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CN-115876022-B - Heat exchange core and LNG vaporizer

CN115876022BCN 115876022 BCN115876022 BCN 115876022BCN-115876022-B

Abstract

The invention provides a heat exchange core and an LNG vaporizer, which belong to the technical field of heat exchangers, wherein a first medium flow passage and a second medium flow passage are arranged in the heat exchange core, the first medium flow passage is used for conveying a medium to be heated, the second medium flow passage is used for conveying a heating medium, and the heating medium in the second medium flow passage and the medium to be heated in the first medium flow passage exchange heat through heat conduction. The second medium flow passage is provided with a first flow passage unit and a second flow passage unit which are arranged in a stacked manner, the first flow passage unit and the second flow passage unit are communicated, and heat exchange is carried out between the first flow passage unit and the second flow passage unit through heat conduction. And the heat transfer is realized in a heat conduction mode and a direct contact mode, so that the heat exchange efficiency is good, and the problem that the heating medium in the one-layer flow unit adjacent to the first medium flow channel is frozen is effectively avoided.

Inventors

  • ZHAO BO
  • ZHANG YIGUANG
  • WANG CHENGYAO
  • SHI JINGZHEN
  • Chi Weijia
  • SHEN WEILI
  • SHEN ZEQI

Assignees

  • 杭州沈氏节能科技股份有限公司

Dates

Publication Date
20260508
Application Date
20221125

Claims (8)

  1. 1.A heat exchange core, comprising: The first medium runner (1) is used for conveying a medium to be heated, and the medium to be heated is liquefied natural gas; The second medium flow passage (2) is used for conveying heating medium, the heating medium is antifreeze, and the heating medium in the second medium flow passage (2) and the medium to be heated in the first medium flow passage (1) exchange heat through heat conduction; The second medium flow channel (2) is provided with a first flow channel unit (21) and a second flow channel unit (22) which are arranged in a stacked manner, the first flow channel unit (21) and the second flow channel unit (22) are communicated in series, a radial superposition section which is at least partially superposed on a radial projection is arranged between the first flow channel unit (21) and the second flow channel unit (22), and the radial superposition sections are communicated through a plurality of through holes (321) so as to realize heat conduction and heat exchange between the first flow channel unit (21) and the second flow channel unit (22) and direct contact and heat exchange; The heating medium inlet and the heating medium outlet of the second medium flow channel (2) are arranged at the inlet position close to the first medium flow channel (1).
  2. 2. The heat exchange core according to claim 1, wherein the radially coinciding segments of the first flow channel unit (21) and the second flow channel unit (22) are parallel straight segments.
  3. 3. The heat exchange core according to claim 1, characterized in that radially coinciding segments of the first flow channel unit (21) and the second flow channel unit (22) coincide with a projection of at least a partial segment of the first medium flow channel (1) in radial direction.
  4. 4. A heat exchange core according to any one of claims 1-3, comprising a plurality of heat exchange plates (3) arranged in a stack, the first medium flow channels (1) and the second medium flow channels (2) being formed by the heat exchange plates (3), respectively.
  5. 5. Heat exchange core according to claim 4, characterized in that at least part of the heat exchange plates (3) are provided with channels on the plate surfaces, through which channels a first medium flow channel (1) for conveying the medium to be heated and/or a second medium flow channel (2) for conveying the heating medium are enclosed with the plate surfaces of the adjacent heat exchange plates (3).
  6. 6. The heat exchange core according to claim 5, wherein the depth of the channels is 1/5-2/3 of the thickness of the heat exchange plate (3), the thickness of the bottom wall of the removed channels of the heat exchange plate (3) is 0.1-0.5mm, and the width of the ribs between two adjacent channels on the same heat exchange plate (3) is 0.5-10mm.
  7. 7. Heat exchange core according to claim 4, characterized in that several heat exchange plates (3) are fixedly connected by means of diffusion welding.
  8. 8. An LNG vaporizer comprising the heat exchange core of any of claims 1-7.

