In today's economic situation, our country's industrial economy has developed to a period of coordinated development. For this period, we should not only pay attention to the actual economic benefits, but also reasonably allocate different resources to obtain better environmental protection effects.
The investigation shows that the air consumption per ton of tissue paper is more than 3.5t in the production process of most of China's tissue paper factories. Compared with the same drying form abroad, the energy consumption is more than 30% - 50%. On one hand, it shows that the drying capacity of tissue paper machines in China has great potential. On the other hand, it also shows that there is a serious energy waste problem when the performance of tissue paper machines is not fully developed. How to achieve higher capacity with lower energy consumption, or improve the control efficiency of energy conservation and emission reduction, and promote industrial innovation and development, is the core issue faced by relevant sections.
With the continuous deepening of the concept of sustainable development, the rational use of energy and energy conservation has become a core influencing factor in the development of the paper industry. From the current point of view, if the tissue paper machine wants to flexibly use the drying optimization and energy-saving technology, the Yankee hood is the key, which can protect and optimize the drying environment, and ensure the product quality by adjusting the air balance low drying cost. The Yankee hood itself is a drying device which combines the paper sheet contact drying and convection drying, and its performance is about 4-10 times higher than that of ordinary drying.
Using the basic principles of contact drying and convective drying, high temperature and high speed hot air can make the hot air produce strong convection heat transfer to the paper, blow the hot air vertically to the paper surface, reduce the thickness of the interface air film, and even directly destroy the air film, improve the heat and mass transfer coefficient. In this way, the evaporation can be enhanced, the paper machine output and the drying efficiency of the dryer can be improved. Paper production plays an irreplaceable role, not only can effectively save energy consumption, but also can improve the softness and bulk thickness of tissue products.
Standard Yankee hood has been popularized and popularized. It belongs to a kind of hot air hood of drying cylinder. With impact drying, the air flow temperature can reach about 200 ℃ and the air flow rate is 50-160m / s. According to the actual demand, the mechanical structure from the transverse nozzle box to the pressure ventilation system can be reasonably designed.
The hot air hood can complete the drying work under high impact temperature, which can divide the drying into three independent areas, namely high temperature toe shaped area, mixing area and drying area. The temperature of the three areas can be adjusted according to the demand of quality and output. However, in practical application, considering the specific situation of toilet paper factory, the standard Yankee hood is usually improved and optimized to further enhance the energy saving effect
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