Gaseous emission characteristics in a coal and biomass co-fired 18.98 MW power plant

摘要

Concerns regarding the potential global environmental impacts of fossil fuels used in power generation and other energy supplies are increasing worldwide. One means of mitigating these environmental impacts in increasing the fraction of renewable and sustainable energy is in the national energy supply. One such combination of renewable and fossil energy utilization that derives the greatest benefit from both fuel types is co-firing biomass with coal in traditional coal fired boilers. When proper choices of biomass, coal, boiler design and boiler operations are made, the traditional pollutants (NO_X and SO_2) and net greenhouse gas (CO_2, CH_4 etc.) emissions have been found to decrease. Clearly, co-firing also carries with it technical risks like reduction in plant availability and flexibility in operation. The other risks are the increase in maintenance and replacement costs associated with the biomass handling and firing equipment. This paper discusses about the 'gaseous emission characteristics namely NO_X and SO_2 from a 18.98 MW power plant, when biomass was co-fired with coal in 3 mixing ratios of 20,40 and 60 by mass. The biomass fuels that were used in these tests are wood chips (Julia flora), cane trash and coconut shell.