A plate heat exchanger slag discharging device
Patent Information
- Application Number
- CN202522299703.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-30
AI Technical Summary
当冲渣水进入板式换热设备与采暖水换热时，冲渣水会在板式换热设备中形成沉淀，造成换热设备堵塞，影响换热，造成经济损失
[0009]本实用新型的有益效果是：本实用新型通过PLC监控冲渣水出入口的压力差，进而了解板式换热器中沉积情况，在沉积达到一定程度（即压力差达到设定值），打开电动阀门，使沉积物通过排渣口排出板式换热器排渣设备外，进而使板式换热器继续正常使用，不影响换热。
Smart Images
Figure CN224802246U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchangers, and in particular to a heat exchanger for slag flushing water. Background Technology
[0002] A heat exchanger is an energy-saving device that enables heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters of the process to meet the requirements of the process conditions. It is also one of the main devices for improving energy utilization efficiency.
[0003] In the metallurgical industry, blast furnaces require a large amount of water to cool and granulate the molten mixture during iron smelting. This water then enters a bottom filter for filtration. The filtered water (flushing water) is pressurized by a flushing pump and then passes through a plate heat exchanger for heat extraction. However, due to incomplete filtration or failure to replace the filter media in a timely manner, the flushing water often contains a large number of fine particles. When this flushing water enters the plate heat exchanger and exchanges heat with heating water, it forms sediment, causing blockages, affecting heat exchange, and resulting in economic losses. Utility Model Content
[0004] The technical problem to be solved by this utility model is: how to ensure that the sediment in the plate heat exchanger used for flushing water is discharged in a timely manner to avoid affecting heat exchange.
[0005] The technical solution adopted in this utility model is: a plate heat exchanger slag discharge device, in which slag flushing water enters the plate heat exchanger from the slag flushing water inlet (1) and leaves the plate heat exchanger from the slag flushing water outlet (2), and heating water enters the plate heat exchanger from the heating water inlet (3) and leaves the plate heat exchanger from the heating water outlet (4). The plate heat exchanger contains two channels that are isolated from each other for heat exchange, namely the slag flushing water channel and the heating water channel. The heating water channel is a coil channel (11), and the slag flushing water channel is a main channel that is isolated by a partition (12) to make the slag flushing water flow in a turning direction. The coil channel (11) is located in the main channel. There are multiple slag discharge ports (10) at the bottom of the main channel. Each slag discharge port (10) is connected to the slag discharge pipe through a pipe with an electric valve. The slag flushing water inlet (1) is equipped with a first pressure gauge, and the slag flushing water outlet (2) is equipped with a second pressure gauge. The first pressure gauge, the second pressure gauge and all electric valves are connected to the PLC.
[0006] The main channel has a flushing water side drain port (6), a flushing water side exhaust port (7) and a pressure relief port (9) connected to the outside. The flushing water side drain port (6) is equipped with a flushing water side drain valve, the flushing water side exhaust port (7) is equipped with a flushing water side exhaust valve, and the pressure relief port (9) is equipped with a safety valve.
[0007] The coil channel (11) has a heating water side drain port (5) and a heating water side vent port (8) connected to the outside. The heating water side drain port (5) is equipped with a heating water side drain valve, and the heating water side vent port (8) is equipped with a heating water side vent valve.
[0008] The coil channel (11) includes multiple pipe networks connected sequentially from head to tail. Each pipe network is parallel to the partition (12). Each pipe network includes multiple parallel straight branch pipes (13) and two straight end pipes (14). Both ends of each straight branch pipe (13) are connected to the straight end pipes (14). The two straight end pipes (14) are the head end pipe and the tail end pipe. When two adjacent pipe networks are connected, the tail end pipe of the first pipe network is connected to the head end pipe of the next pipe network through the central pipe. The head end pipe of the first pipe network is connected to the heating water inlet (3), and the tail end pipe of the last pipe network is connected to the heating water outlet (4).
