| 摘要: |
| 提出了以风机变频增风稀释工作面超限瓦斯为核心的变频查找法.由稀释公式可计算出稀释瓦斯的所需风量,通过查找方法不断地从风机特性曲线库中选择曲线并带入风网解算程序,解算的风量不断地与稀释瓦斯的需风量作比较,最终选择出一条最接近且大于稀释风量的风机特性曲线.通过变频器调频将风机调至此特性曲线下运行,进而稀释瓦斯.搭建了实验模型,模拟瓦斯浓度超限时风机变频稀释瓦斯.实验表明风机所处的常态频率越小其稀释能力越大,在稀释能力范围内,可快速将超限瓦斯稀释到安全值,且调风比趋近于1.证明了变频查找法具有快速性、精准性、随动性、稳定性以及较好的稀释效果且风量利用效率较高. |
| 关键词: 瓦斯 风量 风网解算 变频 风机特性曲线 |
| DOI： |
| 分类号:TD77+.1 |
| 基金项目:国家自然科学基金资助项目(51134023) |
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| Theory construction and experimental study of frequency-search method for diluting excess gas by increasing fan frequency |
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Wang Yuanyuan1,2,Jiang Shuguang2,Han Jing3, Hu Liming21,2,3
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1. School of Chemical and Environmental Engineering, Sichuan University of Science & Engineering, Zigong 643000, China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;3. School of Energy Resource and Safety, Anhui University of Science and Technology, Huainan 232001, China
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| Abstract: |
| Frequency-search method was presented bases that diluting excess gas by increasing fan frequency. The required airflow was calculated to dilute gas by the dilution formula, then from fan performance curve database, the curve was selected to take in ventilation networks calculating program by search method continually. By comparing the calculated volume with required volume, one curve was chosen whose air volume was a bit lager but proximate than required volume at last. By using frequency converter to adjust fan performance curve to the one selected to dilute gas, the experimental model was set up to simulate the fan changing of frequencies to dilute gas, while gas concentration gauge. Experimental results show that the smaller the fan normal frequency, and the lager its dilution ability.Within dilution ability, gas reduce to safe value, and its volume-regulation ratio is close to 1. It proved that frequency-search method is a fast, accurate, steady and servo method, which produce good dilution result and utilize efficiency of air volume. |
| Key words: gas air volume ventilation networks calculating program frequency conversion fan performance curve |
