天然ガスの希釈熱量調整方法及び装置

Method and apparatus for controlling dilution of calorific value of natural gas

Abstract

【課題】 小規模で運転費も少なくて済む天然ガスの希釈熱量調整方法及び装置を得る。 【解決手段】 払い出しラインを流れる気化前のLNGをBOGで希釈して天然ガスの熱量を目標熱量に調整する天然ガスの希釈熱量調整装置であって、BOGを再液化する再液化器29と、再液化されたBOGの圧力を希釈対象のLNG圧力以上に昇圧する液体ポンプ33と、気化前のLNGの熱量を測定する第1熱量計13と、前記再液化されたBOGの熱量を測定する第3熱量計39と、該第3熱量計39と前記第1熱量計13の測定結果に基づいて天然ガスの熱量を目標熱量にするためのBOG混合量を演算し、該演算結果に基づいて前記再液化されたBOGの混合流量を制御する熱量制御装置43と、を備えた。 【選択図】 図1
PROBLEM TO BE SOLVED: To provide a method and an apparatus for controlling dilution of the calorific value of natural gas which are small-scale and manage with reduced operation costs. SOLUTION: The apparatus for controlling dilution of the calorific value of natural gas by diluting an LNG flowing in a discharge line before gasification with BOG to adjust the calorific value of the natural gas to a target calorific value has a reliquefying device 29 for reliquefying BOG, a liquid pump 33 for raising the pressure of the reliquefied BOG to a pressure of not lower than the pressure of the target LNG for dilution, a first calorimeter 13 for measuring the calorific value of the LNG before gasification, a third calorimeter 39 for measuring the calorific value of the above reliquefied BOG, and a calorific value controlling apparatus 43 for calculating a mixing value of the BOG in order to make the calorific value of the natural gas to the target calorific value based on the measuring results of the third calorimeter 39 and the first calorimeter 13 and controlling a mixing flow rate of the above reliquefied BOG based on the calculation result. COPYRIGHT: (C)2006,JPO&NCIPI

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (4)

    Publication numberPublication dateAssigneeTitle
    JP-H03236588-AOctober 22, 1991Osaka Gas Co LtdMethod and device for processing boil-off gas of lng
    JP-H04370499-ADecember 22, 1992Tokyo Gas Co LtdTreatment method for vaporized gas generated in liquefied natural gas storage tank
    JP-H08178188-AJuly 12, 1996Tokyo Gas Co Ltd, 東京瓦斯株式会社Method and device for treating vaporized gas generated in liquefied natural gas storage tank
    JP-H1038199-AFebruary 13, 1998Ishikawajima Harima Heavy Ind Co Ltd, 石川島播磨重工業株式会社Low-temperature liquefied gas storing facility and operating method for it

NO-Patent Citations (0)

    Title

Cited By (7)

    Publication numberPublication dateAssigneeTitle
    JP-2010001355-AJanuary 07, 2010Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社System for controlling calorie of natural gas and method for controlling calorie
    JP-2013253651-ADecember 19, 2013Ihi Corp, 株式会社Ihi液化ガス払出設備
    JP-2015105739-AJune 08, 2015Jfeエンジニアリング株式会社, Jfe Engineering CorpCondensing mixing device and boil-off gas re-liquefying apparatus having the same
    JP-2015105810-AJune 08, 2015Jfeエンジニアリング株式会社, Jfe Engineering CorpCondensing mixing device and boil-off gas re-liquefying apparatus having the same
    JP-2016183781-AOctober 20, 2016Jfeエンジニアリング株式会社, Jfe Engineering Corp凝縮混合装置及びこれを有する蒸発ガス再液化装置
    WO-2016194049-A1December 08, 2016Jfeエンジニアリング株式会社Condensing and mixing device, condensing and mixing method, evaporated gas re-liquefaction device, and evaporated gas re-liquefaction method
    WO-2016194056-A1December 08, 2016Jfeエンジニアリング株式会社Condensing and mixing device and evaporated gas re-liquefaction device having same