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Preparation method and application of a high-pressure resistant external expansion spiral bellows enhanced heat transfer element

A spiral corrugated tube, heat transfer enhancement technology, applied in the direction of tubular elements, heat exchange equipment, lighting and heating equipment, etc., can solve the problem of reducing the flow area in the tube, increase heat and mass exchange, reduce flow resistance, wall thickness distribution Even curve effect

Active Publication Date: 2018-07-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing inner concave spiral bellows heat transfer element cannot meet the long-term stable operation under high-pressure fluid working conditions, and greatly reduce the circulation area in the pipe, and provide a high-pressure resistant external expansion spiral Preparation method and application of bellows enhanced heat transfer element

Method used

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  • Preparation method and application of a high-pressure resistant external expansion spiral bellows enhanced heat transfer element
  • Preparation method and application of a high-pressure resistant external expansion spiral bellows enhanced heat transfer element
  • Preparation method and application of a high-pressure resistant external expansion spiral bellows enhanced heat transfer element

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specific Embodiment approach 1

[0025] Specific implementation mode 1: This implementation mode is a preparation method of a high-pressure-resistant external expansion spiral bellows enhanced heat transfer element, which is completed according to the following steps:

[0026] The thick-walled light tube is hydraulically expanded in the mold, and the hydraulic expansion time is 45s, that is, the high-pressure external expansion spiral corrugated tube strengthens the heat transfer element; the mold clamping force increases step by step with time during the hydraulic expansion process. , let the time be t, the unit is s, the clamping force is F, the unit is kN, when 0≤t<10s, F=450t; when 10≤t<40s, F=500t / 3+8500 / 3; When 40≤t≤45s, F=9500; in the process of hydraulic expansion, the internal pressure increases step by step with time, let the time be T, the unit is s, the internal pressure is P, the unit is MPa, when 0≤T<10s , P=12T; when 10≤T<40s, P=6T+60; when 40≤T≤45s, P=300;

[0027] The enhanced heat transfer ...

specific Embodiment approach 2

[0029] Embodiment 2: The differences between this embodiment and Embodiment 1 are: the wall thickness of the thick-walled light pipe is 2mm, and the inner diameter of the pipe is 20mm. Others are the same as the first embodiment.

specific Embodiment approach 3

[0030] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the material of the thick-walled light pipe is 304 stainless steel. Others are the same as the first embodiment.

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Abstract

The invention discloses a preparation method and application of a high-pressure-resistance external expansion spiral corrugated pipe type enhanced heat transfer element, belongs to the technical field of engineering application of the heat transfer theory, and in particular, relates to a preparation method and application of a heat transfer element. The invention solves the problems of incapability of stably operating for a long time under the working condition of high-pressure fluid and large reduction of the in-pipe circulating area in a traditional indented spiral corrugated pipe type heat transfer element. The preparation method comprises the following steps: a thick-wall polish pipe is formed in a mold through hydraulic expansion; the mold closing force is gradually increased along with time in the hydraulic expansion process; and the internal pressure is gradually increased along with time in the hydraulic expansion process. The high-pressure-resistance external expansion spiral corrugated pipe type enhanced heat transfer element is a heat transfer element, and is applied to a tube-shell heat exchanger or a double-pipe heat exchanger. The high-pressure-resistance external expansion spiral corrugated pipe type enhanced heat transfer element, as the heat transfer element of the tube-shell heat exchanger, is applied to a nuclear gas-steam combined circulating system.

Description

technical field [0001] The invention belongs to the technical field of engineering application of heat transfer, and in particular relates to a preparation method and application of a heat transfer element. Background technique [0002] As a device for heat transfer and exchange, heat exchangers are widely used in energy, power, petroleum, chemical, metallurgy, light industry and other industries. It is not only an indispensable intermediate equipment in the process, but also an important equipment for developing secondary energy to realize waste heat recovery, energy saving and emission reduction. It is very important to develop safe and reliable enhanced heat transfer elements with high heat transfer performance to save metal consumption, investment and space of heat exchangers. [0003] The inner concave spiral bellows heat transfer element has been used abroad for many years as an enhanced heat transfer element in heat exchange equipment. Through stamping, rolling and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D15/10B21D53/06F28F1/06
CPCB21D15/10B21D53/06F28F1/06
Inventor 李炳熙王维张亚宁陈鑫
Owner HARBIN INST OF TECH
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