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

¹ Department of Mechanical Engineering, Urmia, Iran
² National Iranian Gas Company, Gas Transmission Operation Destination 8, Iran

^a Corresponding author: mjavadzadeh2007@gmail.com

Received: 3 October 2014
Accepted: 22 October 2014

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.