發(fā)布時(shí)間：2018-02-21 07:32

  本文關(guān)鍵詞： 采暖 增強(qiáng)型地?zé)嵯到y(tǒng) 動(dòng)態(tài)特性　出處：《中原工學(xué)院》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：自21世紀(jì)以來(lái),我國(guó)經(jīng)濟(jì)快速增長(zhǎng),科研、技術(shù)等方面都取得翻天覆地的變化。但嚴(yán)重的生態(tài)環(huán)境污染已經(jīng)對(duì)我國(guó)經(jīng)濟(jì)的快速、健康發(fā)展產(chǎn)生嚴(yán)重制約,因此發(fā)展新型能源成為焦點(diǎn)。地?zé)崮芘c其他新型能源相比,除具有環(huán)保等共同特點(diǎn)外,還更加穩(wěn)定安全,可以被運(yùn)用在供暖行業(yè)。我國(guó)寒冷地區(qū)常用的供暖方法包括熱電聯(lián)產(chǎn)、鍋爐房供暖以及新型地源熱泵系統(tǒng)三種。但這些系統(tǒng)或多或少均會(huì)對(duì)環(huán)境造成一定的危害,所以研究新型地?zé)岵膳绞匠蔀橐环N發(fā)展的趨勢(shì)。本文中所研究的采暖用增強(qiáng)型地?zé)嵯到y(tǒng),是新型采暖方式的一種,其熱源是地下幾千米深的高溫巖石——干熱巖,整個(gè)換熱過(guò)程中僅存在著能量的交換,能夠避免更多的環(huán)境問(wèn)題。文章針對(duì)一對(duì)一(即一個(gè)注水井,一個(gè)生產(chǎn)井)干熱巖開(kāi)采物理模型,建立了系統(tǒng)的動(dòng)態(tài)模型,利用Gambit軟件和Fluent軟件對(duì)地下熱儲(chǔ)層在供暖周期內(nèi)的動(dòng)態(tài)進(jìn)行了數(shù)值模擬分析。模擬研究了85℃、100℃、115℃、130℃、145℃五種不同巖層溫度,2cm、1.6cm、1.4cm、1cm、0.8cm五種不同裂隙寬度,以及1cm/s、0.9cm/s、0.8cm/s、0.7cm/s和0.6cm/s五種不同水流速對(duì)增強(qiáng)型地?zé)嵯到y(tǒng)動(dòng)態(tài)特性的影響規(guī)律。通過(guò)分析五種不同巖層溫度、裂縫寬度以及水流速下的出水溫度、巖層溫度分布、監(jiān)測(cè)面流體溫度的變化規(guī)律以及巖層的供熱能力,確定了干熱巖開(kāi)發(fā)時(shí)巖層初始溫度、裂縫寬度以及水流速的基本原則,為制定干熱巖系統(tǒng)開(kāi)發(fā)方案奠定了基礎(chǔ)。通過(guò)對(duì)模擬結(jié)果的分析,可以知道:巖石初始溫度越高,裂縫之間的干擾距離越大,開(kāi)發(fā)方案中確定裂縫間距時(shí)可以選擇較大的距離;在裂隙寬度為2cm,水流速為1cm/s的情況下,巖石初始溫度為115℃時(shí),裂隙間距應(yīng)為9.5m,初始溫度為145℃時(shí),裂隙間距為10.2m。儲(chǔ)層內(nèi)裂隙寬度越小,巖層等溫線斜率越高,巖層內(nèi)溫度分布越不均勻,低溫區(qū)域越為集中,越不利于儲(chǔ)層在非采暖期內(nèi)熱量的恢復(fù),影響系統(tǒng)的使用年限,但生產(chǎn)井水溫降低時(shí)間延遲,且降低速度慢,兩井間最短距離減小,有利于節(jié)約投資成本,降低壓裂難度;在巖層初始溫度為115℃,流速為1cm/s的情況下,裂隙寬度為2cm時(shí),生產(chǎn)井溫度降低時(shí)間為150h,兩井間最短距離應(yīng)達(dá)到500m;裂隙寬度為1cm時(shí),生產(chǎn)井溫度降低時(shí)間為600h,兩井間最短距離應(yīng)達(dá)到250m。裂隙水流速度越大,巖層內(nèi)等溫線斜率越低,巖層溫度分布越均勻,越有利于儲(chǔ)層在非采暖期內(nèi)熱量的恢復(fù),但生產(chǎn)井水溫降低時(shí)間早,且降低速度快,兩井間最短距離增大,投資成本及技術(shù)難度增加;在巖層初始溫度為115℃,裂隙寬度為1.4cm的情況下,水流速為1cm/s時(shí),生產(chǎn)井水溫降低時(shí)間為300h,兩井間最短距應(yīng)達(dá)到350m;水流速度為0.8cm/s時(shí),生產(chǎn)井水溫降低時(shí)間為600h,兩井間最短距應(yīng)達(dá)到300m。對(duì)供熱能力而言,在人工熱儲(chǔ)體積相同的情況下,水流速度越慢、裂隙寬度越小時(shí),雖然生產(chǎn)井出水溫度越高,但滿足的供熱面積越小;巖石初始溫度為115℃,裂隙寬度為1.4cm,熱儲(chǔ)層體積為0.045km3時(shí),1cm/s和0.6cm/s的流速下,生產(chǎn)井出水溫度分別為:87℃、103℃,其供暖面積分別為:100萬(wàn)平方米、88萬(wàn)平方米。
[Abstract]:Since twenty-first Century, China's rapid economic growth, scientific research, have made changes in turn the world upside down technology. But the serious ecological environment pollution has on our economy fast, seriously restricting the healthy development, so the development of new energy has become the focus of geothermal energy. Compared with other new energy, environmental protection has the common characteristics. It is more stable and safe, can be used in the heating industry. China's cold area heating method includes cogeneration boiler room heating and new ground source heat pump system three. But these systems are more or less will cause certain harm to the environment, so the study of new heating geothermal has become a development trend of enhanced geothermal. System for heating in this paper, a new type of heating mode, the heat is several thousand meters deep underground hot rock, hot dry rock, the whole heat transfer process Only the existence of energy exchange, to avoid environmental problems. Aiming at the more one on one (that is a water injection wells, a production wells) hot dry rock mining model, the dynamic model of this system, the underground heat reservoir in the heating period of dynamic numerical simulation analysis was