Plate heat exchanger unit with temperature and pressure reducing device

Abstract

This application discloses a plate heat exchanger unit with a desuperheating and pressure reducing device, relating to the field of heat exchanger unit technology. It includes a unit base frame, a plate heat exchanger for heat exchange mounted on one side of the top of the base frame, a desuperheating and pressure reducing device connected to the top of the plate heat exchanger, an electric regulating valve mounted on the top of the desuperheating and pressure reducing device, a Y-type filter extending from the end of the electric regulating valve away from the desuperheating and pressure reducing device, and a shut-off valve mounted from the end of the Y-type filter away from the electric regulating valve. Multiple circulating pumps are connected to one side of the bottom of the plate heat exchanger, and a secondary network return water pipe is connected to one end of the multiple circulating pumps away from the plate heat exchanger. Multiple makeup water pumps are connected to one side of the secondary network return water pipe. This application separates the flow inlet mode through the desuperheating and pressure reducing device, ensuring that the flow rate entering the plate heat exchanger unit remains within the normal temperature range, avoiding a high-temperature and high-pressure operating environment for the heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and in particular to a plate heat exchanger with a de-cooling and de-pressure device. Background Technology

[0002] Plate heat exchanger unit structure: It is a complete set of district heating control equipment that integrates plate heat exchanger, circulating pump, water supply pump, thermometer, pressure gauge, various sensors, pipelines, valves and industrial control. It is widely used in civil buildings such as factories, schools, and residential communities, and commercial buildings such as shopping malls, hotels and restaurants for heating, air conditioning, bathing water and domestic water.

[0003] Currently, the operating temperature of commonly used plate heat exchangers is limited by the temperature resistance of the gaskets, generally between -30℃ and 150℃. When the temperature reaches 180℃, although they can still work, the high temperature will accelerate the oxidation and corrosion of the materials, and the gaskets are prone to swelling, which will gradually reduce their performance and require frequent replacement. At the same time, the high pressure environment of the pipeline caused by high temperature will also subject the gaskets to compressive stress. Under long-term high pressure, the gaskets are prone to plastic deformation, thus losing their sealing ability. Utility Model Content

[0004] To address the issues of poor high-temperature resistance and frequent pipe replacement required in conventional plate heat exchanger units, as well as the tendency for pipes to deform and reduce sealing under high pressure, this application provides a plate heat exchanger unit with a de-heating and pressure-reducing device.

[0005] The plate heat exchanger unit with a desuperheating and pressure reducing device provided in this application adopts the following technical solution:

[0006] A plate heat exchanger unit with a desuperheating and pressure reducing device includes a unit base frame. A plate heat exchanger for exchanging heat is installed on one side of the top of the unit base frame. A desuperheating and pressure reducing device for regulating the temperature of the receiving flow of the plate heat exchanger is connected to one side of the top of the plate heat exchanger. An electric regulating valve for regulating the discharge flow is installed on one side of the top of the desuperheating and pressure reducing device. A Y-type filter for filtering gas and liquid impurities is installed at the end of the electric regulating valve away from the desuperheating and pressure reducing device. A shut-off valve for cutting off the gas and liquid flow is installed at the end of the Y-type filter away from the electric regulating valve.

[0007] The plate heat exchanger has multiple circulating pumps connected to one side of its bottom for circulating water supply. The ends of the multiple circulating pumps away from the plate heat exchanger are connected to a secondary pipeline return water pipe. The multiple circulating pumps are connected to multiple makeup water pumps on one side of the secondary pipeline return water pipe. All of the multiple makeup water pumps are connected to external fluid supply equipment.

[0008] By adopting the above technical solution, cold water is drawn into the output end of the circulating pump to form a cold water pipeline, which is then transported by the plate heat exchanger to the desuperheater and pressure reducer to exchange heat with the hot water, adjusting the hot water to a suitable temperature. At the same time, the hot water at the suitable temperature undergoes a secondary heat exchange with the cold water in the plate heat exchanger through the desuperheater and pressure reducer. Thus, the heat exchange process is set in the desuperheater and pressure reducer and the plate heat exchanger in stages, thereby reducing the heat directly received by the plate heat exchanger and avoiding the loss caused by excessive temperature in the plate heat exchanger. With the auxiliary replenishment of fluid by the water pump, the air pressure in the pipeline system is maintained at the temperature, preventing the pipeline from deforming.

