CN211851944U - Power generation system for recovering waste heat of electrolytic cell - Google Patents
Power generation system for recovering waste heat of electrolytic cell Download PDFInfo
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- CN211851944U CN211851944U CN201922140855.5U CN201922140855U CN211851944U CN 211851944 U CN211851944 U CN 211851944U CN 201922140855 U CN201922140855 U CN 201922140855U CN 211851944 U CN211851944 U CN 211851944U
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Abstract
The utility model relates to a power generation system for electrolysis trough waste heat recovery, include: the gas compressor, the heat conduction device arranged outside the electrolytic bath, the primary circulation turbine, the primary circulation generator and the primary circulation cooler are arranged on the outer side of the electrolytic bath; the gas compressor is connected with a heat conduction device through a pipeline, the heat conduction device is connected with a first-stage circulating turbine pipeline, a first-stage circulating turbine is connected with a first-stage circulating cooler through a pipeline, the first-stage circulating cooler is connected with the gas compressor through a pipeline, and a first-stage circulating generator is connected with a first-stage circulating turbine shaft. The secondary waste heat generator set comprises a circulating pump, a secondary circulating turbine, a secondary circulating generator and a secondary circulating cooler; the circulating pump is connected with a pipeline of a first-stage circulating cooler, the first-stage circulating cooler is connected with a pipeline of a second-stage circulating turbine, the second-stage circulating turbine is connected with a pipeline of a second-stage circulating cooler, the second-stage circulating cooler is connected with a pipeline of the circulating pump, and the second-stage circulating turbine is connected with a shaft of a second-stage generator. The utilization rate of the waste heat of the electrolytic cell is improved.
Description
Technical Field
The utility model relates to a waste heat power generation technical field especially relates to a power generation system for electrolysis trough waste heat recovery.
Background
The current capacity of electrolytic aluminum in China is more than 3000 ten thousand tons, and the electrolytic method is mostly adopted for production. About 50% of heat dissipation loss exists in the production process of the aluminum electrolysis cell, the heat is dissipated to the atmospheric environment mainly in a radiation and convection mode, and at present, no better heat recycling method exists.
In the prior art, heat exchange equipment is generally and directly arranged on the side wall of an electrolytic cell, partial heat is taken out of the electrolytic cell by utilizing fluid, waste heat utilization is realized, and the utilization mode is single and the efficiency is not high. Most of the waste heat can not be utilized and causes heat pollution to the environment.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the present invention provides a power generation system for recovering waste heat of an electrolytic cell, aiming to solve the problem of low utilization efficiency of the waste heat of the electrolytic cell in the prior art.
The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted as follows:
a power generation system for electrolysis cell waste heat recovery, comprising:
the first-stage waste heat generator set comprises a gas compressor, a heat conduction device arranged outside the electrolytic bath, a first-stage circulating turbine, a first-stage circulating generator and a first-stage circulating cooler;
the outlet end of the gas compressor is connected with the inlet end pipeline of the heat conduction device, the outlet end of the heat conduction device is connected with the input end pipeline of the primary circulation turbine, the output end of the primary circulation turbine is connected with the first inlet end pipeline of the primary circulation cooler, the first outlet end of the primary circulation cooler is connected with the inlet end pipeline of the gas compressor, and the primary circulation generator is connected with the primary circulation turbine shaft;
the secondary waste heat generator set comprises a circulating pump, a secondary circulating turbine, a secondary circulating generator and a secondary circulating cooler;
the outlet end of the circulating pump is connected with a second inlet end pipeline of the first-stage circulating cooler, a second outlet end of the first-stage circulating cooler is connected with an inlet end pipeline of the second-stage circulating turbine, an outlet end of the second-stage circulating turbine is connected with an inlet end pipeline of the second-stage circulating cooler, an outlet end of the second-stage circulating cooler is connected with an inlet end pipeline of the circulating pump, and the second-stage circulating turbine is connected with the shaft of the second-stage generator.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that a channel through which a first working medium passes is arranged in the heat conduction device.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the first working medium is gas.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the heat conduction device is a metal plate.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the heat conduction device is arranged in a heat insulation layer of the electrolytic cell.
