Does everyone have a clear understanding of how glass rotary flow meters achieve gas volume conversion in flow measurement? Faced with this, the editor has comprehensively sorted out the details of the following points. Now let’s take a look at what they all look like together?
Glass rotor flowmeter is a commonly used flow measurement instrument, suitable for measuring the flow rate of gases and liquids. When using a glass rotor flow meter, it is sometimes necessary to convert the flow rate to the volume of gas used. This article will introduce how to convert the gas volume used in the flow rate of a glass rotor flowmeter. We need to know that the measurement unit of the glass rotor flowmeter is standard cubic meters per hour (Nm) ³/ h) Or cubic meters per hour (m) ³/ h) . This refers to the volume of gas passing through a glass rotor flowmeter per hour under standard conditions (0 ℃, 1 atmospheric pressure). If we need to convert the flow rate of the glass rotor flowmeter to the volume of gas used, we can consider the following steps:
Determine the density of gas in standard state
(1) We need to know the density of a gas in its standard state. This information can be obtained by searching the gas density table. For example, at 25 ℃ and 1 atmospheric pressure, the density of air is 1.29kg/m ³。
(2) To calculate the density of a gas in a non-standard state, we need to consider the state of the gas during use. The flow rate measured by a glass rotor flowmeter is the volumetric flow rate under standard conditions, while in actual use, the gas may be in a non-standard state (such as 25 ℃ and 0.5 atmospheres). In this case, we need to convert the volumetric flow rate in the standard state to the volumetric flow rate in the non-standard state. According to the ideal gas state equation, the volume of a gas is related to temperature, pressure, and molar mass. Therefore, we can use the ideal gas state equation to calculate the density of gas in non-standard states. The ideal gas state equation is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the absolute temperature. Rewrite the above equation as the relationship between density, pressure, temperature, and molar mass: ρ= P/(nRT) where, ρ Is the gas density, P is the gas pressure, R is the gas constant, T is the absolute temperature, and n is the number of moles. We can use this relationship to calculate the density of gases in non-standard states. For example, if the pressure of a gas is 0.5 atmospheres, the temperature is 25 ℃, and the molar mass is 28g/mol (such as nitrogen), the gas density can be calculated using the following formula:
ρ= 0.5 \ times 101325/(28/22.4 \ times 8.314 \ times 298.15)=16.350527555641314kg/m ^ {3} ρ= zero point five × 101325/(28/22.4) × eight point three one four × 298.15)=16.350527555641314kg/m
(3) Calculate the volume of gas used: We can use the following formula to calculate the volume of gas used:
V=Q × T ×ρ Among them, Q is the flow rate of the glass rotor flowmeter (unit: m) ³/ H or Nm ³/ h) , t is the usage time (in hours), ρ Density of gas in non-standard state (unit: kg/m) ³）。 For example, if the flow rate of a glass rotor flowmeter is 100m ³/ h. The usage time is 2 hours, and the gas density is 1.29kg/m ³ At 25 ℃ and 1 atmospheric pressure, the volume of gas used is:
V=100 × two × 1.29=258m
Therefore, through the above steps, we can convert the flow rate of the glass rotor flowmeter to the volume of gas used. It should be noted that the pressure and temperature of the gas may change during use, so these parameters need to be recorded during use to accurately calculate the volume of gas used.
Glass rotor flowmeter is a commonly used flow measurement equipment in industrial production, which has the advantages of simple structure, convenient use, and accurate measurement. This article will provide a detailed introduction to how the flow measurement of a glass rotor flowmeter converts the volume of gas used. The flow meter shows the volume of fluid passing through a certain cross-section per unit time, usually expressed in Q, in cubic meters per second. The conversion formula is:
Q=(π d ^ 2/4) * (2Gh)
Among them, Q is the flow rate, d is the diameter of the glass tube, g is the gravitational acceleration, and h is the height at which the rotor rises.
Practical operation: When using a glass rotor flow meter, attention should be paid to the following practical operation skills: selecting a suitable flow meter: When selecting a glass rotor flow meter, it is necessary to choose the appropriate model and specification according to actual production needs to ensure measurement accuracy and stability.
Correct installation: When installing a glass rotor flow meter, it is necessary to ensure that the position and angle of the flow meter are correct to avoid measurement errors. When using a glass rotor flow meter, the following precautions should be taken:
(1) Avoid contact with corrosive liquids: The glass tube of the glass rotor flowmeter has a certain degree of corrosiveness, and contact with corrosive liquids should be avoided to avoid damage to the flowmeter or affecting the measurement results
(2) Avoid severe vibration: Glass rotor flow meters are sensitive to vibration and should avoid severe vibration or impact to avoid damage to the flow meter or affecting measurement results.
(3) Pay attention to the usage temperature: The usage temperature of the glass rotor flowmeter is limited by the tolerance range of the glass tube material. It is necessary to ensure that the usage temperature is within the allowable range to avoid damage to the flowmeter or affecting the measurement results.
Glass rotor flowmeter, as a common flow measurement equipment, has a wide range of applications in industrial production. By understanding the concepts and relationships between flow rate and volume, as well as mastering the conversion formula and practical operation skills of glass rotor flow meters, we can better meet the flow measurement needs in actual production. At the same time, it is also necessary to pay attention to precautions such as avoiding contact with corrosive liquids and maintaining dryness during use. In summary, the importance and practicality of glass rotor flow meters in industrial production cannot be ignored.
Post time: 23-01-24