【摘要】：為了解決普遍存在的變頻調(diào)節(jié)節(jié)能預(yù)估偏大的問(wèn)題,利用自主研制的礦用主通風(fēng)機(jī)實(shí)驗(yàn)平臺(tái),開(kāi)展了多變頻率下K45-4-№9/18.5k W軸流主通風(fēng)機(jī)性能實(shí)驗(yàn)和噪聲特性實(shí)驗(yàn)。以經(jīng)典的比例定律公式為基礎(chǔ),應(yīng)用最小二乘法進(jìn)行了不同頻率下風(fēng)機(jī)性能參數(shù)的實(shí)驗(yàn)數(shù)據(jù)處理,得到了風(fēng)量與風(fēng)壓、軸功率、效率之間的最佳擬合階數(shù),并繪制了不同頻率下的主通風(fēng)機(jī)性能曲線族;研究了主通風(fēng)機(jī)進(jìn)氣口在不同頻率下的噪聲特性,得出主通風(fēng)機(jī)進(jìn)氣口噪聲的主要噪聲頻率范圍和頻譜特性。本文取得的主要研究成果如下:(1)礦用主通風(fēng)機(jī)變頻調(diào)速不宜低于額定轉(zhuǎn)速的50%;在額定轉(zhuǎn)速的50%?100%之間調(diào)速時(shí),以實(shí)驗(yàn)最大風(fēng)量點(diǎn)為最佳工況點(diǎn),對(duì)比相鄰頻率間的節(jié)能率,得出最大節(jié)能率達(dá)到47%。(2)變頻礦用主通風(fēng)機(jī)風(fēng)壓-風(fēng)量曲線以5次擬合效果最佳;軸功率-風(fēng)量曲線和效率-風(fēng)量曲線以4次擬合效果最佳。(3)變頻主通風(fēng)機(jī)不同頻率下的性能曲線具有相似性,同時(shí)具有顯著的非等比變化特性;該非等比變化律公式提供了一種主通風(fēng)機(jī)變頻節(jié)能率的計(jì)算方法。(4)變頻主通風(fēng)機(jī)不同頻率下的風(fēng)機(jī)性能曲線合理工作區(qū)域不同;軸功率比-風(fēng)量比曲線呈現(xiàn)減速非等比遞增,并最終趨于某一極限值,表明主通風(fēng)機(jī)變頻到一定程度將不再會(huì)有節(jié)能收益;隨著頻率的下降,變頻主通風(fēng)機(jī)性能曲線所對(duì)應(yīng)的最大效率值減小,與按相似率計(jì)算的誤差增大。(5)當(dāng)頻率為50Hz時(shí),工頻與變頻100%兩種情況下的主通風(fēng)機(jī)性能曲線是相似的;變頻運(yùn)行比工頻100%運(yùn)行更節(jié)能,且兩者間的最大節(jié)能率為2.94%;工頻下的效率略大于變頻100%下的效率,最大效率差達(dá)到2.93%。(6)變頻主通風(fēng)機(jī)進(jìn)氣口的噪聲頻率主要分布在125Hz?4000Hz的頻率段,即主要為中低頻噪聲;不同頻率下的噪聲頻譜特性曲線變化趨勢(shì)大體相同,且變頻主通風(fēng)機(jī)噪聲存在著衰減特性,即噪聲隨著頻率的降低而減小;噪聲在衰減過(guò)程中,噪聲變化率呈現(xiàn)增大的趨勢(shì)。
[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(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD441

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