Flue gas desulfurization technology is the only large-scale commercial application of desulfurization in the world and is the main technical means of thermal power plant controlling acid rain and sulfur dioxide. There are hundreds of FGDs currently in the world. According to the existence of desulfurization products can be divided into wet state, semi-dry and dry three types of processes. These processes include: 1) wet desulfurization technology, accounting for about 85% of the total FGD installations in the world, accounting for 26.7% of the lime-gypsum method and 48.3% of other wet FGD technologies; 2) semi-dry desulfurization technology, including spray drying desulfurization technology, furnace spray absorbent / temperature activated desulfurization technology, accounting for about 10% of the total FGD installations worldwide; 3) Dry desulfurization technology, including flue gas circulating fluidized bed desulfurization technology, plasma desulfurization technology. Below we from two common wet desulfurization desulfurization agent nature, chemical reaction mechanism, technical characteristics are compared: Comparison of Properties of Desulphurization Agent by MgO Method and Limestone - Gypsum Desulfurization Process Magnesium oxide desulfurization process uses light-burned magnesium (MgO) as the desulfurization agent, and limestone-gypsum limestone powder (CaCO3) as the desulfurization agent. The two desulfurization agents have great differences in physical and chemical properties. 1.1 Physical properties Magnesium oxide (MgO) commonly known as bitter soil, the relative molecular weight of 41, white amorphous powder, odorless, non-toxic. MgO is inert to water. Especially, MgO calcined at high temperature is hard to dissolve in water and easily soluble in acid and ammonia solution. Its solubility in water increases due to the presence of carbon dioxide. Magnesia is the main component of magnesite. When magnesite heats above 640 ℃, it begins to decompose into magnesia and carbon dioxide. When calcined at 700-1000 ℃, carbon dioxide does not completely escape and becomes a powdery substance For light burned magnesium. Magnesia used for flue gas desulfurization is light burned magnesium, light burned magnesium easily soluble in water and chemical reaction. Limestone powder (CaCO3) relative molecular weight of 100, white crystal or white powder, tasteless. The relative density of 2.71 (25 ℃), stable in the air, almost insoluble in water (solubility ≈ 0.015kg / m3), insoluble in alcohol. Magnesium ions dissolve alkaline than calcium ions 10 to 15 times higher, so magnesium desulfurization process system is not prone to equipment scaling fouling problems. 1.2 chemical properties MgO is a basic oxide, with alkaline oxide connectivity, exposed to the air, easy to absorb moisture and carbon dioxide, easily with acid, ammonium salt chemical reaction. The SO2 is a basic oxide, with the general nature of acidic oxides, MgO and SO2 prone to chemical reaction, the formation of sulfate. Mg (OH) 2 + SO2 + 5H2O → MgSO3? H2O The CaCO3 is a carbonate, heated to about 1098K began to decompose into calcium oxide and carbon dioxide, calcium carbonate insoluble in water, but soluble in acid, salt and carbon dioxide. CaCO3 + SO2 + H2O → CaSO3 + CO2 ↑ + H2O The chemical reactivity of MgO and SO2 is much stronger than that of CaCO3 and SO2, and the reaction rate is faster. Comparison of the technical characteristics of magnesia method and limestone - gypsum desulfurization process 2.1 magnesia desulfurization technology features 2.1.1 The main advantages 1) technology is relatively mature. Magnesium oxide desulphurization technology is a desulphurization process whose maturity is second only to that of calcium method. Magnesium oxide desulphurization process has a lot of application achievements all over the world. At present, it has been applied more and more in parts of China. 2) sufficient sources of raw materials. Magnesium oxide reserves in our country is considerable, the current proven reserves of magnesium oxide is about 16 billion tons, accounting for about 80% of the world. Therefore, magnesium oxide can be completely used as a desulfurizer in power plant desulfurization system. 3) high desulfurization efficiency. Magnesium oxide in the chemical reaction activity is much larger than the calcium-based desulfurization agent, and magnesium oxide molecular weight than calcium carbonate and calcium oxide are small. Under normal circumstances, magnesium oxide desulfurization efficiency can reach 95 ~ 98%, while the limestone - gypsum desulfurization efficiency of only about 90 to 95%. 4) less investment costs. Because magnesium oxide has its own unique advantages as desulfurization itself, the design of the absorption tower, the size of the circulating slurry, the overall size of the system and the power of the equipment can all be relatively small. As a result, the investment in the entire desulfurization system The cost can be reduced by more than 20%. Filament Winding Fittings,Marine Pert Plastic Pipe,Marine Pert Plastic Pipe Fittings,Marine Pert Plastic Pipe For Water Supply Jingjiang Haihong Plastic & Rubeer Science -Technology Co.,Ltd , https://www.marineplasticpipe.com