As the core equipment of distributed energy systems, the selection of gas generator sets needs to balance technical performance and economic indicators. This article analyzes the key selection points from three dimensions: fuel adaptability, system efficiency, and environmental adaptability.
Fuel adaptability determines operational economy
The calorific value and combustion characteristics of different fuels directly affect the selection of units. Among the gas varieties represented by LNG, CNG, and biogas, high calorific value fuel (LNG 50MJ/m ³) can improve power generation efficiency by 8-12%, but it requires a supporting gas storage and pressure regulation system. Low calorific value biogas (20-25MJ/m ³) units require pre mixed burners, which increases equipment costs by 15%. Before selecting, it is necessary to accurately calculate the fuel supply stability and cost curve to avoid equipment being “unsuitable for the environment”.
Binary optimization path for system efficiency
The thermal efficiency of the simple cycle unit is 38-42%, and the investment payback period is about 5 years; The efficiency of the combined cycle system equipped with a waste heat boiler has been increased to 55%, but the initial investment has increased by 40%. Commercial projects should construct a full lifecycle cost model and choose an optimized path in conjunction with electricity pricing policies. A case study of an industrial park shows that by using a gas internal combustion engine and a waste heat refrigeration unit, the annual operating hours can reach 6500 hours, and the comprehensive energy utilization rate can exceed 80%.
Environmental constraints force technological upgrades
For every 1000 meters increase in altitude, the output of gas turbines decreases by 8-10%; When the ambient temperature exceeds 35 ℃, the efficiency of the cooling system decreases by 12%. The high-altitude unit can maintain its rated power through pressure compensation design, but the purchase cost increases by 25%. The new national standard has tightened the NOx emission limit to 250mg/m ³, and selective catalytic reduction (SCR) technology has become a necessary option, resulting in a corresponding increase of 0.03 yuan/kWh in operation and maintenance costs.
The integration of intelligent control systems and remote operation and maintenance platforms has become a standard feature in the industry, which can reduce downtime by more than 30%. The selection decision should establish a multidimensional evaluation matrix, coordinate technical parameters, economic indicators, and policy constraints, and achieve optimal asset allocation.
Post time: May-28-2025