Method for applying frequency modulation technology to tobacco leaf curing equipment

Abstract

The invention discloses a method for applying the frequency modulation technology to tobacco leaf curing equipment. The method is characterized in that in each stage of the tobacco leaf curing process, the speed of a fan is changed through frequency modulation setting; the functions of a frequency conversion regulator are integrated into a control instrument, and the control instrument is used for intelligently controlling the stepless circulating frequency conversion fan, a sensor, a humidity removal device and a combustion supporting device, wherein according to the specific frequency modulation setting, in the two hours after ignition, the frequency is 50 Hz; after two hours, the frequency is 35 Hz at the temperature of 42 DEG C, the frequency is 50 Hz at the temperature of 43 DEG C to 48 DEG C, the frequency is 35 Hz at the temperature of 49 DEG C to 53 DEG C and the frequency is 25 Hz at the temperature of 54 DEG C to 68 DEG C. The method has the advantages that the tobacco leaf curing quality is improved, the sweet flavor of tobacco leaf concoctions is enhanced obviously, the energy saving effect is obvious, the consumption reduction effect is obvious, equipment damage is reduced, the effective service life of the equipment is prolonged, and the maintenance cost is greatly reduced. The method is suitable for tobacco operating management enterprises, flue-cured tobacco planting enterprises, specialized households and individual tobacco growers.

Description

technical field [0001] The invention relates to tobacco leaf curing of flue-cured tobacco, and also relates to frequency conversion technology, in particular, to a method for applying frequency conversion technology in tobacco leaf curing equipment. Background technique [0002] At present, the construction of domestic dense barns is carried out according to the requirements of the State Tobacco Office [2009] No. 418 document. The circulating fan is a 4 / 6-pole motor and a No. 7 axial flow fan. Under the power supply of 50 Hz power grid, the speed at high speed is 1450 r / min, the power is 2.2 kW for three-phase, 1.5 kW for single-phase, 1.5 kW and 0.9 kW respectively at low speed, and the fluctuation is allowed to be ±20%. The 4 / 6-pole motor is an asynchronous motor that is started directly, and the current is very large when starting, which is 6 to 8 times the rated current, and the starting current will also cause effects: First, the power supply voltage drops when starting...

AI Technical Summary

Problems solved by technology

The 4 / 6-pole motor is an asynchronous motor that is started directly, and the current is very large when starting, which is 6 to 8 times the rated current, and the starting current will also cause effects: First, the power supply voltage drops when starting, especially the transformer power supply. The smaller the capacity, the greater the voltage drop; the second is that the starting current will cause loss in the circuit and inside the motor, causing the motor to heat up, and the motor of the relay, contactor, and circulating fan is easily damaged

Third, the relative energy consumption in baking is relatively high

Fourth, under the action of strong wind, not only will there be a large amount of energy loss, but also some aroma substances will be damaged under the action of strong wind, which is not as good as the tobacco leaves roasted in small modified densification barns.

This device has a certain effect on the wind speed of the oven, but it has no obvious effect on the entire baking process.

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