[0009] The beneficial effects of this utility model are: This utility model monitors the pressure difference between the inlet and outlet of the flushing water using a PLC, thereby understanding the deposition situation in the plate heat exchanger. When the deposition reaches a certain level (i.e., the pressure difference reaches the set value), the electric valve is opened, allowing the deposits to be discharged from the plate heat exchanger's slag discharge equipment through the slag discharge port, thus enabling the plate heat exchanger to continue to be used normally without affecting heat exchange. Attached Figure Description
[0010] Figure 1 This is a schematic front view of one embodiment of the present invention; Figure 2 This is a side view schematic diagram of an embodiment of the present invention (the slag discharge pipe is not shown). Figure 3 This is a top view schematic diagram of an embodiment of the present invention (the slag discharge pipe is not shown). Figure 4 This is a schematic diagram of two heat exchange channels that are isolated from each other, according to one embodiment of the present invention. Figure 5 This is a schematic diagram of a pipeline network according to an embodiment of the present invention; Among them, 1. Slag flushing water inlet, 2. Slag flushing water outlet, 3. Heating water inlet, 4. Heating water outlet, 5. Heating water side drain outlet, 6. Slag flushing water side drain outlet, 7. Slag flushing water side vent outlet, 8. Heating water side vent outlet, 9. Pressure relief outlet, 10. Slag discharge outlet, 11. Coil channel, 12. Baffle plate, 13. Straight branch pipe, 14. Straight end pipe. Detailed Implementation
[0011] The external structure of one embodiment of the plate heat exchanger slag removal device of this utility model is as follows: Figure 1-3 As shown.
[0012] A plate heat exchanger slag discharge device is provided, wherein slag flushing water enters the plate heat exchanger from slag flushing water inlet 1 and exits the plate heat exchanger from slag flushing water outlet 2, heating water enters the plate heat exchanger from heating water inlet 3 and exits the plate heat exchanger from heating water outlet 4, and the plate heat exchanger contains two isolated heat exchange channels, namely the slag flushing water channel and the heating water channel.
[0013] In the smelting industry, a large amount of water is used to cool and granulate the molten mixture. The cooling and granulation process generates a large amount of hot water at around 90 degrees Celsius (slag flushing water). After being filtered through a bottom filter, the slag flushing water and heating water exchange heat in a plate heat exchanger, effectively utilizing the heat carried by the slag flushing water and avoiding the waste of heat carried by the slag.
[0014] This utility model includes Figure 1-3 This is just one example of the appearance of a plate heat exchanger; there may be plate heat exchangers with different appearances than those in this utility model.
[0015] The heating water channel is a coil channel 11, and the slag flushing water channel is a main channel that is isolated by a partition 12 to facilitate the flow of slag flushing water. The coil channel 11 is located in the main channel. There are multiple slag discharge ports 10 at the bottom of the main channel. Each slag discharge port 10 is connected to a slag discharge pipe through a pipe with an electric valve. The slag flushing water inlet 1 is equipped with a first pressure gauge, and the slag flushing water outlet 2 is equipped with a second pressure gauge. The first pressure gauge, the second pressure gauge, and all electric valves are connected to the PLC for electrical signals.
[0016] In one embodiment, a control chip can be used instead of a PLC to complete the interlocking control of the first pressure gauge, the second pressure gauge, and all electric valves.
[0017] The main channel has a flushing water side drain port 6, a flushing water side vent port 7, and a pressure relief port 9 that connect to the outside. The flushing water side drain port 6 is equipped with a flushing water side drain valve, the flushing water side vent port 7 is equipped with a flushing water side vent valve, and the pressure relief port 9 is equipped with a safety valve.
[0018] Because this plate heat exchanger is relatively large, the liquid inside the equipment is drained through the flushing water side drain port during shutdown to prevent residual liquid from causing corrosion or scaling. Air is also vented through the flushing water side vent port to prevent air accumulation inside the chamber, which could affect heat exchange. The pressure relief port 9 is to prevent excessive internal pressure caused by flushing water buildup, which could damage the heat exchanger and lead to an accident. When the pressure reaches a set level, the safety valve opens and an alarm sounds. The safety valve can be electrically connected to a PLC.
[0019] The coil channel 11 has a heating water side drain port 5 and a heating water side vent port 8 connected to the outside. The heating water side drain port 5 is equipped with a heating water side drain valve, and the heating water side vent port 8 is equipped with a heating water side vent port valve.
