Method and device for eliminating thermal inertia of hot air drier

Abstract

The invention discloses a method and a device for eliminating thermal inertia of a hot air drier. The method comprises the steps of arranging a proportional valve for adjusting smoke amount and hot air amount in a smoke channel connected with a heat exchanger, respectively measuring an inlet smoke temperature Ty1 and an outlet smoke temperature Ty2 of the heat exchanger, a hot air inlet temperature Tf1 of the drier and an external environment temperature Tf0 respectively by a temperature sensor, taking a smoke and hot air ratio as the matching principle of drying heat energy, and realizing the principle by controlling the opening degree of the proportional valve, so the temperature of the drying hot air is automatically matched and the thermal inertia of the hot air drier is eliminated. The device and method can be used in real time under complex ambient environment of drying equipment, the serious large hysteresis phenomenon in high inertia, multi-variable and nonlinear process operation in a hot air drying process is solved, the seed quality is guaranteed, the drying temperature is controlled, the thermal inertia in drying process is eliminated, and meanwhile, the method and device are beneficial for an efficient and energy-saving drying process.

Description

technical field [0001] The invention relates to the technical field of hot air dryers, in particular to a method and device for eliminating thermal inertia of hot air dryers. Background technique [0002] Drying temperature has a great influence on the quality and storage resistance of heat-sensitive materials and grains, especially high-humidity grains and seeds in high-temperature and high-humidity environments. Improper drying temperature parameters will significantly accelerate the rate of seed aging and deterioration. In order to obtain seeds with vigorous vitality after drying. There are drying upper limit temperature requirements for various hot air dryers, and the method of controlling the temperature is to adjust the fuel supply of the heating device to realize the adjustment method of the drying temperature. Because the heating system of the dryer is to burn the fuel in the hot blast stove first to form high-temperature flue gas, then introduce or blow the flue ga...

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Problems solved by technology

The large inertia of the hot air temperature change has a great impact on the drying quality and energy consumption of the material, making the sensitivity of the temperature control of the dryer and the effect of energy utilization very poor. How to eliminate the thermal inertia of the dryer and ensure that the drying temperature does not exceed Improving the accuracy and sensitivity of equipment regulation is a major problem that has not been solved in the field of hot air drying.

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