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Li J.,Technology Development Service Center | Li B.,North China Electrical Power University | Yao G.,Technology Development Service Center | Kou J.,Inner Mongolia Power Exploration and Design Institute | And 5 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

In order to improve the power supply efficiency of the thermal power plants, a system coupling of gas turbine and boiler was proposed, and a performance model of the coupled system was established. The prediction shows that the performance of the system is influenced significantly by the temperature of exhaust gas. At temperature of exhaust gas of 130°C, the thermal efficiency of the coupled system improves, and the coal consumption of the system reduces correspondingly. At certain maximum operating temperature of gas turbine, the ratio of the total air volume into the boiler and the air volume into gas turbine has an optimum value. The efficiency of the coupling system could improve more than 0.5% when the maximum operating temperature of gas turbine is 700°C, the increasing of power supply could be up to 4% at the same operating temperature of gas turbine. Taking into account of the unit thermal efficiency, cold end corrosion and the other factors, the best increasing of power supply is 1.64% by deleting the power consumption of fan. At same condition, the optimum ratio of the total air volume into boiler and the air volume into the gas turbine is about 4.29. © 2012 Chinese Society for Electrical Engineering. Source


Li J.,Technology Development Service Center | Li B.,Technology Development Service Center | Li B.,North China Electrical Power University | Lu J.,Tsinghua University
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | Year: 2012

Reducing power consumption rate is effective way to increase the system efficiency of thermal power generating units, in currently, people often using a small turbine to drive feed water pump or fan to reduce the power consumption rate or using converter technique. A new technology program is proposed in order to reduce the power consumption rate, by transplanting turbofan engine technology to power plant, through using the high temperature heat exchanger replaced the combustion chamber of gas turbine to heat high-pressure air flowed from the compressor, so the high temperature and pressure air flowing into turbine and then discharging to boiler after expensing and working in turbine. In addition to drive the compressor, turbine generating surplus power can be used to replace part of the auxiliary power or drive electrical equipments. The computational model of the performance of the technology program was established and the calculation results show that when the temperature of the air at the inlet of the turbine is 700°C, at the condition of the boiler without increasing the exhaust gas temperature, in addition to providing the boiler wind power consumption, air turbine system can also generating more than 9 MW of electrical power, conversion decreased plant electricity rate about 3% for the 600 MW thermal power unit. The effect of reducing power consumption rate through air system and small steam turbine are compared and the results show that the new technology program better than using a small turbine to reduce the auxiliary power mode. Source


Li B.,North China Electrical Power University | Li J.,Technology Development Service Center | Zhang Q.,Technology Development Service Center | Kou J.,Inner Mongolia Power Exploration and Design Institute | And 5 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

Based on the technologies of fanjets and externally-fired gas turbines, a system coupled by a gas turbine and a boiler was proposed. In the new system, most of the air is driven by the front fan of the gas turbine and flows into a boiler as primary and secondary air of the boiler; and the air compressed by a compressor of the gas turbine flows into the high temperature heat exchanger (HTHE) installed in the furnace chamber to absorb the heat and to work through expanding in the turbine. At last, the air would flow into the chamber as secondary air when it is discharged from the turbine. The compressor and the front fan are driven by the turbine. The thermal model of the system was established. The results of calculation show that the technology of using a gas turbine to drive the fan of the boiler is feasible. The auxiliary power consumption rate will be reduced obviously, because primary and secondary air fans can be replaced by the proposed system. © 2012 Chin. Soc. for Elec. Eng. Source

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