Project Introduction: Due to the current changes in the coal market, many boilers cannot guarantee the combustion of the designed coal type. Moreover, the actual coal burned is frequently changing over the long term. When the calorific value or volatile matter content is too low, it can lead to delayed ignition during combustion, unstable furnace flames, and in severe cases, extinguishment of the furnace fire. The deterioration of coal quality also increases the power plant's coal consumption and power generation rate, reduces the equipment availability rate, and significantly raises maintenance and renovation costs. When the calorific value or volatile matter content is too high, it can cause coking, affecting the safety of boiler operation. The quality of coal has a significant impact on the safe and economical operation of coal-fired power plants. To adapt to changing coal types and achieve optimal operation under variable coal combustion conditions, maintaining long-term economic operation of the unit, it is very necessary to optimize and renovate the entire boiler system. General technical renovations are often piecemeal, addressing only single devices or local issues without considering the overall system. The technical feature of this approach is to start from the overall perspective of the power station boiler, ensuring that all transformation technologies are matched in the most rational way. Technical renovation projects include: Experimental research on the impact of coal type changes on the economic performance of the entire plant; Transformation of the combustion system to enhance adaptability to different coal types; Design for reducing flue gas temperature; Technological transformation to reduce carbon content in fly ash; Upgrading and expansion of the induced draft fan; Combustor transformation; Renovation effects: Through experimental research on the impact of coal type changes on the economic performance of the entire plant, various factors affecting the power generation coal consumption of the unit are identified, and the most suitable economical coal quality indicators (heat value, volatile matter, etc.) and coal blending methods for this boiler under the current coal market are quantitatively determined; Through transformation of the combustion system to enhance adaptability to different coal types, the adaptability of the combustion system to coal can be significantly improved, and coking and ignition characteristics are enhanced; Through design for reducing flue gas temperature, the flue gas temperature can be significantly reduced. By reducing the carbon content in fly ash through design modifications, we can identify various influencing laws on boiler fly ash carbon content under different coal types, and then carry out targeted renovations to achieve the goal of reducing fly ash carbon content. For matching fans that are not reasonable, we can perform efficiency enhancement and capacity expansion renovations to optimize the match, improve efficiency, and safety. By keeping the fan foundation unchanged, not replacing the transmission group, or motor, only re-optimizing the design calculation of the fan blade profile, and replacing key components such as the fan impeller, we can achieve an increase in output (10-30%) and operating efficiency (4-10%). To solve the problem of coal powder ignition characteristics under different coal types, we have multiple new burner invention patents that can be targeted for burner renovations. The innovation and leading nature of this technology: The key energy-saving renovation technologies involved in this project are all based on a large amount of laboratory model simulation data. Based on a thorough understanding of the relevant technical energy-saving mechanisms and combined with unique technologies formed by the project leader's twenty years of experience in the transformation of large numbers of thermal power plant boilers, various energy-saving technologies have been applied. On May 21, 2008, Shanxi Provincial Science and Technology Department organized domestic experts to appraise the project of Xi'an Jiaotong University, 'Optimization of Combustion System under Diverse Coal Quality and Key Auxiliary Equipment Energy-Saving Technologies and Applications.' The appraisal evaluation was as follows: the overall level reached international advanced standards. Market and Benefit Analysis: There are nearly a thousand thermal power plants in China, with thousands of large-scale power station boilers in operation. Due to changes in coal types, or long-term operation leading to poor adaptability of the combustion system to coal types, system wear, flue gas leakage, burner damage, unstable combustion, furnace coking, insufficient output of the induced draft fan, low furnace oxygen content, insufficient output of the pulverizing system, wear of the powder discharger, etc., these issues can be solved by applying the energy-saving technology. This technology has a broad market and can create huge benefits for these large power plant boilers every year. The application of this technology at Shanxi Zhangze Power Plant has already created an economic benefit of 517.16 million yuan for the plant. Cooperation conditions require: providing a customized energy-saving technical transformation plan according to the specific situation of the power plant boiler.