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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Data Center 40 MW to 100 MW Using IT1000 Supercritical CO2 Gas Turbine Generator Silent Prime Power 1 MW (natural gas, solar thermal, thermal battery heat) ... More Info
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The Shift from AC to DC Power Production for AI Data Centers AI data centers are pushing electrical infrastructure to its limits. The traditional AC power chain is no longer optimal for GPU-driven workloads. A DC-native architecture using Infinity Turbine’s Cluster Mesh system offers a path to higher efficiency, lower costs, and scalable modular power—potentially saving tens of millions per year at hyperscale... More Info
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
ORC and Products Index Infinity Turbine ORC Index... More Info
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Natural Gas Savings for Steel Heat-Treating: Proven Measures and a CHP Microturbine Option 1) Low-friction savings (controls and tuning)These are usually the fastest paybacks.Excess-air and O₂-trim control: Tighten furnace excess air (e.g., from 20–30% down toward 10–15% where safe). Every 10% too much excess air can add ~1–2% to fuel use via stack losses. Add continuous O₂ trim on key furnaces.Burner tune-ups & staging: Annual combustion tuning; consider staged or low-NOx burners that maintain efficiency over a wider turndown.Pressure management & infiltration: Keep slight positive furnace pressure and fix door/leak paths. Cold air infiltration is a hidden fuel sink.Fan/VFD optimization: Add VFDs to recirculation and exhaust fans to modulate only what you need—less over-venting = less fuel.Typical impact: 5–15% fuel reduction across a bank of furnaces.2) Heat where it helps most: air and load preheatRecovering sensible heat from hot exhaust is the biggest lever in fired heat-treat.Recuperators (air-to-air): Preheat combustion air using flue gas.– Basic recuperators can lift air to 200–400 °C → 10–25% fuel savings.– High-efficiency metallic/ceramic units can do better if temps allow.Regenerative burners: Paired beds that swap hot/cold sides every ~20–60 s; combustion air preheat can reach 800–1,000 °C. 30–50% fuel reduction is common on continuous lines (capital is higher).Load/charge preheaters: Use exhaust to preheat the steel (or trays) upstream; even 100–200 °C preheat trims soak time and burner duty.Radiant-tube recuperators: On sealed/quench or atmosphere furnaces with radiant tubes, fit recuperative tubes to claw back tube exhaust heat.Rule of thumb: Every 100 °C of combustion-air preheat can cut main-burner fuel ~5–7%, depending on furnace type.3) Scheduling, recipes, and “time at temperature”Batch consolidation: Run at higher load density and fewer idles. Idling a hot furnace is expensive; use smart start/stop to minimize “hot idle” hours.Cycle optimization: Verify metallurgical requirements for soak time and ramp rates; many lines run conservative cycles that can be tightened with trials and hardness data.Door discipline: Minimize openings; add quick-acting doors and better seals.Typical impact: 5–10% fuel reduction without capital spend.4) Thermal envelope improvementsInsulation upgrades: Hot-face fiber, board, or IFB replacements; fix hot spots.Door/car seals: Improved ceramic fiber seals, sill maintenance.Sight ports & peeps: Use viewports with proper plugs to limit leak-in.Typical impact: 2–8% reduction; often pairs well with controls work.5) Alternatives and hybrids for certain processesInduction heating (electrification): For localized heat (shafts, gears, billets), induction can be 85–95% efficient at point-of-use and extremely fast, often reducing total energy per part—even if your kWh isn’t cheap.Oxy-fuel burners: Reduce nitrogen ballast in flue gas → lower stack loss and higher flame temperature. Fuel savings can be 10–40%, but oxygen cost must be modeled; this shines where you need high temperatures or reduced exhaust volumes.Flameless/FLOX combustion: For uniform, lower-NOx heating at high air-preheat—can support efficiency and temperature uniformity.6) Waste-heat cascade beyond the furnacesHot water/air generation: Use secondary heat exchangers on stacks for building heat, make-up air, or preheating quench tanks/washers.Thermal storage: Packed-bed or ceramic media to capture batch exhaust and return it as preheat on the next batch.7) Combined Heat & Power (CHP) with a microturbine—does it help?You asked if a microturbine could make electricity and its exhaust could heat/temper. In many steel plants, yes—when aimed at tempering ranges.What a microturbine offers (typical numbers):Electrical efficiency: ~25–33% (size and recuperation dependent).Recoverable heat: ~50–60% of fuel input in the exhaust (plus a bit from oil/generator cooling).Exhaust temperature:– Recuperated units (e.g., Capstone): ~260–320 °C exhaust.– Simple-cycle or with bypass: higher exhaust temps (~400–500 °C), lower electric efficiency.Match to process:Tempering (steel): ~150–650 °C.– Microturbine exhaust at ~260–320 °C can directly serve low• to mid-temperature tempering or be used as combustion-air preheat to a temper furnace.– For the upper end of tempering (≥400–600 °C), use supplementary firing (duct burner) to boost the turbine exhaust to setpoint.Hardening/austenitizing (>800–900 °C): CHP exhaust alone is not hot enough; still valuable for air preheat or upstream charge preheat.Why CHP can save gas:You replace purchased grid power with onsite generation (kWh), and the same NG fuel provides useful hot exhaust that would otherwise be stack loss. Net, your overall fuel utilization can reach 75–85% vs. ~40–50% in a typical utility + furnace setup.Integration options:1. Direct exhaust to a temper oven with temperature control and safety dampers.2. Exhaust-to-air recuperator → deliver hot combustion air to multiple temper furnaces.3. Exhaust + duct-firing → consistent setpoint across seasons.4. Engine-based CHP (reciprocating): lower-temp jacket water (~90 °C) + ~400–500 °C exhaust; sometimes a better temperature fit than recuperated microturbines.Quick screen for CHP feasibility:Year-round tempering heat sink ≥ 5,000 full-load hours.Electrical rate ≥ $0.10–0.12/kWh and gas ≤ $5–8/MMBtu (regional).Ability to use all recovered heat; dumping heat kills the economics.Interconnection and NOx permitting acceptable.8) What to do first (prioritized roadmap)1. Combustion audit & O₂ trim on top-3 gas users.2. Recuperator or regenerative burner retrofit on the highest-duty continuous furnace.3. Scheduling and recipe optimization to reduce idles and soak time.4. Door/seal/insulation fixes identified by a thermal camera walkdown.5. CHP pre-feasibility: match a microturbine or engine to the temper load; test two cases—direct exhaust vs. air-preheat/duct-firing.6. Induction where it pays (high-repeat small parts, shafts, gears).7. Metering & verification (stack O₂, gas flow, kWh, and part-level metrics) to lock in savings.9) Indicative savings bands (order-of-magnitude)Controls + tuning + infiltration: 5–15% gas cut.Air preheat via recuperator: 10–25% on the retrofitted furnace.Regenerative burners (continuous lines): 30–50% on that line.Scheduling/recipe optimization: 5–10% across batch equipment.CHP serving tempering heat: site-wide fuel use flat to mildly higher, but total energy cost typically drops 10–25% (depends on tariffs, spark spread) while gas per unit of useful output falls due to heat recovery.10) Decision support you can run quicklyTop 5 furnaces (type, setpoints, duty hours, stack temps)Annual gas (MMBtu) and electricity (kWh) by areaElectric tariff (energy + demand) and gas $/MMBtu |
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