Choose nitrogen machine or choose filling nitrogen? Filling nitrogen and nitrogen machine equipment cost competition, let's analyze which way to choose is better, more cost-effective.

Generally speaking, the nitrogen we usually use has two main sources, one is liquid canned nitrogen; The second is to obtain nitrogen directly from the air.

If liquid nitrogen is canned, one ton of liquid nitrogen is equivalent to 780m3 of useful nitrogen at normal temperature and pressure; Gaseous nitrogen is produced by large nitrogen production equipment, and then disposed of by ultra-high pressure and ultra-low temperature. Usually: 500Mpa, 1800C, so that it is converted into liquid nitrogen.

If we are to input nitrogen into the furnace, the choice is gaseous nitrogen, so there must be a gasification process before the use of liquid nitrogen: pressure reduction, temperature, and several winding pipes connected to the liquid nitrogen storage tank, the outside is full of ice, and with the white fog straight up, which is the liquid nitrogen in the gasification process to absorb the temperature around the pipeline. However, if it is in the north or more cold regions, in winter, liquid nitrogen gasification needs to be assisted by other nitrogen making equipment. In addition, the liquid nitrogen in the storage tank often needs to be compensated, which also brings trouble and pressure to the acquisition and delivery. Together, many use liquid nitrogen for a long time, and the overall investment is large, and the nitrogen machine equipment can be directly transported to the furnace after the nitrogen is produced without converting liquid nitrogen, which saves a lot of steps.

There are three kinds of nitrogen making machine equipment: membrane separation nitrogen making machine equipment, PSA+ purification equipment nitrogen making machine equipment, PSA nitrogen making machine equipment: membrane separation nitrogen making machine equipment: small gas production per hour (only suitable for supporting a single furnace), and the purity of nitrogen that can be reached is low (99.9%). PSA+ purification equipment Nitrogen machine equipment, that is, "two-step method" : first use PSA to produce low pure nitrogen (99.9%), and then use "hydrogen deoxygenation", constantly input hydrogen and combustion, and low pure nitrogen oxygen attack reaction and get high pure nitrogen: H2+202=2H20, this nitrogen method defect rate is higher: PSA defect +" hydrogen deoxygenation "defect. The primary defect point of hydrogen deoxygenation: combustion equipment, which cannot continuously and consistently maintain a stable flow of hydrogen.

PSA nitrogen machine equipment uses different process skills to directly inject high purity nitrogen into the furnace.

The following is a comparison of the economy and convenience of the two nitrogen sources to see that the cost of that way is relatively low.

Nitrogen production project 10Nm3/h, nitrogen purity 99% use the requirements to calculate

1. The operating cost of bottle nitrogen

Generally, the price of 99% pure nitrogen on the market is 18 yuan/bottle, and the standard volume of a bottle of nitrogen under 12Mpa pressure is 40 liters, in fact, each bottle is only about 5M3, so it is calculated that the price of ordinary nitrogen per cubic meter is about 3.6 yuan. This method of gas use is only suitable for users with very small gas consumption.

The cost of using cylinder nitrogen: 10Nm3/h x 3.6 yuan =36 yuan/hour

Annual use cost: 36×8000 hours/year = 288,000 yuan/year The specific use cost is determined according to the customer's use

2. Operating cost of liquid nitrogen

The price of liquid nitrogen with a purity of 99.99% on the market is 1350 yuan/ton, a ton of liquid nitrogen can be vaporized to get about 640 cubic meters of gaseous nitrogen, and the price of nitrogen per cubic meter is about 2.1 yuan. (Excluding pre-invested liquid nitrogen storage tank, carburetor, annual maintenance, labor costs)

The cost of using liquid nitrogen: 10Nm3/h x 2.1 yuan =21 yuan/hour

Annual use cost: 21× 8,000 hours/year = 168,000 yuan/year

3. Operation cost of on-site nitrogen production (calculated according to 10Nm3/h nitrogen production item of your company)

The operating cost of the system mainly consists of the following aspects:

1. Consumption of electric energy

2. Labor

3, equipment maintenance costs

4. Depreciation of equipment

4, nitrogen production system FD99N-10Nm3/h

1), the cost of using cylinder nitrogen:

The cost of using cylinder nitrogen: 10Nm3/h x 3.6 yuan =36 yuan/hour

Annual use cost 36×8000 hours/year = 288,000 yuan/year (excluding the busbar equipment and pressure reducing valve and manual operation costs invested in the early period) The specific use cost is determined according to the use of customers

2), the cost of using liquid nitrogen:

The cost of using liquid nitrogen: 10Nm3/h x 2.1 yuan =21 yuan/hour

Annual use cost: 21×8000 hours/year = 168,000 yuan/year (excluding the initial input of bus equipment and pressure reducing valve and manual operation costs) The specific use cost is determined according to the use of customers

3) Cost of nitrogen production system:

Electricity + labor + equipment maintenance + depreciation of equipment

Annual usage fee: 32,000 yuan/year (electricity fee) + 2,100 yuan/year (maintenance fee) + 5,000 yuan/year (depreciation fee) = 39,000 yuan/year Usage fee The specific usage fee is determined according to the customer's use

Therefore, for the filling of nitrogen, the possibility and practicality of the use is not as good as the nitrogen machine equipment, and the two are still rarely comparable in other regions, the only thing that can be relied on is that the filling of liquid nitrogen does not require a manufacturing process and is directly used.