Boiler furnace near-water-cooled wall reducing atmosphere test and combustion optimization adjustment system

Abstract

The invention provides a boiler furnace near-water-cooled wall reducing atmosphere test and combustion optimization adjustment system. The system comprises a flue gas sampling point, an inspection unit, a tail flue gas sampling analysis system, a sampling control unit and an optimization regulation and control unit, wherein the optimization regulation and control unit comprises an oxygen amount control module, a coal mill output control module, a primary air pressure control module and a secondary air door control module, and is used for respectively regulating and controlling the operation oxygen amount control, the reasonable configuration of the coal feeding amount of the mill group, the primary air pressure control, the secondary air door and the over fire air according to the regulated and controlled adjustment parameters. The system has the beneficial effects that the inspection unit is adopted, and only one reducing flue gas analyzer is used, so that the number of test sample points is ensured, the real-time monitoring of reducing atmosphere measurement data can be realized, and the investment and maintenance costs are reduced; optimization and adjustment of the secondary air door, the operation oxygen amount, the operation primary air pressure and the coal mill output configuration are achieved through optimization treatment of the control unit, and the reducing atmosphere of the near-water-cooled wall of the furnace is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal power unit safety, and in particular relates to a reducing atmosphere test and combustion patrol optimization system near a water wall of a boiler furnace. Background technique [0002] High-temperature corrosion of the water-cooled wall refers to the phenomenon that the sulfur in the fuel generates a corrosive ash layer or slag layer and a corrosive atmosphere during the combustion process, causing the surface of the water-cooled wall tube to be corroded. Many scholars have studied the basis for judging high-temperature corrosion, and it is generally believed that the judging criteria are mainly the sulfur content of coal and the CO and H in flue gas. ２ S and O 2 volume fraction. [0003] Therefore, in order to study the influence of boiler-related parameter changes on the reducing atmosphere in the water-cooled wall area, it is necessary to extract flue gas from the wall of the furnace water-c...

AI Technical Summary

Problems solved by technology

However, the test timeliness of this test method is limited. Many power plants have not carried out this work, or have carried out the test annually, and the representativeness of the measured values ​​is relatively long. combustion adjustment

In addition, power plant operators have limited means to adjust the reducing atmosphere, and often have less consideration for adjustments, which will still lead to serious corrosion of the water wall

[0004] On the other hand, since the furnace reducing flue gas analyzer is a precision instrument, the investment is relatively large. If a single flue gas analyzer is installed at each measuring point, it will lead to increased investment and maintenance

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