ผลของตัวแปรดำเนินการต่อการปล่อยแก๊สระหว่างการเผาไหม้ร่วมของถ่านหินและชีวมวลในหม้อกำเนิดไอน้ำฟลูอิไดซ์เบสแบบหมุนเวียน / ชัยณรงค์ หาญชนะ = Effects of operating parameters on gaseous emission during co-combustion of coal and biomass in circulating fluidized bed boiler / Chainarong Hanchana
This research studied the Effects of operating parameters on gaseous emission during co-combustion of coal and biomass in circulating fluidized bed boiler (CFBB). The sub-bituminous coal and various types of biomass; palm shell, coconut shell, Giant Leucaena and Eucalyptus, were used in co-combustion. Fuel feed rate, primary air feed rate and solid circulation rate (silica sand return rate) were kept constant at 7 kg/hr., 300 l/min and 300 kg/hr., respectively. The CFB was attached with the steam generator which consists of 3 main parts, the warm space, the exchanger and the steam space. Here, effects of coal to biomass ratio in the mixed fuel, the secondary air feed position and the steam production efficiency were investigated. The results showed that the combustion of coal and palm shell gave higher temperature than the combustions of another biomass, due to the heating values of this biomass. An increase in mass ratio of biomass and coal was observed to decrease concentration of NOX. In co-combustion, the secondary air that entered at the position of 1 m. was the cause of maximum rate of nitrogen oxide emission. The CFBB system was then installed with steam production. This system can generate steam with the temperature of 160oC and the pressure of 2.6 bars when using 100% coal and steam with the temperature of 145oC and the pressure of 2.3 bars when using the ratio of coal and palm shell 70:30. Steam production efficiency was 22.44%.