Technical characteristics of Magnesium Oxide light fired powder desulphurization process
1. Technology maturity
Magnesium Oxide is a desulfurization desulfurization process maturity after calcium method, Magnesium Oxide desulfurization technology are applied performance very much in the world, which has been applied to more than 100 projects in Japan, Taiwan power plant 95% is used by Magnesium Oxide, also has been applied in the United States, Germany, and in some areas China has the application performance.
2. Sufficient source of raw materials
In our country, the reserves of Magnesium Oxide are very considerable. At present, the proven Magnesium Oxide reserves are about 160 million tons, accounting for about 80% of the world. Its resources are mainly in Liaoning, and Magnesium Oxide can be used as a desulphurizer in the desulfurization system of the power plant.
3. High desulfurization efficiency
In the chemical reaction activity of Magnesium Oxide is much larger than that of calcium based sorbents, and because of Magnesium Oxide's molecular weight than calcium carbonate and calcium oxide are relatively small. Therefore, under the same conditions, the desulfurization efficiency of Magnesium Oxide is higher than that of the calcium method. In general, the desulfurization efficiency of Magnesium Oxide can reach more than 95~98%, while the desulfurization efficiency of limestone / gypsum method is only about 90~95%.
4, less investment costs
Because of Magnesium Oxide as the desulfurization itself has its unique superiority, therefore in the absorption tower structure design, slurry circulation volume, system overall size, power equipment can be correspondingly smaller, so that the investment cost of the desulfurization system can be reduced by more than 20%.
5. Low operating cost
The main factors determining the operating cost of the desulfurization system are the consumption of the desulfurizer and the consumption of the water and electricity steam. The Magnesium Oxide price higher than the price of calcium oxide, but the removal of the same Magnesium Oxide SO2 dosage of calcium carbonate 40%; hydropower steam power consumption, the ratio of liquid to gas is a very important factor, it is directly related to the running cost of the whole system desulfurization efficiency and system. For limestone gypsum system, the liquid gas ratio is generally above 15L/m3, while Magnesium Oxide is below 5L/m3, so Magnesium Oxide process can save a large part of the cost. At the same time, the sale of the byproduct of Magnesium Oxide law can offset a large portion of the cost.
6. Reliable operation
The biggest advantage of calcium magnesium desulfurization method is not equipment fouling problems, to ensure the whole desulfurization system can operate safely and effectively, at the same time, magnesium pH control in 6.0~6.5, in the condition of the equipment corrosion problems have been solved to a certain extent. In general, the magnesium desulfurization in the actual project has a very strong guarantee of safety performance.
7. High comprehensive benefit
As the reaction products of magnesium desulphurization are Magnesium Sulfate and Magnesium Sulfate, the comprehensive utilization value is very high. On the one hand, we can make all the Magnesium Sulfate generated by forced oxidation, then concentrate and purify, and generate seven water Magnesium Sulfate for sale. On the other hand, we can directly calcinate and produce sulfur dioxide gas with high purity to produce sulfuric acid.
8. The use of byproducts has a broad prospect
We know that sulphuric acid is called "the mother of the chemical industry", and sulfur dioxide is the raw material for the production of sulphuric acid. China is a country with relatively lack of sulfur resources. The annual import of sulfur is more than 5 million tons and 7 million 500 thousand tons of sulfur dioxide. In addition, Magnesium Sulfate is widely used in many aspects such as food, chemical industry, medicine, agriculture and so on, and the market demand is also large. Magnesium desulphurization makes full use of existing resources and promotes the development of circular economy.
9. No two pollution
In the common wet desulphurization process, there are unavoidable problems of two pollution. For the Magnesium Oxide desulfurization technology, the follow-up treatment is more perfect, the SO2 is regenerated, and the problem of two pollution is solved.
The mechanism of desulfurization mechanism of desulfurization with calcium oxide desulfurization reaction mechanism of Magnesium Oxide Magnesium Oxide's similar, are alkaline oxides react with water to produce hydroxide and sulfur dioxide sulfite solution in water to form the neutralization reaction of the Magnesium Oxide Magnesium Sulfate and Magnesium Sulfate Asia after the recovery of SO2 after repeated use or be forced oxidation into sulfate water made of seven Magnesium Sulfate. The main chemical reactions occurring in the process of desulfurization MgOH2O=Mg (OH) 2Mg (OH) 2SO2=MgSO3H2OMgSO3H2O+SO2=Mg (HSO3) 2MgSO31/2O2=MgSO4 Magnesium Oxide main reaction regeneration stage have occurred in MgSO3, MgOSO2MgSO4, MgOSO3Mg (HSO3) 2, 2SO2SO2, SO3SO3 MgOH2O + 1/2O2 + H2O to H2SO4 when the by-product of forced oxidation of MgSO4 - 7H2O sold MgSO3 1/2O2 + to MgSO4MgSO4 + 7H2O - MgSO4 - 7H2O
Brief introduction of Magnesium Oxide process desulfurization by Magnesium Oxide currently desulfurization technology of wet desulfurization process has been commercialized operation is a kind of promising desulfurization technology, the technology is more mature, less investment, simple structure, good safety performance, and can reduce the pollution two, desulfurization agent for recycling, reduce the cost of desulfurization, can bring certain economic benefits. Compared with calcium desulfurization, to avoid a series of problems exist such as simple wet, pipe blockage, smoke temperature is too low, and there are two flue gas with water pollution and so on; at the same time and complete limestone / gypsum method, small area, low running cost, investment sharply reduced, comprehensive economic benefits great improvement.