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Sedimentation furnace coal powder ignition mode judgment method based on flame detector

A flame detector and settling furnace technology, which can be used in fuel oil testing, material inspection, weighing by removing certain components, etc., and can solve problems such as low heating speed

Inactive Publication Date: 2009-05-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The weakness of the thermobalance study is that the heating rate is much slower than the combustion of actual pulverized coal in the boiler

Method used

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  • Sedimentation furnace coal powder ignition mode judgment method based on flame detector
  • Sedimentation furnace coal powder ignition mode judgment method based on flame detector
  • Sedimentation furnace coal powder ignition mode judgment method based on flame detector

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Experimental program
Comparison scheme
Effect test

Embodiment

[0043] The working conditions of the coal combustion subsidence furnace are: the temperature of the ignition section is 850°C, the temperature of the burnout section is 1350°C, the powder feeding rate is 1.2kg / h, and the particles of the experimental coal type are less than 80 mesh. According to the structure of the settling furnace and the influence of the high temperature in the burnout section on the test results should be removed as much as possible, the data for calculating the characteristic parameters are obtained from the first nine observation windows. During the whole process, the flame detector probe is tightly fitted with the quartz observation window. The sampling frequency of the flame detector data acquisition card is 1000Hz, and the sampling time is 20 seconds for each quartz observation window.

[0044] from Figure 4 It can be seen that the flickering frequency of the single-coal pulverized-coal flame has three types of combustion curve shapes in the eigenva...

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PUM

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Abstract

The invention discloses a method which is used for judging a drop tube furnace coal dust flammation mode and based on a flame detector. The flame detector consists of a probe, a photod and a drive circuit thereof, a signal amplifying circuit, a signal filter circuit, a data collecting card and a computer. The flame detector is used for measuring time domain data at each axial observing window of a drop tube furnace flammation section and calculating three characteristic parameters including flame flicker frequency, fluctuation ratio and combustion dynamic energy respectively. The flammation mode is judged according to the fluctuation characteristic of a characteristic value connection curve of the characteristic parameters of each observing window at the flammation section, the obtained flammation modes are listed, and the flammation mode with most representation in a combustion coal characteristic parameter list is considered as the actual flammation mode of the current coal powder. The flammation mode judged by the method is closer to the actual combustion status of the coal powder in a boiler, and the method has very good guiding effect for optimizing and controlling boiler combustion.

Description

technical field [0001] The invention relates to coal combustion technology, in particular to a method for judging the ignition mode of pulverized coal in a settling furnace based on a flame detector. Background technique [0002] Coal properties have a significant impact on boiler design and operation. Only by correctly grasping the characteristics of combustion coal, selecting, designing and manufacturing boilers according to different characteristics, and formulating operating procedures, can better boiler performance be obtained. [0003] The combustion characteristics of power coal mainly refer to the ignition stability, burnout and slagging characteristics of coal, which play an important role in the safe and economical operation of boilers. The combustion characteristics of coal are evaluated according to the traditional volatile content, that is, the higher the volatile content, the better its ignition and burnout performance. This is acceptable to a certain extent, ...

Claims

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Application Information

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IPC IPC(8): G01N5/04G01N33/22
Inventor 张宏建迟天阳周洪亮阚睿
Owner ZHEJIANG UNIV