They also tend to produce poor-quality coal which generates relatively high levels of pollution when burned.
他们也倾向于生产劣质煤，这些煤在燃烧时产生相对高的污染水平。
The coal it produces is mostly poor in quality and rich in ash; it should be washed before shipping to make it more efficient, but is not.
它所产的煤炭大部分质量差而灰尘多；要想提高这些煤炭的效率，在装运之前应该要清洗但它们并没有被清洗过。
And Indian coal is generally of poor quality, which makes it unsuited to newer, more efficient, coal-fired power stations.
而印度的煤炭质量差，不能适用于更高效的新型煤炭发电厂。
The problems that medium coal ash is difficult to control and the quality of raw coal is going poor in the application of Wangfenggang coal Preparation Plant are exposed.
该机在望峰岗选煤厂应用中，暴露出当入选原煤质量变差，中煤灰分控制不住的问题。
Test results show that the reconstruction counteracts the impact of poor coal quality to some extent and is conducive to the economic operation of the boiler.
试验表明，上述改造措施能在一定程度上降低煤质差带来的负面影响，有利于锅炉的经济运行。
Calorific value of poor quality coal can be determined by addition of benzoic acid as standard, which can enhance the sample to burn out.
测定劣质煤的发热量时，在煤样中加入标准苯甲酸，帮助样品燃烧完全。
Calorific value of poor quality coal can be determined by addition of benzoic acid as standard, which can enhance the sample to burn out.
测定劣质煤的发热量时，在煤样中加入标准苯甲酸，帮助样品燃烧完全。
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