CN217953243U - High-temperature flue gas waste heat recovery system - Google Patents
High-temperature flue gas waste heat recovery system Download PDFInfo
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- CN217953243U CN217953243U CN202221563657.5U CN202221563657U CN217953243U CN 217953243 U CN217953243 U CN 217953243U CN 202221563657 U CN202221563657 U CN 202221563657U CN 217953243 U CN217953243 U CN 217953243U
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Abstract
The utility model discloses a high-temperature flue gas waste heat recovery system, which comprises a main waste heat recovery system, a terminal heat consumption system and an auxiliary waste heat recovery system; the main waste heat recovery system is used for recovering the flue gas waste heat of the boiler, exchanging heat to the heat storage fluid and then guiding the heat storage fluid after heat exchange into the terminal heat consumption system; the terminal heat consumption system is used for recycling the heat storage fluid after heat exchange; and when the recycling amount of the heat storage fluid by the terminal heat consumption system reaches a threshold value, the auxiliary waste heat recovery system is used for reducing the flow of the smoke entering the main waste heat recovery system. When the recycling amount of the heat storage fluid by the terminal heat consumption system reaches a threshold value, the threshold value can be used as an index of a heat exchanger in the main waste heat recovery system close to an overheat state, and the auxiliary waste heat recovery system is further started to absorb part of smoke so as to reduce the smoke entering the main waste heat recovery system; when the recycling amount of the heat storage fluid by the terminal heat consumption system is smaller than the threshold value, the auxiliary waste heat recovery system can be closed.
Description
Technical Field
The utility model relates to a high temperature flue gas waste heat recovery system belongs to waste heat recovery technical field.
Background
The steel plant process line needs to consume heat to maintain the normal operation of each process. Meanwhile, a large amount of heat is taken away without effectively utilizing high-temperature flue gas generated by steelmaking, so that energy waste is caused. The waste heat in the flue gas is generally recovered by a high-temperature flue gas waste heat recovery system.
In the prior art, a high-temperature flue gas waste heat recovery system generally comprises one or more heat exchangers connected in series by adopting a single pipeline, and the heat of the heat exchangers is conducted among different media, so that the purpose of recovery is achieved.
However, the above scheme still has a problem, because the waste heat of the boiler flue gas has certain instability, when the waste heat of the boiler flue gas exceeds the temperature at which the heat exchanger normally works, the single-pipeline high-temperature flue gas waste heat recovery system completely receives the waste heat of the boiler flue gas, once the heat of the heat storage fluid cannot be utilized in time, the heat storage fluid in the heat exchanger is easily overheated (for example, oil can be over-burnt), and further the damage of the heat exchanger is caused to a certain extent.
SUMMERY OF THE UTILITY MODEL
For solving the deficiency of the prior art, the utility model aims to provide a high temperature flue gas waste heat recovery system has solved the overheated problem that damages the heat exchanger of flue gas among the prior art.
In order to realize the above object, the utility model adopts the following technical scheme:
a high-temperature flue gas waste heat recovery system comprises a main waste heat recovery system, a terminal heat consumption system and an auxiliary waste heat recovery system;
the main waste heat recovery system is used for recovering the flue gas waste heat of the boiler, exchanging heat to the heat storage fluid and then guiding the heat storage fluid after heat exchange into the terminal heat consumption system;
the terminal heat consumption system is used for recycling the heat storage fluid after heat exchange;
and when the recycling amount of the heat storage fluid by the terminal heat consumption system reaches a threshold value, the auxiliary waste heat recovery system is used for reducing the flow of smoke entering the main waste heat recovery system.
As a preferred scheme of the utility model, the main waste heat recovery system comprises a main pipeline and a high-temperature flue gas heat exchanger;
the main pipeline is communicated with a boiler flue gas outlet and a hot fluid cavity of the high-temperature flue gas heat exchanger, and the heat storage fluid is arranged in a cold fluid cavity of the high-temperature flue gas heat exchanger.
As a preferred scheme of the utility model, the high temperature flue gas heat exchanger is a gas-oil type dividing wall type heat exchanger.
As an optimized scheme of the utility model, still include back oil pipe way, it inserts high temperature gas heater's cold fluid chamber to return oil pipe way to constitute the fluidic circulation circuit of heat-retaining.
