Cold crude gas heat accumulating type oxygen-enriched combustion method and cold crude gas heat accumulating type oxygen-enriched combustion system

Abstract

The invention relates to a cold crude gas heat accumulating type oxygen-enriched combustion method and a cold crude gas heat accumulating type oxygen-enriched combustion system. The combustion method comprises the steps of transmitting cold crude gas, generating and transmitting mixed oxygen-enriched air, reversing the oxygen-enriched air by an air-smoke reversing valve, heating the reversed oxygen-enriched air in a heat accumulating type burner, mixing the oxygen-enriched air with gas for burning, discharging smoke, and the like; the combustion system comprises a gas system, an air-smoke system and an oxygen system, wherein the tail end of a pipeline of the oxygen system is connected with a dynamic mixer of the air-smoke system; the tail end of a branch behind the air-smoke reversing valve in the air-smoke system is connected with the heat accumulating type burner of the gas system. Compared with the prior art, the method and the system have the beneficial effects that (1) the burning velocity is increased, the tempering is avoided, and the combustion safety is improved; (2) the ignition temperature of fuel and the burn out time are reduced; (3) the excess air coefficient is reduced, and the amount of the smoke after combustion can be reduced; (4) the production of CO2 and NOX can be effectively reduced, so that the environmental protection can be better realized; (5) the system is simple in structure, convenient to operate and high in degree of automation.

Description

technical field [0001] The invention relates to a combustion method and system, in particular to a cold dirty gas regenerative oxygen-enriched combustion method and a combustion system. Background technique [0002] At present, the combustion methods commonly used in metallurgical heating furnaces mainly include conventional combustion and regenerative combustion. According to the needs of energy saving, many steel mills use regenerative combustion in the combustion system when burning medium and low calorific value fuels. The most widely used is the air single regenerative combustion system, relying on the heat absorption and heat release of the regenerator to realize the heat exchange between the high-temperature flue gas and the air, that is, the reversing valve flue gas side is opened, the air side is closed, and the high-temperature flue gas Under the action of the induced draft fan, the gas enters the burner from the furnace, and transfers heat to the heat storage body...

AI Technical Summary

Problems solved by technology

[0004] In a conventional cold dirty gas combustion system, the volume content of oxygen in the combustion air is about 21%, nitrogen 79%, and a small amount of inert gas; the oxygen that actually participates in combustion only accounts for 1 / 5 of the air volume, other gases Does not participate in combustion, and will take away a lot of heat energy during the combustion process, reducing the thermal efficiency of the kiln

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