Selection Skills of Roots Blower
2021-09-18
Summary
At present, most of the roots blowers on the market are three leaf type. The three-leaf Roots blower adopts two sets of three-leaf impellers, and each revolution completes 3 suction and exhaust. Belongs to the volumetric fan, is a constant volume rotation of the pneumatic machine. Simple structure and stable performance. Selection Skills of Roots Blower 1, the choice When selecting Roots blowers for sewage treatment plants, product samples from Roots blower manufacturers show performance parameters under standard intake conditions. However, the Roots blower is not in a standard state in actual use. When the environmental conditions of Roots blower such as temperature,
currently on the marketRoots blowerMostly three leaf type. trefoilRoots blowerTwo sets of three-blade impellers are used to complete 3 suction and exhaust per revolution. Belongs to the volumetric fan, is a constant volume rotation of the pneumatic machine. Simple structure and stable performance.
Roots blowerSelection skills
1, the choice
In the choice for the sewage treatment plantRoots blowerwhen,Roots blowerThe manufacturer's product sample shows the performance parameters under standard intake conditions. however,Roots blowerIn actual use is not in the standard state. WhenRoots blowerThe performance of the fan will also change when the environmental conditions such as temperature, atmospheric pressure and altitude are different. The performance parameters on the product sample cannot be used directly in the design and selection. Instead, it is necessary to convert the performance requirements of the fan into fan parameters under the standard air intake state according to the actual use state.
2, the pressure
volumetricRoots blowerThe discharge pressure does not depend on the blower itself, but on the condition of the device after the blower discharges the gas, which is determined by the so-called "back pressure. The aeration blower has the characteristics of forced air supply.Roots blowerThe discharge pressure indicated on the nameplate is the rated discharge pressure of the blower. In fact,Roots blowerIt can work at any pressure lower than the rated exhaust pressure, as long as the strength and exhaust temperature allow, it can also work at a higher than the rated exhaust pressure.
For sewage treatment plants, the back pressure generated by the exhaust system is the sum of the pressure loss value of the pipeline system, the water depth of the aeration tank and the ambient atmospheric pressure.
3. Air volume (oxygen demand)
When calculating the oxygen demand for sewage treatment, the result is the mass flow rate qm(kg/min) of oxygen required under the standard state, which is then converted into the volume flow rate qv1(m3/ min) of air required under the standard state. IfRoots blowerThe use of the state is not the standard state, for example, in the plateau area, the air density and moisture content will change,Roots blowerThe supplied air flow rate is the same as the standard state, and the mass flow rate of the supplied air will be reduced.
4. The difference between winter and summer
The choice of fan should pay attention to the change law of fan air volume. For the sameRoots blowerThe volume flow will not change in winter and summer, but the mass flow will change due to different air density, that is, different oxygen supply. This is because the winter temperature decreases and the air density increases, so the dry air mass flow supplied by the fan is greatly increased compared with the standard state, resulting in an increase in oxygen supply.
Therefore, in the process of production and operation, it is necessary to adjust the equipment in time for this change to makeRoots blowerThe oxygenation capacity is adapted to the oxygen demand in the actual operation. ForRoots blowerIt is very economical and practical to use the inverter to adjust the air supply by changing the fan speed.
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