A combustion system capable of operating with recycle of combustion gas

JP2025519550A5Pending Publication Date: 2026-05-22カーボダウン
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
カーボダウン
Filing Date
2023-06-05
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing oxy-fuel combustion systems with combustion gas recycling face challenges such as uncontrollable combustion temperatures, risks of sudden combustion stops, and high costs associated with CO2 capture, particularly due to the difficulty in separating nitrogen and carbon dioxide from combustion flue gases.

Method used

A combustion system that operates in two modes: conventional combustion and oxygen combustion with recycle. This system includes a mixer, a molecular oxygen-rich gas supply, a recycling loop with a recycling valve and a bypass, and a control unit that adjusts the flow rates and valve positions to switch between modes, ensuring controlled combustion and efficient CO2 capture.

Benefits of technology

The system achieves controlled combustion temperatures, reduces the risk of sudden combustion stops, and facilitates efficient CO2 capture by recycling combustion gases, thereby lowering operational costs and environmental impact.

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Abstract

The combustion system includes a bypass (6) that opens to ambient air during two different operating modes (M1 “conventional combustion”; M2 “oxy-fuel combustion”), the bypass (6) having the function of introducing air into the recycle loop (40) when the discharge valve (V3) is at least partially open and the recycle valve (V2) is open or closed, and discharging an excess (G2) of the combustion gas (G) generated by the combustion device (1) from the recycle loop (40) and supplying another fraction (G1) of the combustion gas (G) generated by the combustion device (1) to the mixer (31) when the discharge valve (V3) is closed and the recycle valve (V2) is open.
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