US 11,898,502 B2 · System and methods for improving combustion turbine turndown capability

Abstract

Combustion turbine control systems are configured to operate combustion turbine systems in partial or no load while meeting emission targets. The combustion turbine system includes a combustion turbine, an electrical generator, a combustion turbine controller, a catalyst assembly, and/or other relevant equipment. Based on given operating constraints, such as load conditions and emission regulations, the combustion turbine controller may execute corresponding actions to control certain gas concentrations and/or gas mass flows in the exhaust gases in compliance with emission regulations. The corresponding actions may include, but are not limited to: controlling fuel and/or diluent injection(s) to combustor(s) to control combustion (e.g., combustion temperature) to manage combustion gas contents exiting from the combustor, controlling compressor bleed valve(s) to control the combustion temperature, controlling the catalyst assembly to process exhaust gases to be released into the environment, or a combination thereof.

Claims19

Dependent claims

A method, comprising:

receiving an indication that a combustion turbine is to operate in a partial or no load condition;
responsive to receiving the indication, operating the combustion turbine in the partial or no load condition, thereby generating exhaust emissions;
increasing a combustion temperature in the combustion turbine in the partial or no load condition to increase a concentration of nitrous oxides (NOx) in the exhaust emissions and to reduce a concentration of carbon monoxide (CO) in the exhaust emissions while maintaining an exhaust gas temperature and an exhaust emissions profile of a minimum load condition in which the combustion temperature is not increased;
and
increasing catalyzation in a catalyst assembly to treat emission gases to compensate for increased emission gases during the partial or no load condition by changing temperature of an input to the catalyst assembly.

2 more elements

A system, comprising:

a combustion turbine;
a plurality of sensing devices;
a catalyst assembly configured to treat emission gases from the combustion turbine to meet emission targets;
and
a controller configured to execute a plurality of actions to control gas concentrations and gas mass flows in the emission gases in compliance with emission targets, wherein the plurality of actions comprises:
receiving an indication that the combustion turbine is to operate in a partial or no load condition;
based at least in part on the indication, determining operation parameters corresponding to the partial or no load condition;
operating the combustion turbine in the partial or no load condition using the operation parameters, wherein adjusting the operation of the combustion turbine comprises increasing a combustion temperature of the combustion turbine by reducing a diluent flow into a chamber of the combustion turbine, increasing the combustion temperature results in an increase in a concentration of nitrous oxides (NOx) in exhaust emissions, and wherein adjusting the operation of the combustion turbine comprises increasing catalyzation in the catalyst assembly by increasing injection of a reductant or changing temperature of the reductant to treat the increase in the concentration of the nitrous oxides (NOx);
utilizing the plurality of sensing devices to measure performance-related parameters of the combustion turbine;
and
adjusting the operation of the combustion turbine based at least in part on the performance-related parameters during the operation in the partial or no load condition.

8 more elements

Dependencies are inferred from the claim text.

System and methods for improving combustion turbine turndown capability

Life of this patent

System and methods for improving combustion turbine turndown capability

Life of this patent

Abstract

Claims19