Intelligent pulverized coal concentration, speed and fineness on-line monitoring leveling system and method thereof

Abstract

The invention discloses an intelligent pulverized coal concentration, speed and fineness on-line monitoring leveling system. The system comprises a pulverized coal concentration, speed and fineness integrated measuring device and an on-line leveling device which are installed in a primary air pipe between a coal mill outlet and a boiler inlet, and the pulverized coal concentration, speed and fineness integrated measuring device and the on-line leveling device are in communication connection with a boiler air and pulverized coal on-line balance system; and the pulverized coal concentration, speed and fineness integrated measuring device is used for collecting concentration, speed and fineness signals of pulverized coal in the primary air pipe, the boiler air and pulverized coal on-line balance system is used for controlling the on-line leveling device to adjust the flow and flowing speed of the pulverized coal inside a coal mill outlet pulverized coal pipe according to a pulverized coalsignal and a current opening signal of the on-line leveling device. According to the intelligent pulverized coal concentration, speed and fineness on-line monitoring leveling system, the integrated on-line measuring and leveling closed loop technology is adopted, primary air and pulverized coal thermal state leveling is achieved, and assistance is provided for achieving optimized burning, improving the boiler efficiency and reducing the net coal consumption rate.

Description

Technical field [0001] The invention relates to an intelligent online monitoring and leveling system and method for the concentration, speed and fineness of pulverized coal, and belongs to the technical field of boiler monitoring and control in coal-fired power plants. Background technique [0002] Due to the lack of reliable and accurate measurement technology and control and adjustment methods, domestic coal-fired power plants cannot accurately and reliably measure the flow of pulverized coal in the primary air duct at present, and the flow distribution of pulverized coal in the primary duct is also uneven. This phenomenon will directly affect the ignition and stable combustion of the pulverized coal airflow at the exit of the burner, easily causing flame deflection, scouring of the furnace wall, furnace heat load and temperature deviation, over-oxygen combustion, increased NOx emissions, and also cause coal in the horizontal pipeline The deposition of powder leads to tube bloc...

AI Technical Summary

Problems solved by technology

[0002] Due to the lack of reliable and accurate measurement technology and control and adjustment methods, domestic coal-fired power plants cannot achieve accurate and reliable measurement of the flow state of pulverized coal in the primary air duct at present, and the flow distribution of pulverized coal in the primary pulverized duct also has the problem of unevenness

This phenomenon will directly affect the ignition and stable combustion of the pulverized coal flow at the outlet of the burner. Powder deposition, leading to plugging, causing corresponding burners to burn out, and even causing local reducing atmosphere to be strong, resulting in local high-temperature corrosion or coking on the heating surface, tube explosion and other problems, which seriously affect the safety and economy of unit operation.

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