1. Mature technology
Magnesium oxide desulfurization process has been applied in many parts of the world, more than 100 projects have been applied in Japan, 95% of power stations in Taiwan are using magnesium oxide method, in addition, it has been applied in the United States, Germany and other places, and has been applied in some parts of China.
2. Sufficient sources of raw materials
The reserves of magnesium oxide in China are considerable, and the proven reserves of magnesium oxide are about 16 billion tons, accounting for about 80% of the world's total. Its resources are mainly distributed in liaoning, shandong, sichuan, hebei and other provinces, among which liaoning accounts for 84.7% of the total, followed by laizhou in shandong, which accounts for 10% of the total, the others are mainly in xingtai river in hebei, ganluo yandai and hanyuan in sichuan, subei and biegai in gansu. Therefore, magnesium oxide can be fully used as a desulfurizer in the desulfurization system of power plants.
3. High desulfurization efficiency
In terms of chemical reactivity, magnesium oxide is much larger than calcium-d desulfurizer, and the molecular weight of magnesium oxide is smaller than that of calcium carbonate and calcium oxide. Therefore, the desulfurization efficiency of magnesium oxide is higher than that of calcium method under the same other conditions. In general, the desulfurization efficiency of magnesium oxide can reach 95-98%, while the desulfurization efficiency of limestone/gypsum method can only reach 90-95%.
4. Less investment expense
As magnesium oxide desulfurization itself has its unique advantages, so the structure design in the absorption tower, the size of the amount of circulating slurry, the overall size of the system, the power of the equipment can be correspondingly small, so that the investment cost of the whole desulfurization system can be reduced by more than 20%.
5. Low operating costs
The main factors that determine the operating cost of desulfurization system are the consumption cost of desulfurizer and the consumption cost of water, electricity and steam. The price of magnesium oxide is higher than that of calcium oxide, but the amount of magnesium oxide removed by the same SO2 is 40% of that of calcium carbonate. In terms of power consumption, such as water, electricity and steam, the liquid-gas ratio is a very important factor, which is directly related to the desulfurization efficiency of the whole system and the operating cost of the system. For limestone and gypsum systems, the liquid-gas ratio is generally more than 15L/m3, and magnesium oxide is less than 7 L/m3, so magnesium oxide desulfurization process can save a large part of the cost. At the same time, the sale of magnesium oxide by-products can offset a large part of the costs.
6. Reliable operation
The biggest advantage of magnesium desulfurization method over calcium desulfurization method is that the system does not have the problem of equipment scaling and blockage, which can ensure the safe and effective operation of the whole desulfurization system. Meanwhile, the PH value of magnesium desulfurization method is controlled between 6.0 and 6.5, and the corrosion problem of equipment is also solved to a certain extent under such conditions. In general, the safety performance of magnesium desulphurization in practical engineering has a very strong guarantee.
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