Urbanization, Energy, and Air Pollution in China The Challenges Ahead: Proceedings of a Symposium (2004) / Chapter Skim
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Development of Clean-Coal Technology--HONGGUANG JIN, RUIXIAN CAI, and BAOQUN WANG
Development of Clean-Coal Technology--HONGGUANG JIN, RUIXIAN CAI, and BAOQUN WANG
Pages 237-250
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From page 237... ...
But controlling CO2 emissions and mitigating their greenhouse effect is still one of the most serious environmental challenges facing China, as well as the rest of the world. Up to now, there have been three main approaches to controlling greenhouse gas emissions: (1)
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From page 238... ...
China is beginning to carry out research on IGCC techniques, including gasification, gas purification, gas turbines, and heat-recovery systems, and is considering establishing its first 300400 megawatt (MW) IGCC demonstration plant in Yantai.
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. A chemical-absorption method using amine solvents, such as mono ethanol amine (MEA)
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improving absorption solvents and equipment, and many solvents with low energy consumption and low corrosion rates have been tested and evaluated. The combination of CO2 separation and clean-energy generation in the IGCC system would provide clean, efficient coal consumption and would greatly reduce the amount of energy consumed during CO2 separation.
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241 = S turbine. exchanger.
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In the internal-fired gas-turbine cycle, the raw coal gas is combusted with O2, and the thermal energy released is used to heat the combustion-gas stream (mainly water vapor) , thus maintaining a high cycle efficiency.
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For example, in a traditional power-generating system, contaminations are separated downstream of the system, an energy-intensive process. In the polygeneration system, the reaction and separation are accomplished in one process; thus, chemical production and power generation form a chain.
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From page 244... ...
divided into two parts: one part that enters the shift-reaction unit and one that serves as regulating gas. Unlike conventional methanol synthesis, which recycles unconverted gas to increase the methanol conversion rate, the polygeneration system controls methanol synthesis by adjusting the flow rate ratio of the shifted gas to the regulation gas and sends the unconverted-gas stream to the power island as fuel.
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From page 245... ...
But for the time being, the power and electricity industry is focusing on the development of a supercritical-steam turbine. Compared with this system, the polygeneration system may require a higher initial investment because polygeneration is a complex system that combines several advanced technologies, including gasification, gas turbines, and high-temperature gas cleanup.
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By taking advantage of these advanced technologies, the energy network can achieve high efficiency and save resources. Second, the system should contribute to CO2 capture technology because the energy network can capture CO2 without the energy penalty associated with current systems.
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Clean synthetic fuels can be used as fuels in com bined cycles. Most clean synthetic fuels are organic; the combustion products are CO2 and H2O, and the CO2 can be easily recovered by condensing the water vapor.
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In addition, producing methanol from coal will probably increase the use of natural gas, which currently accounts for less than 3 percent of energy consumption in China. In conclusion, an integrated energy network would simultaneously save energy and control greenhouse gas emissions in China.
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2003. A Chemically Intercooled Gas Turbine Cycle for Recovery of Low-Temperature Thermal Energy.
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