Fume System Control
High temperature industrial operations are often subject to dust and fugitive emissions within the indoor and outdoor environment. A well-designed fume control system can enhance reduction of contaminants, increase operational performance and improve the health of workers.
Overview
The main objective for a good fume control system is always to improve indoor working conditions and outdoor environment. Historically, steel production did not require a fume system but in today’s environment, a furnace cannot operate without a fume control system, due to governmental environment and working regulations.
A Dynamic Fume Control System is designed to address the following control issues:
Control of Furnace Draft with furnace dp and upstream off-gas analyzer – to avoid Over-Drafted (high energy consumption) and Under-Drafted situations (poor in-plant air quality working conditions)
Control of Combustion Gap Position with downstream gas analyzer – to avoid drawing too much false air which reduces FCS performance and increase maintenance levels, or drawing too little air which causes safety concerns with deflagration due to quenched combustion and excess CO downstream
Control of Combustion Flame Length with downstream gas analyzer and air injection jets - to avoid flames traveling deep into the water cooled ductwork and allowing it to perform as intended to reduce gas temperature, sensible energy.
Understanding Primary FCS Performance with continuous optical temperature and velocity measurements – trend continuous measurements to allow evaluation and adjustments to avoid high/low parameters for improved performance.
Reduced FSC maintenance, operation cost and excessive revamping capital cost – DFCS Technology can dramatically improve combustion control efficiency and thereby significantly reduce fume system infrastructure & capital/revamping/operational cost ($$$)
Technical data
Dynamic fume control systems are necessary to achieve the following purposes:
- Capture only targeted fumes, energy and air
- Finalize combustion process at the earliest opportunity
- Cool down off-gas as quickly as possible to the filtering temperature
- Filter process gases
Innovation
Improved “in-EAF” energy efficiency by avoiding furnace over-drafting
Improved furnace draft capacity
Improved mixing, faster flame completion
Lower average flow rates and gas velocity in the primary system
Improved gas cooling, heat transfer efficiency
Lower gas temperature at the end of water cooled ductwork, less atomized water injection needed – less moisture in the baghouse system
Reduced maintenance cost, reduced production delays and increased equipment life expectancy
Less overall false air and dilution needs are potential for energy savings at baghouse systems during melting/refining operations or better melt shop ventilation (if needed)
Safety
The main primary feature for fume control safety is an appropriately designed and operated combustion chamber. This will ensure full completion of all combustibles, removing possibility of deflagration.
Environment
Ensure appropriate local capture of the generate fumes and emissions
Control indoor air cross drafts that effects secondary system capture
Minimizing fugitive emissions and improved indoor air quality by avoiding under-drafting
Reduced ‘false’ air, more accurate combustion air requirements
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