Energy and Exergy Analysis on China’s Natural Gas Urban District Heating Systems for Replacing Coal: A Case Study of Beijing

  • Bo Wu Mechanical Engineering of the University of Science and Technology Beijing.
  • Li Wang School of Mechanical Engineering of the University of Science and Technology Beijing
Keywords: CHP, urban district heating, distributed energy system, heat pump heating, exergy efficiency, combined cycle

Abstract

China has been vigorously developing natural gas-based urban district heating (UDH) for years to reduce air pollution. Various UDH systems are proposed for a case in the urban area of Beijing. This study investigates the effects of load percentages of different prime movers on the technical performances of several UDH systems at different ambient temperatures. A decrease in the gas turbine load percentage results in an obvious decrease in the exergy efficiency of the UDH system. The calculation results of heating and power outputs, energy and exergy inputs, and exergy efficiency of the UDH systems under different working conditions are presented. The heating association of distributed energy system and on-demand heat pump heating can reach the highest average-exergy-efficiency among the UDH systems. This optimal natural gas-based UDH system should be promoted in China instead of natural gas-fired heating boilers to replace coal-based UDH.

Downloads

Download data is not yet available.

Author Biographies

Bo Wu, Mechanical Engineering of the University of Science and Technology Beijing.

Bo Wu has been a PhD student at the School of Mechanical Engineering of the University of Science and Technology Beijing. His research activity focuses on the integration and optimization of distributed energy systems. Email: wubonet@163.com.

Li Wang, School of Mechanical Engineering of the University of Science and Technology Beijing

Li Wang is a professor and dean at the School of Mechanical Engineering of the University of Science and Technology Beijing. Research activity concerned energy conversion and utilization, energy saving and emission reduction etc. Corresponding Author: E-mail: liwang@me.ustb.edu.cn; phone: +86-10-62334425; fax: +86-10-62329145.

References

Akorede M.F., Hizam H.H., Pouresmaeil E. Distributed energy resources and benefits to the environment. Renewable and Sustainable Energy Reviews 2010, 14(2): 724-734.

Lozano M.A., Ramos J. Thermodynamic and economic analysis for simple cogeneration systems. Cogeneration & Distributed Generation Journal 2010, 25(3): 63-80.

Hughes B.R., Chaudhry H.N., Ghani S.A. A review of sustainable cooling technologies in buildings. Renewable and Sustainable Energy Reviews 2011, 15(6): 3112-3120.

Bartusch C., Odlare M., Wallin F., Wester L. Exploring variance in residential electricity consumption: Household features and building properties. Applied Energy 2012, 92:637-643.

Kong X.F., Lu S.L., Wu Y. A review of building energy efficiency in China during “Eleventh Five-Year Plan” period. Energy Policy 2012, 41:624-635.

Wang L., Chen X., Wang L., Sun S.F., Tong L.G., Yue X.F. Contribution from Urban Heating to China’s 2020 Goal of Emission Reduction. Environmental Science & Technology 2011, 45 (11): 4676-4681.

Su S.S., Li B.G., Cui, S.Y., Tao, S. Sulfur Dioxide Emissions from Combustion in China: From 1990 to 2007. Environmental Science & Technology 2011, 45 (19): 8403-8410.

Klimont Z., Cofala, J., Xing, J., et al. Projections of SO2, NOx and carbonaceous aerosols emissions in Asia, Tellus B. 2009, 61, 602-617.

Cheng M.C., You C.F., Cao J., Zhang J. Spatial and seasonal variability of water-soluble ions in PM2.5 aerosols in 14 major cities in China. Atmospheric Environment 2012, 60: 182-192.

Cao J.J., Wang Q.Y., Chow J.C., Watson J.G., Tie X.X. Impacts of aerosol compositions on visibility impairment in Xi’an, China. Atmospheric Environment 2012, 59: 559-566.

China to Reduce Sulfur Dioxide Emissions.http://english.peopledaily.com.cn/200203/20/eng20020320_92414.shtml.

China National Energy Administration. Beijing accomplished eliminating coal-based heating services within the second ring road. http://www.nea.gov.cn/2012-01/05/c_131342315.htm.

Project of replacing coal-fired boiler with natural gas-fired boiler has been finished within the second ring road in Shijiazhuang. www.hebei.gov.cn/article/20100319/1417951.htm.

Kamate S.C., Gangavati P.B. Exergetic comparison of bagasse-based cogeneration plants. Distributed Generation & Alternative Energy Journal 2011; 26(3): 20-35.

Hepbasli A. Low exergy (LowEx) heating and cooling systems for sustainable buildings and societies. Renewable and Sustainable Energy Reviews 2012, 16(1): 73-104.

Kilkis B. Exergy aspects of operative temperature and its implications on sustainable building performance. Raising efficiency to new levels, New Mexico. ASHRAE Transactions 2010, July.

Hepbasli A. A comparative investigation of various greenhouse heating options using exergy analysis method. Applied Energy 2011, 88 (12), 4411–4423.

Buoro D., Casisi M., Pinamonti P., Reini M. Optimization of distributed trigeneration systems integrated with heating and cooling micro-grids. Distributed Generation & Alternative Energy Journal 2011, 26(2): 7-34.

China National Development and Reform Commission, China National Energy Administration. Guidance on the development of natural gas distributed energy. http://www.gov.cn/gzdt/2011-10/13/content_1968820.htm.

Gnanapragasam, N.V., Reddy B.V., Rosen M.A. Optimum conditions for a natural gas combined cycle power generation system based on available oxygen when using biomass as supplementary fuel. Energy 2009, 34 (6), 816–826.

National Bureau of Statistics of China. China Statistical Yearbook, China Statistics Press: Beijing, China, 2012.

Thermoflow Inc. GT Pro & GT Master, ST Pro & ST Master Ver. 21, 2011.

China National Development and Reform Commission. Guidance on the development of combined heating and power. http://www.ndrc.gov.cn/zcfb/zcfbtz/2011tz/t20111013_438374.htm.

Ahmadi P., Dincer I., Rosen M.A. Exergy, exergoeconomic and environmental analyses and evolutionary algorithm based multi-objective optimization of combined cycle power plants. Energy 2011, 36 (10), 5886-5898.

Climatic Data Center of Meteorological Information Center of Chinese Meteorological Administration, Department of Building Science of Tsinghua University. China-specific meteorological data sets on analysis of the construction thermal environment, China Architecture and Building Press: Beijing, China, 2005.

Dave N., Do T., Palfreyman D. Post-combustion capture of CO2 from coal-fired power plants in China and Australia: An experience based cost comparison. Energy Procedia 2011, 1869-1877.

Published
2014-01-01
Section
Articles