Emission monitoring system and method
First Claim
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1. An emission measuring device comprising:
- an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source, means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value, and a dilution probe that receives emitted material and dilution gas which forms a mixture known as diluted sample gas, and that is in communication with the analyzer, said mass flow rate value being a value corresponding to one of a mass flow rate of dilution gas, a mass flow rate of sample gas, and a mass flow rate of emitted material.
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Abstract
An emission measuring system and method provide an accurate, real-time calculation of a particular material emitted from an emission source. Specifically, a CEM system installed in an industrial stack can include a dilution probe located in the stack and a data analyzer that records and analyzes characteristic data of the materials sampled by the dilution probe. A dilution ratio is used to correct for the addition of dilution gas into the stack gas sample to determine the concentration of a particular material that is being emitted from the stack. The dilution ratio is based on a molar flow rate, which can be determined by using specific algorithms and measurements.
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Citations
22 Claims
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1. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source, means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value, and a dilution probe that receives emitted material and dilution gas which forms a mixture known as diluted sample gas, and that is in communication with the analyzer, said mass flow rate value being a value corresponding to one of a mass flow rate of dilution gas, a mass flow rate of sample gas, and a mass flow rate of emitted material. - View Dependent Claims (2)
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3. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source, means connected in the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value; and
a dilution probe connected to said means for calculating and configured to receive a sample gas that includes the emitted material and a dilution gas, wherein the means for calculating the amount of a particular material calculates by using a dilution ratio based on the mass flow rate value, and wherein the dilution ratio is determined as follows;
where D is the dilution ratio, Fda is a mass flow rate of the dilution gas, Tstack is an emission source temperature, M is a molecular weight of the emitted material, Y is a constant, Pabsolute is total emission source pressure, and β
is a thermal expansion coefficient of orifice material located on the dilution probe.
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4. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source; and
means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value, wherein the means for calculating the amount of a particular material calculates by using a dilution ratio based on the mass flow rate value, and wherein the dilution ration is determined as follows;
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5. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source; and
means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value, wherein the means for calculating the amount of a particular material calculates by using a dilution ration based on the mass flow rate value, and wherein the dilution ration is determined as follows;
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6. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source; and
means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value; and
a dilution probe connected to said means for calculating, wherein the emitted material is combined with a dilution gas to form a sample gas, and the means for calculating the amount of a particular material calculates by using a mass flow rate of sample gas determined as follows;
where ms is a mass flow rate of the sample gas, is a constant, Cd is a discharge coefficient, Pabsolute is a total emission source pressure, M is a molecular weight of the sample gas, β
is a thermal expansion coefficient of an orifice material of the dilution probe, Ao is a throat area of a critical orifice of the dilution probe, and Tstack is an emission source temperature.- View Dependent Claims (7, 8)
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9. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source; and
means connected to the analyzer for calculating an amount of a particular material contained in the emitted material by using a mass flow rate value, wherein the means for calculating includes a data analyzer that is adapted for use with an existing plant data handling and acquisition system. - View Dependent Claims (10)
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11. A system for use with an emission source comprising:
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a data medium for receiving emission data collected from one of an analyzer and a transmitter, the emission data including one of a pressure, a temperature, and an amount of a particular material emitted from the emission source;
means for calculating an amount of the particular material emitted from the emission source using a mass flow rate value; and
a dilution probe connected to said means for calculating and configured to receive a sample gas that includes said emitted material and a dilution gas, wherein the mass flow rate value includes a mass flow rate of a sample gas and said mass flow rate of the sample gas is calculated as follows;
where ms is a mass flow rate of sample gas, is a constant, Cd is a discharge coefficient, Pabsolute is total emission source pressure, M is a molecular weight of the sample gas, β
is a thermal expansion coefficient of an orifice material of the dilution probe, Ao is a throat area of a critical orifice of the dilution probe, and Tstack is an emission source temperature.
