Reduce the ammonia nitrogen content by controlling the furnace temperature of the thermal reaction furnace in the desulfurization unit

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As of August 30, after nearly 4 months of continuous testing, the ammonia nitrogen content in the water at the bottom of the quench tower in Jinling Petrochemical’s alkylbenzene plant has remained below the **latest emission limits for four consecutive months. The plant’s desulfurization unit has been equipped with a new function for ammonia removal, achieving the goal of both desulfurization and ammonia elimination – thus delivering a two-fold benefit. News reports indicate that a factory has reduced ammonia nitrogen levels by controlling the temperature of the thermal reaction furnace in its desulfurization equipment; this is shared here for everyone’s reference, as well as to discuss its feasibility. –－－－－－－－－－－－－－－－－－－－－－－－－－ To effectively reduce emissions of nitrogen oxides and nitrogen hydrides, this factory takes action at every detail level to help achieve lower emissions. Since early 2016, the factory has been conducting inspections and verifications in accordance with the new version of the \"Emission Standards for Pollutants in the Petroleum Refining Industry (GB31570—2015)\", which came into full effect on July 1, 2017, and has accelerated the installation, renovation, and technological upgrading of environmental protection facilities. “The “desulfurization and ammonia removal” project is one of the technical improvement initiatives undertaken by the factory to meet new environmental standards. During the maintenance and renovation of the desulfurization unit in April 2017, two additional thermometers were installed in the thermal reaction furnace F-901. These new thermometers enable more accurate monitoring of the temperature inside furnace F-901, providing a basis for controlling the ammonia combustion process. At the same time, a process route for introducing aminoacid-containing gas into the furnace was designed without altering the desulfurization process flow. The ammonia in the desulfurization unit mainly comes from the wastewater stripping tower. The ammonia combustion experiment involves introducing the aminoacid-containing gas from the top of the wastewater stripping tower into the thermal reactor F-901, where the temperature in the furnace of F-901 reaches the minimum temperature required for ammonia combustion. Through prolonged experiments, analysis of the ammonia nitrogen content in the water at the bottom of the quench tower showed that it was always below the required level of 200 mg/l. In August, with the processing volume at the factory remaining unchanged, the ammonia nitrogen level stayed below 30 mg/l for nearly a month, and the ammonia burning experiment yielded good results. The ammonia burning experiment had no negative impact on the original process of the desulfurization unit; based on the current operating conditions of the ammonia burning project, the factory’s desulfurization unit will continue to use this method for ammonia burning. The effective operation of the ammonia removal system further reduced the burden on downstream wastewater treatment facilities, ensuring that the ammonia nitrogen levels in the wastewater met the latest emission limits. (Yuan Hongqiao, Cheng Zhongxing) ———————– – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – Welcome everyone to participate in the activities in the leisure area ==================== http://bbs.hcbbs.com/thread-1839820-1-1.html (Source: Haichuan Chemical Industry Forum Website)