China's sulfur dioxide emissions have exceeded 20 million tons for many years in a row. The economic losses caused by acid rain have reached tens of billions of yuan each year. The amount of sulfur dioxide emissions from burning coal accounts for more than 90% of the total amount of sulfur dioxide emissions. It is understood that as of now, China's independent research and development of coal-fired desulfurization technology industrialization is not much, and both the introduction of technology or domestic technology, one-time investment is relatively large, only a small number of applications in large coal-fired projects.
The person in charge of Beijing Intercontinental Rongyuan told reporters that its environmentally friendly coal-saving sulfur removal and dust-reducing emulsion was developed from light hydrocarbons, sodium tetraborate, sodium nitrate, sodium chlorate, sodium peroxide, sodium dichromate, and sodium carbonate. When chemical reactions are combined, there is no "three wastes" in the production process, and the production cost is low.
The user report of this product shows that after adding environmentally friendly coal-removing sulfur and dust-reducing emulsion to the raw coal, the coal combustion temperature can be increased by 100°C to 250°C to allow the coal to be fully burned; the internal water and metal in the coal can be made available. Compounds and non-metal oxides also participate in combustion, reducing the total ash content by 30% to 40%. In addition, the product has significant effects in removing sulfur, dust, and descaling, which can reduce the emission of sulfur dioxide by more than 50%; reduce the smoke and dust emissions by more than 65%; long-term use can reduce boiler furnace fouling, thereby prolonging the service life of the boiler.
The product has obtained national patents and has formed a series of formulas, which are suitable for the use of different pot (kiln) furnaces in petrochemical, chemical, power, metallurgical and other industries. At present, there are about 400,000 Taiwan-type industrial boilers, 180,000 industrial furnaces, and 112 catalytic cracking units in China, and the power industry has 190 million kilowatts of thermal power installed capacity. According to reports, the investment required for the coal-fired desulphurization facilities required for the installed thermal power capacity per kilowatt is approximately 600 to 1,500 yuan, and the market for desulfurization is huge.
It is reported that at present, Beijing Intercontinental Rongyuan Company has established a production line with a daily output of 2 tons of emulsion.
Low-pressure casting was the earliest anti-gravity casting technology, which was first used in industrial production in the 1940s. Nowadays, low-pressure casting is mainly used in the production of aluminum alloy and magnesium alloy parts, such as the automotive hub of the automobile industry, the cylinder body, cylinder head, piston, missile shell, impeller, air guide wheel and other castings with complex shapes and high quality requirements.
The common material of low-pressure casting is A356\ZL101\ZL101A,this kind of material is usually applied to auto part, storage part,transformation part,etc.
The pressure on the surface of the molten metal is 0.06~0.12Mpa.This processing has good shrinkage, casting tissue is dense, easy to produce the large thin-walled complex parts, the casting head is not needed , metal yield can be up to 95%.
Low pressure casting can adopt sand type, metal type, graphite type, etc. The filling process is not only different from gravity casting such as metal casting and sand casting, but also different from high pressure and high speed filling pressure casting, which has the following advantages:
1) Pure metal liquid filling type, which improves the purity of the casting. Because the slag generally floats on the surface of the metal liquid, and the low pressure casting by the metal liquid in the lower part of the crucible realizes the filling through the lifting pipe, which completely avoids the possibility of the slag into the cast cavity.
2) The metal liquid filling type is smooth, reducing or avoiding the turnover, impact and splashing phenomenon of the metal liquid when filling the type, thus reducing the formation of less oxide slag.
3) The casting molding performance is good, the metal liquid filling under the pressure action, can improve the fluidity of the metal liquid, is conducive to the formation of clear outline, smooth surface casting, for the formation of large thin-wall casting is more favorable.
4) The casting crystallizes and solidifies under pressure, which can be fully condensed, and the casting structure is compact.
5) Improve the yield of metal liquid, generally do not need to burst, and the same metal in the lifting tube can be returned to the crucible, reuse, so that the yield of metal liquid greatly increased, the yield can generally reach 90%.
6) Convenient production and operation, good working conditions, high production efficiency, easy to achieve mechanization and automation.
Low pressure casting also has some disadvantages, equipment and mold investment is large; in the production of aluminum alloy casting, crucible and lift pipe long time with metal liquid contact, easy to erosion and scrap, will also make the metal liquid iron and performance deterioration.
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