Two stage screw compressor is different from single stage. There are two airend in the 2 stage screw air compressor. Besides, it is energy efficient air compressor. Under the same power, rotary air compressor 2 stage can generate more air volume. For example, a 132KW two-stage air compressor has an air flow of 30m³/min. But the single stage is only 24.5m³/min.

In fact, two stage rotary screw air compressor is more suitable for large machine. If the air consumption is not large, its energy-saving advantages are not very obvious. But this is a 132KW 2-stage rotary air compressor. It can produce 22.4% more air volume. Converted into electricity, it is about CNY 80000~100000 each year. So why are many companies now choosing two stage.

(1) Bigger air discharge

The two-stage compression PM VSD air compressor provides the industry’s high air discharge. Compared with the same power air compressor, its exhaust volume is much larger. Provide sufficient compressed air for your industrial production. For example: a 2-stage compression 90kW air compressor can replace an ordinary 110kW air compressor.

(2) Energy efficient

We previously transformed a titanium chemical company. Also carried out data tests before and after the transformation. Use an air inlet energy efficiency analyzer for detection. According to the pressure and temperature, it is converted back to the air volume in the suction state. At the same time, measure the corresponding energy consumption. We use 2 stage screw compressor to replace the single stage one.

Their 132kW air compressors have potential for transformation. And they run 24 hours. Transform the airends of the four air compressors respectively. We adopted two-stage compressor airend. Use new 110kW motors and auxiliary parts. Also add 1 inverter cabinet. Reduce the unloading loss during low peak air consumption time. Ensure that the pressure of the air compressor station is constant. Reduce energy waste caused by unnecessary high voltage. In order to centrally control the air compressor, add a joint control box.

Before the transformation, the test data of four 132KW single-stage air compressors:

After the transformation, the test data of 4 sets two stage rotary screw air compressor:

To sum up: rotary air compressor 2 stage has a higher air flow. And power consumption is also less.

How much energy can a two stage industrial compressor save?
Estimate basing on actual measurement data:

Before the transformation, 4 original air compressors work at the same time. The total air production is 92.3 m/min. Total power consumption is 643.6kW.

After the transformation, 4 sets of two stage rotary screw air compressor were started. The total gas production is 110.9m/min. Total power consumption is 498.9kW. Air volume increased by 18.6m/min. Power consumption is reduced by 144.7 kW.

Assume the air compressor runs 6000 hours per year. The electricity fee is 0.65 CNY/kWh. The annual power consumption saving is 144.7×6000=868,200 kWh. The annual saving of electricity costs is 86.82×0.65=564,300 CNY. The power consumption per cubic meter before transformation is: 643.6/92.3=6.97kW/(m/min). The air volume to be increased is about 110.9-92.3=18.6m/min.

Calculate according to the current specific power consumption of 6.97kW/(m/min). The annual cost of increasing air volume: 6.97×18.6×6000×0.65=505,600 CNY/year. It is equivalent to saving electricity costs of 564,300 CNY+ 505,600 CNY= 1,069,900 CNY per year.

It combines two-stage compression rotors in one casing. And directly drive through helical gears respectively. Firstly, air passes through an air filter into the first stage of compression. Then mix with a small amount of lubricating oil in the compression chamber. At the same time, the mixed gas is compressed to the interstage pressure. The compressed air enters the cooling channel. And come into contact with a lot of oil mist. Thereby greatly reducing the temperature. Afterwards, they enters the second stage compression chamber. Perform secondary compression. They are compressed to final discharge pressure until discharged.

Q1: What’s the biggest power of your 2 stage rotary screw air compressor?

A1: The biggest power of our two stage industrial compressor is 350 HP. That is 250 kw.

Q2: What’s the delivery time of your two compression rotary air compressor?

A2: The regular production time of our 2-stage industrial air compressor is 25 days.

Q3: What is two stage screw air compressor?

A3: A rotary air compressor 2 stage is a type of industrial air compressor. It uses two stages of compression to compress air. The first stage compresses the air to a intermediate pressure. And the second stage further compresses the air to the final discharge pressure. This design is more efficient than a single-stage compressor. Because it reduces the load on the second-stage compressor. So allow it to operate at a slower speed and reducing energy consumption.