• Title/Summary/Keyword: 냉열에너지

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일본 LNG 냉열이용 동결냉장 또 냉동식품 사업현황 실태조사

  • 김정옥
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.29 no.7
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    • pp.28-35
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    • 2000
  • LNG 냉열 이용은 일본초저온(주)의 냉장보관 사업의 에너지절감 (65%)형 초저온 (-55$^{\circ}C$) 대형냉장고로 일본 뿐만 아니라 세계적으로 최초의 냉장업체이다. 회사 건설시는 입지선정, 경제성검토, 기술성, 공해상의 검토 등을 거쳐 완성된 업체로써 시설규모는 냉장 20,000 M/T, 1일 LNG 공급량 90M/T으로 현재 가동중이며 대부분의 동결 및 냉장 품목은 참치(마구로)가 83%를 차지하고 기타가 17% 였다. 냉장고의 가동율은 75%로 매우 높은 편이였다, LNG식 냉동장치의 가장 큰 장점은 일반적인 냉동방식 전력비의 1/3 밖에 소요되지 않는다는 것이다. L$N_2$의 내열이용 업체는 근기냉열(주)은 오사카의 천북에 있으며, L$N_2$를 자가 생산하여 면류 생산공장으로 직송하고 동결제조 하여 품질의 고급화 및 위생식품을 제조 판매하고 있다. 규모는 년간 2,000만식을 생산하고 주 생산제품은 조리면 및 냉동우동 등이다. L$N_2$의 소비가격은 전기식 냉동기에 비하여 5~9배의 고액이 소요되는 것이 결점이라고 할 수 있다.

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A Study on the Power Saving with the Use of LNG Cold Heat in a Cascade Refrigeration Cycle using Methane, Ethylene and Propylene as Refrigerants (메탄, 에틸렌 및 프로판 냉매를 활용한 다원 냉동 사이클에서 LNG 냉열을 활용한 동력 절감 방안에 대한 연구)

  • CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.3
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    • pp.302-306
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    • 2020
  • In this study, computer simulation works using PRO/II with PROVISION V10.2 have been performed for a cascade refrigeration cycle using methane, ethylene and propane as refrigerants. LNG cold heat was also utilized in order to save the compression powers for the ethylene and propane refrigeration cycles. It was concluded that about 77% of compression power can be saved by using LNG cold heat through the exchanging heat with refrigerants. We could also know that the cold heat price contained in 1 ton of LNG is 16,155 won.

A Study on the Utilization of the LNG Cold Heat for the Reduction of the Power Consumption in Main Air Compressors in Cryogenic Air Separation (심냉 공기분리공정의 공기압축공정에서 전력비 절감을 위한 액화천연가스 냉열 활용에 대한 연구)

  • CHO, DUHEE;CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.3
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    • pp.322-327
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    • 2020
  • In this work, a study for the reduction of the electric power consumption has been estimated in main air compressors in the air separation unit through cryogenic distillation columns with PRO/II with PROVISION V10.2 at AVEVA company. Both required LNG mass flow rate and cold heat contained in 1 ton of LNG were also predicted using Peng-Robinson equation of state with Twu's new alpha function. Through this work, we concluded that 32.33-48.69% of electric power could be saved by using LNG cold heat.

Estimation of the Ammonia Refrigeration Cycle Using LNG Cold Heat (액화천연가스 냉열을 활용한 암모니아 냉동 사이클의 추산)

  • NOH, SANGGYUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.29 no.4
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    • pp.357-362
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    • 2018
  • In this study, computer simulation and optimization works have been performed for a refrigeration cycle using ammonia as a refrigerant and also how much power was saved when the liquefied natural gas cold heat is replaced for the refrigeration cycle. PRO/II with PROVISION release 10.0 from Schneider electric company was used, and Peng-Robinson equation of the state model was selected for the modeling of the refrigeration cycle and LNG cold heat utilization process.

