Electrolytic aluminum waste heat power generation system

Abstract

The utility model belongs to the field of waste heat utilization, and particularly relates to an electrolytic aluminum waste heat power generation system which is suitable for waste heat recycling of an electrolytic aluminum system. The electrolytic aluminum waste heat power generation system utilizes heat in an electrolytic cell to generate water vapor, the water vapor is utilized to push an efficient turbine to drive a generator to generate power, dead steam after acting is cooled by a condenser and then enters a hot well, and condensed water continues to enter the next round of cyclic utilization through a condensed water pump. According to the scheme, waste heat of electrolytic aluminum can be recycled, the energy utilization rate of a production line can be increased, generated electricity can be reversely supplied to the electrolytic cell, and the production cost is reduced. Besides, according to the scheme, the system is simplified, the efficiency is improved, waste heat and flue gas waste heat in the electrolytic bath are utilized to the maximum extent through the multiple mother pipe modes, a large amount of land is reduced through the mother pipe modes, and arrangement and maintenance of the system are more convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of waste heat utilization, specifically relates to a kind of electrolytic aluminium waste heat power generation system. BACKGROUND

[0002] The statements in this section merely provide background information related to the technical solutions of the present application to help understand, which do not necessarily constitute the prior art for the technical solutions of the present application.

[0003] Electrolytic aluminium is the main production process of aluminium in China, which is widely used and in great demand. In the process of electrolytic aluminium, heat is generated, and this part of heat is generally discharged through flue gas, which not only causes thermal pollution, but also causes waste of heat. According to the electrolytic aluminium production process, the flue gas temperature and the temperature in the electrolytic cell are both relatively high and stable. If reasonable waste heat recovery is carried out without affecting the main process production, not only the energy utilization rate of the production line can be improved, but also the electricity generated can be fed back to the electrolytic cell to reduce production cost. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problem of waste heat of electrolytic cell, the present application provides a kind of electrolytic aluminium waste heat power generation system.

[0005] One aspect of the present application relates to a kind of electrolytic aluminium waste heat power generation system, it includes desalted water pump inlet valve, desalted water pump, desalted water pump outlet valve, desalted water mother pipe, flue gas heat exchanger, flue gas heat exchanger flue gas side inlet valve, flue gas heat exchanger flue gas side outlet valve, flue gas side partition valve, flue gas heat exchanger water side inlet valve, flue gas heat exchanger water side outlet valve, deaerator, deaerator mother pipe connected to deaerator, sewer pipe, feed water pump, feed water mother pipe, plate heat exchanger in electrolytic aluminium cell, feed water inlet valve, evaporation heat exchanger, steam mother pipe, steam filter, steam filter pipe, high-efficiency turbine, generator, condenser, hot well, condensate pipe, condensate pump, condensate pump pipe, steam filter bottom pipe, deaerator heating device,

[0006] The desalted water pump outlet valve is connected to the outlet of the desalted water pump through the desalted water main pipe, the flue gas heat exchanger flue gas side inlet valve, the flue gas heat exchanger flue gas side outlet valve and the flue gas side partition valve are connected to the flue gas pipeline of the flue gas heat exchanger, the flue gas heat exchanger water side inlet valve is connected to the desalted water main pipe, the flue gas heat exchanger water side outlet valve is connected to the deaerator main pipe, the deaerator is provided with the deaerator heating device, the lower part of the deaerator is provided with the lower water pipeline, the lower water pipeline is connected to the feed water pump, the outlet of the feed water pump is connected to the feed water main pipe, the feed water main pipe is connected to the plate heat exchanger, the plate heat exchanger is provided with the feed water inlet valve in front of the plate heat exchanger, the plate heat exchanger is connected to the evaporation heat exchanger, the evaporation heat exchanger is connected to the steam trap through the steam main pipe, the steam trap is connected to the high-efficiency turbine through the steam trap pipeline, the high-efficiency turbine drives the generator, the high-efficiency turbine is connected to the condenser, the lower part of the condenser is provided with the hot well, the hot well is connected to the condensate pump through the condensate pipeline, the condensate pump is connected to the desalted water main pipe through the condensate pump pipeline, and the bottom of the steam trap is connected to the deaerator heating device through the steam trap bottom pipeline.

