Inclined flow tube shell type heat exchanger

A heat exchanger and flow tube technology, which is applied in the field of heat exchange equipment, can solve the problems that the heat exchange area cannot be fully utilized, it is difficult to reasonably adjust the temperature of the process medium, the large flow of the shell side and the heat transfer dead zone, etc., to eliminate the flow Dead zone, obvious disturbance effect, and improved shell-side heat transfer coefficient

Inactive Publication Date: 2007-06-27
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The arcuate baffle shell-and-tube heat exchanger widely used in engineering has a large flow and heat transfer dead zone on the shell side due to structural reasons, and the heat exchange area cannot be fully utilized; and the fluid flow resistance on the shell side is large, Especially when the flow rate of the shell-side fluid is high, not only is it easy to generate fluid-induced vibration, but also if the external power to the fluid is limited, it is difficult to reasonably adjust the temperature of the process medium to meet the needs of the process
The shell-side fluid flow rate of the spiral baffle shell-and-tube heat exchanger changes relatively smoothly, does not cause a large shell-side pressure loss, and can effectively eliminate dead zones and back-mixing phenomena, increasing the effective heat transfer area, but due to its It is difficult to manufacture and install, so it has not been widely used
The baffle rod shell-and-tube heat exchanger shows better heat transfer, fluid flow, anti-vibration and anti-scaling performance because it realizes the longitudinal flow of the shell-side fluid, but its heat transfer effect is not good under low Re conditions. The disadvantages of the best also limit its wide application

Method used

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  • Inclined flow tube shell type heat exchanger
  • Inclined flow tube shell type heat exchanger
  • Inclined flow tube shell type heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: As shown in Figure 1, Figure 2, Figure 5(a), and Figure 6, the oblique flow shell-and-tube heat exchanger mainly includes a baffle grid 1 and a heat exchange tube 2, and the baffle grid 1 is composed of a deflector Flow ring 11 and curtain baffles 12 welded on the baffle grille are formed. The curtain baffles 12 have semicircular openings 121, and there are protrusions 122 between two openings 121. The size of openings 121 is larger than The outer diameter of the heat exchange tube is 0.3 mm, the inclination angle between the curtain baffle 12 and the baffle ring 11 is 45°, and the curtain baffles 12 on any two adjacent baffle grids 1 are arranged orthogonally.

Embodiment 2

[0027] Embodiment 2: As shown in Fig. 3 and Fig. 5(b), the difference between this inclined flow shell-and-tube heat exchanger and Embodiment 1 is that: the curtain baffle 12 has a semicircular opening 121, and the semicircular An opening (123) is provided in the middle of the opposite protrusion 122 between the circular openings 121, the size of the opening 121 is 0.4mm larger than the outer diameter of the heat exchange tube 2, and the gap between the curtain baffle 12 and the baffle ring 11 The inclination angle is 30°, and the curtain baffles 12 on two adjacent baffles 1 are arranged symmetrically.

Embodiment 3

[0028] Embodiment 3: As shown in Fig. 4(a) and Fig. 5(c), the difference between the inclined flow shell-and-tube heat exchanger and Embodiment 1 is that the curtain baffle 12 has a square opening 121, The size of the square opening 121 is 0.45 mm larger than the outer diameter of the heat exchange tube 2, the inclination angle between the curtain baffle 12 and the baffle ring 11 is 60 °, and the curtain baffles on the two adjacent baffles 1 The flow sheets 12 are arranged in parallel.

[0029] Through the above technical scheme, the curtain baffles 12 on the adjacent baffles 1 can realize the complete support and positioning of the heat exchange tubes 2 in the horizontal and vertical positions, and at the same time, the curtain baffles 12 have a certain effect on the shell-side fluid. Strong guiding and disturbing effect, inclined flow passages are formed between two adjacent curtain baffles 12, the shell-side fluid flows into these inclined passages, and the flow direction o...

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Abstract

The heat exchanger includes baffle gratings and heat exchange tubes mainly. Baffle grating is composed of baffle rings and curtain type slant mounted baffle pieces (SMBP) welded on grating. There is semicircular, quadrate, or gearwheel shaped openings on curtain type baffle piece, and there are bulges between two openings. Size of the opening is 0.25-0.5mm larger than outer diameter of heat exchange tube. Angle of tilt between curtain type baffle piece and baffle ring is 15-75 degrees. SMBP increases mean flow rate and turbulent motion degree of shell side liquid in shell type heat exchanger with slant stream tubes, and related heat transfer coefficient of shell side liquid under lower coequal Re operating condition (OC); and SMBP intensifies thermal conduction, and eliminates flow dead zone so as to reduce pressure drop of shell side under higher Re OC. The invention is suitable to OC, where higher heat transfer coefficient is required, and applied power is limited.

Description

Technical field: [0001] The invention relates to a heat exchange device, in particular to a shell-and-tube heat exchanger with a small heat exchange dead zone and a large heat transfer area. Background technique: [0002] Heat exchanger is a general process equipment widely used in chemical industry, oil refining, power, food, light industry, atomic energy, pharmaceutical, aviation and many other industrial sectors. In chemical plants, the investment in heat exchangers accounts for about 10% to 20% of the total investment; in refineries, this investment accounts for about 35% to 40% of the total investment. The heat exchanger can not only reasonably adjust the temperature of the process medium to meet the needs of the process, but also an effective device for waste heat and waste heat recovery and utilization. Due to its reliable structure, mature technology, and wide application range, the shell-and-tube heat exchanger is currently the most commonly used structural form of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D1/053F28F13/02F28F9/24
CPCF28F9/22
Inventor 董其伍古新王珂刘敏珊周雅宁
Owner ZHENGZHOU UNIV
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