High-temperature and high-pressure condensate heat utilization system

Abstract

The invention provides a high-temperature and high-pressure condensate heat utilization system which comprises a circulating system, a heat supply system and a heat source system, the circulating system comprises an annular pipeline, a heat exchanger b, a circulating pump and a heat using device, the heat exchanger b, the circulating pump and the heat using device are installed on the annular pipeline, and the heat supply system comprises a heating medium, a heat supply pipeline, a backflow pipeline and a heat exchanger a. An inlet of the heat supply pipeline is connected with the heat exchanger a, an outlet of the heat supply pipeline is connected with the annular pipeline, an inlet of the backflow pipeline is connected with the annular pipeline, an outlet of the backflow pipeline is connected with the heat exchanger a, and a heating medium flows in the heat supply pipeline, the backflow pipeline and the annular pipeline. The two ends of the secondary heat supply pipeline communicate with the heat exchanger a and the heat exchanger b correspondingly, and a heat source medium in the heat source supplier enters the secondary heat supply pipeline through the heat exchanger a. The high-temperature and high-pressure condensate heat utilization system can fully utilize high-temperature and high-pressure condensate to supply heat to the circulating system.

Description

Technical Field

[0001] The invention belongs to the field of heating systems, and in particular relates to a high-temperature and high-pressure condensate heat utilization system. Background Art

[0002] With the acceleration of the global industrialization process, the efficient use of high-temperature and high-pressure steam as a key energy form has become a core issue in promoting industrial green transformation and sustainable development. The traditional high-temperature and high-pressure steam treatment process mainly relies on a simple liquefaction heat release process, and then directly introduces the high-temperature and high-pressure condensate rich in waste heat into the flash tank to generate high-temperature and low-pressure steam and condensate for subsequent use. However, this treatment method has a significant problem of low energy utilization efficiency, which is specifically manifested in incomplete waste heat recovery, serious heat emission losses, and the resulting energy waste, which seriously hinders the industrial field from moving towards a more green, low-carbon and sustainable direction.

[0003] Currently, although the secondary heat medium subsystem is widely used in the field of heat energy transfer and utilization, its original design intention is to achieve efficient heat transmission and utilization through closed system internal circulation. However, the existing secondary heat medium subsystem often relies on primary heat medium as the only or main heat source for supplementation. This model is powerless in the face of complex and changing industrial heat energy needs, and it is difficult to maintain the system's heating needs in a continuous and stable manner, which in turn affects the efficiency and benefits of overall heat energy utilization.

[0004] Patent CN213713039U discloses a hot standby utilization device for high-temperature and high-pressure condensate at the outlet of a heat transfer oil heat exchanger. Although the device performs heat exchange treatment on the high-temperature and high-pressure condensate, it does not fully utilize the heat of the high-temperature and high-pressure condensate, and does not set up a system for controlling heat utilization, resulting in serious waste of high-quality heat.

[0005] In order to overcome the shortcomings of existing technologies, it is urgent to develop an innovative high-temperature and high-pressure condensate heat utilization system. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a high-temperature and high-pressure condensate heat utilization system, which can fully utilize the high-temperature and high-pressure condensate to heat the circulation system.

[0007] The above object of the present invention is achieved through the following technical solutions:

[0008] The present invention provides a high-temperature and high-pressure condensate heat utilization system, comprising a circulation system, a heating system, and a heat source system. The circulation system comprises an annular pipeline, a heat exchanger B, a circulation pump, and a heat utilization device. The heat exchanger B, the circulation pump, and the heat utilization device are installed on the annular pipeline. The heating system comprises a heat medium, a heating pipeline, a return pipeline, and a heat exchanger A. The inlet of the heating pipeline is connected to the heat exchanger A, the outlet of the heating pipeline is connected to the annular pipeline, the inlet of the return pipeline is connected to the annular pipeline, the outlet of the return pipeline is connected to the heat exchanger A, and the heat medium flows in the heating pipeline, the return pipeline, and the annular pipeline. The heat source system comprises a heat source medium, a heat source supplier, and a secondary heating pipeline. Both ends of the secondary heating pipeline are respectively connected to the heat exchanger A and the heat exchanger B. The heat source medium in the heat source supplier enters the secondary heating pipeline through the heat exchanger A.

