Dust concentration detecting method and detector with gas velocity compensation

Abstract

The invention relates to a dust detection technology, and aims at providing a dust concentration detecting method and a dust concentration detector with gas velocity compensation. The dust concentration detecting method comprises a calibrating step and a measuring step. The calibrating step comprises the following sub-steps of: respectively recording signal strengths transmitted by a dust detection probe under different gas flow velocities, respectively measuring by using a weighing device so as to obtain dust concentrations at corresponding moments; and determining a coefficient and inputting the coefficient into a programmable controller. The measuring step comprises the following sub-steps of: obtaining the signal strengths and gas flow velocities of a dust instrument from the dust detection probe and a gas flowmeter respectively; and obtaining the dust concentration in the measuring process through the programmable controller, and transmitting final data of the dust concentration to a display device. According to the dust concentration detecting method and the dust concentration detector, disclosed by the invention, the influences of the gas flow velocities on the dust concentration are considered, so that the precision of detecting the dust concentration is largely improved in the occasions that the gas flow velocity is changed largely.

Description

technical field [0001] The invention relates to dust detection technology, more specifically, the invention relates to a dust detection method and a detector which can compensate the speed and adopt the AC coupling technology. Background technique [0002] Dust detectors are widely used in metallurgical industry, chemical industry, building materials industry and environmental protection industry. Existing dust detectors generally claim that the signal strength has a linear relationship with the dust concentration, but has no relationship with the gas velocity. However, the actual data show that, under the condition of constant dust concentration, the signal strength of the dust detector increases with the increase of airflow velocity, and the signal intensity and airflow velocity present a standard quadratic relationship. In occasions where the speed changes little, the existing dust detector can work well. However, once the airflow velocity changes greatly, it will bring...

AI Technical Summary

Problems solved by technology

However, once the airflow velocity changes greatly, it will bring a large error and cannot accurately measure the dust concentration value.

For large rotating machinery (such as gas turbines, etc.), if the data given by the dust detector is less than the dust concentration in the actual airflow, it may cause monitoring errors, resulting in severe wear of the turbine blades and serious production problems. security incident

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