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This post was last edited by Steven_p0kTk on 2025-10-11 at 14:07. The desulfurization and purification of coke oven gas is a systematic aspect of technical management, and it represents an essential part of the coking production process. By carrying out necessary technical upgrades to adapt to changes in production requirements, it is possible to reduce the level of management effort and associated risks, while also helping companies meet the trends toward energy savings, consumption reduction, and carbon emission cuts. Currently, the desulfurization and purification of coke oven gas relies primarily on the traditional HPF desulfurization process, using cobalt-based desulfurization catalysts of the PDS type. The HPF method for desulfurizing coke oven gas boasts high stability and decent desulfurization efficiency. However, it still faces issues such as being constrained by the properties of the catalyst, requiring larger process equipment that leads to high investment costs; low working sulfur capacity resulting in excessive circulation volume of liquid in the desulfurization tower, and thus high operating costs. At the same time, as coking capacity increases and there is a tendency to use coal with higher sulfur content in production, the existing systems exhibit the drawback of insufficient flexibility. In such cases, to improve the operational stability of the desulfurization system, a capacity expansion and efficiency improvement upgrade of the wet oxidation desulfurization purification system for coke oven gas is a practical technical solution. (1) The desulfurization system is upgraded to use a high-sulfur-capacity desulfurization catalyst with excellent performance. A higher desulfurization capacity means not only a greater amount of hydrogen sulfide that can be removed with the same volume of desulfurization circulation fluid, but it also allows for a reduced volume of circulation fluid to achieve the same level of hydrogen sulfide removal. In actual production, when the production load increases or the hydrogen sulfide load in the gas rises, the use of desulfurization catalysts with a high sulfur tolerance helps to avoid overloading the system, thereby facilitating the stable operation of the desulfurization system and enabling adjustments to meet production demands. (2) Capacity expansion and absorption modification of desulfurization rich liquid. Under the operating conditions of catalysts with high sulfur capacity, the desulfurization rich liquid that has absorbed hydrogen sulfide, especially that from the secondary desulfurization process, still retains a remaining working sulfur capacity for absorbing hydrogen sulfide; it can therefore be used as a desulfurization liquid for the pre-desulfurization of gas ； It is also possible to use specialized reactors; especially when the hydrogen sulfide content in the gas is high, selecting such desulfurization-rich liquid for pre-desulfurization of the gas can reduce the desulfurization load on the conventional desulfurization towers used later on, thereby improving the purity of the gas after desulfurization. (3) Combined renovation of high-efficiency reactor + conventional desulfurization tower. The hydrogen sulfide content in the gas depends on the sulfur content of the coal used; when high-sulfur coal is utilized, the desulfurization system has to handle a greater load. Another factor is that as coking capacity increases and becomes more centralized, the amount of gas that each desulfurization tower must process grows larger. With conventional desulfurization catalysts, the size of these towers also increases, and an increase in tower size inevitably leads to higher requirements for mass transfer. In such cases, choosing a desulfurization reactor with a high liquid-to-gas ratio and efficient mass transfer as the primary desulfurization tower, and then incorporating a conventional packed-bed desulfurization tower or a flexible combination of various desulfurization and mass transfer devices, not only allows full utilization of the catalyst’s high sulfur capacity, thereby improving desulfurization efficiency, but also reduces the investment costs and operational energy expenses for enterprises. This approach is also suitable for technical upgrades and process optimizations of existing desulfurization systems as well as new ones.