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This post was last edited by Steven_p0kTk on 2023-12-13 09:02. For the wet desulfurization of coke oven gas, slot tray distributors, pyramid distributors, porous distributors, and similar types are commonly used as distributors for the solution flowing upward in the desulfurization tower. Especially in desulfurization towers that employ a low-tower injector regeneration process, the lean solution is pumped upward using a lean solution pump. Given the high pressure of the solution flowing upward, the use of slot tray distributors helps to reduce the impact on the tower caused by this flow. The large volume of solution that overflows from the slot trays falls vertically through the packing layer, resulting in strong scouring of the solution channels and reducing the likelihood of channel blockages. During the renovation of desulfurization towers, some coking plants replaced the tray-type distributors in the liquid inlet pipes with spiral-nozzle type distributors in order to improve the distribution of the liquid entering the tower and thus enhance the absorption efficiency of the tower. By introducing the liquid into the tower in a spray form, the liquid droplets are atomized, achieving a better distribution and consequently improving the desulfurization effect. In the case of the low-tower jet regeneration process, since the lean liquid is pumped for transportation, the impact force of the solution is greater; converting it to spiral nozzles often leads to some adverse effects in actual operation. 1. The concentrated erosion of the desulfurization tower wall leads to localized thinning of the carbon steel tower body. In the low-tower spraying process, the lean liquid is pumped under pressure by a lean liquid pump. As it passes through the spiral nozzles at the entrance to the tower, the spraying pressure of the solution is high; the flow velocity of the desulfurization liquid can reach 4 m/s. At the spiral nozzles near the inner wall of the desulfurization tower, a portion of the fluid is sprayed onto the tower wall, causing continuous erosion of that wall over time, which inevitably leads to localized corrosion of the tower structure. 2. The desulfurization liquid is in a misty form and rises with the air flow, causing blockage of the packing in the demisting section. The mist droplets emitted by the spiral nozzles are light in weight; when the gas velocity in the desulfurization tower is too high, these droplets continuously rise to the packing in the demisting section, increasing the separation load on that packing and leading to its rapid clogging. The above are the two adverse effects resulting from switching to spiral nozzles in place of tray distributors. Therefore, different processes require the selection of equipment and components based on actual conditions.