Đang chuẩn bị liên kết để tải về tài liệu:
ENCYCLOPEDIA OF ENVIRONMENTAL SCIENCE AND ENGINEERING - FLUIDIZED BED COMBUSTION

Công nghệ phản ứng hạt than bị đình chỉ với một khí chảy qua chúng trở lại những năm 1920 khi các máy phát điện Winkler khí đã được phát triển ở Đức. Ngành công nghiệp dầu khí chịu trách nhiệm cho việc mở rộng thương mại của kỹ thuật tầng sôi ở Mỹ (năm 1940), đặc biệt là trong việc sử dụng của các chất rắn xúc tác nứt bay hơi dầu nặng để sản xuất xăng và nhiên liệu dầu khí khác. Việc áp dụng công nghệ tầng sôi (FBC) đốt (để nhiên liệu rắn khác nhau) là. | F FLUIDIZED BED COMBUSTION INTRODUCTION The technology for reacting suspended coal particles with a gas flowing through them dates back to the 1920s when the Winkler gas generator was developed in Germany. The petroleum industry was responsible for the commercial expansion of fluidization techniques in the U.S. 1940s particularly in the use of solids which catalytically crack vaporized heavy oils to produce gasoline and other petroleum fuels. The application of fluidized bed combustion FBC technology to various solid fuels is widespread in the U.S. and in other countries for all types of industrial processes. More than 350 atmospheric fluidized bed units are operating in North America Europe and Asia. FBC is part of the answer to the question how do we control our major emissions from coal sources Briefly an FBC boiler is a finely divided bed of solid fuel particles in admixture with limestone particles which are suspended or conveyed by primary combustion air moving in the vertical upward direction. The limestone reacts with sulfur dioxide to remove it from the flue gas. The low uniform temperature ca 1550OF has a beneficial effect on nitrogen oxide suppression. The emission from coal combustion schemes of nitrogen oxides NOx and sulfur dioxide SO2 together with carbon oxides CO and CO2 particulate matter and solid wastes must always be compared when evaluating various alternative schemes. The potential consequences of gaseous emissions include the greenhouse effect and acid rain which have received much publicity in recent years. The practical FBC limit of SO2 removal is currently about 95 . Nitrogen oxide formation is lower than with conventional pulverized coal PC boiler NOx control. TYPES OF FLUIDIZED BED COMBUSTORS FBCs FBCs are generally referred to as either circulating CFB or bubbling beds. However the bubbling type may be classified according to whether reaction takes place at atmospheric AFB or under pressurized conditions PFB . A. Circulating Fluidized