礦用變頻主通風(fēng)機性能及噪聲實驗研究
[Abstract]:In order to solve the problem of large energy saving prediction in frequency conversion regulation, the experimental platform of mine main ventilator developed by ourselves is used. The performance experiment and noise characteristic experiment of K45-4- 9 / 18.5 kW axial flow main ventilator are carried out. Based on the classical formula of proportional law, the experimental data of fan performance parameters at different frequencies are processed by the least square method, and the optimum fitting order between air volume and wind pressure, shaft power and efficiency is obtained. And draw the main fan performance curve family under different frequency; The noise characteristics of main fan inlet at different frequencies are studied. The main noise frequency range and spectrum characteristics of main fan inlet noise are obtained. The main research results obtained in this paper are as follows: (1) the frequency conversion speed regulation of mine main ventilator should not be less than 50 times of rated speed; When the speed of speed is between 50% and 100% of the rated speed, the maximum experimental air flow rate is taken as the best operating point, and the energy saving rate between adjacent frequencies is compared. It is concluded that the maximum energy saving rate is 47. (2) the wind pressure-air volume curve of the main ventilator used in frequency conversion mine is the best fitting result in 5 times; The results of four times fitting are the best. (3) the performance curves of the main ventilator with variable frequency are similar and have remarkable non-equal ratio variation. The formula of the non-equal-ratio variation law provides a method for calculating the energy saving rate of the main fan. (4) the performance curve of the main ventilator is different in reasonable working area under different frequencies; The curve of axial power ratio and air volume ratio presents deceleration and non-equal ratio increasing, and finally tends to a certain limit value, indicating that the main fan frequency conversion to a certain extent will no longer have the benefit of energy saving; With the decrease of frequency, the maximum efficiency corresponding to the performance curve of frequency conversion main ventilator decreases, and the error calculated at similar rate increases. (5) when the frequency is 50Hz, The main fan performance curve of power frequency and frequency conversion 100% is similar; The frequency conversion operation is more energy efficient than the power frequency 100% operation, and the maximum energy saving rate between the two is 2.94. The efficiency of power frequency is a little higher than that of frequency conversion 100%, and the maximum efficiency difference is 2.933. (6) the noise frequency of the main ventilator inlet is mainly distributed in the frequency range of 125Hz?4000Hz, that is, the medium and low frequency noise; The variation trend of the noise spectrum characteristic curve at different frequencies is roughly the same, and the noise of the frequency conversion main ventilator has attenuation characteristics, that is, the noise decreases with the decrease of the frequency, and the noise rate increases during the attenuation process.
【學(xué)位授予單位】:湖南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TD441
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