Optimal operation of a large-scale liquid hydrogen plant utilizing mixed fluid refrigeration system

2014 ◽  
Vol 39 (13) ◽  
pp. 7015-7029 ◽  
Author(s):  
Songwut Krasae-in
Keyword(s):  
Large Scale ◽  
Liquid Hydrogen ◽  
Optimal Operation ◽  
Refrigeration System ◽  
Hydrogen Plant ◽  
Mixed Fluid

scholarly journals Combined Aggregated Sampling Stochastic Dynamic Programming and Simulation-Optimization to Derive Operation Rules for Large-Scale Hydropower System

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 625
Author(s):  
Xinyu Wu ◽  
Rui Guo ◽  
Xilong Cheng ◽  
Chuntian Cheng
Keyword(s):  
Dynamic Programming ◽  
Stochastic Dynamic Programming ◽  
Large Scale ◽  
Simulation Optimization ◽  
Optimal Operation ◽  
Stochastic Dynamic ◽  
Operation Model ◽  
Two Stage ◽  
Operation Rules ◽  
Reservoir Systems

Simulation-optimization methods are often used to derive operation rules for large-scale hydropower reservoir systems. The solution of the simulation-optimization models is complex and time-consuming, for many interconnected variables need to be optimized, and the objective functions need to be computed through simulation in many periods. Since global solutions are seldom obtained, the initial solutions are important to the solution quality. In this paper, a two-stage method is proposed to derive operation rules for large-scale hydropower systems. In the first stage, the optimal operation model is simplified and solved using sampling stochastic dynamic programming (SSDP). In the second stage, the optimal operation model is solved by using a genetic algorithm, taking the SSDP solution as an individual in the initial population. The proposed method is applied to a hydropower system in Southwest China, composed of cascaded reservoir systems of Hongshui River, Lancang River, and Wu River. The numerical result shows that the two-stage method can significantly improve the solution in an acceptable solution time.

scholarly journals Zero boil-off methods for large-scale liquid hydrogen tanks using integrated refrigeration and storage

2017 ◽  
Vol 278 ◽  
pp. 012012
Author(s):  
W U Notardonato ◽  
A M Swanger ◽  
J E Fesmire ◽  
K M Jumper ◽  
W L Johnson ◽  
...  
Keyword(s):  
Large Scale ◽  
Liquid Hydrogen ◽  
And Storage

Optimal Operation and Maintenance of Gas Compressor Stations: An Integrated Framework Applied to a Large-Scale Industrial Case

2015 ◽  
Vol 138 (4) ◽  
Author(s):  
Dionysios P. Xenos ◽  
Erling Lunde ◽  
Nina F. Thornhill
Keyword(s):  
Optimization Model ◽  
Large Scale ◽  
Optimal Schedule ◽  
Optimal Operation ◽  
Optimal Distribution ◽  
Compressor Station ◽  
Operational Costs ◽  
Operation And Maintenance ◽  
Maintenance Model ◽  
Operational Aspects

This paper presents a framework which integrates maintenance and optimal operation of multiple compressors. The outcome of this framework is a multiperiod plan which provides the schedule of the operation of compressors: the schedule gives the best decisions to be taken, for example, when to carry out maintenance, which compressors to use online and how much to load them. These decisions result in the minimization of the total operational costs of the compressors while at the same time the demand of the plant is met. The suggested framework is applied to an industrial gas compressor station which encompasses large multistage centrifugal compressors operating in parallel. The optimization model of the framework consists of three main parts: the models of compressor maps, the operational aspects of compressors, and a maintenance model. The results illustrate the optimal schedule for 90 days and an example of the optimal distribution of the load of the compressors for 5 days. Finally, the results show the economical benefits from the integration of maintenance and optimization.

Research on Optimal Operation in Large-Scale Steam Piping System

2007 ◽  
pp. 593-596 ◽  
Author(s):  
Hongling Yu ◽  
Guojun Li ◽  
Fan Zhu ◽  
Qilin Gui ◽  
Ruiyang Li
Keyword(s):  
Large Scale ◽  
Optimal Operation ◽  
Piping System

Current and Future Trends of Refrigerants Development

2016 ◽  
pp. 474-524
Author(s):  
M. V. Duarte ◽  
L. C. Pires ◽  
P. D. Silva ◽  
P. D. Gaspar
Keyword(s):  
Global Warming ◽  
Ethyl Ether ◽  
Large Scale ◽  
Environmental Issues ◽  
Ozone Layer ◽  
Environmental Concerns ◽  
Historical Evolution ◽  
Future Trends ◽  
Refrigeration System

In this chapter is addressed the thematic of refrigerants: its historical evolution; properties; legislation applied in the area and future trends. The first refrigerant being marketed on a large scale was ethyl ether (R610), in 1834. Since then, the evolution of the utilized refrigerants was stimulated, initially due to constructive issues in the refrigeration system and later to environmental issues. This evolution may be divided into four generations: 1st use of any fluid that worked; 2nd safety and durability of the equipment; 3rd ozone layer protection and 4th increase of global warming concerns. During the process of evolution many refrigerants were tested to understanding of their properties. Currently, environmental concerns are taken as guide in the search for new refrigerants. The most promising refrigerants to be used in future are the HFEs, HFOs and HFCs with low-GWP, natural refrigerants and blends between (HCs/HFCs and HFCs/HFOs) refrigerants.

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