[0020] The purpose of setting up the heating water side drain port 5 and the heating water side vent port 8 is to vent air during maintenance and initial operation (or when there is a lot of accumulated air).
[0021] like Figure 4-5 As shown, the coil channel 11 includes multiple pipe networks connected sequentially from head to tail. Each pipe network is parallel to the partition 12. Each pipe network includes multiple parallel straight branch pipes 13 and two straight end pipes 14. Both ends of each straight branch pipe 13 are connected to the straight end pipes 14. The two straight end pipes 14 are the head end pipe and the tail end pipe. When two adjacent pipe networks are connected, the tail end pipe of the first pipe network is connected to the head end pipe of the next pipe network through the central pipe. The head end pipe of the first pipe network is connected to the heating water inlet 3, and the tail end pipe of the last pipe network is connected to the heating water outlet 4.
[0022] In one embodiment, the plate heat exchanger body has an internal rectangular cavity measuring 2m x 2m x 1m. Two partitions, each measuring 2m x 1.5m x 1m, extend from the left side of the rectangular cavity to the right. Another partition, also measuring 2m x 1.5m x 1m, extends from the right side of the rectangular cavity to the left. These three partitions are evenly spaced within the plate heat exchanger body, dividing the cavity into four identical bends. A flushing water inlet is located at the front of the plate heat exchanger body, and a flushing water outlet is located at the rear. The flushing water enters the plate heat exchanger body and exits through these four bends. In one embodiment, the lower edges of the flushing water inlet and outlet are 10cm from the upper surface of the rectangular cavity.
Claims
1. A slag discharge device for a plate heat exchanger, wherein slag flushing water enters the plate heat exchanger from the slag flushing water inlet (1) and exits the plate heat exchanger from the slag flushing water outlet (2), and heating water enters the plate heat exchanger from the heating water inlet (3) and exits the plate heat exchanger from the heating water outlet (4), wherein the plate heat exchanger contains two isolated heat exchange channels, namely the slag flushing water channel and the heating water channel, wherein, The heating water channel is a coil channel (11), and the slag flushing water channel is a main channel that is isolated by a partition (12) to facilitate the flow of slag flushing water. The coil channel (11) is located in the main channel. The main channel has multiple slag discharge ports (10) at the bottom. Each slag discharge port (10) is connected to a slag discharge pipe through a pipe with an electric valve. The slag flushing water inlet (1) is equipped with a first pressure gauge, and the slag flushing water outlet (2) is equipped with a second pressure gauge. The first pressure gauge, the second pressure gauge, and all electric valves are connected to the PLC.
2. The slag removal device for a plate heat exchanger according to claim 1, characterized in that: The main channel has a flushing water side drain port (6), a flushing water side exhaust port (7) and a pressure relief port (9) connected to the outside. The flushing water side drain port (6) is equipped with a flushing water side drain valve, the flushing water side exhaust port (7) is equipped with a flushing water side exhaust valve, and the pressure relief port (9) is equipped with a safety valve.
3. The slag removal device for a plate heat exchanger according to claim 1, characterized in that: The coil channel (11) has a heating water side drain port (5) and a heating water side vent port (8) connected to the outside. The heating water side drain port (5) is equipped with a heating water side drain valve, and the heating water side vent port (8) is equipped with a heating water side vent valve.
4. The slag removal device for a plate heat exchanger according to claim 1, characterized in that: The coil channel (11) includes multiple pipe networks connected sequentially from head to tail. Each pipe network is parallel to the partition (12). Each pipe network includes multiple parallel straight branch pipes (13) and two straight end pipes (14). Both ends of each straight branch pipe (13) are connected to the straight end pipes (14). The two straight end pipes (14) are the head end pipe and the tail end pipe. When two adjacent pipe networks are connected, the tail end pipe of the first pipe network is connected to the head end pipe of the next pipe network through the central pipe. The head end pipe of the first pipe network is connected to the heating water inlet (3), and the tail end pipe of the last pipe network is connected to the heating water outlet (4).