Dual-Stage CO2 Compressor with Heat Recovery

The compression system is divided into multiple independent single-stage compressors (first single-stage compressor, second single-stage compressor, etc.), each operating at a lower compression ratio. These segmented compressors are coupled to a common drive shaft, allowing the system to achieve high overall compression ratios through sequential compression stages while maintaining simplicity in each individual compressor unit.

Instead of arranging compression stages in a linear sequence along the rotary shaft axis (which would increase shaft length), the invention arranges multiple single-stage compressors radially or in parallel around the drive shaft. This dimensional reorganization allows multiple compression stages to be accessed from different locations on the shaft without increasing its length, as each compressor can be mounted at different angular positions or levels.

The heat generated during compression, which is typically a waste product reducing efficiency, is captured and utilized by the heat recovery system. The system absorbs heat from the compressed process fluid and can reuse it for preheating feed streams or other process needs, converting the harmful thermal energy loss into a beneficial resource that improves overall system efficiency.

The drive shaft serves multiple functions simultaneously: it transmits rotational power to multiple single-stage compressors, provides mechanical coupling between compressors, and acts as a common support structure. This multi-functionality reduces the need for separate drive mechanisms for each compressor, thereby maintaining a compact overall arrangement while achieving high compression ratios through multiple stages.