쉐도잉 연습: How does a Thermal power plant work? - 영상으로 영어 말하기 배우기
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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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이 레슨의 어휘와 말하기 포인트
이 C1 수준 말하기 레슨은 영상 “How does a Thermal power plant work?”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: steam, plant, turbine, pressure, temperature. 이 영상에는 섀도잉할 문장 59개와 단어 876개가 있습니다. 말하는 구간의 길이는 6:58입니다. 화자는 분당 약 126단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 77%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| turbine 명사 | /ˈtɜː.baɪn/ | 터빈 |
| boiler 명사 | /ˈbɔɪlɚ/ | 보일러 |
| pollutant 명사 | /pəˈl(j)uːtənt/ | 오염물질 |
| generator 명사 | /ˈdʒɛnəɹeɪtə(ɹ)/ | 발전기 |
| outlet 명사 | /ˈaʊtlɛt/ | 출구 |
| preheat 동사 | /pɹiːˈhiːt/ | 예열(豫熱)하다 |
| heater 명사 | /ˈhitɚ/ | 히터, 난방기 |
| withstand 동사 | /wɪðˈstænd/ | 맞서다, 버티다 |
| theorem 명사 | /ˈθiərəm/ | 정리 |
| rejection 명사 | /ɹɪˈd͡ʒɛkʃən/ | 거절 |
| particle 명사 | /ˈpɑɹtək(ə)l/ | 입자, 립자 |
| execute 동사 | /ˈɛksɪˌkjuːt/ | 처형하다 |
| voltage 명사 | /ˈvəʊltɪd͡ʒ/ | 전압 |
| threshold 명사 | /ˈθɹɛʃ(h)oʊld/ | 문턱, 문지방 |
| transform 동사 | /tɹænsˈfɔɹm/ | 변형시키다, 변형하다 |
이 영상의 문법
화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.
| 문형 | 영상 속 표현 |
|---|---|
| 수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점 | is added · is separated · can be fed |
| 현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때 | have met · have produced · has been converted |
주의할 발음
화자는 we'll, we've 같은 축약형과 약화된 형태를 3번 사용합니다. 들리는 대로 짧게 발음하세요.
- “th” 소리: thermal /ˈθɜːməl/, withstand /wɪðˈstænd/, theorem /ˈθiərəm/, threshold /ˈθɹɛʃ(h)oʊld/
- “sh”와 “zh” 소리: shaft /ˈʃɑːft/, rejection /ɹɪˈd͡ʒɛkʃən/, threshold /ˈθɹɛʃ(h)oʊld/
- 긴 단어 — 강세 위치에 주의: generator /ˈdʒɛnəɹeɪtə(ɹ)/, precipitator /pɹɪˈsɪpɪˌteɪtə(ɹ)/, atmospheric /ˌætməsˈfɛɹɪk/, consequently /ˈkɑnsɪˌkwɛntli/, considerably /kənˈsɪdəɹəbli/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: centrifugal /sɛnˈtɹɪf.(j)ə.ɡl̩/, conform /kənˈfɔɹm/, atmospheric /ˌætməsˈfɛɹɪk/, shaft /ˈʃɑːft/, transform /tɹænsˈfɔɹm/
- /v/ — ㅂ(/b/)과 구별하기: dissolve /dɪˈzɑlv/, revert /ɹɪˈvɝt/, derive /dɪˈɹaɪv/, voltage /ˈvəʊltɪd͡ʒ/, intensive /ɪnˈtɛnsɪv/
- /z/ — ㅈ이 아니라 성대를 울리는 /s/: dissolve /dɪˈzɑlv/, exhaust /ɪɡˈzɔst/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, turbine, boiler, pollutant 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.