scholarly journals Simulation of the HiPowAR power generation system for steam-nitrogen expansion after ammonia oxidation in a high-pressure oxygen membrane reactor

2021 ◽  
Vol 312 ◽  
pp. 08016
Author(s):  
Alberto Cammarata ◽  
Paolo Colbertaldo ◽  
Stefano Campanari
Keyword(s):  
Power Generation ◽  
High Pressure ◽  
High Temperature ◽  
Gas Turbines ◽  
Membrane Reactor ◽  
Pure Oxygen ◽  
Inlet Temperature ◽  
Generation System ◽  
Power Generation System ◽  
Very High

The EU project HiPowAR studies a novel power generation system based on ammonia flameless oxidation with pure oxygen in a high-pressure membrane reactor and expansion of the resulting high-temperature H2O-N2 stream. The system combines the advantages of high temperature at expander inlet, typical of gas turbines, and small compression demand, typical of steam cycles. Water is injected into the reactor to control the very high adiabatic temperature, at the limited energy expenditure of liquid pumping. This work assesses the performance potential of the HiPowAR system under different design conditions, through simulations with a model developed in Aspen Plus®. The system shows a high efficiency (up to 55%) when operating at high temperature (e.g., 1350°C at expander inlet); hence, O2 membranes capable of working at very high temperature are required. The cycle features an optimal sub-atmospheric expansion pressure (in the range 0.1-0.2 bar), which requires the re-pressurization of the off-gas (steam-saturated nitrogen). The system also produces liquid water as a net output. A reduction of the expander inlet temperature to values acceptable by typical steam cycles (600°C) significantly limits the efficiency, despite allowing to demonstrate the process using conventional steam expanders.

Dynamic Performance of Power Generation Systems for Off-Shore Oil and Gas Platforms

2014 ◽  
Author(s):  
Leonardo Pierobon ◽  
Krishna Iyengar ◽  
Peter Breuhaus ◽  
Rambabu Kandepu ◽  
Fredrik Haglind ◽  
...  
Keyword(s):  
Power Generation ◽  
High Pressure ◽  
Gas Turbine ◽  
Dynamic Model ◽  
Gas Turbines ◽  
Oil And Gas ◽  
Dynamic Performance ◽  
Transient Operation ◽  
Generation System ◽  
Power Generation System

On off-shore oil and gas platforms two or more gas turbines typically support the electrical demand on site by operating as a stand-alone (island) power system. As reliability and availability are major concerns during operation, the dynamic performance of the power generation system becomes a crucial aspect for stable operation and prevention of unwanted shut down in case of disturbances in the local grid. This paper aims at developing and validating a dynamic model of the gas turbine-based power generation system installed on the Draugen off-shore oil and gas platform (located in the North Sea, Norway). The dynamic model of the SGT-500 gas turbine includes dynamic equations for the combustion chamber and for the high pressure, low pressure and turbine shafts. The low and high pressure compressors are modeled by using quasi steady-state conditions by scaling the maps of axial compressors employing a similar design point. For the turbines, the Stodola equation as well as a correlation relating the isentropic efficiency and the non-dimensional flow coefficient is utilized. The model is implemented in the Modelica language. The dynamic model of a single SGT-500 gas turbine is first verified by comparing the transient response for a given load variation with the results of a non-physical Matlab model developed by the gas turbine manufacturer and adapted to the power set-point of the original engine installed on Draugen. Subsequently, the complete power generation system consisting of three gas turbines is simulated during transient operation and the results are compared with operational data provided by the platform operator. The model is also applied to evaluate the transient response of the system during peak loads. The results suggest that the highest accuracy (average relative error ∼1%) arises on the prediction of the rotational speed of the high pressure shaft, while the largest deviation (average relative error ∼20%) occurs in the evaluation of the pressure at the outlet of the low pressure turbine. As waste heat recovery units (e.g. organic Rankine cycles) are likely to be implemented in future off-shore platforms, the proposed model may serve in the design phase for a preliminary assessment of the dynamic response of the power generation system and to evaluate if requirements such as minimum and maximum frequency during transient operation and the recovery time are satisfied. Furthermore, as the model is based on physics it can be coupled with the measuring instruments to monitor the thermodynamic variables at the inlet and at the outlet of each engine component.

scholarly journals Development of a Low-NOx LBG Combustor for Coal Gasification Combined Cycle Power Generation Systems

1989 ◽  
Author(s):  
M. Sato ◽  
T. Abe ◽  
T. Ninomiya ◽  
T. Nakata ◽  
T. Yoshine ◽  
...  
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Generation System ◽  
Combustion Technology ◽  
Power Generation System ◽  
Combustion Tests ◽  
Power Generation Systems

