Dry powder sprayer supplier
The factors that affect the amount of non-condensable gas are:
(1) The temperature of the vacuum furnace is higher, the higher the cracking degree of the oil, the larger the amount of small molecular hydrocarbons generated by the cracking, and the same as the steam injection amount of the furnace tube and the same amount of the vacuum furnace. When the furnace outlet temperature was raised from 403.5 ° C to 410.5 ° C, the amount of cracked gas was added to about 6.0%. Therefore, efforts should be made to reduce the furnace temperature.
(2) Leakage of air The amount of air leaking in the operation of the existing device is basically a constant value, and its amount is small. Only the decompression system equipment and pipelines are in good sealing condition, and the amount of air leakage is small and basically unchanged, so the influence on the vacuum degree of the tower top is not significant.
(3) The temperature of the vacuum residue and its residence time at the bottom of the vacuum tower The residence time of the high-temperature vacuum residue at the bottom of the vacuum tower is too long, cracking may occur, and a small molecular weight cracking gas is generated and rises to the top of the tower. It becomes a non-condensable gas in the vacuum system, so it is necessary to prevent the temperature of the residue from being too high and the residence time is too long. The temperature of the residue is primarily determined by the furnace outlet temperature, but is also affected by the stripping steam temperature. The temperature of the stripping steam should not be higher than 420 ° C, otherwise it will promote the cracking of the residue. The residence time of the residue at the bottom of the column should be controlled within 1 minute to reduce cracking and coking.