US 2025/0075908 A1Published application

Combustion system with ultralow nox emission and rapid fuel mixing method

AssigneesFct Holdings Pty Ltd, Fct Combustao Brasil Importacao E Exportacao Ltda

InventorDavid James RETALLACK

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Abstract

This relates to a combustion system (10) using rapid mixing fuel gas method with combustion air to obtain intense mixture of air flow with strong rotational components with a plurality of gas jets being discharged for this flow. The assembly of the combustion system (10) includes an external body provided with an air inlet and mounting flanges. The external body (12) is connected to the conical outlet element (18) and further to the combustor with cylindrical shape (20). The combustion system (10) further includes the fuel set comprised by two coaxial tubes (24) and (26) with curved swirl fins (42) and gas injectors (48). This assembly is placed inside the external body (12) along the burner axis with the fins (42) being positioned close to the conical element inlet (18). The combustion system operates using a rapid mixing method, with the fuel gas jets injected and regularly distributed in the combustion air flow with high intensity rotational components.

Claims15

Dependent claims

A COMBUSTION SYSTEM WITH ULTRALOW NOX EMISSION comprising an external body with cylindrical shape with the mounting flanges arranged on the inlet and outlet openings;

said external body being equipped with an air entry having rectangular or cylindrical or any other appropriate shape to deliver the combustion air to the external body;
which includes a plurality of fins distributed on the external face of the external tube, which comprises a plurality of orifices;
wherein each fin comprises at least three fuel gas (FG) injectors, which are mounted on the corresponding orifices communicant with the annular space;
each injector having a plurality of openings which discharge the fuel gas (FG) in the combustion air flow under the pre-arranged angles;
said fuel gas injectors being positioned inside the air passages and supported in the direction of the curvature surface of the fins;
the fuel discharge openings being positioned in an aerodynamic cavity with lower pressure due to the curvature of the fins;
said discharge openings of the injectors being duly distributed so that the gas jets (GJ) are evenly discharged, from the bottom to the top of the passage, in the air current that flows through the passage between the fins.

4 more elements

A RAPID FUEL MIXING METHOD, comprising a rapid mixing method with elevated excess air to produce ultralow NOx emission which comprises:

phase 1—supply of combustion air to the external body which flows through the passages of the fins forming an air current with intense rotational components;
fuel gas being provided through the annular channel which is formed by two coaxial tubes;
the external tube having perforations, and over these perforations gas injectors are installed;
each injector having orifices which discharge the gas in the combustion air current;
phase 2—the fuel gas flows through the openings of the injectors and is discharged in the passages of the fins of a turbulator to be evenly distributed around the circumference and within the rotational air flow, and further to mix rapidly and completely thereto;
phase 3—the completely mixed mixture is subsequently inflamed and stabilized in the conical element and next in a combustor;
the stabilization mechanism is by means of the recirculation of hot combustion products moving in the opposite direction of the flame from the combustor into the conical element;
said hot combustion products will constantly relight the mixture of fuel gas/air originating from the passages of the fins;
phase 4—the nature of the flame stabilization is a reignition aerodynamic effect.

6 more elements

Dependencies are inferred from the claim text.