Cost analysis comparison between bottled nitrogen and nitrogen generator equipment

Based on the requirements of a nitrogen generation project with a flow rate of 30 Nm³/h and a purity of 99.999%, the following calculations are performed: 1. Operating cost of bottled nitrogen: Generally, the market price of 99.999% pure nitrogen is 50 yuan/bottle. A bottle of nitrogen at 12 MPa pressure has a standard volume of 40 liters, but in practice, each bottle only contains about 5 m³. Therefore, the price of ordinary nitrogen is about 10 yuan/m³. This method is only suitable for users with very small gas consumption.

Release time:

2018-11-05

Cost analysis comparison between bottled nitrogen and nitrogen generator equipment

Using nitrogen generation equipment can save companies a considerable amount of money. The sooner you use it, the sooner you save!!!

 

Nitrogen generation project calculation based on 30Nm3/h and 99.999% nitrogen purity requirements

1. Operating cost of bottled nitrogen: The market price of 99.999% purity nitrogen is generally 50 yuan/bottle. A bottle of nitrogen has a standard volume of 40 liters under 12Mpa pressure, but in reality, each bottle only contains about 5M3. This means that the price of ordinary nitrogen per cubic meter is about 10 yuan. This method of gas use is only suitable for users with very small gas consumption.

Cost of using bottled nitrogen: 30Nm3/h × 10 yuan = 300 yuan/hour Annual cost: 300 × 8000 hours/year = 2.4 million yuan/year

2. Operating cost of liquid nitrogen: The market price of 99.999% purity liquid nitrogen is 1500 yuan/ton. One ton of liquid nitrogen can vaporize to produce about 600 cubic meters of gaseous nitrogen, and the price of nitrogen per cubic meter is about 2.5 yuan.

(Excluding the initial investment of liquid nitrogen storage tank, vaporizer, annual maintenance, and labor costs)

Cost of using liquid nitrogen: 30Nm3/h × 2.5 yuan = 75 yuan/hour Annual cost: 75 × 8000 hours/year = 600,000 yuan/year

3. Operating cost of on-site nitrogen generation (calculated based on your company's nitrogen generation project of 30Nm3/h): The operating cost of the system mainly consists of the following aspects:

1. Electricity consumption 2. Labor 3. Equipment maintenance costs 4. Equipment depreciation

Electricity consumption mainly comes from the following aspects:

Air compressor: The rated power of the air compressor is 15kw. When selecting the system, considering the unloading of the air compressor and an appropriate amount of compressed air, the actual power consumption of the air compressor is about 60% of the rated power, which is about 9kw.

Refrigerated dryer: The rated power of the refrigerated dryer is 0.58kw.

Nitrogen generator: The raw material of the nitrogen generator is compressed air, and the nitrogen generator itself basically does not consume electricity. It mainly uses instrument electricity, with a rated power of about 0.6kw.

Nitrogen purification power: 6Kw

In summary, the power consumption of the entire nitrogen generation system is: 17kw. Assuming that the electricity price is 0.7 yuan/kwh, the hourly power consumption is 17 × 0.7 = 12 yuan. This translates to a power consumption of 12 ÷ 30 = 0.4 yuan per cubic meter of finished nitrogen.

Usage cost: 30Nm3/h × 0.4 yuan = 12 yuan/hour (electricity cost) Annual cost: 12 × 8000 hours/year = 96,000 yuan/year (electricity cost)

Labor cost: Since the equipment does not require dedicated personnel to be on duty and only requires periodic and irregular inspections, the labor cost for this gas generation equipment can be calculated at 20 yuan per day when calculating the operating cost.

Equipment maintenance and maintenance costs: The maintenance and maintenance costs of the entire machine are mainly reflected in:

Air compressor Air filter element: Replaced every 4000 hours Unit price: 445 yuan/piece

Oil-gas filter element: Replaced every 8000 hours Unit price: 480 yuan/piece

Oil filter element: Replaced every 2000 hours Unit price: 346 yuan/piece

Lubricating oil: Replaced every 2000 hours Unit price: 350 yuan/time

Compressed air filter C, T, A three-stage filtration Replaced every 4000 hours: 600/3 pieces

Nitrogen generator: Oxygen analyzer probe: Replaced every two years Unit price: 580 yuan/piece

Nitrogen purification: The entire equipment does not need to replace parts, only regular checks of the stability of each part are required.

Equipment depreciation: Equipment depreciation period of ten years

4. The total investment of the 5N-30Nm3/h nitrogen generation system is 172,400 yuan (including the screw air compressor system)

1) Cost of using bottled nitrogen: 30Nm3/h × 10 yuan = 300 yuan/hour Annual cost: 300 × 8000 hours/year = 2.4 million yuan/year (excluding the initial investment of busbar equipment, pressure reducing valves, and labor operation costs)

2) Cost of using liquid nitrogen: 30Nm3/h × 2.5 yuan = 75 yuan/hour Annual cost: 75 × 8000 hours/year = 600,000 yuan/year (excluding the initial investment of liquid nitrogen tank, vaporizer, busbar equipment, pressure reducing valves, and labor operation costs)

3) Cost of the nitrogen generation system: Electricity cost + labor cost + equipment maintenance and maintenance cost + equipment depreciation Annual cost: 96,000 yuan/year (electricity cost) + 7,200 yuan/year (labor cost) + 2,830 yuan/year (maintenance cost)

+ 18,000 yuan/year (depreciation) = 124,000 yuan/year usage cost

4) Annual cost of using bottled nitrogen: 2.4 million yuan/year

Annual cost of using liquid nitrogen: 600,000 yuan/year

Annual cost of using a nitrogen generator: 124,000 yuan/year

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