Energy-saving method and device for controlling moisture discharging of roller-type cut-tobacco dryer

Abstract

The invention discloses an energy-saving method and a device for controlling moisture discharging of a roller-type cut-tobacco dryer. A pressure sensor is arranged in a rear chamber of the cut-tobacco dryer, measuring-point air pressure of the pressure sensor is controlled by controlling opening degree of an adjusting air door between a bag-type dust collector and a moisture-discharging fan, and cold air flow entering the cut-tobacco dryer is controlled by controlling the measuring-point air pressure. The mode of controlling the measuring-point air pressure is adopted, so that moisture-discharging air quantity can automatically follow evaporation load quantity of the cut-tobacco dryer, motor power of the moisture-discharging fan is in a power-changing state, and energy consumption is reduced. By the method, actual power of the moisture-discharging fan is substantially lowered than that in original modes, so that energy saving is facilitated. Moisture discharging quantity is more stable than that in the original modes, so that moisture control of the cut-tobacco dryer is facilitated. Consumed steam quantity in spare time of 1 / 4 of each day is substantially reduced.

Description

technical field [0001] The invention relates to an energy-saving moisture discharge control method of a drum type silk dryer and a device for realizing the method. Background technique [0002] Tobacco drying is an indispensable part of tobacco processing. Drum shredded shredded drying machine has the characteristics of good quality and uniform moisture in dried shredded tobacco. It can improve the aroma and remove bad smell for high-grade shredded tobacco drying, and is widely used. [0003] Drum type silk dryers generally use the cylinder wall as the main drying method. High-temperature steam is passed through the cylinder wall, and the high heat enthalpy of the steam is used to heat the shredded tobacco through the conduction of the cylinder wall. Bad smelling moisture. [0004] Since the moisture contained in shredded tobacco is heated and evaporated during the drying process, a large amount of moisture will be generated, which needs to be discharged through a moisture ...

AI Technical Summary

Problems solved by technology

[0004] Since the moisture contained in shredded tobacco is heated and evaporated during the drying process, a large amount of moisture will be generated, which needs to be discharged through a moisture discharge device. Early drum-type shredded drying machines generally adopt a fixed moisture discharge method to discharge the airflow containing smoke and moisture to the corresponding For bag-type dust collectors, since the evaporation load in the production process is always fluctuating, it is difficult to determine the moisture discharge volume. If the moisture discharge volume is too small, it will be difficult to discharge the moisture generated in the drying cylinder, which will further affect the moisture control of dried products. Excessive moisture discharge volume will discharge more high-temperature airflow, and the moisture discharge fan works at a high power state, which consumes a lot of energy

[0005] Recently, pressure control is commonly used in drum-type silk dryers. By installing a pressure sensor somewhere in the drum-type silk dryer, the bypass vent door of the moisture exhaust pipe is controlled, and the amount of cold air drawn from the room is adjusted through the bypass vent door. The air pressure at the measuring point of the pressure sensor, because the air pressure at the measuring point is disturbed, the signal is relatively complex, and this PID control also has major disadvantages. As a result, the pressure at the measuring point fluctuates greatly, and the control quality is poor. , the moisture exhaust fan after the bag filter is also working in a high power state, which consumes a lot of energy

[0006] In addition, at present, cigarette shred processing adopts many process modes of group processing. Generally, there are multiple drum dryers in parallel on the production line. During the process of formula connection, some shred dryers are always in the waiting mode. The power of the fan depends on the pressure loss of the system and the flow rate of the gas. Since the pressure loss is basically unchanged, and the tidal discharge volume is particularly large, the power consumption of the tidal discharge fan is relatively large, which is not conducive to energy saving.

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