Condensate water heat recovery system
By using multiple heat exchangers and desalted water circulation in the condensate heat recovery system, the problem of increasing the load and power consumption of circulating water in the prior art is solved, and efficient heat recovery and coal consumption are achieved.
Patent Information
- Application Number
- CN202421893113.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-08-07
AI Technical Summary
Existing condensate recovery technology increases the load and electricity consumption of the circulating water system, is used to remove unrecycled heat and increases steam consumption during the condensate reuse, resulting in increased coal consumption.
A condensate heat recovery system is designed to recover heat through the first and second heat exchangers, and recycled desalted water instead of circulating water, reducing the need for heat removal.
Through heat recovery, the steam consumption of thermoelectric and boiler water deoxygenation systems is reduced, and the amount of gas production and thermal coal used in the boiler is reduced.
Smart Images
Figure CN222964488U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat energy recovery, in particular to a condensate heat recovery system. Background Art
[0002] In contemporary chemical industry, centrifugal compressors are widely used to boost the pressure of media such as carbon dioxide compressors, syngas compressors, and boosters for air separation, and also for material transmission and material refrigeration, such as air compressors and ammonia compressors. As its power source, steam turbines are more economical than motors. After the operation of steam turbines in most chemical projects, the recovery of condensate becomes particularly important. The recovered condensate will reduce the use of demineralized water and save a large amount of funds. However, in the existing condensate recovery technology, only the condensate itself is recovered, and the heat that comes back with the condensate is not recovered. In order to remove this part of heat, not only the load of the circulating water system needs to be increased, which increases the power consumption, but also the consumption of steam increases during the subsequent reuse of the condensate, so the coal consumption increases accordingly.
[0003] Based on this, a condensate heat recovery system is provided now, which can eliminate the disadvantages of the existing devices. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a condensate heat recovery system to solve the problems that the existing condensate recovery technology increases the load and power consumption of the circulating water system to remove the unrecovered heat, and additional steam consumption is required during the subsequent reuse of the condensate, resulting in an increase in coal consumption.
[0005] To achieve the above purpose, the utility model provides the following technical solutions:
[0006] The condensate heat recovery system includes a first steam condensate pipeline, a first heat exchanger, a second steam condensate pipeline, a condensate water tank, a condensate pump, a third steam condensate pipeline, an activated carbon filter, a first condensate pipeline, a cation and anion resin mixed bed, a condensate pipeline, a microporous filter, a second condensate pipeline, a second heat exchanger, a turbine condensate pipeline, a first demineralized water pipeline, a demineralized water tank, a second demineralized water pipeline, a demineralized water pump, a third demineralized water pipeline, a fourth demineralized water pipeline, a fifth demineralized water pipeline, and a demineralized water network;
[0007] It further includes a condensate collection and preliminary heat exchange unit, and the condensate collection and preliminary heat exchange unit includes the first steam condensate pipeline and the first heat exchanger, which are used to introduce the steam condensate containing heat into the first heat exchanger for preliminary heat exchange;
[0008] A condensate purification unit, and the condensate purification unit includes a condensate water tank for preliminary purification of the condensate;
[0009] A heat recovery unit, which includes a second heat exchanger for recovering and utilizing the remaining heat in the condensate.
[0010] A desalted water preparation unit, which includes a mixed bed of anion and cation resins for preparing and supplying desalted water.
[0011] Based on the above technical solutions, the present utility model also provides the following optional technical solutions:
[0012] In an optional solution: The condensate collection and preliminary heat exchange unit includes a first steam condensate pipeline and a first heat exchanger. The first steam condensate pipeline is connected to the upper part of the first heat exchanger, and the upper part of the first heat exchanger is connected to the lower part of a condensate water tank through a second steam condensate pipeline.
[0013] In an optional solution: The condensate purification unit includes a condensate water tank. The lower part of the condensate water tank is connected to the upper part of an activated carbon filter through a condensate pump and a third steam condensate pipeline, and the lower part of the activated carbon filter is connected to the upper part of the mixed bed of anion and cation resins through a first condensate pipeline.
[0014] In an optional solution: The upper part of the mixed bed of anion and cation resins is connected to a condensate pipeline through a first condensate pipeline, the condensate pipeline is then connected to the upper part of a microporous filter, and the upper part of the microporous filter is connected to the upper part of the second heat exchanger through a second condensate pipeline.
[0015] In an optional solution: The heat recovery unit includes a second heat exchanger. The upper part of the second heat exchanger is connected to a turbine condensate pipeline, and the desalted water output by the desalted water pump is divided into two paths through a third desalted water pipeline.
