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Method for sampling and detecting gas concentration in grain pile microenvironment

A technology of gas concentration and gas detectors, which is applied in the direction of sampling devices, gas mixture analysis, measuring devices, etc., can solve the problems of large actual deviation of detection results, interference with the microenvironment of sampling points, etc., to reduce the inflow velocity and inflow volume, Effects that increase realism and reduce distractions

Inactive Publication Date: 2019-09-20
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In method 2, an air pump is used to extract samples from one port of the airway tube. Due to the large amount of air pumped at the sampling port of the airway tube, the gas around the sampling point will be brought into the airway tube, which interferes too much with the microenvironment of the sampling point, resulting in detection The result deviates greatly from the actual

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  • Method for sampling and detecting gas concentration in grain pile microenvironment

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Embodiment 1

[0021] The first embodiment is a method for sampling and detecting the gas concentration in the microenvironment in the storage wheat pile, including the following steps:

[0022] A. Tube selection: select a distance 1.5m from the upper surface of the wheat pile as the sampling point (5), and determine the required air duct (4) length according to the location of the sampling point (5);

[0023] B. Fold in half: Fold the air duct (4) into two sections along the length;

[0024] C. Hole: Open 2 groups (4 in total) of 2mm diameter air inlet holes (4-1) on the pipe wall of the double-folded section of the air duct (4);

[0025] D. Positioning: Use the buried pipe tool to insert the half-folded section of the air duct (4) into the depth of the grain pile (6) so that the air inlet (4-1) is located around the sampling point (5);

[0026] E. Connect the gas detector: connect the two ends of the gas pipe (4) to the inlet and outlet of the gas detector (1) respectively. The gas pipe (4), the gas...

Embodiment 2

[0029] Embodiment 2 The method for sampling and detecting the gas concentration in the microenvironment of a rice pile includes the following steps:

[0030] A. Tube selection: Select the sampling point (5) at a distance of 2m from the upper surface, and determine the length of the required air duct (4) according to the location of the sampling point (5);

[0031] B. Fold in half: Fold the air duct (4) into two sections along the length;

[0032] C. Holes: Open 2 groups (four in total) of 2.5mm diameter air inlet holes (4-1) on the pipe wall of the double-folded section of the air duct (4);

[0033] D. Positioning: Use the buried pipe tool to insert the half-folded section of the air duct (4) into the depth of the grain pile (6) so that the air inlet (4-1) is located around the sampling point (5);

[0034] E. Connect the gas detector: connect the two ends of the gas pipe (4) to the inlet and outlet of the gas detector (1) respectively. The gas pipe (4), the gas detector (1) and the grai...

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Abstract

The invention discloses a method for sampling and detecting gas concentration in a grain pile microenvironment, and relates to the technical field of grain storage detection. The gas to be detected in the grain pile microenvironment is sampled and detected by utilizing a closed loop and a micro gas inlet on a gas guide pipe. The gas guide pipe is folded and communicates with an inlet and an outlet of a gas detector, and forms a closed loop together with the grain pile microenvironment; after the circulating gas pump is started, the sample gas is stably sucked into the gas guide pipe at a low flow rate from the small gas inlet, and circulates along the closed loop; and when the gas sample passes through the gas detector, the gas sample is sensed by the sensor, converted into a gas concentration numerical value signal and output to a display screen of the detector. Because the sample gas is stably sucked into the gas guide pipe from the small gas inlet at a low flow rate, the inlet gas flow rate and the inlet gas quantity of the gas guide pipe are reduced, and the interference of the gas on the periphery of the sampling point on the microenvironment of the sampling point is reduced, so that the gas sample is ensured to be more practical, and the sampling authenticity and the detection accuracy are greatly improved.

Description

Technical field [0001] The invention relates to the technical field of stored grain detection, and more specifically to a method for sampling and detecting the gas concentration in the microenvironment of a grain pile. Background technique [0002] In modern grain storage, it is often necessary to sample and detect the gas inside the grain pile in order to more accurately evaluate the gas concentration state in the grain pile, including changes in the gas caused by biological activities in the microenvironment of the grain pile and the pest control process. Adjust the gas concentration, fumigation and insecticide gas concentration, etc. More specifically, the large grain piles stored in the granary form a special ecological microenvironment, in which biological activities such as grain respiration, mold activities, and the occurrence of pests may cause changes in the gas concentration of the microenvironment. The gas changes can be used to monitor the stability of stored grains ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/24G01N33/00
CPCG01N1/24G01N33/0004
Inventor 王殿轩孙奂一陈亮吕建华
Owner HENAN UNIVERSITY OF TECHNOLOGY