Energy, exergy, and sensitivity analyses of a new integrated system for generation of liquid methanol, liquefied natural gas, and crude helium using organic Rankine cycle, and solar collectors

2021 ◽  
Author(s):  
Bahram Ghorbani ◽  
Majid Amidpour
Keyword(s):  
Natural Gas ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Liquefied Natural Gas ◽  
Integrated System ◽  
Sensitivity Analyses ◽  
Solar Collectors

Energy Recovery in Natural Gas Compressor Stations Taking Advantage of Organic Rankine Cycle: Preliminary Design Analysis

2017 ◽  
Author(s):  
M. Bianchi ◽  
L. Branchini ◽  
A. De Pascale ◽  
F. Melino ◽  
V. Orlandini ◽  
...  
Keyword(s):  
Natural Gas ◽  
System Performance ◽  
Gas Turbines ◽  
Energy Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Integrated System ◽  
Specific Power ◽  
Condensation Temperature ◽  
Power Recovery

Gas compressor stations represent a huge potential for exhaust heat recovery. Typical installations consist of open cycle configurations with multiple gas turbine units, usually operated under part-load conditions during the year with limited conversion efficiency. At least, one of the installed unit serves as back-up to ensure the necessary reserve power and the safe operation of the station. Organic Rankine Cycle (ORC) has been proven as an economical and environmentally friendly solution to recover waste heat from gas turbines, improving the overall energy system performance and reducing the CO2 emissions. In this context, taking as reference typical gas compressor stations located in North America, the paper investigates the potential benefit of ORC application, as bottomer section of gas turbines, in natural gas compression facilities. Thus, ORC converts gas turbines wasted heat into useful additional power that can be used inside the compression facility reducing the amount of consumed natural gas and, consequently, the environmental emissions, or directed to the grid, thus furthermore earning economic benefits. Different case studies are examined with reference to two typical compressor station size ranges: a “small-medium” and a “medium-high” size range. Two different gas turbine models are considered according to most common manufacturers. Typical gas compressor stations and integrated cycle configurations are identified. Based on Turboden experience in development and production of ORCs, specific design options and constraints, layout arrangements and operating parameters are examined and compared in this study, such as the use of an intermediate heat transfer fluid, the type of organic fluid, the influence of superheating degree and condensation temperature values. Emphasis is given on thermodynamic performance of the integrated system by evaluating thermal energy and mechanical power recovery. Several key performance indexes are defined such as, the ORC power and efficiency, the specific power recovery per unit of compression power, the integrated system net overall power output and efficiency, the ORC expander and heat exchangers size parameters, the carbon emission savings, etc. The performed comparison of various configurations shows that: (i) the energy recovery with ORC can be remarkable, adding up to more than 35% of additional shaft power to the compression station in the best configuration; (ii) the ORC condensation temperature value has a significant impact on the ORC bottomer cycle and on the integrated system performance; (iii) in case of Cyclopentane, keeping the same ORC cycle operating parameters, the max specific power recovery is achieved in the direct configuration case, (iv) the bottomer cycle size can be reduced with the use of a refrigerant fluid (R1233zd(E)), compared to hydrocarbon fluids; (v) the max environmental benefit can be up to 120 kg CO2/h saved per MW of installed compression power.

Heat Recovery From a Liquefied Natural Gas Production Process by Means of an Organic Rankine Cycle

2018 ◽  
Author(s):  
M. A. Ancona ◽  
M. Bianchi ◽  
L. Branchini ◽  
A. De Pascale ◽  
F. Melino ◽  
...  
Keyword(s):  
Natural Gas ◽  
Production Process ◽  
Heat Recovery ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Gas Production ◽  
Liquefied Natural Gas ◽  
Working Fluid ◽  
Energy Market ◽  
Natural Gas Production

In the last years, the increased demand of the energy market has led to the increasing penetration of renewable energies in order to achieve the primary energy supply. However, natural gas is expected to still play a key role in the energy market, since its environmental impact is lower than other fossil fuels. It is mainly employed as gaseous fuel for stationary energy generation, but also as liquefied fuel, as an alternative to the diesel fuel, in vehicular applications. Liquefied Natural Gas is currently produced mainly in large plants directly located at the extraction sites and transported by ships or tracks to the final users. In order to avoid costs and environmental related impact, in previous studies Authors developed a new plant configuration for liquefied natural gas production directly at filling stations. One of the main issues of the process is that in various sections the working fluid needs to be cooled by external fluids (such as air for compressor inter and after-cooling or chilling fluids), in order to increase the global performances. As a consequence, an important amount of heat could be potentially recovered from this Liquefied Natural Gas production process. Thus, based on the obtained results, in this study the integration between the liquefaction process and an organic Rankine cycle is proposed. In fact, the heat recovered from the Liquefied Natural Gas production process can be used as hot source within the organic Rankine cycle. The aim of the work is the identification of the optimal integrated configuration, in order to maximize the heat recovery and, as a consequence, to optimize the process efficiency. With this purpose, in this study different configurations — in terms of considered organic fluid, architecture and origin of the recovered heat — have been defined and analyzed by means of a commercial software. This software is able to thermodynamically evaluate the proposed process and had allowed to define the optimal solution.

scholarly journals Thermo-Economic Analysis on Integrated CO2, Organic Rankine Cycles, and NaClO Plant Using Liquefied Natural Gas

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2849
Author(s):  
Tri Tjahjono ◽  
Mehdi Ali Ehyaei ◽  
Abolfazl Ahmadi ◽  
Siamak Hoseinzadeh ◽  
Saim Memon
Keyword(s):  
Natural Gas ◽  
Heat Source ◽  
Potable Water ◽  
Net Present Value ◽  
Electrical Power ◽  
Organic Rankine Cycle ◽  
Electrical Energy ◽  
Rankine Cycle ◽  
Payback Period ◽  
Liquefied Natural Gas

The thermal energy conversion of natural gas (NG) using appropriate configuration cycles represents one of the best nonrenewable energy resources because of its high heating value and low environmental effects. The natural gas can be converted to liquefied natural gas (LNG), via the liquefaction process, which is used as a heat source and sink in various multigeneration cycles. In this paper, a new configuration cycle is proposed using LNG as a heat source and heat sink. This new proposed cycle includes the CO2 cycle, the organic Rankine cycle (ORC), a heater, a cooler, an NaClO plant, and reverse osmosis. This cycle generates electrical power, heating and cooling energy, potable water (PW), hydrogen, and salt all at the same time. For this purpose, one computer program is provided in an engineering equation solver for energy, exergy, and thermo-economic analyses. The results for each subsystem are validated by previous researches in this field. This system produces 10.53 GWh electrical energy, 276.4 GWh cooling energy, 1783 GWh heating energy, 17,280 m3 potable water, 739.56 tons of hydrogen, and 383.78 tons of salt in a year. The proposed system energy efficiency is 54.3%, while the exergy efficiency is equal to 13.1%. The economic evaluation showed that the payback period, the simple payback period, the net present value, and internal rate of return are equal to 7.9 years, 6.9 years, 908.9 million USD, and 0.138, respectively.

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