[0009] Preferably, the desuperheating and pressure reducing device includes a gas-liquid inlet at the top of the desuperheating and pressure reducing device, and a primary pipeline steam inlet pipe is sealed at the opening of the gas-liquid inlet. The primary pipeline steam inlet pipe is connected and fixedly connected to an electric regulating valve, a Y-type filter and a shut-off valve respectively.

[0010] By adopting the above technical solution, a primary pipeline steam inlet pipe is set at the gas-liquid inlet, which facilitates the input of gas and liquid into the desuperheater and pressure reducer to exchange heat with cold water. Furthermore, the electric regulating valve, Y-type filter, and shut-off valve are all set in the primary pipeline steam inlet pipe, thereby regulating, filtering, and preventing backflow of the input gas and liquid.

[0011] Preferably, the desuperheater and pressure reducer has a liquid outlet on the surface near the gas-liquid inlet, and a secondary water supply pipe is sealed at the opening of the liquid outlet.

[0012] By adopting the above technical solution, the secondary pipeline water supply pipe is set at the liquid outlet. The secondary pipeline liquid, which is heated in the desuperheater and pressure reducer, flows out from the liquid outlet, and the liquid at a suitable temperature and pressure is supplied to the external network clients.

[0013] Preferably, the bottom of the desuperheating and pressure reducing device, away from the gas-liquid inlet, is connected to a primary inlet connecting pipe. The end of the primary inlet connecting pipe away from the desuperheating and pressure reducing device is connected to the interior through the inlet at the top of the plate heat exchanger. A primary network condensate pipe is connected to the output port at the bottom of the plate heat exchanger, and a drain valve is fixed on the surface of the primary network condensate pipe.

[0014] By adopting the above technical solution, the primary inlet connecting pipe connects the desuperheating and pressure reducing device and the plate heat exchanger, so that the hot water that has undergone the first heat exchange in the desuperheating and pressure reducing device enters the plate heat exchanger through the primary inlet connecting pipe and forms a second heat exchange with the cold water pipeline. At the same time, the steam trap installed on the surface of the condensate pipe of the primary pipeline is used to block the gas in the fluid and prevent too many air bubbles from being mixed in when the fluid is discharged.

[0015] Preferably, the desuperheater and pressure reducer is provided with a secondary outlet connecting pipe on the side surface of one end of the primary inlet connecting pipe, and the end of the secondary outlet connecting pipe away from the desuperheater and pressure reducer is connected to the top inlet of the plate heat exchanger.

[0016] By adopting the above technical solution, the secondary outlet connecting pipe connects the cold medium flow channel inside the desuperheater and the plate heat exchanger, thereby sequentially transporting the cold medium to the plate heat exchanger and the desuperheater, thus forming a situation where the cold medium in the plate heat exchanger and the desuperheater exchanges heat with the hot medium flow channel respectively.

[0017] Preferably, the pipe connections of the plurality of circulating pumps near the plate heat exchanger are all sealed with flexible connections.

[0018] By adopting the above technical solution, the flexible connector, as the connecting part between the circulating pump and the plate heat exchanger, receives the impact of the fluid when receiving the fluid transported by the circulating pump, and deforms to absorb the vibration force. At the same time, its own deformation is flexible, preventing the phenomenon of fluid leakage due to poor flange connection caused by thermal expansion of the pipeline.

[0019] Preferably, each of the plurality of flexible connections is fixed with a check valve on the side near the plate heat exchanger to prevent fluid backflow.

[0020] By adopting the above technical solution, the check valve is installed on one side of the flexible connection. When the fluid flows through the plate heat exchanger from the flexible connection, the check valve automatically opens and closes through its own valve core to ensure that the fluid can only flow in one direction.

[0021] Preferably, each of the plurality of check valves is fixed with a butterfly valve for controlling the opening and closing of the fluid flow path on the side near the plate heat exchanger.

