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Structural characteristics of shell boilers
The basic structure of a shell boiler is a double-layer jacket structure. The outer cylinder is called the pot shell, the inner cylinder is called the furnace liner, and the circular space between the inner and outer cylinders is filled with water, while the inner cylinder is the combustion chamber. When the water vapor medium is under pressure, the pot shell is subjected to internal pressure, and the furnace liner is subjected to external pressure. There are two types of shell boilers: separate and horizontal. The commonly used oil and gas boilers at present are WNS type horizontal internal combustion shell boilers.
Shell boilers have the following common characteristics:
The “pot” for holding water and the “furnace” for burning fire are both contained in one shell – the pot shell;
2. The metal furnace has a small volume, is surrounded by water, has a high degree of water cooling, poor combustion conditions, and must burn high-quality fuel; 3. There are few heating surfaces and low evaporation or thermal power. Water pipes or smoke pipes are often installed to increase the heating surface and boiler capacity; 4. The diameter of the pot shell is relatively large, with many openings and irregular shapes. The heated and non heated parts inside are connected together, and the temperature and degree of thermal expansion are different, resulting in poor safety of the shell; 5. The boiler structure system is relatively simple, making it easy to transport, install, operate, manage, and inspect and maintain.