JPS6044432A - Transporting method of molded coal - Google Patents

Abstract

PURPOSE:To transport molded coal without breaking it by mixing the molded coal in pulverized coal so that the mixing ratio of the molded coal becomes a specific ratio and transporting the molded coal under this mixture condition when the molded coal is to be transported using a transporting means such as a ship. CONSTITUTION:Molded coal (a) produced at a molded-coal production facility 2 in a main plant 1 is merged with pelverized coal (b) fed on a conveyor belt from a pelverized-coal storage tank 3 and is temporarily stored in a mixture storage tank 4 as a molded coal-pelverized coal mixture c1. In this case, the mixing ratio of the molded coal (a) is set to 60wt% or less, where the total sum of the molded coal (a) and the pelverized coal (b) is 100wt%. Next, after the said mixture is heaped c3 at a loading yard 5, it is loaded on a ship 6 and is transported to a plant of destination. Thereby, the molded coal (a) can be prevented from being broken due to shocks during loading and vibrations during transportation, and the function of the molded coal (a) as a coke production material with excellent quality can be properly kept.

Description

[Detailed Description of the Invention] The present invention is capable of transporting briquette coal, which has been attracting attention as a raw material for metallurgy in recent years, without breaking even between remote locations using transportation means such as ships, trucks, and freight cars. It is related to the method.

In recent years, with the deterioration of the raw material situation, it has become increasingly difficult to produce high-quality coke using inferior quality coals such as non-caking coal and slightly caking coal, which are conventionally considered unsuitable as raw materials for producing metallurgical coke. Various methods have been studied to obtain this, and one of them is a method of partially blending briquette charcoal, which has already been put into practical use for some time. This method of partially blending pulverized charcoal involves mixing powdered coal with a binder made from raw materials, kneading, kneading, and then pressurizing the charcoal. This is a method in which the mixture is charged into a normal horizontal coke oven and carbonized.
Because the pulverized raw coal already contains pressurized briquette coal, and the binder in the briquette has the effect of compensating for caking, more cheap inferior quality coal is used than in the past. Not only can it be used for coal carbonization, but it also has the advantage of being able to use conventional coke ovens without investing in new equipment, and is currently considered to be one of the most effective methods. It is being implemented in various places.

However, even with such a method of partially blending briquette coal, equipment for producing briquette coal is essential, and investment in equipment for this is unavoidable. By the way, the briquette manufacturing equipment is constructed in front of the coke oven, but it would be unreasonable in terms of space and construction costs to construct this briquette manufacturing equipment in every coke manufacturing plant. Therefore, briquette production facilities are constructed only within the main crab farm, and the briquettes produced at the main crab farm are transported to other factories in remote areas by means of transport such as ships, trucks, or freight cars. It is preferable to use it. However, due to the harsh handling when transferring the briquettes using the above-mentioned transfer means, the briquettes (which have been pressure-molded into small charcoal shapes) crack and become powder, resulting in damage to the destination. At the factory, the inconvenience was that its effectiveness as briquette charcoal was halved.

The present invention was made in order to eliminate these drawbacks of the conventional methods, and even if the briquettes are handled in a harsh manner, they can be transported from a factory that manufactures briquettes to a factory in a remote location without damaging the briquettes. The purpose of this is to provide a method for transporting briquette coal by means of transportation such as ships, trucks, and freight cars, and the gist of this is that when briquette coal is transported by means of transportation such as ships, trucks, and freight cars, the mixing ratio of briquette coal must be 60% or less. The method of transferring briquette coal is characterized in that the briquette coal is mixed in powdered coal to prepare a mixture of briquette coal and pulverized coal, and the briquette coal is transferred in the state of the mixture.

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a flow chart for explaining the method of the present invention.

2 is a molded coal production equipment installed in the main crab die 1'', and the molded coal a produced in the production equipment 2 is cut onto a conveyor belt from a powder storage tank 3 such as a blending tank. The pulverized coal is combined with the pulverized coal mixture C1 and temporarily stored in the mixture storage tank 4.The pulverized coal in this case is
It may be a single coal of a specific brand or an intermediate blend coal with a certain amount of black blend, but in order to charge it into the coke oven 10 described later without further blending operation at the destination. It is preferable that pulverized coal is one that has already been completely blended. In addition, the mixing ratio of briquette coal a is 60% when the total amount of pulverized coal and briquette coal is 57,100% by weight.
It should be set so that it is less than % by weight; if it exceeds this value, the U-impingement effect of powdered coal on briquette coal will decrease rapidly, and the briquette will lose its shaping effect during handling at various locations. destroy it to the extent of The briquette coal mixing ratio here is the mixing ratio at the time it is mixed with powdered coal, and if the briquette coal is pulverized during handling up to this point, the amount of powdered coal is considered to be pulverized coal and mixed. There is a need to. There is no particular limit on the lower limit, but if the mixing ratio of briquette coal is too small, the purpose of transferring briquette coal will not be met, so it is preferably at least 10%, usually 20% or more. The pulverized coal mixture C1 once stored in the mixture storage tank 4 is extracted as appropriate (・C2), and is piled up at the familiar yard 5Vc for cargo handling using transport means such as trucks, wagons, and conveyor belts (not shown). (・C3), and is loaded onto a ship 6 by appropriate cargo handling equipment and sent to a factory 7 located in a remote location.

