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Light-burning Magnesium Spherical Tower-Magnesium Oxide Desulfurization Method Suitable for New and Old Boilers
Technical characteristics of magnesium oxide desulfurization process
1. Technological maturity
Magnesium oxide desulfurization technology with light burnt magnesia sphere is a kind of desulfurization technology with maturity second only to calcium method. Magnesium oxide desulfurization technology has a lot of application achievements all over the world. Magnesium oxide desulfurization technology has been applied in more than 100 projects in Japan, 95% of Taiwan's power plants are using magnesium oxide method, in addition, it has been applied in the United States, Germany and other places. At present, it has been applied in some parts of China. Use performance.
2. Adequate sources of raw materials
Magnesium oxide reserves in China are considerable. At present, the proven reserves of magnesium oxide are about 16 billion tons, accounting for about 80% of the world. Its resources are mainly in Liaoning Province. Magnesium oxide can be used as desulfurizer in power plant desulfurization system.
3. High desulfurization efficiency
Magnesium oxide is much more active than calcium-based desulfurizer in chemical reaction, and its molecular weight is smaller than that of calcium carbonate and calcium oxide. The desulfurization efficiency of light burnt magnesia powder is higher than that of calcium method under the same other conditions. Generally, 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 costs
Magnesium oxide as desulfurization has its own unique advantages, so the structure design of absorption tower, the size of circulating slurry, the overall scale of the system and the power of the equipment can be relatively 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 determining the operation cost of desulfurization system are the consumption cost of desulfurizer and water, electricity and steam. The price of magnesium oxide is higher than that of calcium oxide, but the consumption of removing the same SO2 magnesium oxide is 40% of calcium carbonate. The liquid-gas ratio is a very important factor in power consumption, such as water, electricity and steam, which directly affects the desulfurization efficiency of the whole system and the operation cost of the system. For the limestone gypsum system, the liquid-gas ratio is generally above 15L/m3, while the magnesium oxide is below 5L/m3, so the 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 cost.
6. Reliable operation
Thegreatest advantage of magnesium desulfurization over calcium desulfurization is that the system will not cause fouling and blockage of equipment, and can ensure the safe and effective operation of the whole desulfurization system. At the same time, the PH value of magnesium desulfurization is controlled between 6.0 and 6.5. Under this condition, the corrosion problem of equipment has also been solved to a certain extent. Generally speaking, the safety performance of magnesium desulfurization in practical projects has a very strong guarantee.
7. High Comprehensive Benefit
Because the reaction products of magnesium desulfurization are magnesium sulfite and magnesium sulfate, the comprehensive utilization value is very high. On the one hand, all magnesium sulfate can be produced by forced oxidation, and then concentrated and purified to produce magnesium sulfate heptahydrate for sale. On the other hand, sulfur dioxide gas with high purity can be directly calcined to produce sulfuric acid.
8. Broad prospects for the utilization of by-products
We know that sulfuric acid is known as the "mother of the chemical industry", and sulfur dioxide is the raw material for the production of sulfuric acid. China is a country with relatively scarce sulphur resources. The annual import of sulphur exceeds 5 million tons, equivalent to 7.5 million tons of sulphur dioxide. In addition, magnesium sulfate is widely used in food, chemical industry, medicine, agriculture and many other fields, and the market demand is also relatively large. Magnesium desulfurization makes full use of existing resources and promotes the development of circular economy.
9. No secondary pollution
In the common wet desulfurization process, secondary pollution inevitably exists. For magnesium oxide desulfurization technology, the follow-up treatment is more perfect, SO2 is regenerated to solve the problem of secondary pollution.
The reaction mechanism of magnesium oxide desulfurization is similar to that of calcium oxide desulfurization. Both of them are alkaline oxides reacting with water to form hydroxides, and then reacting with sulfite solution formed by sulfur dioxide dissolving in water to neutralize acid and alkali. Magnesium sulfite and magnesium sulfate produced by magnesium oxide reaction are reused or converted into forced oxidation after recovery of SO2. Magnesium sulfate heptahydrate is prepared from sulfate. The main chemical reactions occurring during desulfurization are MgO+H2O=Mg(OH)2Mg(OH)2Mg(OH)2Mg(OH)2+SO2=MgSO3+MgSO3+H2O+SO2=Mg(HSO3)2MgSO3+1/2O2=MgSO3+MgSO3+1/1/2O2=MgSO4 magnesium oxide during the regeneration stage of MgSO4 magnesium oxide. The main reactions occurring during the regeneration stage of MgSO3_MgSO3_MgO+SO2 Mg Mg Mg MgO+SO2 MgSO4 MgO+SO3MgMgMgMgO+SO3MgMgMgMgMgMgMgO(HSO(HSO)2)2 MgO+H2OMgSO3+1/2O2_MgSO4 when the by-product is forcibly oxidized to MgSO4.7H2O for sale MgSO4+7H2O_MgSO4.7H2O