Thermodynamic evaluation of gas compression station from the point of energy and exergy view with an approach to reduce energy consumptions and emissions: A case study

Mohammad Javadzadeh,Samad Jafarmadar,Shahram Khalilarya,Babak Amirkamvar

doi:10.1051/meca/2015083

Mohammad Javadzadeh, Samad Jafarmadar + Show 2 more

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https://doi.org/10.1051/meca/2015083

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Abstract

The objective of the present study is to evaluate the gas compression station installed in Marand city from the point of energy and exergy view with an approach to reduce energy consumptions and emissions. The use of exhaust gases thermal energy is investigated to produce steam and electrical power. This free extra electrical power can be used in electrical facilities of the gas turbine unit and the gas compression station can be independent from foreign electrical energy sources. Meanwhile replacement of existing gas turbine starting system and the effects of inlet air temperature, steam injection to the combustion chamber and the steam generator pinch point are studied on fuel consumption, net power production, nitrogen oxides emissions and irreversibilities in various loads. The results revealed that in the proposed gas compression station the produced electrical power from the generated steam in the minimum load and inlet air temperature of 288 K is more than the overall electrical energy consumptions. Steam injection with amount of 0.5 kg.s-1 to the combustion chamber increased the cycle efficiency from 34% to 37.5% and decreased the emission from 3.1 ppm to 0.45 ppm in full load condition.

Highlights

In today’s world due to industrial developments and population growth the demand for energy consumption is increasing and efforts to secure energy resources and deliver it to the consumers are of the main challenges
The aim of this work is to evaluate the gas compression station installed in Marand city from the point of energy and exergy view with an approach to reduce energy consumptions and emissions
In this research the use of exhaust gases thermal energy is investigated to produce steam and electrical power. This free extra electrical power can be used in electrical facilities of the gas turbine unit and the gas compression station can be independent from foreign electrical energy sources

Summary

Introduction

In today’s world due to industrial developments and population growth the demand for energy consumption is increasing and efforts to secure energy resources and deliver it to the consumers are of the main challenges. Natural gas is one of the main energy providing sources that has significant contribution in energy supply which is needed for main industries and thermal energy consumption in domestic applications and the role of natural gas in the industrial economy and society is revealed [1]. (1) In the studied gas compression station the thermal efficiency of the gas turbines is approximately 30% and this means that about 70% of the fuel energy is excreted to the environment without any use as an exhaust heat losses. (2) There from in gas turbines, natural gas is usually used as the fuel, so the cost of this fuel supply is high. (3) The existing expansion starter turbine discharges large amount of natural gas into the atmosphere. Pressure (bar) Temperature (K) Power (kW) Mass flow (kg.s−1) Specific heat at constant pressure Entropy (kj.kg−1.K−1) Irreversibility (kW) Forward reaction constant Reverse reaction constant Specific heat ratio Destruction exergy (kW) Working fluid exergy (kW) pp h LHV

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