CN219798020U - Electrolytic aluminum flue gas waste heat utilization system - Google Patents
Electrolytic aluminum flue gas waste heat utilization system Download PDFInfo
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- CN219798020U CN219798020U CN202321237620.8U CN202321237620U CN219798020U CN 219798020 U CN219798020 U CN 219798020U CN 202321237620 U CN202321237620 U CN 202321237620U CN 219798020 U CN219798020 U CN 219798020U
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- flue gas
- waste heat
- heat exchanger
- electrolytic aluminum
- utilization system
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- 239000003546 flue gas Substances 0.000 title claims abstract description 129
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000002918 waste heat Substances 0.000 title claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000010248 power generation Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 14
- 238000000746 purification Methods 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 239000000498 cooling water Substances 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000003009 desulfurizing effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 11
- 230000008901 benefit Effects 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses an electrolytic aluminum flue gas waste heat utilization system, which comprises: the system comprises a flue gas waste heat recovery subsystem, an organic Rankine cycle power generation subsystem and a flue gas purification subsystem. The flue gas waste heat recovery subsystem is used for recovering the waste heat of the electrolytic aluminum flue gas and heating the high-pressure circulating water. The organic Rankine cycle power generation subsystem is used for absorbing heat of high-pressure circulating water, heating an organic working medium to generate steam for power generation, and cooling the working organic working medium steam for circulation. The flue gas purification subsystem is used for removing dust and desulfurizing the heat exchanged electrolytic aluminum flue gas, and discharging the flue gas after reaching standards. Solves the problems of low utilization rate of low-temperature flue gas of electrolytic aluminum, and the like.
Description
Technical Field
The utility model belongs to the technical field of industrial waste heat and waste energy utilization, and particularly relates to an electrolytic aluminum flue gas waste heat utilization system.
Background
The electrolytic aluminum adopts a high-current and low-voltage electrolysis mode in the production process, and consumes a large amount of electric energy. Wherein the energy actually used for the electrolytic reaction is less than 50% of the input energy, and other energy is dissipated in various forms, and the heat taken away by the flue gas is about 25%. The electrolytic aluminum flue gas comprises high-temperature gas generated by an anode in the electrolytic process and a large amount of mixed air, and the whole flue gas has the characteristics of large flow, small effective wind occupation ratio and high harmful substance concentration.
The temperature difference of the exhaust gas of different electrolysis plants is larger and is between 100 ℃ and 200 ℃ under the influence of mixed air and the sealing condition of an electrolysis tank, the temperature is obviously influenced by seasons, the temperature difference of 20 ℃ to 50 ℃ can exist in winter and summer, the common temperature is not high, and the waste heat recovery is difficult.
At present, only a few projects directly utilize a small part of low-temperature electrolytic aluminum flue gas waste heat to produce hot water for plant use, and the waste heat recovery rate is low and the economic benefit is poor.
Therefore, there is a need for a waste heat utilization system with high waste heat recovery and economic benefits.
The utility model is based on the organic Rankine cycle power generation technology, and can effectively solve the problems by recycling the waste heat of low-temperature electrolytic aluminum flue gas.
Disclosure of Invention
The utility model aims at: in order to overcome the problems in the prior art, the utility model discloses an electrolytic aluminum flue gas waste heat utilization system, which is based on an organic Rankine cycle power generation technology, and can effectively solve the problems by recycling low-temperature electrolytic aluminum flue gas waste heat.
The aim of the utility model is achieved by the following technical scheme:
an electrolytic aluminum flue gas waste heat utilization system, comprising: the flue gas waste heat recovery subsystem and the organic Rankine cycle power generation subsystem are connected through a pipeline; the flue gas waste heat recovery subsystem comprises: the electrolysis bath is communicated with the flue gas heat exchanger through a flue gas transmission pipeline, and the heat in the flue gas is absorbed by a heat exchange medium in the flue gas heat exchanger; the organic rankine cycle power generation subsystem includes: the system comprises a preheater, an evaporator, a turbine, a steam exhaust heater, a motor, a working medium cooling device and a working medium circulating pump, wherein a heat exchange medium outlet of the flue gas heat exchanger is sequentially communicated with heating pipelines of the evaporator and the preheater through pipelines, and heat sources are provided for the evaporator and the preheater by the heat exchange medium; the outlet end of the heating pipeline of the preheater is connected with a heat exchange medium inlet of the flue gas heat exchanger through a water supply pump, so that the heat exchange medium can absorb the flue gas again; the organic working medium in the heated pipelines of the preheater and the evaporator is changed into steam under the heated condition, the outlet end of the heated pipeline of the evaporator is communicated with the turbine machine, working medium steam is used for doing work in the turbine machine, and after the working medium is used for doing work in the turbine machine, the steam is sent into the steam exhaust heater through the cooling device and the working medium circulating pump after flowing through the steam exhaust heater, and then is sequentially sent into the heated pipelines of the preheater and the evaporator for circulation; and the turbine machine is externally connected with a motor, and the turbine machine drives the motor to finish power generation.
