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Heat exchanger device for components in crescent fan and heat exchange system

A technology for internal components and heat exchangers, applied in heat exchange equipment, indirect heat exchangers, heat transfer modification and other directions, can solve the problem of poor heat transfer effect of heat exchangers, large pressure drop of heat exchangers, The problem of small increase in pressure drop, etc., achieves the effect of benefiting recycling, small increase in pressure drop, and reduced thickness

Inactive Publication Date: 2020-04-14
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the present invention, the crescent inner member realizes automatic rotation under the action of exhaust flow velocity, this technology turns passive into active, effectively reduces the thickness of the thermal boundary layer without increasing the area of ​​the thermal boundary layer, and enhances the heat transfer performance, and The increase in the pressure drop of the heat exchanger is small, which can not only achieve the effect of actively enhancing heat transfer, but also save power costs, and solve the problem of poor heat transfer effect of the heat exchanger and large pressure drop of the heat exchanger in the prior art The problem

Method used

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  • Heat exchanger device for components in crescent fan and heat exchange system
  • Heat exchanger device for components in crescent fan and heat exchange system
  • Heat exchanger device for components in crescent fan and heat exchange system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0047] see Figure 1(a) to Figure 3 As shown, the present invention provides a crescent fan internal component heat exchanger device, including: tube box 1 , crescent fan internal component 8 , fixed shaft 3 , lower support plate 2 and upper support plate 4 .

[0048] The bottom of the pipe box 1 is provided with a cold fluid inlet 9, and the top is provided with a cold fluid outlet 5 and a cold fluid outlet thermometer 15; inside the pipe box 1, a lower support plate 2 is installed near the cold fluid inlet 9, near the cold fluid outlet The upper support plate 4 is installed at 5 places; the lower support plate 2 and the upper support plate 4 are provided with some air vents. The fixed shafts 3 of the internal components of several crescent fans are installed between the lower support plate 2 and the upper support plate 4; bearings 7 are installed on the fixed shafts 3, and the internal components 8 of the crescent fans are installed on the outer ends of the bearings 7; The ...

Embodiment 1

[0068] The internal component of the three-blade crescent fan is I, the internal component of the five-blade crescent fan is II, and the inclination angle of the blade is α. After CFD fluid mechanics software simulation, the vorticity of the two blades at different inclination angles is as follows: Figure 5 As shown, it can be seen from the figure that when the inclination angle reaches 15°, the maximum vorticity of the crescent fan is relatively 2400s -1 , which is relatively moderate. When the inclination angle reaches 21°, the vorticity increases significantly. The maximum vorticity of the internal components of the five-blade crescent fan is significantly smaller than that of the three-blade crescent fan, which improves the flow loss of gas and reduces the impact of airflow disturbance. Noise and vibration of the fan. Therefore, the internal component structure of the five-blade 15 ° inclined angle crescent fan is better, and the present invention adopts this structure as...

Embodiment 2

[0070] The cooling fluid in the tube is air, which is transported by the fan, enters the rotameter to measure the flow rate, and then enters the inner tube of the heat exchange tube with a flow rate of 50m 3 / h. A string of crescent fan internal component strings is installed in the pipe. The pipe gap is filled with steam, and the steam is produced by a steam generator. The internal components of the designed crescent fan can automatically rotate at high speed in the tube under the air drive. A comparative experiment was carried out on the above devices.

[0071] Group I is fixed and static 15 groups of five-bladed crescent fan internal components;

[0072] Group II is self-rotating 15 sets of five-bladed crescent fan internals;

[0073] Two sets of heat exchangers were used to collect experimental data, and the results of the two sets of experiments Figure 6(a) and 6(b) Shown:

[0074] Depend on Figure 6(a) and 6(b) It can be seen that the Nusselt number Nu of the ...

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Abstract

The invention discloses a heat exchanger device for components in a crescent fan and a heat exchange system. The heat exchanger device comprises a pipe box, wherein a cold fluid inlet is formed in thebottom end of the pipe box, and a cold fluid outlet is formed in the top of the pipe box; a lower supporting plate is mounted at the position, close to the cold fluid inlet, in the pipe box, and an upper supporting plate is mounted at the position, close to the cold fluid outlet, in the pipe box; a plurality of exhaust holes are formed in the lower supporting plate and the upper supporting plate;a plurality of fixing shafts are mounted between the lower supporting plate and the upper supporting plate; a plurality of components in the crescent fan are mounted on the fixing shafts through bearings; the components in the crescent fan can rotate relative to the fixing shafts through the bearings; and each component in the crescent fan comprises a plurality of blades which are uniformly arranged in the circumferential direction, and each blade is arranged to be crescent-shaped. According to the heat exchanger device, the components in the crescent fan are close to the inner wall of the pipe box but are not in contact with the inner wall, so that the area of a thermal boundary layer cannot be additionally increased; and the self-rotating turbulent flow inner components can automatically rotate without external power under the driving of air flow, so that the disturbance of fluid is increased, the thickness of the thermal boundary layer is effectively reduced, and the heat exchangeefficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of strengthening waste heat transfer process, and in particular relates to a heat exchanger device and a heat exchange system for an internal component of a crescent fan. Background technique [0002] China is a typical country rich in coal, poor in oil, and low in gas. At present, coal is the most important primary energy source in our country. In the process of coal conversion and utilization, medium and low temperature dry distillation technology has become the "leader" of coal classification and utilization. Low-temperature dry distillation of coal to obtain solid semi-coke, liquid coal tar and gaseous gas. The hot gas contains a lot of waste heat, and the calorific value can reach 33.5-37.7MJ / m 3 , At this stage, part of the gas is directly discharged, and part is recycled. To recycle and use liquid ammonia to cool down, waste water, electricity, liquid ammonia, etc., causing serious energy waste. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D21/00F28F13/02F28F13/06
CPCF28D21/00F28D2021/0019F28F13/02F28F13/06
Inventor 任国瑜任国瑞任佳乐马卫东曹增强任刘鹏杨杰吴小艳
Owner YULIN UNIV