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New dry desulfurization agents developed by Southwest Chemical Industry have seen multiple industrial applications. Author/Source: Southwest Chemical Industry Research and Design Institute Co., Ltd. Date: June 23, 2020. Clicks: 40. Recently, news came in from the site of a desulfurization project for an 80WM gas boiler at a steel plant in Hebei; the new low-temperature, high-flow-rate desulfurization agents developed by Southwest Chemical Industry Research and Design Institute Co., Ltd. were successfully applied in this facility. The desulfurization efficiency, sulfur capacity, and emission parameters of these agents met the requirements for the operation of the plant, and even exceeded the specifications outlined in the contract. The desulfurization tower of an 80WM gas boiler at a steel plant in Hebei uses a fixed-bed process. The operating conditions are severe: large flue gas volumes, low flue gas temperatures, high design space velocities, high inlet concentrations, and uneven gas flow distribution. Since its commissioning in 2018, no desulfurizing agent that meets the required performance criteria has been found. The team working on the flue gas desulfurization project at Southwest Chemical Engineering developed a new type of high-velocity dry desulfurization agent tailored to the specific operating conditions of that facility. Side-line tests were conducted in an iron and steel plant in August 2019, and the desulfurization efficiency, sulfur capacity, and emission parameters of this agent met all the required standards. Supply was completed by the end of November 2019. Since the unit was put into operation, its actual operating space velocity has reached 1500 h-1, allowing it to operate stably under high-load conditions; this has successfully resolved the issues related to the engineering acceptance of the unit. In addition, the ultra-low temperature desulfurizer developed by Southwest Chemical has been operating stably and meeting the required standards for nearly 6 months in two dry desulfurization units for flue gas from coke ovens at Jiujiang Coking in Qian’an, Hebei (Qian’an Jiujiang Coal Storage and Transportation Co., Ltd.), with capacities of 230,000 Nm3/h and 210,000 Nm3/h respectively. The flue gas from dry quenching of coke has a low temperature (50–90°C), an unstable gas flow rate, and a high sulfur concentration (1–3 g/Nm3). The special conditions of this gas make its effective purification a persistent challenge for factories, posing serious obstacles to clean production in this industry. The flue gas desulfurization team at Southwest Chemical Engineering has developed a super-low temperature dry desulfurization agent tailored to the special conditions of flue gas, enabling high-precision desulfurization under such extreme low-temperature conditions. Currently, according to third-party test results, when the desulfurizer is not fully filled, the sulfur dioxide concentration at the flue gas outlet is less than 50 mg/Nm3 ； When it is filled, the outlet concentration can be kept below 15 mg/Nm3, with a desulfurization efficiency of over 99%. The multiple series of dry flue gas desulfurization agents independently developed by Southwest Chemical Research and Design Institute Co., Ltd. feature high desulfurization efficiency, high sulfur capacity, high space velocity, and a wide operating temperature range. Multiple invention patents have been filed for these agents, which have been applied in various industrial units; their performance has been highly recognized by clients, placing the company at the forefront of technology in this field. The company is also able to provide customized solutions for clients based on different flue gas conditions.