一种螺旋扁管及基于螺旋扁管的连续螺旋折流换热器
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI ZHUANGZHI PETROCHEM EQUIP
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-17
AI Technical Summary
Existing spiral flat tube heat exchangers are prone to coking in the middle, resulting in low production efficiency and difficulty in meeting the heat exchange requirements of high-viscosity fluids.
A spiral flat tube structure with an outer wall major axis length of 1.25-1.36 times the diameter of the circular tube section is adopted. Combined with a continuous annular spiral baffle structure, the gap of the spiral flat tube is optimized. Fixed end plates and plugs are used to seal the middle spiral flat tube to avoid the vortex effect in the middle.
It improves production efficiency, avoids coking in the middle, enhances heat exchange performance for high-viscosity fluids, and extends the maintenance and cleaning cycle of the equipment.
Smart Images
Figure CN224517497U_ABST
Abstract
Claims
1. A spiral flat tube structure, characterized in that: The system includes a spiral flat tube (1), which comprises an integral spiral flat tube segment (11) and circular tube segments (12) at both ends. The cross-section of the circular tube segment (12) is a perfect circle with an outer diameter of D. The spiral flat tube segment (11) is a spiral flat tube structure with an elliptical tube cross-section. The major axis of the outer wall of the elliptical tube is 1.25D-1.36D, and the minor axis of the outer wall of the elliptical tube is 0.52D-0.56D.
2. A spiral flat tube structure according to claim 1, characterized in that: The pitch of the spiral flat tube section (11) is 180mm-192mm, and the outer diameter D of the cross section of the circular tube section (12) is 19mm-25mm.
3. A continuous spiral baffle heat exchanger based on a spiral flat tube, characterized in that: The shell (4) of the heat exchanger adopts an annular continuous spiral baffle structure (3), on which multiple heat exchange tubes (2) are evenly distributed. Multiple parallel spiral flat tubes (1) are arranged in the annular middle part of the continuous spiral baffle structure (3), and the circular tube sections (12) at both ends of the spiral flat tubes (1) are fixed on the tube sheet (41).
4. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 3, characterized in that: The spiral flat tube (1) is the spiral flat tube structure as described in claim 1, and the center distance between the circular tube segments (12) of adjacent spiral flat tubes (1) is 1.25D-1.36D.
5. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 3, characterized in that: The heat exchanger is a single-pass heat exchanger. The two ends of the heat exchange tube (2) and the spiral flat tube (1) are respectively fixed on the tube sheets (41) at both ends of the shell (4). The two ends of the heat exchange tube (2) and the spiral flat tube (1) are respectively connected to the first tube box (5) and the second tube box (6). The first tube box (5) and the second tube box (6) are respectively sealed to the tube sheet (41) on their corresponding sides.
6. A continuous helical gasketed baffle heat exchanger based on spiral gasket as claimed in claim 3 wherein: The two ends of the spiral flat tube (1) are fixed to the tube sheet (41) by a fixed end plate (44). The two ends of the heat exchange tube (2) pass through the tube sheet (41) and are connected to the first tube box (5) and the second tube box (6) respectively. The first tube box (5) and the second tube box (6) are respectively sealed to the tube sheet (41) on their corresponding sides.
7. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 6, characterized in that: The circular tube segment (12) at the end of the spiral flat tube (1) is fixed in the fixing hole (45) on the fixing end plate (44). The end of the circular tube segment (12) is welded to the inner wall of the fixing hole (45) as a whole. A blocking plate (13) is welded on the inner wall of the end of the circular tube segment (12).
8. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 6 or 7, characterized in that: The heat exchanger is a two-pass heat exchanger. The second tube box (6) is disposed inside the shell (4). An annular flow gap is formed between the second tube box (6) and the shell (4). A first tube box partition (51) is disposed inside the first tube box (5). A tube inlet (7) and a tube outlet (8) are respectively disposed on the first tube box (5).
9. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 6 or 7, characterized in that: The heat exchanger is a multi-pass heat exchanger. The second tube box (6) is disposed inside the shell (4). An annular flow gap is formed between the second tube box (6) and the shell (4). A first tube box partition (51) is disposed inside the first tube box (5), and a second tube box partition (61) is disposed inside the second tube box (6). The first tube box partition (51) and the second tube box partition (61) are configured to form a multi-pass heat exchanger. A tube inlet (7) and a tube outlet (8) are respectively disposed on the first tube box (5).
10. A continuous spiral baffle heat exchanger based on a spiral flat tube according to claim 3, characterized in that: The heat exchange tube (2) is a smooth tube or a spiral corrugated tube; the spiral flat tube section (11) is a smooth spiral flat tube, a finned spiral flat tube, or a T-finned spiral flat tube.