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Method for obtaining stable wet airflow with different dew point values and special device thereof

A special device and dew point technology, applied in the field of measurement and verification, can solve the problems of large deviation between dew point and set value, sharp drop of moisture flow, deviation from set value, etc., to ensure consistency, prevent saturation rate from decreasing, reduce The effect of flow deviation

Pending Publication Date: 2021-10-01
SHANDONG NON METALLIC MATERIAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently commonly used shunt humidity generators, including flow controllers, saturators, and solenoid valves, are easily affected by downstream pressure, causing large deviations between the dew point and the set value.
When the dew point in the low humidity range occurs, the ratio of dry and wet air flow is very different. If the air resistance of the downstream instrument under test is too large, the flow rate of wet gas will drop sharply and deviate from the set value, and it will not be able to mix with dry gas normally, resulting in the failure of the dew point in the low humidity range. The phenomenon

Method used

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  • Method for obtaining stable wet airflow with different dew point values and special device thereof
  • Method for obtaining stable wet airflow with different dew point values and special device thereof
  • Method for obtaining stable wet airflow with different dew point values and special device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The split-flow humidity generating device of this embodiment is suitable for the situation where the dry gas flow is constant and the wet gas flow can be adjusted. It includes an air source, a pressure reducing valve 1, a molecular sieve dryer 3, a pressure regulating device, a venturi nozzle 6, a system, temperature control device, saturator 9, mixing chamber 10, output gas path 11 and pressure sensor, such as figure 1 shown.

[0050] The gas source is gas cylinder 2.

[0051] The pressure regulating device 4 is a pressure regulator.

[0052] Venturi nozzles 6, a total of nine, of which eight are used to transport wet air, and their flow values ​​are 1ml / min, 2ml / min, 4ml / min, 8ml / min, 16ml / min, 32ml / min, 64ml / min min and 128ml / min; one is used to deliver dry gas flow with a flow rate of 1000ml / min.

[0053] The temperature control device includes a preheating temperature control device 5 and a saturation temperature control device 8 . The preheating temperature co...

Embodiment 2

[0065] The split-flow humidity generating device of this embodiment is suitable for the situation where the flow rate of wet gas is constant and the flow rate of dry gas can be adjusted, including air source, pressure reducing valve 1, pressure regulating device, venturi nozzle 6, control system, temperature control device, Saturator 9, mixing chamber 10, output gas path 11 and pressure sensor.

[0066] The gas source is gas cylinder 2.

[0067] The pressure regulating device 4 is a pressure setting device.

[0068] There are seven Venturi nozzles in total, six of which are used to deliver dry air with flow values ​​of 1ml / min, 2ml / min, 4ml / min, 8ml / min, 16ml / min and 32ml / min; For conveying wet air, its flow rate is 800 ml / min.

[0069] The temperature control device includes a preheating temperature control device 5 and a saturation temperature control device 8 . The pre-heating temperature control device 5 is a water-bath pre-heating constant temperature bath, which is co...

Embodiment 3

[0074] The difference from Example 1 is that:

[0075] There are sixteen venturi nozzles, eight for each of dry gas delivery and wet gas delivery, and the flow values ​​are 1ml / min, 2ml / min, 4ml / min, 8ml / min, 16ml / min and 32ml / min.

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Abstract

The invention discloses a method for obtaining stable wet gas flow with different dew point values and a special device thereof, two groups of venturi nozzles are arranged and are respectively used for conveying dry gas and wet gas, at least one group of venturi nozzles comprises at least two venturi nozzles, through combination, the flow regulation resolution of the group of venturi nozzles can be as low as 1mL / min, and the flow regulation resolution of the group of venturi nozzles can be as low as 1mL / min. Therefore, under the maximum flow, the proportion of any flow of dry and wet air flow can be realized by virtue of a control system for controlling the opening and closing of the Venturi nozzle. The pressure of the whole system can be accurately controlled, the flow is kept constant, the situation that wet air flow cannot be normally converged into dry air flow due to pressure change of a downstream detected instrument is effectively avoided, the system can be used for generating stable wet air with a set dew point, the air flow is constant and accurate, and the system can serve as a standard source for detecting, calibrating or valuing dew point measuring equipment.

Description

technical field [0001] The invention belongs to the technical field of metrological verification, and relates to a method for obtaining stable wet air flow, in particular to a method for obtaining stable wet air flow with different dew point values ​​and a special device thereof. Background technique [0002] Humidity generators are widely used in the verification and calibration of humidity measurement devices such as chilled mirror dew point meters, humidity sensors, resistance-capacitance dew point meters, and electrolytic dew point meters. [0003] Humidity verification and calibration takes a long time, and it takes one day for each instrument to complete the verification and calibration work. The split-flow humidity generating device has the advantage of fast balancing speed, which can greatly improve the verification efficiency and shorten the time. Therefore, the split-flow humidity generating device is widely used. [0004] At present, the commonly used split-flow ...

Claims

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Application Information

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IPC IPC(8): G05D22/02G01N25/66G01N33/00
CPCG05D22/02G01N25/66G01N33/0006
Inventor 蔡晨辛宗伟张学范崔剑胡国星吕辉任万杰林帅王鹏李昕朱天一刘运峰张文申
Owner SHANDONG NON METALLIC MATERIAL RES INST