From the view point of future coal utilization technology for the thermal power generation systems, the coal gasification combined cycle system has drawn special interest recently. In the coal gasification combined cycle power generation system, it is necessary to develop a high temperature gas turbine combustor using a low-BTU gas (LBG) which has high thermal efficiency and low emissions. In Japan a development program of the coal gasification combined cycle power generation system has started in 1985 by the national government and Japanese electric companies. In this program, 1300°C class gas turbines will be developed. If the fuel gas cleaning system is a hot type, the coal gaseous fuel to be supplied to gas turbines will contain ammonia. Ammonia will be converted to nitric oxides in the combustion process in gas turbines. Therefore, low fuel-NOx combustion technology will be one of the most important research subjects. This paper describes low fuel-NOx combustion technology for 1300°C class gas turbine combustors using coal gaseous low-BTU fuel as well as combustion characteristics and carbon monoxide emission characteristics. Combustion tests were conducted using a full-scale combustor used for the 150 MW gas turbine at the atmospheric pressure. Furthermore, high pressure combustion tests were conducted using a half-scale combustor used for the 1 50 MW gas turbine.

Proposal of Innovative Gas Turbine Combined Cycle Power Generation System

2004 ◽  
Author(s):  
Hideto Moritsuka
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Thermal Efficiency ◽  
Pressure Ratio ◽  
Combined Cycle ◽  
Inlet Temperature ◽  
Generation System ◽  
Turbine Inlet Temperature ◽  
Turbine Inlet ◽  
Power Generation System

In order to estimate the possibility to improve thermal efficiency of power generation use gas turbine combined cycle power generation system, benefits of employing the advanced gas turbine technologies proposed here have been made clear based on the recently developed 1500C-class steam cooling gas turbine and 1300C-class reheat cycle gas turbine combined cycle power generation systems. In addition, methane reforming cooling method and NO reducing catalytic reheater are proposed. Based on these findings, the Maximized efficiency Optimized Reheat cycle Innovative Gas Turbine Combined cycle (MORITC) Power Generation System with the most effective combination of advanced technologies and the new devices have been proposed. In case of the proposed reheat cycle gas turbine with pressure ratio being 55, the high pressure turbine inlet temperature being 1700C, the low pressure turbine inlet temperature being 800C, combined with the ultra super critical pressure, double reheat type heat recovery Rankine cycle, the thermal efficiency of combined cycle are expected approximately 66.7% (LHV, generator end).

Study of the Effect of the Operating Conditions on the MCFC-Biomass Gasification Power Generation System

2014 ◽  
Vol 953-954 ◽  
pp. 317-320
Author(s):  
Ai Guo Liu ◽  
Bing Wang ◽  
Kai Liu ◽  
Cheng Jun Wang
Keyword(s):  
Power Generation ◽  
Hybrid System ◽  
System Performance ◽  
Biomass Gasification ◽  
Operating Conditions ◽  
Inlet Temperature ◽  
Molten Carbonate ◽  
Generation System ◽  
Operation Conditions ◽  
Power Generation System

The combination of biomass gasification and molten carbonate fuel/micro-gas turbine (MCFC/MGT) hybrid system offers great potential as a future sustainable power generation system. A numerical model of a 100 kW classic MCFC/MGT hybrid system using biomass syngas as fuel has been developed. The simulation was performed to investigate the influence of operation conditions and the syngas compositions on the system performance. The results show that the MCFC/MGT can keep its performance when using syngas gas as fuel which confirms the feasibility of biomass gasification-MCFC/MGT hybrid system. According to the simulation results, the increase of MGT pressure ration and MCFC inlet temperature positively affects the system performance, the fluctuation of syngas composition has little effects on the system.

scholarly journals A Study on a Steam Distribution Technology for use in Hydrogen Production and Power Generation

2018 ◽  
Vol 1 (1) ◽  
pp. 293-297
Author(s):  
Sunhee Oh ◽  
Jeachul Jang ◽  
Chongpyo Cho ◽  
Yong Tae Kang ◽  
Seong-Ryong Park
Keyword(s):  
Numerical Simulation ◽  
Power Generation ◽  
High Temperature ◽  
Hydrogen Production ◽  
Pressure Loss ◽  
Generation System ◽  
Ansys Fluent ◽  
Power Generation System ◽  
High Temperature Steam

The high-temperature steam is used in the fields of industrial, residential, and commercial. Especially, in case of high-temperature steam, it can be used to produce hydrogen and likewise it can be used to generate electricity in the field of power generation. However, the steam condition for producing hydrogen and the steam condition for producing electricity are different, it is considerably important to distribute the high-temperature steam in condition satisfying each demand. Moreover, the required pressure and the pressure loss of a steam distributor at the load side should be considered. Therefore, In this study, the numerical simulation using ANSYS fluent was performed by dividing into pipe A(4,000kPa at use of power generation system) and pipe B(300kPa at use of hydrogen production). In addition, it was simulated according to the variation of diameter of pipe B(20mm - 30mm) for analysis of a steam distribution techology. The pressure outlet that can be used in hydrogen production was about 300kPa approximately when the diameter of pipe B was 20mm. As a result, the distribution technology that is used hydrogen production and in the power generation system was obtained through numerical simulation in proposed condition.

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