How to estimate the amount of compressed gas used in a year

Estimating the amount of compressed gas used in one year needs to be calculated in conjunction with production equipment parameters, operating time, gas fluctuations and losses, which can be calculated statistical method for air consumption of equipment, gas consumption per unit product method or empirical estimation method implementation. Here are the specific steps and examples:

1. equipment air consumption statistics (applicable to scenarios with known equipment parameters)

1. statistics of equipment quantity and gas consumption per unit:
   • list all equipment (such as pneumatic tools, cylinders, spray guns, etc.) that use compressed gas in the plant, and record the rated gas consumption (unit: m & sup3;/min or L/min) of each equipment.
   • If the air consumption of the equipment is in L/min, it needs to be converted to m & sup3;/min(1m & sup3;= 1000L).
2. Calculate total air consumption (instantaneous):
   • add the rated gas consumption of all equipment to obtain the instantaneous maximum gas consumption of the plant (Q_max).
   • Example: The factory has 5 sets of equipment with rated air consumption of 0.5m & sup3;/min, 0.3m & sup3;/min, 0.2m & sup3;/min, 0.4m & sup3;/min, 0.6m & sup3;/min, then Q_max = 0.5+0.3+0.2+0.4+0.6=2.0m & sup3;/min.
3. Concurrent equipment usage factor (K):
   • not all equipment will run at full capacity at the same time, and the simultaneous use factor K(0<K≤ 1) needs to be determined according to the production process.
   • Example: If K = 0.8, the actual average air consumption Q_avg = Q_max×K = 2.0 × 0.8=1.6m & sup3;/min.
4. Calculate annual gas consumption:
   • determine the annual operating time (T, unit: hour) of the equipment, taking into account production shifts, equipment downtime, etc.
   • Annual gas consumption Q_year = Q_avg × 60 ×T (unit: m & sup3;/year).
   • Example: If the equipment runs for 300 days a year and 24 hours a day, then T = 300 × 24=7200 hours, Q_year = 1.6 × 60 × 7200=691200m & sup3;/year.
5. Consider leakage and loss:
   • there is leakage in the compressed air system, and the loss coefficient needs to be increased (usually 10% ~ 20%).
   • Final annual gas consumption Q_final = Q_year ×(1 + loss rate).
   • Example: If the loss rate is 15%, then Q_final = 691200 × 1.15=794880m & sup3;/year.

2. gas consumption per unit product (applicable to scenarios where the production process is stable)

1. determination of air consumption per unit of product:
   • determine the amount of compressed gas (unit: m & sup3;/unit product) required to produce a unit product (e. g. a part, a ton of raw material) through experiments or historical data.
2. Calculate annual production:
   • according to the production plan, determine the annual output (N, unit: number of products per unit).
3. Calculate annual gas consumption:
   • annual gas consumption Q_year = gas consumption per unit product x N.
   • Example: if a product consumes 0.05m & sup3; and the annual output is 1 million pieces, then Q_year = 0.05 × 1000000=50000m & sup3;/year.
4. Consider leakage and loss:
   • the same equipment gas consumption statistics method, increase the loss coefficient (10% ~ 20%).
   • Example: If the loss rate is 15%, then Q_final = 50000 × 1.15=57500m & sup3;/year.

3. empirical estimation (for scenarios where detailed data are lacking)

1. reference industry experience value:
   • the demand for compressed gas varies greatly from industry to industry and can be estimated with reference to the industry average gas consumption.
   • Example: the gas consumption per unit output value of the mechanical processing industry is about 0.1~0.3m & sup3;/10,000 yuan, if the annual output value of the factory is 50 million yuan, the annual gas consumption is about 500~1500m & sup3;.
2. adjustment coefficient:
   • according to the actual production scale of the factory, the degree of equipment automation and other factors, the experience value is adjusted.
   • Example: If the factory has a high degree of automation, the air consumption may be high, which can be multiplied by the adjustment factor 1.2.
3. Consider leakage and loss:
   • with the previous two methods, increase the loss coefficient (10% ~ 20%).
   • Example: If the annual gas consumption is estimated to be 1000m & sup3; and the loss rate is 15%, then Q_final = 1000 × 1.15=1150m & sup3;/year.

4. considerations and optimization recommendations

1. data accuracy:
   • try to use actual measurement data and avoid relying on estimates to improve accuracy.
   • Regularly review the air consumption of the equipment to ensure that the data is updated.
2. Leak Management:
   • strengthen the leakage detection and repair of compressed air system to reduce the loss rate.
   • Example: Use ultrasonic leak detector to inspect regularly and repair leak points in time.
3. energy saving optimization:
   • according to the fluctuation of air consumption, reasonable selection of air compressor type (such as variable frequency air compressor) and operation strategy.
   • Example: During the low gas consumption period, reduce the air compressor speed or shut down some equipment to save energy.
4. recording and analysis:
   • establish a compressed gas usage ledger, record daily/monthly gas consumption, and analyze gas usage rules.
   • Example: Through data analysis, it is found that the air consumption increases abnormally in a certain period of time, and the cause is investigated in time.