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123 results about "Continuous emission" patented technology

A continuous emission monitoring system (CEMS) is the total equipment necessary for the determination of a gas or particulate matter concentration or emission rate using pollutant analyzer measurements and a conversion equation, graph, or computer program to produce results in units of the applicable emission limitation or standard.

Calibration scheme for continuous monitoring of mercury emissions from stationary sources by plasma emission spectrometry

The disclosed invention relates to a calibration method, system and apparatus for a multimetals continuous emissions monitor system (hereinafter "multimetals CEMS"). More specifically, this invention relates to a calibration scheme for continuous monitoring of mercury emissions from stationary sources by plasma emission spectrometry. A source of mercury vapor, preferably a mercury permeation tube, entrains mercury vapor into a constant flow of carrier air. The carrier air mixes with a constant flow of diluent air in an aerosol mixer. The mixer is operably coupled to the analyzer. A gaseous mixture having a calibration mercury concentration flows from the mixer into the analyzer at a constant rate. A graph having coordinates of analyzer signal intensity and mercury concentration is used to plot the calibration scheme. A first signal intensity generated by the analyzer in response to the calibration mercury concentration is used for the first plot on the graph. A second signal intensity generated by the analyzer in response to a blank having zero mercury concentration is used as the second plot on the graph. A linear relationship between the analyzer signal intensity and the mercury concentration on the graph is established from the first plot and the second plot. The slope intercept and slope are used to create a mathematical relationship between the analyzer signal intensity and the mercury concentration. This enables the analyzer to be calibrated by inserting a known mercury concentration into the analyzer and adjusting the signal intensity to conform to the signal intensity calculated from the graph or mathematical relationship.
Owner:THE GOVERNMENT OF THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SEC OF THE NAVY NAVAL RES LAB WASHINGTON

SYSTEM AND METHOD FOR OBTAINING AN OPTIMAL ESTIMATE OF NOx EMISSIONS

A control system for providing an optimal estimate of NOx emission in an exhaust during a selective catalytic reduction process is provided. The control system includes a continuous emission monitoring sensor configured to generate a responsive signal representing a first estimate of NOx emission; wherein the responsive signal has a first time lag between a time of measurement of NOx emission and the time when the corresponding responsive signal is made available by the continuous emission monitoring sensor, and the continuous emission monitoring sensor has a first time constant. The control system also includes a virtual sensor configured to generate a relatively faster responsive signal representing a second estimate of NOx emission. The control system further includes a processor that includes a time delay compensation circuit configured to introduce a second time lag in the relatively faster responsive signal, wherein the second time lag matches the first time lag. The processor also includes a low pass filter circuit coupled to the time delay compensating circuit, wherein the low pass filter circuit has a second time constant matching the first time constant to generate a time delayed signal representing a third estimate of NOx emission. The processor is further configured to subtract the time delayed signal from the summation of the responsive signal and the relatively faster responsive signal to generate the optimal estimate of the NOx emission, wherein the optimal estimate is fed as a feedforward signal into an injection system in the selective catalytic reduction process.
Owner:GENERAL ELECTRIC CO
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