Large–scale modern waste incineration plants use the thermal energy generated by incineration of waste to generate electricity or heat. The main purpose is to treat waste. The amount of steam generated and the quality of steam depend on the incineration process. Generally speaking, using waste incineration thermal energy to generate electricity, the larger the processing scale, the better the economy. In terms of economic scale, the scale of the incineration plant should not be less than 300t/d. At present, the processing scale of the incineration plant has reached 3000t/d, and the single processing scale has reached 1000t/d.4.2.2 Steam parameters of waste heat boiler1. Basic analysis The main purpose of setting up a waste heat boiler is to prevent thermal pollution to the environment and effective heat energy recovery, and obtain certain economic benefits through incineration of a power generation system. In the research process of using large–scale waste incineration boilers to produce steam, attention has been paid to exploring ways to stabilize the combustion of waste and improve thermal efficiency. With the rapid development of automatic control technology and its application in waste incineration process control, the stable combustion of waste has been better solved. The main way to improve thermal efficiency is to reduce the heat loss of less heat utilization equipment and improve the steam parameters of waste heat boilers. With the development of traditional steel furnace technology and applied material technology, the research on reducing equipment heat loss has reached a high level. In theory, increasing the pressure and temperature parameters of steam at the same time is the basic method to improve thermal efficiency. The research and practical work in this area has been continuously deepened along with the development of incineration technology. When the waste heat energy was successfully used for power generation in the 1970s, the sub–medium pressure parameter (2.45MPa / 300°C) was often used at that time. By the mid to late 1990s, according to the research results, the steam parameter was increased to 4.0~4.2MPa / 400°C. During this period, the application research and practice of sub–high pressure parameters such as 5.0~6.5MPa were also carried out. What needs to be explained here is that there is a certain limit to the pursuit of high efficiency, otherwise high efficiency will cause more problems, which will result in a high price. Refer to Figure 4–12 for the practice of application research (the two figures are the statistical results of European and Japanese steel furnace experts). It can be seen from the figure that the use of high–pressure parameters above 10MPa is costly, and it is generally not used unless there are special requirements 6~8MPa sub–high pressure parameters are rarely used. In view of its economic problems, the application also has certain conditions. The main reason for adopting more low pressure parameters is garbage burn development early application results. Therefore, most of the current incineration plants use medium and medium voltage.