濱海電廠溫排水模型及其應(yīng)用研究
發(fā)布時(shí)間：2019-06-20 06:20
【摘要】：濱海燃煤電廠經(jīng)常配套卸煤碼頭，溫排水?dāng)U散、泥沙淤積和波浪防護(hù)是制約碼頭工程與取排水工程的運(yùn)營與維護(hù)的三大因素。溫排水?dāng)U散引起的取水溫度升高會(huì)降低機(jī)組的效率，甚至由于過度的熱回歸效應(yīng)而導(dǎo)致停機(jī)。環(huán)境的限制性要求是熱擴(kuò)散范圍和程度的另一指標(biāo)。溫排水?dāng)U散問題涉及到取排水平面布置、防波堤長度、取水型式與長度、排水型式與長度等，是工程的一個(gè)核心技術(shù)問題。 溫排水的模擬研究主要有物理模型和數(shù)學(xué)模擬兩種手段，與港口工程的其他研究一樣，兩種方法各有優(yōu)劣。數(shù)學(xué)模型基于流場的模擬，其二、三維模擬技術(shù)目前都比較成熟。對應(yīng)于實(shí)際應(yīng)用和自然條件，如何快速估算溫排水的影響和如何提高參數(shù)的精度是目前溫排水模擬比較缺乏的兩個(gè)方面。本文在列舉幾個(gè)實(shí)例的基礎(chǔ)上，結(jié)合共8個(gè)電廠的模擬對上述兩個(gè)方面進(jìn)行研究，主要研究成果如下： （1）數(shù)學(xué)模型工程應(yīng)用研究 系統(tǒng)介紹三種計(jì)算模式的二維溫排水?dāng)?shù)學(xué)模型，并分別引用工程實(shí)例進(jìn)行了闡述。 考慮溫度變化對流體密度的影響，建立了三維溫排水k紊流模型，，結(jié)合印尼吉利普多2×125MW_燃煤電廠的工程實(shí)例進(jìn)行闡述。 （2）物理模型工程應(yīng)用研究 結(jié)合汕頭市“上大壓小，改煤壓油”600MW_燃煤發(fā)電工程冷卻水工程，利用交通部天津水運(yùn)工程科學(xué)研究所海岸動(dòng)力及環(huán)境試驗(yàn)廳75×42m大型港池，對工程涉及的潮流溫升問題進(jìn)行了物理模擬。 （3）溫排水?dāng)U散規(guī)律研究與估算方法 考慮熱容量大小、潮流強(qiáng)弱與方向特征、波浪的大小與周期、水域開敞度與水深幾個(gè)主要因素對擴(kuò)散影響，以及熱量在上下邊界的自然耗散，推導(dǎo)熱擴(kuò)散快速計(jì)算方法，并用多個(gè)工程模擬實(shí)例進(jìn)行驗(yàn)證。
[Abstract]:Coastal coal-fired power plant is often equipped with coal unloading wharf, temperature drainage diffusion, sediment deposition and wave protection are the three major factors restricting the operation and maintenance of wharf engineering and drainage project. The increase of water intake temperature caused by warm drainage diffusion will reduce the efficiency of the unit, and even lead to shutdown due to excessive thermal regression effect. The restrictive requirements of the environment are another indicator of the scope and extent of thermal diffusion. The problem of warm drainage diffusion involves the layout of drainage plane, the length of breakwater, the type and length of water intake, the type and length of drainage, etc., which is a core technical problem in engineering. There are two main methods in the simulation of warm drainage: physical model and mathematical simulation. Like other studies in port engineering, the two methods have their own advantages and disadvantages. The mathematical model is based on the simulation of flow field. Second, the three-dimensional simulation technology is relatively mature at present. Corresponding to practical application and natural conditions, how to quickly estimate the influence of warm drainage and how to improve the accuracy of parameters are two aspects of the lack of warm drainage simulation at present. On the basis of enumerating several examples, this paper studies the above two aspects combined with the simulation of 8 power plants. The main research results are as follows: (1) the two-dimensional temperature drainage mathematical models of three calculation models are introduced by the mathematical model engineering application research system, and the engineering examples are cited to illustrate them respectively. Considering the influence of temperature change on fluid density, a three-dimensional thermal drainage k turbulence model is established, which is described with an engineering example of 2 脳 125MW _ coal-fired power plant in Jilipu, Indonesia. (2) the application research of physical model engineering combined with the cooling water project of 600MW _ coal-fired power generation project with "high pressure and small coal pressure" in Shantou City, using 75 脳 42m large port pool of coastal power and environmental test department of Tianjin Institute of Water Transportation Engineering Science of Ministry of Communications, the problem of tidal current temperature rise involved in the project is physically simulated. (3) the research and estimation method of thermal drainage diffusion law takes into account the effects of heat capacity, tidal current strength and direction, wave size and period, water openness and water depth on diffusion, as well as the natural dissipation of heat at the upper and lower boundaries. The rapid calculation method of thermal diffusion is deduced and verified by several engineering simulation examples.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621
本文編號(hào)：2503007
[Abstract]:Coastal coal-fired power plant is often equipped with coal unloading wharf, temperature drainage diffusion, sediment deposition and wave protection are the three major factors restricting the operation and maintenance of wharf engineering and drainage project. The increase of water intake temperature caused by warm drainage diffusion will reduce the efficiency of the unit, and even lead to shutdown due to excessive thermal regression effect. The restrictive requirements of the environment are another indicator of the scope and extent of thermal diffusion. The problem of warm drainage diffusion involves the layout of drainage plane, the length of breakwater, the type and length of water intake, the type and length of drainage, etc., which is a core technical problem in engineering. There are two main methods in the simulation of warm drainage: physical model and mathematical simulation. Like other studies in port engineering, the two methods have their own advantages and disadvantages. The mathematical model is based on the simulation of flow field. Second, the three-dimensional simulation technology is relatively mature at present. Corresponding to practical application and natural conditions, how to quickly estimate the influence of warm drainage and how to improve the accuracy of parameters are two aspects of the lack of warm drainage simulation at present. On the basis of enumerating several examples, this paper studies the above two aspects combined with the simulation of 8 power plants. The main research results are as follows: (1) the two-dimensional temperature drainage mathematical models of three calculation models are introduced by the mathematical model engineering application research system, and the engineering examples are cited to illustrate them respectively. Considering the influence of temperature change on fluid density, a three-dimensional thermal drainage k turbulence model is established, which is described with an engineering example of 2 脳 125MW _ coal-fired power plant in Jilipu, Indonesia. (2) the application research of physical model engineering combined with the cooling water project of 600MW _ coal-fired power generation project with "high pressure and small coal pressure" in Shantou City, using 75 脳 42m large port pool of coastal power and environmental test department of Tianjin Institute of Water Transportation Engineering Science of Ministry of Communications, the problem of tidal current temperature rise involved in the project is physically simulated. (3) the research and estimation method of thermal drainage diffusion law takes into account the effects of heat capacity, tidal current strength and direction, wave size and period, water openness and water depth on diffusion, as well as the natural dissipation of heat at the upper and lower boundaries. The rapid calculation method of thermal diffusion is deduced and verified by several engineering simulation examples.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM621
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