Redução de consumo específico de combustível através da redução da temperatura do ar de combustão em motogeradores de ciclo Diesel

Abstract

This technical article presents a case study of reducing specific consumption of HFO- Heavy Fuel Oil fuel in 120 HYUNDAI HiMSEN 9H25/33 motor generators installed in two thermoelectric plants belonging to the same enterprise composed of by two engine rooms with a total electrical power generation capacity of 298 MW located in the State of Bahia, Brazil. Due to the need to reduce costs operational, in April 2013, a project was proposed that aimed to reduce consumption fuel specification by reducing the intake air temperature of the turbochargers to improve the efficiency of the combustion process in motor generators aforementioned. The project was based on information contained in the technical manual of the equipment, which presents the specific consumption correction formula according to the operational conditions of the HYUNDAI HiMSEN 9H25/33 motor generators, taking as variables: specific fuel consumption in standard condition according to ISO 3046/1; O specific fuel consumption in operating condition; the deviation from specific consumption of fuel; the ambient air temperature in the operating condition; the temperature of the charge air cooling water in the operating condition; the lower calorific value (PCI) of the fuel oil and ambient pressure in the operating condition. After project implementation of reducing the temperature of the combustion air, a reduction in the maximum temperature was verified turbocharger intake pressure from 45.0ºC to 35.9ºC, generating a temperature delta of 9.1 ºC, which made it possible to reduce the specific consumption of HFO-Heave Fuel Oil equivalent to 0.915 kg/MWh and, consequently, for a scenario of continuous generation of 280 MWh provided significant reductions in operating costs with the acquisition of fuel.