2018 Volume 51 Issue 9 Pages 762-768
To investigate the energy potential of liquid foundry wastes, the co-firing of coal and two waste solvents with relative smaller heating value was studied in a bubbling fluidized bed combustor. The effects of the bed temperature, liquid fuel type, liquid ratio, and the particle size of coal on the co-firing characteristics and pollutant emissions characteristics were investigated. The results showed that the co-firing of coal and waste solvent can be adopted as an alternative for waste disposal, ensuring energy recovery and waste disposal in a single step. NO emissions are still dependent on the total nitrogen content in the fuel feeding material. For the two waste solvents, NO emission increases with liquid ratio, and the highest value was 447.5 ppm, which exceeds the NO emission requirement. Increased bed temperature had little effect on the co-firing characteristics of coal with waste solvents, but the NO emission significantly increased from 137 to 319 ppm as the bed temperature increased from 750 to 850°C. Decreasing the coal particle size increases the CO emission, which creates the proper atmosphere for NO reduction.
