March 29, 2024

The concept of energy saving continues to heat up how can the hot air circulation oven be upgraded?

Hot air circulation oven is suitable for heating, solidification, drying and dehydration of materials in pharmaceutical, chemical, food, agricultural and sideline products, aquatic products, light industry, etc., such as raw materials, Chinese medicine decoction pieces, extracts, powders, granules, dehydrated vegetables, etc. In recent years, with the improvement of the industry's awareness of energy conservation and environmental protection, and the increasing demand for energy conservation by users, how to make the hot air circulation oven more energy-efficient has become a difficult problem for enterprises to upgrade.

It is believed in the industry that the energy saving of the hot air circulation oven can be improved from these angles: increasing the inlet air temperature of the hot air circulation oven and lowering the exhaust gas temperature of the drying equipment. Increasing the inlet air temperature of the drying equipment is beneficial to improve the thermal efficiency of the oven. However, the inlet air temperature is limited by the product's allowable temperature. In a co-current oven, the surface temperature of the particles is relatively low. Therefore, the drying device inlet air temperature can be much higher than the product allowable temperature.

Do a good job of insulation of the drying system to reduce various heat losses in the drying process. It is understood that the heat loss of the hot air circulation oven generally does not exceed 10%, and the heat loss is about 5% if the medium and large production equipment is suitable for heat preservation. Therefore, it is important to do a good job of the insulation of the drying system, but it is not the thicker the insulation layer, but the thickness of the insulation layer should be determined.

According to the industry, in order to prevent the leakage of the drying system, the blower and the induced draft fan are generally used in series, and the system is operated under zero pressure condition after reasonable adjustment, so that the leakage of the drying medium or the leakage of the ambient air can be avoided in the hot air circulation oven. Causes a decrease in the thermal efficiency of the oven.

Before the material enters the hot air circulation oven, the pre-dewatering treatment such as filtration, centrifugal separation or evaporation of the evaporator can increase the solid content in the material, thereby reducing the evaporation load of the oven, and is also an effective method for energy saving of the drying equipment.

In addition, there are hot air circulating oven manufacturers to study the principle and drying mechanism of the hot air circulation oven, so that the improved oven can better meet the requirements of GMP regulations, and the use efficiency and product quality of dry materials are greatly improved.

Some manufacturers said, "by improving the oven structure, rationally distributing the flow direction and circulation of hot air, increasing the hot air circulation filtration in the oven, etc., reducing the temperature difference inside the cabinet, further reducing energy consumption and optimizing the purification environment inside the cabinet." At present, this improved hot air circulation oven is widely used in the pharmaceutical, chemical, food and other industries, as well as drying and dehumidification of materials and finished products in laboratories and small-scale production.

Other manufacturers have upgraded the equipment several times, the hot air circulation oven has reached the foreign level, the average thermal efficiency is about 30%, the manufacturer said, "the original is the use of centrifugal fan, box extracorporeal circulation, manual control The method of warming. After many transformations, the hot air circulation oven adopts axial flow fan, equipped with automatic constant temperature control system, and is equipped with computer control system for selection, which greatly improves the automation degree, helps the enterprise to reduce energy consumption, and improves The quality of the dry material product."

In general, with the concept of energy conservation and environmental protection and the continuous promotion of relevant policies, hot air circulation oven equipment is also in urgent need of transformation and upgrading, and energy conservation will become one of the main upgrade directions. In addition, no cross-contamination and high efficiency have become important targets for industry transformation.

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