Purification technology for side product of flue gas ammonia-desulphurization
A technology of ammonia desulfurization and by-products, which is applied in the field of flue gas ammonia method, can solve the problems affecting the quality of by-products, achieve the effects of improving gas mixing efficiency, prolonging the cycle of backwashing, and improving the filtering effect
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Embodiment 1
[0044] 1. Solid-liquid separation: 20-50% of the total amount of room temperature air from the bottom of the desulfurization tower (the total volume percentage of room temperature air required to fully oxidize ammonium sulfite and ammonium nitrite in the absorption liquid is 100%), combined with the absorption liquid The ammonium sulfite and ammonium nitrite in the solution are partially oxidized, and then the absorption liquid (solid phase content 5-10% by mass) is transported to the heating and dissolving tank by the delivery pump, and part of the flue gas (such as the low-sulfur section flue gas temperature (Generally 180-200°C) Indirectly heated to 75-90°C, the flue gas after heat exchange is sent back to the desulfurization tower; the heated absorption liquid is sent to the oil and slag removal tank for standing, and then settles and stratifies to form an oil phase and dissolve The water phase and solid-liquid mixed phase with ammonium sulfate and ammonium sulfite, skim o...
Embodiment 2
[0048] In step 1, steam is used to directly heat the absorption liquid; in step 2, the solid-liquid mixture filtered by the filter membrane is returned to the oil and slag removal tank for standing and then settled for separation, and the gas phase obtained in steps 2 and 3 is directly discharged, and the rest With embodiment 1.
Embodiment 3
[0050] In step 2, the solid-liquid mixture part (50% by weight) filtered by the filter membrane is returned to the oil and slag removal tank for standing and then settled for separation, and part is sent to the filtration system for filtration. All the other are with embodiment 1.
[0051] Reactor Example:
[0052] refer to image 3 and Figure 4 , the top of the cylinder 1 is provided with an exhaust port 2, and the bottom is provided with a sewage outlet 3, and the cylinder 1 is provided with a filter membrane assembly 6 along the center of the axis, referring to Figure 5 , the filter membrane assembly 6 is composed of multilayer membrane tubes 6.1, membrane tube drain frame 6.2 and clear liquid outlet 6.3 which are connected to each other. The membrane tubes in the multilayer membrane tubes are hollow fiber membranes, and the membrane aperture range is 0.05- 0.5 μm. In this embodiment, the filter membrane assembly 6 includes two groups arranged vertically along the axi...
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