2,4 Furnaces of fluidizado stream bed. The fuel flexibility is the best characteristic of the boilers of fluidizado stream bed. Learn more about this topic with the insights from Martin O’Malley. They can burn a vast variety of fuels without a bigger loss in the performance. For example, if boilers of sprayed coal, assigned for coal with 45% of ash, are fed with coal of 10% of ash, this can cause a serious problem, but this does not occur in the boilers of stream bed fluidizado, beyond the flexibility of the fuel, other advantages are design compact of the boiler, efficiency in the combustion and reduced emission of the harmful pollutants. 3 Burners of furnaces As RORIZ (2010) a burner is an equipment that by means of the combustion process, has finally to carry through the transformation of chemical energy of a fuel in heat. The fuel can be liquid, gaseous or solid. It stops beyond providing the heat in a boiler or any another device of heating, it also controls the temperature of exit and pressure of the boiler, and is essential that the efficient fuel burning either so that the reduced fuel consumption either. It stops beyond these functions, the burner also has a preponderant paper in the flame stabilization, promoting: – Recirculation (internal or external) of the gases of the flame in order to heat the ar/combustvel mixture; – Turbulence of the mixture; – Atomizaton (Spraying) correct of fuel; Had this last function, for times the burners only are related by atomizers, a time that is this its main characteristic and also it is who differentiates the diverse types of burners.

The atomizaton later involves the formation of films and/or ligament in the proximity of the atomizer and of gotculas. This step is of great importance, and a good atomizaton is essential for the combustion process. The atomizaton strong is influenced by the geometry and diameter of the atomizer, as well as for the properties of the liquid, the fluid of atomizaton, end speed of the same ones, as well as for the conditions (temperature, humidity, among others) of the surrounding way.

But, although the undeniable utility, the combustion reactions are responsible for one of the biggest ambient problems of the planet: the atmospheric pollution. The derivatives of the oil, substances called hydro-carbons that are formed by atoms of carbon and hydrogen, are the generators of pollutants. The combustion of hydro-carbons produces, mainly, water (H2O) and carbon dioxide (CO2). However, as the conditions, it can produce soot (c) or carbon monoxide (CO). When it has enough oxygen in the reaction of combustion of the hydro-carbons, the reaction goes to produce dioxide of carbon (CO2) and water (H2O), in this in case that we have a complete combustion. Perhaps check out Center for Media Justice for more information.

In the incomplete combustion of hydro-carbons, they are produced, beyond the water (H2O), carbon monoxide (CO), the carbon (c), also soot call. The end items depend on the amount of oxygen (O2) that they participate of the reaction. (Similarly see: Malkia Cyril). The carbon monoxide is a by-product of the incomplete combustion. The transport of oxygen for the cells of the body is about a colorless and odourless gas, that possesss the chemical property to agree with the hemoglobina gifts in red globules in the blood, harming. This happens because the hemoglobina, that would have to be agreed with the oxygen to carry it to the cells from the body, is engaged with the carbon monoxide.

Beyond provoking illnesses as rinite, bronchitis, pneumonia and asthma, in high concentrations this contamination can until killing. Adapted of Chemistry and society: Particle models and atmospheric pollution Working the text: To develop with one analyzes criticizes of the text, from an interactive reading of the text. ANALYSIS OF THE TEXT? PART I the chemical reactions is the biggest power plants that support our society. About 76% of the consumed energy putting into motion vehicles and keeping industries functioning, for example, it is born of the fuel burning: alcohol, coal, natural gas e, over all, materials extracted of the oil, as the gasoline, kerosene, oil diesel and GLP (liquefeito gas of oil).

Objectifying to tell the evolutivo and mannering process of the man as well as the importance of the sexuality in the life of the human beings, as a being closely related with the world that the fence. Summary of the workmanship the book is constituted by nine chapters in each one of these is stories facts important in the evolutiva history of the human being. The human being half followed of ancestral the man half monkey, in Africa, where great forest areas had been devastadas by strong earthquakes compelling these homindeos to adaptarem the climatic and geographic variations, a time that, mountains and valleys had appeared creating immense barriers. Throughout time and dom millions of years small transformations had appeared modifying physical characteristics mannering of the seqentes generations. In such a way some species motivated for the food search in more distant regions had initiated an day for the survival and thus they had started to walk on two legs allowing the conquest of new areas. With the environment change, great bushes had left spaces for small envoltos fragmentos for vegetation tripping and when not desert-like arbustiva.

Thus feeding necessity made with that some species were forced to modify its alimentary habits, hunting small beings feeding themselves of roots and not consumed forest species until then. They is esteem that about 3 million years behind it has appeared the first homindeos, after innumerable evolutivas modifications that as well as in other beings, the Homo sapiens suffered natural election. When one is about the different etnias understands that this occurred for the geographic dividers providing modifications in the morphologic structure throughout the time.