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Hubei professional production of combined multi-effect evaporator process

Release time: 2020-02-08 05:07:53

Physical properties of sodium nitrate: molecular formula NaNO3. Molecular weight 84.99, melting point 306.8 * C, relative density (water = 1): 2.261 begins to decompose at 380C, nitrogen and oxygen are released at 400 ~ 600 * C, and one- Nitrogen oxide, a small amount of nitrogen dioxide and nitrous oxide will not be produced until 775 865C.

The crystallizing tank is made of imported 316L or 304 stainless steel, the inner wall is electrolytically polished or mechanically polished, the outer wall is insulated with a 304 all-welded structure, and the outer surface is treated with mirror or matt.

The selection of the correct material of the MVR evaporator is very important, which is directly related to the service life of the evaporation concentration, crystallization and drying equipment. Wastewater has acid and alkali, chloride ion, ammonium sulfate ion, salts with different concentrations, materials containing organic matter, and the degree of corrosion is also different. Therefore, the corresponding materials must be selected to ensure the normal and stable operation of the equipment, and the temperature is different. Material model specifications also vary.

Segmented evaporation can be adopted according to the concentration of the required product, that is, when the product cannot reach the required concentration after passing the effect for the first time, after the product leaves the effect, the product is passed through the external tube of the effect by a vacuum pump under the effect. Draw the upper part of the effector and pass the effector again, and then pass the effector repeatedly to reach the desired concentration. Compared with the traditional multi-effect evaporator, it is an efficient and energy-saving device.

Multi-effect evaporator is divided into ordinary multi-effect evaporation system, forced circulation multi-effect evaporator and multi-effect falling film evaporator. The forced circulation multi-effect evaporator can be used in situations where there is crystallization during the evaporation process and it is a non-heat sensitive material. Multi-effect falling film evaporator is suitable for materials with high heat transfer coefficient and heat sensitive materials.

The main features of the multi-effect continuous evaporation crystallizer: 1. The whole system has a reasonable and beautiful design, stable operation, high efficiency and energy saving, and low steam consumption; 2. A large concentration ratio and falling film evaporation make the liquid with a higher viscosity easily flow and evaporate Concentration time is short; 3. Special design can be switched and modified through simple operation to adapt to the production of different products; 4. Low evaporation temperature, part of the secondary steam is re-inhaled into the shell of the first-effect evaporator by the spray heat pump, heat It is fully utilized, and the material liquid is mildly heated, which is suitable for the concentration of heat-sensitive materials; 5. The top of the evaporator is sprayed or fed through multiple overflow film distribution devices to ensure that the material liquid is evenly distributed in the evaporator film tube, forming a film, Increasing the heat transfer coefficient and increasing the evaporation rate can prevent the "dry wall" phenomenon; 6. After the liquid-liquid is vapor-liquid separated at the bottom of the evaporator, it enters the separator and then separates, which strengthens the separation effect and makes the overall equipment have a larger operation Elasticity; 7. Large-scale equipment adopts a vertical floor-standing structure, the entire equipment has a compact structure, a small footprint, and a simple and smooth layout, which represents the development of large-scale complete evaporation equipment; 8. Continuous feeding and discharging, the material liquid can reach the required concentration in one pass in the equipment; 9. The two processes of sterilization and concentration are completed at one time, and the material is heated for a short time, which is suitable for the concentration of heat-sensitive material liquid; The pipeline can be cleaned in situ, the entire equipment is easy to operate, and there is no dead angle; 11. The condenser with a special structure can operate normally at a cooling water temperature of 30 ° C or higher; 12. The power control is all controlled by the control cabinet To achieve and can install the automatic control system according to user requirements; 13. The use of a specially developed concentrated pump, reliable sealing, stable performance, minimal maintenance, stable operation; 14. The equipment can run continuously.