Effect of ammonia co-firing ratio on the formation of condensable particulate matter in pollutants during coal/ammonia co-combustion

Abstract

In this paper, the influence of zero-carbon ammonia co-firing ratio during coal/ammonia combustion on the generation of condensable particulate matter(CPM) was investigated. 0%, 10%, 20%, 30% and 50% ammonia were mixed into the coal combustion according to the energy input ratio to collect the discharged CPM and FPM in laboratory and the composition of flue gas was tested. The results show that mixing ammonia into coal combustion had little impact on the total concentration of CPM. The main reason is that the ammonia co-firing into coal can promote the formation of inorganic matter of CPM, and the concentration of organic matter decreased. The mass of FPM decreased when the proportion of ammonia is increased. In addition, co-combustion of ammonia inhibited the formation of SO2 that discharge to the atmosphere. The main reason is that the mass of coal decreased with the increasing of calorific value of ammonia. In addition, the co-firing of ammonia can promote the conversion of S to FPM and CPM. The reason is that H came from NH3 burned to produce water vapor, then water vapor can combine with sulfur dioxide. Peak areas of some organic substances are drawn with the variety of ammonia co-firing ratio. Most of the substances in alkanes are N-alkanes. The conclusions in this paper are of great significance to the further understanding of migration and transformation of pollutants under the influence of ammonia co-combustion. In addition, the research in this paper provides a theoretical basis for achieving the goal of carbon neutrality.