Gas engines fuel rates

Here are heat rates, for initial estimating, for gas engines. 

Equipment Design Handbook for Refineries and Chemical Plants, Vol. 1. 2nd Ed., Gulf Publishing Co., 1979. 

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The IC engine is defined as a spark ignition gas engine. The sub-model calculates combustion product composition and flow-rate assuming complete combustion at an equivalence ratio (air-to-fuel basis) of 1.7, typical of modem low-NOx spark ignition designs in which lean combustion is employed. 

Experiments have been performed of gasification of wood pellets. The feeding rate was about 5 kg/h, giving an effect of 30 kW. The amount of air supplied to the reactor has been varied in the experiments, in addition to the location of the supply. The fuel gas composition has been measured with a GC. The amount of product gas obtained is about 12.5 Nm /h and has a heating value of 4.9 MJ/Nm. From these data, the power produced by the gas engine is expected to be about 5 kW . 

Fig. 1 Fast GC analysis of aviation turbine engine fuel using a typical laboratory GC instrument. Conditions hydrogen carrier gas temperature programming rate, 70-170°C at 120°C/min (actual 75°C/min) microbore column 3 m x 0.10 mm ID.

Some engineering companies use the heat of oxidation of the load itself to reduce their estimate of required furnace fuel rate. Load oxidation heat is a very small fraction of the heat in most furnaces, except incinerators, and it is usually very expensive. For steel loads, heat from oxidizing steel costs more than 20 times that of heat from natural gas. One cannot measure the quantity of load oxidized or where it occurs in the furnace. 

FIGURE 6.94 Fuel consumption rates for the natural gas engine. (Waukesha Engine Division, Dresser Industries, Inc.)... 

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