JPH0436385A - Charging of coal into coke oven - Google Patents

Abstract

PURPOSE:To prevent leakage of dusts and gases and deterioration of tar quality by regulating the coal charging speed with reference to the inner pressure of a carbonization chamber of a coke oven and thereby controlling the inner pressure of the carbonization chamber. CONSTITUTION:The coal in hopper 2 is cut out by rotating a table feeder 5 and charged from a charging hole 11 into a carbonization chamber 12. The charging speed is controlled by changing the rotation speed of a motor 6. Pressure change in each chamber 12 is continuously checked, and coal charging speed is altered in accordance with its deviation from the standard pressure previously input into a standard pressure presetter 9. The rotation speed of the motor 6 is changed based on a calculation given by a controlling sequencer 8. In charging coal, the inner pressure of the oven is continuously measured. When it is higher than the preset standard pressure, the coal charging speed is decreased. When it is lower than the preset one, the charging speed is enhanced. Thus, the inner pressure of the oven can be kept in the capacity of a dust-collecting apparatus, so that the leakage of dusts and gases can be prevented and carry-over of coal into tar can be suppressed.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a method for charging coal into a coke oven.

BACKGROUND ART In the coke oven 10, generally, as shown in FIG. A method is used in which the material is charged into the carbonization chamber 12 by falling by gravity through four or five charging ports 11 (four in FIG. 46).

Further, dust and gas generated during coal charging are collected by the charging car dust collector 3, and are also sucked into the riser by the ejector effect of the high-pressure ammonium water 4a at the riser pipe bend portion 4.

However, at the beginning of coal charging, the falling distance of the coal is long and the final velocity is fast, and at the end of charging, the amount of gas generated increases. Due to these effects, the carbonization chamber 12 as shown in FIG.
The internal pressure (hereinafter referred to as furnace internal pressure) fluctuates significantly, and it has been difficult to prevent dust and gas from leaking out of the furnace using only the above dust collection method.

<Problem to be solved by the invention> Japanese Patent Publication No. 60-6387 describes a method for preventing the leakage of dust and gas to the outside of the furnace during coal charging and the intrusion of air into the furnace due to an excessive drop in the internal pressure of the furnace. Proposed. This method adjusts the ejector effect at the bend of the riser pipe to maintain an appropriate pressure inside the furnace at all times, and by this method it is possible to suppress the leakage of dust, gas, etc. to the outside of the furnace. However, since this method increases the suction force of the riser when the furnace pressure rises, coal carryover increases when the moisture content of raw coal decreases, causing coal to get mixed into the tar and significantly deteriorating the tar quality. There was a problem with becoming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for charging coal into a coke oven that can solve the above problems, prevent leakage of dust, gas, etc., and suppress deterioration of tar quality.

Means for Solving the Problems> The present invention was completed through detailed measurement and analysis of fluctuations in furnace pressure, coal charging speed, etc. when charging coal into a coke oven. As a method of maintaining the furnace internal pressure appropriately during coal charging, the method of maintaining the furnace internal pressure appropriately by adjusting the coal charging speed without relying on the method of adjusting the ejector effect in the riser pipe section, This prevents dust and gas from leaking outside 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 coking chamber of the coke oven is continuously measured, and the speed at which the coal is charged is determined based on this measured value. A method for charging coal into a coke oven is provided, which comprises performing IWJ and controlling the pressure inside the coking chamber.

The present invention will be explained in more detail below.

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

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

6 is a motor for driving the table feeder, and by controlling the rotation speed of the motor 6, the coal charging speed is controlled by IIJ. Further, 7 is a pressure gauge for measuring the pressure inside the furnace, and the pressure change in each carbonization chamber 12 is continuously measured, and the coal charging speed is determined according to the deviation from the reference pressure value preset in the reference pressure setting device 9. A calculation and control sequencer 8 calculates to change the rotation speed of the motor 6.

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

Then, during coal charging, the furnace internal pressure is continuously measured and compared with a predetermined standard pressure. If the pressure is higher than the standard pressure, the coal charging speed is decreased, and if it is lower, the coal charging speed is increased. As a result, the pressure inside the furnace can always be maintained within the range of the dust collection function, which not only prevents dust and gas from leaking out of the furnace, but also suppresses carryover of coal into the tar.

FIG. 2 shows an example of coal charging speed control 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 standard pressure range.

<Example> The present invention will be specifically explained below based on Examples.

(Example 1) Using the control device shown in Fig. 1, the amount of coal charged at one time was 30 tons.
(moisture 8.0%), standard pressure range 5-15mm) 120
Coke was produced at The gas leakage rate and the amount of coal carryover into the tar for 11 consecutive days are shown in Figures 4 and 5 (marked with ○), and both are significantly reduced compared to the values obtained using the conventional method (marked with *). It was done.

<Effects of the Invention> Since the present invention is configured as described above, it is a method of measuring the furnace internal pressure when charging coal and adjusting the coal charging speed based on the result. Regardless of differences in the furnace internal pressure level, the furnace internal pressure can always be controlled at an appropriate level, and not only can it prevent dust, gas, etc. from leaking out of the furnace, but it also reduces tar buildup due to coal carryover compared to other methods. The deterioration in product purchases can also be suppressed.

[Brief explanation of drawings]

FIG. 1 shows one 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 coal charging speed control according to the present invention. FIG. 3 is a graph showing fluctuations in the furnace pressure during the control shown in FIG. 2. FIG. 4 and FIG. 5 are graphs showing changes in the gas leakage rate and the amount of coal carryover into tar in the present invention, respectively. FIG. 6 is an explanatory diagram showing the state of charging coal into a coke oven. FIG. 7 is a graph showing fluctuations in conventional furnace pressure. Description of symbols 1...Charging vehicle, 2...Hopper 3...Charging vehicle dust collector, 4...Rising pipe bend section, 4a-...High pressure ammonium water, 5...Table feeder 6... ...Drive motor 7...Pressure gauge, 8...Calculation, control sequencer 9...Reference pressure setter, 10...Coke oven, 11...Charging port, 12...Carbonization Room FIG, 1 FIG, 2 FIG, 3 During the charging period, do you want to change the weather? (7) FIG FIG, 5 Day #( (Sun)

Claims (1)

[Claims] (1) When charging coal into a coke oven, continuously measure the pressure in the coking chamber of the coke oven, adjust the coal charging speed based on this measured value, and control the pressure in the coking chamber. A method for charging coal into a coke oven, characterized by: