發(fā)布時(shí)間：2018-03-12 20:19

  本文選題：礦井通風(fēng)系統(tǒng)　切入點(diǎn)：可靠性　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：礦井通風(fēng)系統(tǒng)主要是由通風(fēng)網(wǎng)絡(luò)、主風(fēng)機(jī)系統(tǒng)及其配套設(shè)備組成的大型復(fù)雜可修系統(tǒng),具有很強(qiáng)的不確定性,各子系統(tǒng)相互間又彼此關(guān)聯(lián),其對(duì)于地下礦山開(kāi)采及井下人員安全擔(dān)負(fù)著重要責(zé)任。通常,礦山服務(wù)年限不斷增長(zhǎng)、開(kāi)采規(guī)模及開(kāi)采深度的增大導(dǎo)致其內(nèi)部發(fā)生的變化都會(huì)使通風(fēng)系統(tǒng)的網(wǎng)絡(luò)結(jié)構(gòu)發(fā)生動(dòng)態(tài)變化,因而其可靠性必然有所下降,若其中任一環(huán)節(jié)發(fā)生問(wèn)題,將導(dǎo)致正常開(kāi)采工作無(wú)法進(jìn)行,甚至使作業(yè)工人的生命受到威脅。因此,對(duì)于通風(fēng)系統(tǒng)的可靠性研究,越來(lái)越受到礦山企業(yè)、技術(shù)人員以及眾多專家學(xué)者的重視。本文在前人研究成果的基礎(chǔ)上,結(jié)合礦井通風(fēng)學(xué)與可靠性相關(guān)理論技術(shù),運(yùn)用網(wǎng)絡(luò)流理論、Markov理論等相關(guān)知識(shí)與技術(shù)方法,以及ANSYSCFX軟件模擬,對(duì)通風(fēng)網(wǎng)絡(luò)與主通風(fēng)機(jī)系統(tǒng)的可靠性分析方法進(jìn)行詳盡的研究,主要內(nèi)容為:1、風(fēng)路可靠性的研究根據(jù)通風(fēng)網(wǎng)絡(luò)系統(tǒng)的固有屬性,建立風(fēng)路可靠度分析模型,以分支風(fēng)路的風(fēng)量監(jiān)測(cè)數(shù)據(jù)為基礎(chǔ),應(yīng)用統(tǒng)計(jì)擬合估計(jì)方法加以分析后得到分支風(fēng)路的風(fēng)量分布規(guī)律,給出了通風(fēng)網(wǎng)絡(luò)中風(fēng)路可靠度與故障率等概念,并建立對(duì)應(yīng)的數(shù)學(xué)公式,以《金屬非金屬礦山安全規(guī)程》(以下簡(jiǎn)稱《規(guī)程》)所規(guī)定的各類巷道風(fēng)量的風(fēng)速限定值及通風(fēng)系統(tǒng)實(shí)際運(yùn)行過(guò)程中的風(fēng)速經(jīng)驗(yàn)值為標(biāo)準(zhǔn),求得各分支風(fēng)路的可靠度,為進(jìn)一步分析通風(fēng)網(wǎng)絡(luò)的可靠度奠定了基礎(chǔ)。2、通風(fēng)網(wǎng)絡(luò)可靠性的研究以網(wǎng)絡(luò)流理論為基礎(chǔ),運(yùn)用簡(jiǎn)化的鄰接終點(diǎn)法求解通風(fēng)網(wǎng)絡(luò)最小路集并基于MATLAB編程實(shí)現(xiàn)此算法。提出了一種簡(jiǎn)化的不交化最小路集算法:對(duì)于任一長(zhǎng)度為m-1的最小路,只需在其中添加n-+ 1條該最小路中不出現(xiàn)的分支的逆,就可直接獲得不交化結(jié)果,其余最小路采用BDD算法進(jìn)行不交化運(yùn)算,通過(guò)以上方法可量化分析通風(fēng)網(wǎng)絡(luò)的可靠性,最后分析了各分支風(fēng)路敏感度;3、通風(fēng)動(dòng)力的可靠性研究主風(fēng)機(jī)是通風(fēng)系統(tǒng)的動(dòng)力來(lái)源,若其出現(xiàn)故障的話,將會(huì)導(dǎo)致系統(tǒng)無(wú)法正常運(yùn)行,所以必須對(duì)其進(jìn)行可靠性分析。本文應(yīng)用Markov過(guò)程理論分析了主風(fēng)機(jī)的可靠性,給出了其可靠度、故障率等可靠性指標(biāo)的定義及數(shù)學(xué)表達(dá)式,最后進(jìn)行了可靠性實(shí)例驗(yàn)證。4、通風(fēng)巷道的可靠性數(shù)值模擬當(dāng)井下巷道增設(shè)調(diào)節(jié)風(fēng)窗等構(gòu)筑物后,其中風(fēng)流的分布會(huì)發(fā)生動(dòng)態(tài)變化,本文運(yùn)用ANSYSCFX軟件建模,在一段長(zhǎng)50.5m的巷道內(nèi)增設(shè)一調(diào)節(jié)風(fēng)窗,風(fēng)窗位置距離入風(fēng)口 25m,風(fēng)流以0.51m/s的速度進(jìn)入巷道。經(jīng)過(guò)CFX軟件建模并解算分析后,由其自動(dòng)生成的速度場(chǎng)云圖與壓力場(chǎng)云圖可以得到增設(shè)調(diào)節(jié)風(fēng)窗后的巷道中,風(fēng)流速度以及溫度分布情況,接著提出增設(shè)調(diào)節(jié)風(fēng)窗巷道的穩(wěn)定風(fēng)流區(qū)域的可靠度概念與數(shù)學(xué)公式,并進(jìn)行了求解。
[Abstract]:Mine ventilation system is a large complex repairable system composed of ventilation network, main fan system and its supporting equipment. It has strong uncertainty and the subsystems are related to each other. It plays an important role in underground mining and the safety of underground personnel. The increase of mining scale and depth will make the network structure of ventilation system change dynamically, so the reliability of ventilation system will decrease, if any part of the system has a problem, As a result, normal mining cannot be carried out, and even the lives of workers are threatened. Therefore, the study of the reliability of ventilation systems is becoming more and more popular in mining enterprises. Based on the previous research results, combined with mine ventilation and reliability related theory technology, the network flow theory and other related knowledge and technical methods, as well as ANSYSCFX software simulation, are used in this paper. The reliability analysis method of ventilation network and main ventilator system is studied in detail. The main content is: 1. According to the inherent properties of ventilation network system, the reliability analysis model of wind path is established. Based on the air volume monitoring data of the branch wind path, the distribution law of the wind volume of the branch wind path is obtained by using the statistical fitting estimation method, and the concepts of the reliability and failure rate of the stroke road in the ventilation network are given, and the corresponding mathematical formulas are established. Based on the wind speed limit value of all kinds of roadway air volume and the wind speed experience value in the actual operation process of ventilation system, the reliability of each branch wind path is obtained according to the wind speed limit value of all kinds of tunnel air volume stipulated in the Safety regulations for Metal Non-metal Mines (hereinafter referred to as "Code"). It lays a foundation for further analysis of the reliability of ventilation network. The research on the reliability of ventilation network is based on the theory of network flow. The minimal path set of ventilation network is solved by means of the simplified adjacency endpoint method, and the algorithm is implemented by programming based on MATLAB. A simplified disjoint minimum path set algorithm is proposed: for the minimum path of any length m-1, Only by adding the inverse of the branch that does not appear in the minimum path, the disjoint result can be obtained directly, and the other minimal paths can be disintersected by BDD algorithm. The reliability of the ventilation network can be quantitatively analyzed by the above methods. Finally, the sensitivity of each branch is analyzed. The reliability of ventilation power is studied. The main fan is the power source of the ventilation system. If it fails, it will lead to the failure of the system. In this paper, Markov process theory is used to analyze the reliability of main fan, and the definition and mathematical expression of reliability index, such as reliability and failure rate, are given. Finally, the numerical simulation of reliability of ventilation roadway is carried out to verify the reliability. The distribution of air flow will change dynamically when the structure such as adjusting wind window is added to the tunnel. This paper uses ANSYSCFX software to model the model. In a 50.5m long roadway, an adjusting wind window is added. The position of the wind window is 25m from the air inlet, and the wind flow enters the roadway at a speed of 0.51m / s. After modeling and analyzing by CFX software, The velocity field cloud map and the pressure field cloud diagram generated by it automatically can obtain the wind velocity and temperature distribution in the roadway after adding the adjusting wind window. Then, the concept of reliability and mathematical formula of steady air flow area in the roadway with adjusting wind window are put forward and solved.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD724

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