High-efficiency tail flue gas energy utilization and treatment system of oxygen-enriched combustion boiler

Abstract

The embodiment of the invention provides a high-efficiency tail flue gas energy utilization and treatment system of an oxygen-enriched combustion boiler. The system achieves coupling of an air separator system of the oxygen-enriched combustion boiler with a flue gas recirculation system and a tail flue gas energy recovery and treatment system; a tail flue of the boiler is divided into three parallel flues to adjust recirculating flue gas amount and temperature; the adaptability of the system to a coal type is improved; a low-pressure economizer recovers flue gas waste heat; the oxygen temperature at an outlet of an air preheater is adjusted; the three parallel flues are coupled to increase an adjustment margin of the flue gas temperature. Recirculating flue gas formed by mixing high-temperature flue gas and low temperature recirculating flue gas serves as primary air to avoid blocking of a pulverized coal pipeline due to liquefaction of accumulated steam during flue gas recirculation when the temperature of the primary air is lower; the size of the air preheater is reduced; the cost is saved; and the economy is improved.

Description

[0001] Technical field: [0002] The invention belongs to the field of utilization and treatment of flue gas energy at the tail of a boiler, and particularly designs a highly efficient system for utilization and treatment of flue gas energy at the tail of an oxygen-enriched combustion boiler. [0003] Background technique: [0004] With the intensification of global warming and the frequent occurrence of extreme weather, global attention to greenhouse gas emissions is increasing day by day. For a long period of time in the future, coal will still be used as the main fossil energy. Since China's energy structure is dominated by coal, coal-fired thermal power plants are the main force in China's power industry. In 1952, coal power accounted for 90.4% of my country's total installed capacity and 82.2% of total power generation; although the proportion declined later, coal power still accounted for 74.4% of my country's total installed capacity and 82.2% of total power generation ...

AI Technical Summary

Problems solved by technology

For coal-fired generating units equipped with an independent desulfurization system, excessively high flue gas temperature will carry a large amount of water vapor during desulfurization, increasing desulfurization water consumption

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