射流汽化吸液装置在泡沫降尘技术中的应用研究
发布时间：2018-08-02 21:42
【摘要】：矿尘是煤矿生产的主要灾害之一。目前,我国煤矿井下综掘工作面粉尘浓度频繁超标,泡沫除尘利用泡沫的黏附性对尘源进行覆盖,实现了高效抑尘的效果。但受井下复杂环境限制,泡沫除尘系统的整体可靠性仍需加强,尤其是发泡剂添加环节受井下水压波动、受限空间等因素影响,因此针对井下泡沫降尘系统中发泡剂添加环节,本文利用射流汽化吸液原理,设计了射流汽化吸液装置,实现了在井下复杂环境下,发泡剂稳定的稳定添加,提升了泡沫除尘系统的可靠性,并成功应用到综掘工作面中。基于射流装置在汽化过程中具有极限吸液量的特性,分析了射流装置的汽化吸液原理,利用有限空间射流理论,研究了多喷嘴及单喷嘴射流装置的基本方程,为射流装置的设计提供理论基础。根据射流添加装置在汽化过程中具有最大稳定吸液量的特性,利用CFD数值模拟软件,分析了不同喷嘴个数的射流添加装置的吸液过程,可以得出随着喷嘴个数的增加,射流装置内汽化程度逐渐降低,且射流吸液过程中汽液交界面随时间震荡;对射流添加装置性能进行了实验室实验,得出低压力比吸液稳定,高压力比吸液波动的特性。压力比在0-0.25范围内变化时,吸液量维持在3.2L/h稳定不变;当压力比的范围在0.25-0.73范围内时,吸液量出现波动。依据模拟及实验分析,设计了适用于泡沫降尘系统的射流汽化吸液装置,解决了由于井下压力波动,无法实现发泡剂精细化稳定添加的问题。研发了一套环形立式供气发泡器,并将射流汽化吸液装置、筒式发泡器、喷嘴及支架等部件作为整体进行组装集成,解决在掘进工作面狭小空间处泡沫制备效率低的问题,应用在潘二矿掘进工作面,掘进面巷道中的全尘和呼尘的浓度分别降低到了42 mg/m3和10 mg/m3,降尘率达到了92.7%和92.4%,改善职工的作业环境。
[Abstract]:Mine dust is one of the main disasters in coal mine production. At present, dust concentration in fully mechanized driving face of coal mine in our country frequently exceeds the standard, foam dust removal covers dust source with foam adhesion, and achieves the effect of high efficiency dust suppression. However, due to the limitation of complex environment, the overall reliability of foaming dust removal system still needs to be strengthened, especially the foaming agent adding link is affected by the downhole water pressure fluctuation, limited space and so on, therefore, aiming at the foaming agent adding link in the downhole foam dedusting system, Based on the principle of jet vaporization and liquid absorption, a jet vaporization suction device is designed in this paper, which realizes the stable and stable addition of foaming agent in complex underground environment, enhances the reliability of foam dust removal system, and successfully applies it to fully mechanized working face. Based on the characteristic that the jet device has the limit amount of liquid absorption in the vaporization process, the principle of the vaporization of the jet device is analyzed, and the basic equations of the multi-nozzle and single-nozzle jet device are studied by using the theory of finite space jet. It provides a theoretical basis for the design of jet device. According to the characteristics of the maximum stable liquid absorption in the vaporization process of the jet adding device, the absorption process of the jet adding device with different number of nozzles is analyzed by using the CFD numerical simulation software, and it can be concluded that with the increase of the number of nozzles, The vaporization degree in the jet device decreases gradually, and the interface between steam and liquid oscillates with time during the jet suction process. The experimental results show that the performance of the jet adding device is stable in the low pressure ratio and fluctuating in the high pressure ratio. When the pressure ratio varies in the range of 0-0.25, the amount of liquid absorption remains stable at 3.2L/h, and when the pressure ratio is in the range of 0.25-0.73, the amount of liquid absorption fluctuates. Based on the simulation and experimental analysis, a jet vaporization suction device suitable for foam dust control system is designed, which solves the problem that the fine and stable addition of foaming agent can not be realized because of the fluctuation of downhole pressure. A set of annular vertical air supply foaming device was developed, and the parts such as jet vaporization suction device, cylinder foam apparatus, nozzle and support were assembled as a whole to solve the problem of low foam preparation efficiency in narrow space of tunneling face. The concentration of total dust and exhaling dust in the roadway of Paner Coal Mine is reduced to 42 mg/m3 and 10 mg / m3 respectively, and the dust reduction rate is up to 92.7% and 92.4% respectively, and the working environment of the workers is improved.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD714.4;O358
本文编号：2160841
[Abstract]:Mine dust is one of the main disasters in coal mine production. At present, dust concentration in fully mechanized driving face of coal mine in our country frequently exceeds the standard, foam dust removal covers dust source with foam adhesion, and achieves the effect of high efficiency dust suppression. However, due to the limitation of complex environment, the overall reliability of foaming dust removal system still needs to be strengthened, especially the foaming agent adding link is affected by the downhole water pressure fluctuation, limited space and so on, therefore, aiming at the foaming agent adding link in the downhole foam dedusting system, Based on the principle of jet vaporization and liquid absorption, a jet vaporization suction device is designed in this paper, which realizes the stable and stable addition of foaming agent in complex underground environment, enhances the reliability of foam dust removal system, and successfully applies it to fully mechanized working face. Based on the characteristic that the jet device has the limit amount of liquid absorption in the vaporization process, the principle of the vaporization of the jet device is analyzed, and the basic equations of the multi-nozzle and single-nozzle jet device are studied by using the theory of finite space jet. It provides a theoretical basis for the design of jet device. According to the characteristics of the maximum stable liquid absorption in the vaporization process of the jet adding device, the absorption process of the jet adding device with different number of nozzles is analyzed by using the CFD numerical simulation software, and it can be concluded that with the increase of the number of nozzles, The vaporization degree in the jet device decreases gradually, and the interface between steam and liquid oscillates with time during the jet suction process. The experimental results show that the performance of the jet adding device is stable in the low pressure ratio and fluctuating in the high pressure ratio. When the pressure ratio varies in the range of 0-0.25, the amount of liquid absorption remains stable at 3.2L/h, and when the pressure ratio is in the range of 0.25-0.73, the amount of liquid absorption fluctuates. Based on the simulation and experimental analysis, a jet vaporization suction device suitable for foam dust control system is designed, which solves the problem that the fine and stable addition of foaming agent can not be realized because of the fluctuation of downhole pressure. A set of annular vertical air supply foaming device was developed, and the parts such as jet vaporization suction device, cylinder foam apparatus, nozzle and support were assembled as a whole to solve the problem of low foam preparation efficiency in narrow space of tunneling face. The concentration of total dust and exhaling dust in the roadway of Paner Coal Mine is reduced to 42 mg/m3 and 10 mg / m3 respectively, and the dust reduction rate is up to 92.7% and 92.4% respectively, and the working environment of the workers is improved.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD714.4;O358
【参考文献】
相关期刊论文 前2条
1 梁爱国,刘景植,龙新平,朱劲木;射流泵内流动的数值模拟及喉管优化[J];水泵技术;2003年01期
2 蒋仲安,李怀宇;泡沫除尘技术的研究与应用[J];中国安全科学学报;1997年03期
，本文编号：2160841
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