| Shuttle kiln is one of the main thermal equipment in the process of ceramic firing.The quality of the fired ceramic is mainly determined by the temperature and atmosphere in the kiln.The traditional shuttle kiln mainly relies on the manual experience or other simple thermal equipment for adjustment,which has the disadvantages of large labor intensity,large temperature difference in the kiln,unstable firing of products,etc.Compared with traditional shuttle kilns,automatic control shuttle kilns have the advantages of reducing the temperature difference in the kiln,enhancing the efficiency of ceramic enterprises,improving the working conditions and the quality of products,which has become one of the main development directions of shuttle kilns.This paper adopts numerical simulation to conduct comparative analysis and research on two kinds of traditional shuttle kiln(self-suction shuttle kiln)and automatic control shuttle kiln(dynamic shuttle kiln),as well as the design and research of intelligent control system for ceramic shuttle kiln using PLC.The main contents include:(1)By establishing a shuttle kiln model with the same volume of 2m3,a comparative study was conducted on the numerical simulation between the traditional shuttle kiln and the fully automatic controlled shuttle kiln in the high temperature section,a conclusion was drawn: The temperature uniformity of temperature field and the gas disturbance in automatic control shuttle kiln is better than that in traditional shuttle kiln,which greatly enhances the heat transfer of high temperature flue gas to the ceramic body in the kiln.The dynamic shuttle kiln can form a rotating circulation airflow in the kiln.The velocity of dynamic shuttle kiln is larger than the self-suction shuttle kiln.The gas disturbance in the kiln is stronger,which enhances the heat transfer efficiency in the firing process and is more conducive to the firing of ceramic products.(2)The shuttle kiln in a factory was taken as the research object,according to the structural characteristics of shuttle kiln and the firing curve of boron board,the PLC of Ke Wei LP2-28M20 R was used to control the temperature,atmosphere and pressure of shuttle kiln,and the PLC control program of shuttle kiln was programmed.The hardware including PLC and corresponding modules were selected,and the input/output address was configured.The Kunlun TPC was used to realize real-time monitoring of shuttle kiln control site.When controlling the temperature in the kiln,the new control method of dual actuators is adopted to control the ratio of gas and air,and the temperature is divided into 15 sections for temperature increase and decrease,achieving good results: In the low temperature section(40-720?)of the fired boron board,there is a certain temperature difference between the measured temperature and the set temperature in the kiln,but the measured heating rate is consistent with the set heating rate trend.In the firing section(720-1080?),the deviation between the temperature set value and the actual measurement value in the kiln is about 2?.In the high fire insulation section(1320-1340?),the deviation between the temperature set value and the actual measured value in the kiln is about 4?.In the cooling section(1340-300?),the actual cooling rate is relatively close to the set cooling rate.In general,the actual temperature firing curve of boron board is relatively close to the set temperature firing curve,and the atmosphere change of each temperature interval set by boron board is consistent with the actual measured atmosphere change of the corresponding temperature interval,which meets the firing control requirements of boron board ceramic products in shuttle kiln. |
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