Performance improvement of gaseous hydrocarbon fuel driven thermal power generation systems for hypersonic vehicles

2019 ◽  
Vol 199 ◽  
pp. 111949
Author(s):  
Haowei Li ◽  
Jiang Qin ◽  
Wen Bao ◽  
Hongyan Huang
Keyword(s):  
Power Generation ◽  
Performance Improvement ◽  
Thermal Power ◽  
Hydrocarbon Fuel ◽  
Hypersonic Vehicles ◽  
Gaseous Hydrocarbon ◽  
Thermal Power Generation ◽  
Power Generation Systems

Dynamic Simulation of Startup Characteristics for the Advanced Humid Air Turbine System

2017 ◽  
Author(s):  
Yutaka Watanabe ◽  
Toru Takahashi ◽  
Masashi Nakamoto
Keyword(s):  
Power Generation ◽  
Dynamic Model ◽  
Dynamic Simulation ◽  
Thermal Power ◽  
Load Ratio ◽  
Operational Flexibility ◽  
Characteristics Analysis ◽  
Thermal Power Generation ◽  
Power Generation Systems ◽  
Operational Data

Thermal power generation systems have played an important role to adjust power supply and demand balance in power grid due to the high operational flexibility. It is required for next future thermal power generation systems to have higher thermal efficiency and operational flexibility, not only to reduce CO2 emission but also to cope with the increase of electricity generation by renewable energy sources which are changeable depending on the weather. The Advanced Humid Air Gas Turbine (AHAT) system is expected to meet these requirements and now proceeding with the development by Mitsubishi Hitachi Power Systems Ltd., Central Research Institute of Electric Power Industry (CRIEPI) and Sumitomo Precision Products Co., Ltd. So far, the system concept and cycle performance of the AHAT system were verified by operational tests of a 3MW-class pilot plant and a 40MW-class test facility. However, the characteristics of operational flexibility, such as load following capability and fast startup speed, have not been clarified sufficiently. It is considered that dynamic characteristics analysis is useful to evaluate and improve operational flexibility. On the other hand, CRIEPI is now developing the dynamic analysis tool for thermal power generation systems based on Modelica language using Dymola, in the aim of evaluating operational characteristics of both a new thermal power system and existing thermal power plant. The component models of this tool are basically developed based on mass and energy conservation equations. In this paper, we try to construct the dynamic model using this tool for the startup characteristics analysis and to investigate the possibility of shortening startup speed of AHAT system. First, the validity of the dynamic model of AHAT system was verified compared with the 3MW-class pilot plant operational data. As a result, the simulation result agrees almost well with the operational data and the validity of this dynamic model was confirmed. And next, the startup characteristics in the case of increasing startup load ratio by dynamic simulation were investigated. The simulation result show that it is difficult to achieve the rated power output only by changing startup load ratio because the humidification rate of humidification tower is rate-limiting and the gas turbine exhaust gas temperature reaches the limit value before achieving the rated power output. And it is found that the effects of the water valve operational speed of humidification tower and of the heat capacity of the recuperator are important to shorten the startup time of AHAT system.

Thermodynamic performance evaluation of solar and other thermal power generation systems: A review

2015 ◽  
Vol 50 ◽  
pp. 567-582 ◽  
Author(s):  
M.K. Gupta ◽  
S.C. Kaushik ◽  
K.R. Ranjan ◽  
N.L. Panwar ◽  
V. Siva Reddy ◽  
...  
Keyword(s):  
Power Generation ◽  
Performance Evaluation ◽  
Thermal Power ◽  
Thermodynamic Performance ◽  
Thermal Power Generation ◽  
Power Generation Systems

scholarly journals Dynamic Thermo-physical Characteristics of High Temperature Gaseous Hydrocarbon Fuel Thermal Power Generation for Regeneratively Cooled Hypersonic Propulsion System

2019 ◽  
Author(s):  
Qing Xu ◽  
Haowei Li ◽  
Yaoxun Feng ◽  
Xiaoning Li ◽  
Changming Lin ◽  
...  
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Working Conditions ◽  
Thermal Power ◽  
Hydrocarbon Fuel ◽  
Physical Characteristics ◽  
Propulsion System ◽  
Gaseous Hydrocarbon ◽  
Air Breathing ◽  
Hypersonic Propulsion

The aspirated hypersonic air-breathing propulsion system requires a large amount of power generation, but its special structure makes it impossible to adopt common power generation methods. The high-temperature gaseous hydrocarbon fuel thermal power generation (TPG) system was developed to solve the power generation problem for hypersonic air-breathing propulsion system. But off-design operating conditions of the hypersonic propulsion system results in a more complex process for both propulsion system and the TPG system. To better analyzing the dynamic thermos-physical characteristics of hypersonic airbreathing propulsion system considering thermal-mechanical coupling process among cooling/TPG system, a dynamic analytical model was developed, and the dynamic thermos-physical characteristics of TPG system under different off-design working conditions were conducted. It can be concluded from the analytical results that the dynamic process of thermos-physical characteristics shows a complex trend under the flight Mach number and fuel equivalence ratio off-design working conditions. Such complexity of dynamic characteristics brings difficulties in fuel supply for the propulsion system.

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