Sidestream Mixing Junction for Centrifugal Compressors
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Solution Overview
Problem
Beam-style, multi-stage centrifugal compressors used in hydrocarbon processing face challenges in achieving uniform temperature and pressure fields due to improper mixing of sidestream flows, leading to performance degradation and difficulties in installing movable geometry for process adjustments.
Innovation Solution
A system and method for mixing and pressurizing process fluid streams using a driver with a rotary shaft and conduits, where the first junction is positioned at least three times the conduit diameter upstream of the compressor to efficiently combine and compress multiple fluid streams, minimizing pressure and temperature stratification and allowing for easier installation of movable geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sidestream flows are introduced through additional flanges with inlet plenums and scoop vanes to mix with working fluid, then multiple process fluid streams can be combined, but pressure and temperature stratification occurs leading to non-uniform fields and degraded compressor performance
Solution Approach 1:
The system divides the mixing function into separate components: a first junction for combining process fluid streams and a second junction for mixing with working fluid. This segmentation allows each junction to be optimized for its specific function, preventing stratification while maintaining versatility for multiple sidestream introductions.
Solution Approach 2:
The patent introduces an intermediary mixing chamber between the first junction (where process fluid streams combine) and the compressor inlet (where working fluid mixes with the combined process fluid). This intermediary chamber allows thorough mixing to occur before the fluid enters the compressor, eliminating stratification and performance degradation.
2Adaptability or versatility
If movable geometry such as movable inlet guide vanes or diffuser vanes is installed to adjust compressor performance, then process requirements can be matched, but installation becomes much more challenging due to limited space in beam-style compressors
Solution Approach 1:
The patent relocates the mixing functionality from the constrained internal space of the beam-style compressor to an external piping system with junctions positioned upstream. This dimensional shift moves the complex mixing requirements out of the limited compressor envelope, creating space for movable geometry components and their drive mechanisms.
3Ease of operation
If mixing of sidestream flow and working fluid occurs in the inlet guide immediately upstream of the impeller, then mixing can be achieved, but pressure and temperature stratification degrades downstream stage performance
Solution Approach 1:
The system performs preliminary mixing of process fluid streams at the first junction before they enter the compressor. Additionally, the extended mixing chamber provides preliminary mixing of the combined process fluid with working fluid before the fluid enters the compressor inlet guide. This preliminary action ensures uniform temperature and pressure fields, preventing stratification and protecting downstream stage performance.
Data Source
AI summary
Systems and methods are provided for sidestream mixing. The system may include a first junction formed from a plurality of conduits. The plurality of conduits may include a first conduit fluidly coupled to a compressor, the first conduit forming a first conduit diameter and configured to flow therethrough a first process fluid stream of a plurality of process fluid streams. The plurality of conduits may also include a second conduit fluidly coupled to the first conduit and the compressor, and configured to flow therethrough a second process fluid stream of the plurality of process fluid streams. The first junction may be disposed a first distance at least three times the first conduit diameter upstream of the compressor, such that the first process fluid stream and the second process fluid stream are mixed and form a first combined process fluid stream prior to being fed into and pressurized in the compressor.