Heat medium heat exchanger pressure relief structure
By introducing a buffer section and storage tank into the heat exchanger, the risk of shell expansion caused by high-pressure steam leakage and the problem of false alarms from pressure gauges are solved, achieving safe pressure relief and accurate monitoring, and ensuring stable operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAOXING KEQIAO HENGMING CHEMICAL FIBER CO LTD
- Filing Date
- 2025-10-30
- Publication Date
- 2026-07-31
AI Technical Summary
In existing high-pressure steam heat exchange processes, when high-pressure steam leaks, the mismatch in valve closing speed can lead to the risk of shell expansion, and false alarms from pressure gauges may cause unnecessary pressure relief structure rupture, indicating a lack of effective buffering and safety control.
Design a pressure relief structure for a heat exchanger, including a buffer section and a storage tank. The buffer section accommodates the expansion of the heat medium, avoiding damage to the shell caused by direct expansion, and multi-point temperature monitoring avoids false alarms.
It enables effective pressure relief in the event of high-pressure steam leakage, protects the casing, reduces false alarms, ensures continuous use of the equipment, and improves the accuracy of temperature monitoring.
Smart Images
Figure CN224580801U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of high-pressure steam heat exchange equipment, and specifically to a pressure relief structure for a heat medium heat exchanger. Background Technology
[0002] In existing high-pressure steam heat exchange processes, a shell and a high-pressure steam heat exchange coil are generally installed. One end of the high-pressure steam heat exchange coil is connected to an inlet pipe, and the other end is connected to an outlet pipe. One end of the shell is connected to an inlet heat medium pipe, and the other end is connected to an outlet heat medium pipe. High-pressure steam enters the high-pressure steam heat exchange coil through the inlet pipe, while the heat medium enters the shell through the inlet heat medium pipe. After heat exchange is completed, the heat medium is discharged through the outlet heat medium pipe, and the high-pressure steam is discharged through the outlet steam pipe.
[0003] During routine heat exchange, the possibility of high-pressure steam heat exchange coil rupture exists. Therefore, a pressure gauge is installed on the outlet heat medium pipe. When the high-pressure steam heat exchange coil ruptures, high-pressure steam leaks, and the pressure gauge senses this fluctuation, thereby controlling the valves on the outlet pipe, inlet pipe, inlet heat medium pipe, and outlet heat medium pipe to close simultaneously. During the closing process, because the high-pressure steam is at a high pressure (approximately 12 MPa), the valve stroke corresponding to its high pressure is long, and the closing speed is relatively slow. Conversely, the heat medium is at a low pressure relative to the high-pressure steam (approximately 7 MPa), and the valve stroke corresponding to its low pressure is short, resulting in a relatively fast closing speed. After the valves on the inlet and outlet heat medium pipes are completely closed, the inlet and outlet pipes still require a certain amount of time to close completely. At this point, the heat transfer medium stops flowing, while the high-pressure steam continues to flow for some time, causing the heat transfer medium inside the shell to continue exchanging heat. This causes the heat transfer medium to expand, and without a pressure relief structure, the shell will rupture, posing a danger. Therefore, a pressure relief structure with a pressure relief pipe and a rupture disc installed on it is necessary. Furthermore, pressure gauges can sometimes malfunction. For example, if only one rupture disc is installed, and the high-pressure steam heat exchange coil is not ruptured, but the pressure gauge shows a pressure change causing all four valves to close, the rupture disc will rupture due to the expansion of the heat transfer medium, and the heat transfer medium will be directly discharged through the pressure relief pipe. This is also undesirable. Therefore, a pressure relief structure for a heat exchanger with a buffer section is even more necessary. Utility Model Content
[0004] The present invention provides a pressure relief structure for a heat exchanger to solve the above-mentioned technical problems. This pressure relief structure can relieve pressure on the high-pressure steam heat exchange coil when it ruptures, and the pressure relief structure is also designed with a buffer section.
