Method for quickly and simultaneously measuring moisture diffusion and moisture permeability of biomass material

A biomass material and diffusivity technology, which is used in the analysis of suspensions and porous materials, analysis of materials, and absorption and weighing of materials, etc., can solve the problems of single measurement of moisture permeability or moisture diffusivity, and uncontrollable measurement of ambient temperature, etc. Achieve fast test methods, constant airflow conditions, and short time-consuming effects

Inactive Publication Date: 2018-11-30
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing technology, some cannot control the temperature of the measurement environment, and some can only me

Method used

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  • Method for quickly and simultaneously measuring moisture diffusion and moisture permeability of biomass material
  • Method for quickly and simultaneously measuring moisture diffusion and moisture permeability of biomass material
  • Method for quickly and simultaneously measuring moisture diffusion and moisture permeability of biomass material

Examples

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Embodiment 1

[0031] Embodiment 1: Moisture diffusibility and moisture permeability determination of poplar diameter section when humidity is 30%

[0032] Step 1: Cut out thin slices with a thickness of 50um on the radial section of poplar wood, and trim the section into a circle with a diameter of 1.5cm. Calculate the cross-sectional area A and volume V of the sheet.

[0033] Step 2, place the poplar flakes in step 1 on the tray of the dynamic vapor adsorption instrument, and dry to absolute dryness under the condition of 0% humidity to obtain the absolute dry mass m 0 ; Then, under the constant condition of 30% humidity, record the mass change of the slice in t time, denoted as m s , and the final equilibrium mass m e .

[0034] Step 3, the poplar wood slice in step 2 is placed between the two layers of O-shaped rubber gaskets in the diffusion cell, and 50 mg of phosphorus pentoxide is put into the diffusion cell.

[0035] Step 4, place the diffusion cell in step 3 on the tray of the ...

Embodiment 2

[0037] Embodiment 2: Moisture diffusibility and moisture permeability determination of Chinese fir string cut surface when humidity is 60%

[0038] Step 1: Cut out a thin slice with a thickness of 100um on the cut surface of the fir string, and trim the section into a circle with a diameter of 1.5cm. Calculate the cross-sectional area A and volume V of the sheet.

[0039] Step 2, place the Chinese fir flakes in step 1 on the tray of the dynamic vapor adsorption instrument, dry to absolute dryness under the condition of 0% humidity, and obtain the absolute dry mass m 0 ; Afterwards, under the constant condition of 60% humidity, record the mass change of the sheet within t time, denoted as m s , and the final equilibrium mass m e .

[0040] Step 3, place the Chinese fir slice in step 2 between two layers of O-shaped rubber gaskets in the diffusion cell, and put 100 mg of silica gel into the diffusion cell.

[0041] Step 4, place the diffusion cell in step 3 on the tray of the ...

Embodiment 3

[0043] Embodiment 3: Moisture diffusibility and moisture permeability determination of bamboo cross-section when humidity is 85%

[0044] Step 1: Cut out thin slices with a thickness of 150um on the cross-section of the bamboo, and trim the section into a circle with a diameter of 1.5cm. Calculate the cross-sectional area A and volume V of the sheet.

[0045] Step 2, place the bamboo flakes in step 1 on the tray of the dynamic vapor adsorption instrument, dry to absolute dryness under the condition of 0% humidity, and obtain the absolute dry mass m 0 ; Then, under the constant condition of 85% humidity, record the mass change of the sheet in t time, denoted as m s , and the final equilibrium mass m e .

[0046] In step 3, the bamboo sheet in step 2 is placed between two layers of O-shaped rubber gaskets in the diffusion cell, and 120 mg of calcium chloride is put into the diffusion cell.

[0047] Step 4, place the diffusion cell in step 3 on the tray of the dynamic vapor s...

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Abstract

The invention discloses a method for rapidly and simultaneously measuring moisture diffusibility and moisture permeability of a biomass material, and the method is as follows: cutting a flake from anysurface of the biomass material, and calculating cross-sectional area and volume of the flake; placing the flake on a dynamic steam adsorption instrument tray, and drying to absolute dryness under the condition of humidity of 0% to obtain the absolute dry mass m0, recording changes of mass ms of the sheet within t time under any humidity and final balance mass me; placing the sheet between gaskets of a diffusion cell, and placing a desiccant in the diffusion cell; then placing the sheet and the desiccant on the dynamic steam adsorption instrument tray, drying to absolute dryness, recording changes of total mass mt of the sheet and the desiccant within t time under any same humidity as the humidity of the step 1; and finally, substituting obtained data into a formula to calculate water diffusion coefficient and water vapor flux respectively. The method is short in time, widens measuring temperature and humidity ranges, and can quickly and simultaneously measure the moisture diffusion and the moisture permeability of the biomass material.

Description

technical field [0001] The invention belongs to the field of physical properties of biomass materials, in particular to a method for quickly and simultaneously measuring the moisture diffusibility and moisture permeability of biomass materials. Background technique [0002] Biomass materials (wood, bamboo, rattan, palm, straw, etc.) are widely used in construction, logistics transportation, packaging and other fields. During use, the moisture contained in the biomass material will change with the change of the relative humidity of the air, because the chemical components that make up the biomass material contain active groups such as hydroxyl groups, which will combine with water vapor in the air . In addition, biomass material is also a capillary porous material. After moisture enters the biomass material, it will move along capillaries with different pore sizes at different speeds. The movement of water in the pores of biomass materials is called diffusivity and moisture...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N5/02
CPCG01N5/02G01N15/08G01N2015/0866
Inventor 詹天翼吕超孙峰泽王皖皓王子衡何倩张耀丽丁涛卢晓宁
Owner NANJING FORESTRY UNIV
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