Passive coal ash content measurement device and method

Abstract

The invention provides a passive coal ash content measurement device. The passive coal ash content measurement device comprises a lead shielding cover arranged above coal to be measured; an antenna is arranged under the coal to be measured; the antenna is connected with a photoelectric converter by a low-noise detector; the photoelectric converter is connected with a signal processor by an amplifier; and the signal processor is connected with a terminal by a data transmission device. A measurement method comprises the measurement steps: the low-noise detector receives natural gamma rays sent by a radioactive source in the coal to be measured; a natural gamma ray signal received by the low-noise detector is transmitted to the photoelectric converter to be subjected to A / D conversion; the converted signal enters the amplifier to be subjected to energy grade analysis; the signal subjected to the energy grade analysis by the amplifier enters the data processor to be processed in a specific processing manner; and a result processed by the signal processor is sent to the terminal by the data transmission device to be displayed. The passive coal ash content measurement device has the characteristics of on-line safety and rapid measurement.

Description

technical field [0001] The invention belongs to the technical field of ash content measurement, and in particular relates to a passive coal ash content measurement device and a method thereof. Background technique [0002] Coal ash is the percentage weight of the remaining part after the coal is fully burned at a certain temperature. Ash content is closely related to the calorific value of coal, and is one of the main bases for coal quality assessment and sales pricing. Every 1% increase in ash content in coke will lead to a 2%-2.5% increase in the coke ratio during ironmaking, a 2.5%-3% decrease in blast furnace yield, and a 2.7%-2.9% increase in slag. Conventional burning ash measurement methods, due to the complicated process, the lag time of the results is long, which cannot meet the needs of monitoring at any time. Therefore, online rapid measurement of coal ash content is very necessary in production, so that the ash can be monitored at any time and the process can be...

AI Technical Summary

Problems solved by technology

However, the dual-energy γ-ray absorption method has poor safety of the radiation source. Once the radiation source is lost or leaked, it will cause great harm to the environment or people. Therefore, the radiation source must be strictly managed, and it needs to pay a large amount every year in the application. cost; and the dual-energy Г-ray absorption method is susceptible to coal seam thickness changes (flow changes), accumulation shape changes, and coal seam weight differences, which affect the accuracy of coal ash measurement

The advantages of the muffle furnace burning method are cheap price and high accuracy, but the measurement time is as long as several hours, the efficiency is low, and it is difficult to adapt to the modern production site

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