Thread Content
Sulfur, nitrogen oxides, and dust generated during the production process of coking enterprises are common pollutants that are also the focus of environmental protection regulations and monitoring. Moreover, increasingly stringent ultra-low emission standards for such enterprises are essential for their survival and development. In all stages of coking production, the quality of the gas desulfurization and purification process has a direct impact on the difficulty of treating sulfur dioxide in the flue gases emitted from the coke ovens, as well as on the level of sulfur content in these gases. It plays a significant role in achieving ultra-low emissions of sulfur in flue gases; therefore, it is particularly important to choose mature and reliable gas desulfurization and purification technologies. The GLT complexed iron desulfurization zero-waste technology is a new type of desulfurization and purification technique for coke oven gas, developed specifically based on existing coke oven gas desulfurization systems; it helps coking enterprises achieve ultra-low emissions in gas purification. (1) The complete set of technologies for zero-waste GLT complexed iron desulfurization is mature and stable. Relying on a highly efficient and stable composite complexed iron desulfurization catalyst, a full suite of proprietary technical processes and equipment suitable for coking plants has been developed, ensuring the stability of the desulfurization and purification process of coke oven gas. (2) By strengthening source control and implementing stable desulfurization of hydrogen sulfide at the early stage in the gas supply, the difficulty of treating sulfur dioxide in the flue gases from coke ovens has been greatly reduced. After adapting the existing gas desulfurization systems, the GLT complexed iron desulfurization technology without waste liquid generation is employed; the sulfur recovery rate from desulfurization can reach 98% or higher. Hydrogen sulfide in the gas is essentially converted into sulfur, with no need for treatment of desulfurization waste liquids. Meanwhile, the hydrogen sulfide content in the purified gas remains stable at 20 mg/Nm3 or below ； After combustion, the sulfur dioxide content in the waste gas from the chimney is lower and more stable, which greatly reduces the difficulty of subsequent flue gas desulfurization and denitrification processes. (3) The desulfurization catalyst with high sulfur capacity enables capacity expansion and efficiency improvement for existing desulfurization systems, fully meeting the technical and energy-saving upgrade requirements for ultra-low emissions in coking enterprises. The GLT complexed iron desulfurization catalyst specifically designed for the desulfurization and purification of coke oven gas can achieve a maximum working sulfur capacity of 0.6 kgS/m3 in solution, which is significantly higher than that of conventional desulfurization catalysts, whose working sulfur capacity is around 0.2 gS/m3 in solution. The upgraded use of desulfurization catalysts with high working sulfur capacity brings two advantages. First, it facilitates energy-saving upgrades in the desulfurization and purification of coking gas; a high working sulfur capacity means a lower demand for desulfurization circulation fluid as well as smaller equipment sizes, which is highly beneficial for controlling desulfurization costs in cases of larger coking production capacities ； Secondly, it has a strong ability to resist interference caused by fluctuations in the hydrogen sulfide concentration of the raw gas. Even when the hydrogen sulfide concentration in the gas increases significantly before desulfurization, the GLT complexed iron desulfurization method can still ensure that the hydrogen sulfide concentration in the purified gas remains below 20 mg/Nm3. This prevents any increase in the processing load and pressure on subsequent flue gas desulfurization and denitrification systems, allowing coking enterprises to meet the strict requirements for ultra-low emissions more easily.