Premixed duct burner

Abstract

A fully premixed duct burner is provided that receives exhaust gas from a power generating device, such as a gas turbine or reciprocating engine. The burner may include a burner surface adapted to combust the mixture on or above the surface in blue-flame mode. Substantially all exhaust gas passes through the burner with the exception of some small fraction of exhaust gas that passes through cooling holes or slots. The burner assembly can also include an array of burner modules that receive substantially all of the exhaust gas and fully premixes the exhaust gas with burner fuel prior to combusting the mixture on or above an array of burner surfaces.

Description

FIELD OF THE INVENTION [0001] This invention generally relates to a premixed duct burner and more particularly, to a premixed duct burner for use with gas turbines or reciprocating engines, which has high thermal efficiency and low NOx emissions. BACKGROUND OF THE INVENTION [0002] Power generating devices, such as gas turbines and reciprocating engines, can be implemented to meet the power requirements of industrial and commercial users. In these types of applications, heat recovery is a desirable goal. Heat recovery is commonly achieved through steam generation and may accomplished by passing hot exhaust gasses generated by a device, such as turbine exhaust gas (TEG), through a waste heat boiler or heat recovery steam generator (HRSG). In the simplest systems, there is no supplemental fuel added to the exhaust. These combined power generation and heat recovery systems are known as “combined heat and power” (CHP) systems. [0003] Improved operating flexibility, higher thermal efficie...

AI Technical Summary

Problems solved by technology

While this approach may keep pressure losses low in some applications, it limits the amount of turbine exhaust that can interact with supplemental fuel, since all of the added fuel can not immediately mix and burn with all of the TEG.

This higher temperature leads to higher NOx emissions.

Brandon does not teach fully premixing the full exhaust stream with fuel, and therefore makes no attempt to minimize stack oxygen in order to maximize thermal efficiency.

This limits the amount of supplemental heat that can be added by the duct burner.

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