In view of the frequent load fluctuations of chain boilers with a capacity of 10 tPh and below, a dynamic mathematical model of the steam-water system and combustion system of a 10 tPh chain boiler was established by using a modular modeling method, and simulation tests were carried out to obtain the real-time changes and trends of the boiler combustion rate, steam flow, superheated steam temperature and drum water level when the grate speed and air volume changed. The simulation test results show that the chain boiler should adopt the method of changing the grate speed and air volume at the same time to better achieve load adjustment, providing theoretical guidance for achieving stable and economic operation of the boiler. Keywords: chain boiler; dynamic model; simulation test Chain grate boiler is a layer-fired boiler with a relatively simple structure. Using coal-fired industrial chain furnaces for production and domestic heating is the main heating method in China. Therefore, the economic operation of chain boilers is crucial to energy saving, environmental improvement and whether enterprises can produce normally [1]. Since the main work of chain boilers in the operation process, such as coal addition, slag removal and ash discharge, has been mechanized, and the operation is stable and reliable, it has become the most widely used coal-fired power equipment in industrial enterprises, small thermal power stations and civil heating projects. In the industrial production process, the load fluctuation of chain boilers is very frequent. Taking effective measures to better achieve the stability of chain boiler load adjustment is an important guarantee for improving the economic operation of boilers. This paper can guide the actual operation of boilers through dynamic modeling and simulation experiments. According to the operation process and system characteristics of chain boilers, a dynamic mathematical model of 10 tPh chain boilers was established, and simulation experiments were carried out. The real-time changes and trends of boiler combustion rate, steam flow rate, superheated steam temperature and drum water level when the grate speed and air volume change separately and simultaneously are given respectively. The results show that changing the grate speed and air volume simultaneously can better achieve stable regulation of boiler load.
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