Combustor with adjustable over-fire air supply characteristics

Abstract

The invention discloses a combustor with adjustable over-fire air supply characteristics, the combustor comprises an outer over-fire air pipe, an inner over-fire air pipe, variable-section baffles, gears and long-handle racks, the inner over-fire air pipe comprises shaft holes and an inner over-fire air pipe shell, the variable-section baffles comprise rotating shafts and flat plates, the centralaxes of the outer over-fire air pipe and the inner over-fire air pipe are collinear, the outer over-fire air pipe and the inner over-fire air pipe are sequentially arranged from outside to inside, thetwo ends of the variable-section baffles are in running fit with the shaft holes in the inner over-fire air pipe, the gears are in interference fit with the variable-section baffles, and the racks are arranged on the side surface of the inner over-fire air pipe and are in meshing transmission with the gears. According to the combustor with the adjustable over-fire air supply characteristics, in the variable-load peak regulation process of a thermal power generating unit, by adjusting the arrangement mode of the variable-section baffles, the circulation sectional area, the section height-widthratio and the rectangular section distribution characteristic of over-fire air are changed, so that high jet speed and rigidity of over-fire air jet flow can be guaranteed under different load working conditions, and the flame combustion characteristic in a furnace under low load is effectively improved.

Description

technical field [0001] The invention relates to the technical field of power station peak regulation, in particular to a burner with adjustable air supply characteristics of overfired air. Background technique [0002] Due to the strong randomness and intermittency of wind power and photovoltaic power generation, their large-scale grid connection will have a negative impact on the safe and stable operation of the power grid. In order to improve the consumption capacity of renewable energy, thermal power units, which undertake more than 70% of the country's power generation, must undertake the peak-shaving task of the power grid, and will gradually change from the main body of power supply to the main body of power supply and peak-shaving. [0003] At present, thermal power units with deep peak-shaving capabilities are bound to occupy a leading position in my country's future power supply system, but they will also face many problems in the process of wide-load changes, such ...

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Problems solved by technology

[0003] At present, thermal power units with deep peak-shaving capabilities are bound to occupy a leading position in my country's future power supply system, but they will also face many problems in the process of wide-load changes, such as the total air volume of boilers decreases with the total coal volume at low loads. In order to ensure that the overfire air with different flow rates in a wide range of load changes still has a high flow rate and rigidity, and reduce the heat loss of incomplete combustion, a burner with adjustable air supply characteristics of the overfire air will become Hot demand for research in this field

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