[0007] In one embodiment, the desalted water pump inlet valve is connected to the inlet of the desalted water pump through the desalted water pump inlet pipeline.

[0008] In one embodiment, the feed water pump is provided with a feed water pump inlet valve and a feed water pump outlet valve.

[0009] In one embodiment, a steam valve is arranged between the evaporation heat exchanger and the steam main pipe.

[0010] In one embodiment, a turbine inlet valve is arranged on the steam trap pipeline.

[0011] In one embodiment, a condensate inlet valve is arranged on the condensate pipeline.

[0012] In one embodiment, a condensate outlet valve is arranged on the condensate pump pipeline.

[0013] In one embodiment, a steam trap drain valve and a heating device inlet valve are arranged on the steam trap bottom pipeline.

[0014] In the above scheme, the desalted water and the condensate enter the desalted water main pipe, are supplied to each flue gas heat exchanger through the desalted water main pipe, the desalted water which has exchanged heat is sent to the deaerator through the deaerator main pipe, the water which has been deaerated in the deaerator is sent to the feed water main pipe through the feed water pump, the feed water main pipe delivers the deaerated water to the plate heat exchanger and the evaporation heat exchanger, the generated steam enters the steam main pipe to the steam trap, and the steam after the steam trap enters the high-efficiency turbine to do work, thereby driving the generator to generate electricity.

[0015] The scheme of the present application can recycle and utilize the waste heat of electrolytic aluminum, can improve the energy utilization rate of the production line, and the generated electricity can be used to compensate the electrolytic tank, thereby reducing the production cost. In addition, the scheme simplifies the system, improves the efficiency, maximizes the utilization of the waste heat in the electrolytic tank and the waste heat of flue gas through the multiple mother pipe form, reduces a large amount of land through the mother pipe form, and is more convenient for the arrangement and maintenance of the system. BRIEF DESCRIPTION OF DRAWINGS

[0016] The embodiments of the present application will be further described below with reference to the drawings, in which:

[0017] Figure 1 It is a structural schematic view of an electrolytic aluminum waste heat power generation system according to an embodiment. DETAILED DESCRIPTION

[0018] The technical scheme in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0019] Figure 1 It is a structural schematic view of an electrolytic aluminum waste heat power generation system according to an embodiment, which comprises a desalted water pump inlet valve 1, a desalted water pump 2, a desalted water pump outlet valve 3, a desalted water mother pipe 15, a flue gas heat exchanger 8, a flue gas heat exchanger flue gas side inlet valve 5, a flue gas heat exchanger flue gas side outlet valve 7, a flue gas side cutoff valve 6, a flue gas heat exchanger water side inlet valve 4, a flue gas heat exchanger water side outlet valve 9, a deaerator 18, a deaerator mother pipe 17 connected to the deaerator 18, a sewer pipe 19, a feed water pump 21, a feed water mother pipe 23, a plate heat exchanger 11 in an electrolytic aluminum tank, a feed water inlet valve 10, an evaporation heat exchanger 12, a steam mother pipe 24, a steam trap 25, a steam trap pipe 26, a high-efficiency turbine 28, a generator 29, a condenser 30, a hot well 31, a condensate pipe 32, a condensate pump 34, a condensate pump pipe 36, a steam trap bottom pipe 37, and a deaerator heating device 40.

[0020] The desalted water pump outlet valve 3 is connected at the outlet of the desalted water pump 2 through the desalted water mother pipe 15. The flue gas heat exchanger flue gas side inlet valve 5, the flue gas heat exchanger flue gas side outlet valve 7, and the flue gas side cutoff valve 6 are connected on the flue gas pipe of the flue gas heat exchanger 8. The flue gas heat exchanger water side inlet valve 4 is connected to the desalted water mother pipe 15, and the flue gas heat exchanger water side outlet valve 9 is connected to the deaerator mother pipe 17.

