基于电除尘器与煤质数据库的电厂煤质分析与除尘技术路线选择

随着环保要求和排放标准的日益严苛,对燃煤电厂超低排放的研究受到更多关注。建立了电除尘器与煤质数据库,包含了数百家燃煤电厂的煤质参数、电除尘器设计及运行参数。基于该数据库,对燃煤电厂动力煤的灰含量、硫含量分布情况进行分析。研究发现,从灰含量看,西南地区多燃用高灰煤,东北、华中、华北地区多燃用中灰、中高灰煤,沿海地区燃煤电厂多燃用特低灰、低灰煤;从硫含量看,西南地区燃煤电厂多燃用高硫煤,山东、山西、河南、河北等地区的燃煤电厂多燃用中硫煤,其他大部分地区多燃用特低硫、低硫煤。通过分析3座分别燃用低灰低硫、中灰中硫和高灰高硫煤电厂的颗粒物超低排放技术案例,针对不同煤质提出了颗粒物超低排放技术路线建议。

Characteristics of Power Coal and Recommendations on Dust Removal Techniques for Power Plants Based on the Database ofElectrostatic Precipitator and Coal Property

As the environmental requirements and emission standards are getting tighter, the research on the ultra-low emission of coal-fired power plants has attracted more attentions. In this paper, a database of electrostatic precipitator (ESP) and coal property is established, which consists of the coal properties and the ESP design and operational parameters of hundreds of coal-fired power plants across all regions of China. Based on the database, the distribution of ash and sulfur contents is analyzed using the coal samples collected from hundreds of power plants. The results show that the high-ash coals are quite common in Southwest China, while in Northeast, Central and North China the coals with medium or medium-high ash content are mostly burned, and in coastal regions the coals with low or ultra-low ash content are prevalent. In terms of sulfur content, the high-sulfur coals are mostly burned in Southwest China, while in the power plants of Shandong, Shanxi, Henan and Hebei provinces of China the medium-sulfur coals are generally burned, and the coals burned in other regions of China are mostly low or ultra-low in sulfur. Moreover, through the case studies on the application of ultra-low particulate emission techniques in three power plants fueled with low-ash & low-sulfur, medium-ash & medium-sulfur and high-ash & high-sulfur content coals respectively, recommendations are provided accordingly on the technical routes of ultra-low particulate emission with regard to different kinds of coal.