[0022] By adopting the above technical solution, personnel can manually control the opening and closing of the fluid extraction channel of the circulating pump by turning the butterfly valve handle.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By using the desuperheating and pressure reducing device installed on the top of the plate heat exchanger, the hot and cold water heat exchange work is carried out in stages, thereby confining the high-temperature generation structure within the desuperheating and pressure reducing device. This controls the fluid flowing into the plate heat exchanger for heat exchange to remain within the normal temperature range, avoiding the plate heat exchanger from being subjected to excessively high temperatures, which would lead to a decline in material performance. At the same time, temperature adjustment prevents the gaskets from deforming due to excessively high internal air pressure in the plate heat exchanger. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the plate heat exchanger of this application;

[0026] Figure 2 This is a schematic diagram of the fluid flow of the plate heat exchanger in this application;

[0027] Figure 3 This is a simplified schematic diagram of the desuperheater and pressure reducer port of this application.

[0028] Attached reference numerals: 1. Electric regulating valve; 2. Y-type filter; 3. Shut-off valve;

[0029] 4. Desuperheater and pressure reducer; 41. Steam inlet pipe of primary pipeline; 42. Secondary outlet connection pipe; 43. Primary inlet connection pipe; 44. Condensate pipe of primary pipeline; 45. Return water pipe of secondary pipeline; 46. Water supply pipe of secondary pipeline; 47. Liquid outlet; 48. Gas-liquid inlet;

[0030] 5. Plate heat exchanger; 6. Steam trap; 7. Unit base frame; 8. Butterfly valve; 9. Check valve; 10. Flexible connection; 11. Circulating pump; 12. Make-up water pump. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0032] This application discloses a plate heat exchanger unit with a de-cooling and de-pressure reducing device.

[0033] Reference Figure 1 , Figure 2 , Figure 3 A plate heat exchanger unit with a de-heating and de-pressure device includes a unit base frame 7. A plate heat exchanger 5 is screwed to one side of the upper end face of the unit base frame 7. Multiple plates for heat exchange are arranged and fixed inside the plate heat exchanger 5. A first pipe is sealed to the inlet of the bottom side of the plate heat exchanger 5 by a flange. The end of the first pipe away from the plate heat exchanger 5 extends along the surface of the unit base frame 7 and branches into multiple branch pipes at the end of the extension. A circulating pump 11 is screwed to the surface of the unit base frame 7 at the end of each branch pipe (the number of circulating pumps 11 is adjusted according to the actual flow rate and head supply requirements).

[0034] Furthermore, the output ends of multiple circulating pumps 11 are respectively sealed and connected to the branch pipes of multiple first pipes. The receiving ends of multiple circulating pumps 11 are sealed and connected to second pipes. The end of the second pipe away from the circulating pumps 11 is sealed and connected to a secondary pipe network return pipe 45. The secondary pipe network return pipe 45 is connected to an external cold water supply device. A pipe branch extends from one side of the middle of the second pipe surface. A makeup water pump 12 is screwed and fixed to the end of the pipe branch on the surface of the unit base frame 7. The output end of the makeup water pump 12 is sealed and connected to the pipe branch. The receiving end of the makeup water pump 12 is connected to an external water supply device. Thus, when the water temperature in the pipeline is too high or the water pressure is too low, the external cold flow is output from the second pipe to the circulating pumps 11 to assist in water replenishment to the system.

[0035] It should be noted that multiple first pipe surfaces are sequentially fixed with flexible connections 10, check valves 9, and butterfly valves 8 in the direction from the circulating pump 11 towards the plate heat exchanger 5. First, the flexible connection 10 receives the water flow drawn in by the circulating pump 11. During the deformation caused by the water flow impact, the flexible connection 10 absorbs and disperses the vibration force generated by the water flow impact, thus forming a buffering effect. Then, the check valve 9 comes into contact with the water flow. The water flow enters the check valve 9 and continues to flow in after the valve core is opened. However, when the water flow causes backflow, the impact valve core moves and closes the check valve 9, thereby preventing the water flow from backflowing. Personnel can manually adjust the opening and closing of the pipeline by turning the rotating valve stem of the butterfly valve 8 according to the air pressure in the pipeline system.

[0036] Reference Figure 1 , Figure 2 , Figure 3 A desuperheating and pressure reducing device 4 is installed on one side above the plate heat exchanger 5. It is made of seamless steel pipe, with a temperature resistance limit of 350℃ and a pressure resistance range of 1.6MPa to 6.4MPa. The desuperheating and pressure reducing device 4 is connected to the external pipeline by screws and fixed by supports. The desuperheating and pressure reducing device 4 has a tube side and a shell side. A gas-liquid inlet 48 is opened from the shell side of the desuperheating and pressure reducing device 4 to the top of the outer surface of the desuperheating and pressure reducing device 4. A primary pipeline steam inlet pipe 41 is installed outside the gas-liquid inlet 48 by screws. The other end of the primary pipeline steam inlet pipe 41 extends to the outside and connects to the hot water supply system for transporting high-temperature hot water or steam.

