Effect of additives on melting temperature and energy consumption of municipal solid waste incineration fly ash. Issue 12 (December 2021) - Gao, Jing
This paper presents the melting temperature (MT) and energy consumption (EC) of model municipal solid waste incineration (MSWI) fly ash (FA) under the influence of calcium oxide (CaO), silicon dioxide (SiO2 ), aluminium oxide (Al2 O3 ) and boron oxide (B2 O3 ) based on thermochemistry simulations. Nine different base-to-acid ratios (B/A) of raw FA have been explored. The results show that the effects of CaO, SiO2 and Al2 O3 vary for different B/A ranges. SiO2 and Al2 O3 play positive roles in decreasing the MT and EC of FA4–FA9 with high B/A (B/A: 2.61, 4.48, 6.43, 6.90, 8.32, 8.82). CaO plays a positive role in decreasing the MT and EC of FA1 and FA2 with low B/A (B/A: 0.22, 0.43). In FA3 (B/A: 1.22), the MT and EC of FA cannot be reduced by adding CaO, SiO2 and Al2 O3 . The addition of B2 O3 cannot only further reduce the MT of FA, but also reduce the EC. B2 O3 and SiO2 can work together to reduce the MT and EC when B/A is high (2.61–8.82), and SiO2 and B2 O3 can be introduced into the FA by adding waste glass and other boron containing waste to realize the coordinated disposal of waste.