[0016] In an optional solution: One path of the third desalted water pipeline is connected to the lower part of the second heat exchanger for heat exchange, and the lower part of the second heat exchanger is connected to a desalted water network through a fourth desalted water pipeline.
[0017] In an optional solution: The other path of the desalted water output by the desalted water pump is connected to the first heat exchanger for heat exchange. After the third desalted water pipeline converges with the fourth desalted water pipeline through a fifth desalted water pipeline, it is finally connected to the desalted water network.
[0018] In an optional solution: The desalted water preparation unit includes a mixed bed of anion and cation resins. The mixed bed of anion and cation resins is connected to the middle part of a desalted water tank through a first desalted water pipeline, and the lower part of the desalted water tank is connected to the input end of a desalted water pump through a second desalted water pipeline.
[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0020] The utility model uses the regenerated demineralized water to replace the circulating water, cools the first steam condensate pipeline and the turbine condensate pipeline through two heat exchangers, and realizes the purpose of heat recovery of the demineralized water at the same time; at the same time, the demineralized water recovers heat, reduces the steam consumption of the thermoelectric and boiler water deaeration systems, reduces both the coal consumption for boiler gas production and the consumption of power coal. Brief Description of the Drawings
[0021] Figure 1 It is a schematic wireframe structure diagram of the utility model.
[0022] Annotation of reference numerals in the drawings: 1. First steam condensate pipeline; 2. First heat exchanger; 3. Second steam condensate pipeline; 4. Condensate water tank; 5. Condensate pump; 6. Third steam condensate pipeline; 7. Activated carbon filter; 8. First condensate pipeline; 9. Turbine condensate pipeline; 10. Second heat exchanger; 11. Second condensate pipeline; 12. Microporous filter; 13. Condensate pipeline; 14. Mixed bed of anion and cation resins; 15. First demineralized water pipeline; 16. Demineralized water tank; 17. Second demineralized water pipeline; 18. Demineralized water pump; 19. Third demineralized water pipeline; 20. Fourth demineralized water pipeline; 21. Fifth demineralized water pipeline; 22. Demineralized water pipe network. Detailed Embodiments
[0023] In order to make the purpose, technical solutions and advantages of the utility model clearer, the following further details the utility model with reference to the drawings and embodiments.
[0024] In one embodiment, as Figure 1 shown, the condensate heat recovery system includes a first steam condensate pipeline 1, a first heat exchanger 2, a second steam condensate pipeline 3, a condensate water tank 4, a condensate pump 5, a third steam condensate pipeline 6, an activated carbon filter 7, a first condensate pipeline 8, a mixed bed of anion and cation resins 14, a condensate pipeline 13, a microporous filter 12, a second condensate pipeline 11, a second heat exchanger 10, a turbine condensate pipeline 9, a first demineralized water pipeline 15, a demineralized water tank 16, a second demineralized water pipeline 17, a demineralized water pump 18, a third demineralized water pipeline 19, a fourth demineralized water pipeline 20, a fifth demineralized water pipeline 21 and a demineralized water pipe network 22;
[0025] It further includes a condensate collection and preliminary heat exchange unit, and the condensate collection and preliminary heat exchange unit includes the first steam condensate pipeline 1 and the first heat exchanger 2, which are used to introduce the steam condensate containing heat into the first heat exchanger 2 for preliminary heat exchange;
[0026] A condensate purification unit, and the condensate purification unit includes a condensate water tank 4, which is used for preliminary purification treatment of the condensate;
[0027] Heat recovery unit, the heat recovery unit includes a second heat exchanger 10 for recovering and utilizing the remaining heat in the condensate;
[0028] Desalted water preparation unit, the desalted water preparation unit includes a mixed anion and cation resin bed 14 for realizing the preparation and supply of desalted water.
[0029] In this embodiment, the steam condensate enters the first heat exchanger 2 through the first steam condensate pipeline 1, exchanges heat with another fluid, recovers heat and reduces the temperature of the condensate.
[0030] The condensate after preliminary heat exchange flows into the condensate water tank 4 for purification treatment.
[0031] In the condensate water tank 4, the condensate undergoes preliminary sedimentation and filtration to remove large particle impurities and suspended matters therein.
[0032] The purified condensate is heat-exchanged again in the second heat exchanger 10 to recover the remaining heat and further reduce the temperature.
[0033] The condensate enters the mixed anion and cation resin bed 14 for ion exchange desalination treatment after further purification through a microporous filter 12, an activated carbon filter 7, etc.
[0034] The mixed anion and cation resin bed 14 utilizes the adsorption and exchange capabilities of the resin to remove salts and ionic impurities in the water and prepare desalted water.
[0035] The prepared desalted water is transported to each water usage point for reuse through a desalinated water pump 18 and the corresponding desalinated water pipeline.
[0036] Meanwhile, heat can also be recovered and utilized during the circulation process of the desalted water in the system.
[0037] In one embodiment, as Figure 1 shown, the condensate collection and preliminary heat exchange unit includes a first steam condensate pipeline 1 and a first heat exchanger 2. The first steam condensate pipeline 1 is connected to the upper part of the first heat exchanger 2, and the upper part of the first heat exchanger 2 is connected to the lower part of the condensate water tank 4 through a second steam condensate pipeline 3, for collecting steam condensate and conducting preliminary heat exchange in the first heat exchanger 2 to reduce the temperature of the condensate.
[0038] In one embodiment, as Figure 1 shown, the condensate purification unit includes a condensate water tank 4. The lower part of the condensate water tank 4 is connected to the upper part of an activated carbon filter 7 through a condensate pump 5 and a third steam condensate pipeline 6, and the lower part of the activated carbon filter 7 is connected to the upper part of a mixed anion and cation resin bed 14 through a first condensate pipeline 8, for purifying the condensate to remove impurities and pollutants.
[0039] In one embodiment, as Figure 1 shown, the upper part of the anion-cation resin mixed bed 14 is connected to the condensate pipeline 13 through the first condensate pipeline 8, the condensate pipeline 13 is then connected to the upper part of the microporous filter 12, and the upper part of the microporous filter 12 is connected to the upper part of the second heat exchanger 10 through the second condensate pipeline 11, which is used for further treating the purified condensate water and preparing for heat recovery.
[0040] In one embodiment, as Figure 1 shown, the heat recovery unit includes a second heat exchanger 10. The upper part of the second heat exchanger 10 is connected to the turbine condensate pipeline 9. The desalted water output by the desalination water pump 18 is divided into two paths through the third desalinated water pipeline 19. The desalted water output by the desalination water pump is supplied in two paths through the third desalinated water pipeline 19. This way of split supply can flexibly adjust the water volume and water quality of each water-using point according to actual needs, ensuring the stable operation and efficient utilization of the system. At the same time, the split supply also provides convenient conditions for the subsequent reuse of desalted water.
[0041] In one embodiment, as Figure 1 shown, one path of the third desalinated water pipeline 19 is connected to the lower part of the second heat exchanger 10 for heat exchange. The lower part of the second heat exchanger 10 is connected to the desalinated water network 22 through the fourth desalinated water pipeline 20, which is used for recovering the heat in the condensate water and preheating other fluids.
[0042] In one embodiment, as Figure 1 shown, the other path of the desalted water output by the desalination water pump 18 is connected to the first heat exchanger 2 for heat exchange. After the third desalinated water pipeline 19 converges with the fourth desalinated water pipeline 20 through the fifth desalinated water pipeline 21, it is finally connected to the desalinated water network 22, realizing the reuse of desalted water and heat recovery.
[0043] In one embodiment, as Figure 1 shown, the desalted water preparation unit includes an anion-cation resin mixed bed 14. The anion-cation resin mixed bed 14 is connected to the middle part of the desalted water tank 16 through the first desalinated water pipeline 15. The lower part of the desalted water tank 16 is connected to the input end of the desalination water pump 18 through the second desalinated water pipeline 17, which is used for preparing high-quality desalted water and storing it in the desalted water tank 16.
[0044] The above embodiment discloses a condensate water heat recovery system. Among them, after the steam condenses in the equipment, it enters the upper part of the first heat exchanger 2 through the first steam condensate pipeline 1.
[0045] In the first heat exchanger 2, the condensate water exchanges heat with the fluid to be heated, initially reducing its temperature and recovering part of the heat.
[0046] The condensed water after preliminary heat exchange flows into the lower part of the condensate water tank 4 through the second steam condensate pipeline 3 for storage.
[0047] The condensed water in the condensate water tank 4 is transported to the upper part of the activated carbon filter 7 through the condensate pump 5 and the third steam condensate pipeline 6.
[0048] In the activated carbon filter 7, the condensed water is filtered to remove impurities such as organic matter and residual chlorine, improving the water quality.
[0049] The condensed water after being filtered by the activated carbon enters the upper part of the anion-cation resin mixed bed 14 through the first condensate pipeline 8 for deep purification, further removing ions and minerals in the water.
[0050] The purified condensed water enters the upper part of the microporous filter 12 through the condensate pipeline 13 for final filtration to ensure that the water quality is pure and free of impurities.
[0051] The condensed water after microporous filtration enters the upper part of the second heat exchanger 10 through the second condensate pipeline 11.
[0052] In the second heat exchanger 10, the condensed water exchanges heat with the fluid to be cooled, such as turbine condensate, which enters through the turbine condensate pipeline 9, recovering the remaining heat in the condensed water and reducing its temperature.
