跟讀練習: How does a Thermal power plant work? - 通過影片學習英語口語
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59 句
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Thermal power plants help meet almost half of the world's power demand.
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They use water as the working fluid.
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Today's thermal power plants are capable to run under great efficiency by conforming to stringent environmental standards.
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In this video, we will see how a coal -based thermal power plant achieves this in a detailed step -by -step manner.
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By turning the shaft of this generator, we will be able to generate electricity.
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The generator derives motion from a steam turbine, the heart of the power plant.
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In order to turn the steam turbine, you have to supply a high -pressure and high -temperature steam at the inlet of the turbine.
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As the turbine absorbs energy from the high -energy fluid, its pressure and temperature drop toward the outlet.
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You can take a closer look at the uniquely shaped steam turbine rotor blades.
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High -capacity power plants often use different stages of steam turbines, such as high -pressure turbine,
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intermediate -pressure turbine, and low -pressure turbines.
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So, now we have met our objective.
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We have produced electricity from the generator.
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If we can bring the low pressure and low temperature steam back to their original states, which were of a much higher pressure and temperature, we can repeat the process.
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The first step is to raise the pressure.
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You can use a compressor for this purpose.
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But compressing steam is a highly energy intensive process, and such a power plant will not be efficient at all.
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The easy way is to convert the steam into liquid and boost the pressure.
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For this purpose, we'll introduce condenser heat exchangers which sit beneath the low pressure turbine.
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In the condenser, a stream of cold water flows through the tubes.
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The steam rejects heat to this liquid stream and becomes condensed.
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Now we can use a pump to increase the pressure of this feed water.
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Typically, multistage centrifugal pumping is used for this purpose.
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That way, the pressure will revert to its original state.
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The next task is to bring the temperature back to its original value.
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For this purpose, heat is added to the exit of the pump with the help of a boiler.
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High -capacity power plants generally use a type of boiler called a water tube boiler.
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Pulverized coal is then burned inside the boiler.
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The incoming water initially passes through an economizer session.
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Here, the water will capture energy from the flue gas.
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The water flows through a downcomer, and then through water walls, where it transforms into steam.
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The pure steam is separated at a steam drum.
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Now, the working fluid is back to its original state, high pressure and high temperature.
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This steam can be fed back into the steam turbine,
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and the cycle can be repeated over and over again for continuous power production.
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But a power plant working on this basic Rankin cycle will have a very low efficiency and a low capacity.
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We can increase the performance of the power plant considerably with the help of a few simple techniques.
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In case of superheating, even after the liquid has been converted into steam, even more heat is added.
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And with that, the steam becomes superheated.
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The higher the temperature of the steam, the more efficient the cycle.
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Just remember the Carnot's theorem of maximal thermal efficiency possible.
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But the steam turbine material will not withstand temperatures of more than 600 degrees Celsius, so superheating is limited to that threshold.
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The temperature of the steam decreases as it flows along the rows of the blade.
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Consequently, a great way to increase the efficiency of the power plant is to add more heat after the first turbine stage.
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This is known as reheating and it will increase the temperature of the steam again, leading to a high power output and greater efficiency.
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The low pressure sides of the power plant are prone to suck the atmospheric air even with sophisticated sealing arrangements.
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The dissolved gases in the feed water will spoil the boiler material over time.
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To remove these dissolved gases an open feed water heater is introduced
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Hot steam from the turbine is mixed into the feed water steam bubbles so generated will absorb the dissolved gases
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The mixing also preheats the feed water which helps improve the efficiency of the power plant to an even greater extent
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All these techniques make the modern power plant work under an efficiency range of 40 to 45 percent
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Now we'll take a look at how heat addition and heat rejection are executed in an actual power plant.
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The cold liquid is supplied at the condenser with the help of a cooling tower.
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The heated up water from the condenser outlet is sprayed in the cooling tower, which induces a natural air draft and the sprayed water loses heat.
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This is how a colder liquid is always provided at the condenser inlet.
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At the heat addition side, the burning coal produces many pollutants.
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We cannot release these pollutants directly into the atmosphere, so before transferring them to a stack, the exhaust gas is cleaned in an electrostatic precipitator.
