Secondary air channel adjusting device of power station boiler and combustion numerical simulation method

Abstract

The invention provides a secondary air channel adjusting device of a power station boiler. The adjusting device is used for controlling the feeding amount of secondary air in a furnace of the power station boiler, and comprises adjusting baffles and a secondary air adjusting baffle sensor, wherein the adjusting baffles are obliquely inserted into all secondary air channel of the power station boiler, and the feeding amount of the secondary air is controlled through changing the insertion length; and the secondary air adjusting baffle sensor is connected with the adjusting baffles and is used for controlling the adjusting baffles to act, and the secondary air adjusting baffle sensor is also in communication connection with a coal feeding amount sensor arranged in the power station boiler, and controls the insertion length of the adjusting baffles according to the coal feeding amount change monitored by the coal feeding amount sensor. A combustion numerical simulation method of the powerstation boiler is further provided, so that the combustion temperature and the NOx emission in the power station boiler, and the concentration distribution of CO and O2 in the furnace are obtained.

Description

Technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a secondary air channel adjustment device and a combustion numerical simulation method of a power station boiler. Background technique [0002] With the steady development of my country's economy, the quality of life of the people continues to improve, and both industry and residential electricity consumption are on the rise, which has led to a rapid increase in the peak-to-valley difference of the power grid. As a result, the boiler often runs under low load conditions, making the overall temperature of the boiler lower, and the aerodynamic plant is weaker when the load is higher. Due to the reduction of the overall air supply in the furnace, the secondary air speed and air pressure are reduced, the disturbance between it and the primary air is reduced, the overall rigidity of the air flow is weakened, and a good tangent circle is not formed, which delays the igni...

AI Technical Summary

Problems solved by technology

Due to the reduction of the overall air supply volume in the furnace, the secondary air velocity and air pressure are reduced, the disturbance between it and the primary air is reduced, the overall rigidity of the air flow is weakened, and a good tangential circle is not formed, which delays the ignition time of the pulverized coal and the center of the flame rises. shift, resulting in unstable combustion, and even fire extinguishing in severe cases

Although the experiment is intuitive and reliable, it can guide the design and production of boiler products, but the test period is long, the cost is huge, and it is difficult to obtain comprehensive and satisfactory data. It is more difficult to manufacture a full-scale model in today's high-parameter, large-capacity equipment. It is even more impossible, and it is more difficult to measure the regular characteristics of combustion, flow, and heat transfer in the furnace

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