High-temperature flue gas oxygen-doped type oxygen-enriched combustion steam-injection boiler

Abstract

The invention relates to a high-temperature flue gas oxygen-doped type oxygen-enriched combustion steam-injection boiler. The steam-injection boiler comprises an oxygen-enriched generation device, a combustion improver matching and preheating device, a boiler body, a radiation section, a convection section, a water feeding pump, a water mixer, a steam-water separator, a collecting header and a burner. The oxygen-enriched generation device is connected with the combustion improver matching and preheating device. The radiation section is arranged in an inner cavity of the boiler body. The convection section is arranged on the outer side of the boiler body. The water mixer communicates with the water feeding pump, the convection section and the collecting header. The steam-water separator communicates with the radiation section and the collecting header. The burner communicates with the boiler body and a gas mixing tank. The oxygen-enriched generation device is used for producing pure oxygen, a circulating fan is introduced to pump high-temperature flue gas from the tail portion of the boiler, the pure oxygen and the high-temperature flue gas are directly mixed in the gas mixing tank into an oxygen-enriched combustion improver with the oxygen concentration being higher than the concentration (larger than 21%) of conventional air to be fed into the boiler for supporting combustion, and accordingly fuel burning efficiency can be improved and pollutant emission concentration can be lowered.

Description

technical field [0001] The invention relates to an oxygen-enriched combustion steam-injection boiler for high-temperature flue gas mixed with oxygen for heavy oil development. Background technique [0002] Oilfield steam injection boiler is one of the key equipment for heavy oil exploitation. In order to improve the thermal efficiency of the boiler and save fuel, the currently operating steam injection boilers have adopted various measures, such as using high-efficiency insulation materials, installing flue gas waste heat recovery devices, changing fuel oil to gas, and changing combustion methods, among which the energy-saving effect is remarkable. Oxygen-enriched combustion technology, the energy saving rate is above 4%. Under the condition of oxygen-enriched combustion, the flame temperature increases, the combustion speed increases, the completeness of combustion increases, the ignition temperature of the fuel decreases, the burnout time shortens, the excess air coeffici...

AI Technical Summary

Problems solved by technology

Under the condition of oxygen-enriched combustion, the flame temperature increases, the combustion speed increases, the completeness of combustion increases, the ignition temperature of the fuel decreases, the burnout time shortens, the excess air coefficient decreases, and the amount of smoke decreases; but the biggest problem is NO x Higher emission concentration

This is mainly because: N in the combustion aid 2 Concentration decreases, resulting in thermal NO x The amount of production decreases, but the increase of flame temperature and oxygen concentration can increase the thermal NO x production, and NO x The rate of increase is higher than that of NO x The reduced speed, the final NO x Emissions are still increasing

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