How to select Roots blower for biogas transmission?
Features of Roots blower for biogas transmission:
Stable operation. The head of Roots blower adopts a special sealing structure, which is widely used to transport flammable and explosive gases such as biogas, coal gas, natural gas, etc. The motor adopts explosion-proof frequency conversion motor, which makes the Roots blower safer in operation, 100% gas tight, safe and reliable!
How to select the biogas transmission roots blower?
The parameters provided are the same as those of ordinary roots blowers. In addition to the normal parameters, we need to pay attention to that: the selection of roots blowers for biogas transmission should be larger. Because the actual flow value is generally less than the theoretical flow value.
The reasons are as follows:
1. Internal and external leakage loss of Roots blower
Under the effect of the inlet and exhaust pressure difference, part of the gas in the exhaust chamber returns to the inlet chamber through the rotor gap. Or the gas leaks out from the exhaust chamber of the blower through the shaft end clearance, or leaks into the vacuum pump from the atmosphere.
2. Internal leakage caused by heating
The compressed and heated gas leaks into the air inlet cavity, heating the gas from the air inlet to a certain extent, increasing its specific volume and decreasing its mass flow.
3. Heat transfer of Roots blower components Under the effect of compression heat, the temperature of the impeller and casing will rise, and the gas from the air inlet will also rise and expand when it comes in contact with them.
4. Loss of gas pressure
There is a certain pressure loss when the gas flows. These losses will be converted into heat that will be absorbed by the gas, causing the gas to rise in temperature and expansion, leading to a rise in pressure, thus increasing the leakage,
At a certain speed, the flow rate slightly decreases with the increase of pressure rise (or pressure ratio), because the leakage flow rate increases with the increase of pressure rise;
Under the condition of a certain pressure rise, the flow increases with the increase of speed. The flow curves at different speeds are roughly parallel to each other, because the theoretical flow is proportional to the speed, while the leakage flow has little relationship with the speed.
Therefore, we should select a larger size when selecting the biogas transmission roots blower, so that the flow in use can reach the theoretical flow value!
These are the points that should be paid attention to in the selection of biogas transmission roots blower. I hope they can help you!
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