Optimizing output gas temperature of the pressure reducing station in Shahid Kaveh combined cycle power

The pressure of natural gas in letdown station is reduced in order to reach the desired pressure for using the other units. The present work is done to optimize the output temperature of pressure regulating station at “Shahid Kaveh of Qaen” combined cycle power plant. The reported optimization is based on prevention of the clathrate hydrates formation, the temperature domain, in which the energy consumption is optimized and combustion efficiency at gas consumption post is appropriate. The purposes of this optimization are fuel consumption reduction, better operation of gas heaters, operating costs decrease, less damage in mechanisms and construction period reduction . In order that, at first the gas regulator geometry is modeled then with Computational fluid dynamics, the simulations and analysis are done . Finally, by comparing the output gas temperature with the standard temperature range of natural gas extracted from engineering handbooks, the adjustment of the heater output temperature is possible in order to prevent the formation of gas hydrates.