Hot air cycling drying equipment and method of using same for dewatering and drying agricultural and sideline products

Abstract

The invention provides hot air cycling drying equipment which comprises an integral equipment housing and a plurality of air vents at the top of the integral equipment housing. Three or four layers of loading overturn plate devices arranged from top to bottom in the inner upper portion of the integral equipment housing, air chambers including an air distribution chamber and a cycling air guide chamber are arranged below the loading overturn plate devices and communicated with a fan outside the integral equipment housing through an air port, the air distribution chamber is 1.5-1.7m in height, and the cycling air guide chamber is 0.45-0.60m in height. By means of minimum effective vent area guarantee, relative humidity control and effective air distribution of multi-layer materials, fan and heat effective utilization rate can be increased. The invention further provides three drying processes, original colors and proper odors of agricultural and sideline products can be kept to the greatest extent, competitiveness of the dewatered agricultural and sideline products processed by hot air drying to the dewatered agricultural and sideline products processed by other drying methods is effectively improved, and energy consumption of the hot air cycling drying equipment is only tenth of that of current domestic mainstream monolayer hot air drying equipment.

Description

technical field [0001] The invention relates to drying equipment and a drying method for agricultural and sideline products, in particular to a hot air cyclone drying equipment and a method for dehydrating and drying agricultural and sideline products. Background technique [0002] The dry storage of agricultural products has a long history in our country. The traditional drying is drying or air-drying. The large-scale industrial production of dehydrated agricultural and sideline products started in the 1970s. Today, China’s export share of dehydrated vegetables accounts for more than half of the world’s total. . [0003] At present, agricultural and sideline products are mainly divided into drying dehydration and freezing dehydration according to their different dehydration methods. According to different dehydration mechanisms, a large number of new processes and new equipment have been derived. In terms of dehydration efficiency and product cost control, drying dehydratio...

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Problems solved by technology

Domestic technology is concentrated on small and medium-sized equipment. According to production capacity, it is generally divided into box dryers, belt dryers, and tunnel dryers. This type of drying equipment more or less requires human intervention to assist material turning to solve such as material color, etc. problem, unable to achieve large-scale production

In the patent specifications of CN201220082399.9 and CN200910034238.5, some continuous dryers that can be applied to the production of dehydrated vegetables on a medium scale or above are recorded, which basically belong to the deformation of belt dryers and tunnel dryers. , can only effectively dehydrate and dry single-layer materials, and there are problems such as high energy consumption, small processing capacity, poor product color and quality; internationally, drying equipment in Yugoslavia and Belgium can use hot air to dehydrate multi-layer materials. It can be used for dehydration and drying of agricultural and sideline products such as hops. However, this type of equipment has extremely strict requirements on the height of equipment and workshops. The height of the whole machine can even reach 14 meters. To achieve effective air-controlled drying, the agricultural products are turned from the upper layer to the lower layer through the flap structure, and the drying is completed after passing through six to eight layers of flaps. In the specific use process, it is found that this type of equipment can only process agricultural and sideline products with low water content. Unable to handle agricultural by-products with high water content

[0005] After the material transfer process exceeds one layer of structure, there will be uneven drying of the upper layer, and the uneven drying speed of the material will lead to the problem of low product quality. It is the hot air drying speed that easily leads to low product quality that develops microwave or freezing. Drying and other production methods that are controllable to product quality but have high additional costs are also the root cause of domestic research and development of single-layer drying equipment and the need for high space for air distribution in the world

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