Compression ratio
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I have some questions regarding steam compressors; everyone is welcome to discuss them: 1. What is the maximum compression ratio for rotary steam compressors and centrifugal steam compressors? 2. What is the lowest allowable inlet temperature for Roots steam compressors and centrifugal steam compressors? What is the lowest vacuum level allowed for imports? 2. What is the maximum outlet temperature for Roots steam compressors and centrifugal steam compressors? What is the maximum outlet pressure?
Each case needs to be analyzed on its own; the generators associated with different brands vary
The compression ratio of a compressor is designed based on your process conditions; different processes require different compression ratios for compressors!
Should there be a theoretical range for the compression ratio? Roots or centrifugal!
Your understanding is a bit one-sided. The differential pressure capacity varies depending on the size. Centrifugal types can be further divided into roughly 3 categories: single-stage, two-stage, axial-flow, etc. For single-stage types, the maximum pressure difference is about 2.05 barg ； For a two-stage system, the maximum pressure difference is approximately 1.8 barg ； For axial flow types, the maximum pressure difference is approximately 2.2 barg; for rotary vane types, it is about 0.8 barg. Temperature, inlet pressure, and pressure difference are interrelated and function of one another, so it’s not possible to consider them as separate values……
You’re talking about pressure difference; I’m asking about the compression ratio! Thank you!
:So tell me, if a certain model has a maximum pressure difference of 10 kPa, and the inlet pressure is 101 kPa.a, then the highest outlet pressure is 111 kPa.a, right? So what is the compression ratio at this point? Is 111/101=1.099? If your inlet pressure is 90 kPa.a, is the outlet pressure 100 kPa.a? So is the compression ratio 100/90=1.11? The premise of compression ratio is the pressure difference… If the pressure difference changes, then the compression ratio will naturally be different. Don’t be so rigid in applying these principles
This post was last edited by symc on 2019-4-20 at 10:41. As long as it’s a single stage, it must be high-speed… the fluid dynamics equations determine that; electric fans don’t count……
Are you familiar with centrifugal steam compressors?