JPS5920387A - Preparation of improved coal - Google Patents

Abstract

PURPOSE:To obtain improved coal having a size capable of preventing evolving of dust durig storage and flying of the dust out of the coal yard, by coating coal from which oil has been extracted with the extracted oil followed by classification and then subjecting only a small partcle to submerged granulation. CONSTITUTION:After crushed by a crusher 2, coal, e.g. low-quality coal 1 is dry distilled in a retort 3 to extract contained moisture and oil. The dry distilled coal is coated with, e.g. a portion of the extracted oil to form coated improved coal 5. Then the coal 5 is classified by a screen 6 into coated improved coal 7 on the screen 6 and coated improved coal unde the screen 6. The under-screen coal is granulated in water with remaining extracted oil by a submerged granulator to form granulated coal 9. The granulated coal 9 is supplied to, e.g., a coal yard and stored as improved coal 10 together with the coated improved coal 7 on the screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing modified coal, and in particular, a method for producing modified coal that is suitable for producing reformed coal using low-quality, low-quality coal such as lignite. It is related to.

Conventionally, as a method for producing modified coal with low moisture content and excellent moisture resistance using low-grade coal that contains a large amount of moisture and has strong hygroscopicity, such as lignite, low-grade coal is used. Low-rank coal (hereinafter referred to as
There is a known method of coating carbonized carbon (abbreviated as carbonized coal) to form coated modified coal.

The coated modified coal formed by this method has low moisture content and excellent moisture resistance, but on the other hand, even if carbonized coal is coated with extracted oil, Since coal particles hardly adhere or bond to each other, there is a drawback that coated modified coal is large enough to generate dust during coal storage and scatter into the coal storage yard.

The purpose of the present invention is to solve the above-mentioned drawbacks of the prior art, and thereby improve reforming that can obtain reformed coal of a size that can prevent dust generation during coal storage and its scattering outside the coal storage mjR. The purpose of the present invention is to provide a method for producing charcoal.

The patent of the present invention is to reduce dust generation during coal storage by classifying the oil-extracted coal, coating it with the extracted oil, and then granulating only small particles in water.
The purpose is to obtain reformed coal of a size that can prevent it from scattering outside the coal storage yard.

An embodiment of the present invention will be described with reference to the drawings.

In the drawing, coal, e.g. 5 low rank coal 1, is pulverized in a pulverizer 2 and then carbonized in a carbonization device 3 to extract water content and oil. For example, a part of the extracted oil 4 is used. Coated modified coal 5 is formed by coating the carbonized coal. After that, the coated modified coal 5 is passed through a sieve 6
The coal is classified into coated modified coal 7 on the screen of the sieve 6 and coated modified coal below the screen. The coated modified coal under the screen is granulated underwater in an underwater granulator 8 using the remaining extracted oil to form granulated coal 9. Thereafter, the 20 granulated coal 9 and the coated modified coal 7 on the mesh are supplied as modified coal 1O to, for example, a coal storage yard (not shown) and stored. Next, according to this example, the water content 2
When modified coal was produced using 5% low-rank coal, the following results were obtained.

First, low-grade coal with a water content of 25% was pulverized into 16 pieces and carbonized at a feed pressure of 400°C to extract the water content and oil.

In this case, the extracted oil content is 4%, of which 2%
The oil was used to coat carbonized coal to form a coated modified coal. Next, this coach ink modified coal was classified using a sieve with a mesh size of 05, and as a result, the coated modified coal on the screen was 70 cm, and the coated modified coal under the screen was 30 cm.
%. Therefore, we used the remaining 2% oil extracted from the coated modified coal under the mesh (6% oil was added to the coated modified coal under the mesh).
As a result of underwater granulation, granulated coal with an average particle size of 111I11 was formed.

In the method of this example, the formed coated modified coal is classified using a sieve, and the coated modified coal under the screen is granulated in water using the remaining extracted oil to form granulated coal. Furthermore, it is possible to obtain modified coal that has a low moisture content, has excellent moisture resistance, and is large enough to prevent dust generation during coal storage and its scattering outside the coal storage yard. In the example, the oil required for underwater granulation was covered only by the oil extracted by carbonization, but if the oil required for granulation is insufficient from the extracted oil alone, 1 [
Although oil or the like may be used, it is more economical to avoid supplying oil from outside the system as much as possible. Conversely, if there is excess extracted oil, the carbonization temperature can be lowered.

Further, the opening of the sieve may be set to a size that allows only the coachib modified coal of a size that is likely to be scattered outside the coal storage yard due to coal storage to be screened out. For example, if the wind speed is xOm/S, the size of coated modified coal that will fly over 100m is approximately -0.25cm. Therefore, if the boundary with the coal storage yard is 100m, the size A is generally between 1025m.

All you have to do is classify it to eliminate coated modified coal. On the other hand, if the classification point is raised, for example, if it is classified by 1 tube, the amount of sieve will increase and the number of trays of coach ink modified coal that must be granulated underwater will increase, which is necessary for underwater granulation. This will lead to an increase in the number of oil workers.

Therefore, there is an appropriate classification point, and 05 is generally an appropriate value.

Furthermore, after carbonization, the carbonized coal is classified, and the carbonized coal on the mesh is coated with the extracted oil to form a coated modified coal, and the carbonized coal under the mesh is granulated in water to form granulated coal. may be formed.

As explained above, the present invention involves classifying coal from which oil has been extracted and coating it with the extracted oil, and then granulating only small particles in water. Since granulated coal can be made with a large size, it is possible to obtain modified coal of a size that can prevent dust from being generated during coal storage and scattering outside the coal storage facility.

[Brief explanation of the drawing]

The drawing is a process flow diagram showing an example of a process for manufacturing modified coal according to the present invention. 1...Low rank coal, 2...Crusher, 3.
... Carbonization equipment, 4 ... Oil content, 5 ...
・Coated modified coal, 6...Sieve, 7...
... Coated modified coal on a mesh, 8 ... Underwater granulation device, 9 ... Granulated coal, 1o ...
Modified coal agent Patent attorney Usui 1) Toshiyuki

Claims (1)

[Claims] 1. A method for producing modified coal, which comprises classifying and coating coal from which oil has been extracted, and then granulating only small particles in water.