According to a preferred embodiment, the electrolytic aluminum flue gas waste heat utilization system further comprises: and the smoke purification subsystem is connected with a smoke outlet end on the smoke heat exchanger and is used for completing dust removal and acid removal treatment of smoke.
According to a preferred embodiment the flue gas cleaning subsystem comprises: the flue gas dust removal device, the flue gas induced draft fan, the flue gas desulfurization device and the chimney; and the inflowing smoke passes through the smoke dust removing device, the smoke induced draft fan and the smoke desulfurizing device in sequence and is discharged from the chimney.
According to a preferred embodiment, the flue gas waste heat recovery subsystem further comprises a regulating valve, wherein the regulating valve is arranged on a flue gas transmission pipeline between the electrolytic tank and the flue gas heat exchanger, and the air quantity is changed by controlling the opening of the valve of the regulating valve, so that the flue gas heat is controlled.
According to a preferred embodiment, the heat exchange medium in the flue gas heat exchanger is circulating desalted water, and the flue gas heat exchanger is externally connected with a water quality detection and water supplementing device.
According to a preferred embodiment, the flue gas heat exchanger is a fin tube heat exchanger or a light tube heat exchanger.
According to a preferred embodiment, the cooling device is an air cooling island for performing air cooling of the flowing steam.
According to a preferred embodiment the cooling device comprises a condenser and a circulating cooling water pump, which provides circulating cooling water to the condenser, through which water cooling of the steam flowing through is accomplished.
The foregoing inventive concepts and various further alternatives thereof may be freely combined to form multiple concepts, all of which are contemplated and claimed herein. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or all of the present disclosure.
The utility model has the beneficial effects that: the utility model adopts the secondary heat exchange circulation of the high-pressure desalted water and the organic working medium, can effectively absorb and utilize the low-temperature waste heat of the electrolytic aluminum flue gas, and compared with the direct use of the flue gas to directly heat the water vapor to do work and generate power, the utility model effectively improves the utilization rate of the waste heat and the power generation efficiency, and has obvious economic benefit improvement. And collect electrolytic aluminum and discharge fume, set up independent power generation system, do not exert an influence to original electrolytic aluminum production flow, it is comparatively nimble to operate.
Drawings
FIG. 1 is a block diagram of an embodiment of the electrolytic aluminum flue gas waste heat utilization power generation system of the present utility model;
FIG. 2 is a block diagram of another embodiment of the electrolytic aluminum flue gas waste heat utilization power generation system of the present utility model;
the system comprises a 1-electrolytic tank, a 2-regulating valve, a 3-flue gas heat exchanger, a 4-evaporator, a 5-preheater, a 6-turbine machine, a 7-exhaust steam heater, an 8-motor, a 9-feed pump, a 10-working medium circulating pump, an 11-air cooling island, a 12-condenser, a 13-circulating cooling water pump, a 14-flue gas dust removal device, a 15-flue gas induced draft fan, a 16-flue gas desulfurization device and a 17-chimney.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present utility model, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, in the present utility model, if a specific structure, connection relationship, position relationship, power source relationship, etc. are not specifically written, the structure, connection relationship, position relationship, power source relationship, etc. related to the present utility model can be known by those skilled in the art without any creative effort.
Example 1:
referring to fig. 1, there is shown an electrolytic aluminum flue gas waste heat utilization system including: the system comprises a flue gas waste heat recovery subsystem, an organic Rankine cycle power generation subsystem and a flue gas purification subsystem.
The flue gas waste heat recovery subsystem is used for recovering the waste heat of the electrolytic aluminum flue gas and heating the high-pressure circulating water. The organic Rankine cycle power generation subsystem is used for absorbing heat of high-pressure circulating water, heating an organic working medium to generate steam for power generation, and cooling the working organic working medium steam for circulation. The flue gas purification subsystem is used for removing dust and desulfurizing the heat exchanged electrolytic aluminum flue gas, and discharging the flue gas after reaching standards.
