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In the early 1990s, the quick-frozen rice noodles in China started, which was much later than that in foreign countries. From 1992 to 1998, China's quick-frozen rice noodle industry was in the initial stage of development. At that time, there were a large number of quick-frozen rice noodle manufacturers, but the products were single, and the production process was backward. Generally, the ordinary mechanical cooling and freezing equipment, namely fluorine machine and ammonia machine, were used. Nevertheless, because the product price was relatively high at that time, the product had a large profit margin. In 1999, some large-scale enterprises began to expand production capacity and increase product lines, and began to invest in advanced quick-frozen equipment. At the same time, with the increasing purchasing power of quick-frozen rice and noodles in China, until 2005, some large-scale enterprises basically maintained a stable development.From 2005 to now, China's quick-frozen rice noodles have entered a stage of rapid development. According to China's industrial information data, the production capacity of quick-frozen rice noodles in China was about 1289700 tons in 2005 and 4105800 tons in 2012, with an average annual compound growth rate of 17.99% since 2005. According to the industry forecast, China's quick-frozen noodles and rice products industry will have an annual compound growth rate of 13% - 17% in the next five years, with a relatively rapid development momentum. With the continuous improvement of China's residents' income level and the accelerated pace of life, China's quick-frozen rice noodle industry is facing a huge development space. In recent years, Chinese residents' consumption of quick-frozen rice noodles has been on the rise. At the same time, they have begun to pay unprecedented attention to the quality of quick-frozen rice noodles. Many white-collar workers, single people and young couples have become loyal fans of quick-frozen rice noodles. However, these consumers attach great importance to the quality and nutritional value of food, The original flavor of frozen food and the non loss of nutrients will win them more. Of course, only to ensure the quality of food, enterprises can have greater development, can be recognized by the market. How to ensure the high quality of food, frozen link is crucial. It is understood that the liquid nitrogen quick freezing equipment produced by Beijing keweijiani fully meets the market demand, and the liquid nitrogen quick freezing equipment developed and produced by ourselves can not only guarantee the quality of food, but also be economical and environmentally friendly. So why can liquid nitrogen quick freezing equipment guarantee food quality?According to the marketing staff of keweijiani liquid nitrogen quick freezing equipment, the liquid nitrogen quick freezing equipment uses - 196 ℃ liquid nitrogen as the refrigerant, which can achieve 5-minute freezing. Because of the short freezing time, this kind of liquid nitrogen quick freezing equipment can take away the heat faster after contacting with food. This ultra-low temperature and high heat exchange rate realize the real rapid freezing, and the ice crystals produced by such rapid freezing are small, which can maintain the texture of food. This also prevents the loss of water, even without loss, and thus maintains the original color, taste and quality of the food. From international experience, the more developed the economy is, the faster the pace of life will be, the more detailed the social division of labor will be, and the more vigorous the demand for quick-frozen food in nutrition will be. According to the information, the quick-frozen food which is safe, healthy, nutritious, delicious and convenient is especially popular in the developed countries. China is a big producer of vegetables, fruits, rice noodles and aquatic products. Only by improving the quality of quick-frozen food can it enter the international market, and the advanced quick-frozen equipment is an important means to ensure its quality. The heating technology, temperature control technology and liquid nitrogen dispersion technology are used in the liquid nitrogen quick freezing equipment developed and produced by keweijiani, which makes the process of programmed heating, constant temperature and cooling uniform and stable- 196 ℃ liquid nitrogen refrigerant, meet the requirements of cooling and environmental protection.