room

Claims (1)

(57) [Claims] When charging coal into a coke oven, the pressure in the carbonization chamber of the coke oven is continuously measured, and based on the measured value, the reference pressure and the measured value are set to a predetermined rate for charging the coal. A method for charging coal into a coke oven, wherein the method controls the pressure in the coking oven so that the pressure in the coking chamber falls within a reference pressure range.