本文選題：內(nèi)置換料水箱 + 非能動(dòng)余熱排出熱交換器��； 參考：《華北電力大學(xué)(北京)》2017年博士論文

【摘要】：三代先進(jìn)壓水堆AP1000引入了非能動(dòng)余熱排出系統(tǒng)(PRHRs),內(nèi)置換料水箱(IRWST)是非能動(dòng)余熱排出系統(tǒng)的關(guān)鍵設(shè)備之一,非能動(dòng)余熱排出熱交換器(PRHR HX)、自動(dòng)降壓系統(tǒng)1-3級(jí)噴灑器(ADS sparger)均浸沒在內(nèi)置換料水箱中,事故工況下,非能動(dòng)余熱排出熱交換器、自動(dòng)降壓系統(tǒng)噴灑器等設(shè)備啟動(dòng),非能動(dòng)地將一回路余熱排出至二次側(cè)熱阱內(nèi)置換料水箱,為反應(yīng)堆提供應(yīng)急冷卻,其安全、高效運(yùn)行對(duì)于保證反應(yīng)堆事故余熱排出工況下,反應(yīng)堆有效降溫、降壓具有重要作用。本研究以AP1000為主要參考對(duì)象,搭建分離效應(yīng)整體縮比IRWSTPRHR HXADS實(shí)驗(yàn)臺(tái)架,研究反應(yīng)堆內(nèi)置換料水箱及其關(guān)鍵部件PRHR HX管壁加熱式傳熱、ADS高溫蒸汽噴放式冷凝過程中的熱工水力學(xué)特性,獲得IRWST內(nèi)整體三維溫度場、三維速度場分布及局部傳熱系數(shù),從而揭示關(guān)鍵進(jìn)程傳熱、傳質(zhì)機(jī)理,進(jìn)而把握內(nèi)置換料水箱內(nèi)流體整體、局部的傳熱、流動(dòng)特性。對(duì)于PRHR HX特殊形狀的C型管束傳熱研究,基于IRWSTPRHR HX分離效應(yīng)縮比實(shí)驗(yàn),分別對(duì)PRHR HX豎直段、上部水平段、下部水平段在單相自然對(duì)流階段、兩相沸騰階段傳熱特性進(jìn)行了深入分析,且基于實(shí)驗(yàn)數(shù)據(jù)驗(yàn)證了各類傳統(tǒng)半經(jīng)驗(yàn)傳熱關(guān)聯(lián)式對(duì)PRHR HX C型管束不同傳熱區(qū)域的適用性。另外,實(shí)驗(yàn)結(jié)果表明,在余熱排出進(jìn)程中PRHR HX持續(xù)加熱作用下,IRWST熱分層現(xiàn)象十分明顯,對(duì)應(yīng)熱分層數(shù)(Str數(shù))接近1。對(duì)此,本研究創(chuàng)新性地在PRHR HX二次側(cè)管束區(qū)新裝不同數(shù)量的導(dǎo)流板以減弱IRWST內(nèi)熱分層程度,并基于實(shí)驗(yàn)數(shù)據(jù)評(píng)價(jià)該新型導(dǎo)流板設(shè)計(jì)方案對(duì)IRWST對(duì)流傳熱特性、三維溫度速度分布,PRHR HX整體、局部傳熱效果的影響。實(shí)驗(yàn)結(jié)果表明,PRHR HX二次側(cè)新增導(dǎo)流板方案使得IRWST內(nèi)的熱分層程度降低30%以上,有利于內(nèi)置換料水箱在更長時(shí)間內(nèi)對(duì)反應(yīng)堆一回路進(jìn)行降溫、降壓,保證長期冷卻效果。對(duì)于AP1000自動(dòng)降壓系統(tǒng)噴灑器復(fù)雜結(jié)構(gòu)多孔噴放條件下的高溫高壓蒸汽直接接觸式冷凝(DCC)現(xiàn)象,本研究基于IRWSTADS噴灑器分離效應(yīng)縮比實(shí)驗(yàn),研究了內(nèi)置換料水箱內(nèi)整體循環(huán)特性、溫度分布以及自動(dòng)降壓系統(tǒng)蒸汽噴放條件下的傳熱特性。本研究創(chuàng)新性地采用噴放簡化“集總蒸汽冷凝區(qū)”模型,對(duì)復(fù)雜結(jié)構(gòu)、多噴孔條件下ADS原型縮比噴灑器噴放冷凝傳熱系數(shù)進(jìn)行評(píng)估計(jì)算,實(shí)驗(yàn)結(jié)果表明,在IRWST內(nèi)流體相對(duì)大過冷度條件下,蒸汽噴放傳熱系數(shù)范圍約為0.6-2.9 MW/(m2·℃)。另外,為減弱ADS噴灑器噴放條件下IRWST內(nèi)的熱分層現(xiàn)象,本研究創(chuàng)新地提出了ADS噴頭優(yōu)化方案,通過調(diào)整ADS噴灑器在IRWST內(nèi)的高度位置,改變IRWST內(nèi)整體流動(dòng)、溫度分布,并采用熱分層準(zhǔn)則數(shù)理查德森數(shù)(Ri數(shù))與熱分層數(shù)(Str數(shù))預(yù)測、評(píng)價(jià)IRWST內(nèi)的熱分層的形成條件、熱分層程度。實(shí)驗(yàn)結(jié)果表明,ADS噴頭位置優(yōu)化方案能夠有效降低IRWST內(nèi)的熱分層程度,有利于長期冷卻階段核電廠的長期、安全、穩(wěn)定運(yùn)行。本實(shí)驗(yàn)研究對(duì)AP1000內(nèi)置換料水箱熱工水力特性進(jìn)行了詳細(xì)、深入的研究,實(shí)驗(yàn)數(shù)據(jù)可為中國自主化堆芯、系統(tǒng)一體化分析軟件COSINE(Core and System INtegrated Engine for design and analysis)提供實(shí)驗(yàn)驗(yàn)證并進(jìn)行特殊傳熱模型評(píng)估,具有重要的應(yīng)用價(jià)值,實(shí)驗(yàn)數(shù)據(jù)為AP1000工程運(yùn)行與設(shè)計(jì)改進(jìn)提供了重要實(shí)驗(yàn)參考。
[Abstract]:The three generation advanced pressurized water reactor (AP1000) has introduced the non active waste heat discharge system (PRHRs), and the built-in feed water tank (IRWST) is one of the key equipment for the non active waste heat discharge system, the non active waste heat discharge heat exchanger (PRHR HX), the 1-3 level spraying device (ADS sparger) of the automatic step-down system are immersed in the built-in redeer tank, and the non dynamic surplus is in the accident condition. Heat discharge heat exchanger and automatic step-down system sprayer are started, and the residual heat of the one loop is discharged to the two side heat trap, which provides emergency cooling for the reactor. It is safe and efficient to reduce the temperature of the reactor effectively to ensure the discharge of the reactor's residual heat. This study is of great importance. AP1000 is the main reference object, and the IRWSTPRHR HXADS experimental platform is built with the separation effect as a whole, and the thermal hydraulic characteristics of the reactor's built-in feed water tank and its key components, PRHR HX tube wall heating, and the thermal hydraulic characteristics during the ADS high temperature steam ejection condensation process, are obtained. The three-dimensional temperature field of the whole body in IRWST, the distribution of the three-dimensional velocity field and the local transmission are obtained. Thermal coefficient, which reveals the heat transfer and mass transfer mechanism of the key process, and then grasps the fluid