[0009] According to one embodiment of the present invention, a valve a is provided on the heating pipeline of the heating system, and a valve b is provided on the return pipeline.

[0010] According to one embodiment of the present invention, the circulation system also includes a control pipeline, a valve c, and a valve d. The A end and the B end of the control pipeline are respectively connected to the annular pipeline where the heat exchanger b is located. The valve c is arranged on the annular pipeline between the A end and the heat exchanger b, and the valve d is arranged on the control pipeline.

[0011] According to one embodiment of the present invention, there are N circulation systems.

[0012] According to one embodiment of the present invention, the heat source system further includes a destination pipeline and a boiler inlet, the destination pipeline inlet is connected to the heat exchanger b, and the destination pipeline outlet is connected to the boiler inlet.

[0013] According to one embodiment of the present invention, the heat source system also includes a high-temperature and high-pressure condensate outlet pipeline and a flash tank. The inlet of the high-temperature and high-pressure condensate outlet pipeline is connected to the secondary heating pipeline, and the outlet of the high-temperature and high-pressure condensate outlet pipeline is connected to the flash tank.

[0014] According to one embodiment of the present invention, a valve e is provided on the secondary heat supply pipeline between the heat exchanger b and the inlet of the high-temperature and high-pressure condensate outlet pipeline, and a valve f is provided on the high-temperature and high-pressure condensate outlet pipeline.

[0015] According to one embodiment of the present invention, a safety valve g is provided on the annular pipeline between the heat exchanger b and the B end of the control pipeline, and a safety valve h is provided on the outgoing pipeline.

[0016] The beneficial effects of the present invention compared with the prior art solutions are:

[0017] 1. The heat source medium provides heat to the heat medium in the heat exchanger a. After absorbing the heat, the heat medium enters the circulation system to provide heat. The heat medium then flows to the heat exchanger a through the return pipe for the next cycle. By continuously and indirectly providing high heat to the circulation system, it can effectively prevent the circulation system from being damaged when high heat is exchanged directly.

[0018] 2. The heat medium in the return pipeline and the heat source medium in the secondary heating pipeline exchange heat through heat exchanger a, and the heat source medium in the secondary heating pipeline and the heat medium in the ring pipeline exchange heat through heat exchanger b. The heat source medium indirectly provides high heat to the circulation system through the heating system, and directly provides the second highest heat to the circulation system in heat exchanger b. The circulation system is heated in a stepped manner, which can prevent high heat from damaging the circulation system and minimize energy loss.

[0019] 3. Valve a is set on the heating pipeline of the heating system, and valve b is set on the return pipeline. By opening valve a and closing valve b, the heat medium can fully enter the ring pipeline; then by closing valve a, the heat medium can fully exchange heat with the circulating heat medium in the ring pipeline; when the heat exchange is completed, by opening valve b, the heat medium can only leave the return pipeline. The setting of the two valves allows the heat medium to fully exchange heat with the circulating heat medium and move in a predetermined direction.

[0020] 4. The circulation system also includes a circulation pump. The circulation pump drives the heat medium to circulate in the annular pipeline, which can not only ensure that the heat medium fully supplies heat to the heat-using device, but also ensure stable heat supply to the heat-using device.

[0021] 5. A valve c is provided on the annular pipeline between the A end of the control pipeline and the heat exchanger b, and a valve d is provided on the control pipeline. The opening and closing of valves c and d can affect the degree of heating of the circulation system and accurately control the heating.

[0022] 6. Valve e is provided on the secondary heat supply pipeline between heat exchanger b and the inlet of high-temperature and high-pressure condensate outlet pipeline, and valve f is provided on the high-temperature and high-pressure condensate outlet pipeline. The degree of heat supply to the circulation system can be affected by adjusting the opening and closing of valves e and f, and the heat supply can be precisely controlled.

[0023] 7. A safety valve g is installed on the annular pipeline between the heat exchanger b and the B end of the control pipeline, and a safety valve h is installed on the outgoing pipeline. When other valves are damaged, the safe operation of the system can be guaranteed by adjusting the safety valve g and the safety valve h. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a system schematic diagram of embodiment 1 of the present invention;

[0025] Figure 2This is a system schematic diagram of Embodiment 2 of the present invention;

[0026] Figure 3 This is a system schematic diagram of Embodiment 3 of the present invention;

[0027] Figure 4 is a system schematic diagram of embodiment 4 of the present invention;

[0028] Figure 5 is a system schematic diagram of Embodiment 5 of the present invention;

[0029] In the figure, 1, heat medium; 2, heating pipeline; 3, return pipeline; 4, heat exchanger a; 5, ring pipeline; 6, heat exchanger b; 7, circulating pump; 8, heat using device; 9, heat source medium; 10, heat source supplier; 11, secondary heating pipeline; 12, valve a; 13, valve b; 14, control pipeline; 15, valve c; 16, valve d; 17, destination pipeline; 18, boiler inlet; 19, high-temperature and high-pressure condensate outlet pipeline; 20, flash tank; 21, valve e; 22, valve f; 23, safety valve g; 24, safety valve h; 201, heating pipeline a; 202, heating pipeline b; 301, return pipeline a; 302, return pipeline b; 601, heat exchanger c; 602, heat exchanger d. DETAILED DESCRIPTION

[0030] The present invention is described in detail below through specific embodiments, but the protection scope of the present invention is not limited thereto.

[0031] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0032] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] Example 1

[0034] like Figure 1 As shown, the heating system includes heat medium 1, heating pipeline 2, return pipeline 3, heat exchanger a4, valve a12, valve b13. The circulation system includes annular pipeline 5, heat exchanger b6, circulation pump 7, heat use device 8. The heat source system includes heat source medium 9, heat source supplier 10, and secondary heating pipeline 11.

[0035] The heat medium 1 flows in the heating pipeline 2, the return pipeline 3 and the ring pipeline 5. The inlet of the heating pipeline 2 is connected to the heat exchanger a4, and the outlet of the heating pipeline 2 is connected to the ring pipeline 5. The heating pipeline 2 is provided with a valve a12. The inlet of the return pipeline 3 is connected to the ring pipeline 5, and the outlet of the return pipeline 3 is connected to the heat exchanger a4. The return pipeline 3 is provided with a valve b13. The ring pipeline 5 is provided with a heat exchanger b6, a circulation pump 7, and a heat utilization device 8. The inlet of the secondary heating pipeline 11 is connected to the heat exchanger a4, and the outlet of the secondary heating pipeline 11 is connected to the heat exchanger b6. The heat source medium 9 enters the secondary heating pipeline 11 through the heat source supplier 10.

[0036] Open valve a12, close valve b13, and heat medium 1 will enter the annular pipeline 5 through the heating pipeline 2 after heat exchange in heat exchanger a4. Close valve a12, close valve b13, and driven by circulation pump 7, heat medium 1 will continue to provide heat to heat using device 8 in annular pipeline 5, and heat source medium 9 can continue to provide heat to heat medium 1 through heat exchanger b6. Close valve a12, open valve b13, heat medium 1 will flow to heat exchanger a4 through return pipeline 3, and heat medium 1 will enter heat exchanger a4 again for the next cycle.

[0037] The heat source medium 9 enters the secondary heat supply pipeline 11 from the heat source supplier 10. The heat source medium 9 provides heat to the heat medium 1 when passing through the heat exchanger a4 and the heat exchanger b6.

[0038] Example 2

[0039] like Figure 1-2 As shown, the heating system includes heat medium 1, heating pipeline 2, return pipeline 3, heat exchanger a4, valve a12, valve b13. The circulation system includes ring pipeline 5, heat exchanger b6, circulation pump 7, heat use device 8, control pipeline 14, valve c15, valve d16. The heat source system includes heat source medium 9, heat source supplier 10, secondary heating pipeline 11, destination pipeline 17, boiler inlet 18.

[0040] The heat medium 1 flows in the heating pipeline 2, the return pipeline 3 and the annular pipeline 5. The inlet of the heating pipeline 2 is connected to the heat exchanger a4, and the outlet of the heating pipeline 2 is connected to the annular pipeline 5. The heating pipeline 2 is provided with a valve a12. The inlet of the return pipeline 3 is connected to the annular pipeline 5, and the outlet of the return pipeline 3 is connected to the heat exchanger a4. The return pipeline 3 is provided with a valve b13. The annular pipeline 5 is provided with a heat exchanger b6, a circulation pump 7, and a heat using device 8. The inlet of the secondary heating pipeline 11 is connected to the heat exchanger a4, and the outlet of the secondary heating pipeline 11 is connected to the heat exchanger b6. The heat source medium 9 enters the secondary heating pipeline 11 through the heat source supplier 10. The A end and the B end of the control pipeline 14 are respectively connected to the annular pipeline 5 where the heat exchanger b6 is located. The valve c15 is provided on the annular pipeline 5 between the A end and the heat exchanger b6, and the valve d16 is provided on the control pipeline 14. The inlet of the outgoing pipeline 17 is connected to the heat exchanger b6, and the outlet of the outgoing pipeline 17 is connected to the boiler inlet 18.

[0041] Open valve a12, close valve b13, and heat medium 1 enters the annular pipeline 5 through the heating pipeline 2 after heat exchange in heat exchanger a4. Close valve a12, close valve b13, and driven by circulation pump 7, heat medium 1 continues to provide heat to heat using device 8 in annular pipeline 5, and heat source medium 9 can continue to provide heat to heat medium 1 through heat exchanger b6. Close valve a12, open valve b13, heat medium 1 leaves annular pipeline 5 through return pipeline 3, and heat medium 1 enters heat exchanger a4 again for the next cycle.

[0042] The heat source medium 9 enters the secondary heat supply pipeline 11 from the heat source supplier 10. The heat source medium 9 provides heat to the heat medium 1 when passing through the heat exchanger a4 and the heat exchanger b6. After heat exchange in the heat exchanger b6, the heat source medium 9 flows to the boiler inlet 18 through the destination pipeline 17.

[0043] When valve c15 is opened and valve d16 is closed, heat source medium 9 can continuously provide heat to heat medium 1 through heat exchanger b6. When valve c15 is closed and valve d16 is opened, heat source medium 9 cannot continuously provide heat to heat medium 1 through heat exchanger b6. By controlling the opening and closing of valve c15 and valve d16, the amount of heat provided by heat source medium 9 to heat medium 1 can be precisely controlled, thereby precisely controlling the amount of heat received by heat using device 8.

[0044] Example 3

[0045] like Figure 1-3As shown, the heating system includes heat medium 1, heating pipeline 2, return pipeline 3, heat exchanger a4, valve a12, valve b13. The circulation system includes ring pipeline 5, heat exchanger b6, circulation pump 7, heat use device 8. The heat source system includes heat source medium 9, heat source supplier 10, secondary heating pipeline 11, destination pipeline 17, boiler inlet 18, high temperature and high pressure condensate outlet pipeline 19, flash tank 20, valve e21, valve f22.

[0046] The heat medium 1 flows in the heating pipeline 2, the return pipeline 3 and the annular pipeline 5. The inlet of the heating pipeline 2 is connected to the heat exchanger a4, and the outlet of the heating pipeline 2 is connected to the annular pipeline 5. The heating pipeline 2 is provided with a valve a12. The inlet of the return pipeline 3 is connected to the annular pipeline 5, and the outlet of the return pipeline 3 is connected to the heat exchanger a4. The return pipeline 3 is provided with a valve b13. The annular pipeline 5 is provided with a heat exchanger b6, a circulation pump 7, and a heat using device 8. The inlet of the secondary heating pipeline 11 is connected to the heat exchanger a4, and the outlet of the secondary heating pipeline 11 is connected to the heat exchanger b6. The heat source medium 9 enters the secondary heating pipeline 11 through the heat source supplier 10. The A end and the B end of the control pipeline 14 are respectively connected to the annular pipeline 5 where the heat exchanger b6 is located. The valve c15 is provided on the annular pipeline 5 between the A end and the heat exchanger b6, and the valve d16 is provided on the control pipeline 14. The inlet of the outgoing pipeline 17 is connected to the heat exchanger b6, and the outlet of the outgoing pipeline 17 is connected to the boiler inlet 18. A valve e21 is provided on the secondary heating pipeline 11, and a valve f22 is provided on the high-temperature and high-pressure condensate outlet pipeline 19. The inlet of the high-temperature and high-pressure condensate outlet pipeline 19 is connected to the secondary heating pipeline 11, and the outlet of the high-temperature and high-pressure condensate outlet pipeline 19 is connected to the flash tank 20.

[0047] Open valve a12, close valve b13, and heat medium 1 enters the annular pipeline 5 through the heating pipeline 2 after heat exchange in heat exchanger a4. Close valve a12, close valve b13, and driven by circulation pump 7, heat medium 1 continues to provide heat to heat using device 8 in annular pipeline 5, and heat source medium 9 can continue to provide heat to heat medium 1 through heat exchanger b6. Close valve a12, open valve b13, heat medium 1 leaves annular pipeline 5 through return pipeline 3, and heat medium 1 enters heat exchanger a4 again for the next cycle.

[0048] The heat source medium 9 enters the secondary heat supply pipeline 11 from the heat source supplier 10. The heat source medium 9 provides heat to the heat medium 1 when passing through the heat exchanger a4 and the heat exchanger b6. After heat exchange in the heat exchanger b6, the heat source medium 9 flows to the boiler inlet 18 through the destination pipeline 17.

[0049] Open valve e21 and close valve f22, and the heat source medium 9 can provide secondary heat to the heat medium 1 through the heat exchanger b6. Close valve e21 and open valve f22, and the heat source medium 9 will enter the flash tank 20 for flash evaporation after heat exchange in the heat exchanger a4, and the heat source medium 9 will become low-temperature condensate and steam. By controlling the opening and closing of valves e21 and f22, the amount of heat that the heat using device 8 can receive can be effectively controlled, and when the circulation system is damaged, the heat source medium 9 can be introduced into the flash tank 20 to repair the circulation system.

[0050] Example 4

[0051] like Figure 1-4 As shown, based on Example 3, the circulation system can be two, the heat source 1 enters the circulation system a from the heat exchanger a4 through the heat supply pipeline a201, the heat source 1 enters the circulation system b from the heat exchanger a4 through the heat supply pipeline b202, the heat source 1 enters the heat exchanger a4 from the circulation system a through the return pipeline a301, and the heat source 1 enters the heat exchanger 4 from the circulation system b through the return pipeline b302. The heat source medium 9 enters the secondary heat supply pipeline 11 through the heat source supplier 10, the heat source medium 9 exchanges heat with the heat source 1 through the heat exchanger c601 of the circulation system a, and the heat source medium 9 exchanges heat with the heat source 1 through the heat exchanger d602 of the circulation system b. At this time, the heat exchanger c601 of the circulation system a can be a high-temperature and high-pressure condensate heat exchanger system E-600, the heat utilization device 8 of the circulation system a can be a user, the heat exchanger d602 of the circulation system b can be a high-temperature and high-pressure condensate heat exchanger system 17-E09, and the heat utilization device 8 of the circulation system a can be a heater.

[0052] By setting up N circulation systems, the heat source medium 9 can provide heat to different heat using devices 8 at the same time, which greatly improves the use efficiency of the heat of the heat source medium 9.

[0053] Example 5

[0054] like Figure 1-5As shown, on the basis of Example 4, a safety valve g23 is provided on the annular pipeline 5 between the heat exchanger b6 and point B, and a safety valve h24 is provided on the outgoing pipeline 17. The safety valve g23 and the safety valve h24 are opened for a long time, and the safety valve g23 and the safety valve h24 can assist the valve a12, valve b13, valve c15, valve d16, valve e21, and valve f22 to work. When the valve c15 is damaged, the heat exchange degree of the circulation system can be adjusted by replacing the valve c15 with the valve d16 and the safety valve g23. When the valve e21 is damaged, the heat exchange degree of the circulation system can be adjusted by replacing the valve e21 with the safety valve g23 and the safety valve h24. By closing the valve d16, the safety valve g23 and the safety valve h24, the flow of the heat source 1 and the heat source medium 9 in the whole system is forced to stop, so that the whole system can be repaired.

[0055] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A high-temperature and high-pressure condensate heat utilization system, characterized in that: The invention comprises a circulation system, a heating system and a heat source system. The circulation system comprises a ring pipeline (5), a heat exchanger b (6), a circulation pump (7) and a heat using device (8). The heat exchanger b (6), the circulation pump (7) and the heat using device (8) are installed on the ring pipeline (5). The heating system comprises a heat medium (1), a heating pipeline (2), a return pipeline (3) and a heat exchanger a (4). The inlet of the heating pipeline (2) is connected to the heat exchanger a (4). The outlet of the heating pipeline (2) is connected to the ring pipeline (5). The return pipeline (3 ) inlet is connected to the annular pipeline (5), the outlet of the return pipeline (3) is connected to the heat exchanger a (4), the heat medium (1) flows in the heat supply pipeline (2), the return pipeline (3), and the annular pipeline (5), the heat source system comprises a heat source medium (9), a heat source supplier (10), and a secondary heat supply pipeline (11), the two ends of the secondary heat supply pipeline (11) are respectively connected to the heat exchanger a (4) and the heat exchanger b (6), and the heat source medium (9) in the heat source supplier (10) enters the secondary heat supply pipeline (11) through the heat exchanger a (4).

2. A high temperature and high pressure condensate heat utilization system according to claim 1, characterized in that: A valve a (12) is provided on the heating pipeline (2) of the heating system, and a valve b (13) is provided on the return pipeline (3).

3. A high temperature and high pressure condensate heat utilization system according to claim 2, characterized in that: The circulation system further comprises a control pipeline (14), a valve c (15), and a valve d (16); the A end and the B end of the control pipeline (14) are respectively connected to the annular pipeline (5) where the heat exchanger b (6) is located; the valve c (15) is arranged on the annular pipeline (5) between the A end and the heat exchanger b (6); and the valve d (16) is arranged on the control pipeline (14).

4. A high temperature and high pressure condensate heat utilization system according to claim 3, characterized in that: The number of the circulation systems is N.

5. A high temperature and high pressure condensate heat utilization system according to claim 4, characterized in that: The heat source system further comprises a destination pipeline (17) and a boiler inlet (18); the destination pipeline (17) inlet is connected to the heat exchanger b (6), and the destination pipeline (17) outlet is connected to the boiler inlet (18).

6. A high temperature and high pressure condensate heat utilization system according to claim 5, characterized in that: The heat source system further comprises a high-temperature and high-pressure condensate outlet pipeline (19) and a flash tank (20); the inlet of the high-temperature and high-pressure condensate outlet pipeline (19) is connected to the secondary heat supply pipeline (11), and the outlet of the high-temperature and high-pressure condensate outlet pipeline (19) is connected to the flash tank (20).

7. A high temperature and high pressure condensate heat utilization system according to claim 6, characterized in that: A valve e (21) is provided on the secondary heat supply pipeline (11) between the heat exchanger b (6) and the inlet of the high-temperature and high-pressure condensate outlet pipeline (19), and a valve f (22) is provided on the high-temperature and high-pressure condensate outlet pipeline (19).

8. A high temperature and high pressure condensate heat utilization system according to claim 7, characterized in that: A safety valve g (23) is provided on the annular pipeline (5) between the heat exchanger b (6) and the B end of the control pipeline (14), and a safety valve h (24) is provided on the outgoing pipeline (17).

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