As a preferred scheme of the utility model, still include the circulating pump, the circulating pump is used for providing power to circulation circuit.
As a preferred scheme of the utility model, the oil return pipeline is provided with an oil storage device;
when the heat storage fluid in the oil return pipeline is heated and expanded, the oil storage device is used for reducing the pressure of the heat storage fluid on the inner wall of the oil return pipeline.
As a preferred scheme of the utility model, the top of oil storage device communicates with the atmosphere.
As a preferred aspect of the present invention, the terminal heat consumption system includes at least one terminal heat exchanger;
the hot fluid cavity of the at least one terminal heat exchanger is connected into the circulation loop to be used as a main path or a branch path of the circulation loop;
and at least one terminal heat consumption pipeline is connected to the cold fluid cavity of each terminal heat exchanger to form an energy consumption loop.
As a preferred scheme of the utility model, the auxiliary waste heat recovery system comprises an auxiliary pipeline and a chimney;
one end of the auxiliary pipeline is communicated with a main pipeline between the boiler flue gas outlet and the high-temperature flue gas heat exchanger;
the other end of the auxiliary pipeline is sequentially communicated with the chimney and the hot fluid cavity of the high-temperature flue gas heat exchanger along the direction from the boiler flue gas outlet to the high-temperature flue gas heat exchanger, and the auxiliary pipeline is provided with a valve.
As a preferred embodiment of the present invention, the oil storage device is located at an upstream of the suction port of the circulation pump.
The utility model discloses the beneficial effect who reaches:
in the utility model, when the recycling amount of the heat storage fluid by the terminal heat consumption system reaches the threshold value, the threshold value can be used as the index of the heat exchanger in the main waste heat recovery system close to the overheat state, and the auxiliary waste heat recovery system is further opened to absorb part of the flue gas so as to reduce the flue gas entering the main waste heat recovery system; when the recycling amount of the heat storage fluid by the terminal heat consumption system is smaller than a threshold value, the auxiliary waste heat recovery system can be closed.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of a high-temperature flue gas waste heat recovery system provided by the present invention;
fig. 2 is a schematic structural diagram of another preferred embodiment of the high-temperature flue gas waste heat recovery system provided by the present invention.
The meaning of the reference symbols in the figures:
10. a main waste heat recovery system; 20. a terminal heat consumption system; 30. a secondary waste heat recovery system;
1. a high temperature flue gas heat exchanger; 2. a boiler; 3. an oil storage device; 4. a circulation pump; 5. a terminal heat exchanger; 6. a terminal heat-consuming pipeline; 7. a main pipeline; 8. an oil return line; 9. a secondary pipeline; 13. and (4) a chimney.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and fig. 2, the embodiment discloses a high-temperature flue gas waste heat recovery system, which includes a main waste heat recovery system 10, a terminal heat consumption system 20, and an auxiliary waste heat recovery system 30; the main waste heat recovery system 10 is used for recovering the flue gas waste heat of the boiler 2, exchanging heat to the heat storage fluid, and then guiding the heat storage fluid after heat exchange into the terminal heat consumption system 20; the terminal heat consumption system 20 is used for recycling heat storage fluid after heat exchange; when the recycling amount of the heat storage fluid by the terminal heat consumption system 20 reaches a threshold value, the auxiliary waste heat recovery system 30 is used for reducing the flow rate of the flue gas entering the main waste heat recovery system 10.
When the recycling amount of the heat storage fluid by the terminal heat consumption system 20 reaches a threshold value, that is, the recycling amount of the heat storage fluid by the terminal heat consumption system 20 reaches a limit, the heat of the heat storage fluid cannot be transferred continuously, so that the heat of the heat storage fluid is increased, and the problem of overburning of the heat storage fluid is easily caused.
In the present invention, when the recycling amount of the heat storage fluid by the terminal heat consumption system 20 reaches the threshold value, the threshold value can be used as an index of the heat exchanger in the main waste heat recovery system 10 approaching to the overheat state, and the auxiliary waste heat recovery system 30 is further opened to absorb part of the flue gas, so as to reduce the flue gas entering the main waste heat recovery system 10; when the amount of the heat storage fluid recycled by the terminal heat consumption system 20 is less than the threshold, the auxiliary waste heat recovery system 30 may be turned off.