Estimation of the Amount of Electric Power Saved in the Carbon Dioxide Liquefaction Process using LNG Cold Heat (LNG 냉열을 활용한 이산화탄소 액화공정에서 절감되는 전력량의 산출)

  • LEE, JIHWAN;CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.2
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    • pp.259-264
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    • 2020
  • In this study, comparison study has been performed between two-stage compression and a vapor-recompression refrigeration cycle and a liquefaction using LNG cold heat. When using a first method using two-stage compression and a refrigeration cycle, at least three compressors are required, however when using LNG cold heat, no compressor is required since carbon dioxide can be pumped after condensing with the heat exchange with -160℃ of LNG. Through this study, we can save more than one hundred million KRW annually by using LNG cold heat instead of using gas compression and refrigeration cycle.

Comparative Study between Single-stage and Two-stage Expansion Using LNG Cold Heat (액화천연가스 냉열을 이용한 단일팽창과 이단팽창 사이의 비교 연구)

  • NOH, SANGGYUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.2
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    • pp.188-192
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    • 2019
  • Comparative studies between single- and two-stage expansion process using LNG cold heat have been performed for a closed Rankine power generation cycle. PRO/II with PROVISION release 10.0 from Schneider Electric Company was used, and the Peng-Robinson equation of state model with Twu's alpha function was selected for the modeling and optimization of the power generation cycle using LNG cold heat. In two-stage power generation cycle, 6.7% more power was obtained compared to that of single-stage power generation cycle through the optimization works.

A Study on the Price Evaluation Per 1 Ton of Liquefied Natural Gas According to the Refrigerants Supply Temperature in the Electric Refrigerator (전기식 냉동기에서 냉매의 공급온도에 따른 액화천연가스의 톤당 냉열 가격 산출에 대한 연구)

  • KIM, YONUNGWOO;PARK, ILSOO;CHO, JUNGHO
    • Transactions of the Korean hydrogen and new energy society
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    • v.30 no.5
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    • pp.473-477
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    • 2019
  • In this paper, cold heat price contained in the 1 ton/h of LNG has been evaluated using PRO/II with PROVISION release 10.2 from Aveva company when LNG is used to liquefy several refrigerants instead of using vapor recompression refrigeration cycle. Normal butane, R134a, NH3, R22, propane and propylene refrigerants were selected for the modeling of refrigeration cycle. It was concluded that LNG cold heat price was inversely proportional to the refrigerant supply temperature, even though LNG supply flow rate is not varied according to the refrigerant supply temperature.

Comparative Study on the Refrigeration Processes between Refrigeration Using Vapor Recompression and Refrigeration Using LN2 Cold Heat for the Carbon Dioxide Liquefaction (이산화탄소 액화를 위한 증기 재압축 냉동 공정과 액체질소 냉열을 이용한 냉동 공정의 비교 연구)

  • SANGGYUN NOH
    • Transactions of the Korean hydrogen and new energy society
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    • v.34 no.5
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    • pp.549-554
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    • 2023
  • In this paper, three kinds of studies have been completed to obtain highly purified carbon dioxide having more than 7N purity as an electronic grade quality. PRO/II with PROVISION release January 2023 from AVEVA company was used, and Peng-Robinson equation of the state model with Twu's alpha function was selected for the modeling of the cryogenic distillation process. When using LN2 cold heat, we can obtain highest recovery of carbon dioxide as a bottom product for a cryogenic distillation column.

Thermodynamic Analysis on the Feasibility of Turbo Expander Power Generation Using Natural Gas Waste Pressure (천연가스 폐압발전 활성화의 당위성에 대한 열역학적 분석)

  • Ha, Jong Man;Hong, Seongho;Kim, Kyung Chun
    • Journal of the Korean Institute of Gas
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    • v.16 no.6
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    • pp.136-142
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    • 2012
  • Thermodynamic equations for the electric power and temperature in a turbo expander generator (TEG) using pressure energy in a natural gas line are derived. From the equations, it was shown that dominant factor is not the pressure difference but the pressure ratio. The high energy level in the inlet of TEG can be made from nearly no expense of electric energy input, which means TEG can be treated as one of newly available clean energy source. If a post heating method is chosen to heat up expanded natural gas, the usage of cold energy is possible without a refrigeration cycle. The combined TEG and refrigeration system enhances economic benefit much more.