Scientific and Technical Service Center

Haidian District, China

Scientific and Technical Service Center

Haidian District, China
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Liu J.,Shenyang Institute of Engineering | Liu J.,Tsinghua University | Li Z.,Tsinghua University | Li J.,Tsinghua University | And 3 more authors.
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011 - Proceedings | Year: 2011

In the process of air blower design, splitter blades could be adopted in the middle of rotator to improve the air blower performance. In order to understand the flow pattern in the high-pressure centrifugal blower of 9-26 type with splitter blade thoroughly, the three dimensional air flows in the air blower is numerically simulated and analyzed with computational fluid dynamics. Standard k- turbulence model and unstructured grids are applied in computation. The calculating results showed that for the same condition, the flux of the air blower was improved more than 5% and the total pressure at outlet of the air blower was improved more than 10% due to the splitter blade. It is found that the length of the splitter blade affected the flow rate either and there is an optimum length. Compared with the air blower without the splitter blade, the velocity and the pressure distribution in the air blower impeller channel are quite different after installing the splitter blade. When installing the splitter blades, its structure should be carefully considered. © 2011 IEEE.


Liu J.,Shenyang Institute of Engineering | Li J.,Tsinghua University | Hao Z.,Tsinghua University | Yang H.,Tsinghua University | And 2 more authors.
ICMREE 2013 - Proceedings: 2013 International Conference on Materials for Renewable Energy and Environment | Year: 2013

Experiment on co-combustion of crop stalk and coal is carried out in a 260t/h CFB boiler, and the performance of the CFB boiler is tested under 4 mixing ratios of crop stalk to coal, 0%, 10%, 20% and 30%. The results show that under the 4 mixing ratios, the CFB boiler could run safely and stably with 85% MCR and the boiler thermal efficiency is almost the same. With the increase of mixing ratio, the amount of ash entering the boiler decreases accordingly. In order to meet the need for furnace ash, boiler drains ratio shall be reduced accordingly. With the increase of mixing ratio, the CO content in flue gas at the furnace outlet increases sharply from 98 ∼ 310 ppm, and the flue gas temperature at furnace outlet also increases, while emissions of SO2 decrease apparently. © 2013 IEEE.


Li J.-F.,Scientific and Technical Service Center | Lu J.-F.,Tsinghua University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

It was suggested to erection the chimney power in the water cooling tower of the thermal power plant to recover the waste heat and water. And this chimney power system was analyzed thermodynamically. The predictions show that chimney power not only could generate eclectic power with the waste heat, but also could retrieve water through steam-water separator and recovery equipment at the top of the tower. It is found that within a limited range of height and turbine inlet temperature at the bottom, the tower thermal efficiency increases with the increasing of tower height, reaching a peak. For the 2×600 MW and 2×1000 MW power plant units, the chimney power could provide 25.11 MWe and 37.28 MW electric power respectively, for the tower height of 2000 m, environmental temperature of 15° and turbine inlet temperature of 25°. In the same time, 37.21% water evaporated at the bottom of the tower is recovered, about 6.48×106 t per year and 9.62×106 t per year respectively. © 2010 Chin. Soc. for Elec. Eng.


Li J.-F.,Scientific and Technical Service Center | Lu J.-F.,Tsinghua University | Li B.,Scientific and Technical Service Center | Li B.,North China Electrical Power University | And 4 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2011

In order to improve the efficiency of thermal power unit, a calculation model was established for the system coupling gas turbine and CFB boiler that applies multi-compression, inter-cooling, multi-expansion and inter-reheat technology, with which the system performance was calculated. Analysis results show that the thermal efficiency of the system will arrive at a maximum value with the rise of both the stage number of compressor and the inlet pressure of turbine. Meanwhile, the thermal efficiency rises all the time and will reach about 46% as the turbine inlet temperature improves and the turbine stage number increases. The new system has the features of higher thermal efficiency and lower self-service power consumption. Taking into account the structural complexity and comprehensive economy of the system, both the compressor and turbine are recommended to adopt 3 stages.


Li J.-F.,Scientific and Technical Service Center | Lu J.-F.,Tsinghua University | Li B.,Scientific and Technical Service Center | Li B.,North China Electrical Power University
Ranshao Kexue Yu Jishu/Journal of Combustion Science and Technology | Year: 2011

In order to improve the heat energy efficiency of hot slag, the thermal-efficiency and exergy-efficiency calculation models of two types of ash cooling equipment of a 300 MW circulating fluidized bed boiler were established and their performance was calculated. The results show that the two types of cooling equipment differ great in thermal-efficiency and exergy-efficiency, and that their thermal-efficiency is obviously higher than their exergyefficiency. So to develop ash cooling equipment with a large scale and a high efficiency is essential for energy-saving of a large-scale CFB boiler.


Li Z.,Shenhua Group Coltd | Zhang D.L.,Tsinghua University | Li J.F.,Scientific and Technical Service Center | Yang D.H.,Shenhua Group Coltd | And 4 more authors.
Advanced Materials Research | Year: 2014

Based on polytrophic process of air compression and gas combustion inside the turbine isothermally, an approximate gas-turbine with General Carnot cycle and relevant implementing schemes are suggested. Its performance was predicted with mathematics model compared with traditional one. The results show that the heat efficiency of the suggested gas turbine is higher than the traditional one. The suggested cycle combines the gas cycle and steam cycle, of which the NOx emission can be easily decreased. © (2014) Trans Tech Publications, Switzerland.


Wang X.L.,Shenhua Group Coltd | Yang D.H.,Shenhua Group Coltd | Yang G.S.,Shenhua Group Coltd | Li Z.,Shenhua Group Coltd | And 2 more authors.
Advanced Materials Research | Year: 2013

In the process of fan's design, splitter blades could be adopted in the middle of rotator to improve the performance of fan. In order to understand the flow pattern in the high-pressure centrifugal blower of 9-26type with splitter blade thoroughly, computational fluid dynamics Fluent is applied and the three dimensional air flows in the fan is numerically simulated and analyzed. The calculating results showed that under the same condition, the flux of the fan was improved 5%approximately and the mean total pressure at outlet of the fan was improved 10% because of the splitter blade, the length of the splitter blade affected the flux either. Standard k -ε turbulent model and unstructured grids are applied in computation. The results of calculation can good helpful for people to improve the performance of the fan. © (2013) Trans Tech Publications, Switzerland.


Li J.-F.,Scientific and Technical Service Center | Lu J.-F.,Tsinghua University
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2010

Through analyzed performance of fanjet adopted technology of combustion inside turbine, the results showed that the thermal-efficiency and the thrust of the fanjet were both increased after technology of combustion inside turbine being used. Two technical schemes of combustion inside turbine were analyzed similarly, the fuel nozzles were installed in stationary blades was a sort of schemes and the turbine as a big combustion chamber was the other one, the former one belongs to the technology of multilevel combustion and the latter belongs to high-temperature air combustion technology.

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