The calculation of the gas consumption per minute of the equipment varies depending on the type of equipment, the operating requirements and the gas parameters. The following are the general calculation steps and formulas, as well as some examples of gas consumption calculations for specific equipment:
general Equipment Gas Consumption Calculation Formula
gas consumption of equipment (L)= gas flow rate consumed by equipment (L/min)× working time of equipment (min)× (gas pressure (bar) 1)÷ (temperature of 273 gas (℃))
- gas flow consumed by equipment: Refers to the amount of gas consumed by the equipment per unit of time, usually in liters per minute (L/min).
- Working time of equipment: Refers to the time that the equipment needs to run, usually in minutes (min).
- pressure of gas: Refers to the pressure of the gas required by the equipment, usually in bar (bar). At atmospheric pressure, the gas pressure is 1 bar, so the pressure of the gas in the formula needs to be increased by 1.
- temperature of the gas: Refers to the temperature of the gas required by the equipment, usually in degrees Celsius (°C).
Air compressor gas calculation
for air compressors, the calculation of air consumption usually involves multiple steps and factors:
clear job requirements: Including the required working pressure and flow rate. The working pressure refers to the pressure value reached when the air compressor outputs gas, and the flow rate refers to the volume of gas passing through the air compressor per unit time.
Select the appropriate air compressor model and specifications: Air compressors of different models and specifications have different displacement and power, so they must be selected according to actual needs.
Use the appropriate calculation formula:
- the basic calculation formula: gas = (work required pressure pipeline pressure loss air compressor pressure margin) * flow. Among them, the pressure required for work is determined according to the actual process requirements. The pressure loss of the pipeline is to consider the pressure drop of the gas during transportation, and the pressure margin of the air compressor is to ensure that the air compressor has a certain pressure when working stably. reserve.
- Another calculation formula: gas consumption = (working pressure x flow) ÷ (gas density x compression ratio). Among them, the compression ratio refers to the air compressor inlet and outlet gas volume ratio, which reflects the volume change of gas in the compression process.
Precautions
- gas type and purity: Different equipment may have different gas requirements, such as a gas of a specific purity or a specific gas mixture. The required gas type and purity need to be determined before calculation.
- Influencing factors: In the actual calculation, other factors need to be considered, such as air leakage, air consumption fluctuation of gas equipment, etc. These factors may lead to a certain deviation between the actual gas consumption and the calculated value, so it is necessary to make appropriate corrections in practical applications.
- Testing and estimation: For existing plants, the calculated gas consumption can be verified and calibrated by testing methods. Timed pumping test is a more accurate method to check whether the air volume or output of the existing air compressor meets the expectation.
Calculation example
taking an air compressor as an example, it is assumed that the required working pressure is 0.7 MPa (approximately equal to 7 bar) and the flow rate is 10 m & sup3;/min, the pipeline pressure loss is 0.1 MPa, the air compressor pressure margin is 0.1 MPa, and the gas density is 1.2 kg/m & sup3;, the compression ratio is 3. According to the formula, the gas consumption is about (0.7 0.1 0.1)× 10 ÷(1.2 × 3)= 2.5 m & sup3;/min.
Please note that the above calculation is only an example, and the appropriate formula and parameters should be selected according to the specific situation.
