Filter paper belt transmission device and method for improving [Beta]-ray detection accuracy of flue gas particulate matters

Abstract

The invention discloses a filter paper belt transmission device and method for improving [Beta]-ray detection accuracy of flue gas particulate matters. The filter paper belt transmission device for improving the [Beta]-ray detection accuracy of the flue gas particulate matters comprises a flue gas particulate matter [Beta]-ray online monitor; the flue gas particulate matter [Beta]-ray online monitor comprises a mounting plate; the mounting plate is provided with a sampling unit, a detecting unit, a filter paper belt, a filter paper belt transmission device, a paper collecting and releasing mechanism, and a paper pressing mechanism; the sampling unit includes a flow control module and a sampling pump; the detecting unit includes a [Beta]-ray radioactive source and a detector; and the filterpaper belt transmission device includes a straight line sliding table, an encoder counter, a guide wheel, a paper belt left transmission wheel, and a paper belt right transmission wheel. The invention ensures that the filter paper is continuously tightened and is not broken or damaged during the movement of the filter paper belt; therefore, the blank filter paper error during the measurement process is reduced. Since the automatic zero point calibration can be realized in each measurement cycle, the repeatability of the instrument measurement is ensured, and the [Beta]-ray detection accuracyof the flue gas particulate matters is improved.

Description

technical field [0001] The invention relates to a filter paper belt transmission device and method for improving the detection accuracy of β-rays of smoke particulate matter. Background technique [0002] With the wide application of technologies such as wet electrostatic precipitator and low-low temperature electrostatic precipitator in the ultra-low emission transformation of coal-fired power plants, iron and steel, coking and other industries, most of the smoke and dust concentrations at the discharge outlet have reached below 10mg / m3, which is very important for the detection accuracy of flue gas particles. put forward higher requirements. [0003] The flue gas particle concentration measurement method based on the scattered light method cannot fully meet the accuracy and authenticity requirements of ultra-low emission monitoring data, mainly reflected in the following two aspects: (1) Although the light scattering technology has high sensitivity, it can measure as low a...

AI Technical Summary

Problems solved by technology

[0003] The smoke particle concentration measurement method based on the scattered light method cannot fully meet the accuracy and authenticity requirements of the ultra-low emission monitoring data, which is mainly reflected in the following two aspects: (1) Although the light scattering technology has high sensitivity, it can measure as low as 0.1 mg / m3 dust concentration, but this technology is easily affected by water vapor, and is easily affected by various factors such as particle size, shape, color, composition, etc., and it is difficult to adapt to the conditions of low temperature and high humidity of flue gas generated by ultra-low emissions

(2) Whether it is the backscattering method or the forward scattering method based on the principle of scattering, the optical properties of the particles are measured, and then the mass concentration of the particles is obtained through algorithm inversion instead of directly measuring its mass concentration, so it cannot Complete the traceability of the mass concentration of particulate matter well

However, since the outer diameter of the filter paper disc is constantly changing during the continuous measurement of the winding and unwinding filter paper roll, the torque provided by the winding and unwinding mechanism controlled by the stepping motor is also constantly changing, so it is impossible to provide a constant filter paper force , and it cannot guarantee that the filter paper belt will always remain in a tight state during the moving process, which will easily cause the filter paper belt to break or be damaged

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