In this method, chemical substances (organic solution or inorganic solution) infiltrate into the sulfur of the coal substrate to produce soluble sulfur compounds, so as to achieve the purpose of desulfurization. According to the different characteristics of the drugs used, this method can not only remove organic sulfur, but also remove inorganic sulfur. If the control conditions are appropriate, the desulfurization efficiency will be higher. The chemical desulfurization method can remove the sulfur that cannot be removed by the physical desulfurization method, so the chemical desulfurization method is especially suitable for the desulfurization of coal with high organic sulfur content.
However, it should be noted that the desulfurization drug destroys the organic structure of the cleaned coal while the desulfurization reaction occurs, and even the drug payment reacts with the sulfur-free structure, resulting in changes in the properties of the cleaned coal. For coking coal, the structural change of such coal will lead to the decrease of adhesion and coking. Most inorganic desulfurizing drugs contain Na and K. After desulfurizing, the alkali solution of ions will inevitably adhere to some pores of coal. After coal is converted into coke, the ion catalyzes the carbon solubility reaction (CCO2=2CO-Q) in the blast furnace. Therefore, chemical desulfurization should not be easily selected for ironmaking coal desulfurization.
In recent years, hydrogen desulfurization and other methods have been studied and developed. When coal is heated, its unstable sulfur-containing structure partially decomposes to produce hydrogen sulfide. At the same time, the active free radical of coal can obtain hydrogen, which can improve the adhesion of coal. The desulfurization efficiency of this method can reach 95%. Therefore, hydrogen desulfurization method is particularly suitable for desulfurization of ironmaking coal with high organic sulfur content.
The chemical crushing method is to select drugs (ammonia) to penetrate into the coal, which can peel off the interface between pyrite and organic matter, and then separate part of pyrite through physical methods. Obviously, the desulfurization efficiency is much higher than the general physical desulfurization method, which hardly changes the characteristics of clean coal and is lower than the cost of hydrodesulfurization. It is also applicable to the development potential of ironmaking coal desulfurization.
The above is the detailed introduction about biological desulfurization introduced for you, and I hope it can help you. If you have any questions, please contact us. We will provide you with services with our attitude https://www.hneee.net
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