JPS606386B2 - How to charge coal in a coke oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When charging preheated coal or dry coal to a room furnace type coke oven, the present invention prevents powdered coal from being introduced into the gas pipe along with the generated gas (hereinafter referred to as carryover). The purpose is to reduce

In a normal coke oven, coal with a moisture content of about 7% to 10% is charged, but recently, before charging into a coal coke oven,
Reduce the pre-dried moisture, or even reduce the moisture to 0,
A method of heating the raw material and then charging it into a coke oven is being adopted. Here, coal that has been predried to have a moisture content of 5% or less is called dry coal, and coal that has been heated to a temperature of 10,000 to 300 qo after the moisture has been evaporated is called preheated coal. When charging child thermal coal or dry coal to a coke oven, there is a possibility that a large amount of carryover will occur, which will mix with the tar and cause an increase in tar moisture and sludge content, significantly deteriorating the tar quality. well known.

The present invention was made based on the fact that the amount of carryover generated is not constant during the coal charging time, but changes significantly as the charging progresses.

That is, the coal charging speed is changed during the charging process in order to reduce the amount of carryover that occurs. FIG. 1 shows an example of a change in the amount of carryover generated during charging time when preheated coal is charged. As is clear from the figure, a large amount of carryover occurs at the beginning of charging and at the end of charging, and the amount generated in the middle is relatively small. At the beginning of charging, the distance that the coal falls to the bottom of the coking chamber is long and the impact force is large, so powdered coal flies up and the carryover is large.On the other hand, at the end of charging, the amount of gas generated increases. Furthermore, the height of the coal bed increases, and the flow rate of gas passing through the upper part of the coking chamber increases, making it easier for powdered coal to be entrained in the gas. Conventionally, the coal charging speed was kept constant regardless of the change in the amount of carryover generated during the charging time, which resulted in an unnecessarily increased carryover. In view of the above facts, the present invention
This is an attempt to reduce carryover by changing the charging speed of coal into a coke oven so that it increases when the amount of carryover occurs is low and decreases when the amount of carryover is high.
In other words, a coal bagging speed pattern is created in advance that matches temporal changes in the amount of carryover that occurs during charging due to coal properties, specifically moisture content and co-heat temperature, as well as grain size and brand. Coal is charged into the coke oven according to the following. FIG. 2 shows an example of the pattern. Dotted line A shows the conventional method, in which charging is carried out at a constant rate of 8 TON/min for a charging time of 4 minutes. The solid line B shows an example of the present invention, and the distance between the two current sands after charging is MON.
/min, 6TON/min for the next 4 feeding seconds, lOTON/min every 40 seconds for the next 2 minutes, 1 TON/min, 8TON/min.
minute, and the last minute is a charging pattern at a rate of 4 TON/minute. As a result, the charging speed was set high between the time period between the start of charging and the end of charging, where the charging speed was low and there was little carryover, so it was possible to significantly reduce carryover. In other words, in the conventional method, the carry over of 12k9/T-coal was reduced to 5.6kg/T with the above charging speed pattern.
-Decreased to coal. The pattern according to the present invention does not need to be limited to the stepwise variation described above, and may be changed in a curved manner. An example of coal charging is shown in Figure 3 below.
This will be explained with reference to FIG.

Figure 3 A shows the method of charging coal at the mouth using a chain conveyor, Figure 4 A shows the method of charging coal at the mouth using a hopper car, and Figure 5 A shows the method of charging coal at the mouth using a pipe. Figure A shows the front view, and the mouth shows the side view. First, the case shown in FIG. 3 will be explained.

Coal is stored in a coal tank and introduced into a chain conveyor 3 via a valve 4. The valve 4 is usually a rotary valve. There is a chute wheel 6 on the top of the coke oven 1, and when bagging coal into the coking chamber 2, the chute wheel 6 is moved to that position, and the lid 8 of the chain conveyor 3 and the charging lid of the coke oven are placed in a bag. Open 7 and use chute 9 to reach chain conveyor 3
and the carbonization chamber 2. As a result, coal is charged into the carbonization chamber 2 from the chain conveyor 3. chain conveyor 3
The transport capacity of valve 4 is made larger than that of valve 4. Therefore, the rate of coal discharge from valve 4 determines the rate of coal charging into the coke oven. In the present invention, the rotational speed of the valve 4 is changed according to the pattern described above. In the case of FIG. 4, the hopper car 12 receives coal from the coal tank 5 into the hopper 101,
Move to carbonization chamber 2.

Then, the hopper car 12 opens the charging lid 7 and charges coal into the carbonization chamber 2 through the valve 11. In the present invention, a rotary valve or a table feeder is used as the valve 11. Therefore, the rotation speed is changed according to the pattern described above. In the case of FIG. 5, coal is introduced into the pipe 13 from the coal tank 5 through the valve 15. The valve 15 is usually a rotary valve.The coal entering the pipe 13 is filled with an inert gas 1.
7, and enters the carbonization chamber 2 through a valve 16 and a duct 14. In the present invention, the rotational speed of the valve 15 is changed according to the pattern described above. As described above, when coal is charged into a coke oven by the method of the present invention, carryover is significantly reduced, and therefore, tar quality can be significantly improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the relationship between charging elapsed time and the amount of carryover occurrence, FIG. 2 is a diagram showing a pattern according to the present invention,
Figure 3 is a diagram explaining how to charge coal with a chain conveyor, A is a front view and the mouth is a side view. Figure 4 is a diagram showing how to charge coal with a hopper car, A is a front view. The mouth is a side view, FIG. 5 is a diagram showing the method of charging coal through a pipe, A is a front view, and the mouth is a side view. Tsutomu/1 Official 2 Junta 31 Nail Elephant Saw Nail Outside Ta-nail

Claims (1)

[Claims] 1. When charging preheated coal or dry coal to a room furnace type coke oven, create a charging speed pattern in advance that matches the time change in the amount of carry over that occurs during charging work,
A method for charging coal in a coke oven, characterized by charging coal according to this charging speed pattern.