Development and comparison of two expander cycles used in refrigeration system of olefin plant based on exergy analysis

A user‐coded, customized methodology for exergy balance and analysis of chemical and thermal processes is developed with the Aspen HYSYS process simulator, to assess and explain exergy loss in steam methane reforming. Exergy analysis is presented for four configurations of primary and secondary reformers to produce synthesis gas: (1) an autothermal reformer (ATR) alone, (2) a top‐fired reformer (TFR) alone, (3) ATR‐TFR configured in parallel, and (4) ATR‐TFR configured in series. The same states and feed conditions, i.e., mass flow rate, temperature, pressure, and feed gas composition, are applied to the four reformer configurations considered, with the single ATR showing the lowest exergy loss of about 0.43 W kg−1 of dry productivity.

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“…The exergy efficiency of the mixing unit is then expressed as Eq. :

true ε_{normalMixing} = \frac{{\overset{\cdot}{m}}_{normalhot normal, normalin} (e_{x_{out}} - e_{x_{in}})}{{\overset{\cdot}{m}}_{normalcold normal, normalin} (e_{x_{out}} - e_{x_{in}})}

…”

Section: Exergy Calculation Methodologymentioning

confidence: 99%

“…This can be explained in terms of Eqs. (12), (14), (16), and (18), in which exergy changes are based on the difference between the input exergy and the output exergy. In the reactor systems, temperature and pressure variations have a significant impact on the exergy changes.…”

Section: Exergy Changes Observedmentioning

confidence: 99%

Comparison of Exergy Losses for Reformers Involved in Hydrogen and Synthesis Gas Production

Behroozsarand

Wood

2019

Chem Eng & Technol

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“…The combination of these two refrigerants was used to achieve lower specific energy consumption. Mahabadipour and Ghaebi (2013) use different refrigerant based expander process for olefin refrigeration plant and show that nitrogen is the best option among different refrigerants used. Finn, July (2009) gives the basic flow sheet of dual nitrogen expander process and illustrates that the use of two expanders enable the NG to be cooled and condensed at small temperature difference.…”

Section: Overview Of the Available Dual Nitrogen Expander Processesmentioning

confidence: 99%

Knowledge inspired investigation of selected parameters on energy consumption in nitrogen single and dual expander processes of natural gas liquefaction

Khan

Lee

Getu

et al. 2015

Journal of Natural Gas Science and Engineering

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“…They also concluded the exergy is appropriate for general statistical use, both as a measure of resource stocks and flows and as a measure of waste emissions and potential for causing environmental harm. Other notable studies on exergy assessment to augment environmental sustainability of the utility of the industrial production plants are: analysis of an ammonia production plant [17], two expander cycles in a refrigeration unit [18], optimization of a post-combustion CO 2 recovery unit utilizing the adsorption system for a natural gas-fired power plants [19], and environmental and exergetic impacts of a cement production process [20]. Recently, Rabbani et al [21] evaluated the processing parameters and impacts on chloralkali products in an electrolysis-centered chloralkali reactor, followed by examination of the photoelectrochemical chloralkali technology for hydrogen and sodium hydroxide production [22].…”

Section: Introductionmentioning

confidence: 99%

Exergetic environmental sustainability assessment supported by Monte Carlo simulations: A case study of a chlorine production process

Ghannadzadeh

Tarighaleslami

2019

Env Prog and Sustain Energy

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Chlorine production process can result in discharge of tremendously harmful materials besides it requires high‐energy need, which basically can also lead to additional environmental impacts. This article presents an exergy‐aided life cycle assessment (LCA) to evaluate power generation from natural gas and biomass in the phase of green energy transition to augment the sustainability as much as attainable. A series of statistically discernible scenarios assisted by Monte Carlo Simulation are specified. Results show a reduction in environmental impacts from 2.249E‐02 to 2.180E‐02 MJ‐Eq of nonrenewable energy supplies in accordance with the cumulative exergy demand or from 1.28E‐06 to 7.62E‐07 in accordance with ReCiPe 2008, paving the way toward an environmentally sustainable chlorine production process. LCA is useful to measure the environmental impacts of each chemical constituent accurately, showing that CO2 emitted from this process has much more unfavorable impacts than other harmful materials on human health. Furthermore, LCA discloses that the natural gas could even be less environmentally sustainable than residual fuel oil concerning human toxicity freshwater ecotoxicity, marine ecotoxicity, particulate matter formation, terrestrial acidification, and fossil depletion impacts. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Development and comparison of two expander cycles used in refrigeration system of olefin plant based on exergy analysis

Cited by 18 publications

References 11 publications

Comparison of Exergy Losses for Reformers Involved in Hydrogen and Synthesis Gas Production

Comparison of Exergy Losses for Reformers Involved in Hydrogen and Synthesis Gas Production

Knowledge inspired investigation of selected parameters on energy consumption in nitrogen single and dual expander processes of natural gas liquefaction

Exergetic environmental sustainability assessment supported by Monte Carlo simulations: A case study of a chlorine production process

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