A kind of preparation method of standard gas
A preparation method, standard gas technology, applied in mixing methods, chemical instruments and methods, gas and gas/steam mixing, etc., can solve the problems of manufacturers’ losses, affect product quality, etc., achieve accurate gas concentration, save manpower and material resources, The method is simple and reliable
Active Publication Date: 2017-06-27
KUNMING PENGYIDA GAS PROD
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Problems solved by technology
As required by the contractN 2 -O 2 10×10 -6 , assuming that it is used to calibrate the upper limit of the oxygen analyzer, the calibration gas provided by the producer must be less than 10×10 -6 , exceeding this value, the user may refuse to accept it, so it is easy to cause unnecessary losses to the manufacturer
[0004] In addition, only a single method is used to prepare standard gas in traditional gas distribution technology, such as preparing SO 2 and N 2 During the process of mixing gas, if the moisture in the bottle exceeds the standard, add SO 2 It will cause dissolution. At this time, although the number on the balance is increasing, the SO 2 It does not exist in a gaseous state, and at this time it will seriously affect the quality of the product
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Embodiment 1
[0036] N 2 —10%CO 8L / Al
[0037] The information it conveys is:
[0038] 1. The bottle of standard gas is N 2 It is confidence or balance gas (sometimes expressed in English abbreviation bal, which means balance);
[0039] 2. 10% means the volume concentration of CO in the standard gas, N 2 90%
[0040] 3. CO represents the component CO gas contained in the standard gas;
[0041]4. 8L is the volume of the cylinder;
[0042] 5. Al means aluminum alloy gas cylinder.
[0043] For carbon steel cylinders, the contract usually writes "T", such as "T40" means a 40L carbon steel cylinder. Although there is no formal standard for this abbreviation, it is generally adopted in the industry.
[0044] Calculations for this contract gas:
[0045] The total pressure of the conventional bottle of gas is: 10.0Mpa.
[0046] Ideally:
[0047] The ideal partial pressure of CO: Pco=10×10%=1.0Mpa,
[0048] N 2 The ideal partial pressure: P N2 =10×(100-10)%=9.0Mpa;
[0049] Assume tha...
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The invention relates to a preparation method of standard gas, which belongs to the technical field of standard gas preparation. The method includes several major steps such as raw material preparation, gas cylinder pretreatment, ratio calculation, gas preparation and verification. The invention cooperates with the gas Dalton partial pressure principle and the weighing method, abandons the misunderstanding of preparing standard gas by a single method in the traditional gas distribution technology, and simplifies the calculation steps based on the quality, greatly saving manpower and material resources; The method is simple and reliable, the prepared gas concentration is accurate, and has great industrial application significance.
Description
technical field [0001] The invention belongs to the technical field of standard gas preparation, and in particular relates to a preparation method of standard gas. Background technique [0002] Gas distribution by standard gas weighing method is the most accurate gas distribution method at home and abroad. Because it is based on mass weighing, it can avoid the influence of gas temperature, pressure change and compression factor on the preparation results during the standard gas preparation process. Therefore, this method is recommended by the International Organization for Standardization (ISO) to prepare a standard mixed gas standard method. However, the pressure and mass of the components required by the weighing method in the standard gas operation are completely dependent on the theoretical calculation of the real gas. [0003] At present, there are certain problems in my country's standard gas market, for example, the nominal value is the same as that of N 2 —5ppmO 2...
Claims
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IPC IPC(8): B01F3/02B01F15/04B01F23/10
Inventor 严鹏许维
Owner KUNMING PENGYIDA GAS PROD