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Control Sample
Pioneer new controller DDJ-ERGO introduction
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. Poorly ventilated areas have tendencies to accumulate H2S due to the chemical density over air. 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.
Hydrogen Sulfide gas is produced as a common off-gas 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.
Flow design and metal thickness should be given when high operating pressures are being considered. 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.
Periodic sampling of the inlet and exhaust stream are generally taken to monitor the values. In certain global areas regulations may also require continuous monitoring of SO2 emissions. The decision to apply waste heat recovery to the regenerative thermal oxidizer depends on plant size and utility costs. Waste heat recovery economic evaluations comparing regenerative thermal oxidizers with and without systems shoudl be performed.
For more information about H2S reduction systems, please visit:
American Environmental Fabrication & Supply
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Frequently Asked Questions...
control sample POINTS FOR BEST ANSWER!!!!!?
What is the purpose for a Control sample in an experiment??
Answer:
An untouched, unaltered sample of the material being tested.
For example, if you were testing the effects of antifreeze on the growth of bean plants, you would have 4 plants living under the same conditions. Light, food, soil, pot size... all the same. you would apply antifreeze to two of the plants only. The other two would be your control group. By comparison, they would show you how much less (or more) the antifreeze plants would grow.
Controls are needed to eliminate alternate explanations of experimental results. For example, suppose a researcher feeds an experimental artificial sweetener to thirty laboratory rats and observes that eight of them subsequently die of dehydration. The underlying cause of death could be the sweetener itself or something unrelated. Perhaps the rats were simply not supplied with enough water; or the water was contaminated and undrinkable; or the rats were under some psychological or physiological stress that caused them not to drink enough; or a disease dehydrated them; or their cage was kept too hot. Eliminating each of these possible explanations individually would be time-consuming and difficult. Instead, the researcher can use an experimental control, separating the rats into two groups: one group that receives the sweetener and one that doesn't. The two groups are kept in otherwise identical conditions, and both groups are observed in the same ways. Now, any difference in morbidity between the two groups can be ascribed to the sweetener itself--and no other factor--with much greater confidence.
In other cases, an experimental control is used to prevent the effects of one variable from being drowned out by the known, greater effects of other variables. For example, suppose a program that gives out free books to children in subway stations wants to measure the effect of the program on standardized test scores. However, the researchers understand that many other factors probably have a much greater effect on standardized test scores than the free books: household income, for example, and the extent of parents' education. In scientific parlance, these are called confounding variables. In this case, the researchers can either use a control group or use statistical techniques to control for the other variables.
