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Method for determining water content of grain in spreading type grain drier

A grain dryer and grain moisture technology, applied in the direction of material impedance, etc., can solve the problems of poor control of grain drying, and achieve the effects of simple structure, low production cost, and convenient manufacturing and installation

Inactive Publication Date: 2006-11-22
NANJING AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the degree of drying control of the grain is also less

Method used

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  • Method for determining water content of grain in spreading type grain drier
  • Method for determining water content of grain in spreading type grain drier
  • Method for determining water content of grain in spreading type grain drier

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment selects Xudao No. 3, puts it into the cylindrical bin of the flat bin type grain dryer 1, the layer thickness is 50 cm, and the flat electrode 3 is placed on the insulating bottom plate 2 on the bottom surface, and the frequency f of the high-frequency signal E is =9000Hz, measured U 1 =2.47V, U 2 =0.93V, α=169.34°. According to the functional relationship (1) and (2), the impedance R of Xudao No. 3 is obtained m =243.230kΩ, capacitive reactance G m =1.34 -11 F, the water content ω=14.47% is obtained from the fitting function (9) or (10).

Embodiment 2

[0043] The present embodiment selects Zhou Mai 15, puts it into the cylindrical bin of the flat bin type grain dryer 1, the layer thickness is 45 cm, and the flat electrode 3 is placed on the insulating base plate 2 on the bottom surface, and the frequency of the high frequency signal E is f=5000 Hz. Measured U 1 =2.52V, U 2 =0.88V, α=166.46°. According to the functional relationship (1) and (2), the impedance R of Zhoumai 15 is obtained m =265.095kΩ, capacitive reactance C m =2.89 -11 F, the moisture content ω=10.36% is obtained from the fitting function (7) or (8).

Embodiment 3

[0045] The present embodiment selects Zhou Mai 15, puts it into the cylindrical bin of the flat bin type grain dryer 1, the layer thickness is 40 cm, and the flat electrode 3 is placed on the insulating bottom plate 2 on the bottom surface, and the frequency of the high-frequency signal E is f=9000 Hz , the measured U 1 =2.43V, U 2 =0.92V, α=169.47°. According to the functional relationship (1) and (2), the impedance R of Zhoumai 15 is obtained m =241.789kΩ, capacitive reactance C m =1.36 -11 F, the water content ω=10.36% is obtained from the fitting function (11) or (12).

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Abstract

The related moisture detection method for dried grain comprises: putting paralleled two plate electrodes on drier sides or bottom with some distance, forcing a high-frequency signal E connected to a standard resistance RH on the electrodes to generate a non-even electric field; detecting the voltage drop U1 of grain and U2 of RH and their phase difference alpha, and obtaining the Rm or Cm and then the moisture omega by electric formula and fitting function. This invention is simple and low cost.

Description

technical field [0001] The invention relates to a grain dryer, in particular to a grain moisture detection method for a flat-bin grain dryer. Background technique [0002] For the existing grain dryers, the moisture detection method for the grains placed in it generally uses two parallel plate electrodes as sensors, and uses the correlation between the electrical characteristics of the grains in a uniform electric field and the moisture content of the grains to measure the moisture content of the grains. moisture. This moisture detection method is mainly used in fluid bed and tower grain dryers, but it cannot be used in flat warehouse grain dryers. Because the flat-silo grain dryer uses the bin-type countercurrent drying method to dry the grain. The grain is fed from the upper part of the drying bin. It rotates, and revolves around the axis OO under the drive of the rotation. The hot air continuously blows into the granary from the bottom, so that the grains at the bottom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/02
Inventor 董怡为丁为民
Owner NANJING AGRICULTURAL UNIVERSITY
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