[0021] The deaerator 18 is provided with the deaerator heating device 40, and the lower part of the deaerator 18 is provided with the sewer pipe 19, which is connected to the feed water pump 21. The outlet of the feed water pump 21 is connected to the feed water main pipe 23, which is connected to the plate heat exchanger 11, and the feed water inlet valve 10 is arranged in front of the plate heat exchanger 11. The plate heat exchanger 11 is connected to the evaporation heat exchanger 12, which is connected to the steam trap 25 through the steam main pipe 24, and the steam trap 25 is connected to the high-efficiency turbine 28 through the steam trap pipe 26, and the high-efficiency turbine 28 drives the generator 29. The high-efficiency turbine 28 is connected to the condenser 30, and the condenser 30 is provided with the hot well 31 below, which is connected to the condensate pump 34 through the condensate pipe 32, and the condensate pump 34 is connected to the desalted water main pipe 15 through the condensate pump pipe 36. The bottom of the steam trap 25 is connected to the deaerator heating device 40 through the steam trap bottom pipe 37.

[0022] In one embodiment, the desalted water pump inlet valve 1 is connected to the inlet of the desalted water pump 2 through the desalted water pump inlet pipe 14.

[0023] In one embodiment, the feed water pump 21 is provided with the feed water pump inlet valve 20 and the feed water pump outlet valve 22.

[0024] In one embodiment, the evaporation heat exchanger 12 and the steam main pipe 24 are provided with the steam valve 13.

[0025] In one embodiment, the turbine inlet valve 27 is arranged on the steam trap pipe 26.

[0026] In one embodiment, the condensate inlet valve 33 is arranged on the condensate pipe 32.

[0027] In one embodiment, the condensate outlet valve 35 is arranged on the condensate pump pipe 36.

[0028] In one embodiment, the steam trap drain valve 38 and the heating device inlet valve 39 are arranged on the steam trap bottom pipe 37.

[0029] The electrolytic aluminum waste heat utilization system of the application converts water into steam through a heat exchanger, the steam drives a steam turbine to do work, thereby driving a generator to generate electricity, achieving the purpose of waste heat counter-supplementing the electricity consumption of the electrolytic cell. Specifically, the flue gas temperature of the electrolytic cell is used to heat the condensed water through a flue gas heat exchanger, the heated condensed water is deaerated in a deaerator, and the deaerated water enters the heat exchanger inside the electrolytic cell for re-heating; the water enters the plate heat exchanger inside the electrolytic cell for the first heat exchange, the heat-exchanged water enters the evaporation heat exchanger, the evaporation heat exchanger serves both heat exchange and evaporation, the evaporated water vapor enters the filter trap, the steam entering the filter trap becomes saturated steam after passing through the filter trap, and enters the high-efficiency turbine to do work; the steam after doing work condenses into water in the condenser, and enters the flue gas heat exchanger through the condensed water pump for continuous heat exchange, forming a cycle; a drain pipe is arranged at the lower part of the filter trap and connected to the heating device in the deaerator, and the hot water enters the deaerator to heat the water in the deaerator for deaeration. In an embodiment, the system is provided with four mother pipe systems, which can ensure that each electrolytic cell can be connected to the mother pipe system, thereby improving the system operation efficiency and simplifying the system land occupation.

[0030] Reference made herein to "various embodiments", "some embodiments", "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in various embodiments", "in some embodiments", "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It will thus be appreciated that specific features, structures, or characteristics described in one embodiment can be incorporated in any suitable manner in one or more other embodiments without limitation.

