Types and Application of coal

Coal is a fossil fuel formed in swamp ecosystems where plant remains were saved by water and mud from oxidization and biodegradation.

煤是沼泽生态系统中形成的化石燃料，在沼泽生态系统中，植物残骸在水和泥浆的氧化和生物降解作用中被保存下来。

Coal is a readily combustible black or brownish-black rock. It is a sedimentary rock, but the harder forms, such as anthracite coal, can be regarded as metamorphic rocks because of later exposure to elevated temperature and pressure.

煤是一种容易燃烧的黑色或棕黑色岩石。它是一种沉积岩，但较坚硬的形式（如无烟煤）由于后来会暴露在高温高压下，因此可视为变质岩。

It is composed primarily of carbon along with assorted other elements, including sulfur. It is the largest single source of fuel for the generation of electricity world-wide, as well as the largest source of carbon dioxide emissions, which is the primary cause of global warming.

煤主要由碳和其他元素（包括硫）组成。它是全球发电的最大单一燃料来源，也是最大的二氧化碳排放源，二氧化碳是全球变暖的主要原因。

Coal is extracted from the ground by coal mining, either underground mining or open pit mining.

煤炭是通过地下开采或露天开采从煤矿中开采出来的。

Types of Coal

As geological processes apply pressure to peat over time, it is transformed successively into the following types of coal.

随着时间的推移，地质作用对泥炭施加压力，它逐渐转变为以下类型的煤。

Lignite also referred to as brown coal, is the lowest rank of coal and used almost exclusively as fuel for steam-electric power generation. Jet is a compact form of lignite that is sometimes polished and has been used as an ornamental stone since the Iron Age.

褐煤也被称作褐煤，是变质程度最低的煤，几乎完全用作蒸汽发电的材料，黑玉是褐煤的紧凑形式，有时经过抛光，从铁器时代起就被用作装饰石。

Sub-bituminous coal whose properties range from those of lignite to those of bituminous coal and is used primarily as fuel for steam-electric power generation.

亚烟煤的性质介于褐煤和无烟煤之间，主要用作蒸汽发电的燃料。

Lesson1 Part2 https://blog.donothing.cn/index.php/2020/06/30/lesson1-part2/

谷歌翻译：https://translate.google.cn/

可定制翻译软件：http://shell.donothing.cn/