JPH078985B2 - Method of charging raw material into coke oven - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for charging a raw material into a coke oven, which can improve non-uniform carbonization in the oven during the production of coke in a chamber coke oven. is there.

(Prior art and its problems) As is well known in the chamber furnace coke manufacturing method, as shown in FIG. 6, coking coal (hereinafter referred to as “raw material”) is usually supplied from 4 to 5 charging ports 1 through a car. (Abbreviated) 2 is dropped into the carbonization chamber 3 from above the furnace and heated from the combustion chambers on both sides of the carbonization chamber 3 through brick walls to produce coke. The coke produced by this method is carbonized. It is known that there are large quality deviations and carbonization temperature deviations in the three directions of the furnace length, furnace height and furnace width of the chamber 3.

Along with the recent importance placed on improving the efficiency of carbonization of a coke oven and stabilizing the quality of coke, improvement of the quality of the coke oven and the deviation of the temperature of carbonization have become major issues.

One of the causes of these deviations is that the raw material charged into the furnace has an extremely large bulk density deviation in the furnace length and furnace height directions. That is, generally speaking, the deviation in the furnace height direction is lower in the bulk density in the upper part of the furnace than in the lower part of the furnace, and in the furnace length direction, the bulk density between the charging ports and in the kiln port is lower than that just below the charging port. Is low. In the present inventors' investigation as an example, it has been confirmed to have about ± 50 kg / m ³ things large deviations in the case of the average number density 735kg / m ^3. The deviation of the bulk density of the charging raw material in the furnace naturally causes not only the coke quality but also the carbonization temperature deviation, which not only hinders the stabilization of the coke quality but also causes the reduction of the carbonization efficiency. become. Therefore, the development of a technique for uniformly charging the charging raw material into the furnace has become an extremely important issue.

Against this background, some methods have recently been proposed and disclosed for improving the bulk density deviation of the charging raw material. For example, as a method of improving the bulk density of the charging material in the upper part of the furnace,
JP-B-59-18434, 59-18435, 59-18
Japanese Patent No. 437 is disclosed. The inventions disclosed in these publications are methods for improving the upper bulk density of the charged raw material by pressing and consolidating the upper surface of the raw material charged in the furnace using a leveler equipped with a vibrating mechanism. . However, with these methods, there is a concern that the brick wall of the furnace wall may be broken or damaged due to vibration, and it is doubtful whether the technique can be used continuously for a long time.
Furthermore, the effect of improving the bulk density by vibration is limited to the upper part of 1 to 2 m, which is not sufficient to completely improve the deviation of the bulk density in the furnace.

Further, since the bulk density and the bulk density deviation can be improved by charging the charging raw material at a high speed, an opposing belt is installed between the coal charging vehicle and the charging inlet to accelerate the charging raw material. A method for achieving high-speed charging by means of, for example, JP-A-59-122582
It is proposed and disclosed in Japanese Patent Publication No.

Although the method disclosed in Japanese Patent Application Laid-Open No. 59-122582 is considered to be an effective means for high-speed charging, it not only requires a significant improvement of the coal car but also carries air due to the air entrained by the opposing belt. It is presumed that there are many problems that need to be solved in practice, as this may lead to an increase in overload.

As described above, at present, it cannot be said that the known method for improving the bulk density deviation is practically sufficient.

Based on such a background, the present inventors investigated the behavior of the raw material during charging in the carbonization chamber using an acrylic model in order to clarify where the problem is in the conventional method for charging the raw material into the coke oven. did. As a result, as shown in FIG. 6, when the raw material 2 begins to be charged into the carbonization chamber 3, the residual gas (air) in the carbonization chamber 3 is removed by the charged raw material 2 and is shown by a dashed arrow in FIG. As a result, it was confirmed that the flow became an upward flow and flowed toward the charging port 1 and the rising pipe 4 contrary to the flow of the charging raw material 2. As a matter of course, this removed gas is accompanied by a fine powder raw material (dust), so in a coke oven in an actual operation, suction treatment is performed during charging of the gas in the carbonization chamber from the riser and each inlet as a dust countermeasure. ing.

What is important here is that if the gas in the carbonization chamber is suctioned at the charging port, as can be understood from the schematic diagram around the charging port 1 of the actual coke oven shown in FIG. It was pointed out that the gas rising from the inside of the carbonization chamber 3 receives buoyancy and reduces the charging speed, resulting in a decrease in the charging bulk density and an increase in the bulk density deviation.

In FIG. 7, 5 is a coal feeding hopper, 6 is a table feeder, 7 is an auxiliary hopper, 8 is a coal feeding inner cylinder, 9 is a moving fleece, and 10 is a dust collecting hood.

The present invention has been made in view of such problems, and in order to improve the non-uniform carbonization in the coke oven, eliminate the bulk density deviation of the charging raw material in the carbonization chamber is one cause of the non-uniform carbonization The present invention provides a method for charging a raw material into a coke oven.

(Means for Solving Problems) The present invention relates to a method for charging a raw material into a chamber furnace type coke oven, in addition to a plurality of inlets provided in the coke oven, between these inlets and a kiln side. A method for charging a raw material into a coke oven, in which an appropriate opening is installed on the furnace, and the gas in the furnace and dust accompanying it are sucked through the opening when charging the raw material from the charging port. is there.

That is, the present invention is a method for achieving high-speed charging effective in improving the charging bulk density and improving the bulk density deviation, and based on the findings obtained by the inventors of the present invention through experiments, by charging raw materials. It was invented as a method for removing the influence of buoyancy exerted on the charging raw material by the gas in the carbonization chamber to be eliminated.

