JPH048796A - Feed of raw material coal to coke oven of chamber oven type - Google Patents

Abstract

PURPOSE:To increase an amount of coal charged to a uniform charged level and to raise bulk density of raw material coal at the upper part to the direction of furnace height by introducing a leveler into the furnace at a point of time when an amount of changed coal reaches a given amount and carrying out leveling while supplying the residual raw material coal to the furnace. CONSTITUTION:At a point of time when an amount of raw material coal supplied from plural raw material charging holes at the top part, arranged in the longitudinal direction of furnace of chamber oven-type coke oven to the furnace reaches a given amount (preferably 80%), a leveler is introduced from the opening part of a pusher side door and the surface layer part is leveled while supplying the residual raw material coal to the furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for charging coking coal into a room furnace type coke oven.

<Conventional technology> In general, in a room furnace type coke oven, in order to make the charging level uniform when charging raw materials, the operator of the coal loading car adjusts the table so that the raw material is discharged from each table feeder at the same rate. Controls feeder discharge timing and discharge speed.

In this case, as in JP-A No. 58-25382, the discharge speed from each table feeder is detected by a charged coal weighing device, and the rotation speed of the table feeder is controlled so that the deviation of the discharge speeds is the same. method is known.

However, in such a method, it is necessary to newly install a charged coal amount deviation comparator and a charged coal flow rate change detector, and there is a problem that a large amount of equipment investment is required.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 01-268787, a technique has been proposed in which the charged coal is uniformly distributed in the carbonization chamber by using compressed gas blowing and exhaust of furnace gas.

However, changing the falling direction of the charged coal requires blowing and exhausting a considerable amount of gas, causing a large drop in temperature in the coking chamber, deteriorating operational efficiency, and causing difficulties in controlling the falling direction. It's obvious.

<Problem to be solved by the invention> The present invention does not require the installation of new equipment (i.e., it is possible to increase the amount of coal charged per kiln, equalize the charging level, and increase the The purpose of this invention is to provide a technique for achieving an increase in bulk density in the upper part in the high direction.

Means for Solving the Problems> The present invention provides a method for introducing the surface layer of coking coal, which is charged into the furnace through a plurality of raw material charging holes arranged in the furnace length direction in the furnace length direction, into the furnace through the furnace lid opening. An indoor furnace characterized in that when the leveler is used to level the coal, the leveler is introduced into the furnace when the amount of charged coal reaches a predetermined amount, and then the leveling is performed while charging the remaining coking coal. This is a method for charging coking coal into a coke oven, and preferably, when charging coking coal into the furnace through a plurality of coking coal charging holes arranged in the furnace length direction of a chamber furnace coke oven, both ends of the furnace are charged. This is a coking coal charging method in which the raw material charging speed from the raw material charging hole in the central part of the furnace is faster than the raw material charging speed from the raw material charging hole in the central part of the furnace. When charging coking coal into the furnace through multiple coking coal charging holes at the top of the furnace arranged in the furnace length direction, a leveler is introduced into the furnace and leveling is performed when 80% or more of the total amount of charged coal is completed. This is a method of charging coking coal into a chamber-type coke oven.

The present inventors manufactured a 1/10 acrylic model of a coke oven carbonization chamber having four charging holes at the top of the furnace, and determined the charging amount, charging level, and We investigated how the bulk density changes in the furnace height direction. The usual charging method is to charge all the tanks at the same time from each charging hole at the same speed, and after charging is completed, a leveler is inserted from the small lid on the coke oven man side side with a stroke of the same length as the furnace length. It is something that can be passed through.

In contrast, the preferred charging method obtained from the results of model experiments is to start charging all tanks at the same time, temporarily stop all table feeders before the charging of the entire amount of coal is completed, and use the remaining coking coal. This is a charging method in which, at the same time, leveling is performed with an appropriate stroke, preferably the same stroke as between the charging holes.

An even more preferable method is to set the material charging speed from the charging holes at both ends of the coke oven, of the plurality of charging holes at the top of the furnace arranged in the furnace length direction, to be higher than the material charging speed at the center of the furnace. It's about making it faster.

A more preferable charging method is to introduce a leveler into the furnace for leveling when charging of 080% or more of the total amount of coal is completed.

According to the conventional charging method, the charged coal charged into the carbonization chamber has a shape with peaks of approximately the same level as shown in Fig. 1(b), and the coal is charged into the carbonization chamber. A smooth surface is obtained by final smoothing, but the valleys tend to be insufficiently depressed, resulting in recesses as shown in A to E in the figure.

Furthermore, when a large amount of carbonization material is charged and then leveled to obtain a smooth surface, a large amount of material is scraped out of the carbonization chamber by the leveler.

In the present invention, before the charging of the entire amount of coal is completed, for example, at a stage of 70% of the charging level of the charging coal, a leveler is inserted into the furnace and the coal is charged while leveling. A more even distribution within the carbonization chamber can be achieved.

In addition, the amount of coal scraped out of the carbonization chamber by the leveler decreases accordingly.

Note that leveling is continued until the charging of the remaining coal is completed, but when the leveler reciprocates, the notch is preferably at least 1/2 of the distance between the charging holes or about the distance between the charging holes. 1/
If the pitch is less than 2, it is insufficient to fill the valleys with loaded coal formed between charging holes, and even if the pitch is made larger than the distance between charging holes, there is almost no difference in smoothing.

