On-line monitoring system and method for concentration deviation between pulverized coal conveying pipelines of coal mill

Abstract

The invention provides an on-line monitoring system for concentration deviation between pulverized coal conveying pipelines of a coal mill, which comprises a plurality of on-line constant-speed pulverized coal sampling and measuring devices and a system measurement control unit, and the on-line constant-speed pulverized coal sampling and measuring devices are respectively arranged on a plurality of pulverized coal pipelines at the outlet of the same coal mill; and the on-line constant-speed pulverized coal sampling and measuring devices are respectively connected with the system measurement control unit through control signal lines, and the system measurement control unit comprises an intelligent processor and a display unit and is used for performing logic sequential control on the online constant-speed pulverized coal sampling and measuring devices and processing and transmitting measurement signals. By measuring the relative concentration deviation between the pulverized coal pipelines of the same coal mill, pulverized coal concentration distribution balance between the pulverized coal pipelines is achieved, and pulverized coal concentration balance control between the different pipelines of the coal mill is simplified.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of solid phase concentration deviation in gas-solid two-phase flow, in particular to an on-line monitoring system and method of concentration deviation between pulverized coal pulverizer pipelines. Background technique [0002] The coal pulverization system of large and medium-sized coal-fired power plants grinds massive or large-grained coal into finer coal powder, which is carried by hot air and sent to the boiler furnace for combustion through the coal powder pipeline. There are 4-6 pulverized coal delivery pipes at the outlet, and the ideal boiler design assumes that the pulverized coal concentration and nozzle velocity of the burners on the same floor are the same, so as to ensure that the boiler is in a safe and economical operating state. In the actual boiler operation process, due to the different direction and length of each pulverized coal pipeline, although the manually adjus...

AI Technical Summary

Problems solved by technology

There are many uncertainties in the accuracy of this concentration measurement due to the influence of the charged amount of pulverized coal on wind speed, humidity of pulverized coal, fineness of pulverized coal and flow field.

Moreover, the electrostatic induction probe in this patent has a relatively limited sensing range at the installation measuring point, and there are also problems with the representativeness of its detection.

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