Why is the screw air compressor easy to accumulate water and cause the head to rust and get stuck?

Users who use screw air compressors often complain about the accumulation of water in the head of the air compressor, and some even appear on the new screw air compressor that has just been used for a short time, causing the head of the screw machine of the air compressor to rust or even get stuck and damaged, losing money and time.

First of all, we need to find out why the screw air compressor accumulates water:

definition of dew point: Under a fixed pressure, the temperature at which the gaseous water contained in the air reaches saturation and condenses into liquid water.

Our atmosphere contains water vapor, which is what we usually call humidity. This water will enter the screw air compressor with the atmosphere.

When the screw air compressor is running, the dew point of the compressed air will decrease with the increase of the pressure, but at the same time, the compression process will also generate a lot of compression heat. The oil temperature of the compressor in normal operation is designed to be above 80°C, so that the heat of compression volatilizes the water in the air into a gaseous state and discharges it to the back end with the compressed air.

If the selection of air compressor is too large, or the user's gas consumption is extremely small, the running load rate of screw machine is seriously low, which will lead to the oil temperature not reaching above 80 ℃ for a long time, even lower than the dew point. At this time, the moisture in the compressed air will condense into a liquid state and remain inside the air compressor, mixed with the lubricating oil. At this time, the oil filter and the oil core will increase the load and fail quickly. In severe cases, the oil will deteriorate and emulsify, causing the main engine rotor to rust and jam.

When the ambient temperature is 20 ℃ and the relative humidity is 100, under the pressure of 10KG, the exhaust temperature below 68 ℃ will produce condensed water. With reference to this figure, you can inquire about the temperature of condensed water under different conditions.

In the following situations, pay special attention to whether the air compressor is flooded:

factory trial production stage, capacity is not fully opened

high humidity and humid environment, such as Huangmei rainy season in Jiangnan area

unit loading rate continuously below 30%

solution

in the selection of equipment, be sure to ask professionals to choose the appropriate power of the air compressor unit.

In the case of low gas consumption or high humidity, the screw machine is shut down for 6 hours and then drain the condensate in the oil and gas barrel until the oil flows out. (Regular discharge is required, and how long it takes depends on the use environment of the screw machine)

for the air-cooled unit, the fan temperature switch can be properly adjusted and the heat dissipation can be adjusted to increase the oil temperature; for the water-cooled unit, the water intake of the cooling water can be properly adjusted to ensure the oil temperature of the air compressor. For the frequency conversion unit, the minimum operating frequency can be appropriately increased to increase the machine speed and increase the operating load.

For users with particularly small gas consumption, properly discharge the pressure of the regular back-end gas tank to artificially increase the operating load of the machine.

The use of genuine lubricating oil, a better oil-water separation, not easy to emulsify. Check the oil level before each boot to see if there is any abnormal rise or oil emulsification.