A phenomenological base semi-physical thermodynamic model for the cylinder and exhaust manifold of a natural gas 2-megawatt four-stroke internal combustion engine

Abstract

This paper presents the application of a systematic methodology to obtain a semi-physical model of phenomenological base for a 2 MW internal combustion engine to generate electric power operating with natural gas, as a function of the average thermodynamic value normally measured in industrial applications. Specifically, the application of the methodology is focused on the cylinders, exhaust manifold, and turbocharger turbine sections. The proposed model was validated with actual operating data, obtaining an error rate not exceeding 5%, which allow a thermal characterization of the Jenbacher JMS 612 GS-N based on the model. A parametric analysis is conducted; considering the volumetric efficiency, the output electric power, the effective efficiency, the exhaust gas temperature, the turbine mass flow, the specific fuel consumption under the nominal operation conditions, which is 1.16 bar in the gas pressure, 65 °C in the cooling water temperature, 35 °C in the average ambient temperature, and 1500 rpm. The results of this model can be used to evaluate the thermodynamic performance parameters of waste heat recovery systems. On the other hand, new control strategies and the implementation of state observers for the detection and diagnosis of failures can be developed based on the proposed model.

Exergy, Economic, and Life-Cycle Assessment of ORC System for Waste Heat Recovery in a Natural Gas Internal Combustion Engine

“…The thermo-economic and environmental impact assessment of the waste heat recovery system based on ORC for the generation engine requires the evaluation and characterization of the thermal energy available in the exhaust gases. Therefore, a dynamic engine model of the engine whose characteristic parameters can be observed in Table 1 was developed in detail as a function of the mean value measured [35]. Table 1.…”

Economic and Exergo-Advance Analysis of a Waste Heat Recovery System Based on Regenerative Organic Rankine Cycle under Organic Fluids with Low Global Warming Potential

“…The only way to limit it is through the efficient use of energy in the energy generation systems, and the increase of the green mass of the planet [4]. Two different methodologies have been proposed to promote rational energy use through the WHRS to increase the energy efficiency of combustion engine systems [5].…”

“…Currently, the 2 MW Jenbacher Generation JMS 612 GS-N gas engine is commonly used for auto-generation reasons, and it is operating in the plastic industry in Barranquilla, Colombia, without any WHRS. The engine operates with a thermal performance of 38.58%, which is an average value of this type of engine functioning in Colombia [4]. Additionally, it has been proposed to optimize thermo-economically the integration of different configurations of ORC cycles to the Jenbacher JMS 612 GS-N Engine, seeking to obtain both the lowest level cost of electric energy and the highest thermal efficiency of the heat recovery system [5,6].…”

Advance Exergo-Economic Analysis of a Waste Heat Recovery System Using ORC for a Bottoming Natural Gas Engine

“…To complete the thermal cycle, the organic fluid decreases the pressure to its lowest point, passing to the condensation stage from S7 to S8 (338 K, 675 kPa). The 2 MW Jenbacher engine JMS 612 GS-N. L was modeled and studied, as shown in Figure 2, with its technical specifications and nominal operating conditions [29]. This engine operates with natural gas as fuel, since its high robustness allows it to better adapt to variable load regimes.…”

“…The engine regulates fuel consumption to operate between a minimum load of 1000 kWe and a maximum load of 1982 kWe, with an excess air number (lambda) of 1.79 and 1.97, respectively, generating unused exhaust gases in each of its 12 cylinders with a temperature ranging from 580 to 650 °C. The 2 MW Jenbacher engine JMS 612 GS-N. L was modeled and studied, as shown in Figure 2, with its technical specifications and nominal operating conditions [29]. This engine operates with natural gas as fuel, since its high robustness allows it to better adapt to variable load regimes.…”