循环流化床锅炉的各层燃烧器投切控制.PDF
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循环流化床锅炉的各层燃烧器投切控制
摘要:FSSS炉膛安全监控系统具有燃烧管理功能,它通过对锅炉的各层燃烧器进行投切控制,满足机组启停和增减负
荷的需要,对锅炉的运行参数和状态进行连续监视,并自动完成各种操作和保护动作,如紧急切断燃料供应和紧急停
炉,以防事故扩大.。在锅炉启动、运行、停止的各个阶段连续地监测锅炉的有关运行参数,根据锅炉防爆规程规定
的安全条件,不断的进行逻辑判断和运算,并经过逻辑判断、合理地发出动作指令,同时与有关主辅机信号合理地联
锁,以保证整个机组的安全、经济、稳定、可靠的运行。本文根据其工作原理对其系统保护作出一个针对性梳理。
关键词:FSSS、循环流化床锅炉、汽包水位、供油系统
Abstract: the furnace safety monitoring system has the FSSS burning management function, it through to the boiler of the layers of
burners were cut for control, meet the rev. Stop and increase or decrease load need, to the boiler running parameters and state
continuous monitoring, automatic and finish all kinds of operation and protection movement, such as emergency cut off fuel
supplies and emergency stop furnace, in case accident expand.. In the boiler start-up, operation, stop the stages of boiler
continuously monitored the relevant operation parameters, according to the provisions of the regulations boiler explosion-proof
safety conditions, constantly logic and operation, and after a reasonable logic, motion commands, at the same time and the relevant
auxiliary signal interlocking reasonably, to ensure the safety of the whole unit, economy, stable and reliable operation. In this paper,
according to the working principle of the system to protect a targeted comb.
Keywords: FSSS, circulating fluidized bed boiler drum water level, energy supply, system
FSSS系统通过不断的逻辑运算,当判断某一运行状态对设备或人身安全产生威胁时,系统自动发出报警信号或主燃料
跳闸信号(MFT),同时通过各种连锁和顺控功能,使相关设备按照预设程序执行相关操作和处理,以保证锅炉和设
备及人身安全,同时,提供首跳的相关信息,以便事故的查找和分析
FSSS构成图析
主燃料跳闸及首出原因显示MFT(Master Fuel Trip)
汽包水位高/低:
汽包水位高/低有三个独立的通道,采用三取二的逻辑,即设置三个独立的汽包水位变送器,变送器的模拟量信号在F
SSS装置种与设定值比较,形成数字量,经三取二逻辑运算形成汽包水位高/低的MFT触发条件。为了避免汽包水位瞬
间波动而产生汽包水位高/低触发MFT,通常在逻辑条件中加上延时条件,延时时间一般在5~20S左右。锅炉汽包满水
和缺水事故是火力发电厂的重大恶性事故之一。满水将使锅炉蒸汽严重带水,使蒸汽温度急剧下降,蒸汽管道发生水
冲击,甚至损害汽轮机机组。锅炉汽包缺水事故将不能维持锅炉的正常水循环,使蒸汽温度急剧上升,水冷壁过热,
轻者造成机组被迫停运,严重时可造成锅炉设备的严重损坏。锅炉汽包水位保护系统是防止锅炉满水和缺水的必要和
有效的措施,是锅炉启动及正常运行的必
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