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On December 10, Furnace No. 4 of the Inlite Chemicals by-product steam graphite synthesis furnace renovation project was successfully commissioned, further ensuring the safe and stable operation of the facility, effectively saving energy, reducing overall energy consumption, and improving economic efficiency. The secondary steam graphite synthesis furnace put into use this time is a modified and upgraded version of the company’s existing 4 two-in-one graphite synthesis furnaces. Before the renovation, the existing two-in-one graphite synthesis furnace generated as much as 440 kilojoules of heat per ton of hydrogen chloride produced, and this heat could not be utilized effectively, resulting in significant waste of thermal energy. At the same time, the heat exchange medium used in both the furnace roof and the jacket of the synthesis furnace is ordinary circulating water, which easily leads to scaling in the furnace chamber and the furnace roof coolers, shortens the operational life of the equipment, and results in frequent repairs at high costs. The furnace is ignited manually, and tasks such as maintaining the purity of hydrogen chloride gas and conducting analysis and monitoring before starting up the furnace are also carried out manually, which poses a high level of operational risk. After the renovation of the project, advanced technologies such as distributed control systems, online gas sample analysis, automated furnace ignition, and two-stage exhaust gas absorption are employed to upgrade the synthesis furnaces. These devices feature energy efficiency at level two or higher, and they offer advantages such as high production capacity and operational flexibility, excellent product quality, strong safety features, high thermal conductivity, high structural strength, and good temperature resistance, thereby ensuring that the entire production process is kept under strict control. In the high-temperature area, a pure water cooling process is used, which generates steam at a gauge pressure of 0.85 MPa; this steam is integrated into the plant’s steam distribution network, facilitating its distribution and use, thereby increasing thermal efficiency and improving the utilization rate of the heat generated during the hydrogen chloride reaction. The sight glass section and high-pressure transition section of the synthesis furnace are cooled by forced circulation of pure water, which reduces corrosion in the jacket filled with by-product steam and effectively prevents scaling in these sections due to poor quality of the circulating water. Once the complete renovation of the synthesis furnaces is completed, it is expected that carbon dioxide emissions will be reduced by 22,000 tons per year, and 7,283 tons of standard coal will be saved. The hydrogen chloride production capacity of each synthesis furnace will increase to 80 tons per day, with 72 tons of steam being produced as a by-product each day; moreover, the service life of the equipment will be extended by about 8 years. At the same time, the company regards the renovation project of the by-product steam synthesis furnaces as an important measure to promote safety and environmental protection, energy conservation and emission reduction, as well as sustainable development. It focuses on advancing the renovation of the remaining 3 by-product steam graphite synthesis furnaces, ensures timely implementation in accordance with the set deadlines, enhances a sense of responsibility and urgency, promptly identifies problems that arise during the renovation process, defines corrective actions, guarantees the quality of the renovations, and ensures that the furnaces can be put into operation on time and operate safely and stably.