Importance

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Abstract

A parametric emissions monitoring system for monitoring stationary engine/compressor units coupled to a pipeline provides, in a reciprocating embodiment, reliable and accurate determinations of emission levels for NO.sub.x, CO, and total hydrocarbons (THC) from an emissions matrix primarily as a function of engine speed and engine torque. Validation of the determined emissions level is provided by comparing the values of a set of actual engine operating parameters with a respective value in a set of calculated engine operating parameters to determine whether the deviation of the actual operating parameter from the expected operating parameter is within a defined range, and thus whether the engine is operating within a defined control envelope. Each set of engine operating parameters includes spark ignition timing, fuel rate, and air manifold pressure. When the comparison indicates that the actual engine operating parameters diverge from the respective expected engine operating parameter, the emissions are determined from the emissions matrix, and are subjected to a bias factor being assessed against the NO.sub.x, CO and THC emissions level, the bias factor depending on the severity of the deviation. Moreover, these biased emission levels are further biased relatively up or down depending on selected ambient operating conditions, including relative humidity, power cylinder exhaust temperature deviation, and air manifold temperature.

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First Claim