[0031] Some example embodiments of the utility model are described above, and it can be understood that the above embodiments are only used to explain the utility model and do not constitute the limitation of the protection scope of the utility model. The features in these embodiments can be recombined in a suitable manner, and the schemes obtained thereby are still within the protection scope required by the utility model. Based on the above embodiments, all other embodiments obtained by the person skilled in the art without making creative labor, namely all modifications, equivalent replacements and improvements made within the spirit and principles of the application, are also within the protection scope required by the utility model.

Claims

1. A system for generating power from waste heat of electrolytic aluminum, comprising a desalted water pump inlet valve (1), a desalted water pump (2), a desalted water pump outlet valve (3), a desalted water main pipe (15), a flue gas heat exchanger (8), a flue gas heat exchanger flue gas side inlet valve (5), a flue gas heat exchanger flue gas side outlet valve (7), a flue gas side cut-off valve (6), a flue gas heat exchanger water side inlet valve (4), a flue gas heat exchanger water side outlet valve (9), a deaerator (18), a deaerator main pipe (17) connected to the deaerator (18), a downcomer (19), a feed water pump (21), a feed water main pipe (23), a plate heat exchanger (11) in an electrolytic aluminum cell, a feed water inlet valve (10), an evaporation heat exchanger (12), a steam main pipe (24), a steam trap (25), a steam trap pipe (26), a high-efficiency turbine (28), a generator (29), a condenser (30), a hot well (31), a condensate pipe (32), a condensate pump (34), a condensate pump pipe (36), a steam trap bottom pipe (37), a deaerator heating device (40), the desalted water pump outlet valve (3) is connected at the outlet of the desalted water pump (2) through the desalted water main pipe (15), the flue gas heat exchanger flue gas side inlet valve (5), the flue gas heat exchanger flue gas side outlet valve (7), and the flue gas side cut-off valve (6) are connected on the flue gas pipe of the flue gas heat exchanger (8), the flue gas heat exchanger water side inlet valve (4) is connected to the desalted water main pipe (15), the flue gas heat exchanger water side outlet valve (9) is connected to the deaerator main pipe (17), the deaerator heating device (40) is arranged in the deaerator (18), the deaerator (18) is provided with the downcomer (19) at the lower part, the downcomer (19) is connected to the feed water pump (21), the outlet of the feed water pump (21) is connected to the feed water main pipe (23), the feed water main pipe (23) is connected to the plate heat exchanger (11), the plate heat exchanger (11) is provided with the feed water inlet valve (10) in front of it, the plate heat exchanger (11) is connected to the evaporation heat exchanger (12), the evaporation heat exchanger (12) is connected to the steam trap (25) through the steam main pipe (24), the steam trap (25) is connected to the high-efficiency turbine (28) through the steam trap pipe (26), the high-efficiency turbine (28) drives the generator (29), the high-efficiency turbine (28) is connected to the condenser (30), the condenser (30) is provided with the hot well (31) below it, the hot well (31) is connected to the condensate pump (34) through the condensate pipe (32), the condensate pump (34) is connected to the desalted water main pipe (15) through the condensate pump pipe (36), and the steam trap (25) is connected to the deaerator heating device (40) through the steam trap bottom pipe (37).

2. The system for power generation from waste heat of electrolytic aluminum according to claim 1, wherein the desalted water pump inlet valve (1) is connected at the inlet of the desalted water pump (2) through a desalted water pump inlet pipe (14).

3. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, The feed water pump (21) is provided with a feed water pump inlet valve (20) and a feed water pump outlet valve (22).

4. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, A steam valve (13) is arranged between the evaporative heat exchanger (12) and the steam main (24).

5. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, A turbine inlet valve (27) is arranged on the filter pipe (26).

6. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, A condensate inlet valve (33) is arranged on the condensate pipe (32).

7. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, A condensate outlet valve (35) is arranged on the condensate pump pipe (36).

8. The system for power generation by waste heat of electrolytic aluminum according to claim 1, wherein, A filter drain valve (38) and a heating device inlet valve (39) are arranged on the filter bottom pipe (37).

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