Method and device for capturing carbon dioxide in flue gas of power station boiler

Abstract

The invention discloses a method and a device for capturing the carbon dioxide in the flue gas of a power station boiler. The device comprises a denitration, dust-removal and desulfurization system of a flue gas pretreatment system, and main tower equipment such as a water scrubbing tower, an absorption tower and a regeneration tower. The system also comprises a steam supply system, a solution storage tank system, a flue gas drying / absorbing and heat exchange system, a solution absorption-generation system and an amine recovery heater. The method and the device organically integrate a power plant and carbon capture and storage (CCS) into one system, thus effectively utilizing the condition that a great deal of steam is supplied by the power plant, solving the problem that the water balance is destroyed by the flue gas with water entering a decarburization circulating system, and greatly reducing the consumption of a decarburization solvent. A solvent absorption-regeneration circulating system designed for the decarburization solvent is provided with a barren liquor heat exchanger, a barren / rich liquid heat exchanger and a rich liquid heat exchanger, so that the energy utilization efficiency of the system is greatly improved, and the energy consumption of a CCS system is obviously reduced.

Description

technical field [0001] The invention relates to a method and device for capturing carbon dioxide in flue gas of a power station boiler, and belongs to the technical field of flue gas purification and greenhouse gas emission reduction. Background technique [0002] Atmospheric CO 2 , O 3 As well as water vapor and other gases, they can pass through the short-wave radiation of the sun (less absorption), but block the long-wave radiation from the earth's surface to space (absorb more). 2 The increase of isoconcentration will cause the incident energy and dissipated energy to lose balance, and when the fixed energy is more than the energy radiated to space, the temperature of the earth's atmosphere will inevitably increase. This phenomenon is called the greenhouse effect. [0003] Carbon dioxide is the most important considered greenhouse gas, and energy activities are its main source of emissions. According to the Fourth Assessment Report of the Intergovernmental Panel on Cl...

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Problems solved by technology

Chinese patent CN201010001164.8 discloses a carbon dioxide capture system and treatment method in the flue gas of a coal-fired power plant, and a demonstration device with an annual output of 10,000 tons has been built in Shuanghuai Power Plant, Hechuan, Chongqing, China, but the main technology has not been overcome due to the technological process problems, resulting in problems such as high energy consumption, large water consumption and unstable operation during operation

This difficulty severely limits the large-scale carbon capture application of CCS technology in power plants

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