tailieunhanh - Waste Treatment in the Process Industries - Chapter 13 (end)

Hơi thế hệ ngành công nghiệp điện được định nghĩa là những cơ sở chủ yếu tham gia vào thế hệ hơi năng lượng điện cho phân phối và bán. Những cơ sở sản xuất điện chủ yếu từ một quá trình sử dụng loại nhiên liệu hóa thạch (than, dầu, hoặc khí) hoặc nhiên liệu hạt nhân kết hợp với một chu kỳ nhiệt sử dụng hơi nước - hệ thống nước làm môi trường nhiệt động lực học. Ngành công nghiệp không bao gồm nhà máy hơi điện tại các cơ sở công nghiệp, thương mại, hoặc các | 13 Treatment of Power Industry Wastes Lawrence K. Wang Lenox Institute of Water Technology and Krofta Engineering Corporation Lenox Massachusetts and Zorex Corporation Newtonville New York . INTRODUCTION Steam Electric Power Generation Industry The steam electric power generation industry is defined as those establishments primarily engaged in the steam generation of electrical energy for distribution and sale. Those establishments produce electricity primarily from a process utilizing fossil-type fuel coal oil or gas or nuclear fuel in conjunction with a thermal cycle employing the steam-water system as the thermodynamic medium. The industry does not include steam electric power plants in industrial commercial or other facilities. The industry in the United States falls under two Standard Industrial Classification SIC Codes SIC 4911 and SIC 4931. There are about 1000 steam electric power generating plants in operation in the United States. Of these plants approximately 35 generate in excess of 500 megawatts MW and approximately 12 generate 25 MW or less. These steam electric power generating plants represent about 79 of the entire electric utility generating capacity and they generate about 85 of electricity produced by the entire electric utility industry. Within the steam electric power generation industry plants built after 1970 represent 44 of the total capacity and plants built before 1960 represent 26 of capacity. Small units are defined by the . Environmental Protection Agency USEPA as generating units of less than 25 MW capacity. Old units are defined as generating units of 500 MW or greater rated net generating capacity that were first placed into service on or before January 1 1970 as well as any generating unit of less than 500 MW capacity first placed in service on or before January 1 1974. The term 10-year 24-hour rainfall event refers to a rainfall event with a probable recurrence interval of once in 10 years as defined by the .