How to thoroughly purge the low-pressure section of a gasoline and diesel hydrogenation unit to the distillation tower
Thread Content
How to thoroughly purge the low-pressure section to the fractionation tower in a diesel and gasoline hydrogenation unit. The plan is to use the remaining 5-6 kilograms of pressure from the low-pressure stream to push it into the distillation tower, followed by steam purging. Are there any other ways to purge in advance and speed up the shutdown process?
If it is necessary to purge the distillation column of the low-boiling residue from the diesel and gasoline hydrogenation unit, the following methods can be considered: 1. Use high-pressure nitrogen or steam for purging: Before shutting down the operation, high-pressure nitrogen or steam is introduced into the storage tank or container holding the low-boiling residue through pipes; this pushes the residue into the distillation column, from where it is then discharged through the outlet at the top of the column. 2. Use chemical cleaners: Some chemical cleaners can be used by pouring them into the storage tanks or containers for low-boiling residue, and leaving them there for a while to allow the cleaner to dissolve and carry away the low-boiling residues. It is then discharged through the outlet at the top of the fractionation tower. 3. Use mechanical cleaning equipment: Special purging devices such as cyclones or high-pressure water jet systems can be used, which are installed in the storage tanks or containers for light fractions residues. By means of strong rotation or high-pressure spraying, these residues are pushed into the distillation tower and then discharged through the outlet at the top of the tower. However, before carrying out the purging operation, it is essential to ensure that safety measures are thoroughly considered and implemented in order to avoid any accidents. .
This method works well: after scanning, nitrogen is introduced, and then pressure is released and oil is removed following the established process
It can also be purged in reverse. After oil compression, nitrogen is used for displacement, and during steam purging, it is considered to supply stripping steam from the stripper to purge the cold light ends.
Ultimately, it depends on the process setup in your company. In a process that involves high-pressure sections, low-pressure sections, and a stripping tower, there is usually a section where the flow is redirected or isolated between the low-pressure area and the stripping section; this can be achieved by closing certain valves to allow for separate purging of the stripping and distillation areas. Both the tower and the low-pressure sections should have dedicated purging steam systems. If the reaction system can be purged quickly enough, gas can be injected at the high-pressure section to push it toward the low-pressure section, thereby accelerating the purging process in that area.