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The ESP uses plates with high voltage static electricity to absorb the pollutant particles.
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We hope that we've given you new insights into the inner workings of thermal power plants.
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本課的詞彙與口語要點
這節 C1 級別的口語課以影片“How does a Thermal power plant work?”為素材。 影片中反覆出現的詞有：steam, plant, turbine, pressure, temperature。 這段影片共有 59 個句子、876 個單詞可供跟讀。 講話部分時長為 6:58。 說話人語速平穩，每分鐘約 126 個詞，很適合跟讀。 只有 77% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。
影片中的重點詞彙
影片中最難的 15 個單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| turbine 名詞 | /ˈtɜː.baɪn/ | 渦輪機 /渦輪機, 輪機 /輪機 |
| condenser 名詞 | /ˈkʰəndɛnsɚ/ | 冷凝器, 凝結器 /凝結器 |
| boiler 名詞 | /ˈbɔɪlɚ/ | 鍋爐 /鍋爐 |
| dissolve 動詞 | /dɪˈzɑlv/ | 解散 |
| pollutant 名詞 | /pəˈl(j)uːtənt/ | 汙染物 |
| absorb 動詞 | /æbˈsɔɹb/ | 吸收 |
| generator 名詞 | /ˈdʒɛnəɹeɪtə(ɹ)/ | 發電機 /發電機 |
| outlet 名詞 | /ˈaʊtlɛt/ | 出口 |
| compress 動詞 | /ˈkɑmpɹɛs/ | 壓縮 /壓縮 |
| preheat 動詞 | /pɹiːˈhiːt/ | 預熱 /預熱 |
| reheat 動詞 | /ɹiːˈhiːt/ | 熱 /熱, 加熱 /加熱 |
| conform 動詞 | /kənˈfɔɹm/ | 遵從 |
| heater 名詞 | /ˈhitɚ/ | 加熱器 /加熱器, 暖氣 /暖氣 |
| withstand 動詞 | /wɪðˈstænd/ | 抵抗, 反抗 |
| theorem 名詞 | /ˈθiərəm/ | 定理 |
影片中出現的短語動詞
| 單詞 | 釋義 |
|---|---|
| heat up 動詞 | 加熱 /加熱 |
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is added · is then burned · is separated |
| 現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事 | have met · have produced · has been converted |
需要注意的發音
說話人用了 3 次縮略和弱讀形式，例如 we'll, we've。請按聽到的簡短形式來說。
- “th” 音: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, theorem /ˈθiərəm/, threshold /ˈθɹɛʃ(h)oʊld/
- “sh” 和 “zh” 音: shaft /ˈʃɑːft/, rejection /ɹɪˈd͡ʒɛkʃən/, threshold /ˈθɹɛʃ(h)oʊld/
- 長單詞——注意重音位置: generator /ˈdʒɛnəɹeɪtə(ɹ)/, precipitator /pɹɪˈsɪpɪˌteɪtə(ɹ)/, atmospheric /ˌætməsˈfɛɹɪk/, consequently /ˈkɑnsɪˌkwɛntli/, considerably /kənˈsɪdəɹəbli/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: dissolve /dɪˈzɑlv/, revert /ɹɪˈvɝt/, derive /dɪˈɹaɪv/, voltage /ˈvəʊltɪd͡ʒ/, intensive /ɪnˈtɛnsɪv/
- 詞尾子音 — 要讀清楚，後面不要加母音: dissolve /dɪˈzɑlv/, pollutant /pəˈl(j)uːtənt/, absorb /æbˈsɔɹb/, inlet /ˈɪnlət/, outlet /ˈaʊtlɛt/
- /r/ 和 /l/ 的區別: centrifugal /sɛnˈtɹɪf.(j)ə.ɡl̩/, particle /ˈpɑɹtək(ə)l/, considerably /kənˈsɪdəɹəbli/, threshold /ˈθɹɛʃ(h)oʊld/
如何用這段影片練習
- 先完整聽一遍影片，不要開口，記下不認識的單詞。
- 用正常速度逐句跟讀，每句重複到你的節奏與說話人一致為止。
- 錄下自己的聲音並與原聲對比，特別注意 turbine, condenser, boiler 這類單詞。
什麼是跟讀法？
跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。