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脉冲喷吹控制仪 pulse blow controller

   脉冲喷吹控制仪是脉冲喷吹袋式除尘器清灰喷吹系统的控制装置。由它的输出信号控制电磁脉冲阀喷吹压缩空气,对滤袋循序进行清灰,实现袋式除尘器的阻力控制,保证除尘器的正常运行。
the pulse blow controller is the control equipment of cleaning blow system for pulse blow bag filter. the output signals of the controller control the electromagnetic pulse valve to blow pressure air, which removes the dust of the filter bag in sequence to control the resistance of the bag filter and to ensure the normal operation of the filter.
   袋式除尘器在运行中,滤袋迎尘面不断粘附尘粒,形成尘饼。使除尘器阻力(指其进、出口的压力差)上升。如不能及时而有效的清灰,捕集口引风压力下降,处理风量减少,影响整个系统的效果。一旦阻力不能控制而继续上升,除尘器将处于瘫痪状态。反之过度清灰,除尘器阻力过低,将会使颗粒物排放增加。因此恰当和有效的清灰是控制袋式除尘器阻力的关键。
the dust adheres to the side faced to dust of the filter bag, and forms the dust cake, therefore the resistance (pressure drop between input/output) of the filter increases. if the dust can’t be removed in time, the drawing air pressure of the collect input port will decrease, so the less processing air floe, the lower efficiency of the whole system. if the resistance can’t be controlled and increases continuously, the filter will cease working. otherwise the over cleaning will lower the filter resistance and the dust particulates exhaust will increase. therefore the proper and effective cleaning is the key to control the resistance of the bag filter.
脉冲喷吹控制仪有时序控制和压差控制二种:
there are two kinds of pulse blow controllers:
1)时序控制(也称定时控制)根据人为设定的时间、顺序控制电磁脉冲阀喷吹。
1) time order control (fixed time control): the sequence blow of the electromagnetic pulse valve is controlled by set time.
2)压差控制(也称定压差控制)根据袋式除尘器阻力变化来控制电磁脉冲阀喷吹。
2) pressure difference control (fixed pressure difference control): the blow of the electromagnetic pulse valve is controlled by the resistance change of the bag filter.
   时序控制属于开环控制较为简单,工作可靠,维护方便。根据运行经验设定或改变时间参数,调整喷吹周期。但喷吹参数不能随除尘器阻力的变化而改变。
the time order control (open-loop control) is more simple, reliable and convenient for maintenance. the time parameter is seted and changed, and the blow cycle is adjusted by the operation experience. but the blow parameter can’t be changed by the resistance change of the filter.
   压差控制属于闭环控制比较合理,根据除尘器阻力变化来控制电磁脉冲阀喷吹。但成本较高,维护工作量大。压差取样口一旦堵塞控制就会失效。压差控制适用于含尘气流变化较大,除尘器必须稳定运行的场合。
   the pressure difference control (closed-loop control) is more reasonable, because the blow of the pulse valve is controlled by the filter resistance change. but the maintenance cost is higher. if the sample port of the pressure difference control is suitable for bigger changes of dust air flow, to keep stationary operation of the filter.
   脉冲喷吹控制仪的术语和定义
   terminology and definition of pulse blow controller
1、脉冲宽度:控制仪输出每位电信号(符合受控电磁脉冲阀输入标准值)的持续时间。
pulse interval: the interval time between adjacent two output electric signals of the controller.
2、脉冲间隔:控制仪输出相邻两个电信号的间隔时间
pulse interval: the interval time between adjacent two output electric signal of the controller.
3、清灰:清除过滤介质上粘附的粉尘层。恢复过滤介质过滤能力的过程。
cleaning: the adhesion dust layer on the filtering medium is removed to recover the filter capacity of the filtering medium.
4、脉冲喷吹清灰:利用电磁脉冲阀在瞬间释放压缩气体,产生冲击振动和反向气流使滤袋急剧膨胀而剥离粉尘的方法。
pulse blow cleaning: the pressure air released instantly by the pulse valve produces a shock vibrant reversal flow, which expands the filter bag fast to remove the dust.
5、清灰宽度:袋式除尘器的单个电磁脉冲阀每一次的喷吹时间。由控制仪设定并控制。
cleaning duration: each continual blow time of a single pulse valve, seted and controlled by the controller.
6、清灰间隔:袋式除尘器二个相邻的电磁脉冲阀喷吹的间隔时间。由控制仪设定并控制。
cleaning interval: the blow interval tome between two adjacent pulse valves, seted and controlled by the controlled by the controller.
7、清灰持续时间:袋式除尘器每次清灰,从开始清灰到停止清灰所需的时间。
cleaning continual time: each cleaning time of a bag filter from beginning to the end.
8、清灰等待时间:袋式除尘器的清灰装置完成该次清灰后,因压差或时间原因不需要继续清灰的时间。
cleaning waiting time: during when the bag filter doesn’t need to keep on cleaning due to pressure drop or time parameter set after finishing one clean.
9、清灰周期:整个袋式除尘器相邻二次清灰的间隔时间。即包括清灰持续时间和清灰等待时间。
cleaning cycle: the interval time between two adjacent cleans of whole bag filter, which includes the cleaning time and the waiting time.

10、重复喷吹:控制仪输出电信号,使每位电磁脉冲阀喷吹二次或二次以上(包括二次之间的间隔时间)。
repeatedly blow time: during when the controller outputs the electric signals, which make every valve blow two times or above (including the interval time between two blows)
    脉冲喷吹控制仪早在上个世纪七十年代就开始应用于脉冲喷吹袋式除尘器的清灰控制,但仅有定时控制且易受干扰、难以适应高温、粉尘和电磁干扰。由于电子技术和器件的发展和进步,从分立元件、逻辑集成电路、专用集成电路到单片机。随着芯片集成度的提高,控制仪在同样功能的前提下所需的元器件大为减少,抗干扰性能不断提高。特别是单片机它包含着中央处理器(cpu)、输入/输出(i/o)接口、定时器、存储器,依靠软件的支持,功能大大扩展,可以具有定时、定压差控制,满足脉冲喷吹袋式除尘器在线或离线,单室或分室等清灰控制的要求。如采用可编程序控制器(plc)用袋式除尘器清灰控制,还可以方便地实现温度、料位、卸灰、输灰等控制,并实现各种故障的报警,完全可以在比较恶劣的环境条件下长期稳定、可靠的工作。大大提高袋式除尘器的装备水平。
the pulse blow controller was used in pulse bag filters early in 70th of last century, but equipped with only fixed time, controller makes it easier to be disturbed and difficult to resist high temperature, dust and electromagnetic interference, with the development of electronic technology from separated elements, logic integrated circuit, special ic to single-chip computer, the element volume reduces greatly with the same function of previous controllers. the resistant interference performance also continues improves with the increased integration. especially the single-chip computer contains the central process unit (cpu); input/output interface (i/o), timer, memory and software supports, the function expands significantly, such as set time, set pressure difference, on line or off line control. if the programmable logic controller (plc) is used to cleaning control of bag filters, it’s easy to achieve the control of temperature, material level, dust removing, dust transportation, and alarms for various faults. it more adverse circumstances. therefore the equipment quality can be improved significantly.

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