[0037] An electric regulating valve 1 is fixedly installed at one end of the surface of the primary pipeline steam inlet pipe 41. A Y-type filter 2 is fixedly installed on the surface of the primary pipeline steam inlet pipe 41 on one side of the electric regulating valve 1. A shut-off valve 3 is fixedly installed on the surface of the primary pipeline steam inlet pipe 41 on one side of the Y-type filter 2. The shut-off valve 3 is normally in the open state.

[0038] Electric regulating valve 1, circulating pump 11, and water supply pump 12 are all equipped with a PLC logic control system for unified regulation. Electric regulating valve 1 can accurately adjust the valve opening by receiving signals from the control system, thereby controlling the flow rate of gas and liquid discharge. Y-type filter 2 has two-stage filter screens inside. The coarse filter screen on the side closer to the gas and liquid supply device is set with a pore size of 2.0 mm, and the fine filter screen on the side farther away from the gas and liquid supply device is set with a pore size of 1.5 mm. This effectively intercepts solid particles in the fluid and prevents impurities from entering the flow channel of plate heat exchanger 5. The shut-off valve 3 forms a forced seal for the gas and liquid fluid in the steam inlet pipe 41 of the primary pipeline. When the valve is closed, pressure is applied to the valve disc to force the steam inlet pipe 41 of the primary pipeline to be in a closed state.

[0039] Reference Figure 1 , Figure 2 , Figure 3 The tube of the desuperheater 4 has a liquid outlet 47 that is connected to the outside of the gas-liquid inlet 48. The liquid outlet 47 is sealed and connected to a secondary water supply pipe 46. The end of the secondary water supply pipe 46 away from the desuperheater 4 extends to connect to the external water supply network of the client to provide water at a suitable temperature and pressure.

[0040] The shell side of the desuperheater 4, away from the gas-liquid inlet 48, is connected downwards through a primary inlet connecting pipe 43. The top end of the primary inlet connecting pipe 43 is fixedly connected to the desuperheater 4 with bolts, and the bottom of the primary inlet connecting pipe 43 is fixedly connected to the primary inlet of the plate heat exchanger 5 with bolts. The medium to be cooled flows from the shell side of the desuperheater 4 through the primary inlet connecting pipe 43 into the primary inlet of the plate heat exchanger 5, exchanges heat with the secondary medium of the plate heat exchanger 5, and then flows out from the primary outlet of the plate heat exchanger 5. The bottom through-hole of the plate heat exchanger 5 is connected to a primary network condensate pipe 44 through a flange. A drain valve 6 is fixed on the surface of the middle part of the primary network condensate pipe 44. The drain valve 6 intercepts the gas in the water flow, thereby preventing the formation of cavities when the fluid flows in the pipeline system. The primary network condensate pipe 44 is connected to the external network, and the flow path of the primary side heat medium is thus realized.

[0041] The desuperheater 4 has a secondary outlet connection pipe 42 fixed externally on the other side of the tube side relative to the liquid outlet 47. One end of the secondary outlet connection pipe 42, located outside the desuperheater 4, is sealed and connected to the secondary network water supply pipe 46. The other end of the secondary outlet connection pipe 42 is located on the outer surface of the plate heat exchanger 5 and is sealed and fixed with bolts. The far end of the other side is connected to the secondary network return water pipe 45. A circulation pump 11 is installed in the middle. The cold medium in the secondary network return water pipe 45 flows through the circulation pump 11, through valves such as the flexible connection 10, and into the cold medium flow channel of the plate heat exchanger 5 to exchange heat with the primary side hot medium. Then, the cold medium flows through the secondary outlet connection pipe 42 and into the tube side of the desuperheater 4 to exchange heat with the steam-hot water medium in the shell side of the desuperheater 4. Finally, it flows through the liquid outlet 47 and into the secondary network water supply pipe 46 to supply water to the external network.

