Landfill Gas Flares

In response to changing conditions on many aging landfill sites, Landfill Systems lead in the development and manufacture of modern, high performance, Low Calorie gas flares. Landfill Systems continues to provide electrical & mechanical services to the waste, environmental, renewable energy and anaerobic digestion industries. via www.landfillsystems.co.uk

About three-fourths of currently operational projects in the United States generate electricity from LFG. Electricity for onsite use or sale to the grid can be generated using a variety of technologies, including reciprocating internal combustion engines, turbines, microturbines, and fuel cells. The reciprocating engine is the most commonly used conversion technology for LFG electricity applications because of its relatively low cost, high efficiency and size ranges that complement the gas output of many landfills. Gas turbines are typically used in larger LFG energy projects while microturbines are generally used for smaller LFG volumes and in niche applications. via www.epa.gov

Candlestick Flares versus Enclosed Flares

Flares can be either open (known as Candlestick Flares) or enclosed.

Enclosed Flares

Image of an enclosed landfill gas flare.

CC BY-ND by meaduva

Enclosed flares are typically more expensive, but they provide high combustion temperatures and specific residence times as well as limit noise and light pollution. Some US states require the use of enclosed flares over open flares. Higher combustion temperatures and residence times destroy unwanted constituents such as un-burnt hydrocarbons. General accepted values are an exhaust gas temperature of 1000°C with a retention time of 0,3 seconds which is said to result in greater than 98% destruction efficiency.

Landfill gas must be treated to remove impurities, condensate, and particulates. The treatment system depends on the end use. Minimal treatment is needed for the direct use of gas in boiler, furnaces, or kilns. Using the gas in electricity generation typically requires more in-depth treatment. via en.wikipedia.org

Candlestick Flares

A candlestick flare is a simple flare that is used primarily for combusting excess landfill or other biogas generated by a municipal landfill cells or other bio-Methane producers such as bio-digestors.  Candlestick flare burn the concentrated fume which is typically 40%-55% Methane by discharging the gases through a discharge pipe and through a windshield.  As the gases discharge, they are exposed to a pilot that will initially ignite the gases.  Sustained combustion is typical without a pilot however the pilot is available to actuate as needed. Candlestick Flares are typically monitored by a thermocouple and/or UV Flare scanner for Flame activity.  A candlestick Flare will combust >98% of constituents when operated properly. via sites.google.com

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