高炉上料变频调速系统设计.doc

Intelligent Control Strategy for Combustion System of Industrial Boiler Abstract—In order to achieve energy saving and environmental protection requirements, indicators of industrial boiler must be controlled within an appropriate range. For a winery 35T / H boilers, after the establishment of mathematical model and solving, the implementation method is designed and then PLC is used to realize the intelligent control of system. After field application, the system achieves the design purpose, realizes perfect function and obvious energy-saving effect, but also to reach environmental requirements. Keywords-industrial boiler; combustion system; control strategy I. INTRODUCTION The working state of Industrial boiler combustion system is closely related to its air supply system, induced ventilation system, grate system and drum water level and others. Proper regulation, control of these associated systems is to solve that the boiler operating efficiency is low and an effective means of environmental pollution is serious. At present, to improve the operating efficiency of industrial boilers has become the technology of existing coal-fired industrial boilers pressing issues to be resolved, with far-reaching significance. II. A BOILER COMBUSTION PROCESS Industrial boilers is a multi-input, multiple-output, nonlinear and strong coupling of dynamic objects, the boilers combustion process is a strong interference, nonlinear, time-varying, multi-variable and complex process. Boiler operation will show the following two states: When the boiler is running at high load, due to large load, amount of coal grate and air supply is also great, high temperature furnace, the burning intensity. A lower excess air ratio can effectively reduce the flue gas temperature , raise the temperature of the furnace and convection tubes and be conducive to the continuation of tiny particles of carbon combustion, thereby reducing the smoke damage and mechanical loss of incomplete combustion. When the