JPS5829884A - Preparation of metallurgical coke - Google Patents

Abstract

PURPOSE:To efficiently prepare lumped coal with high strength applicable to a large coke oven without using water or any other binders, by subjecting the surface of the lumped coal obtd. by compacting pulverized raw coal to electromagnetic heating. CONSTITUTION:Pulverized raw coal adjusted for preparing coke is charged to a container 1 slightly smaller in dimension than the coking chamber of a coke oven and built of a dielectric material with good transmittance for electromagnetic waves such as a brick or ceramic material and empacted gradually with a pushing rod 2 to obtain lumped coal. The obtd. coal 3 is converted into semicoke by charging it together with the container 1 to a dielectric furnace 4, closing the furnace opening with an openable lid 6, and heating the surface portion of the lumped coal by generating electromagnetic waves from each electromagnetic wave generator 4-1-4-6. It is possible to efficiently prepare lumped coal with good strength applicable to a large coke oven with a height of 6-7m without using water or any other binders.

Description

Detailed Description of the Invention This invention is a room furnace type coke oven in which a large amount of non-slightly caking coal and low-grade coal with low caking property is blended to produce good quality and highly economical metallurgical use. The present invention relates to a method for producing coke.

Methods for producing metallurgical coke using low-grade coal such as non-slightly caking coal as the main blend in a room furnace type coke oven include: ■ Molded coal blending method; ■ Vertical preheating method.

(4) A stamp charging method is known. However, all of these technologies still have problems in terms of expansion of the range of use of non-slightly caking coal and economic efficiency.

In other words, the briquette coal blending method (■) is a method in which high-density briquette coal is blended with the coal blend for coke oven charging and charged into the coke oven. It is widely practiced because it allows for the measurement of

But this method.

Because the molten coal and the normal charged coal must be charged in such a way that they do not segregate, the blended amount of the molten coal must be at a maximum of 401 mm.
It is said that the degree of Further, the bulk density improvement effect of the charged coal in this case is about 1.2 times that of blended coal alone, and the maximum blending amount of non-slightly caking coal is said to be 25 to 30%. Moreover, it requires equipment for molding and production, equipment for preventing segregation during blending of briquette coal, and has the disadvantage of increasing equipment costs.

In addition, the preheating coal method (2) is a method in which a part or all of coking coal, non-caking coal, or steam coal is preheated to 200 to 300°C and charged into a coke oven, and the bulk density of the charged coal is It is expected that coke quality will be improved by improving coke quality.1-1 The productivity of coke ovens will be improved by shortening carbonization time, but 1. As a work environment improvement measure, prevention of dust generation during transportation, storage tank, and charging and spontaneous ignition will be improved. It requires stopping equipment and costs a lot of money. Also.

The blending amount of non-slightly caking coal is also 30-40.

It cannot be said that it is economically efficient.

The stamp charging method (2) is, in principle, a method of improving the bulk density of the raw materials by compacting the blended raw materials, thereby improving the coke quality.

However, this method is extremely difficult to implement;
At present, it has not yet been applied to large coke ovens. The reason for this is the stability of the strength of true coal when the blended raw materials are tamped and agglomerated and charged into a coke oven. That is, in the conventional method, the moisture content of the blended coal is 8 to 10
%, and the surface tension is used to make lump coal.
The limit is to obtain enough agglomerated coal to charge into a small coke oven with a furnace height of about 4 quakes. In addition, the strength of agglomerated coal is not good, so we have no choice but to adopt a method of charging immediately after agglomeration in front of the coke oven, resulting in very complex equipment. It had become a thing.

However, in the stamp charging method.

Since the density of agglomerated coal is high, the blending amount of non-slightly caking coal can be 60 to 7096, and the greatest saving effect on strongly caking coal can be expected among the above-mentioned conventional techniques. Therefore, as a result of conducting various studies on the stamp charging method, the inventors were able to greatly improve the strength of agglomerated coal, which is a drawback of the conventional method, and to use it in large coke ovens with furnace heights of 6 to 7 mm. We have discovered a method for producing lump coal that can be applied to

This invention will be explained in detail below.

In this invention, pulverized raw coal adjusted for coke production is charged into a container slightly smaller than the coking chamber size of a coke oven and compacted sequentially. The method is characterized in that the surface of the agglomerated coal is solidified by irradiation with electromagnetic waves of 20 MHz to 3 Gfiz, and then charged into a coke oven.

That is, in this invention, a semi-coke shell is formed on the surface by irradiating 1[ffi wave] to the consolidated lump coal.

This maintains the strength of the agglomerated coal and handles it until it is charged into a coke oven. Electromagnetic waves were used as a method to solidify the surface of lump coal.
This is because the temperature of the surface portion can be raised to a concentration higher than the concentration at which semi-coking is completed (500 to 600°C) in a very short time. The frequency of the electromagnetic waves in this case is effective in the frequency band of 2QMf (z to 3 GHz), which is usually used in dielectric heating, that is, the frequency band in which the dielectric loss of coal is large. It can be heated to 500 to 600°C in a short time to form semi-coke.

In this invention, as mentioned above, in order to maintain the strength of the lump coal by heating and solidifying the surface of the lump coal using electromagnetic waves, the furnace height is 6 to 7 m without using water or other binders.
This makes it possible to efficiently produce agglomerated coal with good strength that can be applied to large coke ovens. Moreover, the agglomeration does not need to be carried out in front of the coke oven just before charging into the coke oven as in the conventional method, and the agglomerated coal produced by intensive agglomeration in a remote location is placed in the trench in front of the coke oven. Since it becomes possible to adopt a method of carrying out charging and harvesting, the equipment is simpler and more advantageous than the conventional method.

As described above, according to the present invention, the strength of agglomerated coal, which was the biggest drawback of the conventional stamp charging method, can be greatly improved. The stamp charging method can be applied to
Since the strength of agglomerated coal can be maintained without using water or other binders, the stamp charging method can also be applied to dry or preheated coal, reducing the amount of highly coking coal. In addition, it is possible to greatly improve productivity.

Next, an example of an apparatus for carrying out the method of the invention will be explained based on FIGS. 1 and 2.

Figure 1 shows a container and a stick for agglomerating raw coal; (1) is the container and (2) is a stick.

(3) indicates lump coal, and volume II (t) is slightly smaller than the coke oven carbonization chamber size, and is made of cast electric material (e.g., brick, ceramic material) that is transparent to electromagnetic waves. ), the pressing rod (2) is made of steel, and the heavy rod (2) is made of steel.
It is about 0.00 plum size. Figure 2 shows a sieve heating furnace for solidifying the surface part of the agglomerated grains, and the furnace body (4)
is a nine rectangular box with an open top surface, and a mounting table (8) for storing the container (1) is provided inside, and an electromagnetic wave generator (4-1) is mounted on each surface. -(4-5) are attached via waveguides (5-1) to (5-5).

(6) is the opening/closing lid of the furnace mouth, and this lid also emits electromagnetic waves! (4-6) is attached via a waveguide (5-6), and is further provided with a gas vent (7).

When producing agglomerates using the above-mentioned equipment, the first step is to prepare the condensate. ! (
1) While charging fine powdered raw material coal adjusted for coke production, it is sequentially compacted and agglomerated using a rod (2), and the resulting agglomerate (3) is poured into a container # (1). ) After charging the electric heating furnace (1) and closing the furnace opening with the opening/closing lid (6), each electromagnetic wave is emitted! Output electromagnetic waves from IA units (4-1) to (4-6>) 1-1 Heat the surface part of lump coal (3) to make semi-coke, then charge 5 units of coal into a coke oven. to produce metallurgical coke.

