Oxygen-enriched combustion boiler system and operation method thereof

Abstract

The invention discloses an oxygen-enriched combustion boiler system and an operation method thereof. The oxygen-enriched combustion boiler system is capable of meeting the emission standard and retarding device corrosion. A denitration device is arranged between a tail part flue of the oxygen-enriched combustion boiler system and a preheater; a heat radiation smoke outlet of the preheater is connected with a heat radiation smoke inlet of a smoke heat exchanger through a dust remover; a heat radiation smoke outlet of the smoke heat exchanger is connected with a desulfurization device and a smoke cooler in sequence and is then returned to a heat absorption smoke inlet of the smoke heat exchanger; a part of the primary air of a combustor is fed into the combustor through a primary air oxygen injector after passing through the preheater and the rest part of the primary air of the combustor is used for pulverizing; the secondary air of the combustor enters the preheater through a secondary air oxygen injector and then is fed into the combustor. The operation method of the oxygen-enriched combustion boiler system emphatically controls the content of water vapor in recycling smoke and the circulation ratio of the recycling smoke and independently adjusts the oxygen injection ratios and amounts of the primary air and the secondary air. The oxygen-enriched combustion boiler system is environment-friendly and easy to implement, and has both oxygen injection safety and economy performances.

Description

technical field [0001] The invention relates to a boiler, in particular to an oxygen-enriched combustion boiler system and its operating method. Background technique [0002] Carbon dioxide is generally considered to be one of the important causes of global warming due to its greenhouse effect. Fossil energy use is the most important CO 2 Sources of emissions. If the global greenhouse gas emissions are counted by industry, the power generation industry is the largest source of emissions, and coal-fired power generation is the largest source of CO2 emissions in the power generation industry. 2 The largest source of emissions, oxyfuel combustion is a CO 2 emissions reduction solutions. [0003] The oxygen-enriched combustion method is based on the existing power plant boiler system, replacing the conventional combustion-supporting air with a gas containing high concentration of oxygen, and at the same time recirculating the flue gas to obtain CO with a volume concentration ...

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Problems solved by technology

[0004] However, the following problems appeared in the oxygen-enriched combustion operation test: first, the NOx concentration in the flue gas will exceed the national environmental protection emission standards, and second, the corrosion of the flue gas duct, furnace, heating surface, etc.

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