Major breakthrough achieved in ZKE Yuandong’s YDS integrated desulfurization technology

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Major breakthrough achieved in Sinochem Far East YDS integrated desulfurization technology Author/Source: Sinochem News Network Date: July 25, 2019 Clicks: 14 On July 23, good news came from Ningbo Sinochem Far East Catalytic Engineering Technology Co., Ltd.: the two deep desulfurization projects built by this company for Xuecheng Energy Co., Ltd. of Shandong Weijiao Group have been fully completed and put into operation, with all process parameters meeting or exceeding the design standards. The project was carried out in two phases: Chemical Production Workshop 1 and Chemical Production Workshop 2, and both were successfully commissioned with batch feeding on June 19 and July 2 respectively. Currently, both sets of equipment are operating stably, with the hydrogen sulfide emission level at 3 mg/Nm3 – a very low value that is far below the design value of 20 mg/Nm3 – thus achieving the goal of ultra-low emissions. It is reported that Xuecheng Energy currently has coking production capacities based on 5.5-meter and 6.25-meter coke ovens. The two systems are independent of each other. To achieve energy conservation and emission reduction, meet better environmental emission standards, and ensure the stability of coke oven gas utilization in subsequent processes, it is necessary to carry out a thorough renovation of the existing desulfurization system. At the end of September 2018, Zhongke Yuandong and Xuecheng Energy signed an EPC general contract for the deep desulfurization project of coke oven gas. According to Xiang Wenyu, chairman of Zhongke Yuandong, the gas handling capacities of these two systems are 70,000 Nm3/h and 83,000 Nm3/h respectively. Based on the production site conditions, the gas treatment volume, hydrogen sulfide content, and relevant requirements, the design takes energy conservation and emission reduction into account. The project utilizes Zhongke Yuandong’s YDS integrated desulfurization technology along with traditional high-tower regeneration processes; the equipment features Zhongke Yuandong’s proprietary gas, liquid, and gas-liquid regeneration distributor technology. The features and advantages of these proprietary technologies are improved gas-liquid distribution, which effectively increases the gas-liquid contact area; they also reduce the tower diameter and the amount of packing required. The absorption efficiency is increased by more than 30% compared to traditional methods, the operating range for hydrogen sulfide at the inlet reaches 330%, and the overall energy consumption of the system can be reduced by more than 30% (in terms of electricity, steam, compressed air, and catalyst materials). After the modification of the system, the hydrogen sulfide content at the outlet is minimal, **which reduces the total sulfur content in the gas fed to the coke oven. This in turn lowers the load on the flue gas desulfurization system (the SO2 content before entering this system is less than 30 mg/Nm3). The sulfur content in the gas sent to subsequent processes is less than 3 mg/Nm3, **which reduces the consumption of desulfurization agents, extends their service life, enables stable operation over longer periods, and reduces maintenance costs. The economic and environmental benefits are thus more significant. 　　Due to the space constraints in Workshop 1 for chemical production, the YDS integrated desulfurization technology developed by Zhongke Yuandong was adopted for the in-depth desulfurization project in Workshop 1. “This technology not only requires low investment, but it also improves the gas-liquid distributor inside the desulfurization tower, allowing for better contact between the gas and the desulfurization liquid and thus further enhancing the desulfurization efficiency. Under the same equipment conditions, the improved desulfurization efficiency can be about 20% higher than that of traditional technologies. ”Xiang Wenyu said. 　　Xiang Wenyu told reporters that the system design of this project features automation and user-friendliness, with attention paid to detailed optimization. It enables unattended operation at the site and remote control, thereby reducing the labor costs associated with daily operations and decreasing the physical strain on workers. Workshop 1 for chemical production represents a breakthrough in the overall desulfurization process in the Far East, while Workshop 2 for chemical production marks a breakthrough in the integrated optimization of desulfurization components; the desulfurization efficiency has increased by at least 30%, with the hydrogen sulfide level at the outlet of traditional processes being at least 20 milligrams. 　　It is understood that in order to complete this project successfully in terms of both quality and quantity, Zhongke Yuandong attached great importance to it. Several senior managers from the company went to the project site to conduct inspections and provide guidance, and more than 10 professional technicians were assigned to the site to oversee the work, closely monitoring the process parameters and equipment performance. By working closely together with the project owner’s requirements, and through the joint efforts of the technical staff, the project owner, and all those involved in the project, the installation and commissioning were completed successfully, with the system starting up without any issues from the first attempt. 　　Xiang Wenyu said that the Zhongke Yuandong integrated technology combines traditional desulfurization towers, regeneration towers, circulation tanks, and liquid seal tanks into one unit. Regeneration air and spraying liquid require no energy consumption; the tower size is small, investment is reduced, and energy use is low. This technology can reduce hydrogen sulfide levels from 12,000 mg/Nm3 (or higher in other systems) to below 3 mg/Nm3 (trace levels), something that traditional processes are unable to achieve. From the start of construction to its complete completion and operation, the engineering technicians from Zhongke Yuandong overcame various challenges such as a short construction period, limited space for work, and difficulties associated with construction in the production area. They worked closely with the project owner to coordinate efforts, worked overtime to accelerate the construction progress, and completed the project with high standards, quality, and efficiency. This resolved the problem that the unstable levels of hydrogen sulfide had posed to production for the owner over time, laying a solid foundation for safe, environmentally sustainable, and stable operations of the enterprise.