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Based on: Industry Standards and Best Practices

Languages: English

Sample Transcript

Single stage blowers are constant speed, rotating machines. Air flows through single stage blowers are controlled by guide veins, either by a single set of inlet guide veins or by two sets of guide veins. A dual vein, single stage blower, uses two sets of veins, one on the inlet side and one on the outlet side. So they cost a bit more initially, but this design is more efficient. The outlet guide veins are used to control the aerodynamic shape or flow pattern of air as it is released from the tip of the impeller. So they control the air flow through the blower.

Vacuum Pumps, Blowers, and Ejectors

Training Time: 21 minutes

Liquid-ring vacuum pumps, centrifugal blowers, and steam ejectors are three devices that are commonly used to produce vacuum. This module explains how liquid-ring vacuum pumps create vacuum, explains why vacuum pump seal water should be cool, and describes the operation of liquid-ring vacuum pumps, single-stage and multi-stage centrifugal blowers, and steam ejectors.

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Liquid-ring vacuum pumps use a ring of water and a multi-bladed impeller that is eccentrically mounted inside the casing to create vacuum.

Seal water is often cooled in a cooling tower or heat exchanger so that it can help cool the incoming air, which increases its density and increases the vacuum level produced.

Steam ejectors use a high pressure motive fluid and venturi nozzle to create a low pressure zone, which pulls in the lower pressure suction fluid.

Learning Objectives

  • List safety hazards and safety guidelines associated with vacuum pumps, vacuum blowers, and steam ejectors
  • Explain how liquid ring vacuum pumps create vacuum
  • Explain why vacuum pump seal water should be cool
  • Identify and describe the main components of liquid ring vacuum pumps, centrifugal blowers, and steam ejectors
  • Identify and describe key process flows for a liquid ring vacuum pump
  • Describe the operation of liquid-ring vacuum pumps, centrifugal blowers, and steam ejectors
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Vacuum Pumps, Blowers, and Ejectors FAQs

How is the seal water used in liquid-ring vacuum pumps?
It seals in the pumping chambers and it also cools the incoming air

Why is it important for vacuum pump seal water to be cool?
It helps cool the incoming air, which increases its density and the vacuum level produced. It also helps avoid vaporization inside the pumps, which would reduce capacity and efficiency

How is vacuum used on a paper machine?
To help dewater the stock in the forming section, to dewater and clean the felts in the press section, and to help transfer the sheet between sections

What is the difference between a centrifugal fan and a centrifugal blower?
The American Society of Mechanical Engineers uses the "specific ratio" - the ratio of discharge pressure over suction pressure. Fans have a specific ratio up to 1.11, while blowers have specific ratios of 1.11 to 1.20.

Is a thermocompressor a type of steam ejector?
Yes. A thermocompressor is a steam ejector whose purpose is to recover the latent heat content of low pressure steam.

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