SUMMARY

RESEARCH OF ELECTRIC AND HEAT PHYZICAL COAL CHARACTERISTICS IN PYROLYSIS PROCESS

Introduction

Nowadays the high requirements are presented by cokechemical enterprises to production technologies and coking products. In this connection methods of coke quality forecasting are being developed on the basis of coal mixture composition. This process is complicated by the fact that results of researches, which were conducted to determine heat coal physical parameters, are very outdated, as they date back to 50th of last century. How we have run out of this coal and enterprises started receive raw materials from Russian suppliers, as has these raw materials higher quality.

Coal,  which the researches were organized for, has already ended, and in spite of the fact that its mining goes on the same mines, with the increase of depth of the mining, its characteristics are completely changed even though the grade of coal remains unchanged.

With coal mixture changing the new material balance of coking process is calculated for coke gas that causes additional material expenses as only specialized institutes have necessary methods and data. Thereby, it is necessary to simplify and automate the process of calculation.

Domestic science has paid little attention to such an important physical factor, as electric resistance of coke. This factor is one of quality features of hard pyrolysis remainder.

 

Method of the experiment

We have designed the following laboratory installation. An oven was used electric oven of type TG-02B with power 2,2 kVt allowing to heat  before 1000 has been used as a heating ovenС. Regulation of powers and velocities of the heating oven was conducted by means of a  transformator. Space between oven cover and heating element was filled by asbestos. The electrodes were made from stainless steels to avoid the oxidation in aggressive ambience. The Internal electrode was used as the source of the voltage, and external was grounded. Coal was loaded only in to free space between internal and external electrode that enabled to carry out the even heating of loading. The thermocouple to measure the temperature was sunk right in to the coal loading after preparing the loading by a special method. Collection and primary data processing were produced by means of a computer.

The known package ANSYS was used to decide the problem of finding the sharing of temperature along the width of the loading. It allows to solve the problems of calculation of the distribution by warm-up fields, dinamics of liquids and gas, electromagnetic and acoustic fields. The method of final elements is a numerical method, which is used for decision of the big class of engineering problems.

 

Picture 1 - Dependency of anthracite, thermo anthracite and coal conductivities on temperature

Picture 2 - Geometric sizes of the installation and sharing the temperature along the width of the loading time

 

Results of the research

Sharing the temperature was calculated by means of this package for conditions of the experiment with chosen geometric and heat physical features of coal loading.

Developed method allows to find by warm-up field distribution at nonstate mode of heating taking account of change of coal heat physical parameters, as well as stainless steel and asbestos, which take part in process.