The described empirical investigations deliver the input parameters for the simulation model, in which the exhaust gas flow rate, the exhaust gas temperature
, and the N[O.sub.2]/N[O.sub.x] ratio at the entrance of the exhaust gas after treatment system represent the most important variables.
The engine experiments show that exhaust gas temperature
and mass flow are increased by lower injection pressures and as expected the effect is slight and mostly noticeable at very low pressures below 50 bar.
deviation 1.7996899 4.1258416 0.0465146 Range 9.5000 51.7000 0.5470 Minimum -1.8000 -21.8000 0.7750 Maximum 7.7000 29.9000 1.3220 Statistics Total air Ground/air Exhaust gas temperature
temperature N Valid 1005 1005 1005 Missing 0 0 0 Mean -3.034229 0.87 584.232836 Median -3.300000 1.00 574.500000 Std.
The inlet to the rig exhaust network was attached several meters downstream of a natural gas burner capable of generating exhaust gas temperatures
of up to 1000 [degrees]C and mass flow rates of up to 750 kg/hr.
Further, it is necessary to ensure the exhaust gas temperature
out of the heat exchanger higher than 200[degrees]C in order to avoid the dew point corrosive phenomenon.
Water is the preferable working fluid for high exhaust gas temperature
due to its high evaporation enthalpy and thus higher power output and thermal efficiency.
Many LTHW boilers are limited to a turndown of just 2:1 or 3:1 to ensure that the boiler exhaust gas temperatures
are maintained above the 130-140[degrees]C required to avoid condensation.
This trend of exhaust heat loss can also be explained from the exhaust gas temperature
The exhaust gas temperature
and flow rate with increasing the engine load is increased.
Another problem can occur when an engine is shut down quickly after being operated at high speed and load where the exhaust gas temperature