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An on-line measurement device and measurement method for pulverized coal flow

A measuring device and pulverized coal technology, applied in mass flow measuring devices, indirect mass flow meters, etc., can solve the problems of heavy workload, large measurement error, low resolution, etc., to improve measurement accuracy, avoid pipeline powder accumulation, Optimizing the effect of boiler combustion

Active Publication Date: 2019-01-04
ANHUI XINLT POWER TECH CONSULTING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual sampling process, it is difficult to ensure constant velocity, which causes a large measurement error
At the same time, this method has a large workload and a long response time, and cannot achieve continuous online measurement
At present, the instrument that uses the capacitance method to measure the flow of pulverized coal does not take into account the measurement error caused by the uneven distribution and velocity of pulverized coal in the pipeline
Although electrical capacitance tomography can obtain information about the phase distribution of pulverized coal in the pipeline cross-section, the algorithm is complex, the resolution is low, and the measurement accuracy is not high due to inadaptability and soft field effects.

Method used

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  • An on-line measurement device and measurement method for pulverized coal flow
  • An on-line measurement device and measurement method for pulverized coal flow
  • An on-line measurement device and measurement method for pulverized coal flow

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Embodiment Construction

[0038] see figure 1 and figure 2 , the structure of the pulverized coal flow online measuring device in the present embodiment is:

[0039] A section of measuring tube 1 is set in series on the primary air duct. The measuring tube 1 is made of ceramic material, which can prevent the erosion and wear of coal powder. 2n electrode plates 2 are evenly distributed in a circular shape on the outer wall of the measuring tube 1, and the 2n electrode plates 2 form n rectangular plate capacitors facing each other in pairs; the capacitance of the plate capacitors is used as the output signal of the measuring device.

[0040] Such as figure 1 and figure 2 As shown, in the present embodiment, each shielding case 3 is independently arranged on the outer wall of the measuring tube 1, and the shielding case 3 is a metal mesh covering layer, and each electrode plate 2 is independently enclosed in the shielding case 3 at its respective position; two groups of capacitors The axial distance...

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Abstract

The invention discloses an on-line measurement device and method for pulverized coal flow, which is characterized in that: a section of measuring tube is arranged in series on the primary air duct, the measuring tube is made of ceramic material, and two sets of measuring tubes are respectively installed at both ends of the measuring tube Capacitive sensor; the capacitive sensor is a circular uniform distribution of 2n electrode plates on the outer wall of the measuring tube, and the 2n electrode plates form n plate capacitors in pairs; the capacitance of the plate capacitor is used as the output signal of the measuring device. The present invention adopts the multi-plate electric capacitance interval measurement, which effectively reduces the measurement error caused by the uneven spatial distribution of the pulverized coal concentration and velocity, and improves the measurement accuracy; the device of the present invention can be used for timely adjustment according to the online measurement data of the pulverized coal flow , so as to avoid problems such as pipeline dust accumulation, pulverized coal plugging and unbalanced distribution of pulverized coal, such as primary air duct burnout, overheating of the heating surface, slagging and thermal deviation, etc., and optimize boiler combustion.

Description

technical field [0001] The invention relates to an on-line measurement device and method for pulverized coal flow, more specifically to a device and method for on-line measurement of pulverized coal flow for coal-fired boilers. Background technique [0002] In the actual operation of coal-fired power plants, due to the difference in resistance of the four primary air pipes at the outlet of the coal mill, problems such as pipe blockage of pulverized coal and uneven distribution of pulverized coal often occur. The uneven flow distribution of pulverized coal sprayed into the furnace will directly affect the combustion of the boiler, resulting in the deflection of the flame center of the furnace, the obvious difference in heat load, causing local over-temperature coking of the water-cooled wall, and large thermal deviation between the left and right of the superheater and reheater. , Seriously affecting the safety and economy of boiler operation. [0003] The unbalanced distrib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/86
Inventor 丛星亮余永生陈剑谢红李勇陈鑫吴万范
Owner ANHUI XINLT POWER TECH CONSULTING
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