On the design of single-effect evaporators
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The material is sodium chloride, with a flow rate of 10 t/h; it is vaporized from 5% to 15%, and the feed temperature is 25°C. What is the typical pressure of the pressurized steam? What is the typical operating pressure of the condenser as well?
The pressure of the pressurized steam is generally set at 0.3 MPa, while the pressure in the condenser is usually determined by the pressure in the separation chamber; it is typically under vacuum
Reply to 2# Person on a Journey-2007: Thank you, but I still don’t quite understand; I’m confused~~~~~~~~
The pressure is applied to around 5 kilograms, above the boiling point of saltwater; the key is to have an effective heat transfer design
Well, let me be the one to tell you about this issue. The solubility of sodium chloride is 36 g/100 g, which corresponds to a concentration of 26%. 5%-15% are all unsaturated solutions, and no crystals will precipitate. The MVR evaporator produced by Jiangsu Leke Thermal Technology Co., Ltd. is the preferred choice – it doesn’t require steam and is the most energy-efficient option. Secondly, if the steam available in the company is relatively inexpensive, a falling film evaporator can be used. The steam coming from thermal power plants has a weight of 6 kilograms; a heat pump can be used to keep its temperature below 120 degrees, with the raw material being preheated to over 95 degrees before being fed in. Of course, the most basic single-effect forced circulation system can also be used; it is the most energy-intensive and therefore not recommended. The operating pressure of the condenser can be controlled by you, depending on the temperature at which you want to condense the steam
It’s not cost-effective to use this equipment for single-effect operation; let our company handle it. I will design an MVR falling-film evaporator for you.
Whether the material can be evenly coated affects the evaporation efficiency directly. The film formers/distributors of tubular and plate evaporators have different structures. Generally speaking, fully welded plate evaporators are easier to coat with a film, and they also yield the best results. Generally, a water ring vacuum pump is installed after the final effect condenser. The selection of such a vacuum pump is primarily based on power parameters, which are determined by factors such as the evaporation temperature in the final stage of multi-effect evaporation, as well as the flow resistance of the condenser and related components. Therefore, the design and selection of the condenser are very important. You can consult organizations such as the Lanzhou Petroleum Machinery Research Institute and Lanzhou Hengda Petrochemical Machinery Company; they are leaders in China in terms of evaporation technology and engineering experience. A few suggestions, for reference only.