A high-humidity flue gas deep waste heat recovery and co 2 Capture integrated device and method

Abstract

The invention discloses an apparatus and a method for integrated depth waste heat recovery and CO2 capture of high-humidity flue gas, and belongs to the field of dehumidification and CO2 capture of the flue gas. The apparatus includes a flue gas dehumidification waste heat recovery device and a CO2 adsorption bed. The dehumidification heat recovery device comprises a liquid storage tank, a dehumidification and heat exchange chamber and a liquid collection tank, wherein the height of the dehumidification and heat exchange chamber is 0.3-0.5 m, and a plurality of water cooling tubes having a caliber of 10-20 mm are arranged in the heat exchange chamber in a serpentine manner; a dehumidification solution flows into the dehumidification heat exchange chamber from the liquid storage tank through a funnel-shaped liquid distributor, and descends on the outer walls of the serpentine tubes to form liquid films; the flue gas enters the dehumidification heat exchange chamber and flows among the serpentine tubes, and the wall attachment liquid films absorb moisture in the flue gas, and further realize depth recovery of the sensible heat of the flue gas and the latent heat of the water vapor together with the water cooling tubes and deeply purify impurity dusts; and a dilute solution is collected in the liquid collection tank at the lower part. The obtained dehumidified and cooled flue gasenters the adsorption bed and undergoes CO2 capture, and medium temperature water flowing out of the serpentine tubes enters the buried bed of the adsorption bed, and provides energy for a desorptionprocess in order to enhance CO2 desorption. The apparatus has the advantages of simple and reasonable structure, small occupied area and high integration degree.

Description

technical field [0001] The invention belongs to flue gas dehumidification and CO 2 The field of capture, especially refers to the dehumidification and waste heat recovery of medium and low temperature saturated wet flue gas, deep purification and CO 2 Devices and methods of capture. Background technique [0002] The flue gas emitted from the combustion of fossil fuels used in thermal power plants mainly contains nitrogen oxides, sulfur oxides, dust and water vapor, etc. The volume fraction of water vapor in the flue gas after wet desulfurization is about 13%- 15%, if these dusty and wet saturated flue gases are directly discharged into the atmosphere through the chimney, it will cause the phenomenon of "white smoke" or "chimney rain", accompanied by the corrosion of the chimney pipe, and at the same time aggravate the greenhouse effect and cause environmental pollution. In addition, a large amount of latent heat of water vapor contained in the flue gas and water after cond...

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Problems solved by technology

Adsorption separation and recovery of CO 2 It has the advantages of simple process, low energy consumption, and little environmental pollution. 2 The potential advantages in the field of adsorption and separation have attracted scholars at home and abroad to conduct research, but the presence of moisture in the flue gas makes the existing adsorbents more sensitive to CO 2 Decreased adsorption and separation capacity, complex process, limited industrial scale, and increased recovery costs

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