[0005] To solve the above-mentioned technical problems, the technical solution of the present invention for a pressure relief structure of a heat exchanger is as follows:
[0006] The device includes a shell; a high-pressure steam heat exchange coil is installed inside the shell; one end of the high-pressure steam heat exchange coil is connected to an inlet pipe, and the other end is connected to an outlet pipe; one end of the shell is connected to an inlet heat medium pipe, and the other end is connected to an outlet heat medium pipe; valves are installed on the outlet pipe, inlet pipe, inlet heat medium pipe, and outlet heat medium pipe; a pressure gauge is also installed on the outlet heat medium pipe; a pressure relief pipe is connected to the outside of the shell; a rupture disc A and a rupture disc B are connected to the pressure relief pipe; the section of the pressure relief pipe between rupture disc A and rupture disc B is a buffer section; and a storage tank is connected to the outer end of the pressure relief pipe.
[0007] The storage tank is connected to a vent pipe.
[0008] The length of the buffer section is 3 to 6 meters.
[0009] The buffer section is equipped with more than three temperature gauges.
[0010] Three temperature gauges are installed on the buffer section.
[0011] The technical effects that this utility model can achieve are:
[0012] 1. In the present invention, when the high-pressure steam heat exchanger coil ruptures and causes the heat medium to expand, both rupture disc A and rupture disc B will rupture, and the expanded heat medium and the leaked high-pressure steam will be discharged through the pressure relief pipe and the heat medium will be stored in the storage tank.
[0013] 2. When the high-pressure steam heat exchange coil is not ruptured, but all four valves are closed due to a pressure gauge error, let t1 be the time it takes for the valves on the inlet and outlet heat medium pipes to completely close, and t2 be the time it takes for the valves on the inlet and outlet air pipes to completely close. Since the time difference between t1 and t2 is limited, the expansion of the heat medium is also limited. By designing a buffer section, after the rupture disc A ruptures, the expansion of the heat medium is stored by the buffer section, so the rupture disc B will not rupture, thus ensuring that the device can be used again later.
[0014] 3. By installing three temperature gauges on the buffer section, and selecting two out of the three (i.e., removing values with large differences), the obtained temperature value is more accurate and false alarms are avoided. Attached Figure Description
[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0016] Figure 1 This is a schematic diagram of a pressure relief structure for a heat exchanger according to this utility model. Detailed Implementation
[0017] The present invention will now be described in further detail with reference to the accompanying drawings.
[0018] See Figure 1 .
[0019] A pressure relief structure for a heat exchanger includes a shell 1, inside which a high-pressure steam heat exchange coil 2 is installed; one end of the high-pressure steam heat exchange coil 2 is connected to an inlet pipe 3, and the other end is connected to an outlet pipe 4; one end of the shell 1 is connected to an inlet heat medium pipe 5, and the other end is connected to an outlet heat medium pipe 6; valves 7 are installed on the outlet pipe 4, the inlet pipe 3, the inlet heat medium pipe 5, and the outlet heat medium pipe 6, preferably all of which are electric valves; a pressure gauge 8 is also installed on the outlet heat medium pipe 6, and a pressure relief pipe is connected to the outside of the shell 1. 9; A rupture disc A10 and a rupture disc B11 are connected to the pressure relief pipe 9. The section of the pressure relief pipe 9 between the rupture discs A10 and B11 is a buffer section 12. The outer end of the pressure relief pipe 9 is connected to a storage tank 13. Specifically, the length of the buffer section 12 is 3 to 6 meters, preferably 5 meters. Three or more temperature gauges 22 are installed on the buffer section 12. More specifically, three temperature gauges 22 are installed on the buffer section 12. An vent pipe 21 is connected to the storage tank 13.
[0020] Instructions for use: When this utility model is in normal use, high-pressure steam is sent into the high-pressure steam heat exchange coil 2 through the air inlet pipe 3, and the heat medium enters the shell 1 through the heat medium inlet pipe 5. The high-pressure steam in the high-pressure steam heat exchange coil 2 exchanges heat with the heat medium in the shell 1. After the heat exchange is completed, the high-pressure steam after heat exchange is discharged through the air outlet pipe 4, and the heat medium after heat exchange is discharged through the heat medium outlet pipe 6.
