A method for early warning of pulverized coal pipeline blockage in thermal power plants
A technology for pulverized coal pipelines and thermal power plants, which is applied in the direction of combustion methods, block/powder supply/distribution, and control of combustion. and other issues to avoid false alarms
Active Publication Date: 2019-02-05
NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST
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Problems solved by technology
The blockage of pulverized coal pipes will have adverse effects on boiler combustion and bring great difficulties to operation adjustment
At the same time, if the blockage of the pulverized coal pipeline is not found in time, the pulverized coal will spontaneously ignite after accumulating in the pipeline, burn the pipeline, cause a fire accident, damage the on-site equipment, and cause greater losses
[0004] At present, thermal power plants do not have a reliable pipe plugging monitoring method. Although some existing operating instruments can have corresponding feedback on pipe plugging, they are not strongly related to pulverized coal pipe blockage. At the same time, common normal operation adjustments of field equipment will also cause The changes and fluctuations of the indications, the operating personnel cannot distinguish between normal changes and abnormal changes, and cannot establish early warning indicators to identify accidents
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[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] The pulverized coal in the pulverized coal pipeline is carried by the primary air in the pulverized coal pipeline, sent to the burner and enters the furnace for combustion. Pulverized coal will naturally deposit in the pipeline due to gravity. When the primary wind carrying capacity is less than the deposited amount of pulverized coal, the pulverized coal pipeline will be blocked.
[0019] The carrying capacity of primary wind is mainly affected by wind...
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The invention belongs to the technical field of thermal power plants, and discloses a forewarning method for pulverized coal pipeline blockage of a thermal power plant. The method comprises the steps of obtaining the first coal mill systemic resistance, the first coal mill blast capacity and the first coal mill coal amount of a coal mill under a certain state in real time, and computing a first resistance characterization factor of the coal mill under the state while the first resistance characterization factor is in direct proportion to the first coal mill systemic resistance and in reverse proportion to the product of the first coal mill blast capacity and the first coal mill coal amount; obtaining a second resistance characterization factor of a coal mill pulverized coal pipeline under a normal state and a third resistance characterization factor of the coal mill pulverized coal pipeline under a blocked state; and determining whether the coal mill pulverized coal pipeline is blocked or not according to the first resistance characterization factor, the second resistance characterization factor and the third resistance characterization factor so that independent resistance characterization factor judgment indexes can be provided for each set of coal pulverizing system to prevent false alarm.
Description
technical field [0001] The invention relates to the technical field of thermal power plants, in particular to an early warning method for pulverized coal pipeline blockage in thermal power plants. Background technique [0002] The thermal power plant grinds the raw coal into coal powder through the coal mill, and transports the coal powder to the boiler furnace for combustion through the coal pulverized pipeline, and generates heat to heat the feed water to the steam of the design parameters. The steam enters the steam turbine, drives the steam turbine to rotate, and drives the generator to rotate. generate electricity. [0003] Pulverized coal pipeline blockage is one of the accidents prone to occur in thermal power plants. The blockage of pulverized coal pipes will have an adverse effect on the combustion of the boiler and bring great difficulties to the operation adjustment. At the same time, if the blockage of the pulverized coal pipeline is not found in time, the pulv...
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IPC IPC(8): F23N5/24F23K3/02
CPCF23K3/02F23N5/24F23N2239/02
Inventor 赵虞凌
Owner NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST