According to the customer nitrogen equipment nitrogen production project 30Nm3/h, nitrogen purity of 99.999% to calculate the use of requirements
1. Operation cost calculation of bottled nitrogen
In the general market, the price of 99.999% of the bottle nitrogen nitrogen is 50 yuan/bottle, and the standard volume of a bottle of nitrogen is 40 liters under 12Mpa pressure, which is practical

Each bottle is only about 5m3, so it is calculated that the price of ordinary nitrogen per cubic meter is about 10 yuan. This type of bottle nitrogen gas is only suitable

For use with very small nitrogen gas consumption.
The cost of using cylinder nitrogen: 30Nm3/h x 10 yuan =300 yuan/hour
Annual use cost: 300×8000 hours/year = 2.4 million yuan/year
2. Operation cost calculation of liquid nitrogen
The price of liquid nitrogen with a purity of 99.999% on the market is 1500 yuan/ton, and a ton of liquid nitrogen can be vaporized to get about 600 cubic meters of gaseous nitrogen, per cubic meter

The price of nitrogen is about 2.5 yuan. (Excluding pre-invested liquid nitrogen storage tank, carburetor, annual maintenance, labor costs)
The cost of using liquid nitrogen: 30Nm3/h x 2.5 yuan =75 yuan/hour
Annual use cost: 75×8000 hours/year = 600,000 yuan/year
3. Operating cost of on-site nitrogen production of nitrogen machine equipment (calculated according to 30Nm3/h nitrogen production project of the company)
The operating cost of the nitrogen system of the complete pressure swing adsorption nitrogen machine is mainly composed of the following aspects:
1. Consumption of electric energy
2. Labor
3, equipment maintenance costs
The consumption of electric energy mainly comes from the following aspects:
Screw air compressor: Screw air compressor has a rated power of 15kw(20HP), because screw air compressor is considered in the selection of nitrogen gas station system

The unloading and appropriate compressed air allowance, so the actual power consumption of the screw air compressor is about 60% of the rated power, that is:

About 9kw.
Frozen dryer: The rated power of the frozen dryer is 0.6kw.
Pressure swing adsorption nitrogen machine equipment: the raw material of the nitrogen machine device is compressed air, and the PSA nitrogen machine itself basically does not consume electricity, which is mainly used for instrumentation

Electric, rated at approximately 0.05kw.
Nitrogen purification device power: power 5Kw
In summary, the power of the entire nitrogen nitrogen system is about 15kw
If the electricity bill is 0.7 yuan /kwh, then the electricity consumption per hour is 17×0.7=10 yuan
Converted into per cubic meter of finished nitrogen power consumption: 12÷30=0.32 yuan
Usage fee: 30Nm3/h×0.3 yuan =10 yuan/hour (electricity)
Annual usage cost: 12×8000 hours/year = 80,000 yuan/year (electricity)
Labor cost: Because the equipment does not need special personnel, only regular and irregular inspection, so the gas equipment in the calculation of operating costs, people

The work rate can be calculated at 20 yuan per day.
Nitrogen gas station equipment maintenance and maintenance costs:
Machine maintenance and maintenance costs are mainly reflected in:
1. Maintenance of screw air compressor costs more than 1,000 yuan per year;
2.5-6000 hours precision filter replacement 1000 yuan;
3. Normal service life of molecular sieve: more than 8 years.


1), the cost of using cylinder nitrogen:
The cost of using cylinder nitrogen: 30Nm3/h x 10 yuan =300 yuan/hour
Annual use cost: 300×8000 hours/year = 2.4 million yuan/year (excluding the busbar equipment and pressure reducing valve and manual operation cost invested in the early period)
2) Operating costs of liquid nitrogen
The cost of using liquid nitrogen: 30Nm3/h x 2.5 yuan =75 yuan/hour
Annual use cost: 75×8000 hours/year = 600,000 yuan/year (excluding the liquid nitrogen tank, carburetor, bus equipment, pressure reducing valve and human input in the early period)

Operating cost)
3), the cost of pressure swing adsorption nitrogen machine system:
Electricity + labor + equipment maintenance + depreciation of equipment
Annual usage fee: 96,000 yuan/year (electricity) + 7,200 yuan/year (labor) + 3,080 yuan/year (maintenance) + 18,000 yuan/year (depreciation)

) = 124,000 RMB/year usage fee
4) Annual cylinder nitrogen cost: 2.4 million yuan/year
Annual use of liquid nitrogen: 600,000 yuan/year
Annual use of nitrogen machine cost: 124,000 yuan/year