Flue gas internal circulation combustor

Abstract

The invention provides a flue gas internal circulation combustor which comprises an ignition gun; a first-stage gas pipe, a second-stage gas pipe, an air flow guide inner cylinder and an air flow guide outer cylinder, wherein the first-stage gas pipe is provided with a first-stage gas nozzle and is arranged on the outer side of the ignition gun in a radial direction; the second-stage gas pipe is provided with a second-stage gas nozzle and is arranged on the outer side of the first-stage gas pipe in the radial direction; the air flow guide inner cylinder is arranged between the first-stage gas pipe and the second-stage gas pipe in the radial direction; the air flow guide outer cylinder is arranged on the outer side of the air flow guide inner cylinder in the radial direction; and the air flow guide inner cylinder and the air flow guide outer cylinder form a Venturi structure, the Venturi structure sequentially comprises a contraction section, a throat section and a diffusion section in a flowing direction of air in the Venturi structure, and a flue gas circulation opening is formed in the throat section of the air flow guide outer cylinder. The flue gas internal circulation combustor can strengthen the flue gas internal circulation effect and promotes mixing of fuel gas, combustion-supporting air and flue gas without adding a flue gas external circulation pipeline.

Description

technical field [0001] The present invention generally relates to the technical field of burners, and more specifically relates to a flue gas internal circulation burner. Background technique [0002] With the vigorous implementation of my country's energy-saving and emission-reduction policies, the NOx emission standard of gas burners has been reduced to 30mg / Nm 3 . The low-nitrogen transformation projects nationwide are steadily carried out, and the low-nitrogen burners used are mainly surface burners and flue gas external circulation low-nitrogen burners. Surface burners often use a large excess air coefficient to reduce NOx emissions, which will affect the thermal efficiency of the burner to a certain extent. The flue gas external circulation low-nitrogen burner adds flue gas external circulation pipes and mixes part of the flue gas with combustion-supporting air to achieve low-nitrogen combustion. Not only is the overall equipment more complicated, but the problem of ...

AI Technical Summary

Problems solved by technology

Surface burners often use a large excess air coefficient to reduce NOx emissions, which will affect the thermal efficiency of the burner to a certain extent

The flue gas external circulation low-nitrogen burner adds a flue gas external circulation pipe to mix part of the flue gas with the combustion air to achieve low-nitrogen combustion. Not only is the overall equipment more complicated, but the problem of condensed water in the flue gas circulation pipe is also difficult to solve

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