Flare systems of enclosed types (also referred to as flares, flares for high-density areas or thermal oxidation flare) have a lot of advantages in comparison with high (opened) flare systems.
Advantages of closed flare systems
- no fumes
- no steam required
- no heat radiation
- no visible flame
- no odor
- low noise level
- no heat trace
- easy control system with access to any controls
- maintainability of all units from the ground (e/g. pilots may be removed without stop of whole system)
- no thermal radiation (no need to construct heat shield)
- safety liquid ans gas wastes removal
In case of flare systems, greater attention should be paid to their safety and reliability. Safe and reliable functioning of the whole flare system depends on construction and .operational capabilities of burners and also reliability of automation system based on failsafe sensors included in deadlock system, pilots and actuating mechanisms.
Well-timed closing of flare systems produced by Generation – NAO has three very important advantages:
• provides smokeless combustion of the most heavy hardly flared gaseous wastes and also wet wastes with low heating power without use of expansive steam, air blowers or opened burners and headers
• may be reconstructed to flare system of thermal oxidation by addition of draft control to natural air draft of multi-jet multi-nozzle burners
• in one combustion chamber (of standard construction or “chamber in chamber” construction), combustion of a few flows of gaseous or liquid emissions is possible.
Effectiveness of liquid and gaseous wastes combustion products for thermal oxidation flare systems exceeds 99,9%. This is the best indicator of reduction of emissions of sulfur oxides (SOx), nitrogen oxides (NOx) and other volatile cancerogenic emissions.
Enclose flare system may be equipped with one of two heat utilization systems: it can be preliminary heating (through heat exchanger) of cold wastes flow for effective combustion or boiler for receiving of vapor. If restored energy can be used at this project site, then use of both of these utilization systems should be considered.
Enclosed flare systems of Generation – NAO production high level of safety and reliability is achieved. This is provided by combination of advanced methods of development. In automation systems of enclosed flare systems most modern technological solutions and developments are applied: automatic circuit of deadlock, fluidic seals, flame scanner operating in ultraviolet band, fail-safe start-up and stop systems, light signaling, multi-stage burner heads with integrated flame arrestor, detonation prevention device and also pilots with remote spark generators and UV scanners. By separate order, supply of safety devices: gas detector, video monitors, warning horns and automatic fire fighting system is possible.
Flare system start up is possible only after checking by automatic control systems of all integrated protective means. Nozzles of multi-stage burner may start operation only after each pilot equipped with separate scanner will signal about successful ignition. In case of flame-out, fluid leakage from the seal or if it is impossible to set system to scheduled mode, automatic fail-safe stop system will start-up. This combination of automatic functions for provision of safety included to deadlock circuits that provide reliable operation of a burner, are applied in enclosed flare systems of Generation – NAO production used in high-density areas.
Fully automated multi-stage functioning of multi-nozzle, multi-jet burners with natural draft provides safe emissions reduction from oil and gas fields, oil refinery, chemical and petrochemical plants and also enterprises of processing and manufacturing industries.
