ABSTRACT

Thermal analysis technique was used to study the combustion characteristics of lignite, corn cob biomass, and their mixtures. Ignition, reactivity, peak and burnout temperatures, combustion time, and interactions between blend components were determined. Ashes were characterized by chemical, mineralogical, and fusibility analyses in order to assess their environmental impact, as well as slagging and fouling propensities. Combustion of corn cobs occurred between 220°C and 500°C, while that of lignite between 220°C and 730°C. When corn cobs were blended with lignite at percentages up to 30%, mutual interactions were less favored and the two fuels ignited and burned independently, presenting a high degree of additivity. Although corn cob ash was rich in K and P, ash melting of the mixture occurred 25°C lower as compared to lignite; however, the fouling rate was also lower. The similarity in burning characteristics of the fuels and the improved reactivity of the blends provide advantages for their co-firing in existing lignite infrastructures.

摘要

采用热分析技术研究褐煤、玉米芯生物质及其混合物的燃烧特性。确定了点火、反应性、峰值和燃尽温度、燃烧时间以及混合物组分之间的相互作用。通过化学、矿物学和易熔性分析对灰烬进行表征，以评估其对环境的影响以及结渣和结垢倾向。玉米芯的燃烧发生在 220°C 到 500°C 之间，而褐煤的燃烧发生在 220°C 到 730°C 之间。当玉米芯与褐煤以高达 30% 的比例混合时，相互相互作用不太有利，两种燃料独立点燃和燃烧，呈现出高度的可加性。尽管玉米芯灰中富含 K 和 P，但与褐煤相比，混合物的灰熔化温度降低了 25°C；然而，结垢率也较低。燃料燃烧特性的相似性和混合物的改进反应性为它们在现有褐煤基础设施中的共烧提供了优势。