Optimization of Flow Matching Schemes for a Heavy Gas Turbine Burning Syngas
- PDF / 1,098,692 Bytes
- 8 Pages / 595.22 x 842 pts (A4) Page_size
- 7 Downloads / 206 Views
https://doi.org/10.1007/s11630-020-1359-2
Article ID: 1003-2169(2020)00-0000-00
Optimization of Flow Matching Schemes for a Heavy Gas Turbine Burning Syngas GUO Lei, LI Guoqing, HU Chunyan*, LEI Zhijun, HUANG Enliang, GONG Jianbo, XU Gang Key Laboratory of Light-duty Gas-turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: A heavy-duty gas turbine, designed for natural gas, was used to burn the syngas with two different calorific values. This study was mainly to optimize the flow matching scheme for the gas turbine. Two models of gas turbine burning syngas with different calorific values were established and the calculation models of different flow matching schemes were provided. The optimum scheme was obtained by evaluating thermal efficiency and work output under different operating conditions. The results showed that the highest unit efficiency was achieved by, without significant drop in work output, increasing the throat area of the turbine nozzle and reducing the initial temperature of the gas. On the premise of ensuring the safety of the gas turbine unit, increasing the pressure ratio of the compressor could further improve the unit efficiency and the work output. Simply adjusting the angle of the inlet guide vane fails to match the flow of compressor and turbine. The measures such as reducing inlet temperature of turbine or air bleed still need to be adopted, but the thermal efficiency dropped significantly in this process.
Keywords: gas turbine, flow matching, syngas
1. Introduction Coal has the largest reserves among fossil fuels. Therefore, as one of efficient and clean coal utilization technology, Integrated Coal Gasification Combined Cycle (IGCC) has been paid more and more attention [1‒3]. A challenging problem arising from the integration of gas turbine burning standard natural gas into IGCC system is that the performance of gas turbine has changed due to the conversion of fuel from natural gas to syngas [4‒6]. Since the Low Heating Value (LHV) of syngas is much lower than that of natural gas, more syngas is required in the combustion system, which leads to the imbalance of the flow between compressor and
Received: Dec 01, 2019
AE:ZUNINO Pietro
turbine [7, 8]. The higher inlet pressure of turbine should be required to obtain a larger gas flow rate, which perhaps leads to the risk of encountering compressor instability and insufficient cooling of turbine blades. If the different air separation schemes or the different reinjection volume of N2 is used in the IGCC system, the operation conditions of gas turbine will be more complicated [9, 10]. In order to ensure the safe and efficient operation of gas turbines, measures, such as increasing the throat area of turbine nozzle, reducing the turbine inlet temperature, cutting off the top of compressor blade, adjusting the compressor inlet guide vane (IGV) angle or air bleed
Data Loading...
