Device for energy-saving control of air and heat flows of a draft blower mechanism of an industrial boiler

摘要

FIELD: physics.SUBSTANCE: invention relates to process control of heat and air flows of industrial boiler unit. Device for energy-saving control of air and heat flows of forced-draft mechanism of industrial boiler includes controlled electric drive of blow-fan of boiler unit, which input is connected to microcomputer first output, on first input of which receives air pressure setting signal before boiler unit burner, consisting of serially connected digital-to-analogue converter, which output is connected to first input of adder device, second input of which is connected to outlet of temperature sensor of air supplied to boiler unit, third input is connected to fuel pressure sensor installed in main fuel line, and output is connected to first input of adder, the second input of which is connected to the air flow rate sensor output installed on the boiler unit inlet pipeline, the third input is connected to the oxygen content sensor in the exhaust gases, installed in the fume extractor control circuit, and the output is connected to the air supply regulator input, first output of which is connected to first input of summing device of electric drive of blower fan, and second output is to input of series-connected frequency converter, asynchronous motor and reduction gear, output shaft of which is connected to rotation frequency sensor, which output is connected to the first input of the summing device of the electric drive of supply of gaseous fuel to the boiler unit and kinematically through the reduction gear - to the fan shaft, providing an air injection mode into the boiler unit cavity, an adjustable electric drive of fuel supply to the boiler furnace, the input of which is connected to the second output of the microcomputer, to the second input of which receives the fuel flow rate setting signal, consisting of series-connected digital-to-analogue converter, the output of which is connected to the second input of the summing device, third input of which is connected to fuel flow sensor output, installed in main line of fuel supply main socket, and output is to input of series-connected fuel flow controller, frequency converter, asynchronous motor and a gearbox, which output shaft is kinematically connected to fan shaft, providing mode of fuel supply to nozzles of boiler unit, controlled electric drive fan blower, which input is connected to third output of microcomputer, on the third input of which receives the setting signal of the air rarefaction value in the boiler unit, consisting of the series-connected digital-to-analogue converter, the output of which is connected to the second input of the summing device, the third input of which is connected to the output of the flue gas flow sensor, and output is with first adder input, second input of which is connected to outlet of rarefaction sensor installed in lower part of boiler unit, and output is to inlet of in-series connected exhaust gas regulator, frequency converter, asynchronous motor and reduction gear, output shaft of which is kinematically connected to boiler gases rarefaction fan shaft, wherein microcomputer is configured to synchronize control of asynchronous electric drives to stabilize and optimize speed modes of controlled electrical complex of boiler unit.EFFECT: technical result of invention is to increase energy efficiency of using air and heat flows.1 cl, 1 dwg