Device for desulfurizing flue gas by seawater through membrane absorption and its process
A desulfurization device and membrane absorption technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of uneven distribution of absorption liquid and flue gas, difficulty in engineering application, high operation and maintenance costs, and achieve High seawater utilization rate, stable desulfurization efficiency, strong resistance to flue gas SO2 concentration and flow impact
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Embodiment 1
[0100] use as figure 1 In the membrane absorption seawater flue gas desulfurization process shown, the desulfurization core part of the device consists of three stages such as Figure 11 The box-type gas-liquid contacting membrane absorbers shown are assembled in series and installed horizontally. The hollow fiber membrane filling area of each stage membrane absorber is 500m 2 , the film packing density is about 9%; the original seawater is used as the absorption liquid, its conductivity is 47400μS / cm-51800μS / cm, the pH value is 7.45-8.22, and the temperature is normal temperature; the actual coal-fired flue gas is used, and its SO 2 Concentration 1000mg / Nm 3 ~1600mg / Nm 3 , soot concentration 100mg / Nm 3 , the temperature is 130°C to 150°C, and before entering the membrane absorber, the temperature is lowered to below 50°C through a heat exchanger. Control the total flow of seawater 5m 3 / h~25m 3 / h, using parallel connection to flow through the three-stage membrane ab...
Embodiment 2
[0102] Adopt the same process, device and absorption liquid as above-mentioned embodiment 1, flue gas is SO 2 The concentration is 2860mg / Nm 3 and 4290mg / Nm 3 The high concentration of actual coal-fired flue gas, the seawater flow rate is controlled to 15m 3 / h, the pH value is 8.20~8.51, and the flue gas treatment capacity is 500Nm 3 / h~1300Nm 3 In the range of / h, the corresponding concentration is 2860mg / Nm 3flue gas, the desulfurization rate is 97.7%-88.5%, and the pH value of seawater after desulfurization is 3.3-5.5; the corresponding concentration is 4290mg / m 3 flue gas, flue gas treatment capacity ≤ 1000Nm 3 In the case of / h, the desulfurization rate is 97.1%-90.6%, and the pH value of seawater after desulfurization is 2.7-5.0. flue gas SO 2 Concentration at 1000mg / Nm 3 ~4290mg / Nm 3 Fluctuation within the range, flue gas treatment capacity ≤ 1000Nm 3 / h, the desulfurization rate reached above 90%. Membrane fouling control in gas phase and liquid phase and p...
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