Purpose. Direct the process of semi-coking of sapropelite coal to obtain primary tars and combustible gas as the target product using semi-coke from previous cycles as a heat source. Combustible gas is used at further stages of production to fractionate the resin according to the fuel scheme.
Specifications. The duration of the semi-coking cycle is 110-130 minutes, depending on the fractional composition and technical characteristics of sapropelite coal, primarily ash content. The temperature in the semi-coking sections is maintained by the air flow in the combustion sections at the level of 500-540 C. The load weight to achieve a minimum economic effect starts from 5 tons per section.
Application area. Chemical and petrochemical industry (fuel industry, coal industry); consumers are coal mining enterprises in the regions where sapropelite coal is removed to the surface along with minerals (SE “Lvovugol”).
Advantages. Available technologies for processing sapropelite coal use schemes taken from coke production, the target product of which is coke. The developed technology is aimed at producing resins for the fuel and chemical industries, allowing for maximum yield of flammable gases and resins. Taking into account mild temperature conditions, the heat exchange surfaces in the semi-coking furnace are made of metal, which significantly increases the efficiency of heat transfer and reduces heat loss. Thus, the technology is characterized by greater energy efficiency. The technology involves the extraction of sapropelite coal from dumps (heaps), which entails an improvement in the environmental situation in coal mining areas.
Technical and economic effect. The social and economic significance of the project is to provide the population with local affordable energy resources, which will reduce household costs; creation of new jobs both in areas of extraction and processing of substandard raw materials, and in the chemical industry; reduction of technogenic load in areas where rock dumps are located.
Description. Sapropelite coals are pre-prepared by crushing and classifying into fractions of 7-15 mm. The battery furnace is divided into two separate gas spaces, in which semi-coking of sapropelite coal is alternately carried out at temperatures ranging from 500-540 C or combustion of semi-coke from the previous cycle with forced air supply. Resin mist and semi-coking gases enter the separator, in which the primary tar is separated, and the gas is sent to a gas holder, from where it is supplied by a compressor to the radiant heater of the tar fractionation system according to the fuel circuit. Hot combustion gases are used to heat the discharge air. The final products are fractions of semi-coking resins, such as fuels and lubricants or raw materials for the chemical industry.