National Power Plant Combustion Research Center

Liaoning, China

National Power Plant Combustion Research Center

Liaoning, China
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Chen X.-L.,Harbin Institute of Technology | Wu S.-H.,Harbin Institute of Technology | Li Z.-Z.,National Power Plant Combustion Research Center | Wang Y.,National Power Plant Combustion Research Center | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

The model of 200 MW integrated gasification combined cycle (IGCC) system was established by the software "ThermoFlex". The off-design characteristics of three-pressure with reheat bottom cycle system in IGCC were studied and effects of gas turbine's load, atmosphere temperature and air separation unit (ASU) integrated coefficient on characteristics of bottom cycle system were fully discussed. Results show that while in regulation manner of adjusting compressor inlet guide vanes (IGV) angle and keeping turbine inlet temperature (T3) constant to reduce gas turbine's load, main steam temperature and reheat steam temperature are firstly increased and then declined. Closing IGV angle can restrain pressure of high-pressure vapor-bag decline, and make exhaust steam dryness of low-pressure steam turbine rise, so this is beneficial to improve off-design characteristics of bottom cycle system. As atmosphere temperature increasing, pressure of high-pressure vapor-bag, steam flow inlet high-pressure cylinder and power of bottom cycle system all decline, but main steam temperature and exhaust steam dryness of low-pressure cylinder in steam turbine increase. Decreasing Xas can greatly enhance power of bottom cycle system, but slowly reduce exhaust steam dryness of low-pressure cylinder in steam turbine. © 2010 Chin. Soc. for Elec. Eng.


Liu Y.,Harbin Institute of Technology | Wu S.,Harbin Institute of Technology | Li Z.,National Power Plant Combustion Research Center | Wang Y.,National Power Plant Combustion Research Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The integrated gasification combined cycle system (IGCC) is often operated at off-design condition. In order to learn the off-design characteristics of IGCC, the software ThermoFlex was used to establish the model of a 200 MW integrated gasification combined cycle (IGCC) system based on the two-stage coal-slurry gasification technology. The effects of gas turbine load, air separation unit integrated coefficient (X as), atmosphere temperature and atmosphere pressure on the performance of IGCC system were investigated. The results show that gross and net electric efficiency increases at first and then decreases with atmosphere temperature increasing or gas turbine load decreasing. The gross electric efficiency decreases when the air separation unit integrated coefficient increases. Atmosphere pressure has little effect on system efficiency. The application of two-stage coal-slurry gasification technology has good availability to improve IGCC system performance under the above running conditions. The results will provide reference for design and operation of the IGCC power plant. © 2012 Chinese Society for Electrical Engineering.


Liu Y.,Harbin Institute of Technology | Wu S.,Harbin Institute of Technology | Li Z.,National Power Plant Combustion Research Center | Wang Y.,National Power Plant Combustion Research Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The air separation unit(ASU) is a key unit of the integrated gasification combined cycle(IGCC) system. For optimizing the ASU operation parameters which can directly influence the whole system performance, the software ThermoFlex was used to establish the model of a 200 MW level IGCC system. The effects of nitrogen re-injection coefficient(X gn), air separation unit integrated coefficient(X as), oxygen concentration and re-injection nitrogen temperature(T rn) on the performance of IGCC system were investigated based on different operation pressure of the ASU(p asu). The results show that the gross and net electric efficiency increases at first and then decreases with X gn increasing. As p asu increasing, the system efficiency decreases. The net electric efficiency increases with X as. The higher p asu is, the higher net electric efficiency is obtained when X as is more than 60%. The oxygen concentration has little effect on system efficiency. Through T rn increasing, the system performance can be improved. The net electric efficiency increases with p asu when the oxygen concentration(or T rn) keep unchanged. The research results provide reference for design of the IGCC power plant. © 2012 Chinese Society for Electrical Engineering.


Chen X.,Harbin Institute of Technology | Zhang D.,China Huadian Corporation | Wu S.,Harbin Institute of Technology | Li Z.,National Power Plant Combustion Research Center | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

It is one of keystones to research on integrated gasification combined cycle (IGCC) system that solving gas turbine flow problem and determining the optimal operation condition of the gas turbine burning fuels with medium and low heat value fuel. A 200 MW IGCC unit was researched, and three regulation schemes of gas turbine were prsented from the view of system. The effects of these regulation schemes on the characteristics of the gas turbine and the performance of IGCC system were given. The results show that reducing the compressor inlet airflow or increasing turbine flow area within limits can improve the characteristic of the gas turbine burning low-value syngas and the performance of the IGCC system. Rationally arranging air separation unit (ASU) integrated coefficient (Xas) and nitrogen reinjecting coefficient (Xgn) can increase efficiency of the IGCC system. The parameters of these three regulation schemes all have optimal values which can make the gas turbine and IGCC system have the largest power and efficiency. The results of the research can help to confirm optimal operation condition of gas turbine burning low-heat-value syngas and can also provide convenience for the design and operation of IGCC power plant. ©2011 Chin. Soc. for Elec. Eng.

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