[0042] The implementation principle of a plate heat exchanger unit with a desuperheating and pressure reducing device in this application embodiment is as follows: When using this device, the hot water supply system supplies the heat medium, which flows into the heat medium shell side of the desuperheating and pressure reducing device 4 through the steam inlet pipe 41 of the primary pipeline network, then flows into the heat medium flow channel of the plate heat exchanger 5 through the primary inlet connecting pipe 43, and finally is transported to the external network through the condensate pipe 44 of the primary pipeline network, forming a heat medium flow route.

[0043] While the hot medium enters the plate heat exchanger 5, the cold medium is supplied by the external cold water supply equipment. The cold medium flows through the circulation pump 11 into the cold medium flow channel inside the plate heat exchanger 5 and exchanges heat with the hot medium flow channel inside the plate heat exchanger 5. Then, it flows into the tube side of the desuperheater 4 through the secondary outlet connection pipe 42 and exchanges heat with the hot medium inside the desuperheater 4. Finally, it flows into the secondary water supply pipe 46 through the liquid outlet 47, thereby providing a suitable temperature to the customer's external water supply network.

[0044] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A plate heat exchanger unit with a de-cooling and de-pressure reducing device, characterized in that: The unit includes a base frame (7), on one side of the top of the base frame (7) is a plate heat exchanger (5) for exchanging heat, and on one side of the top of the plate heat exchanger (5) is a de-cooling and pressure reducing device (4) for regulating the temperature of the receiving flow of the plate heat exchanger (5). On one side of the top of the de-cooling and pressure reducing device (4) is an electric regulating valve (1) for regulating the discharge flow. A Y-type filter (2) for filtering gas and liquid impurities is extended from the end of the electric regulating valve (1) away from the de-cooling and pressure reducing device (4). A shut-off valve (3) for cutting off the gas and liquid flow is provided at the end of the Y-type filter (2) away from the electric regulating valve (1). The plate heat exchanger (5) has multiple circulating pumps (11) for circulating water supply connected to one side of its bottom. The end of each of the multiple circulating pumps (11) away from the plate heat exchanger (5) is connected to a secondary pipeline return pipe (45). The multiple circulating pumps (11) are connected to multiple makeup water pumps (12) on one side of the secondary pipeline return pipe (45). All of the multiple makeup water pumps (12) are connected to external fluid supply equipment.

2. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 1, characterized in that: The desuperheating and pressure reducing device (4) includes a gas-liquid inlet (48) opened at the top of the desuperheating and pressure reducing device (4). A primary pipeline steam inlet pipe (41) is sealed at the opening of the gas-liquid inlet (48). The primary pipeline steam inlet pipe (41) is connected and fixed to the electric regulating valve (1), the Y-type filter (2) and the shut-off valve (3) respectively.

3. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 1, characterized in that: The desuperheater (4) has a liquid outlet (47) on the surface near the gas-liquid inlet (48), and a secondary water supply pipe (46) is sealed at the opening of the liquid outlet (47).

4. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 1, characterized in that: The bottom of the desuperheating and pressure reducing device (4) away from the gas-liquid inlet (48) is connected to a primary inlet connecting pipe (43). The end of the primary inlet connecting pipe (43) away from the desuperheating and pressure reducing device (4) is connected to the interior through the inlet at the top of the plate heat exchanger (5). A primary network condensate pipe (44) is connected to the outlet at the bottom of the plate heat exchanger (5). A drain valve (6) is fixed on the surface of the primary network condensate pipe (44).

5. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 1, characterized in that: The de-cooling and pressure reducing device (4) is connected to a secondary outlet connecting pipe (42) on the side surface of one end of the primary inlet connecting pipe (43). The end of the secondary outlet connecting pipe (42) away from the de-cooling and pressure reducing device (4) is connected to the top inlet of the plate heat exchanger (5).

6. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 1, characterized in that: Each of the circulating pumps (11) near the plate heat exchanger (5) has a sealed flexible connection (10) at its pipe connection.

7. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 6, characterized in that: Each of the multiple flexible connections (10) is fixed with a check valve (9) on the side near the plate heat exchanger (5) to prevent fluid backflow.

8. A plate heat exchanger unit with a de-cooling and de-pressure reducing device according to claim 7, characterized in that: Each of the aforementioned check valves (9) is fixed with a butterfly valve (8) for controlling the opening and closing of the fluid flow path on the side near the plate heat exchanger (5).

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