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What is the difference between CNG and PNG for gas generator sets?

CNG (Compressed Natural Gas) is natural gas compressed to 200-250 bar, stored in high-pressure steel cylinders (cascade system) at the installation site — providing on-site gas storage that can be refilled periodically. PNG (Piped Natural Gas) is natural gas delivered at low-medium pressure (typically 4-21 mbar to appliances, higher at industrial metering stations) through the city gas distribution pipeline network — providing continuous supply without on-site storage. PNG is preferred for gensets due to its continuous supply, eliminating refuelling logistics and cylinder changeover. CNG is used where PNG network is not available or where on-site storage provides supply security independent of grid gas pressure fluctuations.

What are the emission advantages of gas generator sets over diesel?

Gas generator sets offer significant emission advantages: Particulate Matter (PM/soot) — near-zero from gas engines vs 0.2-0.5 g/kWh for diesel (CPCB II); Sulphur Dioxide (SO2) — near-zero for natural gas vs proportional to diesel fuel sulphur content; Carbon Monoxide (CO) — 50-60% lower than diesel; Hydrocarbons (HC) — 30-50% lower. These advantages are why CPCB and State Pollution Control Boards encourage gas gensets in Non-Attainment Cities and restrict new diesel genset installations during severe air quality episodes. NOx emissions from gas engines are comparable to diesel (may be higher for rich-burn engines without catalyst); lean-burn gas engines with three-way catalyst achieve 90%+ NOx reduction.

What is a PESO certificate and when is it required for gas generator installations?

PESO (Petroleum and Explosives Safety Organisation) is a Government of India statutory authority under the Department for Promotion of Industry and Internal Trade that regulates the storage, transportation, and handling of petroleum, gas, and explosives. PESO approval is required for: bulk LPG storage tanks (statutory pressure vessels above 500 litres capacity); CNG cascade systems; gas regulating and metering stations above certain flow rates; and gas pipeline installations above defined pressure thresholds. PESO approval involves design submission, material specification review, third-party inspection during installation, and final certification. Operating gas storage or handling equipment without PESO approval is an offence under Petroleum Rules 2002 and Gas Cylinder Rules 2016.

What biogas production rate is needed to power a 25 kW gas generator?

A 25 kW (approximately 31 kVA) gas generator requires approximately 25 / 0.38 (electrical efficiency) = 65 kW of biogas thermal input. At biogas calorific value of approximately 6 kWh per Nm3 (for 60% methane content): 65 / 6 = approximately 11 Nm3/hour of biogas required. As a practical reference: each tonne of dairy cattle waste (cow dung slurry) produces approximately 25-40 litres of biogas per kg, or 0.025-0.040 Nm3/kg. For 11 Nm3/hour continuous supply, approximately 275-440 kg/hour of fresh cattle dung slurry feed is required — corresponding to approximately 200-350 adult dairy cattle, available from a medium-sized dairy farm.

What is cogeneration (CHP) and how does it increase energy efficiency?

Cogeneration (Combined Heat and Power, CHP) simultaneously generates electricity and usable heat from a single fuel source — recovering heat that would otherwise be wasted as exhaust and jacket cooling water heat. A conventional gas generator converts only 35-42% of fuel energy to electricity; the remaining 55-65% is heat rejected to atmosphere. CHP recovers 40-50% of this waste heat for direct use — process steam, hot water, or absorption chilling — increasing total energy utilisation to 80-90%. For industries with both electricity and thermal energy needs (hospitals, hotels, food processing, pharmaceutical), CHP reduces total energy cost by 25-40% compared to purchasing grid electricity and separate boiler fuel.