Automatic control method for preventing extinguishment and realizing ideal combustion for hearth

An automatic control device and anti-fire technology, which is applied in the field of automatic control of idealized combustion and fire prevention in the furnace, and can solve the problems of changes in the combustion state of the boiler and inconspicuous phenomena, etc.

Active Publication Date: 2013-04-17
刘建松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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.

Method used

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  • Automatic control method for preventing extinguishment and realizing ideal combustion for hearth
  • Automatic control method for preventing extinguishment and realizing ideal combustion for hearth
  • Automatic control method for preventing extinguishment and realizing ideal combustion for hearth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] Directly adjustable and precise full furnace control unit:

[0137] Such as figure 1 Shown: The signals input to the whole furnace control unit are: the temperature signal of the flame center of each layer or the temperature signal of the combustion center side of each layer of the furnace, the given load signal of the boiler, the given main steam pressure signal, each burner (pulverizing) System) start and stop status signals, the boiler fuel quantity command signal output by the boiler load regulation system, the whole furnace control unit first gives the boiler a given load signal, a given main steam pressure signal and the burner (pulverizing system) start and stop The status signal is calculated to calculate the given value of the flame center temperature of each nozzle layer:

[0138] ,

[0139] T nSV The value principle is: T of each layer nSV The value is close, 900℃nSV <1500℃

[0140] The calculated set value of flame center temperature of each nozzle layer and flam...

Embodiment 2

[0142] Directly regulated, accurate, steam temperature deviation correction, load deviation correction full furnace control unit:

[0143] Such as figure 2 Shown: The signals input to the whole furnace control unit are: flame center temperature signal of each layer or side temperature signal of the combustion center inside the furnace of each layer, boiler given load signal, steam temperature deviation signal, given main steam pressure signal, actual measurement The main steam pressure signal, the start and stop status signals of each burner (pulverizing system); the whole furnace control unit first gives the boiler load signal, the main steam pressure signal and the burner (pulverizing system) start and stop status The signal is calculated to calculate the given value of the flame center temperature of each nozzle layer:

[0144] ,

[0145] T nSV The value principle is: T of each layer nSV The value is close, 900℃nSV <1500℃

[0146] The calculated flame center temperature setting ...

Embodiment 3

[0148] Full furnace control unit in corrected form:

[0149] Such as image 3 Shown: The signals input to the whole furnace control unit are: the flame center temperature signal of each layer or the side temperature signal of the combustion center inside the furnace of each layer, the given load signal of the boiler, the start and stop status signals of each burner (pulverizing system) ; The whole furnace control unit first calculates the given load signal of the boiler, the given main steam pressure signal and the start and stop status signals of the burner (pulverizing system), and calculates the given value of the flame center temperature of each burner layer:

[0150] ,

[0151] T nSV The value principle is: T of each layer nSV The value is close, 900℃nSV <1500℃

[0152] The calculated flame center temperature setting value of each burner layer and other input signals are automatically controlled and operated. The automatic control unit outputs the fuel volume correction instruct...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N5/00
Inventor 刘建松
Owner 刘建松
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