This project belongs to the technical field of thermal power generation engineering and air pollution prevention and control engineering. my country's coal-fired power stations consume more than 60% of all coal. Coal burning emits large amounts of pollutants such as NOx, SO2, dust and heavy metal Hg, causing serious combined atmospheric pollution. This achievement carries out collaborative removal of multiple pollutants (NOx, dust, SO2 and heavy metals Hg, etc.) from the entire process of low-nitrogen combustion in coal-fired power station boilers-SCR denitrification-low and low-temperature dust removal-wet desulfurization-wet electrostatic dust removal-flue gas emission. Carry out technical research. After more than ten years of technical research and development, innovative results with independent intellectual property rights have been achieved, and key environmental protection technologies for coal-fired power stations have been formed that meet efficient denitrification, dust removal and desulfurization under wide-load denitrification conditions, and have been successfully applied to a large number of engineering practices. The main invention points and achievements achieved by the project are as follows: (1) A low-nitrogen combustion closed-loop control technology based on comprehensive optimization of economy and environmental protection has been developed. The boiler secondary damper control method, the economizer built-in flue gas volume diversion control method, the combustion stability judgment method, and the combustion and denitrification collaborative optimization method have been invented, and a new SCR catalyst with a wide operating temperature window and strong anti-poisoning ability has been developed., realizing boiler wide-load SCR denitrification and low-nitrogen combustion and denitrification collaborative optimization. (2) Developed design and operation optimization technologies for SCR denitrification devices. The reactor guide plate optimization method and the non-uniform ammonia injection optimization method have been invented to achieve accurate ammonia injection; the key state prediction method based on the boiler side real-time simulation model, and the intelligent soot blowing technology based on online estimation of the boiler side ash pollution coefficient and coal ash content have been invented., effectively improving the operation of the SCR system. (3) Developed efficient dust removal technology with multi-pollutant control functions. Invented an optimal design method for low and low temperature dust removal systems, realizing optimization of heat exchange tube selection, low-temperature corrosion prevention and flow field optimization; developed a high-flow rate and efficient wet electrostatic dust removal technology to achieve desulfurization and dust removal (including gypsum droplets) and collaborative control such as mercury removal further reduces the emission concentration of pollutants. (4) Developed efficiency enhancement technology for wet desulfurization systems. A flue gas desulfurization enhancer and a design method for a high-efficiency absorption tower were invented, and a pre-washing device, an annular flue gas distributor and a separation device with advanced performance were developed to realize multi-stage gas-phase flow-liquid phase redistribution enhanced mass transfer reactions and multi-effect additives in the tower. The synergistic effect of the additive solves the problems of uneven phase concentration distribution in a large space and competition between pollutant components. (5) Developed a full-process collaborative and efficient emission reduction technology for multiple pollutants. Successfully developed key technologies for power station environmental protection islands based on the efficient removal of various coal-fired flue gas pollutants, formed ultra-low emission environmental protection process routes and complete sets of equipment for coal-fired power station boilers, and built a number of national environmental protection upgrading projects and new unit application projects. Projects, successfully achieved efficient and multi-pollutant coordinated control, and actual emissions were better than ultra-low emission standards. Based on the above-mentioned technological inventions and developments, key technologies and complete sets of equipment for efficient environmental protection of power station boilers based on the coordinated control of full-process coal-fired flue gas pollutants have been formed. It has obtained 60 authorized patents (including 40 invention patents), authorized 20 software copyrights, and published more than 80 papers in domestic and foreign academic journals. The research results have been successfully applied to more than 240 coal-fired power plant environmental protection projects, including overseas projects such as Vietnam and Turkey, and achieved significant economic and social benefits. In the past three years, the new output value has been 2.56823 million yuan, the new profit has been 68.8246 million yuan, and the new tax revenue has been 288.2 million yuan. Through third-party testing and expert appraisal, the system's performance indicators are ahead of similar domestic units, and the overall level of project results has reached international advanced.