1870年后，西门子用蓄热式煤气炉代替焦炭炉。
After 1870 the Siemens regenerative gas furnace replaced the coke-fired furnace.
在太原，煤灰从煤矿、焦炭炉、大型工厂、锅炉、炉灶中大量排出。
In Taiyuan, soot poured from coal mines, coke furnaces and other major factories, as well as from apartment building boilers and kitchen stoves.
焦化作用是将煤转化为焦炭的热处理过程，涉及到将煤在焦炭炉中隔绝空气高温加热数小时。
Carbonisation is the thermal process for the conversion of coal into coke, involving heating coal at high temperature for many hours in the absence of air whilst contained in ovens.
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