發(fā)布時(shí)間：2018-01-12 04:04

  本文關(guān)鍵詞：一種長(zhǎng)壽命耐沖刷黑水角閥的研究　出處：《蘇州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 煤化工 黑水調(diào)節(jié)閥 計(jì)算流體動(dòng)力學(xué)

【摘要】：在煤化工行業(yè)的煤氣化工段中,對(duì)黑水的壓力、液位進(jìn)行精確調(diào)節(jié)的黑水調(diào)節(jié)閥,由于介質(zhì)中含有雜質(zhì)、溫度高、腐蝕性強(qiáng)、調(diào)節(jié)壓差大等特點(diǎn),普通的調(diào)節(jié)閥在很短的時(shí)間內(nèi)就會(huì)因?yàn)闆_蝕嚴(yán)重、泄漏量大、調(diào)節(jié)性能差而失效。即使目前一些閥門生產(chǎn)企業(yè)專門針對(duì)黑水工況開發(fā)的黑水調(diào)節(jié)閥,在使用3個(gè)月左右后,也會(huì)因?yàn)閮?nèi)件沖蝕嚴(yán)重而無(wú)法使用。黑水調(diào)節(jié)閥的頻繁更換,已嚴(yán)重影響了煤化工企業(yè)的正常生產(chǎn)。本文認(rèn)為導(dǎo)致閥門失效的根本原因在閥芯和閥座的節(jié)流部位流速過(guò)高,本課題對(duì)入口公稱通徑為3"(3inch),出口公稱通徑為4"(4inch),壓力等級(jí)為600LB的黑水調(diào)節(jié)角閥進(jìn)行建模(模型一),采用CFD流體分析軟件對(duì)不同開度下的流速和壓力進(jìn)行分析,然后通過(guò)對(duì)該模型進(jìn)行優(yōu)化,使得與模型一相比,新的結(jié)構(gòu)(模型二)在相同開度下流速大幅減小,從而達(dá)到了提高閥門耐沖刷性能,延長(zhǎng)閥門使用壽命的目的。本課題制造樣機(jī),對(duì)兩種結(jié)構(gòu)(模型一、模型二)進(jìn)行實(shí)際測(cè)試,并將測(cè)試結(jié)果和CFD分析結(jié)果進(jìn)行對(duì)比,以驗(yàn)證CFD分析的可靠性。本文主要做了以下4方面的工作:(1)分析了黑水調(diào)節(jié)角閥的使用工況和主要安裝工位,并對(duì)黑水介質(zhì)的性質(zhì)進(jìn)行討論,總結(jié)出了黑水調(diào)節(jié)角閥在使用中存在的問(wèn)題,以及黑水調(diào)節(jié)閥的發(fā)展現(xiàn)狀。(2)論述了數(shù)值模擬的基本理論和方法,介紹了常用的CFD模擬分析商業(yè)軟件,以及CFD軟件模擬的流程。本文還介紹了用于研究的模型一和模型二的二維圖紙和三維模型,以及從流體力學(xué)角度對(duì)模型進(jìn)行簡(jiǎn)化處理情況。(3)對(duì)模型一(常規(guī)結(jié)構(gòu))和模型二(優(yōu)化后的結(jié)構(gòu))從小開度、常規(guī)開度、大開度、全開四種情況下共十七個(gè)算例的速度場(chǎng)和壓力場(chǎng)進(jìn)行對(duì)比研究,確定模型二的優(yōu)點(diǎn)。(4)完成樣機(jī)的設(shè)計(jì)、制造,對(duì)安裝了模型一和模型二內(nèi)件的閥門進(jìn)行流量測(cè)試,通過(guò)實(shí)測(cè)結(jié)果和軟件模擬結(jié)果的比較,驗(yàn)證了軟件模擬的可靠性和準(zhǔn)確性。同時(shí),對(duì)軟件模擬值和實(shí)測(cè)值之間的差異進(jìn)行了詳細(xì)地分析。通過(guò)上述工作所研發(fā)的模型二的閥芯和閥座結(jié)構(gòu),同模型一結(jié)構(gòu)相比,大幅地降低了介質(zhì)通過(guò)閥門的流速,同時(shí)又確保閥門的流通能力沒(méi)有減小,有效地提高了閥門的使用壽命,滿足了生產(chǎn)需要,降低了維修維護(hù)成本。
[Abstract]:In the coal gasification section of coal chemical industry, the black water regulating valve which adjusts the pressure of black water and the level of liquid accurately, because of the impurity in the medium, the high temperature, the strong corrosiveness, the big adjustment pressure difference and so on. In a very short period of time, ordinary regulating valves will fail because of serious erosion, large leakage and poor regulating performance. Even though some valve manufacturers have developed black water regulating valves specially for black water conditions at present. After using for about 3 months, it will also be difficult to use because of the serious erosion of the inner parts. The frequent replacement of Blackwater regulating valve. It has seriously affected the normal production of coal chemical enterprises. This paper considers that the fundamental cause of valve failure is too high flow velocity in the throttling part of the valve core and seat, and the nominal diameter of the inlet is 3 "/ 3inch). The model of Blackwater regulating angle valve with nominal diameter of 4 "and pressure grade of 600LB is established (model 1). CFD fluid analysis software is used to analyze the velocity and pressure under different opening, and then the model is optimized to make it compare with model one. The new structure (Model 2) reduces the velocity of flow greatly under the same opening degree, thus achieving the purpose of improving the flushing resistance of the valve and prolonging the service life of the valve. Model 2) the actual test is carried out, and the test results are compared with the results of CFD analysis. In order to verify the reliability of CFD analysis. This paper mainly does the following four aspects of work: 1) analyzes the operation condition and main installation position of Blackwater regulating angle valve, and discusses the properties of black water medium. This paper summarizes the problems existing in the use of black water regulating angle valve, and the development status of black water regulating valve. It discusses the basic theory and method of numerical simulation, and introduces the commercial software of CFD simulation and analysis in common use. And the flow of CFD software simulation. This paper also introduces the two-dimensional drawings and three-dimensional models of model one and model two. And from the point of view of fluid mechanics to simplify the model. 3) to model one (conventional structure) and model two (optimized structure) small opening, conventional opening, large opening. In this paper, the velocity field and pressure field of 17 numerical examples are compared and studied, and the advantages of model 2 are determined. 4) the design and manufacture of the prototype are completed. The flow test of valves with model 1 and model 2 internals is carried out, and the reliability and accuracy of software simulation are verified by comparing the measured results with the results of software simulation. The differences between the simulated and measured values of the software are analyzed in detail. The spool and seat structure of model 2 developed by the above work is compared with that of model one. The velocity of medium passing through the valve is greatly reduced, while the flow capacity of the valve is not reduced, the service life of the valve is effectively increased, the production needs are met, and the maintenance and maintenance costs are reduced.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH134

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