A method for carbon capture of ammonia flue gas and synthesis of chemical products
A chemical product and carbon capture technology, applied in the field of flue gas purification, can solve the problems that cannot be directly and effectively used, and achieve the effect of reducing carbon emissions, reducing emission values, and increasing production
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Embodiment 1
[0053] Such as figure 2 As shown, the flue gas produced by the power plant undergoes dedusting, desulfurization and other processes, and all flue gas enters the bottom of the absorption tower 3. The liquid ammonia enters the dilution tank 2 from the ammonia tank 1 to be diluted into 10% ammonia water. The ammonia water is pre-added to the absorption tower 3 to react with the flue gas entering from the bottom. The ammonia water passes through the absorption liquid circulation pipeline 12 to the spray device, and the ammonia water is sprayed further Decarbonize the overflowing flue gas. When the pH of the absorption liquid drops to 9.3, the ammonia tank 1 is opened to add ammonia to the absorption tower 3, and when the pH is close to 12, the ammonia tank 1 is closed to stop adding ammonia. Monitor the pH value in the absorption tower, and maintain the pH in the absorption solution within the range of 9.3-11.5 by adjusting the amount of ammonia added. Until the reaction was term...
Embodiment 2
[0055] Such as figure 1 As shown, the concentrated ammonia water enters the dilution tank 2 from the ammonia water tank 1 to be diluted into 15% ammonia water, and the ammonia water is pre-added to the absorption tower 3. The flue gas passes through the steps of dust removal and desulfurization, and 70% of the flue gas enters the side wall of the absorption tower 3. The flue gas inlet position is above the liquid level. The ammonia water passes through the absorption liquid circulation pipeline 12 to the spraying device, and the carbon dioxide in the flue gas is removed by spraying the ammonia water and the flue gas in reverse convection. The decarburization efficiency of the absorption tower is 82%. When the pH of the absorption liquid drops to 9.3, the ammonia tank 1 is opened to add ammonia to the absorption tower 3, and the pH reaches 11.5, and the ammonia tank 1 is closed to stop adding ammonia. Monitor the pH value in the absorption tower, and maintain the pH range of 9.3...
Embodiment 3
[0059] The reaction in the carbonization tower is simulated under the experimental conditions. The carbonization tower contains 1L of ammonium carbonate solution with a concentration of 7.25mol / L, the solution contains 2% ammonia water, and sodium sulfate particles are added to the solution until the solution is saturated. Into the flue gas, the liquid-gas ratio (L / G) is 0.40, and the CO 2 The partial pressure is 45KPa. The spray volume of the intermediate mother liquor is 3L / min. The pH of the carbonization mother liquor is in the range of 8.5-9.5, and the reaction temperature is 40°C. Continuous production is carried out to obtain the product sodium bicarbonate. The final carbon conversion rate reaches 34.23% (the carbon conversion rate is the ratio of the product to the carbon content of the flue gas entering the tower), where CO 2 The absorption efficiency is about 26%.
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