No abstract

No abstract

Tangentially fired boilers are widely used in generating electricity power due to its advantage of distributing heat evenly to all furnace walls. However, this type of boiler poses common temperature deviation at the upper furnace which may lead to temperature imbalance. This consequently may reduce the performance of the boiler which cannot be simply ignored. This paper investigates the flow and temperature imbalance in a 700 MW coal-fired boiler at full load and reduced load conditions. The effect of loading condition towards the temperature imbalance is investigated. It is observed that temperature imbalance occurs at the reheater plane between left wall and right wall where higher temperature was found near the left wall. Temperature imbalance is influenced by the loading condition, the higher the loading the higher the imbalance.

No abstract

The stringent requirement of power plant environmental emissions and the need to improve efficiency have led to significant rise of research in clean energy in this decade. Gas turbines are favourable in the power generating industries since it has environmental advantages besides capable to utilize variety of fuels like natural gas, fuel oils and synthetic gas. In recent years, the use of synthetic gas or syngas has been increasing due to its advantages such as CO2 and NOx emission reduction. Although many studies have been carried out in the area of syngas combustion, the study on the combustion characteristics and pollutant emission remains a challenge due to its complexity and limitless variety of fuel compositions involved. This paper presents the investigation of CO2 and NOx reduction on micro gas turbine combusting syngas with different methane compositions using computational fluid dynamics (CFD). The combustion trend of syngas is found to be similar to combustion with natural gas in general. However, the average temperature distribution is found to be very much dependent on the methane composition of the mixture. Higher methane composition is fuel results in higher average temperature distribution. The reduction of CO2 and NOx is predicted to be significant in combustion with syngas compared to conventional natural gas.