Three blade or two blade roots blower?

When Xinqian Shun fan editor visited the forum, he found that some netizens had raised such a problem, which is described as follows: "the mixed gas of high coke oven with an inlet of 8kPa, an outlet of 0.85bar, a flow of 15000Nm3/h, and a density of 1800kcal/Nm3 (1.1kg/Nm3). The owner requested a three leaf Roots fan. After checking a lot of data, the three leaf Roots fan could not meet the requirements. The manufacturer said that the two blade roots fan can meet the requirements. Who has experience? Please help. Thank you! "

The netizen didn't know how to select it, because he was lack of knowledge about Roots blower, so he didn't know how to select it. Now let's follow the small editor of Xinqian Shun blower to see how to select this parameter.

1. Inlet pressure 8kpa

This parameter will not affect our model selection. In terms of Roots blower model selection, the pressure parameters refer to the outlet pressure, so the following parameters are what we should really care about.

2. Outlet pressure 0.85bar

0.85bar=85kpa, the outlet pressure is 85kpa, and the pressure range of Roots blower is 9.8kpa to 200kpa (reaching the limit), so the pressure of 85kpa is within the pressure range of Roots blower, and the single-stage pressure can be fully met.

3. Flow 15000Nm ³/ h

The unit for measuring air volume of general fan is m ³/ H or m ³/ Min, inlet 8kPa, Nm ³/ What is this unit? This refers to the standard square/hour. The unit conversion between the standard square and the cube is as follows: the standard square is the abbreviation of the standard cube, which is the common unit of gas flow. It is calculated by the ideal gas equation (P1 * V1)/T1=(P2 * V2) /T2 where P1 is 0.1Mpa, T1 is 273.15K (pressure and temperature under standard conditions) P2 is your absolute pressure, T2 is your actual temperature, and V2 is your actual volume.

Others: 273.15K is the Kelvin temperature, which is expressed as 0 ℃ in Celsius. The ratio of Kelvin to Celsius is one-to-one, so the Kelvin temperature is obtained by adding 273.13 to Celsius.

According to the above formula: Assume that the actual temperature is 30 ℃

According to the formula: (100kpa * 15000Nm ³/ h)/273.15K={85kpa+8KPa m)*V2}/(273.15+30)K

The result is: V2=17900.04m ³/ h=298.3m ³/ min

Thus, the actual required pressure is 85kpa, and the air volume is 298.3m ³/ min

4. Medium density 1.1kg/Nm ³

The paper density can affect the conveying capacity, but it is not very helpful for the selection of fans. We only need to select the model according to the outlet pressure and air volume.

The selection principle of general roots blower: three blade type can be selected instead of two blade type, the flow is mainly two blade type, and the pressure is large (more than 98kpa), the two-stage series type is mainly selected. According to the above parameters, the pressure is 85kpa and the air volume is 298.3m ³/ Min, according to the selection sample, select a two blade roots blower. The three blade roots blower cannot meet this parameter. If the three blade roots blower must be used, only two-stage series roots blower can be used. The parameter table of three blade high-pressure roots blower is exclusively provided!

Finally, we saw that the netizen was transporting mixed gas, and the selected Roots blower also needed special sealing. Secondly, the motor and head needed explosion-proof treatment, and the Roots blower without special treatment could not be used to transport special gas. If you have any questions about the purchase of Roots blower, you can contact our official customer service hotline.