The following are specific application examples of fully welded plate heat exchangers in the petroleum industry, covering multiple stages such as crude oil processing, chemical by-product recovery, and key process units:
1. Applications in Key Process Units
* Crude Oil Preheating and Distillation
Before crude oil enters the distillation column, it needs to undergo an efficient preheating process. Fully welded plate heat exchangers are commonly used for crude oil desalting and preheating, utilizing their high heat exchange efficiency to quickly reduce the crude oil temperature and remove salts, preventing corrosion and coking in subsequent distillation columns.
* Chemical By-product Recovery
In ethylene cracking units, common recovery devices include hydrocarbon-rich ethylene separators and hydrocarbon-rich propylene separators. Fully welded plate heat exchangers are used for hydrocarbon-rich condensation and as reboilers in distillation columns, ensuring efficient separation of ethylene and propylene and improving recovery rates.
2. Atmospheric and Vacuum Distillation Unit Upgrade Case
* Corrosion Protection Upgrade
In Zhenhai Refining & Chemical's 10 million t/year refining unit, the original atmospheric and vacuum distillation U-tube heat exchangers experienced frequent leaks due to highly corrosive media. By replacing the heat exchanger with a fully welded plate heat exchanger, the corrosion leakage problem was successfully solved, and the equipment lifespan was significantly extended.
3. Energy and Waste Heat Recovery
Waste Heat Recovery
In petrochemical plants, waste heat recovery is achieved using fully welded plate heat exchangers. The waste heat from high-temperature exhaust gases is used to heat process media (such as oil or steam), achieving energy recycling and reducing energy consumption.
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