Compact LNG heat exchanger having transverse micro groove structure based on 3D printing
A 3D printing and micro-groove technology, applied in indirect heat exchangers, heat transfer modification, heat exchange equipment, etc., can solve problems such as high cost, increased flow resistance, and complex processing
Inactive Publication Date: 2020-09-11
708TH RES INST OF CSSC +1
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Problems solved by technology
[0011] The technical problem to be solved by the present invention is that the current LNG heat exchanger inner wall strengthening technology leads to increased flow resistance, complicated processing and high cost
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[0036] This example is a compact LNG heat exchanger with a transverse micro-groove structure based on 3D printing. It is processed by a conventional industrial 3D printer. The process is simple, the processing volume is small, and the cost is easy to control; the forced convection capacity is significantly increased. , while the flow resistance does not change much; it is easy to realize commercial products.
[0037] The basic structure of the LNG gasification heat exchanger is relatively simple, such as figure 1 Shown is the appearance of a typical small flow path LNG gasification compact heat exchanger, 1 is the shell welded by stainless steel plates, the heat exchanger shown in the figure adopts the form of cross flow, and the cold fluid-LNG fluid enters from the cold fluid inlet pipe 2 at the left end The horizontal direction passes through the internal core of the heat exchanger and flows out from the right end; hot fluid such as water enters from the hot fluid inlet pip...
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The invention discloses a compact LNG heat exchanger having a transverse micro groove structure based on 3D printing. Specifically, an efficient enhanced LNG gasification heat exchanger is manufactured through a 3D printing technology or additive manufacturing technology, the inner wall of a fine channel pipeline is subjected to special 3D printing treatment, and a plurality of arc-shaped micro groove sunken arrays arranged in the circumferential direction are formed on the inner wall surface so that the heat exchange feature of LNG supercutical fluid of a heat exchange pipeline can be improved. For a rectangular runner with the wall width being 1.0 mm, the dimension of the micro groove with the groove depth being 0.07 mm, the groove width being 0.23 mm and the groove interval being 0.4 mmis the most reasonable. The mass flow rate of LNG optimally arranged at an inlet of a single pipe is 1000 kg / m<2>s, when the inlet and outlet temperature of the LNG heat exchanger is 120-290 K, the pipeline average heat exchange coefficient can be increased to 45% or so, the enhancement effect is very remarkable, and meanwhile, the flow resistance is just increased by about 10%.
Description
technical field [0001] The invention relates to a compact LNG heat exchanger with a transverse micro-groove structure based on 3D printing, especially a high-efficiency enhanced compact LNG heat exchanger made by 3D printing technology or additive manufacturing technology. The inner wall of the small LNG flow heat exchange pipeline of the heat exchanger is specially 3D printed, and a series of circumferentially arranged microscopic 2-dimensional semi-arc grooves are formed on the four inner wall surfaces. The grooves are perpendicular to the flow direction to improve The invention relates to the heat exchange characteristics of LNG supercritical fluid in a heat exchange pipeline, and belongs to the fields of heat exchanger strengthening technology and low temperature heat exchange technology. Background technique [0002] With the increase of my country's demand for natural gas and the development of the liquefied natural gas (LNG, Liquefied Natural Gas) industry chain, offs...
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IPC IPC(8): F28D21/00F28F13/02F28F21/08
CPCF28D21/00F28D2021/0064F28F13/02F28F21/083F28F2255/00
Inventor 李福建李阳戴菁邵武豪刘振华王平阳张宇凡赵园
Owner 708TH RES INST OF CSSC