Method and apparatus for collecting carbonic anhydride in coal-fired plant flue gas

Abstract

The invention provides a method and a device for collecting carbon dioxide in smoke gas of a coal-fired power plant. The device consists of a smoke gas pretreatment system, absorption towers, a regeneration tower, an exhaust scrubbing system, a solution heating recoverer, a product gas processing system (comprising a condenser, a gas-liquid separator and a compressor). The device is integrated with the prior smoke gas purification device of the coal-fired power plant, and is provided with a high-efficiency whirlcone and a chemical absorption system, so that mass carbon dioxide gas exhausted from a coal-fired boiler can be collected, and the emission of greenhouse gas can be reduced; the special arrangement of double absorption towers ensures more flexible operation of a collecting system, and improves the operational reliability; an absorption solution reclaiming process reduces the consumption of the solution; the arrangement of a lean-rich solution heat exchanger and a product gas rich solution heat exchanger reduces the energy consumption of the collecting system; and the steam consumption can be effectively reduced by adopting a built-in solution boiling unit.

Description

technical field [0001] The invention belongs to the field of flue gas purification and greenhouse gas emission reduction, in particular to a method and device for capturing carbon dioxide in the flue gas of a coal-fired power plant Background technique [0002] Carbon dioxide emissions from coal-fired power plants are the most important source of greenhouse gas emissions in my country, accounting for about half of my country's total carbon dioxide emissions. In recent years, with the rapid expansion of thermal power installed capacity, the absolute quantity and relative proportion of carbon dioxide gas emissions from coal-fired power plants will further increase. Therefore, the emission reduction of carbon dioxide gas will be one of the bottlenecks for the sustainable development of coal-fired power generation in my country in the future. Due to my country's energy structure dominated by coal-fired power generation and the long-term investment in coal-fired power generation...

AI Technical Summary

Problems solved by technology

Nitrogen oxides (NOx x ), sulfur oxides (SO x ), dust, etc., and these components can be ignored in carbon dioxide capture processes such as natural gas and synthetic ammonia, which means that the current carbon dioxide capture process in the chemical industry cannot be applied to carbon dioxide capture in flue gas of coal-fired power plants

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