The power generation system for recovering the waste heat of the electrolytic cell further comprises a thermoelectric module, and the thermoelectric module is arranged on the surface of one side of the heat conduction device, which is close to the inside of the electrolytic cell.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the heat preservation layer comprises an electrolytic cell side wall heat preservation layer, a molten pool heat preservation layer at the bottom of the electrolytic cell and a heat preservation ash layer at the upper part of the electrolytic cell.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that thermoelectric modules are arranged on two sides of the heat conduction device in the heat insulation ash layer.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the secondary waste heat power generator set comprises a second working medium, and the second working medium is a binary working medium.
The power generation system for recovering the waste heat of the electrolytic cell is characterized in that the second working medium is tetrafluoroethane or Freon.
Has the advantages that: the utility model provides a power generation system for electrolysis trough waste heat recovery utilizes the waste heat through the mode that adopts brayton cycle and organic rankine cycle to unite, promotes thermoelectric conversion's efficiency, has improved waste heat utilization rate.
Drawings
FIG. 1 is a schematic diagram of a power generation system for recovering waste heat of an electrolytic cell provided by an embodiment of the invention.
FIG. 2 is a cross-sectional view of an electrolytic cell with a heat conducting device and a thermoelectric module disposed therein, the power generation system for recovering waste heat of the electrolytic cell provided by an embodiment of the present invention.
FIG. 3 is a comparison of a cell with and without a heat recovery system.
FIG. 4 is a schematic diagram of the heat transfer process of the electrolytic cell.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connect" or "connect" as used herein includes both direct and indirect connections (connections), unless otherwise specified. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate the orientation or positional relationship as used in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the utility model discloses a power generation system for electrolysis trough waste heat recovery, include: the primary waste heat generator set 10 comprises a gas compressor 110, a heat conduction device 120 arranged outside the electrolytic bath 30, a primary circulating turbine 130, a primary circulating generator 140 and a primary circulating cooler 150; the position of the heat conducting device 120 can be set according to actual needs, and is usually set at the bottom and/or the side of the electrolytic cell. The exterior here is in relation to the interior space of the cell.
The outlet end of the gas compressor 110 is connected to the inlet end of the heat conduction device 120, the outlet end of the heat conduction device 120 is connected to the input end of the primary circulation turbine 130, the output end of the primary circulation turbine 130 is connected to the first inlet end of the primary circulation cooler 150, the first outlet end of the primary circulation cooler 150 is connected to the inlet end of the gas compressor 110, and the primary circulation generator 140 is connected to the primary circulation turbine 130;
the secondary waste heat generator set 20 comprises a circulating pump 210, a secondary circulating turbine 220, a secondary circulating generator 230 and a secondary circulating cooler 240;
the outlet end of the circulating pump 210 is connected with the second inlet end of the first-stage circulation cooler 150 through a pipeline, the second outlet end of the first-stage circulation cooler 150 is connected with the inlet end of the second-stage circulation turbine 220 through a pipeline, the outlet end of the second-stage circulation turbine 220 is connected with the inlet end of the second-stage circulation cooler 240 through a pipeline, the outlet end of the second-stage circulation cooler 240 is connected with the inlet end of the circulating pump 210 through a pipeline, and the second-stage circulation turbine 220 is connected with the second-stage generator 230 through a shaft.
In this embodiment, the one-level waste heat power generation unit adopts brayton cycle, adopts gas as heat transfer medium, and the second grade waste heat power generation unit adopts organic rankine cycle, through carrying out the second grade to the waste heat and retrieving, has improved whole waste heat utilization efficiency. Wherein, the first Brayton cycle can adopt various gases, such as nitrogen, carbon dioxide, air and the like. Because a large number of exposed copper bars, electrodes and the like are arranged around the electrolytic cell, if liquid is used as a heat exchange working medium, once leakage occurs, the electricity utilization safety of the electrolytic cell can be threatened. And the gas is adopted as the heat exchange working medium, so that the damage to the electrolytic cell caused by the leakage of the heat exchange working medium can be well avoided.
In one or more embodiments, the heat conducting device 120 is configured to conduct heat released by the electrolytic cell to the working medium of the primary waste heat power generator set, so as to heat the working medium. The heat conducting device 120 may be a metal plate with good heat conductivity, such as a copper plate, in which a through channel is formed in the middle of the copper plate, and a heat exchange working medium can pass through the through channel. Of course, the heat conducting device may also adopt a mode of arranging a heat conducting pipeline between two layers of metal copper plates, for example, to realize the recovery of the heat released by the electrolytic cell.
