Extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method on basis of single nozzle for hearth

Abstract

The invention discloses an extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method on the basis of a single nozzle for a hearth. The extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method is characterized in that signals inputted into an extinguishment preventing, deflagration preventing and combustion stabilizing automatic control device of the nozzle at least include black dragon zone length signals of combustion flame at an outlet of the nozzle of a combustor; the extinguishment preventing, deflagration preventing and combustion stabilizing automatic control device of the nozzle automatically adjusts operation according to the inputted signals; automatic adjustment operational logics inside the device include that values of the black dragon zone length of the combustion flame at the outlet of the nozzle of the combustor are given, and the black dragon zone length signals of the combustion flame at the outlet of the nozzle of the combustor and the given values participate in automatic control operation; and control instructions outputted by the extinguishment preventing, deflagration preventing and combustion stabilizing automatic control device of the nozzle at least include one of a circumferential air quantity adjusting instruction signal for the nozzle, a fuel quantity adjusting instruction of the single nozzle, a one-step air speed requirement signal and an oil feeding enabling / disenabling combustion stabilizing instruction for the nozzle. The extinguishment preventing, deflagration preventing and combustion stabilizing automatic control method has the advantages that the quantity of fuel coal of the nozzle of a boiler and the peripheral air quantity and the air distribution quantity of the combustion nozzle are automatically adjusted, extinguishment and deflagration of the boiler are prevented, fuel mixtures inside the hearth are combusted stably, and a combustion field of the boiler is stabilized.

Description

technical field [0001] The invention relates to a control method for a burner in a boiler furnace, in particular to an automatic control scheme for fire prevention, deflagration prevention and stable combustion of a burner in a boiler furnace. Background technique [0002] The actual operating conditions of the boiler often deviate from the design conditions, whether it is changes in the volatile content of the fuel mixture, initial temperature changes, fuel calorific value changes, changes in the concentration of the imported fuel mixture, changes in the activation energy of the fuel mixture, and changes in the air distribution volume of the burner. Furnace burner combustion conditions; the actual coal type used by the boiler often deviates from the design and check coal type. When the type of coal used changes, the internal combustion conditions of the furnace burner will also change; the change of coal type will easily lead to the combustion state of the boiler. The flame...

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Problems solved by technology

[0002]The actual operating condition of the boiler often deviates from the design condition, whether it is the change of the volatile content of the fuel mixture, the change of the initial temperature, the change of the calorific value of the fuel, 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 will cause the combustion condition of the furnace burner; Combustion conditions also change; changes in coal types can easily lead to changes in the combustion state of the boiler, and flameout is prone to occur under low load; the adjustment level of the operating personnel is different, and the results of analysis and judgment on the combustion status of the burner in the furnace are also different. Analysis and judgment results will lead to wrong adjustment direction, resulting in burner and furnace flameout; the current boiler combustion field changes greatly, and human intervention is required to adjust coal combustion, air distribution, and even oil injection to stabilize combustion

At present, there is no feasible adjustment and control method at home and abroad to realize the safety and stable combustion of the burner and furnace of the boiler furnace. The coal quality of the power station is stable, and the change of the boiler combustion state due to the change of the coal quality is not obvious, so the international development has not been carried out in this field. method of control

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