A method of carbon dioxide capture and molten salt regeneration using molten salt
A carbon dioxide and carbon dioxide removal technology is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc. It can solve problems such as difficult operation, high absorption temperature, and easy deactivation of calcium absorbents, and achieves a wide range of applications. Effect of improving absorption performance and extending service life
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Embodiment 1
[0043] refer to figure 1 : Coal combustion flue gas with a volume fraction of 17% of carbon dioxide is passed into a carbon capture reactor to react and absorb carbon dioxide in the gas at 700°C, and the molten salt mixture used includes 20% of calcium oxide in mass fraction , 10% sodium hydroxide and 70% sodium carbonate, the equivalent diameter of CaO is 0.01mm. The stoichiometric ratio between the amount of the molten salt mixture and the carbon dioxide entering the carbon capture reactor per unit time is 3, and the content of carbon dioxide in the flue gas after the coal combustion flue gas is treated by the molten salt is 0.1%. The molten salt mixture after absorbing carbon dioxide is regenerated by high-temperature decarbonation at 1100°C; the molten salt mixture with a mass fraction of 35% after the reaction enters the molten salt regeneration reactor through the molten salt regeneration pump, and is regenerated by causticizing method. The pure carbon dioxide produced ...
Embodiment 2
[0045] Referring to Example 1, the difference is that the flue gas containing carbon dioxide with a volume fraction of 12% of biomass direct combustion power generation is passed into the carbon capture reactor, the temperature of the injected molten salt is 500°C, and the reaction absorbs at 500°C The carbon dioxide in the gas and the molten salt mixture used include 10% calcium oxide, 5% sodium hydroxide and 85% sodium carbonate in terms of mass fraction. The equivalent diameter of CaO is 0.02 mm. The stoichiometric ratio of molten salt consumption to carbon dioxide entering the carbon capture reactor per unit time is 2. The content of carbon dioxide in the flue gas after absorption is 1%. The molten salt mixture after absorbing carbon dioxide is regenerated by high temperature decarbonation at 1000°C.
Embodiment 3
[0047] With reference to Example 1, the difference is that: the coal combustion flue gas containing carbon dioxide with a volume fraction of 15% is passed into the carbon capture reactor, the temperature of the injected molten salt is 350°C, and the reaction absorbs the carbon dioxide in the gas at 350°C Carbon dioxide, the molten salt mixture used, includes 30% calcium oxide, 15% sodium hydroxide and 55% sodium carbonate in terms of mass fraction. The equivalent diameter of CaO is 0.1mm. The content of carbon dioxide in the flue gas after absorption is 1%. The molten salt mixture after absorbing carbon dioxide is regenerated by high temperature decarbonation at 1200°C.
[0048] from figure 2 It can be seen that the strong metal base in the molten salt mixture and the mixture of alkali metal salts can absorb carbon dioxide automatically at 350°C to 850°C. In fact, the mixture of metal strong base and alkali metal salt in the molten salt mixture has a faster chemical reacti...
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