Abstract: In China,pulverized coal industrial boiler has drawed lessons from the technical concepts of oil-gas boilers and German pulverized coal industrial boilers,which experiences project development,pilot test certificate and industrial demonstration.The system technology is gradually maturing.Since 2010,large-scale industrial application has been achieved.The coal-fired industrial boiler system has the advantages of high thermal efficiency and low emission of flue gas pollutants,which effectively promotes the development of coal-fired industrial boiler industry. In this paper,the technology and development of coal-fired industrial boiler were discussed,the key technologies of coal-fired industrial boiler were mainly introduced,the main technologies were compared,and the industrial application of coal-fired industrial boiler was analyzed,and finally the development direction of coal-fired industrial boiler technology was put forward.The results show that the technical system of pulverized coal industrial boiler consists of pulverized coal production,storage and supply,oil and gas ignition,combustion,boiler body,flue gas purification and automatic control system. The boiler thermal efficiency is more than 91 %,the flue gas pollutants meet the national ultra-low emission standard,and the system technology is more in line with the national coal clean utilization direction.The one-step process is adopted in the production of pulverized coal. The safe storage technology can achieve a storage capacity of 1 000 m~3 by strengthening the fluidity and safety protection measures of pulverized coal.The technology of pneumatic activation,pulse less feeding and high-speed jet dense phase conveying is adopted for feeding.The conveying resistance is less than 20 k Pa,the powder-air-solid ratio is more than 2.5 kg/m~3,the feeding accuracy is less than ±3.0 %,and the maximum feeding amount is 5 t/h.The dense phase feeding technology and equipment are widely used in the boiler feeding system.The feeding amount 2.5 t/h third-generation and fourth-generation feeders with feeding accuracy within ± 2.0% and ± 1.0% also carried out industrial verification and prototype trial production respectively,and achieved phased results.The pulverized coal burner adopts the reverse injection type reflux structure.According to its structural characteristics,the design work is carried out by simulating the air flow expansion angle,reflux area range,reflux flow,swirl intensity,temperature and velocity field,and then through practical engineering application,the design parameters are further verified and optimized,and finally the gradual amplification of the burner is realized.The natural gas/pulverized coal dual fuel burner has the functions of convenient switching and fast ignition.The air-cooled burner adopts internal and external two-stage swirl air supply combustion technology,which has the advantages of rapid ignition,stable combustion,high combustion efficiency and low initial NOxemission.With the development of pulverized coal boiler system technology,the boiler structure has gradually formed the related design and manufacturing specifications.Based on the continuous improvement of technology and equipment,the measurement and control technology is developing towards intelligence,networking and integration.Boiler flue gas desulphurization and dust removal adopts NGD high rate ash-calcium cycle desulphurization technology,which has the characteristics of small land occupation,low operating cost,and the system's desulphurization and dust removal efficiency can reach 90 % and 99.95 %,respectively,at a low molar ratio of calcium and sulfur.The low-temperature carbonbased pre-oxidation denitration coupled with NGD synergistic flue gas purification technology being developed is in the same direction as the synergistic purification of flue gas at home and abroad.The utility model has the advantages of simple process,less water consumption,reuse of waste resources,no secondary pollution,etc.,which is more suitable for flue gas purification of pulverized coal industrial boilers.The pulverized coal industrial boiler has been optimized and upgraded through key technologies and equipment in the development process,and has achieved results in the direction of large-scale,modularization and series.It has significant advantages over conventional industrial boilers in terms of energy saving,environmental protection and economy,and the technology has reached the world advanced level.In the future,with the optimization of the national energy structure,and the development and maturation of natural gas/pulverized coal boilers,low-nitrogen combustion,biomass composite semi-coke powder,and synergistic flue gas purification and other technologies,pulverized coal industrial boiler technology will become one of the main technologies for clean coal combustion.