In the embodiment, in the brayton cycle process, a gas working medium used for heat exchange, such as carbon dioxide gas, is pressurized by the gas compressor 110 to provide pressure for the cycle, and meanwhile, the temperature of the gas is increased in the compression process, and then the pressurized gas enters the heat conducting device (heat transfer channel) arranged outside the electrolytic cell to absorb heat released from the electrolytic cell, so that part of the heat originally lost to the environment is recovered. The heat exchange gas (working medium) flows out from the heat transfer channel, the temperature is further increased, the heat exchange gas enters the primary circulation turbine, the temperature and the pressure of the heat exchange gas are both reduced after the heat exchange gas is expanded to do work and output shaft work, but the temperature is still higher, the heat exchange gas returns to the inlet of the gas compressor after flowing through the primary circulation cooler to be cooled and transferring the heat to the secondary waste heat generator set, and the next circulation is carried out.
Because the heat conductivity of the gas is poor, the original temperature of the original electrolytic cell is not greatly influenced, and the normal operation of the electrolytic cell is not influenced. Meanwhile, the heat exchange process of heat exchange gas in the heat conduction device can be effectively regulated and controlled by adjusting the arrangement position, the heat exchange gas flow, the inlet temperature and the like of the heat conduction device.
In the embodiment, the two-stage waste heat generator set adopts an organic Rankine cycle, and the cycle process is as follows: the second working medium is pumped into the first-stage circulating cooler by the circulating pump to absorb heat released by the first-stage circulating cooler, then is evaporated and heated, then enters the second-stage turbine to do work by expansion, enters the second-stage circulating cooler after being cooled and depressurized to be cooled and condensed, and then is sent to the first-stage circulating cooler by the circulating pump again to carry out next circulation. Wherein, the second working medium can be a binary working medium, such as tetrafluoroethane or freon.
In one or more embodiments, as shown in fig. 2, the heat conducting device 120 is a heat conducting pipeline with a smooth surface and a through middle portion, and is disposed in the bottom insulating layer (molten pool insulating layer) of the electrolytic cell and the insulating layer on the side wall of the electrolytic cell, and the heat conducting device is disposed in the insulating layer, so that the heat exchange of the heat conducting device can be prevented from being relatively stable, and large temperature fluctuation can not occur, which is beneficial to the stable operation of the power generation equipment.
In one embodiment, a thermoelectric module 160 is further disposed on the heat conducting device 120, and the thermoelectric module 160 is disposed close to the heat conducting device 120, as shown in fig. 2, in the side wall insulating layer of the electrolytic cell, the side of the vertically disposed heat conducting device close to the inside of the electrolytic cell is provided with the thermoelectric module, and the upper surface (close to the inside of the electrolytic cell) of the horizontally disposed heat conducting device in the insulating layer at the bottom of the electrolytic cell is provided with the thermoelectric module, that is, the thermoelectric module is disposed on the heated surface of the heat conducting device.
In one embodiment, the thermal insulation ash layer 170 is disposed at the opening of the electrolytic cell, and the thermal conduction device and the thermoelectric modules 160 disposed at both sides of the thermal conduction device are disposed in the thermal insulation ash layer 170, so that the heat emitted from the opening of the electrolytic cell can be fully utilized, and the maximum heat recovery efficiency can be achieved.
In the embodiment, the thermoelectric module is directly laid on the heating surface of the heat conducting device, so that by utilizing the internal and external temperature difference formed in the gas heat exchange process, the thermoelectric material can directly convert part of heat into electric energy, and the thermoelectric conversion efficiency of the system can be further improved; in addition, in an extreme case, for example, when the electrolytic cell starts to heat up, the thermoelectric module may also be powered, so that the thermoelectric module may run in reverse, and reversely deliver the heat of the gas in the heat conduction device (heat transfer pipe) to the electrolytic cell side, which may play an active thermal insulation role for the electrolytic cell, as shown in the second operation mode in fig. 4.
