Istanbul: Municipal Solid Waste-to-Energy (Gasification) Feasibility + Pilot Design

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Istanbul: Municipal Solid Waste-to-Energy (Gasification) Feasibility + Pilot Design

Objective and Background

Production of syngas from municipal solid waste (MSW) in Istanbul through thermal gasification and its conversion to electricity using a high-efficiency gas engine/turbine combination: technical and economic feasibility + 1–3 t/h pilot design.
Maya’s doctoral expertise (gasification, syngas optimization) defines the core methodology.

Targets (quantitative):

  • Annual waste processed: 100,000 tons (first phase)
  • Net electricity capacity: 25 MW; annual generation: ≈180 GWh
  • CO₂e reduction: ≈95 kt/year (vs. incineration-based scenario)
  • LCOE target: ≤ ₺2.1/kWh

Scope and Assumptions

  • Feedstock: Lower heating value 8–11 MJ/kg; moisture 15–35%; composition: organics 45%, paper/cardboard 18%, plastics 12%, textiles 6%, inert 19%.
  • Gasifier: Circulating Fluidized Bed (CFB), air + enriched oxygen hybrid, bed material sand/olivine.
  • Gas cleaning: Cyclone + scrubber + tar removal (catalytic cracker) + cooling/filtration.
  • Power: 2 × 12.5 MW gas engines (high cycle efficiency, with CHP option).
  • Grid: 154 kV connection; option for integration with heat recovery.

Methodology (Step by Step)

  1. Data Collection – Seasonal sampling at 3 Istanbul transfer stations, proximate/ultimate analysis; moisture, ash, volatiles, elemental C/H/O/N/S.
  2. Scaling & Mass-Energy Balance – Aspen Plus with RGibbs approach; syngas composition (H₂, CO, CH₄, CO₂, tar) depending on waste moisture.
  3. Moisture Optimization – Drying + process heat to determine optimum range of 15–25%.
    • Figure-1: Moisture Content vs Net Power Output trend:
  4. Gas Cleaning Sizing – Targets: tar < 50 mg/Nm³, dust < 5 mg/Nm³; pressure drop, water/chemical consumption.
  5. Emission Comparison – Incineration (baseline) vs gasification (with filtration).
    • Figure-2: Emission Comparison Chart (Base=100)
  6. Net-back Electricity Cost (LCOE) – CAPEX (reactor, cleaning, power), OPEX (operations, maintenance, staff), ash/slag disposal; revenues (electricity, heat, waste intake, optional carbon credits).
  7. Legal Compliance – Turkish regulations on waste incineration/gasification emission limits, RDF criteria, environmental permits/EIA process roadmap.
  8. Pilot Design – 1–3 t/h modular CFB pilot: fuel preparation, reactor, gas cleaning skid, 500 kW engine, data collection (GC, FTIR) and safety (HAZOP).

Sample Sizing Outputs

  • Reactor load: 3.2 t/h (dry basis) @ 850–900 °C
  • Syngas HHV: 4.8–6.2 MJ/Nm³ → engine efficiency ~38%
  • Specific electricity yield: 450–520 kWh/ton waste (at 20% moisture)
  • Water for tar scrubbing: 1.2–1.6 m³/ton syngas; water treatment integration required

Deliverables

  • Feasibility report (120+ pages), Aspen files, PFD/PI&D, pilot basic design, preliminary Environmental Impact study, economic model (xls), risk/HAZOP matrix.

Timeline (12 Months)

1–3: Waste analysis and Aspen modeling
4–6: Gas cleaning and engine integration simulations
7–9: Pilot design + procurement specifications
10–12: Site installation plan + final feasibility

Risks and Mitigations

  • Tar/Fouling: Catalytic cracker + periodic steam injection
  • Moisture fluctuation: Pre-drying and flow-balancing bunker
  • Permitting: Early authority consultation + monitoring plan

Finance (summary, excl. VAT)

  • CAPEX: ~₺950 million
  • OPEX: ₺180 million/year
  • Revenue: Electricity sales (outside FIT), heat sales (CHP), waste intake fees
  • Payback: 6.5–8 years (depending on scenario)

Conclusion: Gasification, at the scale of Istanbul, has the potential to reduce CO₂e by ~32% and NOx by ~45% compared to incineration-based reference; strong indicators in energy recovery and sustainability.

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