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How to calculate the mixed flow rate of gas drainage pipeline?
To calculate the mixing amount, first measure the pressure difference using an orifice flowmeter, then calculate the mixing amount using a formula based on the pressure difference, measure the gas concentration, and then calculate the gas purity based on the product of gas concentration and mixing amount.. The unit for measuring negative pressure bai is Pa (pascal), and the flow rate is m3/min (cubic lead metal meters per minute). The flow ratio mixing method is one of the dynamic gas distribution methods, which produces standard gas by strictly controlling the flow rate of a certain proportion of component gas deficit and dilution gas, and mixing them together. Compared with preparing bottled standard gases, this method has the ability to prepare various standard gases with different component contents that meet the needs on the same gas distribution device, especially suitable for preparing low content standard gases required for atmospheric environmental monitoring. The extended data index dilution method is one of the methods for preparing low content [φ=10-6~10-9] standard gases. Its equipment is simple, the environmental conditions are not demanding, and the operation is easy. By changing the operating parameters such as the flow rate of the dilution gas, the initial content of the component gas, and the dilution time, a standard gas with a certain content of components can be quickly prepared. The standard gas component content is an exponential function of dilution time, where C represents the component content at any time T; Initial content of Co component gas; Q - Dilution gas flow rate; T - dilution time; V - Dilution bottle volume
2. Calculation of Orifice Flow Meter
The orifice plate is composed of a throttling plate with a central hole on the gas extraction pipeline, vertical sections on both sides of the orifice plate, and a pressure tapping tube. When gas flows through the orifice plate in the pipeline, the flow will form local contraction. In the case of constant total pressure, contraction will increase the flow volume and decrease the static pressure, resulting in a static pressure difference before and after the throttle plate. In the case of a curved pipeline with the same cross-section, the larger the gas flow rate, the greater the pressure difference, so the gas flow rate can be determined by measuring the pressure difference. The flow rate of the mixed gas is calculated using the following formula: Q=Kb △ h1/2 δ P δ T. The coefficient of the formula is calculated as follows: K=189.76a0mD2b=(1/(1-0.00446x)) 1/2 δ P=(PT/760) 1/2 δ T=(293/(273+t)) 1/2, where Q represents the mixed flow rate, m3/s；
3. How to calculate the drainage flow rate
The calculation of drainage flow rate is mainly carried out through the following steps: using an orifice flowmeter to measure the pressure difference: First, an orifice flowmeter needs to be used to measure the pressure difference in the pipeline.
. Orifice flowmeter is a commonly used flow measurement instrument that calculates flow rate by measuring the pressure difference generated when fluid flows thro
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