Lye evaporation
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 20:23 32% alkali liquid is evaporated to 50%, using double-effect countercurrent falling film process, 1.3MPa medium pressure steam, what is the approximate consumption per ton of alkali steam? Most of the data is around 0.78MPa, but there is no steam pressure. Is there any expert who uses the same process? Please enlighten me! This post was last edited by yzhms on 2009-3-20 14:05 ] # + + .
We use three-effect countercurrent falling film evaporation, 1.0MPa steam, 0.6 tons of steam per ton of caustic soda. I made a rough estimate. The steam consumption mentioned by the poster is 0.78 tons/ton, and the steam pressure should be 1.0MPa.
Reply to the 3rd floor, referring to the ion membrane alkali production technology (Editor-in-Chief Cheng Dianbin), >0.7MPa steam, the three-effect evaporation steam consumption of 50% liquid alkali should be between 0.5-0.6 (page 200). Theoretically, the water vapor consumption of 1 ton of double-effect steaming is about 0.6-0.65 (page 188), but the steam pressure is not mentioned here.
Two-effect low-pressure countercurrent falling film evaporation technology production consumption quota (consumption) project BertramsGEAAPVCEPBTCSET steam/(kg/t) 760761700800820708 Three-effect medium-pressure countercurrent falling film evaporation technology production consumption quota project BertramsGEAAPVCEPBTCSET steam/(kg/t) 525527503570606513
Our company has an ion membrane scale of 100,000 tons. We currently use Swiss Bertrams three-effect medium-pressure countercurrent falling film evaporation technology. The production consumption quota is: 540kg/t orosine, through actual operation and exploration, there is still some room for reduction in steam consumption. We are currently exploring and exploring in this regard.
Our company's evaporation alkali production (32%-50%) adopts a double-effect falling film countercurrent process, and consumes 0.75T of steam per ton of alkali.
Double-effect countercurrent gas consumption per ton fluctuates between 0.75 and 0.8
Our company has a scale of 100,000 tons of ion membrane, double-effect downstream falling film evaporation, vacuum degree of 86KPa, 0.85MPa steam, 0.73 tons of steam per ton of caustic soda.
The relationship between the effect number of the evaporator and the steam consumption (theoretically): Single effect, double effect, three effects and four effects steam consumption, t/t caustic soda, 1.10 0.57 0.40 0.30. The steam pressure is generally between 0.8 and 1.0MPa.
The steam consumption is related to the temperature of 32% alkali solution. The steam consumption of the evaporator is relatively low when it comes directly from the battery tank. Usually, the alkali from the battery bath is stored in a relatively large alkali storage tank and then evaporated. At this time, the alkali temperature is low and the gas consumption is relatively large. I don’t know what the temperature of 32% alkali entering the calculated gas consumption is. I think it is much greater than ours. We only have 0.6T steam/ton of alkali?
Is there any company that specifically designs this process? We are also going from 32% to 50%. I don’t know who to look for to design it. I kindly ask for your recommendation.