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针对频繁发生的饮食业烟道火灾事故,在烟道火灾发火机理及烟道沉积物燃烧特性试验研究的基础上,提出了适合于烟道环境的火灾探测系统设计方案。该系统设计方案采用单片机AT89C51为核心控制芯片,选用热电偶温度传感器为信息采集单元,以集冷端补偿电路、信号放大电路和模数转换电路为一体的具有测温精度高、可靠性高及稳定性好等优点的MAX6675芯片为信号处理模块,以及报警和液晶显示模块。烟道火灾发生时,温度传感器采集信号后经信号处理芯片送控制系统,通过液晶显示并与系统设定报警阈值对比,判断是否发出报警信号。
Aiming at the frequent flue gas fire accidents in the catering industry, based on the experimental research on the flue gas fire mechanism and the combustion characteristics of the flue sediments, a fire detection system design scheme suitable for the flue environment was proposed. The design of the system uses single-chip AT89C51 as the core control chip, the selection of thermocouple temperature sensor for the information acquisition unit to set the cold-side compensation circuit, signal amplification circuit and analog-digital conversion circuit as a whole with high precision temperature measurement, high reliability and Good stability and other advantages of the MAX6675 chip for signal processing modules, and alarm and LCD module. Flue fire occurs, the temperature sensor signals collected by the signal processing chip to the control system, through the LCD display and compared with the system to set the alarm threshold to determine whether the alarm signal.