Next, embodiments of the invention will be described.

[Example 1] Moisture reduced to 10%! II) The prepared coal blend shown in Table 1 was heated to the height El) 1000ff and width W 43Of shown in Figure 1.
f, length)) While sequentially charging the container (1) with a length of 1000111 m, the steel pressing rod (2) of 200 mm is placed 5 times.
Consolidation is performed by repeating free fall from a height of 00 times,
Height soosw% width 450cm.

An agglomerated coal having a length of 1ooOff was made, and then the agglomerated coal was charged into an electrically-proof heating furnace shown in Figure 2 with a container, and irradiated with 1 lcta waves for about 10 minutes under the electromagnetic wave irradiation conditions shown in Table 2. 1. Semi-coast was formed from the surface to a depth of about 50 g 1 liter. The obtained agglomerated coal has a height of 100Q wx and a width of 450 mm.
n.

The mixture was charged into a large test coke oven having a carbonization chamber with a length of 1 UOOfl, and carbonized at 100°C. The results are also listed in Table 2. In addition,#! For comparison, Table 2 shows the results obtained when agglomerated coal of the same size obtained without irradiation with chamber magnetic waves after consolidation was carbonized in the same coke oven.
! They are also shown together.

As is clear from the results in Table 2, the compressive strength of the agglomerated coal of test Al, 2 according to the present invention is much higher than that of the agglomerated coal of the comparative example obtained without irradiation with electromagnetic waves. As a result of this improvement in the agglomeration longitudinal strength to a large degree, the amount of powder generated during the process up to charging into the coke oven was reduced to 10% compared to the comparative example.
% to nearly θ. In addition, along with the improvement in agglomeration longitudinal strength, coke strength also increased.

Table 1 Table 2 Table Lump coal treatment amount 500V batch [Example 2] A raw material prepared by drying the blended coal shown in Table 1 of Example 1 to a moisture content of 2%, and a raw material preheated to a temperature of 200"C were used, respectively. Agglomerated coal was prepared in the same manner as in Example 1, and the obtained agglomerated coal was carbonized to produce coke under the same conditions as in Example 1. The results are shown in Table 3.

For comparison, agglomeration was carried out using dry charcoal of upper sweetfish and hot water without irradiating chamber magnetic waves after compaction, but this was surprising because there was no water as a condensing agent. It was not possible to obtain lump coal.

From the results in Table 3, it is clear that even with dry coal or preheated coal that does not contain water as a 'w1 mixture, agglomerated coal can be obtained according to the method of the present invention, and the agglomerated coal strength is high. It has been found that lump coal can be obtained with almost no amount of powder generated before being charged into a coke oven. In addition, the apparent specific gravity of the water-free Kume lump coal was improved, resulting in extremely high coke strength and a shortened carbonization time.

Table 3 Lump charcoal hot water amount 500v batch

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a container and a pressing rod used for agglomerating raw material coal in the method of this invention, and Fig. 2 is an example of a round electric heating furnace for solidifying the 11-sided portion of agglomerated coal in the same method. FIG. In the figure, 1... Container, 2... Keyaki for pressing, 3... Lump coal, 4... Furnace body, 4-1 to 4-6... Electromagnetic wave oscillator, 5-1 to 5 -6... Waveguide, 6... Lid, 7-- Gas venting section, 8... Mounting table. Applicant Sumitomo Industries Co., Ltd. Agent 1) Yoshihisa °,,'＋,
Noon 1 Figure 2

Claims (1)

[Claims] Raw coal in the form of nine mold powder adjusted for coke production is sequentially consolidated while charging *aK, which is slightly smaller than the carbonization mold size of the coke oven, and the resulting agglomerated coal with a frequency of 204 h~ is obtained. 3. A method for producing metallurgical coke, which comprises irradiating electromagnetic waves of 3 GHz to solidify the surface of the lumped coal, and then charging the coal into a coke oven.