low-quality coal

• 劣质煤

low-quality coal的用法和样例：

例句

1. It intuoduces the tech-economic effects about transforming chain furance to fluidizing bed,provides conditionsFor faulty coal use.
   介绍链条炉改成沸腾炉的技术经济效果，为改善链条炉操作性能，为劣质煤的推广应用，提供了完全可能实现的途径。
2. The procedure for reformation and the new spiral-tube type of air preheater used may be well observed by other thermal power plants where boilers are fired with low quality coals.
   改造采取的措施及采用新型的螺旋槽管空气预热器，可对燃用劣质煤的电站锅炉改造起到良好的借鉴作用。