[0021] When the high-pressure steam heat exchange coil 2 ruptures, causing high-pressure steam leakage, the pressure gauge 8 senses a pressure change and controls the valves 7 on the outlet pipe 4, inlet pipe 3, inlet heat medium pipe 5, and outlet heat medium pipe 6 to close. Let t1 be the time it takes for the valves 7 on the inlet heat medium pipe 5 and outlet heat medium pipe 6 to completely close, and t2 be the time it takes for the valves 7 on the inlet pipe 3 and outlet pipe 4 to completely close. Since there is a time difference between t1 and t2, the time for the high-pressure steam to close (i.e., t2) needs to be relatively longer. When the valves 7 on the inlet heat medium pipe 5 and outlet heat medium pipe 6 are completely closed, the high-pressure steam on the inlet pipe 3 and outlet pipe 4 is still flowing. At this time, the heat medium inside the shell 1 will expand due to heat. The expanded heat medium and the leaked high-pressure steam will directly break through the rupture discs A10 and B11 and be discharged through the pressure relief pipe 9. The heat medium will be collected in the storage tank 13.
[0022] When the high-pressure steam heat exchange coil 2 does not rupture, but the pressure gauge 8 false alarms, causing the valves 7 on the outlet pipe 4, inlet pipe 3, inlet heat medium pipe 5, and outlet heat medium pipe 6 to close, due to the time difference between t1 and t2, and the limited time difference between t1 and t2, although the high-pressure steam on the inlet pipe 3 and outlet pipe 4 is still flowing when the valves 7 on the inlet heat medium pipe 5 and outlet heat medium pipe 6 are completely closed, the flow time is limited. That is, the volume of the heat medium inside the shell 1 that expands due to heat is obviously also limited. After the expanded heat medium breaks through the rupture disc A10, it is protected by the designed buffer section 12. The device is designed to accommodate the expanded volume of the heat transfer medium, preventing the rupture disc B11 from rupturing and ensuring its continued usability. A temperature gauge 22 is designed on the buffer section 12 to measure its temperature. A significant temperature increase on the gauge indicates the presence of heat transfer medium within the buffer section 12, triggering an alarm. Furthermore, by designing three temperature gauges 22 and selecting two out of three (removing values with significant differences), the true condition of the buffer section 12 can be accurately determined, preventing false alarms.
Claims
1. A pressure relief structure for a heat exchanger, comprising a shell (1); a high-pressure steam heat exchange coil (2) is installed inside the shell (1); one end of the high-pressure steam heat exchange coil (2) is connected to an inlet pipe (3), and the other end is connected to an outlet pipe (4); one end of the shell (1) is connected to an inlet heat medium pipe (5), and the other end is connected to an outlet heat medium pipe (6); valves (7) are installed on the outlet pipe (4), the inlet pipe (3), the inlet heat medium pipe (5), and the outlet heat medium pipe (6); a pressure gauge (8) is also installed on the outlet heat medium pipe (6), characterized in that: The outer side of the housing (1) is also connected to a pressure relief pipe (9); the pressure relief pipe (9) is connected to a rupture disc A (10) and a rupture disc B (11); the section of the pressure relief pipe (9) between the rupture disc A (10) and the rupture disc B (11) is a buffer section (12); the outer end of the pressure relief pipe (9) is connected to a storage tank (13).
2. The pressure relief structure for a heat exchanger according to claim 1, characterized in that: The storage tank (13) is connected to a vent pipe (21).
3. The pressure relief structure for a heat exchanger according to claim 1, characterized in that: The length of the buffer section (12) is 3 to 6 meters.
4. The pressure relief structure for a heat exchanger according to claim 1, characterized in that: More than three thermometers (22) are installed on the buffer section (12).
5. The pressure relief structure for a heat exchanger according to claim 4, characterized in that: Three thermometers (22) are installed on the buffer section (12).