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Pang K.-L.,Nanjing Southeast University | Pang K.-L.,National Power Plant Combustion Engineering Research Center | Xiang W.-G.,Nanjing Southeast University | Zhao C.-S.,Nanjing Southeast University | Li Z.-Z.,National Power Plant Combustion Engineering Research Center
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2010

Gasification characteristics of natural coke in Peicheng mine with CO2 are investigated with thermogravimetric apparatus. The gasification characteristic differences between natural coke and its raw coal are compared at different temperatures. The effects of gasification temperature, flow rate of gasification media and operating pressure in the gasification process of natural coke are examined. The results show that the gasification characteristics of the Peicheng natural coke are approximate to those of its raw coal, only slightly higher than those of the raw coal. The gasification temperature has significant influences on gasification properties. When the gasification temperature is at 1000°C, sample weight of natural coke is about 10 mg at atmosphere pressure. The influnence of diffusion is almost eliminated when flow rate of gas is up to 60 mL/min in gasification. As the pyrolysis pressure increases, the gasification reaction rate increases and the carbon conversion rate also gets increased, but it increases nonlinearly. The pressure has weak influences on reductive reaction of natural coke-CO2 at high pressure. Source


Chen X.-L.,Harbin Institute of Technology | Wu S.-H.,Harbin Institute of Technology | Li Z.-Z.,National Power Plant Combustion Engineering Research Center | Wang Y.,National Power Plant Combustion Engineering Research Center | And 3 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2010

Off-design characteristics of gas turbine in a 200 MW integrated gasification combined cycle (IGCC) system was studied based on system model built with ThermoFlex software from the system point of view. Influence of gas turbine load, air separation unit (ASU) integrated coefficient (Xas), nitrogen reinjection coefficient (Xgn) and atmospheric conditions on the system performance was analyzed in detail under three adjusting modes. Results show that when the compressor inlet guide vane (IGV) is kept at a constant angle, both the gas turbine inlet temperature (T3) and exhaust temperature (T4) will drop with the reduction of gas turbine load. Under conditions that IGV is adjusted and gas turbine load reduced, if T3 is kept constant, T4 will first rise and then decrease, with the turning point at about 80% load; whereas if T4 is kept constant, T3 will first slowly and then quickly reduce, with the turning point at about 70%. Under the adjusting mode of keeping T3 constant, the adjustable degree of IGV angle is smaller than that of keeping T4 constant. Off-design performance of the system under IGV adjustable condition is better than IGV fixed condition. When atmospheric temperatures climb, both the gas turbine and the system power will reduce, and in the case of Xas = 0.3, above two powers will rise with growing Xgn. Source


Liu Y.-X.,Harbin Institute of Technology | Liu Y.-X.,Shenyang Aerospace University | Wu S.-H.,Harbin Institute of Technology | Li Z.-Z.,National Power Plant Combustion Engineering Research Center | And 2 more authors.
Dongli Gongcheng Xuebao/Journal of Chinese Society of Power Engineering | Year: 2012

Using software ThermoFlex, a model of 200 MW IGCC system was established based on two-stage coal-slurry gasification technology, so as to study the effects of following factors on performance of the IGCC system, such as the gasification temperature, coal-slurry concentration, gasification pressure and purity of oxygen, etc. Results show that both the gross and net efficiency of power generation decrease with rising gasification temperature and pressure; higher net efficiency is to be obtained at a flow of higher purity oxgen; raising coal supply ratio (γ sc) at the second stage may help to improve the system performance under same conditions of gasification temperature (or purity of oxygen, or gasification pressure). Whereas under the varying conditions of coal-slurry concentration, the designed value of carbon conversion can be achieved based on adjustment of oxygen-coal mass ratio along with the variation of γ sc. Source

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