China's drying operations involve a wide range of national economy, and it is also one of China's major energy-consuming households. The energy used accounts for about 12% of the total energy consumption of the national economy. The pollution caused by the drying process is often the main source of environmental pollution in China, so the energy saving and environmental protection issues of drying technology are very important. Drying with solar energy can effectively save energy and protect the environment. The drying temperature required for general agricultural products is relatively low, about 40-55 ° C, which matches the low-temperature heat utilization in the field of solar thermal utilization, which not only greatly shortens the drying cycle, but also significantly improves product quality without damaging. The nutritional value of its food. Therefore, the application of solar dry coal agricultural and sideline products has broad development prospects.
First, solar drying has the following characteristics compared with other dry products.
(1) Saving fuel:
(2) reduce pollution to the environment;
(3) shorten the drying cycle of the product;
(4) Improve the quality of the product;
(5) Improve the yield of quality products;
(6) The investment is small and the payback period is short.
Second, the classification of solar drying devices, solar drying devices are divided into four types according to the acceptance of solar energy and energy input: greenhouse type, collector type, collector - greenhouse type and monolithic type. In addition, according to the way of hot air flow, we can also divide the solar drying device into natural circulation and forced circulation.
1 Greenhouse type solar dryer The structure of the greenhouse type dryer is similar to the greenhouse for cultivating crops. The greenhouse is the drying room. The materials to be dried are placed in the greenhouse, directly absorbing solar radiation, the air in the greenhouse is heated and heated, and the material is dehydrated. To achieve the purpose of drying. Greenhouse dryers are generally equipped with an exhaust device to remove air with a large amount of moisture to shorten the drying cycle of the material. Because of its simple structure and low cost, this dryer is widely used in rural areas in Shanxi, Hebei, Beijing and Guangdong. Especially in Shanxi Province, more than 10 dryers of this type have been built, covering an area of ​​more than 1,000 m2, for drying red dates, daylilies, cotton and the like.
2 collector type solar dryer Collector type dryer is a drying device which combines a solar air collector and a drying chamber. The dryer uses a heat collector to heat the air to 60-70 ° C, and then enters In the drying chamber, the material realizes the convective heat and mass exchange process in the drying chamber to achieve the purpose of drying. The dryer is generally designed to be active and blasted with a fan to enhance convective heat transfer. This dryer has the following characteristics:
1 The temperature of the hot air can be adjusted according to the drying characteristics of the material; 2 the material is placed in the drying chamber in layers, and the material per unit area can be accommodated; 3 the convection heat transfer is enhanced, and the drying effect is better; 4 the material is suitable for drying without direct sunlight exposure. Such as antler, hops, sliced ​​jaundice, wood, rubber and so on.
3 collectors - greenhouse type dryers Greenhouse type solar dryers are simple in structure and high in efficiency. The disadvantage is that the temperature rise is small. When drying materials with high water content (such as vegetables, fruits, etc.), greenhouse type dryers The energy obtained is not sufficient to dry the material below a safe moisture content in a relatively short period of time. In order to increase the energy to ensure the dry quality of the dried material, a part of the collector is added outside the temperature chamber to form a heat collector - a greenhouse type solar drying device. On the one hand, the material directly absorbs the solar radiation passing through the glass cover layer, and on the other hand, it is washed by the hot air from the air collector, and the material is heated by radiation and convection heat transfer, which is suitable for drying those having high moisture content and required drying temperature. Higher material.
4 Integral Solar Dryer The integrated solar dryer combines both the solar air collector and the drying chamber into one unit. The trays containing the materials are arranged in the drying chamber, the materials directly absorb the solar radiant energy, function as the heat absorbing panels, and the air is heated due to the greenhouse effect. The axial flow fan is installed in the drying chamber to continuously circulate air in the two rows of drying chambers, and penetrate the material layer up and down to increase the surface of the material to contact with hot air. In an integrated solar dryer, the radiant heat transfer acts simultaneously with the convective heat transfer, and the drying process is enhanced. The humid air that absorbs the moisture is discharged from the exhaust pipe. By controlling the valve, part of the hot air can be recirculated with the fresh air replenished by the intake port, and the drying chamber can be re-entered to reduce the heat loss of the exhaust gas.
✓ COMPREHENSIVE. It has the perfect selection of emergency and survival supplies. You'll have peace of mind knowing that your kit is packed with everything you need in times of crisis.
✓ DURABLE BAG. This kit is designed to be tough, it is crafted with ripstop fabric and strong zipper, which provide that extra level of durability and protection.
