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The gasification workshop of Jinfeng Xifenghang successfully completed the dredging work of the sedimentation tank. Author/Source: Jinfeng Xifenghang. Date: 2022-05-12. Clicks: 12. Over the past few days, the circulating water system in this workshop has been in operation for an extended period, and coal sludge filled up 2/3 of the water level, posing a challenge to the stable operation of the system. The staff and workers in this workshop worked together; from applying for the necessary permits to removing the coal sludge from the sedimentation tank, the entire process took around 10 hours. It is reported that the sludge accumulated in the two sedimentation tanks of the gasification circulating water system mainly consists of coal ash from cyclone dust collectors, cooling water from the gas cleaning tower, and water added to the ash containers during ash removal from the gasification furnace. All of this material is used in a closed-loop system; failure to remove it in a timely manner can affect the cooling efficiency of the gas cleaning tower as well as the stable operation of the circulating water system. After prolonged filtration and sedimentation of wastewater, debris and coal dust accumulate increasingly at the bottom of the tank, and may solidify into a solid form, causing the bottom of the tank to rise. If this accumulation continues, it will affect the functionality of the sedimentation tank. Both sedimentation tanks to be excavated this time are of semi-basement structure. Based on on-site inspections and information provided by the contractor, the sedimentation tanks are 29 meters long, 3 meters wide, and 3.5 meters deep; they have a concrete structure, with their roofs covered entirely with VOCs-resistant tarpaulins. Preliminary calculations indicate that the amount of silt to be removed in this excavation is around 200 tons.