Design and analysis of the thermal insulation system for a new independent type B LNG carrier

Niu, Wenlu; Li, G.L.; Ju, Yonglin; Fu, Yunzhun

doi:10.1016/j.oceaneng.2017.06.067

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…By the meaning of the mirror mapping technique which introduced in Section 2.2, the overall plant transfer function (i.e., equation (2)) is transformed into G ′ (s) (i.e., equation (3)). Taking no account of the pure time-delay term e − 0.25 s of G ′ (s), the 2 nd order closed-loop gain shaping algorithm is applied to G 1 (s).…”

Section: Controller Designmentioning

confidence: 99%

“…In a general way, LNG carriers are mainly divided into two types: Moss-type and membrane-type carrier. Currently, more than half the LNG carriers employ the membrane-type CCSs (cargo containment systems), which are further divided as NO 96 system and Mark III system as shown in Figure 1, both of which are developed by GTT (Gaztransport and Technigaz, France) [3]. e CCSs are composed of two different types of barriers, primary barrier and secondary barrier, to prevent heat transfer and LNG leakage.…”

Section: Introductionmentioning

confidence: 99%

“…ey investigated the strength and fatigue performance of the insulation system [2,4,5], cryogenic reliability of the insulation system [3,6,7], the structure design of the barriers [8,9], and so forth. However, owing to the business reasons, there was little literature related to the pressure maintenance system of CCSs' insulation containment space.…”

Section: Introductionmentioning

confidence: 99%

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Multitechnique Concise Robust Control for the Insulation Containment Space Pressure Control of LNG Carrier

Zhang

Han

2020

Mathematical Problems in Engineering

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In this note, a novel multitechnique concise robust control scheme, based on the mirror mapping technique (MMT), closed-loop gain shaping algorithm (CGSA), Smith predictor (SP), and nonlinear feedback technique (NFT), is proposed for the pressure control of the liquefied natural gas (LNG) carrier insulation containment space. Firstly, a kind of integral unstable time-delay model is obtained by linearizing the nonlinear model of the pressure maintenance system around its equilibrium. By using the MMT and CGSA, one acquires the corresponding stable mirror mapping model of the unstable linear model and the designed controller. And the SP is introduced to tackle the time-delay problem. In addition, for the purpose of energy saving, the NFT is added into the control scheme. Finally, a set of experiments has been employed to illustrate the control effects, and the results show that it can achieve satisfying performance in aspects of disturbance rejection and energy saving.

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Section: Controller Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multitechnique Concise Robust Control for the Insulation Containment Space Pressure Control of LNG Carrier

Zhang

Han

2020

Mathematical Problems in Engineering

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“…However, a CCS chain's carrier transport routes are relatively short because offshore CO 2 storage sites are widely distributed around the world and the probability of offshore storage sites being near capture sites is high. The temperature and pressure conditions of LNG carriers are usually −162 • C and atmospheric pressure, respectively [55], but the temperature and pressure conditions of CO 2 carriers range between the triple point of −56 • C and 5.1 bar and the critical point of 31 • C and 74 bar. Based on the results of this study, the differences in the transportation conditions between an LNG chain and a CCS chain lead to the following important differences in terminal design and operation:…”

Section: Comparison With Lng Terminalmentioning

confidence: 99%

Conceptualization of CO2 Terminal for Offshore CCS Using System Engineering Process

Noh¹,

Kang²,

Huh

et al. 2019

Energies

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In this study, the basic configuration and operation concept of a CO2 terminal were identified by conducting a system engineering process. The performance goal of a CO2 terminal was determined by requirement analysis. Then, functions and timelines were derived by functional analysis to meet the performance goal. Equipment to perform the functions were defined and finally, a process flow block diagram of the CO2 terminal was acquired. The CO2 terminal in this study consisted of three parts. First, the CO2 loading/unloading part is responsible for liquid CO2 unloading from the carrier and loading vapor CO2 onto the carrier. Secondly, the liquid CO2 transmission part extracts liquid CO2 from the storage tanks and increases the pressure until it satisfies the offshore pipeline transportation condition. The vapor-treatment part collects boil-off gas, generates vapor CO2, and charges the storage tanks with vapor CO2 to control the pressure of the storage tanks that discharge liquid CO2. Finally, the study results were compared with a liquefied natural gas (LNG) terminal. The biggest difference between the CO2 terminal in this study and the LNG terminal is that a vaporizer is essential in the CO2 terminal due to the smaller storage capacity of the CO2 terminal and, therefore, the lower amount of boil-off gas.

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“…LNG is stored in a cryogenic environment, and is cooled from room temperature to a cryogenic temperature. Owing to this wide temperature range, the LNG insulation system is under continuous contraction and expansion . In a wide temperature range, compression loads are applied by the difference of the material contraction and expansion rates.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

Son

Kim

Choi

et al. 2019

Macro Materials & Eng

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Polyurethane foams, which are among the most widely used insulating materials, are generally fabricated by the chemical reaction between isocyanate and polyol‐containing chemical additives and blowing agents. Recently, many kinds of blowing agents have been used for the fabrication process of polyurethane foam, such as hydrochlorofluorocarbons (HCFCs) and chlorofluorocarbons (CFCs). However, issues have continuously arisen regarding the destruction of the ozone layer due to these compounds. In the present study, polyurethane foams are manufactured using a mixture of water blowing agents and hydrofluorocarbons (HFC‐365mfc). These samples are subjected to mechanical tests to investigate the effects of the blowing agents on the mechanical properties of the polyurethane foam within a temperature range of 25 to −163 °C. In addition, thermal and microstructural investigations are conducted depending on the content of the HFC‐365mfc. From the scanning electron microscopy observations, the sizes of the structure cells and the windows are found to decrease with the increase in HFC‐365mfc content. In addition, from the Fourier transform‐infrared spectroscopy observations, the chemical bonds that affect mechanical performance are found to be more distributed with the increase in HFC‐365mfc content.

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Design and analysis of the thermal insulation system for a new independent type B LNG carrier

Cited by 24 publications

References 10 publications

Multitechnique Concise Robust Control for the Insulation Containment Space Pressure Control of LNG Carrier

Multitechnique Concise Robust Control for the Insulation Containment Space Pressure Control of LNG Carrier

Conceptualization of CO2 Terminal for Offshore CCS Using System Engineering Process

Synthesis of Polyurethane Foam Considering Mixture Blowing Agents for Application to Cryogenic Environments

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