As shown in fig. 3 to 4, part a of fig. 3 shows that the heat conduction means and the thermoelectric module are provided in the insulating layer of the electrolytic cell, and part B shows that the heat conduction means and the thermoelectric module are not provided. Namely, part A shows an electrolytic cell with waste heat recovery, and part B shows an electrolytic cell without waste heat recovery. Wherein the bath in figure 4 is referred to herein as an electrolysis cell. The working mode is that partial heat is dissipated to the air after the heat dissipation of the molten pool is recovered by two stages of heat under normal conditions.
To sum up, the utility model provides a power generation system for electrolysis trough waste heat recovery, include: the first-stage waste heat generator set comprises a gas compressor, a heat conduction device arranged outside the electrolytic bath, a first-stage circulating turbine, a first-stage circulating generator and a first-stage circulating cooler;
the outlet end of the gas compressor is connected with the inlet end pipeline of the heat conduction device, the outlet end of the heat conduction device is connected with the input end pipeline of the primary circulation turbine, the output end of the primary circulation turbine is connected with the first inlet end pipeline of the primary circulation cooler, the first outlet end of the primary circulation cooler is connected with the inlet end pipeline of the gas compressor, and the primary circulation power generation is connected with the primary circulation turbine shaft;
the secondary waste heat generator set comprises a circulating pump, a secondary circulating turbine, a secondary circulating generator and a secondary circulating cooler; the outlet end of the circulating pump is connected with a second inlet end pipeline of the first-stage circulating cooler, a second outlet end of the first-stage circulating cooler is connected with an inlet end pipeline of the second-stage circulating turbine, an outlet end of the second-stage circulating turbine is connected with an inlet end pipeline of the second-stage circulating cooler, an outlet end of the second-stage circulating cooler is connected with an inlet end pipeline of the circulating pump, and the second-stage circulating turbine is connected with the shaft of the second-stage generator. By adopting the combined mode of Brayton cycle and organic Rankine cycle to utilize the waste heat, the efficiency of thermoelectric conversion is improved, and the waste heat utilization rate is improved.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. A power generation system for electrolysis cell waste heat recovery, comprising:
the first-stage waste heat generator set comprises a gas compressor, a heat conduction device arranged outside the electrolytic bath, a first-stage circulating turbine, a first-stage circulating generator and a first-stage circulating cooler;
the outlet end of the gas compressor is connected with the inlet end pipeline of the heat conduction device, the outlet end of the heat conduction device is connected with the input end pipeline of the primary circulation turbine, the output end of the primary circulation turbine is connected with the first inlet end pipeline of the primary circulation cooler, the first outlet end of the primary circulation cooler is connected with the inlet end pipeline of the gas compressor, and the primary circulation generator is connected with the primary circulation turbine shaft;
the secondary waste heat generator set comprises a circulating pump, a secondary circulating turbine, a secondary circulating generator and a secondary circulating cooler;
the outlet end of the circulating pump is connected with a second inlet end pipeline of the first-stage circulating cooler, a second outlet end of the first-stage circulating cooler is connected with an inlet end pipeline of the second-stage circulating turbine, an outlet end of the second-stage circulating turbine is connected with an inlet end pipeline of the second-stage circulating cooler, an outlet end of the second-stage circulating cooler is connected with an inlet end pipeline of the circulating pump, and the second-stage circulating turbine is connected with a second-stage circulating generator shaft.
2. The power generation system for electrolysis cell waste heat recovery according to claim 1, wherein the heat conduction device is internally provided with a channel for the first working medium to pass through.
3. The power generation system for electrolysis cell waste heat recovery according to claim 1, wherein the heat conducting means is disposed in an insulation layer of the electrolysis cell.
4. The power generation system for electrolysis cell waste heat recovery according to claim 1, further comprising a thermoelectric module disposed on the heated surface of the heat conducting means.
5. The power generation system for electrolysis cell waste heat recovery according to claim 3, wherein the insulation layer comprises an electrolysis cell side wall insulation layer, a molten bath insulation layer at the bottom of the electrolysis cell, and an insulation ash layer at the upper part of the electrolysis cell.
6. The power generation system for electrolysis cell waste heat recovery according to claim 5, wherein the thermal conduction means in the insulating ash layer is provided with thermoelectric modules on both sides.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111042886A (en) * | 2019-12-03 | 2020-04-21 | 深圳大学 | Power generation system for recovering waste heat of electrolytic cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111042886A (en) * | 2019-12-03 | 2020-04-21 | 深圳大学 | Power generation system for recovering waste heat of electrolytic cell |
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