炼焦

炼焦	liàn jiāo	coking / the process of producing coke from coal
炼	liàn	to refine / to smelt
炼	liàn	variant of 链, chain / variant of 炼
焦	Jiāo	surname Jiao
焦	jiāo	burnt / scorched / charred / worried / anxious / coke / joule (abbr. for 焦耳)