Compared with bottled nitrogen, the biggest advantage of the nitrogen machine is low cost and safe operation

Now with the use of nitrogen industry is more and more extensive, many manufacturers need to use nitrogen, nitrogen in the production process of enterprise manufacturers play a key role. So many companies are still quite dependent on nitrogen, there are many companies in the use of bottled nitrogen, but obviously the use of bottled nitrogen will increase the operating costs of enterprises. Considering the cost issue, here is why the biggest advantage of the nitrogen machine over bottled nitrogen is low cost and safe operation.

At present, there are three main ways to supply nitrogen in the market: bottled nitrogen, liquid nitrogen, and on-site nitrogen production equipment. Bottled nitrogen is mainly suitable for the use of small gas volume and particularly high gas purity; Liquid nitrogen is mainly used in occasions where the gas volume is particularly large and the purity is generally required. The on-site nitrogen machine is suitable for use in the field of gas volume of 1000Nm3/h and purity within 99.9995%. The above three gas supply methods, on-site nitrogen production equipment is the most economical and safe nitrogen supply method at present.

According to the nitrogen usage of 200Nm3/h, nitrogen purity of 99.99%, 24 hours a day, 8000 hours a year as an example, the use of the two nitrogen supply costs are compared.

Bottled nitrogen: the purity of 99.99% of nitrogen, about 45 yuan per bottle, each bottle of nitrogen at 15Mpa pressure standard volume is 6m3, the actual use of about 5.5M3, equivalent to unit nitrogen cost of about 7.5 yuan/cubic, which does not include labor, transportation and other miscellaneous costs. This is only suitable for small gas consumption customers.

Liquid nitrogen: the cost of a cubic meter of liquid nitrogen is 1000 yuan, a cubic meter of liquid nitrogen can be vaporized into 680 cubic meters of gas nitrogen, the cost of the unit of gas nitrogen is 1.4 yuan, tank, carburetor 5000 yuan/month rent. In this way, the annual cost is (1.4 yuan/cubic ×200 Nm3/h×8000 hours) + 5,000 yuan/month ×12 months =2300000 yuan.

On-site nitrogen production equipment: The cost of on-site nitrogen production equipment is mainly concentrated on equipment investment and equipment energy consumption.

Equipment investment depreciation: a set of nitrogen production equipment with gas production of 200Nm3/h and nitrogen purity of 99.99% mainly includes: air compressor, air storage tank, freeze dryer, precision filter and nitrogen machine. The investment cost of the equipment is about 1.35 million yuan, and the annual depreciation cost is 135,000 yuan according to the depreciation of ten years.

Equipment energy consumption: The main energy consumption is electric energy, which is concentrated in the air compressor, freeze dryer and nitrogen machine. According to the actual needs, the installed power of the three equipment is 160KW, 5.25KW and 0.5KW respectively. Considering the unloading of the air compressor, the actual energy consumption is about 144KW, and the total energy consumption of the electricity bill is 165.75KW/h. The electricity price is calculated at 0.6 yuan /KWH, the total cost per hour is 99.45 yuan, and the annual electricity price is 795,600 yuan based on 8,000 hours of startup.

Equipment maintenance and maintenance costs:

Machine maintenance and maintenance costs are mainly reflected in the air compressor part:

Air filter cartridge: Replace once every 4000 hours Unit price: 865 yuan/piece

Oil and gas filter element: replace once every 8000 hours unit price: 2600 yuan/piece

Oil filter element: Replace once every 4000 hours Unit price: 576 yuan/piece

Lubricating oil: Replace once every 8000 hours unit price: 960 yuan/time

Three stage filtration of compressed air filter: replace once every 4000 hours Unit price: 4500 yuan/piece

Nitrogen machine: oxygen analyzer probe, replace once every two years Unit price: 580 yuan/piece

Equipment maintenance and maintenance cost: 10081 yuan

Manual: Nitrogen machine for automatic work, no special duty, just patrol. Therefore, when calculating the operating cost of the gas equipment, the labor cost can be calculated according to 50 yuan/day.

Annual labor cost: 50×360=18000 yuan/year

The total investment of 200Nm3/h nitrogen system is calculated at 1.25 million yuan.

The cost of using liquid nitrogen:

The cost of liquid nitrogen: 200Nm3/h x 1.4 yuan/cubic =280 yuan/hour

Annual usage fee: 280 yuan/hour ×8000 hours = 2240,000 yuan/year

Tank and gasifier rent: 5000 yuan/month ×12 months =60000 yuan/year

The total cost is: the cost of liquid nitrogen + tank and gasifier rent = 2240,000 yuan/year + 60,000 yuan/year =2300000 yuan/year

PSA nitrogen system costs:

Electricity + labor + equipment maintenance + equipment depreciation

Annual usage fee: 795,600 yuan/year (electricity) + 18,000 yuan/year (labor) + 10,081 yuan/year (equipment maintenance) + 135,000 yuan/year (depreciation) =846181 yuan/year

It is not difficult to conclude from the above data that the use of nitrogen machine equipment is better than the use of bottled nitrogen, which can save a lot of money in a year, and the use of nitrogen machine equipment is safer.

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