Detection method and detection device for flowing conditions of pulverized coal conveyed in high pressure dense phase pneumatic mode

Abstract

The invention discloses a detection method and detection device for flowing conditions of pulverized coal conveyed in a high pressure dense phase pneumatic mode. The detection method comprises the following steps of collecting static signals on an electrostatic sensor probe and pressure difference signals of a pressure difference sensor, carrying out empirical mode decomposition processing on the collected static signals and the pressure difference signals respectively to obtain a Hurst index H, dividing the static signals and the pressure difference signals into multiple different scales according to fractal characteristics and the value of the Hurst index H, calculating the energy proportion of different scales of the static signals and judging the value of the energy proportion, using the energy proportion and the value relation of different scales as necessary parameters to carry out judgment of the flow condition of the high pressure dense phase pneumatic conveying pulverized coal. The judgment criterions are suitable for various situations of conveying carrier gas, practicability is wide, the static signals and the pressure difference signals are adopted as double judgment standards at the same time, and thus accuracy is high. Signal pickup assembly of the detection device comprises the electrostatic sensor probe, a preposition voltage amplifier circuit, a pressure sensor, a data acquisition card and a computer.

Description

technical field [0001] The invention belongs to the technical field of flow detection of gas-solid two-phase flow, in particular to the detection technology of the flow state of high-pressure dense-phase pneumatic conveying. Background technique [0002] Coal gasification technology is to maintain a certain temperature under normal pressure or pressurized conditions, and generate coal gas through the reaction of gasification agent and coal. The main components of coal gas are combustible gases such as carbon monoxide, hydrogen, and methane. Coal can be desulfurized and nitrogen removed during gasification, and ash and slag can be discharged. Therefore, coal gas becomes a clean fuel. High-pressure dense-phase pulverized coal pneumatic transportation is one of the key links in coal gasification technology. The stability of its transportation and the flow characteristics of pulverized coal in the transportation pipeline directly affect the gasification products of coal. Therefo...

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Problems solved by technology

At present, there is a method to judge whether the transportation has reached the critical pipe plugging state by calculating whether the "root mean square / average value" of the pressure signal is within a certain range, but the range is affected by the delivery of the carrier gas, and this method only gives Delivery carrier gas is air and CO 2 time range, so the scope of application is limited

At the same time, with the development of detection technology, the fluctuation signal of the conveying system extracted by electrostatic and acoustic emission detection technology also contains a lot of flow-related information, and this information is not included in the pressure signal, so only the pressure signal is used As the basis for judging flow instability, the eigenvalues ​​of

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