News of network of global electric machinery:

1 overview:

As the development of career of our country pyroelectricity, the timing issue that boiler gives coal measures tube-shaped part more and more get of each heat and power plant take seriously, the timing system that uses morer at present is slippery poor timing, its control means is more typical and reliable, but its are existing timing precision difference, limits is narrow, linear bad, specific power consumption is advanced defect, and the inadequacy that the characteristic as it happens of frequency control system overcame traditional timing system, have efficiency tall, without turn scope of poor loss, timing is wide, characteristic hard, precision is tall, have apply the brake the characteristic with convenient and agile, small specific power consumption, have the advantage that communicates inductive electric machinery already, have the timing property of dc machine again, have very distinct energy-saving effect.

Compare in view of above, the discharges to coal, furnace timing of the furnace of chain of double furnace platoon of 3 75T/H chose limited company of Nantong burgeoning pyroelectricity frequency conversion system, pass the intelligent interface with DCS at the same time, implement the automation of boiler combustion system.

2 craft requirement and system are overall structure

The combustion process regulating system of boiler of limited company of Nantong burgeoning pyroelectricity, the requirement falls in different bear condition, maintain advocate of steam pressure force constant, the fuel amount that enters the chamber of a stove or furnace through adjusting reachs empty tolerance, make the quantity of bad news steam of the vapour crop of boiler and turbine and photograph of heat addition quantity are balanced. And the rotate speed that gives coal chance through the change realizes the adjustment that the combustion that enters the chamber of a stove or furnace measures. Chose transducer for this, will adjust the electric current of alternating current of three-phase of coal electric machinery and frequency by transducer, in order to realize the control to coal engine rotate speed. The adjustment that at the same time furnace discharges speed and moving state is as bigger as relation giving coal, its speed adjusted reason to also choose transducer. Because every furnace has side of armour, second,2 furnace platoon reachs 2 electric machinery giving coal, every such furnace used 4 transducer in all. Control to save dish dish of face space, reduce terminal wiring, chose a kind of concentration to operate pilot to operate monitor. Come to what control 4 transducer at the same time move through it, control the locomotive rate of coal and furnace platoon electric machinery thereby, enhance pilot definition, and pilot is seasonable gender and accuracy, make sure economic ground runs boiler safety. In the meantime, this operation monitor still can be linked together with system of our company DCS receive, those who accept DCS 4 - what 20MA signal completes combustion system jointly is self-adjusting. Additional, this system still introduced small-sized can make up Cheng controller, when malfunctioning in order to assure the some electric machinery in the system, interlink other equipment, make stop or be in some condition.
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