US 9,808,762 B2Granted

Predictive emissions monitor systems and methods

AssigneeRockwell Automation Technologies, Inc.

InventorsWalter Edgar Hayes, IV, Keith Alex Smith, Eugene Boe, Dennis Tzyy-nian Yieh

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Abstract

One embodiment of the present disclosure describes an industrial system, which includes a control system with a predictive emissions monitoring system that facilitates determining a chemical level output from a selective catalytic reduction unit that reduces the chemical level in gaseous emissions produced by a combustion source using a selective catalytic reduction model. The control system tunes the selective catalytic reduction model by determining tuning parameters based at least in part on vendor information and tuning data determined via a tuning sequence. The tuning sequence includes operating the combustion source at a plurality of load levels, injecting a reactant into received gaseous emissions at each of the plurality of load levels in accordance with an injection rate provided in the vendor information; and determining an input chemical level to and an output chemical level from the selective catalytic reduction unit at each of the plurality of load levels.

Claims11

Dependent claims

A method for operating a selective catalytic reduction unit, comprising:

tuning, using a control system, a selective catalytic reduction model to the selective catalytic reduction unit to describe expected relationship between operational parameters of the selective catalytic reduction unit and level of nitrogen oxide output from the selective catalytic reduction unit, wherein tuning the selective catalytic reduction model comprises:
instructing a combustion source that produces gaseous emissions comprising nitrogen oxide to operate at each of a plurality of load levels;
instructing the selective catalytic reduction unit to inject a reactant into the gaseous emissions output from the combustion source while operating at each of the plurality of load levels in accordance with an injection rate provided in vendor information;
determining an input nitrogen oxide level to and an output nitrogen oxide level from the selective catalytic reduction unit at each of the plurality of load levels;
and
determining tuning parameters of the selective catalytic reduction model based at least in part on the input nitrogen oxide level, the output nitrogen oxide level, and the injection rate of the reactant at each of the plurality of load levels;
and
after tuning the selective catalytic reduction model to the selective catalytic reduction unit:
predicting, using the control system, the level of nitrogen oxide expected to be output from the selective catalytic reduction unit based at least in part on the operational parameters of the selective catalytic reduction unit and the selective catalytic reduction model;
and
controlling, using the control system, operation of the selective catalytic reduction unit based at least in part on the level of nitrogen oxide expected to be output from the selective catalytic reduction unit;
wherein tuning the selective catalytic reduction model comprises removing a sensor used to determine the output nitrogen oxide level at each of the plurality of load levels after determining the tuning parameters of the selective catalytic reduction model.

9 more elements

A method for utilizing a selective catalytic reduction model, comprising:

tuning the selective catalytic reduction model to a selective catalytic reduction unit configured to process nitrogen oxide produced by a combustion source, wherein tuning the selective catalytic reduction model comprises:
instructing the combustion source to operate at a plurality of load levels;
determining an input nitrogen oxide level to and an output nitrogen oxide level from the selective catalytic reduction unit at each of the plurality of load levels;
determining an injection rate of a reactant in the selective catalytic reduction unit at each of the plurality of load levels;
determining tuning parameters of the selective catalytic reduction model based at least in part on the input nitrogen oxide level, the output nitrogen oxide level, and the injection rate of the reactant determined at each of the plurality of load levels;
and
removing a sensor used to determine the output nitrogen oxide level at each of the plurality of load levels after determining the tuning parameters of the selective catalytic reduction model;
and
controlling, using a control system, operation of the selective catalytic reduction unit based at least in part on amount of nitrogen oxide released from the selective catalytic reduction unit determined using the selective catalytic reduction model.

6 more elements

Dependencies are inferred from the claim text.