Description

Heat exchange core and LNG vaporizer Technical Field The invention relates to the technical field of heat exchangers, in particular to a heat exchange core and an LNG vaporizer. Background Under the great background that environmental problems and energy problems are increasingly leading to the world economic development, natural gas is becoming more and more important as a clean and efficient energy source, and liquefied natural gas is abbreviated as LNG. Because lng has its unique physical properties (-162 ℃) in a storage state, it must be heated and vaporized to a high temperature to be used by other equipment, the heat source generally adopts an antifreeze solution such as ethylene glycol, and the heat of the antifreeze solution is transferred to lng by means of heat exchange, and the vaporizer is a key equipment in this heat exchange process. The vaporizer in the prior art is provided with a heat exchange core body which exchanges heat with the liquefied natural gas in a heat conduction mode after the anti-freezing liquid channels of the two layers of different media are connected in parallel, however, the heat exchange efficiency is lower because the two layers of different heating media exchange heat only in a heat conduction mode, and the problem that one layer of anti-freezing liquid channel close to the liquefied natural gas is frozen cannot be effectively avoided. Disclosure of Invention Therefore, the technical problem to be solved by the invention is that the heat exchange efficiency between the two layers of different heating mediums of the LNG vaporizer in the prior art is low, and the technical defect that the antifreeze solution is frozen cannot be effectively avoided. In order to solve the technical problems, the present invention provides a heat exchange core, including: A first medium flow passage for conveying a medium to be heated; The second medium flow passage is used for conveying heating medium, and the heating medium in the second medium flow passage exchanges heat with the medium to be heated in the first medium flow passage through heat conduction; The second medium flow passage is provided with a first flow passage unit and a second flow passage unit which are arranged in a stacked mode, the first flow passage unit is communicated with the second flow passage unit, and heat exchange is conducted between the first flow passage unit and the second flow passage unit through heat conduction. Optionally, the first channel unit and the second channel unit of the second medium channel are connected in series, and the heating medium inlet and the heating medium outlet of the second medium channel are both arranged at positions close to the inlet of the first medium channel. Optionally, a radial overlapping section which is at least partially overlapped on a radial projection is arranged between the first flow channel unit and the second flow channel unit, and the radial overlapping sections of the first flow channel unit and the second flow channel unit are communicated through a plurality of through holes. Optionally, the radially coincident sections of the first flow path unit and the second flow path unit are parallel straight line sections. Optionally, the radially coincident sections of the first and second flow path elements are coincident with a projection of at least a portion of the first media flow path in a radial direction. Optionally, the heat exchange plate comprises a plurality of heat exchange plates which are arranged in a stacked mode, and the first medium flow passage and the second medium flow passage respectively pass through the heat exchange plates to form the heat exchange plate. Optionally, at least part of the heat exchange plates are provided with channels, and a first medium flow channel for conveying the medium to be heated and/or a second medium flow channel for conveying the heating medium are formed by the channels and the adjacent heat exchange plates. By the arrangement, the volume of the core body is saved, the thickness of the heat exchange plate is reduced, the heat conduction distance is reduced, and the heat exchange efficiency is higher. Optionally, the depth of the channel is 1/5-2/3 of the thickness of the heat exchange plate, the thickness of the bottom wall of the channel removed by the heat exchange plate is 0.1-0.5mm, and the width of the rib between two adjacent channels on the same heat exchange plate is 0.5-10mm. The micro-channel structure is adopted, so that the volume is saved, and the micro-channel structure is suitable for environments with higher volume requirements. Optionally, the plurality of heat exchange plates are fixedly connected by diffusion welding. The core body is manufactured by adopting a vacuum diffusion welding mode, and the strength is high. The invention provides an LNG vaporizer, which comprises the heat exchange core body. The technical scheme of the invention has the following advantages: 1. According to the he