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As can be seen from the diagram, the steam drum mainly consists of three parts: (1) the steam-water separation device. (2) Steam cleaning device. (3) Devices for sewage discharge, chemical dosing, emergency water release, etc. Principle of the steam-water separation device: (1) Utilizing the density difference between steam and water for gravitational separation ； (2) Utilize the inertial force generated when the steam flow changes direction for inertial separation ； (3) Utilizing the centrifugal force generated by the rotational motion of the steam flow for the centrifugal separation of steam and water, as well as adsorption separation achieved by causing water to adhere to the metal wall surface to form a water film that flows downward. It mainly includes devices such as cyclone separators and louver separators. A cyclone separator is a cylinder made of steel plates with a thickness of 2–3 mm; the steam-water mixture enters the cyclone at an angle from the inlet volute. Due to centrifugal force, water droplets are thrown against the cylinder walls, thereby separating steam from water. Afterwards, under the effect of gravity, the steam rises from the top through the wave-shaped plate cover into the steam space of the drum, while the water enters the water space from the bottom, completing one cycle of separation ； Further separation is achieved through the secondary separation by the louver separator, thereby achieving the purpose of separating steam from water. The center line of the inlet pipe of the cyclone tube is positioned above the highest water level in the drum; this ensures that the water level inside the tube remains below the edge of the separator’s inlet pipe. The bottom of the separator’s tube should be 200 mm below the normal water level, to prevent steam from escaping through the bottom of the tube. To prevent steam from being carried out with the drainage at the bottom of the drum and entering the downcomer, trays are installed at the bottom of the drum. A perforated plate is installed before the steam extraction pipe at the top of the drum; this is done to utilize throttling effects in order to distribute the saturated steam in the steam space evenly along the length and width of the drum, thereby improving separation efficiency. The perforated plate is made of steel plate 3-4 mm thick, with a pore size of 10 mm. The cyclone separator is as follows: