A steam condensate recovery system

Abstract

The utility model relates to condensate water recovery technical field discloses a steam condensate water recovery system. Wherein steam condensate water recovery system includes flash tank, condensate water supply line, pumping line, heat exchange line and exhaust line. Flash tank is provided with air inlet, exhaust and water outlet, condensate water supply line upstream communication in main steam condensate water supply mechanism, condensate water supply line's downstream communication in air inlet, pumping line upstream communication in water outlet, pumping line's downstream communication in boiler room reuse pipeline, and first water pump is set up on pumping line, heat exchange line's upstream communication in steam supply mechanism, heat exchange line's downstream communication in heat exchange mechanism, and ejector is set up on heat exchange line, and ejector is communicated with exhaust through exhaust line. The utility model has realized the effective solution condensate water pipeline in " water hammer " phenomenon, has realized the secondary utilization of secondary flash steam, reduces the heat energy loss, reduces the environmental pollution and improves the condensate water recovery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of condensate recovery technology, and in particular to a steam condensate recovery system. Background Technology

[0002] In industrial production, steam is widely used as an important heat source. The condensate produced during its transport or after heat exchange still has significant residual heat, making it highly valuable for recovery. Due to long-distance transport, insufficient pipeline insulation, system pressure fluctuations, and changes in start-up and shutdown conditions, the steam temperature in the main steam pipe drops below the saturation temperature at the corresponding pressure. The steam then transforms from a gaseous state to a liquid state, producing condensate. At this point, the condensate has a high pressure and temperature, making it high-temperature, high-pressure condensate. However, end-user steam equipment typically requires pressure reduction before entering the equipment for process heat exchange, increasing steam heat loss. The resulting condensate has a lower temperature and pressure than the condensate from the main steam pipe. In other words, the pressure and temperature of the condensate produced by steam vary depending on the operating conditions.

[0003] Currently, saturated steam exchanges heat with process equipment materials at the end of the process, producing low-pressure condensate, which is then transported through low-pressure condensate pipelines. The high-pressure condensate from the remaining steam, along with the low-pressure condensate, flows into the same main condensate pipe before entering a flash tank. In the flash tank, depressurization and flash evaporation are completed. The depressurized liquid condensate is stored in the tank. When a certain level is reached, a water pump is activated to send the condensate to the boiler room for treatment and reuse. Flash steam, on the other hand, is directly discharged outdoors through a discharge pipe at the top of the flash tank.

[0004] However, this system has two main problems. First, due to the pressure and temperature differences between high- and low-pressure condensate, "water hammer" is prone to occur at pipe junctions, bends, and diameter changes. This creates impacts and generates significant vibrations inside the condensate pipes, which can severely loosen pipe supports, damage pipes, and affect the stable operation of the entire condensate system. Second, the secondary steam from the flash evaporation of the condensate after depressurization in the flash tank is directly discharged outdoors, resulting in some heat loss and causing high-temperature and noise pollution to the environment.

[0005] Therefore, there is an urgent need for a steam condensate recovery system to solve the aforementioned problems. Utility Model Content

[0006] Based on the above, the purpose of this utility model is to provide a steam condensate recovery system that effectively solves the "water hammer" phenomenon in condensate pipes, realizes the secondary utilization of secondary flash steam, reduces heat loss, reduces environmental pollution, and improves condensate recovery efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A steam condensate recovery system includes:

[0009] A flash evaporator is provided with an air inlet, an exhaust outlet, and a drain outlet;

[0010] The condensate supply pipeline is connected upstream to the main steam condensate supply mechanism and downstream to the air inlet.

[0011] The pumping pipeline is connected upstream to the drain outlet and downstream to the boiler room reuse pipeline. A first water pump is installed on the pumping pipeline.

[0012] A heat exchange pipeline, the upstream of which is connected to a steam supply mechanism, the downstream of which is connected to a heat exchange mechanism, and an ejector is provided on the heat exchange pipeline.

[0013] An exhaust pipe, through which the ejector is connected to the exhaust port.

[0014] As a preferred technical solution for a steam condensate recovery system, a remote magnetic level gauge is installed inside the flash tank. The remote magnetic level gauge is used to detect the level of condensate in the flash tank and is electrically connected to the first water pump.

[0015] As a preferred technical solution for a steam condensate recovery system, the pumping pipeline is also equipped with a first butterfly valve, a first check valve, and a second butterfly valve, with the first butterfly valve, the first water pump, the first check valve, and the second butterfly valve arranged in sequence.

[0016] As a preferred technical solution for a steam condensate recovery system, the pumping pipeline further includes a pumping branch, one end of which is connected upstream of the first butterfly valve and the other end is connected downstream of the second butterfly valve. A third butterfly valve, a second water pump, a second check valve, and a fourth butterfly valve are sequentially installed on the pumping branch.

[0017] As a preferred technical solution for a steam condensate recovery system, the heat exchange mechanism includes a heat exchanger, an air conditioning heating plate water supply pipe, an air conditioning heating plate return water pipe, and a condensate return water pipe. The heat exchanger is provided with a first heat exchange path and a second heat exchange path. One end of the first heat exchange path is connected to the downstream of the heat exchange pipe, and the other end is connected to the condensate return water pipe. One end of the second heat exchange path is connected to the air conditioning heating plate water supply pipe, and the other end is connected to the air conditioning heating plate return water pipe. The first heat exchange path and the second heat exchange path can exchange heat.

[0018] As a preferred technical solution for a steam condensate recovery system, the heat exchange pipeline is further equipped with a first temperature sensor, a first pressure sensor, a second temperature sensor, and a second pressure sensor. The first temperature sensor and the first pressure sensor are located upstream of the ejector, and the second temperature sensor and the second pressure sensor are located downstream of the ejector.

[0019] As a preferred technical solution for a steam condensate recovery system, a first valve group is also provided on the heat exchange pipeline. The first valve group is located upstream of the ejector and is electrically connected to the second pressure sensor.

[0020] As a preferred technical solution for a steam condensate recovery system, a first bypass branch is also provided on the heat exchange pipeline, the first valve group is connected in parallel with the first bypass branch, and a first shut-off valve is provided on the first bypass branch.

[0021] As a preferred technical solution for a steam condensate recovery system, the exhaust pipe is equipped with a second shut-off valve and a third check valve.

[0022] As a preferred technical solution for a steam condensate recovery system, it also includes a drain pipe, wherein the flash tank is located at the drain outlet, and the drain pipe is connected to the drain outlet.

[0023] The beneficial effects of this utility model are as follows:

[0024] This invention provides a steam condensate recovery system. A main steam condensate supply mechanism supplies high-pressure condensate, which enters a flash tank via a condensate supply pipeline. Within the flash tank, depressurization and flash evaporation are completed, achieving vapor-liquid separation. The resulting low-pressure condensate collects in the flash tank. When the condensate level in the flash tank reaches a preset level, the first pump in the pumping pipeline begins to draw water, transporting the low-pressure condensate from the flash tank to the boiler room reuse pipeline. During the process of the high-pressure condensate entering the flash tank, it does not merge with the low-pressure condensate, effectively solving the "water hammer" phenomenon in the condensate pipeline, eliminating pipeline impact, and ensuring the stable operation of the condensate system.

[0025] Furthermore, the secondary flash steam generated in the flash tank is transported to the ejector via the exhaust pipe. The secondary flash steam pressure is approximately 0.1 MPa. The steam supply mechanism can supply high-pressure steam with a pressure of approximately 1 MPa. After the flash steam is ejected by the high-pressure steam, its pressure increases, while the high-pressure steam pressure decreases. Finally, they mix in the ejector to form medium-low pressure saturated steam with a pressure of approximately 0.3 MPa and a temperature of approximately 143°C. The mixed gas then enters the heat exchange mechanism for heat exchange, realizing the secondary utilization of the secondary flash steam, reducing heat loss, reducing environmental pollution, and improving condensate recovery efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the steam condensate recovery system provided in a specific embodiment of the present invention.

[0028] The markings in the image are as follows:

[0029] 1. Flash tank; 11. Air inlet; 12. Exhaust outlet; 13. Drain outlet; 14. Sewage outlet;

[0030] 2. Condensate supply pipeline; 21. Main steam condensate supply mechanism; 22. Third shut-off valve;

[0031] 3. Pumping pipeline; 31. First butterfly valve; 32. First water pump; 33. First check valve; 34. Second butterfly valve; 35. Pumping branch line; 351. Third butterfly valve; 352. Second water pump; 353. Second check valve; 354. Fourth butterfly valve; 36. Boiler room reuse pipeline;

[0032] 4. Heat exchange piping; 41. Steam supply mechanism; 42. First temperature sensor; 43. First pressure sensor; 44. Second temperature sensor; 45. Second pressure sensor; 46. First valve group; 47. First bypass branch; 471. First shut-off valve; 48. Ejector;

[0033] 5. Heat exchange mechanism; 51. Heat exchanger; 52. Air conditioning heating plate water supply pipeline; 521. Fifth shut-off valve; 522. Fifth temperature sensor; 523. Fifth pressure sensor; 53. Air conditioning heating plate return water pipeline; 531. Fourth shut-off valve; 532. Fourth temperature sensor; 533. Fourth pressure sensor; 54. Condensate return water pipeline; 541. Second valve group; 542. Second bypass branch; 543. Sixth shut-off valve;

[0034] 6. Exhaust pipe; 61. Second shut-off valve; 62. Third check valve;

[0035] 7. Remote magnetic level gauge; 8. Sewage discharge pipeline. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0037] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] like Figure 1As shown, this embodiment provides a steam condensate recovery system, which includes a flash tank 1, a condensate supply pipeline 2, a pumping pipeline 3, a heat exchange pipeline 4, and an exhaust pipeline 6. The flash tank 1 is provided with an air inlet 11, an exhaust outlet 12, and a drain outlet 13; the upstream of the condensate supply pipeline 2 is connected to the main steam condensate supply mechanism 21, and the downstream of the condensate supply pipeline 2 is connected to the air inlet 11; the upstream of the pumping pipeline 3 is connected to the drain outlet 13, and the downstream of the pumping pipeline 3 is connected to the boiler room reuse pipeline 36, and a first water pump 32 is provided on the pumping pipeline 3; the upstream of the heat exchange pipeline 4 is connected to the steam supply mechanism 41, and the downstream of the heat exchange pipeline 4 is connected to the heat exchange mechanism 5, and an ejector 48 is provided on the heat exchange pipeline 4; the ejector 48 is connected to the exhaust outlet 12 through the exhaust pipeline 6.

[0041] During operation, the main steam condensate supply mechanism 21 supplies high-pressure condensate. The high-pressure condensate enters the flash tank 1 through the condensate supply pipeline 2, where it undergoes depressurization and flash evaporation to achieve vapor-liquid separation. The resulting low-pressure condensate collects in the flash tank 1. When the condensate in the flash tank 1 reaches the preset level, the first water pump 32 of the pumping pipeline 3 starts to draw water, transporting the low-pressure condensate in the flash tank 1 to the boiler room reuse pipeline 36. During the process of the high-pressure condensate entering the flash tank 1, it does not merge with the low-pressure condensate, effectively solving the "water hammer" phenomenon in the condensate pipeline, eliminating pipeline impact, and ensuring the stable operation of the condensate system.

[0042] Furthermore, the secondary flash steam generated by flash tank 1 is transported to ejector 48 via exhaust pipe 6. The pressure of the secondary flash steam is about 0.1 MPa. Steam supply mechanism 41 can supply high-pressure steam with a pressure of about 1 MPa. After the flash steam is ejected by high-pressure steam, the pressure increases, while the pressure of the high-pressure steam decreases. Finally, they are mixed in ejector 48 to form medium-low pressure saturated steam with a pressure of about 0.3 MPa and a temperature of about 143°C. Finally, the mixed gas enters heat exchange mechanism 5 for heat exchange, realizing the secondary utilization of secondary flash steam, reducing heat loss, reducing environmental pollution, and improving condensate recovery efficiency.

[0043] In this embodiment, the low-pressure condensate and saturated steam in the flash tank 1 exchange heat with the process equipment materials at the end, and the resulting low-pressure condensate (not shown in the figure) is collected and transported to the boiler room reuse pipeline 36 to achieve graded recovery of condensate.

[0044] Preferably, a remote magnetic level gauge 7 is installed inside the flash tank 1. The remote magnetic level gauge 7 is used to detect the level of condensate in the flash tank 1 and is electrically connected to the first water pump 32. When the condensate level in the flash tank 1 reaches the preset level, the remote magnetic level gauge 7 transmits the level signal to the PLC control program. The first water pump 32 starts and pumps the low-pressure condensate in the flash tank 1 back to the boiler room reuse pipeline 36, where it is filtered, deoxygenated by a deaerator, and then recycled.

[0045] Furthermore, a third shut-off valve 22 is installed on the condensate supply pipeline 2, which can control the high-pressure condensate to enter the flash tank 1. The third shut-off valve 22 is normally in the open state.

[0046] The steam condensate recovery system also includes a drain pipe 8. The flash tank 1 is located at the drain outlet 14. The drain pipe 8 is connected to the drain outlet 14. The flash tank 1 needs to be drained regularly.

[0047] The pumping pipeline 3 is also equipped with a first butterfly valve 31, a first check valve 33, and a second butterfly valve 34. The first butterfly valve 31, the first water pump 32, the first check valve 33, and the second butterfly valve 34 are arranged in sequence. The first butterfly valve 31 is installed before the first water pump 32. After the first water pump 32 is debugged and running normally, the first butterfly valve 31 is normally open. The first check valve 33 and the second butterfly valve 34 are installed after the first water pump 32. The first check valve 33 ensures that the condensate flows unidirectionally towards the outlet and prevents backflow from the first water pump 32. The second butterfly valve 34 is normally open.

[0048] The pumping pipeline 3 also includes a pumping branch 35, one end of which is connected upstream of the first butterfly valve 31, and the other end is connected downstream of the second butterfly valve 34. A third butterfly valve 351, a second water pump 352, a second check valve 353, and a fourth butterfly valve 354 are sequentially installed on the pumping branch 35. The first butterfly valve 31, the first water pump 32, the first check valve 33, and the second butterfly valve 34 on the pumping pipeline 3 serve as backups for each other with the third butterfly valve 351, the second water pump 352, the second check valve 353, and the fourth butterfly valve 354 on the pumping branch 35. When one condensate pump fails, the other condensate pump will automatically start to ensure that the flash tank 1 does not exceed the liquid level. A third pressure sensor is installed on the condensate supply pipeline 2 for pressure monitoring, and the pressure change in the main pipe can be used to determine whether the first water pump 32 or the second water pump 352 is working properly.

[0049] Furthermore, a second shut-off valve 61 and a third check valve 62 are installed on the exhaust pipe 6. The second shut-off valve 61 can regulate the flash steam entering the ejector 48, and the third check valve 62 ensures that the flash steam flows in one direction.

[0050] Preferably, the heat exchange pipeline 4 is further provided with a first temperature sensor 42, a first pressure sensor 43, a second temperature sensor 44, and a second pressure sensor 45. The first temperature sensor 42 and the first pressure sensor 43 are located upstream of the ejector 48 to monitor the temperature and pressure at the high-pressure steam inlet in real time. The second temperature sensor 44 and the second pressure sensor 45 are located downstream of the ejector 48 to monitor the temperature and pressure at the outlet of the heat exchange pipeline 4 in real time.

[0051] A first valve assembly 46 is also installed on the heat exchange pipeline 4. The first valve assembly 46 is located upstream of the ejector 48 and is electrically connected to the second pressure sensor 45. The opening of the electrically adjustable valve of the first valve assembly 46 is automatically adjusted by the pressure signal from the second pressure sensor 45.

[0052] Preferably, a first bypass branch 47 is also provided on the heat exchange pipeline 4, and the first valve group 46 is connected in parallel with the first bypass branch 47. A first shut-off valve 471 is provided on the first bypass branch 47. The first bypass branch 47 is normally closed, but can be opened to ensure system operation when the first valve group 46 fails or needs maintenance.

[0053] In this embodiment, the heat exchange mechanism 5 includes a heat exchanger 51, an air conditioning hot plate water supply pipe 52, an air conditioning hot plate return water pipe 53, and a condensate return water pipe 54. The heat exchanger 51 is equipped with a first heat exchange path and a second heat exchange path. One end of the first heat exchange path is connected to the downstream of the heat exchange pipe 4, and the other end is connected to the condensate return water pipe 54. One end of the second heat exchange path is connected to the air conditioning hot plate water supply pipe 52, and the other end is connected to the air conditioning hot plate return water pipe 53. The first and second heat exchange paths can exchange heat. The mixed gas generated by the ejector 48 is driven by its own pressure into the first heat exchange path of the heat exchanger 51, where it exchanges heat with the approximately 40°C central air conditioning hot plate return water located in the second heat exchange path. The central air conditioning hot plate return water is heated within the heat exchanger 51, reaching an outlet temperature of approximately 60°C, and is then sent back to the air conditioning hot plate water supply pipe 52 for recycling through the outlet pipe, thus fully recovering the waste heat from the flash steam. After the flash steam exchanges heat in the heat exchanger 51, its temperature and pressure drop, and it condenses to form low-temperature, low-pressure condensate. The condensate is then sent back to the boiler room for treatment and recycling through the condensate return pipeline 54.

[0054] In this embodiment, a fourth shut-off valve 531, a fourth temperature sensor 532, and a fourth pressure sensor 533 are installed on the air conditioning hot plate return water pipe 53 to detect the temperature and pressure of the central air conditioning hot plate return water. By adjusting the opening of the fourth shut-off valve 531, the amount of hot plate return water entering the heat exchanger 51 is balanced with the flash steam for heat exchange.

