An automatic control method for fire protection and idealized combustion in a furnace

Abstract

The invention discloses an automatic control method for preventing extinguishment and realizing ideal combustion for a hearth. The automatic control method is implemented by the aid of a full hearth control unit, signals inputted into the full hearth control unit at least include center temperature signals of various flame layers, given load signals of a boiler and starting and stopping state signals of various nozzles or pulverizing systems, automatic control operation is carried out inside the full hearth control unit, and signals outputted after automatic control operation at least include one type of fuel quantity instructions or fuel quantity correcting instructions of the various layers, air distribution quantity instructions or air distribution quantity correcting instructions of the various layers, oil feed combustion stabilizing instructions and total heat exchange energy signals generated during combustion of the hearth. The automatic control method has the advantages that the fuel coal quantity of the boiler and air quantities of the combustion nozzles can be adjusted automatically, excessively high temperature of the inside of the hearth is prevented, the boiler keeps in a stable combustion state, the extinguishment condition is stopped, the automatic control method is safe and convenient, and accordingly purposes of preventing extinguishment and realizing ideal low-nitrogen combustion are achieved for the hearth.

Description

technical field [0001] The invention relates to a method for controlling safe combustion of a furnace hearth of a boiler, in particular to an automatic control method for fire prevention and idealized combustion of a furnace hearth of a boiler. Background technique [0002] When the coal combustion and air distribution of the furnace are artificially and automatically adjusted, a local high temperature condition inside the furnace is formed, resulting in an increase in NOx generated by combustion, forming a local high temperature and uneven air distribution and lack of oxygen, resulting in high temperature sulfur corrosion of the water wall; the actual operation of the boiler The working condition often deviates from the design working condition, whether it is the change of the volatile content of the fuel mixture, the change of the initial temperature, the change of the fuel calorific value, the change of the concentration of the imported fuel mixture, the change of the acti...

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Problems solved by technology

[0002] When the coal combustion and air distribution of the furnace are artificially and automatically adjusted, a local high temperature condition inside the furnace is formed, resulting in an increase in NOx generated by combustion, forming a local high temperature and uneven air distribution and lack of oxygen, resulting in high temperature sulfur corrosion of the water wall; the actual operation of the boiler The working condition often deviates from the design working condition, whether it is the change of the volatile content of the fuel mixture, the change of the initial temperature, the change of the fuel calorific value, the change of the concentration of the imported fuel mixture, the change of the activation energy of the fuel mixture, and the change of the air distribution volume of the burner, all of which will cause the furnace combustion. When the change of the type of coal used leads to the change of the combustion state of the boiler, the phenomenon of flameout is prone to occur under low load

[0003] At present, there is no feasible control method at home and abroad to realize the automatic control of boiler furnace fire prevention and idealized combustion. The coal quality is stable, and the change of the combustion state of the boiler due to the change of the coal quality is not obvious, so the international development of this field has not been carried out. At present, there is no method to realize the automatic control of furnace fire prevention and ideal combustion at home and abroad.

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