On-line monitoring system for coal-combustion overall process of power station boiler

Abstract

The invention discloses an on-line monitoring system for a coal-combustion overall process of a power station boiler, comprising a DCS system and an MIS system, wherein the DCS system is respectively connected with a temperature field monitoring subsystem in the boiler and a fly-ash carbon content monitoring subsystem; the MIS system is connected with an industrial personal computer; the temperature field monitoring subsystem in the boiler comprises a plurality of infrared temperature measuring instruments which are fixedly distributed at the outer side of an observation hole of a boiler hearth; the fly-ash carbon content monitoring subsystem comprises a microwave signal generator, an emitting antenna, a receiving antenna, a dynamometer and a fly-ash sampling tube; the emitting antenna and the receiving antenna are oppositely arranged at the two sides of the fly-ash sampling tube and are connected with the dynamometer; and the output end of the microwave signal generator is connected to the input ends of the emitting antenna and the dynamometer. The on-line monitoring system not only has accurate measurement, but also has fast real-time response, can conduct on-line prediction on the coal quality of coal in the boiler by combining the DCS system, the MIS system and the industrial personal computer, and solve the problem that a combustion optimizing system cannot be adaptive to the changeability of the coal quality.

Description

technical field [0001] The invention belongs to the field of boiler combustion optimization and combustion diagnosis, and in particular relates to an online monitoring system for the whole process of coal combustion of a power station boiler. Background technique [0002] At present, the vast majority of power plants in my country have the situation that the actual coal type deviates from the designed coal type. Due to the shortage of coal resources or the price, the nearby small coal kiln is mixed with the coal, and the coal type changes too much. The coal quality analysis of the power plant and the carbon content test results of the fly ash after combustion have to be delayed for at least one day. The boiler combustion system has not been able to monitor the real-time operation status, and the operators can only operate by experience, resulting in the combustion of pulverized coal in the power plant boiler. The process is in a "black box" state, resulting in a significant de...

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Problems solved by technology

[0010] The purpose of the present invention is to provide an online monitoring system for the whole process of coal combustion in power plant boilers in view of the fact that many current combustion optimization control systems cannot adapt to the frequent changes in coal quality

The system can predict the coal quality of the furnace coal online, and solve the problem that the combustion optimization system cannot adapt to the variable coal quality

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