Multi-effect evaporation concentration device and process for sulfuric acid and its salt solution
A multi-effect evaporation and concentration device technology, which is used in heating water/sewage treatment, water treatment parameter control, water/sludge/sewage treatment, etc. to improve economic efficiency, reduce production costs, and reduce evaporation costs.
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Embodiment 1
[0055] Such as figure 1 As shown, the six-effect evaporator is provided with a five-stage preheater 9 , a four-stage preheater 10 , a three-stage preheater 11 , a secondary preheater 12 and a primary preheater 13 .
[0056] The acid feeding process of the acid bath C is as follows: the acid bath C is divided into 6 branches, and flows into the first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3, the four-effect evaporator 4, the five-effect evaporator 5, Six-effect evaporator 6: The acid bath C without preheating by the preheater is divided into four paths and enters the three-effect evaporator 3, the four-effect evaporator 4, the five-effect evaporator 5, and the six-effect evaporator 6; the rest of the acid bath C enters the fifth-stage preheater 9, and uses the condensed water discharged from the fourth-stage preheater 10 and the heated steam condensed water of the five-effect evaporator 5 as heat sources; then enters the fourth-stage pr...
Embodiment 2
[0064] Such as figure 2 As shown, the acid bath five-effect evaporation crystallization is basically the same as the above-mentioned process of embodiment 1, and the flow process of a preheater is missing. The first three effects are evaporators, and the last two effects are four-effect evaporation crystallizer 4' and five-effect Evaporation crystallizer 5'.
[0065] The five-effect evaporating crystallizer 5' does not feed acid, which is for more evaporation and crystallization of sodium sulfate, and the four-effect evaporation crystallizer 4' may not feed or less acid, in order to adjust the amount of crystallization of sodium sulfate; the four-effect evaporation crystallization The 4' of the device is more acid, which can reduce the crystallization of Yuanmingfen. On the contrary, the output can be increased.
[0066] The steam-water ratio of the five-effect evaporation crystallization in the acid bath of the present invention reaches 0.237; the steam-water ratio reaches...
Embodiment 3
[0068] Such as image 3 As shown, the eight-effect evaporation of acidic water, the water intake process of acidic water or two-bath water is designed according to the characteristics of high water temperature and can reach the boiling point of water intake, and the acidic water enters the first five-effect evaporator through five branches: One-effect heating steam condensate water preheating first-effect evaporator 1 water inlet; second-effect heating steam condensate water preheating second-effect evaporator 2 water inlet; three-effect heating steam condensate water preheating three-effect evaporator 3 inlet water; four-effect Heating steam condensed water to preheat four-effect evaporator 4 inlet water; fifth-effect inlet water can reach boiling point inlet water without preheating; sixth-effect, seventh-effect, and eight-effect only accept the parallel flow drainage of the previous effect, not separate water inlet. The design of the water intake is based on the heat that c...
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