Composite heat transfer pipe of heat exchanger for waste heat recovery
A waste heat recovery and heat exchanger technology, applied in the direction of heat exchanger shells, indirect heat exchangers, heat exchange equipment, etc., can solve the problems of limited disturbance capacity in the near-wall area, limited mixing capacity in the mainstream area, and low thermodynamic efficiency. Achieve the best heat transfer comprehensive performance, improve the heat transfer comprehensive performance, and the effect of strong flow field mixing ability
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[0040] Such as figure 1 As shown (note: in order to ensure the clarity of the drawings and show the structure of the components as much as possible, the scales of the different drawings below are different), a heat exchanger composite heat transfer tube 1 for waste heat recovery, Comprising a pipe body 11 and a plurality of multiple helical spoilers 12 fixed in the pipe body (such as image 3 shown); as figure 1 , 2 As shown, the pipe wall of the pipe body 1 is provided with a plurality of annular grooves 111 that are distributed along the axial direction of the pipe body at intervals and are recessed into the pipe body, such as Figure 4 As shown, a plurality of multiple helical spoilers 12 are distributed at intervals along the fluid flow direction in the pipe body 1 .
[0041] Wherein, the manufacturing method of the pipe body 11 is: an annular groove 111 is formed on the outer surface of the plain pipe by rolling, and the longitudinal section of the annular groove 111 c...
Embodiment 1
[0055] as attached figure 1 As shown, its specific parameters are:
[0056] The depth ratio of the annular groove 111 is H / D=0.034, the pitch ratio of two adjacent annular grooves 111 is P / D=1.103, and the width ratio of the annular groove 111 is T / D=0.172. In this embodiment Among them, the longitudinal section of the annular groove 111 is perpendicular to the axial direction of the pipe body. The number N of spiral spoiler elements 121 in each multiple spiral spoiler 12 is 2, and the spacing ratio between two adjacent multiple spiral spoilers 12 is S / D=18.103, and each multiple spiral spoiler 12 (or the length ratio L / D=10.345 of a single spiral spoiler element 121); the wire diameter ratio e / D=0.052 of a single spiral spoiler element 121, the width ratio W / D=0.379, and the pitch length ratio Y / D= 0.2.
[0057] The installation process is as follows: first, arrange two helical spoilers 121 in parallel, and fix them by spot welding to form multiple helical spoilers 12; Th...
Embodiment 2
[0060] as attached Figure 5 , Figure 6 As shown, the depth ratio of the annular groove 111 is H / D=0.034, the pitch ratio between two adjacent annular grooves 111 is P / D=1.103, and the width ratio of the annular groove T / D=0.172; each The number N of spiral spoiler elements 121 in the multiple spiral spoiler 12 is 3, and the spacing ratio between two adjacent multiple spiral spoilers 12 is S / D=3.879; the length of a single spiral spoiler element 121 Ratio L / D=10.345, wire diameter ratio e / D=0.052, width ratio W / D=0.379, pitch length ratio Y / D=0.2 (the mark position of above-mentioned parameter in embodiment two can refer to figure 1 ). In the range of Reynolds number 4000-16000, when used for gas heat exchange, compared with the traditional smooth tube, the maximum heat transfer rate of this embodiment is more than doubled. Its application method is with embodiment 1.
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