TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The rotating shaft is provided with the same or different angular velocity. The water groove and the outlet water channel are fixed and connected with each other and provided with constant angular velocity. The static disc is circular plate-shaped structure. The outer edge width of the overflow weir is 5-100 mm, and the height is 0.1-2 m. The central column is installed on the upper part of the liquid distributing plate and is set between the outer diameter of the liquid blocking plate, where the inner diameter is 0.6-0.9 times and is mounted on the liquid blocking plate. The upper part of the liquid distributing plate is set between the inner diameter of the central column, where the outer diameter is 1.5-10 times, and the liquid distribution plate is between 2-50 nm. In the sea water coil pipe, the pipe diameter is 5-100 mm, and the sea water coil pipe is composed of 20 groups of circular disc pipes, each group of circular disc are distributed 20 layer in the vertical direction. The adjacent unit coil is connected with a sea water flow channel. In the steam coil pipe, the pipe diameter is 5-100 mm. The steam pipe coil is composed of 10 groups of circular disc pipes, each group of circular disc are distributed 10 layer in the vertical direction, and the adjacent unit coil pipe is connected with a steam flow channel. The seawater coil pipe and the steam pipe coil are made of a thermally conductive material. The drain valve is opened and closed according to the outlet water tank to control the liquid level; when liquid level is 5-20 mm higher than the water leakage hole, the drain valve is opened; when liquid level is 1-10 mm higher than the liquid level of the drain valve, then the drain valve is closed. The fresh water outlet and the concentrated sea water outlet is connected with the sea water pre-heating chamber. The vacuum evaporating chamber is tangentially connected, and the outlet is set in the same direction and corresponds to the rotating shaft direction. The friction heater is filled with silicone oil or other heat sensitive fluid medium.