Combustor and gas combustion method

Abstract

The invention discloses a combustor and a gas combustion method. The combustor comprises a mixer with a combustion-supporting gas inlet and a first gas inlet, gas mixture nozzles communicated with the mixer, a second gas inlet and gas nozzles. Gas comprises a first part gas and a second part gas, wherein the first part gas enters the mixer and is premixed with all combustion-supporting gas to form a gas mixture; the gas mixture is injected through the gas mixture nozzles into a device to be heated for primary combustion; smoke is generated at the same time; since a gas concentration in the gas mixture is lower and a combustion temperature is also lower, the generation of a thermal oxynitride is avoided. The second part gas is injected through the gas nozzles into the device to be heated and mixed with the smoke for secondary combustion; since an oxygen concentration is lower during the secondary combustion, the generation of the oxynitride can be inhibited; after twice combustion, the residual oxygen concentration in the smoke is lower; a heat loss of the smoke is small; the operating cost is low.

Description

technical field [0001] The invention relates to the field of industrial burners, and more specifically, to a burner and a gas combustion method. Background technique [0002] An industrial burner is a device that mixes fuel and assisted gas in a certain way and sprays it out to make the fuel burn and release heat. It can be used for heating industrial furnaces, boilers and other devices. [0003] In order to achieve low nitrogen emissions, the existing burners will independently adopt technologies such as staged combustion, lean-burn premixing and flue gas recirculation. Among them, the staged combustion method alone cannot achieve ultra-low nitrogen; the flue gas recirculation method has problems such as combustion instability, the efficiency of the exhaust gas temperature rises, and the condensed water generated by flue gas cooling affects the service life of the fan and burner. The lean-burn premixing method represented by the mixed surface combustion method has problems...

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Problems solved by technology

Among them, the staged combustion method alone cannot achieve ultra-low nitrogen; the flue gas recirculation method has problems such as unstable combustion, low efficiency of exhaust gas temperature, and condensed water generated by flue gas cooling, which affects the service life of fans and burners; The lean-burn premixing method represented by the mixed surface combustion method has problems such as easy blockage of the combustion head and filter screen, unsafe tempering, large excess air (oxygen concentration in the combustion product is higher than 5%), and low efficiency.

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