Pyrolytic graphite is a new type of carbon material, is the high pure hydrocarbon gas in the furnace pressure in pyrolytic carbon of 1800 DEG C to 2000 C high crystallinity graphite matrix on the chemical vapor deposited, it has a high density (2.20g/cm), and the content of impurities (heat, electricity and magnetism and the anisotropy of mechanical properties. The vacuum degree of 10mmHg can still be maintained at about 1800℃
The process of decomposition of matter. Many inorganic substances and organic matter are heated to a certain degree of decomposition reactions will occur. The pyrolysis process does not involve the reaction of the catalyst, as well as other energy, such as UV radiation.
High temperature strength increases with the temperature increasing, the strength reached the highest value at 2750 C 3600 C sublimation. low elastic modulus, high thermal conductivity, low thermal expansion coefficient, good thermal shock resistance. good chemical stability, acid, alkali, salt and organic reagent of molten metal, slag and other corrosive media have no effect, in the atmosphere at a temperature below 400 DEG C oxidation is not obvious, the oxidation rate increased significantly at 800 C. do not put any gas at high temperature, at 1800 degrees Celsius or so to maintain the vacuum of 10-7mmhg.
Heat transfer process requires a large amount of heat absorption process. The heating method can be divided into self heating process and external heating process. For example, limestone pyrolysis to produce lime, temperature above 800 degrees Celsius, or even in the presence of oxygen does not affect the reaction process, so you can use the direct calcination of the industrial furnace for heating process. For the cracking of petroleum fractions, the reaction temperature is over 750 DEG C, and the lowest possible hydrocarbon partial pressure, is the product of combustible gas, so commonly used partition heat transfer mode (such as pyrolysis tube furnace) or by the carrier (such as direct heating regenerative furnace pyrolysis, sand furnacecracking, high temperature water vapor cracking). External thermal process. But can also be used to burn some of the raw materials for the self heating process, such as natural gas or heavy oil combustion pyrolysis of acetylene, carbon black, etc..
