Method for adjusting deviation of two sides of reheating steam temperature of four-corner tangential firing boiler by SOFA air doors

Abstract

The invention relates to a method for adjusting deviation of two sides of the reheating steam temperature of a four-corner tangential firing boiler by SOFA air doors. The method for adjusting the deviation of the two sides of the reheating steam temperature of the four-corner tangential firing boiler by the SOFA air doors comprises the steps that horizontal pendulum angles of the SOFA air doors are adjusted; when the deviation of two sides of the reheating steam temperature is removed, vertical pendulum angles of the SOFA air doors are no longer adjusted; when the deviation of two sides of thereheating steam temperature is not removed, the vertical pendulum angles of the SOFA air doors are adjusted; and when the vertical pendulum angles of the SOFA air doors are adjusted, firstly, the vertical pendulum angles of a second SOFA air door and a third SOFA air door are adjusted obliquely upwards, and then, the vertical pendulum angles of a first SOFA air door and a fourth SOFA air door areadjusted to horizontal positions. The adjustment of the reheating steam temperature and temperature-decreased water flow is realized through the cooperative cooperation of the horizontal pendulum angles and the vertical pendulum angles of the SOFA air door, through the nonsynchronous adjustment of the horizontal pendulum angles and the vertical pendulum angles, the deviation of two sides of smoketemperature of the four-corner tangential firing boiler is rapidly reduced, the high-temperature point of the reheater pipe wall is reduced, the problems of large deviation of a reheater outlet stream temperature and the unbalanced temperature-decreased water flow on two sides are solved, finally, the average stream temperature of the reheater outlet is improved, and the temperature-decreased water flow of the reheater is reduced.

Description

technical field [0001] The invention relates to the field of combustion optimization and safe and economical operation of a coal-fired power plant, in particular to a method for adjusting a SOFA damper to adjust the deviation of both sides of the reheating steam temperature of a four-corner tangential combustion boiler. Background technique [0002] As of the end of 2017, the installed capacity of power generation in the country was about 1.77 billion kilowatts, of which the installed capacity of coal power was about 1.01 billion kilowatts, and the unit capacity of more than 300 million units accounted for more than 80%. The three major main engines of coal power units include boilers, steam turbines and generators. Coal-fired boilers in power stations can generally be divided into pulverized coal boilers and circulating fluidized bed boilers. The front and rear walls of the swirl burner are arranged in a counter-combustion mode and a W-shaped flame combustion mode. Among t...

AI Technical Summary

Problems solved by technology

Although the original intention of SOFA damper design is to alleviate the residual rotation by adjusting the horizontal swing angle anti-cutting technology, in actual operation, the adjustment of the horizontal swing angle anti-cutting technology cannot effectively eliminate the deviation of the flue gas temperature on both sides of the boiler

In actual operation, when the reheater pipe wall is partially overheated, the general power plant will remedy the imbalance of the desuperheating water volume of the reheater, or reduce the temperature of the reheated steam, which will affect the economic operation of the unit.

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