Coal grade Zh is used exclusively for making coke, smelting cast iron and steel. It makes coke durable. But it should be borne in mind that this brand has coals with too much sintering. To improve the performance of coke, it is necessary to add skinny brands - G, DG, T, SS and others. The high VOC content prevents this brand from being used in boilers. Combustion can not be regulated, with the smoke loses a large amount of heat. However, enrichment waste is sometimes used as fuel. But they are a lot of sulfur, so for home boilers such material is not worth buying.