Preferably, the flue gas waste heat recovery subsystem comprises: an electrolytic tank 1 and a flue gas heat exchanger 3. The electrolytic tank 1 is communicated with the flue gas heat exchanger 3 through a flue gas transmission pipeline, and the heat in the flue gas is absorbed and utilized by a heat exchange medium in the flue gas heat exchanger 3.
Preferably, the flue gas waste heat recovery subsystem further comprises a regulating valve 2, wherein the regulating valve 2 is arranged on a flue gas transmission pipeline between the electrolytic tank 1 and the flue gas heat exchanger 3, and the air quantity is changed by controlling the valve opening of the regulating valve 2, so that the flue gas heat is controlled.
When the flue gas waste heat utilization system fails, the temperature of the flue gas can be reduced by adjusting the regulating valve 2 to enter the flue gas dust removal device 14, so that the normal operation of the electrolytic aluminum production line is ensured. And no phase change occurs after the heat exchange medium (high-pressure circulating water) in the flue gas heat exchanger 3 is heated.
Preferably, the high-pressure circulating water is desalted water, and a corresponding water quality detection and water supplementing device is attached. The temperature of the discharged smoke after heat exchange of the smoke heat exchanger 3 should meet the requirements of subsequent smoke dust removal and desulfurization.
Preferably, the flue gas heat exchanger 3 may be provided as a single or multiple heat exchangers depending on site restrictions and flue gas duct arrangements. Preferably, the flue gas heat exchanger 3 may be selected as a fin tube heat exchanger or a light tube heat exchanger.
Preferably, the organic rankine cycle power generation subsystem comprises: a preheater 5, an evaporator 4, a turbine 6, a steam exhaust heater 7, a motor 8, a working medium cooling device and a working medium circulating pump 10.
The heat exchange medium outlet of the flue gas heat exchanger 3 is sequentially communicated with heating pipelines of the evaporator 4 and the preheater 5 through pipelines and is used for providing heat sources for the evaporator 4 and the preheater 5; and flows back to the flue gas heat exchanger 3 through the water feed pump 9 to realize the heat absorption of the heat exchange medium to the flue gas.
The heated pipeline of the preheater 5 is communicated with the heated pipeline of the evaporator 4, and the organic working medium in the heated pipeline of the preheater 5 and the evaporator 4 becomes steam under the heated condition.
The outlet end of a heated pipeline of the evaporator 4 is communicated with the turbine machine 6, working medium steam is used for doing work in the turbine machine 6, and the steam after doing work in the turbine machine 6 flows through the exhaust steam heater 7 and then is sent into the exhaust steam heater 7 through a cooling device and a working medium circulating pump and then sequentially sent into the heated pipelines of the preheater 5 and the evaporator 4 for circulation.
Further, the turbine 6 is externally connected with a motor 8, and the turbine 6 drives the motor 8 to finish power generation.
In the steam exhaust heater 7, the working organic working medium steam exchanges heat with the cooled organic working medium, so that the working medium steam condensation and the circulating wage preheating are realized.
Preferably, as shown in fig. 1, the cooling device may be an air cooling island 11 for performing air cooling of the flowing steam.
Preferably, as shown in fig. 2, the cooling device may include a condenser 12 and a circulating cooling water pump 13, wherein the circulating cooling water pump 13 provides circulating cooling water for the condenser 12, and water cooling of the steam flowing through the condenser 12 is completed.
Preferably, the flue gas purification subsystem is connected with a flue gas outlet end on the flue gas heat exchanger 3 and is used for completing dust removal and acid removal treatment of flue gas.
Further, the flue gas cleaning subsystem comprises: a flue gas dust removal device 14, a flue gas induced draft fan 15, a flue gas desulfurization device 16 and a chimney 17. The inflowing flue gas passes through the flue gas dust removal device 14, the flue gas induced draft fan 15 and the flue gas desulfurization device 16 in sequence and is discharged from the chimney 17.
Preferably, the desulfurization unit 16 may perform desulfurization and deacidification treatment by a method such as dry desulfurization, wet desulfurization or semi-dry desulfurization.