The pulverized coal mixture C4 transferred to the transferred factory 7' by the ship 6 is unloaded (C5) by cargo handling equipment such as an unloader (not shown), and once loaded in the open at the raw material yard 8, it is transferred to the gantry as appropriate. It is sent to the blending tank 9 by a transport means such as a crane or a conveyor belt (C6).

If the pulverized coal mixture C6 stored in the blending tank 9 has already been blended to obtain a predetermined coke strength, it is left as it is; if not, it is newly blended with other materials based on a predetermined blending ratio. The brand of coal was cut out at the same time to complete the blend, and the coal d was produced in the coke oven 10.
The coke is then carbonized into coke.

As mentioned above, when briquettes produced at one particular factory are transferred to another factory in a remote location, the briquettes are subjected to harsh impacts during loading and unloading and vibrations during transport, which would normally be As a result, most of the coal is destroyed and crushed, and the function as a long and thin coke production raw material is almost lost.However, in the present invention, powdered coal is used to buffer the impact and vibrations mentioned above. A mixture of briquette coal and pulverized coal is prepared so that the briquette charcoal is buried inside, and this mixture is transferred, so this pulverized coal effectively absorbs shocks and vibrations, allowing the briquettes to be transferred without being completely destroyed. Therefore, coke production activities can be started with minimal capital investment, without having to build briquette production equipment at every coke production plant, and can be handled by transferring briquette production equipment from factories that have briquette production equipment. The degree of freedom can be improved. Furthermore, since the powdered coal used as the buffer used in this case is a raw material for the briquette coal partial blending method, the mixture once mixed at the destination is not separated into its original state. It can be used as a charging material to a coke oven, which is extremely convenient.

Next, Example F is given to further explain the method of the present invention! Play J1. "Not more than 1%" indicates weight %.

Example: In order to find out how to set the mixing ratio of powdered coal and molded coal, it is possible to transport the molded coal over long distances while effectively preventing the destruction of the molded coal. After packing s kg of a sample of the pulverized coal mixture into sandbags and dropping it from a high place several times, the unpulverized rate of molten coal (percentage of the molten coal initially used that did not become pulverized even after the drop test) was determined. was measured.

The test conditions are as follows.

・Size and shape of sample briquette charcoal: 33cc7 lion, pea charcoal ・Test pulverized coal: normal charging coal (amp) 82%) ・Test amount of pulverized charcoal mixture: kg ・Multiple charcoal mixture ratio: 40.60.80. 4 cases of 100 semi-dilute % - 3 repeated points for each of the above 4 cases - Sample falling height 3.5 m (floor is concrete) - Number of drops per point 25 times - Unpulverized briquette charcoal after testing The ratio of 15ff is expressed as the percentage above the sieve with a mesh size of 15ff or higher.If the sample is dropped at a height of 3 sm and the number of drops per point is set at 25 times, and the briquette is transported by ship, #1 is the height above. This is because it was simulated (realized in a simulated manner) to be handled in such a way as to fall the number of times mentioned above.

The test results are shown in the table below.

As can be seen from this table, when the blending ratio of briquette coal was 60% or less, the unpowdered charcoal rate was more than 84%, even though the severe drop test was conducted, that is, the briquette coal crumbled and the pulverization rate was 15% or less. It can be seen that the powdering rate is 16% or less, which is good.

Incidentally, FIG. 2 is a graph representing the results of the above table, in which the horizontal axis shows the pulverized coal mixing ratio and the vertical axis shows the unpulverized ratio of molded coal. This graph shows that the pulverization of briquette coal is significantly reduced when the pulverized coal mixture ratio is 40% or more, that is, when the briquette coal mixture ratio is 60% or less.

[Brief explanation of drawings]

Fig. 1 is a flowchart for explaining the entire method of the present invention, and Fig. 2 is a graph showing the relationship between the pulverized coal mixing ratio and the unpulverized ratio of molten coal after performing a drop test on a specimen of a pulverized coal mixture. . 1... Main crab farm, 2... Molded coal manufacturing equipment, 3...
Powdered coal storage tank, 4...mixture storage tank, 5...loading yard,
6... Ship, 7... Molded coal transfer factory, 8... Raw material yard, 9... Blending tank, 1o... Coke oven, a.
... Molded coal, b... Powdered coal, ci-c6... Molded coal and powdered coal mixture itself or the act of transferring it, d... Charged coal Figure 1 Figure 2

Claims (1)

[Claims] 1. When transporting briquette coal using transport means such as ships and trucks, freight cars, etc., the briquette coal is mixed with powdered coal in advance so that the blending ratio of briquette coal is 60% or less. A method for transferring briquette coal, which comprises preparing a mixture of pulverized coal and pulverized coal, and transferring the briquette coal in the state of the mixture.