PDF《1,050-MW Coal-Fired Boiler》

Experiences in Designing and Operating the Latest 1,050-MW Coal-Fired Boiler

100 Experiences in Designing and Operating the Latest 1,050-MW Coal-Fired Boiler OVERVIEW: In the fossil-fuel power utility area, the large capacity coal- fired boiler has been developed for higher efficiencies.

The Tachibana-Wan Thermal Power Station'

s No.

2 Unit (1,050 MW) was completed for the Electric Power Development Co., Ltd. (EPDC) in December of 2000. It has the advanced steam parameters of 25.0 MPa and 600/610?C. The 3,000-t/h coal-fired boiler for the unit was supplied by Babcock-Hitachi K.K. (BHK), who confirmed, during the commissioning period, that the boiler meets all of its performance specifications. To achieve these high-level steam parameters, newly developed high-strength materials were used in the high- temperature areas, and the latest combustion technology was used for environmental protection as well as for high levels of efficiency and reliability. This article focuses on the latest boiler technologies and operating experience during the commissioning process. Hideaki Iwamoto Jun'

ichiro Matsuda Yoshito Suzuki Ken'

ichi Ochi INTRODUCTION THE strength of demands for Japanese utility companies to reduce emissions of air pollutants and, in particular, of CO2, has led to a dramatic improvement in the steam conditions of thermal power plants in Japan, and thus to higher plant efficiencies.1) As shown in Fig. 1, steam conditions started to improve dramatically from

1995 and Babcock-Hitachi K.K. achieved the 600?C level of steam conditions for the Electric Power Development Co., Ltd. (EPDC) in 19972) at the No.

2 unit of the MatsuuraThermal Power Station and for the Tohoku Electric Power Co., Inc. in

1998 at the No.

2 unit of the HaramachiThermal Power Station3). The EPDC has been paying particular attention to environmental issues and decided to apply an advanced steam condition, 25.0 MPa/600?C/610?C, to the No.

2 boiler at Tachibana-Wan (see Fig. 2). This 3,000 t/h coal-fired boiler was supplied by Babcock-Hitachi K.K.. Table

1 gives the principal specifications of the boiler. This plant successfully entered commercial operation in December

2000 and its advanced steam conditions represent the highest level in Japan. This Fig. 1― Improvements in Steam Conditions of Babcock-Hitachi Boilers. In recent years, steam conditions of coal-fired boilers in Japan have dramatically improved. Tachibana-Wan No.

2 (1,050 MW) 25.0 MPa/600/610?C

1985 1990

1995 2000

2005 Year

2010 24.5 MPa/600/600?C 24.1 MPa/593/593?C 24.1 MPa/566/593?C 24.1 MPa/538/566?C Haramachi No.

2 (1,000 MW) Matsuura No.

2 (1,000 MW) Nanao-Ohta No.

1 (500 MW) Shinchi No.

1 (1,000 MW) Noshiro No.

1 (600 MW) Hekinan No.

2 (700 MW) Matsuura No.

1 (1,000 MW) Hitachi Review Vol.

50 (2001), No.

3 101 article describes the main design features of the No.

2 boiler at Tachibana-Wan, highlighting the use of the advanced steam temperature of 600/610?C. MAIN DESIGN FEATURES OF THE BOILER Fig.

3 is a cross-sectional schematic view of the Tachibana-Wan No.

2 boiler.As this is a medium-load plant burning coals with a wide range of grades, various factors were considered in designing the boiler for sliding-pressure operation with advanced steam parameters. To achieve high steam temperatures, the numbers of superheaters and reheaters are marginally greater than would conventionally be used. However, the increase in the heating surfaces is kept to a minimum by optimizing the furnace in terms of combustion performance and the slagging potential of the coals the furnace is designed to use, so that the boiler'