✓ YOU CAN TAKE IT ANYWHERE. This kit is made to get you through a wilderness trip, a drive across the country, or just around your own home for daily misshapes.
First, solar drying has the following characteristics compared with other dry products.
(1) Saving fuel:
(2) reduce pollution to the environment;
(3) shorten the drying cycle of the product;
(4) Improve the quality of the product;
(5) Improve the yield of quality products;
(6) The investment is small and the payback period is short.
Second, the classification of solar drying devices, solar drying devices are divided into four types according to the acceptance of solar energy and energy input: greenhouse type, collector type, collector - greenhouse type and monolithic type. In addition, according to the way of hot air flow, we can also divide the solar drying device into natural circulation and forced circulation.
1 Greenhouse type solar dryer The structure of the greenhouse type dryer is similar to the greenhouse for cultivating crops. The greenhouse is the drying room. The materials to be dried are placed in the greenhouse, directly absorbing solar radiation, the air in the greenhouse is heated and heated, and the material is dehydrated. To achieve the purpose of drying. Greenhouse dryers are generally equipped with an exhaust device to remove air with a large amount of moisture to shorten the drying cycle of the material. Because of its simple structure and low cost, this dryer is widely used in rural areas in Shanxi, Hebei, Beijing and Guangdong. Especially in Shanxi Province, more than 10 dryers of this type have been built, covering an area of ​​more than 1,000 m2, for drying red dates, daylilies, cotton and the like.
2 collector type solar dryer Collector type dryer is a drying device which combines a solar air collector and a drying chamber. The dryer uses a heat collector to heat the air to 60-70 ° C, and then enters In the drying chamber, the material realizes the convective heat and mass exchange process in the drying chamber to achieve the purpose of drying. The dryer is generally designed to be active and blasted with a fan to enhance convective heat transfer. This dryer has the following characteristics:
1 The temperature of the hot air can be adjusted according to the drying characteristics of the material; 2 the material is placed in the drying chamber in layers, and the material per unit area can be accommodated; 3 the convection heat transfer is enhanced, and the drying effect is better; 4 the material is suitable for drying without direct sunlight exposure. Such as antler, hops, sliced ​​jaundice, wood, rubber and so on.
3 collectors - greenhouse type dryers Greenhouse type solar dryers are simple in structure and high in efficiency. The disadvantage is that the temperature rise is small. When drying materials with high water content (such as vegetables, fruits, etc.), greenhouse type dryers The energy obtained is not sufficient to dry the material below a safe moisture content in a relatively short period of time. In order to increase the energy to ensure the dry quality of the dried material, a part of the collector is added outside the temperature chamber to form a heat collector - a greenhouse type solar drying device. On the one hand, the material directly absorbs the solar radiation passing through the glass cover layer, and on the other hand, it is washed by the hot air from the air collector, and the material is heated by radiation and convection heat transfer, which is suitable for drying those having high moisture content and required drying temperature. Higher material.
4 Integral Solar Dryer The integrated solar dryer combines both the solar air collector and the drying chamber into one unit. The trays containing the materials are arranged in the drying chamber, the materials directly absorb the solar radiant energy, function as the heat absorbing panels, and the air is heated due to the greenhouse effect. The axial flow fan is installed in the drying chamber to continuously circulate air in the two rows of drying chambers, and penetrate the material layer up and down to increase the surface of the material to contact with hot air. In an integrated solar dryer, the radiant heat transfer acts simultaneously with the convective heat transfer, and the drying process is enhanced. The humid air that absorbs the moisture is discharged from the exhaust pipe. By controlling the valve, part of the hot air can be recirculated with the fresh air replenished by the intake port, and the drying chamber can be re-entered to reduce the heat loss of the exhaust gas.
Product Description:
✓ COMPREHENSIVE. It has the perfect selection of emergency and survival supplies. You'll have peace of mind knowing that your kit is packed with everything you need in times of crisis.
✓ DURABLE BAG. This kit is designed to be tough, it is crafted with ripstop fabric and strong zipper, which provide that extra level of durability and protection.
✓ YOU CAN TAKE IT ANYWHERE. This kit is made to get you through a wilderness trip, a drive across the country, or just around your own home for daily misshapes.
✓ COMPACT. The internal layout is organized whilst the pack is durable and fairly lightweight. Ideal for Car, Home, Office, Camping, Travel, Sports, and more. Includes a mini first aid kit.
Dongguan Maimeng Culture and Creative Co. Ltd , https://www.factorydirectmask.com