Multipoint type detection apparatus for ash content of coal

Abstract

The invention provides a multipoint type detection apparatus for ash content of coal. The apparatus comprises a container, a detector, an electric control machine. The container comprises coal sample cabins, baffle plates and an automatic cinder valve (1). The detector comprises a gamma ray source device, a ray detector, a silicon drift detector (8) and a multichannel data analysis spectrometer (9). The electric control machine comprises a master control system (23), a power source (24) controlled by the master control system (23), a coal flow control system (25), a signal transmission system (26), a data processing and spectrum unfolding system (27) and a display system (27). By using the apparatus, multipoint continuous measurement of the ash content is realized. By pulling the baffle plates, the coal ash content is controlled to be measured in batches, and the coal samples measured by dual-energy gamma-ray are ensured to be in the same batch. Furthermore, the mutual interference between moderate-energy gamma-ray and low-energy gamma-ray is prevented, thus improving the representativeness and accuracy of the measurement.

Description

technical field [0001] The invention relates to a coal detection device, in particular to a multi-point coal ash detection device. Background technique [0002] Coal ash detection instruments include laboratory sample detectors and on-line detectors. The laboratory detectors that implement sample testing have accurate measurement results, but due to the lagging detection structure, they are separated from the automatic control of production. [0003] In various measurement and analysis, the use of gamma ray technology has been used as a routine technology, taking advantage of its strong penetration, gamma ray has been used for non-destructive testing of metals and ash in coal many years ago. In recent years, gamma-ray related nuclear measurement technology has been widely used, such as its application in cement, coal, ore and other fields. [0004] The traditional dual-energy gamma ray ash detector mainly has two types of structures: compound type and separated type. The s...

AI Technical Summary

Problems solved by technology

The structure of the composite dual-energy gamma-ray online ash detector is that the dual-energy gamma-ray radiation source is installed in the same shielded output device, and is detected and collected by a detector. Although this structure has the advantage of good identity, it is installed in the same The medium-energy gamma rays in the shielded exporter interfere with the measurement of low-energy gamma-rays, thereby affecting the accuracy of the measurement; the dual-energy gamma-ray radiation sources are respectively set in different shielded outputters, and two detectors are set correspondingly In terms of structure, it overcomes the interference of medium-energy gamma rays on low-energy gamma rays, but there is a technical problem of poor identity

[0005] Another main technical problem of the traditional dual-energy gamma ray in the ash detector is that the above-mentioned existing on-line ash detectors do not take into account the difference in the optimal measurement thickness of the low-energy gamma ray and the medium-energy gamma ray, because the two groups are different The penetrating ability of gamma rays with different energy levels is quite different, so that if the thickness of the coal sample satisfies the effective projection of low-energy gamma rays, the intensity of medium-energy gamma rays cannot change significantly before and after transmission, resulting in poor measurement accuracy. If the intensity of medium-energy gamma rays changes significantly before and after projection, the thickness of the coal sample must be increased, but in this way, low-energy gamma rays will be absorbed too much, and the detected Low-energy gamma rays are too low, and are too affected by the background and fluctuation effects, resulting in large measurement errors

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