Detection device for isothermal adsorption and desorption of biomass moisture in sheet tobacco or shredded tobacco

Abstract

A detection device for isothermal adsorption and desorption of biomass moisture in sheet tobacco or shredded tobacco, which consists of a gas mixing unit, an adsorption and desorption unit, a weighing unit, a data acquisition and control unit, and the gas mixing unit and the adsorption and desorption unit are respectively Independent setting; the device can detect the isothermal adsorption and desorption process of moisture in sheet tobacco or shredded tobacco under certain temperature and humidity conditions. By analyzing the change of moisture in the sample with time, the rate of moisture adsorption and desorption in different samples and the results of the moisture content in the equilibrium state are obtained, so as to characterize the moisture adsorption and desorption performance in biomass materials such as tobacco or shredded tobacco. The advantages of the present invention are: the working temperature and humidity range is wide: the adjustment range of temperature and humidity: the temperature is 5°C to 90°C, the relative humidity is 5% to 95%, and the stability of the load cell under high temperature test conditions can be guaranteed , to realize the adsorption and desorption test of biomass materials under high temperature environment.

Description

Technical field [0001] The invention relates to a device for isothermal adsorption and desorption of biomass moisture, in particular to a device used in the field of tobacco processing to detect moisture isotherm adsorption and desorption processes in sheet tobacco or cut tobacco (biomass). Background technique [0002] Sheet tobacco or cut tobacco is a porous medium composed of complex organic substances. During the heat and moisture treatment of tobacco processing, some changes may be caused to the pore structure of tobacco leaves or cut tobacco. At the same time, the addition of some external liquids during processing changes the surface of tobacco leaves or cut tobacco. The physical and chemical properties result in a certain change in the ability of the moisture in the processed tobacco or cut tobacco sample to absorb moisture and remove moisture under certain temperature and humidity conditions. When evaluating the isotherm adsorption and desorption capacity and change law ...

AI Technical Summary

Problems solved by technology

However, this device has the following shortcomings in the test application: 1) Since the balance is in the incubator, the temperature of the incubator should be set at 5°C-50°C (this temperature range is the normal condition of the balance, and the balance is close to or exceeds 50°C). ℃, it is easy to cause temperature drift or damage), and it is difficult to realize the adsorption and desorption experiment above 50 ℃ (most of the tobacco drying and moisture regain performance tests need to be operated and tested in the range of 50 ℃ ~ 90 ℃ , higher than 50°C has application value); 2) Since the saturated humid air is directly generated by the water bath, the temperature of the saturated humid air is slightly lower than the temperature in the adsorption and desorption chamber, and the relative humidity is difficult to reach 90% RH under the condition of higher than room temperature, It makes it difficult to quickly adjust the high humidity test; 3) The temperature of the saturated humid air is very easy to condense under high humidity conditions due to the above reasons in 2), which affects the test effect and test accuracy, and at the same time, damages the balance

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