Biogas flare

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Combustion torches for flammable gas fuels (petrochemical volatile gases, flammable exhaust gases from industrial processes, biogas, etc.) are divided into internal combustion and external combustion types. I. Overview: The biogas flare is a cylindrical tower-shaped structure, with an anti-wind deflector cap at its top. It consists of components such as the tower body, burner, valves, flame arrester, and control system. The minimum amount of biogas that can be burned per hour is 300 Nm3, while the maximum is 3000 Nm3. The load can be adjusted flexibly, with a ratio of 1:10. When the amount of biogas burned per hour is below 1000 m3, natural air intake is used for combustion; when it exceeds 1000 m3, natural air intake is combined with a blower to provide forced air supply ； When biogas is mixed evenly with combustion air, it allows for complete combustion of the biogas, without any black smoke, thus being more environmentally friendly ； Forced air supply ensures that the combustion of biogas takes place entirely within the furnace, which **reduces the length of the flame and eliminates any open flame at the top of the torch** ； The burner flame is stable, combustion is complete, and flue gas emissions meet the relevant domestic emission standards. The noise level meets the national standards for regional noise in urban environments. The torch features flame-out protection, power-off safety protection, and backfire safety protection; it is easy to operate and ensures safe operation. In the event of a flameout of the permanent light or a sudden power outage, the quick shut-off valve of the flare automatically cuts off the supply of biogas. The torch features a novel design that enables it to operate reliably under various severe weather conditions (such as storms). The characteristics of continuous long-term operation of the flare were fully taken into account in system design and equipment selection, to ensure a long service life for the flare. The design of the torch complies with relevant standards such as SH3009-2001 \"Design Code for Fuel Gas Systems and Combustible Gas Emission Systems in Petrochemical Enterprises\", GB50236-98 \"Code for Welding Construction and Acceptance of Field Equipment and Industrial Pipelines\", GB3096-93 \"Urban Area Noise Emission Standards\", and \"Emission Limits for Air Pollution\". II. Structure and Characteristics 2.1 Tower Body The main shell of the flame holder is made of 304 stainless steel; there is a layer of insulating material in the middle, and the inner lining is made of high-temperature cast material, which offers properties such as heat resistance, corrosion resistance, and oxidation resistance. The surface temperature of the flame holder does not exceed 60°C, thereby ensuring a long service life for the flame holder (typically no less than ten years). 2.2 Burner: The flame burner is made of 1Gr18Ni9Ti stainless steel and features a double-layer structure; it can withstand temperatures up to 1500°C and has a long service life (typically not less than three years). 2.3 Integration of the tower and the burner: The burner is installed at the bottom of the main tower. Due to the tall height of the tower, a suction effect is created, which allows air from outside the tower to be drawn into the burner naturally. Coupled with the special design of the burner, biogas and the air required for combustion can mix evenly, resulting in more complete combustion. III. System Functions 3.1 System Functions The biogas combustion torch is an independent and complete system, primarily featuring the following functions: 1. It is capable of burning stably at a methane volume concentration of 50%, within a flow rate range of 300–3000 Nm3/h. 2. The burner and flame arrester can prevent backfire from occurring. 3. The torch is equipped with an observation hole to facilitate viewing of the flame. 4. The torch is equipped with a flame monitoring system; if no flame signal is detected, the system will automatically cut off the supply of biogas to ensure safety. 5. The ignition system uses automatic electronic ignition, and a pilot light is installed; this pilot light turns off only at extremely low pressures, remaining on for the rest of the time to ensure a high success rate of ignition. The ignition gas source is biogas, which is drawn from the main biogas pipeline, eliminating the need for a separate ignition gas supply. 6. The electric valve at the torch biogas inlet opens or closes automatically upon receiving a signal from the pressure switch in the system. 7. The torch control system features functions such as manual, automatic, and remote operation. 8. The burnout rate of the torch system is over 98%. 9. The system can automatically ignite and operate once the biogas inlet pressure reaches the set value. 10. The noise outside the system boundary is below 80 decibels. 11. During torch operation, there is no open flame at the top of the tower, and no black smoke is emitted. 3.2 Overall characteristics of the system … Adapted to the low pressure of biogas. … It has a high combustion efficiency, exceeding 98%. … Load regulation is flexible, with a regulation ratio of 1:10. … Safe burning with stable flames. … Powerful control functions, a user-friendly operating system. … It can adapt to various weather conditions. … Longer service life. … Less smoke emission. … Low noise. IV. Application Areas: Landfills, breweries, farms, wastewater treatment plants, chemical industry, energy and environmental protection, biogas projects, etc