MULTI-STAGE DISTILLATION UNIT AND METHOD OF ITS OPERATION Russian patent published in 2019 - IPC B01D1/00 

FIELD: technological processes.

SUBSTANCE: invention relates to distillation units serving for preparation of water or for separation of alcohol from other liquids and used in many other plants, methods of distillation, as well as to control systems. Invention relates to multistage distillation plant with Si stages, where i = l,…n, wherein in operating mode each stage Si operates in higher pressure and temperature (Pi, Ti) than the next step Si + 1, wherein each stage Si comprises evaporator Ei and capacitor Ci, wherein each evaporator Ei and each capacitor Ci comprises a pressure-tight container with space above the liquid, wherein the space above the liquid of each evaporator Ei is pressure-connected with the space above the liquid of the capacitor Ci of the same Si step through the steam pipe with a large cross-section. Each outlet of each evaporator Ei is connected to the spraying inlet of the next evaporator Ei + 1, and outlet of last evaporator En is connected to spraying inlet of first evaporator El by corresponding liquid pipeline with integration into evaporation circuit, and each outlet of each capacitor Ci is connected to spraying inlet of previous capacitor Ci-1, and outlet of first capacitor CI is connected to spraying inlet of last capacitor Cn by liquid pipeline with integration into condensation circuit. According to invention, at least one steam line with its first end is connected to one of fluid pipelines between capacitors Ci + 1 and Ci or with liquid pipeline between evaporators En and E1, and by the second end is connected with space above liquid, which in operating mode has higher pressure P than pressure Pi in space above liquid of capacitor Ci, respectively, than pressure P1 in space above liquid of evaporator E1.

EFFECT: improvement leading to reduction of electric power consumption, creation of control system for operation of the plant.

20 cl, 3 dwg