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Steel Mills Environmental Emissions
Hydrogen Sulfide is dangerous to the environment, colorless, very poisonous, highly flammable gas with the characteristic foul odor of rotten eggs. With density greater than air, it tends to accumulate at the bottom of poorly ventilated spaces. Although very pungent at first, it quickly deadens the sense of smell, so potential workers may be unaware of its presence until it is too late. 800 ppmv is the lethal concentration for 50% of humans for 5 minutes exposure.
This Hydrogen Sulfide gas is a common off-gas which is produced in the Steel and Mining industry. At even very low concentration levels H2S is considered a fatal gas. H2S is commonly reduced by thermal oxidation to SO2 and SO3 for possible usage in other plant processes or if not utilized for other applications may be removed by the use of a wet scrubber.
Air pollution control by industrial engineers and H2S application specialist have often decided to use direct fired thermal oxidizer systems for the treatment of H2S and CS2 pollutants.
Many, after being involved with high fuel costs have devoted the time in research and product development to design and manufacture a regenerative thermal oxidizer that works with much reduced fuel consumption.
A Regenerative Thermal Oxidizer (RTO) is utilized to improve fuel efficiencies and to reduce NOX production that normally comes with a standard Direct-Fired Thermal Oxidizer.
Many steel and mining facilities are currently utilizing Direct-Fired Thermal Oxidizers and have more recently realized that a Regenerative Thermal Oxidizer would be a better piece of equipment when considering a direct fired thermal oxidizer's usage of fuel costs.
Many limiting factors have to be considered while designing the H2S reduction thermal oxidizer. Some considerations include; blocking any H2S from possible leakage from the regenerative thermal oxidizer system, leaking can cause premature degradation and drastically reduce the overall life of the equipment; blocking any possible fatal H2S gas to be emitted directly into the immediate atmosphere causing severe health and safety issues.
With the potential of high operating pressures, consideration should be given to the thickness of material and flow design. Many systems that have been installed have not taken into consideration high pressures which resulted in duct protrusion and fractured welded seams emitting exposure of high levels of H2S.
When designing for high outlet exhaust temperatures, considerations should be given to the type and metal thickness. These temperatures need to be above any possible condensation levels of by-products, this will reduce any formation of sulfuric acid within the exhaust system. With the high outlet temperatures the exhaust may be used to generate high pressure steam which may be used in steam operations or to power a turbine creating offset electricity.
Frequently the exhaust stack and/or the inlet process line is normally equipped with a sampling port to allow periodic stack testing. In certain global areas regulations may also require continuous monitoring of SO2 emissions. Applying a waste heat recovery system must be determined by the plant size and utility costs. Fiscal evaluations examining waste heat recovery systems applied to regenerative thermal oxidizers should be performed.
For more information about H2S reduction systems, please visit:
American Environmental Fabrication & Supply
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Frequently Asked Questions...
what are some improvements i could make on my insect mill deck?
I'm getting 2 more needle worms and 2 warm worms--- fyi
here's the list:
Doom Dozer x1
Metal Armored x1 (beatstick)
Saber Beetle x1
Shield Worm x3
Howling Insect x2
Needle worm x1
Man-Eater Bug x2
Pinch Hopper x1
Chainsaw Insect x1
Morphing Jar x1
Book of Eclipse x2
Heavy Storm x1
Insect Neglect x1
Gravekeeper's Servant x1
Pot of Avarice x1
Card Destruction x1
Verdant Sanctuary x1
Book of Moon x1
Compulsory Evacuation Device x1
Cemetary Bomb x1
Coffin Seller x1
Bottomless Trap Hole x1
Dust Tornado x1
Starlight Road x1
Scrubbed Raid x1 (if i have giga and a shield worm out this card is awesome bc i can end my own battle phase and then in main phase 2 use giga's effect to bring shield worm back to mill more)
A trap card called Assault on GHQ is great card for this deck as you destroy 1 monster on your field and mill 2 cards from your opponent's deck, its a great when combined with Warm Worm to send 5 cards from your opponents deck to the graveyard.