Hydrogen mass flow meter

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1. Calculation of hydrogen production by PEM electrolysis of water

The theoretical calculation value of hydrogen production by PEM electrolysis of water is 13.971ml/minAcm2, and the actual test value is 11ml/minAcm2, with a conversion efficiency of 78.74%. The following is a detailed calculation process: conversion of current to electron number: Given 1A=1C/s, 1 Coulomb is equivalent to 6 × 101? The total amount of charge carried by an electron. Therefore, with an area of 1cm2, the number of electrons is 6 × 101? Calculation of the number of hydrogen molecules: According to the reaction equation H? O+e=H? +O?/2， 6.×101? One electron per second participates in the reaction to produce hydrogen gas, and the number of hydrogen molecules produced is also 6 × 101? Calculation of moles of hydrogen gas: 1 mole is defined as the amount of substance in a system that accurately contains 6 × 1023 basic units such as atoms or molecules. Therefore, the number of moles of hydrogen produced by 1cm2 is 6 × 101? 1/s ÷ 6. × 1023/mol=1.0362 × 10?? mol/s。 Calculation of hydrogen mass flow rate: The molar mass of hydrogen is 2g/mol, so the mass flow rate of hydrogen produced by 1cm2 is 1.0362 × 10?? mol/s × 2g/mol = 2.0724×10?? g/s = 0.020724mg/s = 1.24344mg/min。 Hydrogen gas is calculated by bending the product flow rate: the density of hydrogen gas is 0.089mg/ml, so the volume flow rate of hydrogen gas produced by 1cm2 is 1.24344mg/min ÷ 0.089mg/ml=13.971ml/min. Conversion efficiency calculation: The actual test result is 11ml/minAcm2, so the conversion efficiency is 11 ÷ 13.971=0.7874=78.74%.

2. What is a gas mass flowmeter? Gas mass flowmeter is an instrument for measuring gas flow rate, which can adapt to various gases such as corrosive gases. The principle is to measure the gas mass and convert it into volumetric flow rate. Widely used in industries such as petroleum, chemical, food, and beverage. Talking about the balance, it utilizes the energy loss caused by resistance when fluid passes through a flowmeter, accurately measuring without being affected by temperature, pressure, or corrosiveness. High precision, stability, long lifespan, supporting flexible measurement range, easy operation and maintenance. Common applications of gas mass flow meters: industrial process control, used to monitor and control various gas flow rates, such as air, hydrogen, nitrogen, natural gas, etc., applied in petrochemical, refining, chemical, power and other fields. The air compression system monitors and controls the compressed air flow, maintains system stability, saves energy, and ensures normal equipment operation. Environmental monitoring, measuring atmospheric gas flow rates such as oxygen, carbon dioxide, etc., used for atmospheric change, air quality assessment, and environmental pollution control. Laboratory research, control and measurement of experimental gas flow rates, such as fluid dynamics, chemical reactions, etc., to ensure experimental accuracy and data collection. In summary, gas mass flow meters play a crucial role in industries, environments, healthcare, and laboratories, monitoring, controlling, and optimizing gas flow rates to ensure safety, reliability, and efficiency. Different types of gas mass flow meters meet different requirements for accuracy, pressure range, and flow range.

3. How to measure hydrogen flow rate? At a pressure of 20MPa, the accuracy requirement for measuring hydrogen flow rate is 0.5%, with a flow

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