[0055] A fifth shut-off valve 521, a fifth temperature sensor 522, and a fifth pressure sensor 523 are installed on the water supply pipeline 52 of the air conditioning heat plate. The fifth shut-off valve 521 is normally open and monitors the temperature and pressure of the water supply to the air conditioning heat plate in real time to ensure that it meets the process requirements of heat exchange of the air conditioning heat plate.

[0056] A second valve assembly 541 and a second bypass branch 542 are installed on the condensate return pipe 54. The second valve assembly 541 and the second bypass branch 542 are connected in parallel. A sixth shut-off valve 543 is installed on the second bypass branch 542. During maintenance, the sixth shut-off valve 543 of the second bypass branch 542 is opened; normally it is closed. The second valve assembly 541 mainly drains low-pressure condensate and prevents a small amount of flash steam leakage.

[0057] In this embodiment, the second valve group 541 includes two shut-off valves and a drain valve located between the two shut-off valves.

[0058] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A steam condensate recovery system, characterized in that, include: The flash tank (1) is provided with an air inlet (11), an exhaust outlet (12) and a drain outlet (13). The condensate supply pipeline (2) is connected upstream to the main steam condensate supply mechanism (21), and downstream to the air inlet (11). The pumping pipe (3) is connected upstream to the drain outlet (13) and downstream to the boiler room reuse pipe (36). A first water pump (32) is installed on the pumping pipe (3). A heat exchange pipeline (4) is connected upstream to a steam supply mechanism (41) and downstream to a heat exchange mechanism (5). An ejector (48) is provided on the heat exchange pipeline (4). The exhaust pipe (6) is connected to the exhaust port (12) through the exhaust pipe (6).

2. The steam condensate recovery system according to claim 1, characterized in that, The flash tank (1) is equipped with a remote magnetic level gauge (7), which is used to detect the level of condensate in the flash tank (1). The remote magnetic level gauge (7) is electrically connected to the first water pump (32).

3. The steam condensate recovery system according to claim 1, characterized in that, The water pumping pipeline (3) is also equipped with a first butterfly valve (31), a first check valve (33), and a second butterfly valve (34), which are arranged in sequence.

4. The steam condensate recovery system according to claim 3, characterized in that, The pumping pipeline (3) also includes a pumping branch (35), one end of which is connected to the upstream of the first butterfly valve (31) and the other end is connected to the downstream of the second butterfly valve (34). The pumping branch (35) is provided with a third butterfly valve (351), a second water pump (352), a second check valve (353) and a fourth butterfly valve (354) in sequence.

5. The steam condensate recovery system according to claim 1, characterized in that, The heat exchange mechanism (5) includes a heat exchanger (51), an air conditioning heating plate water supply pipe (52), an air conditioning heating plate water return pipe (53), and a condensate water return pipe (54). The heat exchanger (51) is provided with a first heat exchange path and a second heat exchange path. One end of the first heat exchange path is connected to the downstream of the heat exchange pipe (4), and the other end is connected to the condensate water return pipe (54). One end of the second heat exchange path is connected to the air conditioning heating plate water supply pipe (52), and the other end is connected to the air conditioning heating plate water return pipe (53). The first heat exchange path and the second heat exchange path can exchange heat.

6. The steam condensate recovery system according to claim 1, characterized in that, The heat exchange pipeline (4) is also equipped with a first temperature sensor (42), a first pressure sensor (43), a second temperature sensor (44), and a second pressure sensor (45). The first temperature sensor (42) and the first pressure sensor (43) are located upstream of the ejector (48), and the second temperature sensor (44) and the second pressure sensor (45) are located downstream of the ejector (48).

7. The steam condensate recovery system according to claim 6, characterized in that, The heat exchange pipeline (4) is also provided with a first valve group (46), which is located upstream of the ejector (48) and is electrically connected to the second pressure sensor (45).

8. The steam condensate recovery system according to claim 7, characterized in that, The heat exchange pipeline (4) is also provided with a first bypass branch (47), the first valve group (46) is connected in parallel with the first bypass branch (47), and a first shut-off valve (471) is provided on the first bypass branch (47).

9. The steam condensate recovery system according to claim 1, characterized in that, The exhaust pipe (6) is equipped with a second shut-off valve (61) and a third check valve (62).

10. The steam condensate recovery system according to claim 1, characterized in that, It also includes a sewage pipe (8), the flash tank (1) is located at the sewage outlet (14), and the sewage pipe (8) is connected to the sewage outlet (14).

Images