[0053] Part of the cooled condensed water, or desalted water, is directly discharged into the desalted water pipe network 22 through the fourth desalted water pipeline 20 for use in other processes.
[0054] While purifying the condensed water, the anion-cation resin mixed bed 14 also prepares high-quality desalted water. This desalted water enters the middle part of the desalted water tank 16 for storage through the first desalted water pipeline 15.
[0055] When needed, the desalted water in the desalted water tank 16 is pumped out by the desalted water pump 18 through the second desalted water pipeline 17.
[0056] The output end of the desalted water pump 18 is connected to the third desalted water pipeline 19, which divides into two paths:
[0057] One path is connected to the lower part of the second heat exchanger 10 for heat exchange to further utilize the heat energy.
[0058] The other path is connected to the first heat exchanger 2 and converges with the fourth desalted water pipeline 20 through the fifth desalted water pipeline 21, and finally discharges into the desalted water pipe network 22 for use in other processes.
[0059] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims
1. A condensate heat recovery system, comprising a first steam condensate pipeline (1), a first heat exchanger (2), a second steam condensate pipeline (3), a condensate water tank (4), a condensate pump (5), a third steam condensate pipeline (6), an activated carbon filter (7), a first condensate pipeline (8), a cation-cation resin mixed bed (14), a condensate pipeline (13), a microporous filter (12), a second condensate pipeline (11), a second heat exchanger (10), a turbine condensate pipeline (9), a first desalted water pipeline (15), a desalted water tank (16), a second desalted water pipeline (17), a desalted water pump (18), a third desalted water pipeline (19), a fourth desalted water pipeline (20), a fifth desalted water pipeline (21) and a desalted water pipeline network (22); It is characterized in that It also includes a condensate collection and preliminary heat exchange unit, which includes a first steam condensate pipeline (1) and a first heat exchanger (2), and is used to introduce the steam condensate containing heat into the first heat exchanger (2) for preliminary heat exchange; A condensate purification unit, the condensate purification unit comprising a condensate tank (4) for performing preliminary purification treatment on the condensate; A heat recovery unit, the heat recovery unit comprising a second heat exchanger (10) for recovering and utilizing the remaining heat in the condensate; A desalted water preparation unit, the desalted water preparation unit comprising a mixed bed of cation and anion resins (14) for preparing and supplying desalted water; The condensate collection and preliminary heat exchange unit comprises a first steam condensate pipeline (1) and a first heat exchanger (2), wherein the first steam condensate pipeline (1) is connected to the upper part of the first heat exchanger (2), and the upper part of the first heat exchanger (2) is connected to the lower part of the condensate water tank (4) through a second steam condensate pipeline (3); The condensate purification unit comprises a condensate water tank (4), the lower part of the condensate water tank (4) is connected to the upper part of the activated carbon filter (7) through a condensate pump (5) and a third steam condensate pipeline (6), the lower part of the activated carbon filter (7) is connected to the upper part of the cation and anion resin mixed bed (14) through a first condensate pipeline (8); the upper part of the cation and anion resin mixed bed (14) is connected to a condensate pipeline (13) through the first condensate pipeline (8), the condensate pipeline (13) is further connected to the upper part of the microporous filter (12), and the upper part of the microporous filter (12) is connected to the upper part of the second heat exchanger (10) through a second condensate pipeline (11); The heat recovery unit comprises a second heat exchanger (10), the upper part of which is connected to a turbine condensate pipeline (9), and the desalted water output by the desalted water pump (18) is divided into two paths through a third desalted water pipeline (19).
2. The condensed water heat recovery system according to claim 1, characterized in that: The third desalted water pipeline (19) is connected to the lower part of the second heat exchanger (10) for heat exchange, and the lower part of the second heat exchanger (10) is connected to the desalted water network (22) through the fourth desalted water pipeline (20).
3. The condensed water heat recovery system according to claim 1, characterized in that: The desalted water output by the desalted water pump (18) is connected to the first heat exchanger (2) through another route of the third desalted water pipeline (19) for heat exchange; the third desalted water pipeline (19) is connected to the fourth desalted water pipeline (20) through the fifth desalted water pipeline (21) and finally connected to the desalted water pipeline network (22).
4. The condensed water heat recovery system according to claim 1, characterized in that: The desalted water preparation unit comprises a cation-cation resin mixed bed (14), wherein the cation-cation resin mixed bed (14) is connected to the middle of a desalted water tank (16) via a first desalted water pipeline (15), and the lower part of the desalted water tank (16) is connected to the input end of a desalted water pump (18) via a second desalted water pipeline (17).