High And Low Temperature Dry Coolers in Landfill Gas Power Generation Projects
High and Low Temperature Dry Coolers in Landfill Gas Power Generation Projects
High- and low-temperature dry coolers play a key role in landfill gas power generation projects, primarily used to purify and temperature regulate landfill gas (LFG) to improve power generation efficiency and protect equipment.
The main components of LFG are methane (CH₄, 30%~60%), carbon dioxide (CO₂, 30%~40%) and a small amount of impurities (moisture, hydrogen sulfide, siloxane, particulate matter, etc.). These impurities and high temperature and high humidity gases can cause:
Corrosion of generating units (e.g., gas turbines or internal combustion engines);
Reduce combustion efficiency;
Clogging of piping or equipment.
Application Scenarios of High and Low-Temperature Dry Coolers
(1) High temperature dry cooler (pre-cooling)
Function: Pre-cooling landfill gas from initial high temperature (usually 40~60℃) to suitable temperature (e.g. 30~40℃), so as to create conditions for subsequent treatment (e.g. desulfurization, dehydration).
Technical features:
Adopt air-cooled or water-cooled heat exchanger to reduce gas temperature;
Reduce the energy consumption of subsequent processes (e.g. lower condensation load in low temperature dehydration).
(2) Low-temperature dry cooler (deep dehumidification)
Role: Further cooling the gas in the dehydration process (e.g. down to 5~10℃), so that water and some impurities condense and precipitate out.
Technical characteristics:
Used in conjunction with condenser and separator to remove liquid water and oil mist;
Prevents icing at low temperatures (requires supporting anti-freeze design).
Core Functions and Advantages
Protects power generation equipment: reduces corrosion of gas turbines/internal combustion engines from moisture and acids.
Enhance power generation efficiency: higher methane concentration after drying, more stable combustion, and higher calorific value utilization.
Reduce O&M costs: Reduce equipment clogging and maintenance frequency, extend life.
