褐煤是一种只经过岩化作用而质变作用不充分的煤,有的仍保持植物的原貌,其本质、年轮尚清晰可辨,它们是煤由植物转化而来的最好见证。虽然褐煤有水分含量高,热量较低,燃烧时烟雾大等弱点,但其用途却十分广泛,不仅可作燃料,还可用于气化、液化、炼焦和提取化工产品等等。 Lignite is a type of coal that undergoes only a qualitative change only by petrification. Some maintain the original appearance of plants. Its essence, the annual rings, are still clearly discernible. They are the best testimony to the transformation of coal from plant to plant. Although lignite has a high moisture content, low calorie, smoke and other weakness when burning, but its use is very extensive, not only for fuel, but also for gasification, liquefaction, coking and extraction of chemical products and so on.