Ammonia flue gas desulfuration and denitration combined process and device
A flue gas and process technology, applied in the direction of separation method, ammonium sulfate, climate sustainability, etc., can solve the problems of reducing oxidation rate and desulfurization efficiency, and achieve the effect of promoting denitrification, improving purity, and promoting natural oxidation rate
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[0056] Example 1
[0057] In a thermal power plant, 3 sets of 220t / h boilers adopt this desulfurization and denitration process, and the liquid-to-gas ratio of the desulfurization tower is 8L / Nm 3 , The pH value of the desulfurization tower is controlled at 5.0-8.0, the pH value of the pre-scrubbing tower is controlled at 2.8-3.8, the supply of lime emulsion and F in the flue gas - The molar ratio is 1.3:1, the height of each layer of filler is controlled at 60cm, the pore size of the air distribution plate is 3-5mm, and the distance between the two layers of air distribution plate is 2m; the inlet SO 2 The concentration is 5789mg / m 3 , NO concentration is 352mg / m 3 , The flue gas temperature is 142℃, the outlet SO 2 The concentration is 25mg / m 3 , NO concentration is 12mg / m 3 , The purity of ammonium sulfate is 99.8%, and the ammonium sulfate crystal size range is 1-3mm.
Example Embodiment
[0058] Example 2
[0059] In a self-provided power plant, a 300WM unit adopts this desulfurization and denitration process, and the liquid-to-gas ratio of the desulfurization tower is 7L / Nm 3 , The pH value of the desulfurization tower is controlled at 6.5-8.0, the pH value of the pre-scrubbing tower is controlled at 3.0-4.0, the supply of lime emulsion and F in the flue gas - The molar ratio is 1.5:1, the height of each layer of filler is controlled at 50cm, the pore size of the air distribution plate is 3-5mm, and the distance between the two layers of air distribution plate is 2m; the inlet SO 2 The concentration is 4672mg / m 3 , NO concentration is 421mg / m 3 , The flue gas temperature is 152℃, the outlet SO 2 The concentration is 18mg / m 3 , NO concentration is 15mg / m 3 , The purity of ammonium sulfate is 99.7%, and the ammonium sulfate crystal size range is 1mm-3mm.
Example Embodiment
[0060] Example 3
[0061] In a power plant, two 130t / h boilers adopt this desulfurization and denitration process, and the desulfurization tower has a liquid-gas ratio of 9L / Nm 3 , The pH value of the desulfurization tower is controlled at 6.8-7.8, the pH value of the pre-scrubbing tower is controlled at 3.5-4.2, the supply of lime emulsion and F in the flue gas - The molar ratio is 1.2:1, the height of each layer of filler is controlled at 50cm, the pore size of the air distribution plate is 3-6mm, and the distance between the two layers of air distribution plate is 3m; the inlet SO 2 The concentration is 2983mg / m 3 , NO concentration is 378mg / m 3 , The flue gas temperature is 137℃, the outlet SO 2 The concentration is 16mg / m 3 , NO concentration is 8mg / m 3 , The purity of ammonium sulfate is 99.2%, and the ammonium sulfate crystal size range is 1mm-3mm.
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