Boil-off gas reliquefaction recovery system
A recovery system and evaporated gas technology, which is applied in the field of evaporated gas reliquefaction recovery system, can solve the problems of high energy consumption and complex structure, and achieve the effect of saving energy
Active Publication Date: 2019-08-27
挪威极地航运公司
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Problems solved by technology
[0002] Currently, liquefied natural gas bunkering ships with similar cargo loading basically use two liquefied natural gas C-type storage tanks, which are placed in two hull subdivision structures that are isolated from each other at the front and rear; and are equipped with a set of reliquefaction processing equipment and systems. The natural gas evaporated naturally in the cargo hold is processed to make it reliquefied and then flow back to the cargo hold; the existing reliquefaction treatment equipment uses a compressor to drive the refrigerant cycle to complete the liquefaction of the gas, but the structure of this reliquefaction treatment equipment is complex and can high consumption
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[0019] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and therefore are only examples, rather than limiting the protection scope of the present invention.
[0020] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.
[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" , "radial", "circumferential" and other indicated orientations or...
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The invention discloses a boil-off gas reliquefaction recovery system comprising a rack, and a primary cooling device and a secondary cooling device which are arranged in the rack and connected in series; the primary cooling device comprises a precooling exchanger of which a condensing agent inlet is connected with a liquid nitrogen storage tank through a propane cooler, and a condensing agent outlet of the precooling exchanger further communicates with a cargo tank; and the secondary cooling device comprises a condensing heat exchanger and a condensing separation tank, and boil-off gas is liquefied through the precooling exchanger, the condensing heat exchanger and the condensing separation tank, and flows back to the cargo tank. According to the above technical scheme, the boil-off gas reliquefaction recovery system has the beneficial effects that the stroke of the boil-off gas can be increased through the primary and secondary cooling devices, and the thorough liquefaction of the boil-off gas is ensured; in addition, liquid nitrogen is used as a cold source, and a compressor is not required; energy sources are saved, while the liquid nitrogen can be further used for sweeping thecargo tank after the liquid nitrogen absorbs heat and is converted into nitrogen gas; and it is ensured that the cargo tank is subjected to inerting treatment under the condition that gas storage isnot required.
Description
technical field [0001] The invention relates to the technical field of gas recovery, in particular to a vaporized gas reliquefaction recovery system. Background technique [0002] Currently, liquefied natural gas bunkering ships with similar cargo loading basically use two liquefied natural gas C-type storage tanks, which are placed in two hull subdivision structures that are isolated from each other at the front and rear; and are equipped with a set of reliquefaction processing equipment and systems. The natural gas evaporated naturally in the cargo hold is processed to make it reliquefied and then flow back to the cargo hold; the existing reliquefaction treatment equipment uses a compressor to drive the refrigerant cycle to complete the liquefaction of the gas, but the structure of this reliquefaction treatment equipment is complex and can High consumption. Contents of the invention [0003] Aiming at the defects in the prior art, the present invention provides an evapo...
Claims
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IPC IPC(8): F25J1/02
CPCF25J1/0025F25J1/0257F25J2210/60
Inventor 安德鲁斯.诺伯格巴德.诺伯格邬斯陆
Owner 挪威极地航运公司