carried out using Gambit software and the Fluent software. The simulation of 85 C, 100 C, 115 C, 130 C, 145 C five different strata temperature, 2cm, 1.6cm, 1.4cm, 1cm, 0.8cm five different crack width, and 1cm/s, 0.9cm/s, 0.8cm/s, 0.7cm/s and 0.6cm/s five different water flow rate on the influence of enhanced dynamic characteristics geothermal system. Through the analysis of the five different temperature layers, water temperature and water flow rate of the crack width, rock temperature distribution, variation of surface temperature and monitoring fluid rock heating capacity, the development of hot dry rock strata to determine the initial temperature, crack width The basic principle and flow velocity, which laid the foundation for the development of hot dry rock system. Through the analysis of simulation results, we can know that the initial rock temperature is higher, the greater the interference distance between cracks, determine the crack spacing in the development program can choose a larger distance; in the crack width of 2cm, water flow rate for the case of 1cm/s, the initial temperature of rock is 115 degrees centigrade, fracture spacing should be 9.5m, the initial temperature is 145 degrees centigrade, fracture spacing of 10.2m. reservoir in the crack width is smaller, the higher the isotherm slope rock, rock temperature distribution is uneven, low temperature region is concentrated, is not conducive to reservoir in the non heating period of heat recovery, affect the service life, but the production of water temperature to reduce the time delay, and reduce the speed, the shortest distance between two wells decreases, can save the investment cost, reducing the pressure on the initial temperature of rock crack difficulty; 115 degrees C, flow rate is 1cm/s, the width of the crack is 2cm, producing wells temperature decrease time was 150h, the shortest distance between two wells should reach 500m; the fracture width is 1cm, the production wells temperature decrease time was 600H, the shortest distance between two wells should reach 250m. fissure water flow velocity is in the lower strata in the isotherm slope, rock temperature distribution is more uniform, more conducive to the reservoir in the non heating period of heat recovery, but the production of water temperature decreased early in time, and reduce the speed, the shortest distance between two wells increases, the cost of investment and technical difficulty; the initial temperature is 115 DEG C in rock and the fracture width is 1.4cm, the flow rate is 1cm/s, production wells water temperature reduction time is 300h, the distance between two wells should reach 350m; the flow rate is 0.8cm/s, production wells water temperature reduction time is 600H, the distance between two wells should reach 300m. of heating capacity, in person Heat storage under the condition of the same volume, the flow rate is slower, the width of the crack is smaller, although the production wells and water temperature is high, but to meet the heating area is smaller; the initial temperature of rock is 115 DEG C, crack width is 1.4cm, the heat reservoir volume is 0.045km3, 1cm/s and 0.6cm/s flow rate, temperature wells water production were: 87 degrees, 103 degrees, the heating area was 1 million square meters, 880 thousand square meters.

【學(xué)位授予單位】：中原工學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU832

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