What structure and function of the drum and the header each has a double drum and a single drum. The double-drum boiler has two upper and lower drums. The upper drum is also called a steam drum. The inside is filled with a steam-water mixture. The lower drum is also called a water bag, and all the water is contained inside. The upper and lower drums are cylindrical containers welded by a steel head and a barrel body, and a hole is formed in the head. The upper drum is equipped with a water distribution device, a steam-water separation device, a sewage device, etc., and is externally connected to the heating surface tube and is equipped with a safety attachment. The lower drum is provided with a sewage device. The function of the upper drum is to accommodate a certain amount of water, to maintain a certain water level of the boiler, to improve the stability of the boiler pressure and the steam temperature; to form a circulation loop with the tube of the evaporation heating surface; the steam-water mixture is separated in the upper drum. The function of the lower drum is to form a circulation loop together with the upper drum and the convection tube bundle, depositing water slag and discharging it regularly. The header box is also called a header box. It is made of a large diameter seamless steel tube and two end caps. The box body has many tube holes for welding the tubes. The function of the header is to collect or distribute the steam and water working substances in the plurality of pipes; to reduce the conveying connection pipe of the working medium; and to reduce the number of openings of the drum. According to the use of the header, there are economizer headers, water-cooled wall headers, superheater headers, and the like. For details, please visit: http:// http://news.chinawj.com.cn Edit: (Hardware Business Network Information Center) http://news.chinawj.com.cn 3M Measuring Tape,Waterproof Tape Measure,Stainless Steel Tape Measure,Plastic Tape Measure SHANGQIU CHAOYUE MEASURING TOOLS CO., LTD , https://www.equipmentool.com