| Saving energy and reducing energy consumption are a key node of sustained and stabledevelopment of cement industry. As a relatively mature and very effective technology, wasteheat power generation can adapt to China’s economic transformation and the realityrequirements. In order to improve the utilization of waste heat, we can do from two aspects:one is to try to get as much heat, reduce heat loss; two is to improve the thermal efficiency ofthe power system as far as possible, the waste heat convers into electricity as much aspossible. The issue mainly focuses on how to make in the cement production process does notincrease the burning heat consumption, not change the configuration of equipment and notaffect the normal production of clinker calcining process, to achieve the coordinated controlof calcination system and waste heat power generation system.The AQC furnace and SP furnace are respectively located in the rotary kiln of head andtail. The main heat source of the boiler are the waste gas which is from clinker cooling andmaterial’s preheating. Kiln calcining condition if the poor would heat air impact, and wasteheat power generation and excessive use of heat quantity for normal production, is notconducive to the normal cement production, therefore between the cement clinker productionand waste heat power generation interaction, mutual influence. AQC furnace in kiln head is animportant part of waste heat power generation system, the source of high temperature flue gasfrom grate cooler clinker cooling produced, and these high temperature flue gas and thefurnace combustion air, drying air and coal mill with air source heat, if the wind too much,certainly will influence of cement calcining, instead of waste heat with the wind too little willresult in the waste of heat.Based on the detailed analysis of mutual influence, cement clinker production and wasteheat power generation in this interaction, according to the important parameters of cementcalcination and kiln head AQC furnace, study on coordination control system, initiallyestablished a coordination control model of cement calcination and AQC furnace, in order toensure the quality and yield of cement at the same time, make full use of waste heat toincrease generating capacity, and to reduce cost, increase benefit. The cement calcination and kiln head AQC furnace process based on the requirements,through the comparison of the two air temperature, the scene in AQC furnace waste heat airtemperature and hot air valve opening and other important parameters analysis, the basiccontrol scheme of this paper: through adjustment of the residual hot air valve, to ensure thenormal use of wind two or three wind in the circumstances, to raise as much as possible intothe flue gas temperature of AQC boiler, achieving the purpose of power generation.According to data collected in the field and the field of skilled operator experience, make thetraditional PID control, fuzzy control and fuzzy PID control three scheme, and the solutionsfor a comprehensive comparison and analysis. Simulation results of MATLAB show that,fuzzy PID control is better than the traditional PID control and fuzzy control are compared,the steady-state error, the overshoot of system, adjust the time and other properties areimproved, and improve the system adaptability and stability. According to the simulationresults, fuzzy-PID controller as the cement calcination and kiln head AQC coordinatedcontroller.Research on ABB system based on AC800F, compiled by C#host interface, the corealgorithm and OPC communication interface program. The test results show that, the schemeto realize the coordinated control of cement calcination and AQC furnace, improves theutilization rate of waste heat of the flue gas, to ensure normal production of cement in casesgeneration purposes, and solve the existing cement production in multivariable, nonlinear,strong coupling problem, reduce the cost of enterprise and staff the intensity of labor, havesignificant effect on improving the efficiency of enterprises. |
PDF Full Text Request