การเผาไหม้เชื้อเพลิงผสมถ่านหินและชีวมวลในฟลูอิไดซ์เบดแบบหมุนเวียน

• 主要作者: ชัยวัฒน์ พรหมภูเบศร์
• 其他作者: เลอสรวง เมฆสุต
• 格式: Theses and Dissertations
• 語言: Thai
• 出版: จุฬาลงกรณ์มหาวิทยาลัย 2004
• 主題: เชื้อเพลิง; การเผาไหม้; ฟลูอิไดเซชัน; ถ่านหิน; ชีวมวล
• 在線閱讀: https://digiverse.chula.ac.th/Info/item/dc:35541

In this research, co-combustion of coal and rice husk was studied in a 3.5 kW circulating fluidized bed combustor (CFBC). The riser has a diameter of 0.1 m. and its height is 3.0 m. Coal from Maetah, Lampang with an average particle size of 1128 micro m. was mixed with rice husk and was burnt in this CFBC. The effects of operating conditions namely coal to biomass ratio, primary and secondary air flow rate on temperatures and gas concentrations along the riser were studied. Three ratios of coal to rice husk i.e. 100:0, 65:35 (7% by wt. biomass) and 80:20 (3.5% by wt. biomass) were investigated. The fuel feed rate constants at 5.8 kg/hr. The primary air has been changed between 480 and 920 liter per minute (correspond to velocity of approximately 1.0-2.0 meter per second) and the secondary air ranged from 0-330 liter per minute. On-line concentrations of carbon monoxide, carbon dioxide, nitrogen oxides, nitrogen dioxides and sulphur dioxide were measured along the riser with flue gas analyzer. The temperatures along the riser were found to vary between 800 and 1000 ํC. However, when the primary air flow rate is more than 920 liter per minute, the addition of secondary air has no profound effect on temperature profile. Carbon monoxide emissions were very high (about 10000 ppm) at the bottom of the bed and rapidly decreased toward the point where secondary air was injected. Oxigen dioxide decreased along the riser. Carbon dioxide and sulphur dioxide were found to increase along the riser. The concentrations of nitrogen oxides and nitrogen dioxides were relatively constant at the values of about 100 and 10 ppm respectively. When the percentage of biomass increased, the temperature was also increased. Finally, the experimental results have shown that the carbon monoxide and sulphur dioxide emissions tended to decrease at higher concentration of biomass.