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At 20:00 on April 12, the boiler supporting the 1.2 million tons per year ethylene plant was successfully ignited for heating, marking the entry of the new ethylene plant into the final preparation phase before operation. The boiler supporting the 1.2 million tons per year ethylene plant began construction on September 21, 2023, and was completed on November 30, 2024. A total of 422 pile foundations were installed, 6,995 cubic meters of concrete was poured, 1,800 tons of steel structures were installed, 120,000 inches of process pipelines were laid, 76 pieces of mechanical and electrical equipment were installed, and 423,441 meters of cables were routed. It includes two fuel-gas ultra-high pressure boilers with a rated evaporation capacity of 200 tons per hour, a main steam pressure of 12 MPaG, and a temperature of 530°C. The unit uses ethylene tar, produced as a by-product of the ethylene plant, as its main fuel, with natural gas serving as an auxiliary fuel, to supply steam for newly built ethylene plants and downstream associated facilities. The purpose of heating the furnace is to remove the free water and crystalline water in the refractory lining gradually and evenly, by allowing the water to evaporate slowly; this prevents the sudden massive evaporation of water from creating a vapor pressure that exceeds the bonding strength of the concrete binders, thereby avoiding damage to the furnace walls due to cracking. At the same time, it slowly releases the moisture contained in the refractory layer and insulation layer, allowing the cast material to cure fully and maintaining the strength and stability of the refractory layer, thereby preventing the refractory materials from cracking or even exploding during normal operation of the boiler. To ensure the smooth progress of the boiler drying process, technical personnel and the construction team developed a detailed commissioning plan based on the type, structure, and operational requirements of the boiler. This plan specified the heating rate at each stage, the temperature control ranges, and the operating procedures. A comprehensive inspection and maintenance were carried out on the boiler itself, its auxiliary equipment, and the piping system.