(Example) Hereinafter, the method of the present invention will be described based on an example shown in FIGS. 1 and 2. In FIGS. 1 and 2, the same reference numerals as those in FIGS. 6 and 7 indicate the same or corresponding parts, and detailed description thereof will be omitted.

FIG. 1 is a schematic view showing the present invention, but as will be understood by comparing with FIG. 1 described above, the method of the present invention replaces the conventional dust collection at the loading inlet 1 with the loading inlet 1 and the loading inlet. The dust is collected from the opening 11 on the furnace provided between the opening 1 and the opening 1 on the kiln.

Therefore, the gas removed by charging the raw material is sucked out of the furnace without disturbing the flow of the charged raw material.
It is possible to improve the charging speed of the raw material 2. Second
The figure shows a schematic diagram around the charging port of an actual coke oven when the method of the present invention is applied. Compared with FIG. 7 of the conventional method described above, during the charging of raw materials in the method of the present invention, The difference in dust collection method will be well understood.

Furthermore, in the conventional raw material charging method, as described above, when the gas in the carbonization chamber 3 removed by the raw material charging flows out of the furnace through the charging port 1, the charging port 1 is narrowed. Because of this, the gas in the furnace that flows counter to the charged raw material has a high flow velocity and entrains a part of the raw material 2 being charged and goes out of the furnace. Therefore, the amount of dust generated is large, but the method of the present invention has an effect that the amount of dust is significantly reduced because the gas flow in the furnace does not pass through the charging port 1.

Next, description will be given based on the results of carrying out the method of the present invention.

A coke oven with a height of 7.125 m, a furnace width of 467 mm, and a length of 16.5 m was used to manufacture a steel model furnace with half the length of the actual furnace and designed at the end of the furnace group of the actual furnace. Then, a raw material insertion experiment was conducted to confirm the effect of the method of the present invention. The outline of the steel model furnace is as shown in Fig. 3, and in order to measure the altitude of the charged raw material, the sampling hole 13 was opened from the bottom of the furnace at 0.75, 1.5,
There are 6 points at 3, 4, 5 and 6 m, and 2 points directly below the two inlets 1 in the furnace length direction, up to the inlet 1 and the kiln, and 2 points between the inlet 1 and the inlet 1. 36 holes were installed. Also,
In the model furnace, in addition to the two normal charging ports, openings 11 and 12 were provided between the charging port 1 and the charging port 1 and on the furnace side of the kiln, and the charging of raw materials was carried out by a normal coal car. .

The experiment was carried out by using normally operated blended coal (raw material particle size of 3 mm or less, 83% by weight, total water content of 9.2% by weight), in addition to the dust collection at the charging port 1 according to the method of the present invention, the openings 11 and 12 provided on the furnace. The raw materials were charged while collecting more dust. For comparison, the openings 11 and 12 on the furnace were closed, and the raw material was charged while collecting dust from the charging port 1 as in the conventional method.

The raw material in a predetermined volume was drill-sampled from each sampling hole 13 for each experiment, and the bulk density was calculated after the weight measurement.
Further, gas sampling was performed from the dust collection duct during charging of the raw materials, and the amount of dust in the gas was measured.

This result shows that, as shown in FIG. 4, the bulk density in the furnace length direction at the position 1.5 m from the bottom of the furnace is higher in the method of the present invention (○) than in the conventional method (●), and It will be understood that the difference in bulk density between directly below the inlet and the kiln or charging port is also a small and effective method of the present invention. Further, as shown in FIG. 5, the bulk density in the furnace height direction just below the charging port is higher in the method of the present invention (marked with ○) than in the conventional method (marked with ●), and the deviation of the bulk density is also small in the method of the present invention. It will be understood. Shows the point of these results in the following Table, the present method reduces to about 15 kg / m ³ at about 25 kg / m ³ increase the number density than conventional methods bulk density deviation is achieved, and particle emissions amount about It is clear that this is an extremely effective method, such as reducing it to 40%.

(Effects of the Invention) As described above, the present description method is a method for charging a raw material into a chamber furnace type coke oven, in addition to the plurality of inlets provided in the coke oven, between these inlets and the kiln port. An appropriate opening is installed on the side furnace, and the charging of the raw material from the charging inlet is particularly performed by suctioning the gas in the furnace and dust accompanying it from the opening, so the charging speed of the raw material is improved. As a result, it is possible to improve the charging bulk density and the charging bulk density deviation.
Further, according to the method of the present invention, the amount of dust that accompanies the residual air flowing out can be greatly reduced. These effects are not only effective for improving the stability of the coke quality and uniform dry distillation, but also improve the dust collection efficiency.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of the method of the present invention, FIG. 2 is a schematic diagram around a charging port of an actual operating coke oven when the method of the present invention is applied, and FIG. 3 is an explanatory view of experimental equipment of the method of the present invention, FIG. 4 is a diagram showing an experimental result of the bulk density of the charging raw material in each part of the carbonization chamber, FIG. 5 is an experimental result diagram of the bulk density due to a change in height from the furnace bottom, and FIGS. 6 and 7 are FIG. 3 is a view similar to FIGS. 1 and 2 of a conventional method. 1 is a charging port, 2 is a raw material, 3 is a carbonization chamber, and 11 and 12 are openings.

Claims (1)

[Claims] 1. A method for charging a raw material into a chamber furnace type coke oven, wherein in addition to a plurality of inlets provided in the coke oven, appropriate openings are provided between these inlets and on the kiln side furnace. A method for charging a raw material into a coke oven, wherein a gas in the furnace and dust accompanying it are sucked from the opening when charging the raw material from the charging port.