Device for multistage continuous preparation of deuterium depleted water

A device for multistage continuous preparation of deuterium depleted water, comprising a feeding pump, a plurality of stages of separation systems connected in series, and a receiver, wherein each stage of separation systems comprises a distillation column, a vapor-liquid separator, a low-pressure steam compressor, a stream delivery pump, a three-way valve, and a stream output pipe;

• wherein:
• the distillation column comprises a plurality of column sections arranged vertically from top to bottom, and a liquid phase vaporizer located at the bottom of the column;
• the distillation column is provided with a first liquid phase return inlet, a second liquid phase return inlet and a steam outlet at the top of the column, a liquid phase inlet at the middle of the column, and a waste liquid outlet at the bottom of the column;
• the liquid phase vaporizer is provided with a steam inlet in an upper part thereof and a stream outlet in a lower part thereof, the steam inlet and the stream outlet are connected through a hollow tube;
• the stream delivery pump has a stream inlet and a stream outlet;
• the three-way valve has three ports;
• the vapor-liquid separator is provided with a vapor phase inlet in the middle thereof, a vapor phase outlet in the top thereof, and a liquid phase outlet in the bottom thereof;
• the steam outlet of the distillation column is connected to the vapor phase inlet of the vapor-liquid separator, while the vapor phase outlet of the vapor-liquid separator is connected to an inlet of the low-pressure steam compressor and an outlet of the low-pressure steam compressor is connected to the steam inlet of the liquid phase vaporizer;
• the liquid phase outlet of the vapor-liquid separator is connected to the first liquid phase return inlet of the distillation column;
• the stream outlet of the liquid phase vaporizer of the distillation column is connected to the stream inlet of the stream delivery pump, and the three ports of the three-way valve are respectively connected to the stream outlet of the stream delivery pump, the second liquid phase return inlet of the distillation column and the stream output pipe;
• the feeding pump is connected ahead of the liquid phase inlet of the distillation column in a first-stage separation system;
• the stream output pipe of a last-stage separation system is connected to the receiver, and the stream output pipe of each of the other stages of separation systems is connected to the liquid phase inlet of the distillation column in a next-stage separation system;
• and all the connections are achieved by means of pipes.