DOI: 10.5281/zenodo.17729507
title: Table 6 in ENVIRONMENTAL IMPACT ASSESSMENT (EIA) OF WORLD BANK FINANCED SIDDHIRGANJ 450 MW COMBINED CYCLE POWER PLANT (CCPP) PROJECT SIDDHIRGANJ, NARAYANGAJ

description: Table 6 (B) - Emissions Guidelines (in mgłNm 3 or as indicated) for Combustion Turbine Note: - Guidelines are applicable for new facilities. - EA may justify more stringent or less stringent limits due to ambient environment, technical and economic considerations provided there is compliance with applicable ambient air quality standards and incremental impacts are minimized. - For projects to rehabilitate existing facilities, case-by-case emission requirements should be established by the EA considering (i) the existing emission levels and impacts on the environment and community health, and (ii) cost and technical feasibility of bringing the existing emission levels to meet these new facilities limits. - EA should demonstrate that emissions do not contribute a significant portion to the attainment of relevant ambient air quality guidelines or standards, and more stringent limits may be required.
Combustion Technology ł FuelParticulate Matter (PM)Sulfur Dioxide (SO 2)Nitrogen Oxides (NOx)Dry Gas, Excess O 2 Content (%)Combustion TurbineNDA/DANDA/DANatural Gas (all turbine types of Unit> 50MWth)N/AN/AN/AN/A51 (25 ppm)15%Fuels other than Natural Gas (Unit>> 50MWth)5030Use of 1% orUse of 0.5% or152 (74 ppm) a15%less S fuelless S fuel
General notes:
- MWth = Megawatt thermal input on HHV basis; N/A = not applicable; NDA = Non-degraded airshed; DA = Degraded airshed (poor air quality); Airshed should be considered as being degraded if nationally legislated air quality standards are exceeded or, in their absence, if WHO Air Quality Guidelines are exceeded significantly; S = sulfur content (expressed as a percent by mass); Nm 3 is at one atmospheric pressure, 0 degree Celsius; MWth category is to apply to single units; Guideline limits apply to facilities operating more than 500 hours per year. Emission levels should be evaluated on a one hour average basis and be achieved 95% of annual operating hours.
- If supplemental firing is used in a combined cycle gas turbine mode, the relevant guideline limits for combustion turbines should be achieved including emissions from those supplemental firing units (e.g., duct burners).
- (a) Technological differences (for example the use of Aeroderivatives) may require different emissions values which should be evaluated on a cases-by-case basis through the EA process but which should not exceed 200 mg/Nm3.
Comparison of the Guideline limits with standards of selected countries / region (as of August 2008):
- Natural Gas-fired Combustion Turbine – NOx
o Guideline limits: 51 (25 ppm)
o EU: 50 (24 ppm), 75 (37 ppm) (if combined cycle efficiency> 55%), 50*η / 35 (where η = simple cycle efficiency)
o US: 25 ppm (> 50 MMBtu/h (≈ 14.6 MWth) and ≤ 850 MMBtu/h (≈ 249MWth)), 15 ppm (> 850 MMBtu/h (≈ 249 MWth))
o (Note: further reduced NOx ppm in the range of 2 to 9 ppm is typically required through air permit)
- Liquid Fuel-fired Combustion Turbine – NOx
o Guideline limits: 152 (74 ppm) – Heavy Duty Frame Turbines & LFO/HFO, 300 (146 ppm) – Aeroderivatives & HFO, 200 (97 ppm) – Aeroderivatives & LFO
o EU: 120 (58 ppm), US: 74 ppm (> 50 MMBtu/h (≈ 14.6 MWth) and ≤ 850 MMBtu/h (≈ 249MWth)), 42 ppm (> 850 MMBtu/h (≈ 249 MWth))
- Liquid Fuel-fired Combustion Turbine – SOx
o Guideline limits: Use of 1% or less S fuel
o EU: S content of light fuel oil used in gas turbines below 0.1% / US: S content of about 0.05% (continental area) and 0.4% (non-continental area)
Source: EU (LCP Directive 2001/80/EC October 23 2001), EU (Liquid Fuel Quality Directive 1999/32/EC, 2005/33/EC), US (NSPS for Stationary Combustion Turbines, Final Rule – July 6, 2006)
description: Published as part of NEWAZ, M. N., 2010, ENVIRONMENTAL IMPACT ASSESSMENT (EIA) OF WORLD BANK FINANCED SIDDHIRGANJ 450 MW COMBINED CYCLE POWER PLANT (CCPP) PROJECT SIDDHIRGANJ, NARAYANGAJ in null, World Bank (WB) on page 21, DOI: 10.5281/zenodo.17262486