Industrial Application of Oil and Coke Fines Removal Technology for Delayed Coking Sour Water

Authors: Jian Xiaowen, Liu Linbo (Shenzhen Sinokle Technology Co., Ltd.)

Document version: 202507  |  File type: PDF

Abstract

Existing technologies for removing oil and coke fines from coking sour water deliver unsatisfactory treatment results and readily cause coking and blockage in the downstream stripping unit. To address this, a new chemical-free pretreatment process for coking sour water is proposed. The process is built around a core combination of cyclonic dissolved air flotation and coalescence oil removal, supplemented by filtration for coke fines removal.

This paper analyses the technical principles of the combined process and verifies its performance through industrial application. The results show that during the non-steam-blowing stage of delayed coking, the combined process achieved an average oil removal efficiency of 98.83%; with an average inlet suspended solids concentration of 353 mg/L, the average outlet suspended solids concentration was 7 mg/L. During the steam-blowing stage of delayed coking, both oil removal efficiency and suspended solids removal improved to varying degrees.

These results demonstrate that the combined process performs excellently in removing oil and coke fines from delayed coking sour water, and provides a useful reference for the resource-oriented treatment of similar wastewaters.

Keywords: delayed coking; sour water; coke fines; cyclonic dissolved air flotation; coalescence oil removal