whole, local heat transfer and flow characteristics in the built-in feed water tank. For the PRHR HX special shape C tube bundle heat transfer, based on the IRWSTPRHR HX separation effect shrinkage experiment, the PRHR HX vertical section, the upper level section and the lower level section are in the single phase natural pair, respectively. In the flow stage, the heat transfer characteristics of the two-phase boiling stage are deeply analyzed. And based on the experimental data, the applicability of the traditional semi empirical heat transfer correlations for different heat transfer regions of the PRHR HX C tube bundle is verified. In addition, the experimental results show that the IRWST thermal stratification is very obvious in the process of residual heat discharge in the process of residual heat discharge, and the corresponding thermal stratification is very obvious. The number of thermal layers (Str number) is close to 1.. In this study, different number of diversion plates are newly installed in the PRHR HX two side tube bundle to reduce the degree of internal heat stratification in IRWST, and based on the experimental data, the effect of the new guide plate design scheme on the convection heat transfer characteristics of IRWST, the three-dimensional temperature velocity distribution, the whole PRHR HX and the local heat transfer effect are evaluated. The experimental results show that the PRHR HX two side new diversion plate scheme makes the degree of thermal stratification in the IRWST lower than 30%, which is beneficial to the cooling of the reactor first loop for a longer time, the depressurization, and the long-term cooling effect. The high temperature and high temperature of the complex structure of the AP1000 automatic depressurization system spraying device under the porous and porous condition The direct contact condensation (DCC) phenomenon of pressurized steam is studied. Based on the experiment of the separation effect of the IRWSTADS spray, the overall circulation characteristics, the temperature distribution and the heat transfer characteristics under the steam ejection condition of the automatic step-down system are studied. In complex structure, the heat transfer coefficient of ADS prototype shrinkage nozzle is evaluated and calculated under the condition of multiple injection holes. The experimental results show that the heat transfer coefficient range of steam ejection is about 0.6-2.9 MW/ (m2. C) under the condition of relatively large cooling degree in IRWST. In addition, this study is to weaken the thermal stratification phenomenon in IRWST under the spraying conditions of ADS sprinkler. The ADS nozzle optimization scheme was creatively proposed. By adjusting the high position of the ADS sprinkler in IRWST, the overall flow and temperature distribution in the IRWST were changed, and the thermal stratification criterion number (Ri number) and the thermal partition number (Str number) were used to predict the formation conditions of the thermal stratification in IRWST and the degree of thermal stratification. The experimental results showed that the nozzle position of ADS. The optimization scheme can effectively reduce the degree of thermal stratification in the IRWST, which is beneficial to the long-term, safe and stable operation of the nuclear power plant in the long-term cooling stage. The experimental research has carried out a detailed and in-depth study on the thermal hydraulic characteristics of the AP1000 built-in reding water tank. The experimental data can be used as a self main core in China and the system integration analysis software COSINE (Core an). D System INtegrated Engine for design and analysis) provides experimental verification and carries out special heat transfer model evaluation. It has important application value. Experimental data provide important experimental reference for the operation and design improvement of AP1000 engineering.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM623.91

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