Thread Content
During the operation of the coke oven gas complexed iron desulfurization unit, due to the characteristics of the coke oven gas, impurities such as tar and dust are continuously carried into the desulfurization solution. In addition, the desulfurization solution contains a certain amount of suspended sulfur. These tar impurities and suspended sulfur deposit in areas at the bottom of the desulfurization system equipment where circulation is difficult. As these deposits accumulate, and when there are significant fluctuations in the flow rate of the solution or in the levels of the lean and rich liquid tanks, these deposited substances get disturbed and enter the circulating solution in large quantities. This leads to weaker foam formation during the regeneration process and an accelerated clogging of the packing in the desulfurization tower； At the same time, in the dead corners at the bottom of the desulfurization equipment, the accumulation of tar impurities and sulfur paste reduces solution flow and causes the temperature to drop to ambient levels, which easily leads to the crystallization of molecules with high specific gravity within the solution. Over time, this can result in blockages in the pipes and equipment. Therefore, regularly draining the sediment at the bottom of these devices, and removing the accumulated tar, sulfur sludge, and large-molecule substances into underground collection tanks, is very effective for ensuring the stable operation of the desulfurization system and for controlling the specific gravity of the solution. Key equipment in the coke oven gas desulfurization system, such as the liquid seal tank, solution circulation tank, lean liquid tank, rich liquid tank, regeneration tank, and regeneration tower, is equipped with drain valves. In actual operation, a large number of coking plants, for their own reasons, stop carrying out regular waste discharge procedures once the equipment’s waste discharge pipes become blocked and are not cleared for a long time, or once the waste discharge valves start leaking and are not replaced. A small number of coking plants are able to strictly follow regular waste discharge procedures, and this has indeed yielded very good results. To ensure continuous operability, this solution containing tar impurities, sulfur compounds, and large molecular substances is generally discharged into an underground collection tank, from where it is periodically pumped by underground pumps to a separate filter press for filtration. The impurities are removed as a filter cake, while the filtrate is reused in the system, enabling the system’s solution to undergo a continuous, efficient, and cyclic purification process.