Power plant desulfurization of lime powder fineness requirements
Lime powder is an important desulfurization agent for power plant desulfurization, which can effectively remove the sulfur dioxide in the tail gas after coal combustion for its tail gas, has reached the safety standards for tail gas emissions, but the desulfurization of the powder has certain requirements, how much fineness is required for power plant desulfurization of lime powder?
Lime powder desulfurizer is how the tail gas desulfurization?
Power plant desulfurization grinding equipment in the ground lime powder with compressed air jet to the furnace reaction effect better temperature zone, so that the lime powder and flue gas have good contact and reaction time, the main component of limestone powder is calcium carbonate (CaCO3), when encountered at high temperatures will be decomposed into calcium oxide (Cao) and carbon dioxide (CO2), at this time, calcium oxide and sulfur dioxide in the state of oxygen began to react to produce Calcium sulfate (CaSO4) and separated from the gas, calcium sulfate is the main component of industrial gypsum, can be exchanged into the next stage of production, it can be said that the principle of desulfurization of the power plant is to use the chemical properties of the elements in nature to achieve the specific chemical reaction equation is as follows:
CaCO3→Cao+CO2
CaO+SO2+1/2O2→CaSO4
In addition, from the chemical reaction can be seen limestone desulfurization is also achieved after its high temperature decomposition into calcium oxide, which shows that the effect of calcium oxide desulfurization is much better than calcium carbonate, but both can be used for power plant desulfurization use, from calcium carbonate to calcium oxide requires high temperature calcination to complete, which requires the construction of a calcining kiln to achieve, and thus the cost will be greatly increased, the majority of the power plant desulfurization is the choice of lime powder is directly via the Grinding mill for use, special desulfurization requirements are very strict power plant to increase investment in the selection of calcium oxide desulfurization, calcium carbonate is generally used in the furnace desulfurization mostly, and calcium oxide is used for chimney desulfurization.
Through the above working principle of power plant desulfurization we can learn: power plant desulfurization since it relies on chemical reaction to complete, the natural reaction effect the fuller the better, and the reaction of the reaction and the reaction effect in addition to the nature of the elements themselves, in addition to the external conditions are also very important, such as temperature, contact area, etc., in the power plant furnace strong temperature can be selected to the optimal temperature for the blowing, but how to increase the contact area? In fact, it is not difficult to improve the fineness of the desulfurization agent, which also requires power plant desulfurization mill finished particles must be sufficiently detailed and uniform in order to better achieve the chemical reaction, the finer the fineness of the lime powder, the more detailed the chemical reaction is more adequate, the better the effect of desulfurization. If the pursuit of fineness natural micro-powder mill, three-ring medium-speed mill and other ultra-fine powder grinding equipment is the most appropriate, but the powder grinding also needs to consume a certain amount of energy, the finer the finer the energy consumption, the more energy consumption, compared to the enterprise to divide the cost of production is also the better.
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