SU356289A1 - METHOD OF MANUFACTURING FORMED COKE - Google Patents

Description

This invention relates to the field of coke-chemical technology and, in particular, to methods for producing molded coke.

Known methods for the production of molded coke consist in molding the charge followed by calcining the molds.

The disadvantages of these methods are that they do not provide the necessary efficiency and the possibility of using poorly coking coals.

The purpose of the present invention is to eliminate these drawbacks.

The difference of the proposed method lies in the fact that low-caking coal is crushed into fractions of 3-0-g12-O mm and divided in an aqueous medium into light and heavy concentrates, the heavy concentrate is subjected to semi-coking, after which the light concentrate is mixed with the obtained semi-coke in about 1: 1 and the mixture is molded.

The proposed method is as follows.

The processed coal (concentrate) to be processed is divided by (density into light, well-caked and heavy, poorly caking parts (light and heavy concentrates). The heavy concentrate undergoes a half treat. The hot half-box is displaced with the preheated light

a concentrate which is the sintering component of the mixture and is heated by a semi-coke to the temperature of the plastic state. The resulting mass is directed to molding (pressing briquetting). The molds are calcined and the coke briquettes thus obtained are cooled.

The proposed method for the production of molded coke is presented in the form of a technological scheme, which shows the sequence of coal processing operations. The scheme has the following notation: LK - light concentrate, TC - heavy concentrate, PC - semi-coke, LP - volatile

products, F - molding, FC - molded coke.

The original low-caking coal, which is a combination of mineral impurity content, petrographic composition and sintering fractions, is divided in terms of density into light good-quality and heavy low-creeping concentrates (operation I). Separation is carried out in jigging machines or in

t mediating apparatus in the process of enrichment of coal. Under industrial conditions, classes larger than 0.5 mm are separated, and containing an increased amount of fusen and usually drying dust that does not need to sit down on a heavy concentrate.

Before separation, coal is subjected to crushing, the extent of which depends on the type of coal, in order to ensure the required properties of light and heavy concentrates. In the study of coal in the western and central regions of Donbass, the degree of fragmentation ranged from 3-O to 12-O mm. The yield of light and heavy concentrates is determined by the density over which separation occurs. The latter is selected taking into account the desired characteristics of the separation products so that the .BfcoBoe ratio of sintering and emaciated (semi-coke) components in the moldable mixture, taking into account the mass loss of coal in the semi-coking process, is 1: 1. The value of this ratio is established experimentally and is optimal.

After grinding to a grain size of 3-O mm (step 2), a heavy concentrate is fed to semi-coking, which (step 3) is carried out by one of the known methods in fluid bed apparatuses or using solid heat carrier at a final process temperature of about 600 650 ° C. At the same time, the yield of volatile substances from the semi-coke (Y) should be “a level of 8-16%.

For example, as a result of the separation of the low-cushion coal of Western Donbassk No. 16-17 with a particle size of 8-O mm in a heavy liquid with a density of 1.25 g / cm, light and heavy concentrates were obtained.

During semi-coking of heavy concentrate, the yield of semi-coke was 75%, 11%, 5%. The ratio of the selected light concentrate and semi-coke from heavy concentrate is 42.4: 57.6.0,: 1, which corresponds to the optimal value.

The hot α-semi-coke is mixed (operations 4) with pre-crushed (operation 2) and light concentrate, quickly heated to a temperature of 350 ° C (operation 5). At the same time, the semi-coke during the mixing process reheats the light concentrate to a plastic state and the mixture, the temperature of which is 450 ° C, is sent to the molding.

The molding (step 6) is carried out under a pressure of 20 kg / cm in a screw or crawler type press-molding machine. Moldings of a given density and configuration are fed to calcining (step 7), which is carried out in continuous kilns at a temperature of 800 ° C. Cooled cokes - molded coke is a finished product of production.

Volatile and vapor-and-gaseous products of semi-coking and calcining are directed to the trapping system.

A distinctive feature of the proposed method is the separation of the sintering component and the production of semi-coke heat carrier and an emaciated component of a formable mixture from the same initial low-caking coal. The presence of this feature allows the production of cheaper molded coke from low-coking coals alone with high quality molds.

In the described manner, weakly burning coals can be processed. It is especially rational to use it for processing petrographically heterogeneous coals, which are a natural mixture of various microcomponents, the ratio and

whose properties do not allow the processing of such coals by known methods.

The method has been tested on a laboratory scale on weakly interfacing low-metamorphosed coal. Subject to the above

above the technological parameters of the process, the obtained molded coke is characterized by the following indicators: porosity 40–60%, with, structural strength according to Grznov 60–65%. When processing in

In the laboratory drum, coke briquettes are only rounded on the surface (M4 85-90%).

Subject invention

The method of producing molded coke by molding the shunt with subsequent calcining of the molds, characterized in that, in order to increase the efficiency of the method and the use of low-grade coal, the weakly coking coal is crushed into 3-0-n 12-O mm fractions and divided into light and heavy concentrates, heavy concentrate is subjected to semi-coking, after which the light concentrate is mixed with the obtained

semi-coke in a ratio of about 1: 1 and the mixture is subjected to molding.

1 / 1smv / 1 up to 3-hmm

in

/ 7-round grading

P

Volatile proEukgoy 8 cucmefli / up.8li &

Source / go /)

Expansion by n / iomHocftiu

x

Radiation Eo 3-Qm 5

PC

1 .a6tance

17

reforming

Glowing.

F "

, Cooling

Finished Coke Briquette-Regulated Coke