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The boiler is composed of water wall tubes arranged around the boiler furnace, upper and lower boiler tubes arranged horizontally and convection tube bundle connecting devices, which play the role of heat exchanger. The high-temperature flame and flue gas generated by combustion will heat the water in the boiler through the heating surface of the boiler, and then gasify to generate steam with a certain pressure and temperature. A boiler is actually a steam generator in a boiler. It is a part of the boiler body. The boiler body includes boiler, furnace, steam filter, economizer and air preheater.
Steamed chicken first spread in southern Yunnan. According to legend, it was invented by Yang Li, the chef of Lin 'an Prefecture (now Jianshui County), and became a famous dish in central Yunnan. 1947 was introduced to Kunming. At that time, the first steamed chicken restaurant opened in Fuzhao Street, all of which cooked this dish.