Sinokle’s New Tech: Revolutionize Electric Desalting Wastewater Treatment
1. Sources of Electric Desalination Wastewater
Crude oil contains certain types of salts, such as sodium chloride, magnesium chloride, and calcium chloride. As water evaporates, salt scales form on the tube walls of heat exchangers and heating furnaces, reducing heat transfer efficiency and increasing flow resistance. In severe cases, it can lead to pipeline blockage, tube wall burnout and even accidents. Moreover, metals in the salts will enter heavy distillate oil or residual oil, poisoning catalysts and affecting the quality of secondary processing feedstocks and final products.
Therefore, crude oil must undergo desalination treatment before entering the refinery, to reduce its salt content to less than 5 mg/L. For refineries with residual oil hydrogenation or heavy oil catalytic cracking processes, the salt content of crude oil is required to be less than 3 mg/L.
Electric desalting wastewater refers to the oil-containing and salt-containing wastewater discharged after crude oil is desalted and dehydrated in the electric desalting unit.
2. Generation of Electric Desalting Wastewater
To remove salt particles suspended in crude oil, a certain amount of fresh water (generally 5% of the crude oil volume) is injected into the crude oil, along with demulsifiers that help break the emulsification film in the emulsion.
After the crude oil is fully mixed with fresh water and demulsifiers, it enters the electric desalting unit. Under the action of an electric field, tiny water droplets coalesce into large ones and achieve oil-water separation under gravity. The separated water is then discharged out of the electric desalting unit.
The water quality of electric desalting wastewater is related to the properties of crude oil and the injection volume of fresh water. Generally, the oil content in such wastewater is about 200 mg/L, and the conductivity is about 2000 μS/cm.
3. New Technology for Electric Desalting Wastewater Treatment by Sinokle
Given that conventional methods cannot effectively remove components such as a large amount of dissolved oil, emulsified oil and small particle size waste oil in the wastewater, Sinokle has proposed a new treatment process based on its independently developed technologies to solve these problems.
CDFU (Cyclonic Dissolved Gas Flotation Unit): The cyclonic dissolved air flotation is a brand-new generation of green and high-efficiency vertical tank-type flotation equipment developed by our company.
Integrating cyclonic centrifugal separation technology, ultra-fine bubble generation technology and dissolved air flotation technology, the equipment realizes efficient and rapid separation of waste oil, emulsified oil, suspended solids and other substances in wastewater through the organic combination of multiple technologies.
It features an oil removal rate of >90% and an SS (suspended solids) removal rate of >85%. It adopts purely physical methods for demulsification, and is characterized by modularization, automation and informatization, capable of providing remote expert services. The equipment operates in a pressurized and closed manner, ensuring safety and environmental friendliness.
High-efficiency Coalescing Pressure Oil Separator: As a patented product of our company, it optimizes the internal space and structure of the tank body by utilizing the principles of coarse-graining and shallow tank, combined with CFD (Computational Fluid Dynamics) simulation tools. It rationally arranges the internal flow field to realize rapid agglomeration, coalescence, floating (or sinking) and separation of oil droplets or suspended solids in water.
The equipment has a compact structure and a small floor area, with a high oil removal efficiency of >90%. Its internal filler adopts a patented structural design, which can be made of optional stainless steel or reinforced PP (polypropylene) material, featuring high strength and long service life.
Equipped with a specially designed sand washing and sludge discharge device, it prevents filler clogging and equipment siltation. The fully enclosed, pressurized and automatic operation ensures stable, safe and reliable performance.
4. Application of Electric Desalting Wastewater Treatment Project
Project Treatment Data: Influent oil content ≤ 20000 ppm; Effluent oil content ≤ 500 ppm