The utility model solves the problems of low utilization rate of low-temperature flue gas of electrolytic aluminum and the like. The utility model adopts the secondary heat exchange circulation of the high-pressure desalted water and the organic working medium, can effectively absorb and utilize the low-temperature waste heat of the electrolytic aluminum flue gas, and compared with the direct use of the flue gas to directly heat the water vapor to do work and generate power, the utility model effectively improves the utilization rate of the waste heat and the power generation efficiency, and has obvious economic benefit improvement. And collect electrolytic aluminum and discharge fume, set up independent power generation system, do not exert an influence to original electrolytic aluminum production flow, it is comparatively nimble to operate.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (8)
1. An electrolytic aluminum flue gas waste heat utilization system, which is characterized by comprising: the flue gas waste heat recovery subsystem and the organic Rankine cycle power generation subsystem are connected through a pipeline;
the flue gas waste heat recovery subsystem comprises: the device comprises an electrolytic tank (1) and a flue gas heat exchanger (3), wherein the electrolytic tank (1) is communicated with the flue gas heat exchanger (3) through a flue gas transmission pipeline, and the heat in the flue gas is absorbed by a heat exchange medium in the flue gas heat exchanger (3);
the organic rankine cycle power generation subsystem includes: a preheater (5), an evaporator (4), a turbine machine (6), a steam exhaust heater (7), a motor (8), a working medium cooling device and a working medium circulating pump (10),
the heat exchange medium outlet of the flue gas heat exchanger (3) is sequentially communicated with the heating pipelines of the evaporator (4) and the preheater (5) through pipelines, and the heat exchange medium provides heat sources for the evaporator (4) and the preheater (5); the outlet end of the heating pipeline of the preheater (5) is connected with the heat exchange medium inlet of the flue gas heat exchanger (3) through a water supply pump (9) so as to realize heat absorption of the heat exchange medium to the flue gas;
the device comprises a preheater (5), a heating pipeline of the preheater (5) and a heating pipeline of an evaporator (4), wherein an organic working medium in the heating pipeline of the preheater (5) and the evaporator (4) becomes steam under a heating condition, an outlet end of the heating pipeline of the evaporator (4) is communicated with a turbine machine (6), working is performed in the turbine machine (6) by the working medium steam, and after the working is performed in the turbine machine (6), the steam flows through a steam exhaust heater (7) and then is sent into the steam exhaust heater (7) through a cooling device and a working medium circulating pump (10) and then sequentially sent into the heating pipelines of the preheater (5) and the evaporator (4) for circulation;
and the turbine (6) is externally connected with a motor (8), and the turbine (6) drives the motor (8) to finish power generation.
2. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, further comprising: the flue gas purification subsystem is connected with a flue gas outlet end on the flue gas heat exchanger (3) and is used for completing dust removal and acid removal treatment of flue gas.
3. The electrolytic aluminum flue gas waste heat utilization system of claim 2, wherein the flue gas cleaning subsystem comprises: a flue gas dust removal device (14), a flue gas induced draft fan (15), a flue gas desulfurization device (16) and a chimney (17);
the inflowing flue gas passes through the flue gas dust removal device (14), the flue gas induced draft fan (15) and the flue gas desulfurization device (16) in sequence and is discharged from the chimney (17).
4. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, wherein the flue gas waste heat recovery subsystem further comprises a regulating valve (2), the regulating valve (2) is arranged on a flue gas transmission pipeline between the electrolytic tank (1) and the flue gas heat exchanger (3), and the air quantity is changed by controlling the valve opening of the regulating valve (2), so as to control the flue gas heat.
5. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, wherein the heat exchange medium in the flue gas heat exchanger (3) is circulating desalted water, and the flue gas heat exchanger (3) is externally connected with a water quality detection and water supplementing device.
6. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, wherein the flue gas heat exchanger (3) is a fin-tube heat exchanger or a light tube heat exchanger.
7. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, wherein the cooling means is an air cooling island (11) for performing air cooling of the flowing steam.
8. The electrolytic aluminum flue gas waste heat utilization system according to claim 1, wherein the cooling device comprises a condenser (12) and a circulating cooling water pump (13), the circulating cooling water pump (13) provides circulating cooling water for the condenser (12), and water cooling of steam flowing through is completed through the condenser (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237620.8U CN219798020U (en) | 2023-05-22 | 2023-05-22 | Electrolytic aluminum flue gas waste heat utilization system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321237620.8U CN219798020U (en) | 2023-05-22 | 2023-05-22 | Electrolytic aluminum flue gas waste heat utilization system |
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| Publication Number | Publication Date |
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| CN219798020U true CN219798020U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321237620.8U Active CN219798020U (en) | 2023-05-22 | 2023-05-22 | Electrolytic aluminum flue gas waste heat utilization system |
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| Country | Link |
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| CN (1) | CN219798020U (en) |
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- 2023-05-22 CN CN202321237620.8U patent/CN219798020U/en active Active
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