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Sampling-free detection method applied to microwave carbon examination and carried out at dust outlet of dry collector

A dry dust collector and detection method technology, applied in the direction of material analysis, instruments, and measuring devices using microwave means, to achieve the effects of easy layout, short crossing distance, and spacious site

Inactive Publication Date: 2015-12-02
解海龙
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Problems solved by technology

[0009] In order to overcome the defects of traditional sampling methods, the present invention proposes a new solution

Method used

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  • Sampling-free detection method applied to microwave carbon examination and carried out at dust outlet of dry collector

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] As shown in the figure: holes are opened on the opposite sides of the walls at the proper position at the outlet 3 of the dust hopper 1 of the dry dust collector, and a microwave transmitting device 4 is installed on one side, and a microwave receiving device 5 is installed on the other side; the two devices emit and The received microwave power signal is sent to the detection device control system 6 . During detection, the microwave emitted by the microwave transmitting device 4 passes through the fly ash 2 after dust removal and separation, part of it is absorbed by the carbon in the fly ash, and the rest is received by the microwave receiving device 5, and the microwave power signals of the two devices (4, 5) are passed through The microwave detection mathematical model embedded in the detection device control system 6 and related logical oper...

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Abstract

The invention relates to a sampling-free detection method applied to on-line monitoring of unburned carbon in fly ash of a large coal-fired boiler. According to the method, the operation is carried out on the dust outlet of a dry collector of a boiler unit, and the method is suitable for a detection device adopting a microwave method testing principle. The method is characterized in that monitoring points are moved to an outlet below a dust hopper of a primary dry collector through a flue. A pair of microwave transmitting and receiving devices is mounted on the opposite sides of a cross section of a dust outlet channel, so that microwave beams pass through the cross section of the dust outlet channel, while the flue dust which flows through the cross section and intercepted by the dust collector is taken as a tested object. With the adoption of the method, the problems of dust blockage, influences on the detection result by various factors, poor representativeness of a dust sample, and the like are solved; the arrangement, operation and maintenance of the detection device are convenient; and meanwhile, due to the improvement on the work environment, the reliability of the device is greatly improved, and the service life of the device is greatly prolonged.

Description

technical field [0001] The invention relates to a sampling-free detection method for on-line monitoring of carbon content in fly ash of a large coal-fired boiler. Microwave method" detection principle detection device. Background technique [0002] The carbon content of fly ash is an important indicator to reflect the economical operation of large coal-fired boilers, and it is also an indispensable basis for optimal combustion and low nitrogen oxide emission control. Therefore, the online detection of this indicator has become a hot spot of widespread concern. Among the existing detection methods, the "microwave method" has been widely used in engineering because of its advantages of fast test speed, simple structure, and small maintenance. At present, the detection samples of this method all come from the tail flue of the boiler. There are two sampling methods, but both have insurmountable defects, which seriously affect the popularization and application of this product. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/00
Inventor 王金铭解海龙
Owner 解海龙
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