A method for measuring radiation heat transfer of combustion flame based on spectral detection

Abstract

The invention belongs to the field of combustion measurement, and discloses a method for measuring combustion flame radiation heat transmission quantity based on spectrum detection. The method comprises the following steps: 1) acquiring flame spectrum; 2) acquiring flame radiant power at each point by the integral of the flame spectral radiation intensity of each point obtained in the step 1) overwavelength; 3) acquiring e flame loop radiation quantity; and 4) acquiring flame radiation heat transmission quantity. The method is based on a spectrometer to detect the flame spectral radiation intensity, constructs a model between the combustion flame radiation heat transmission quantity and the flame spectral radiation intensity to obtain the combustion flame radiation heat transmission quantity, and can effectively reduce measurement errors.

Description

technical field [0001] The invention belongs to the field of combustion measurement, and more specifically relates to a method for measuring the radiation heat transfer of combustion flames based on spectral detection. Background technique [0002] Combustion flames widely exist in various industrial combustion systems such as boilers and furnaces, and radiation heat transfer is usually the main heat transfer method of these combustion flames. Accurate measurement or calculation of the radiative heat transfer of the combustion flame is of great significance to combustion detection and improvement of combustion state. Radiation heat transfer can also be used to evaluate the utilization rate of fuel, and further improve the energy utilization rate by improving the combustion mode of the flame, so as to save energy and protect the environment. In the temperature range often encountered in industry, the wavelength distribution range of flame heat radiation mainly includes three...

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Problems solved by technology

Existing equipment can often only measure parameters such as flame temperature, blackness, and radiation intensity. If a heat flow meter is used to directly measure the radiation heat flux density of the flame, only the heat flow value in a certain direction can be obtained, and the overall radiation of the flame cannot be obtained. At the same time, the distance between the measurement position of the heat flow meter and the flame has a significant impact on the measurement results of the heat flow meter, which is not conducive to accurate measurement; and the simplified method is often used for the calculation of radiation heat transfer in the boiler furnace, that is, both the flame and the furnace wall are regarded as black bodies. Assuming that the flame blackness is uniform, the average temperature of the flame is regarded as the real temperature of the flame, but in fact the heat radiation of the gas in the flame has obvious non-ash properties, and the temperature of the flame has a large difference in different positions, so this calculation There is a large calculation error in the method; in the calculation of fire radiation heat transfer, the point source method is often used to calculate the radiation heat transfer of the flame. This method will also produce a large error, which is far from the actual result

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