Potassium chloride triple-effect evaporation system capable of improving heat energy utilization rate

Abstract

The invention discloses a potassium chloride triple-effect evaporation system capable of improving the heat energy utilization rate. The triple-effect evaporation system comprises a one-effect evaporator, a double-effect evaporator, a triple-effect evaporator, material rotating pumps, a mixing condenser and a liquid seal tank which are successively connected. A heat exchanger used to recover steam heat of the triple-effect evaporator is disposed between the steam outlet of the triple-effect evaporator and the steam inlet of the mixing condenser. The material liquid is communicated with the steam inlet of the triple-effect evaporator through tube passes of the heat exchanger. The steam outlet of the triple-effect evaporator is connected with the steam inlet of the mixing condenser through shell passes of the heat exchanger. The triple-effect evaporation system is advantaged by assuring heat recovery and reutilization of triple-effect steam, achieving an objective of energy conservation and emission reduction, protecting equipment from being corroded by acid steam, reducing damage of the steam to equipment and prolonging service lifetime of the equipment.

Description

technical field [0001] The invention relates to a multi-effect evaporation system for salt production, in particular to a potassium chloride triple-effect evaporation system for improving heat energy utilization. Background technique [0002] The three-effect evaporation system in the prior art is an extraction and concentration equipment, which adopts the working principle of tube-and-tube circulation and external heating. The physical heating time is short, the evaporation speed is fast, and the concentration ratio is large. The original effect of the material is effectively maintained, and the energy saving effect is remarkable. It is widely suitable for pharmaceuticals Evaporation and concentration process of liquid materials such as chemical, food, light industry, etc., including a single-effect evaporator for evaporating the liquid and having a feed inlet, a feed outlet, a steam inlet, a steam outlet and a condensed water outlet. ', two-effect evaporator 2', and three-...

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Problems solved by technology

The steam entering the three-effect evaporator is used to exchange heat with the feed liquid to increase the temperature of the feed liquid entering the tank. The temperature of the steam evaporated by the three-effect evaporator is about 60°C, and the enthalpy value is 620Kcal / kg, which has a high However, the steam is discharged into the mixed condenser and then discharged out of the system after being condensed. The heat energy of the steam is not utilized and is lost in vain, failing to achieve the purpose of energy saving and emission reduction.

If the steam evaporated from the three-effect evaporator is not excluded from the system, it will cause positive pressure in the evaporator, affect the heat exchange of the evaporator, and make the evaporator unable to produce, thus providing a three-effect potassium chloride that improves the utilization rate of heat energy. Evaporation system has become a concern of the industry

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