System for synchronously recovering carbon dioxide and nitrogen from boiler flue gas in coal-fired power plant

Abstract

The invention relates to the technical fields of flue gas purification and utilization, and in particular relates to a system for synchronously recovering carbon dioxide and nitrogen from coal-fired boiler flue gas. The system for synchronously recovering the carbon dioxide and the nitrogen from the boiler flue gas in a coal-fired power plant comprises a flue gas pretreatment system, a PSA1 system, a PSA2 system, a carbon dioxide compression purification system, a carbon dioxide rectification storage system and a PSA high-purity nitrogen preparation system. The system for synchronously recovering the carbon dioxide and the nitrogen from the coal-fired boiler flue gas provided by the invention can greatly reduce carbon emission of the flue gas, simultaneously recover the carbon dioxide andnitrogen in the flue gas, and purify the carbon dioxide and the nitrogen to industrial-grade concentrations, the industrial-grade carbon dioxide can be liquefied and stored in finished-product tanks,bottling pumps and loading pumps are arranged to conveniently transport the carbon dioxide to outside in various forms, and the obtained industrial-grade nitrogen can be further pressurized as neededfor centralized use in a industrial park; and the system has high equipment operation stability, and is not easy to block and easy to maintain.

Description

technical field [0001] The invention relates to the technical field of flue gas purification and utilization, in particular to a system for synchronously recovering carbon dioxide and nitrogen from flue gas of a coal-fired boiler. Background technique [0002] With the development of industrialization, my country's carbon dioxide emissions as waste gas have exceeded 10 billion tons per year. The main sources of carbon dioxide are natural gas extraction and combustion, synthetic ammonia production, petroleum refining industry, steelmaking industry, boiler combustion, coke and heavy oil combustion. Excessive carbon dioxide emissions will cause the greenhouse effect and bring great harm to the environment. Therefore, the control of carbon dioxide emissions, and the recovery and utilization of the emitted carbon dioxide have become issues of great concern to countries all over the world. Nitrogen is a gas with a large compression coefficient and volume coefficient, and its sol...

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Problems solved by technology

However, the device does not fully treat carbon dioxide and nitrogen during use. Although the capture effect is good, it cannot purify carbon dioxide and nitrogen, and the equipment is prone to clogging during use, and it is inconvenient to maintain after clogging

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