INFINITY TURBINE LLC We specialize in designs, plans, licensing, consulting, design services, and surplus spare parts. We no longer manufacture turbines or CO2 systems. More Info...
TEL: +1-608-238-6001 (Chicago Time Zone ) USA
Email: greg@infinityturbine.com
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SMR and Cluster Mesh Supercritical CO2 Power System for Data Centers and AI Pairing Cluster Mesh Supercritical CO2 Power System with Small Modular Reactors enables hyperscalers to convert high-grade nuclear heat into ultra-efficient, dispatchable power with a compact, modular footprint tailored for AI-scale demand. More Info
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Optimal Sequencing of Compression, Heating, Recuperation, and Turbine Stages for Maximum sCO2 Turbine Work IntroductionTo maximize generator output in a supercritical CO2 (sCO2) power system, the sequencing and sizing of compression, heating, recuperation, and turbine stages must be tuned as a whole. The biggest levers are minimizing compressor work in the dense region, maximizing turbine enthalpy drop with high turbine inlet temperature, and recovering as much internal heat as possible with highly effective recuperation. The configuration that consistently delivers strong performance across practical turbine inlet temperatures and materials limits is a recuperated cycle with recompression, often augmented with reheat on the turbine side and intercooling on the compressor side.Core Principles1. Compress when CO2 is denseOperate the main compressor close to and above the critical point to keep specific work low. Intercool between compressor stages when overall pressure ratio is high.2. Add heat after compressionHeat at nearly constant pressure to raise turbine inlet temperature. Use internal heat recovery first and top up with the external heater only as needed.3. Recover heat aggressivelyHigh effectiveness recuperators raise cycle efficiency and increase turbine work for a given external heat input by preheating the compressed working fluid with turbine exhaust.4. Match pressure ratio to turbine inlet temperatureIn sCO2, the preferred pressure ratio depends strongly on turbine inlet temperature and recuperator performance. Moderate pressure ratios often yield the best net work because the compressor penalty grows quickly at higher ratios.Recommended ArchitectureA) Recompression Recuperated Brayton CycleThis is a split-flow variant of the simple recuperated cycle that boosts internal heat recovery and maintains favorable temperature profiles.Configuration1. Two or three compressor stagesMain compressor inlet slightly above the critical point.Intercooling between stages if the total pressure ratio exceeds about three.Recompressor to route a fraction of flow around the low temperature recuperator, improving recuperation and lowering the external heat requirement.2. Two recuperatorsLow temperature recuperator followed by a high temperature recuperator with high effectiveness.Design for tight pinch points and low pressure losses; these heat exchangers often dominate both cost and performance.3. External heaterBrings the working fluid from the high temperature recuperator outlet to the target turbine inlet temperature.If the heat source allows, consider supplemental electric trim heat to maintain setpoint under transients.4. One or two turbine stagesSingle-stage turbine for simplicity, sized to the chosen pressure ratio.Two-stage with reheat between stages if higher specific power is required. Reheat at pressure smooths the expansion temperature profile, increasing total work.5. Cooler and inventory controlReturn the working fluid to the dense region before the main compressor.Maintain system inventory to stay above the critical pressure in all steady states.Preferred Pressure RatioFor modern recuperated and recompression sCO2 cycles with turbine inlet temperatures in the range of about 500 to 700 degrees Celsius and high effectiveness recuperators, a moderate overall pressure ratio is typically best:Recommended pressure ratio range: about 2 to 4Practical sweet spot: about 2.5 to 3.5 for many designsWhy moderate ratiosAt low ratios, the turbine enthalpy drop is limited. At high ratios, compressor work grows and recuperator temperature differences degrade, reducing internal heat recovery and increasing required external heat. The moderate band balances a healthy turbine drop with manageable compressor work and strong recuperator performance.When to shift the ratioHigher turbine inlet temperature and excellent recuperators can support ratios near the upper end of the range.Lower turbine inlet temperature or tighter recuperator pinch generally favor the lower to mid range of the pressure ratio window.Stage Selection and Sizing GuidelinesCompressionTwo stages are sufficient for pressure ratios up to about three; add intercooling if the compressor power is a large share of net output or if the inlet temperature cannot be kept low.For ratios above three to four, use two to three stages with intercooling for best net work.RecuperationUse a high effectiveness high temperature recuperator and a well matched low temperature recuperator. Keep pressure losses low.Size the recompression split fraction to maximize internal heat recovery without overcooling the exhaust stream.TurbineSingle stage when compactness and simplicity are priorities and the pressure ratio is modest.Two stages with reheat when maximum specific power is the goal and the heat source can support the additional heater duty.HeatingPlace the main heater after the recuperators and before the turbine. If reheat is used, position a second heater between turbine stages.What Delivers the Most Turbine Work1. A recompression recuperated cycle that keeps the compressor inlet dense and cool2. High effectiveness recuperation to minimize external heat and raise the turbine inlet enthalpy3. Turbine inlet temperature set by materials and heat source, with reheat when feasible4. Overall pressure ratio in the two to four range tuned to the selected turbine inlet temperature and recuperator designConclusionTo produce the greatest turbine work for a given heat source, configure a recompression recuperated sCO2 cycle with two to three compressor stages near the dense region, high effectiveness recuperators, and one or two turbine stages with optional reheat. Target an overall pressure ratio of roughly two to four, with many practical systems landing near three. This sequence and sizing approach minimizes compressor work, maximizes the turbine enthalpy drop, and turns the available heat into the most generator output. |
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