Li Shujun said that during the "11th Five-Year Plan" period, the average annual growth rate of China's food and packaging machinery industry's total output value was close to 22%. In 2010, the total output value exceeded 180 billion yuan, a year-on-year increase of 23%; it is expected that by the end of the "Twelfth Five-Year Plan", it will reach 600 billion yuan. It has become one of the most dynamic and fastest growing industries in the national economy.
It is understood that for a long time, China's food packaging machinery industry has a low level of product technology, irrational industrial institutions, low standardization, and lack of innovative capabilities. It is severe, homogenous, low-level vicious competition, and a serious shortage of market supply capacity. , Intelligent high-end food and packaging machinery mainly rely on imports. At present, a new round of technological revolution led by information technology and materials technology will further widen the gap with the international advanced level and even endanger the national food safety.
Jiang Qi, General Manager of Hualian Machinery Group Co., Ltd., also told NetEase that China's food industry is currently focusing only on production and sales in the direction of "production," "sales," and "development". The gap between food industry companies is gradually narrowing, but he believes that "in the short term, China's food industry will still win with prices rather than advanced technology."
Studded tube and studded fin tube are used to enhance convection heat transfer outside the tube. In order to avoid excessive ash accumulation and affect the heat transfer effect, in addition to the mandatory burning oil and oil and gas mixed burning should be set up soot blower, but also according to the scope of use should be correctly selected nail head tube or fin tube. It not only receives the radiation heat transfer from the radiation chamber, but also absorbs the convection heat transfer from the high temperature flue gas. The surface heat intensity of the furnace tube is very high, sometimes even exceeds the heat intensity of the radiation tube. These two or three rows of furnace tubes are called shielding tubes, which can only be used as light tubes, and can not be used as nail head tubes and fin tubes. The heat transfer coefficient of the medium in the convection chamber of tubular furnace is generally much greater than that of the flue gas outside the tube.
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