Process gas temperature control method for superheated steam drier

Abstract

The invention discloses a process gas temperature control method for a superheated steam drier. The process gas temperature control method comprises the following steps: setting standard values of incoming tobacco water, process gas temperature and combustion furnace temperature as d<standard>, c<standard1> and c<standard2> respectively, and detecting real-time values of the incoming tobacco water, process gas temperature and combustion furnace temperature as d<real>, c<real 1> and c<real 2> respectively; respectively performing real-time comparison on the c<real 1> and c<standard1>, d<real> and d<standard> and c<real 2> and c<standard2>, and outputting the bypass air damper opening degree y1, ywater and ytemperature by virtue of a temperature PID (Proportion Integration Differentiation) controller, a water compensation module and a temperature compensation module in real time; and calculating a bypass air damper opening set value y according to a formula of y=y1+ywater+ytemperature, outputting the set value to a bypass air damper locator to be used for controlling the real-time opening of the bypass air damper. According to the method, the incoming tobacco water and the combustionfurnace temperature can be pre-judged, the set value of the bypass air damper opening can be corrected in advance, and the process gas temperature is rapidly and accurately adjusted.

Description

technical field [0001] The invention belongs to the field of tobacco processing, and in particular relates to a method for controlling the production process of tobacco shreds, in particular to a method for controlling the temperature of the process gas of an airflow type shred dryer. Background technique [0002] In the tobacco shred process, the air-flow shred dryer uses high-temperature drying gas to quickly dry, expand and shape the shredded tobacco. The high-temperature drying gas is the process gas in the shredded shredded process. and other sensory qualities. Before and after the heat exchange between the process gas of the air flow drying machine and the wet shredded tobacco, the temperature difference reaches more than 100°C, and part of the process gas is sent back to the heat exchanger in the combustion chamber through the fan and bypass damper for reheating and recycling, and the rest of the gas is recycled. emission. During the process of heat exchange and reh...

AI Technical Summary

Problems solved by technology

None of the above control methods solves the influence of the moisture content of the incoming cut tobacco and the temperature of the combustion furnace on the temperature fluctuation of the process gas, and cannot correct the setting value of the opening of the bypass damper in advance, and there is still a problem of lag in temperature adjustment

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