Primary air automatic leveling algorithm for power station boiler

Abstract

The invention discloses a primary air automatic leveling algorithm for a power station boiler, which comprises the following steps: (1) after receiving primary air speed measured by a pipeline grinding sensor, a leveler analyzes whether the primary air speed needs to be adjusted or not; (2) when adjustment is needed, a pipeline with the maximum primary air speed and a pipeline with the minimum primary air speed are found and marked as Pmax and Pmin; (3) when a Pmin throttling valve is not fully opened, a pre-adjusting pipeline is Pmin and is adjusted in the opening direction; and when the Pmin throttle valve is fully opened, the pre-adjusting pipeline is Pmax and is adjusted towards the closing direction; (4) whether a risk exists after the adjusted pipeline is adjusted is judged, and the process enters the next period if the risk exists; and (5) the adjusted pipeline throttle valve acts, and then the next period is started. The primary air automatic leveling algorithm has the following beneficial effects: 1, at least one pipeline throttle valve is ensured to be fully opened when one mill is used for leveling, and the resistance to primary air conveying is minimum; 2, only one pipeline is operated in each period, so that the safe operation of a unit is not obviously interfered; and 3, the primary air of the mill is leveled intelligently, and manpower is saved.

Description

technical field [0001] The invention relates to an automatic leveling algorithm of primary air used for power plant boilers. Background technique [0002] Whether the primary air of the power plant boiler is leveled is of great significance to the combustion. It will not only affect the distribution of pulverized coal in the primary air pipe, but also the shape and size of the furnace cut circle. If the wind speed deviation is large, it will also wash the water wall, resulting in large deviation of steam temperature on both sides of the furnace, furnace slagging, tube burst, and even furnace flameout, which will have a great impact on the safety and economy of the boiler. [0003] At present, power plant boilers lack automatic primary air leveling equipment and leveling algorithms. Most of them rely on adjustable shrinkage holes to manually adjust the primary air deviation in the cold state, and measure the wind speed in the pipes in the cold state through Pitot tube measure...

AI Technical Summary

Problems solved by technology

If the wind speed deviation is large, it will also wash the water wall, resulting in a large deviation of the steam temperature on both sides of the furnace, slagging in the furnace, bursting of the tube, and even the flameout of the furnace, etc., which will have a great impact on the safety and economy of the boiler.

[0003] At present, power plant boilers lack automatic primary air leveling equipment and leveling algorithms. Most of them rely on adjustable shrinkage holes to manually adjust the primary air deviation in the cold state, and measure the wind speed in the pipes in the cold state through Pitot tube measurement, and then adjust each pipe. In order to achieve the balance of the primary air in the cold state, this not only requires a lot of manpower and material resources, but also there is still a large deviation of the primary air in the hot state after the cold state is adjusted.

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