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12. A system for use with an emission source comprising:
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a data medium for receiving emission data collected from one of an analyzer and a transmitter, the emission data including one of a pressure, a temperature, and an amount of a particular material emitted from the emission source;
means for calculating an amount of the particular material emitted from the emission source using a mass flow rate value; and
a dilution probe that has an orifice for receiving a sample gas which includes the particular material combined with a dilution gas, wherein the means for calculating an amount of the particular material emitted from the emission source calculates a concentration of the particular material using a dilution ration as follows;
where D is the dilution ratio, Fda is a mass flow rate of dilution gas, Tstack is an emission source temperature, M is a molecular weight of the sample gas, y is a constant, Pabsolute is total emission source pressure, and β
is a thermal expansion coefficient of an orifice material of the dilution probe.
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13. A system for use with an emission source comprising;
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a data medium for receiving emission data collected from one of an analyser and a transmitter, the emission data including one of a pressure, a temperature, and an amount of a particular material emitted from the emission source; and
means for calculating an amount of the particular material emitted from the emission source using a mass flow rate value, where the means for calculating an amount of the particular material emitted from the emission source calculates a concentration of the particular material using a dilution ratio as follows;
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14. A system for use with an emission source comprising:
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a data medium for receiving emission data collected from one of an analyzer and a transmitter, the emission data including one of a pressure, a temperature, and an amount of a particular material emitted from the emission source; and
means for calculating an amount of the particular material emitted from the emission source using a mass flow rate value, wherein the means for calculating an amount of the particular material emitted from the emission source calculates an concentration of the particular material using a dilution ratio; and
a dilution probe connected to an analyzer, the analyzer connected in communication with the means for calculating a total amount of a particular material.
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15. A system for use with an emission source comprising:
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a data medium for receiving emission data collected from one of an analyzer and a transmitter, the emission data including one of a pressure, a temperature, and an amount of a particular material emitted from the emission source; and
means for calculating an amount of the particular material emitted from the emission source using a mass flow rate value, wherein the means for calculating includes a data analyzer that is adapted for use with an existing plant data handling and acquisition system. - View Dependent Claims (16)
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17. A method for calculating an amount of a material emitted from a source, comprising the steps of:
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sensing an emission gas emitted from the source;
determining a mass flow rate value of the emission gas;
calculating a dilution ration based on the determined mass flow rate value of the emission gas; and
determining a characteristic of the emission gas using the calculated dilution ratio, wherein the step of sensing includes using a dilution probe configured to receive a sample gas that includes the emission gas and a dilution gas. - View Dependent Claims (18, 19, 20)
where D is the dilution ratio, Fda is a mass flow of dilution gas, Tstack is an emission gas temperature, M is the molecular weight of the sample gas, y is a constant, Pabsolute is total emission source pressure, and β
is a thermal expansion coefficient of an orifice material of the dilution probe.
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19. The method of claim 17, wherein the step of calculating a dilution ratio includes calculating the dilution ratio as follows:
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20. The method of claim 17, wherein said step of determining a mass flow rate includes determining the mass flow rate as follows:
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where mc is a mass flow rate of emission gas, is a constant, Cd is a discharge coefficient, Pabsolute is total emission gas pressure, M is a molecular weight of the sample gas, β
is a thermal expansion coefficient of an orifice material of the dilution probe, Ao is a throat area of a critical orifice of the dilution probe, and Tstack is an emission gas temperature.
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21. A method for calculating an amount of a material emitted from a source, comprising the steps of:
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sensing an emission gas emitted from the source;
determining a mass flow rate value of the emission gas;
calculating a dilution ratio based on the determined mass flow rate value of the emission gas; and
determining a characteristic of the emission gas using th calculated dilution ratio, wherein the step of calculating includes providing a data analyzer to perform the calculation of the dilution ratio, the data analyzer being capable of retrofitting in an existing data handling and acquisition system at an industrial facility.
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22. An emission measuring device comprising:
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an analyzer that is capable of measuring a characteristic of an emitted material that is emitted from an emission source; and
a data system connected to the analyzer and configured to calculate an amount of a particular material contained in the emitted material by using a molar flow rate value, wherein the data system calculates a concentration of the particular material using a dilution ratio, and the dilution ratio is calculated as follows;
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Specification