In addition, Fig. 1 (a) shows a carbonization chamber that has four raw material charging holes at the top of the furnace in the furnace length direction. This is an example of speeding up the above. In this case, the coking coal below the charging holes at both ends, which is charged quickly, flows into the center, and as a result, the height of the stack of loaded coal on the back side a and the side where the leveler is inserted is lower than that in the center. Therefore, it is easy to understand that the amount of coal scraped out of the carbonization chamber during leveling is further reduced.

Next, FIG. 2 shows the relationship between the timing of the start of leveling and the amount of coal charged in a 1/10 coking chamber model experiment. According to this, the amount of charged coal increases the most when leveling is performed when 80% of the amount of charged coal is completed. This is because charging can be done while flattening the mountain under the charging hole with a leveler. However, if leveling is started faster than 80%, the number of times the leveler can be charged is limited to three times due to equipment constraints (if it is performed more than three times, the leveler will be deformed by the heat in the coke oven), resulting in hole clogging. There is a fear.

Regarding the leveler stroke, as shown in Figure 2, a stroke of 400nwn that matches the length between the charging holes is 1
The charging amount is larger than 600mm.

The method of the present invention will be explained in more detail based on Examples as well as Comparative Examples.

<Example> Comparative Example 1 The carbonization chamber has a height of 6800 sun, a width of 420 III11,
For items with internal dimensions of 1600mm in depth, the coal is charged from a coal charging truck through 7L and 47L, so that the return is even.
After charging of 0.4 t was completed, a leveler was inserted into the furnace through the leveler hole in the lid of the carbonization chamber, and the surface was leveled. At this time, 200 kg of return coal was generated, and the amount of coal deposited was 30.2 tons.

Example 1 For a carbonization chamber of the same size as the comparative example, the charging of the coal charging car was set at 30.4 t, and when the charging amount reached 80%, the charging was stopped. After putting the leveler into the furnace, recharging began. During recharging, the charging was completed while reciprocating the leveler with a stroke corresponding to 400 pinches of the charging hole. At this time, 50 kg of returned coal was generated, and the leveler reciprocated three times during recharging. The amount of coal charged will be 30.35 tons.

Example 2 The carbonization chamber had the same dimensions as above, and the charging amount was set at 30.4 tons, but the charging distribution among the 4 holes was changed to 2 holes in the center and 1 hole at both ends, and the charging was made in the 2 holes in the center. Charging was started with both ends set at 80% of the speed. When the total charging amount reached 80%, recharging was carried out while reciprocating the leveler with the same stroke as in Example 1. In this example, no return coal was generated and the charging was completed. The entire charge amount was able to be charged.

Figures 3 [a] and (b) illustrate the above results.
(Al shows the difference in the amount of charged coal due to the difference in the charging method. Also, ■) shows the difference in the bulk density of the charged coal due to the difference in the charging method. It can be seen from the comparative example, which is a conventional method, that in Example 2, an increase of 10 kg/rrf was achieved.

Further, FIG. 4 is a diagram showing variations in charging level due to differences in charging methods. Compared to the comparative example, the method of the present invention clearly reduces the variation in charging level.

<Effects of the Invention> According to the present invention, by simply changing the existing leveler sequence without adding any special equipment, the amount of coal charged per kiln can be increased, the charging level can be made uniform, and the upper part of the furnace in the height direction can be increased. It has become possible to achieve bulk density amplifiers, and it has become possible to further improve the economic efficiency of coke oven operation.

[Brief explanation of drawings]

Figure 1 (a) is an explanatory diagram of the method of the present invention, (b) is an explanatory diagram of the conventional example, Figure 2 is a graph showing the results of a coal charging experiment using a 1/10 carbonization chamber model, and Figure 3 (a) is a graph showing the difference in charging coal ■ carried out in an actual furnace, (b) is a graph showing the difference in apparent bulk density, and Figure 4 is a graph showing the difference in charging method carried out in an actual furnace. 2 is a graph showing variations in charging level due to

Claims (1)

[Scope of Claims] 1. The surface layer of coking coal charged into the furnace through a plurality of raw material charging holes arranged in the furnace length direction in the furnace length direction of a chamber furnace type coke oven is flattened by a leveler introduced from the furnace lid opening. In this method, a leveler is introduced into the furnace when the amount of charged coal reaches a predetermined amount, and then leveling is performed while charging the remaining coking coal. Coking coal charging method. 2. When charging coking coal into the furnace through multiple coking coal charging holes at the top of the furnace that are lined up in the length direction of the furnace, the raw material charging speed from the raw material charging holes at both ends of the furnace is 2. The method of charging coking coal into a room furnace type coke oven according to claim 1, wherein the charging speed of the raw material is made faster than the raw material charging speed from the raw material charging hole on the central side. 3. When charging coking coal into the furnace from the multiple coking coal charging holes at the top of the furnace that are lined up in the oven length direction of a room furnace type coke oven, turn on the leveler when 80% or more of the total amount of charged coal is completed. Claim 1 or 2 characterized in that it is introduced into a furnace and leveled.
The coking coal charging method for the chamber-type coke oven described above.