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Significant progress achieved in improving the thermal efficiency of boilers at Jilin Petrochemical Company. Author/Source: Petrochemical Express. Date: November 28, 2023. Clicks: 22. According to the production and operation data from Jilin Petrochemical’s power plant, the average thermal efficiency of the 4 boilers from January to November was 91.619%, an increase of 1.509% compared to the previous year; this improvement generated economic benefits worth 7.55 million yuan. The efforts to enhance boiler thermal efficiency have led to new breakthroughs, helping to create new advantages in ensuring supply while advancing the company’s transformation and high-quality development. “Profitability is the lifeblood of a enterprise, and the thermal efficiency of boilers is an important economic indicator for evaluating their operation. Since the beginning of this year, we have precisely controlled the operating conditions of the 4 boilers, thereby improving thermal efficiency and saving 8,315 tons of coal – another effective measure taken by the factory to achieve improved quality and efficiency. ”Liu Haoran, director of the production and operation room at the power plant, said happily. As the entity responsible for ensuring a stable supply of energy for the chemical processing units at Jilin Petrochemical, the Power Plant formulated a strategy specific to each boiler in order to effectively improve its thermal efficiency. At the beginning of the year, it developed detailed plans for improving the combustion efficiency of these boilers over the short, medium, and long terms. A system of responsibility assignment was put in place, with plant management members taking charge of specific boilers, and clear roles were defined. Guided by set targets, a weekly, monthly, and quarterly analysis mechanism was established to work towards improving the economic efficiency of the boilers. Focus on problem-solving and tackle specific research topics. “Reducing the heat loss from boiler exhaust gases and the losses due to incomplete combustion is key to improving the thermal efficiency of boilers. ”Wei Huanyu, the director of the boiler workshop, explained. Since the beginning of this year, the power plant has conducted a comprehensive inspection of the boiler system and carried out in-depth research on its technology. To address the issue of high air leakage in the tail flue of Boiler No. 7, the power plant established a special task force. Senior management, relevant departments, and technical experts from the boiler workshop conducted multiple evaluations, and measures such as using castable material to seal gaps in the pipes passing through walls, rewelding the tail flue, and replacing the leaking tubes in the preheater were taken. As a result, the thermal efficiency of the boiler increased by 1.65% compared to before, leading to safer and more economical operation of the boiler. Emphasize fine-tuning to stimulate the drive for efficiency. “Boiler No. 6 is the oldest boiler in the plant; using the existing coal types, it constantly faces the problem of insufficient burnout, which prevents it from operating at high loads. ”Wei Huanyu said. To this end, the power plant invited experts from the Electric Power Research Institute to the site to assist with the commissioning process. By adjusting the coal feeding and pulverization system, the fineness of the coal powder fed into the furnace was reduced from 32% to 21%; the speed of the primary air was lowered to 25 m/s, and the proportions of primary and secondary air were adjusted accordingly. This improved the combustion rate of the coal powder once it entered the furnace and reduced the flame length. At the same time, by increasing the amount of secondary air, complete combustion of the coal powder and maintaining an appropriate furnace temperature were ensured. As a result, the efficiency of Furnace No. 6 increased by 2.83%, the problem of high flue gas temperatures was resolved, and new possibilities were opened up for further fine-tuning. Emphasize stable operation to ensure load capacity. Keeping the boiler load within the most economical range is also one of the key factors in improving efficiency. The power plant conducted a thorough analysis of the factors affecting the stable operation of the boilers. By replacing the slag scraping machines in Boilers No. 1 and No. 2, as well as the slag cooler in Boiler No. 2, it successfully addressed the problems of high failure rates in the slag removal system and poor slag discharge, which restricted the boiler’s capacity to operate under load. As a result, the boiler’s load-carrying capacity increased by at least 10 tons per hour, further enhancing its ability to withstand risks. In light of the high humidity of coal entering the plant during the flood season, dry slag is mixed into the coal intended for use in the boiler, thereby reducing its humidity and minimizing the occurrence of coal clumping and blockages, thus laying a foundation for the stable operation of the boiler. “Next, our key challenges will focus on identifying air leaks in Boiler No. 2 and achieving precise control over the boiler’s blowdown rate. We will analyze the existing and potential problems of the system, develop strategies to address them, and overcome the factors that limit the boiler’s efficiency, striving to achieve new improvements. ”Liu Haoran said.