In the present embodiment, the main waste heat recovery system 10 includes a main pipeline 7 and a high-temperature flue gas heat exchanger 1; the main pipeline 7 conducts a flue gas outlet of the boiler 2 and a hot fluid cavity of the high-temperature flue gas heat exchanger 1, and the heat storage fluid is arranged in a cold fluid cavity of the high-temperature flue gas heat exchanger 1.
In the present embodiment, the high temperature flue gas heat exchanger 1 is a gas-oil type dividing wall type heat exchanger.
In this embodiment, the system further includes an oil return pipeline 8, and the oil return pipeline 8 is connected to the cold fluid cavity of the high-temperature flue gas heat exchanger 1 to form a circulation loop of the heat storage fluid.
In the present embodiment, a circulation pump 4 is further included, the circulation pump 4 being used to power the circulation loop.
In the present embodiment, the oil return line 8 is provided with an oil storage device 3; after the heat storage fluid in the oil return pipeline 8 is heated and expanded, the oil storage device 3 is used for reducing the pressure of the heat storage fluid on the inner wall of the oil return pipeline 8.
The volume expansion coefficient of the oil is high, the oil temperature of the pipeline rises, the volume of the oil expands, redundant oil enters the oil storage device 3, and the oil level rises; when the oil temperature of the pipeline is reduced, the volume is reduced, the oil in the oil storage device 3 enters the pipeline, and the oil level is reduced; the oil storage device 3 is provided with an oil supplementing port, and oil is added into the oil storage device when the system is in oil shortage; the oil storage device can play a role in buffering, and pressure change in the circulating pipeline is reduced.
In the present embodiment, the top end of the oil reservoir 3 is open to the atmosphere, and serves as a constant pressure point of the circulation to ensure a cavitation margin at the suction port of the circulation pump 4.
In the present embodiment, the terminal heat consumption system 20 comprises at least one terminal heat exchanger 5; the hot fluid cavity of the at least one terminal heat exchanger 5 is connected to the circulation loop to be used as a main path or a branch path of the circulation loop; at least one terminal heat dissipation pipeline 6 is connected to the cold fluid cavity of each terminal heat exchanger 5 to form a power dissipation loop.
The high-temperature flue gas heat exchanger 1 is led out through the oil return pipeline 8, so that the terminal heat exchangers 5 can be randomly connected in parallel between the oil return pipelines 8, the number of the terminal heat exchangers 5 can be freely added according to actual needs, and the capacity expansion is convenient; and one branch does not affect other branches when being failed or repaired.
In the present embodiment, the oil reservoir 3 is located upstream of the suction port of the circulation pump 4, and cavitation at the suction port of the pump can be prevented to extend the service life of the pump.
In an embodiment, the secondary waste heat recovery system 30 comprises a secondary pipeline 9 and a chimney 13; one end of the auxiliary pipeline 9 is communicated with a main pipeline between a flue gas outlet of the boiler 2 and the high-temperature flue gas heat exchanger 1; the other end of the auxiliary pipeline 9 is sequentially communicated with a chimney 13 and a hot fluid cavity of the high-temperature flue gas heat exchanger 1 along the direction from the flue gas outlet of the boiler 2 to the high-temperature flue gas heat exchanger 1, and the auxiliary pipeline 9 is provided with a valve.
When the heat required by the heat consumption terminal is reduced, the opening of the bypass valve of the secondary pipeline 9 is increased by the system, the bypass amount of the flue gas is increased, then the flue gas is directly discharged through the chimney 13, and the flow of the flue gas exchanging heat with the oil is reduced, so that the outlet oil temperature of the high-temperature heat exchanger is ensured to be stabilized in a proper range, and the oil is prevented from being burnt.
The working principle is as follows:
the flue gas of the boiler 2 enters a hot fluid cavity of the high-temperature flue gas heat exchanger 1 through a main pipeline 7 (at this time, the opening degree of a bypass valve of an auxiliary pipeline 9 is extremely small or closed), the flue gas waste heat of the high-temperature flue gas heat exchanger 1 is transferred into oil (heat storage fluid) in a cold fluid cavity from the hot fluid cavity, then the flue gas of the boiler 2 is discharged through the auxiliary pipeline 9 and a chimney 13, a circulating pump 4 drives the oil (heat storage fluid) to circularly flow in an oil return pipeline 8, the hot fluid cavity of one terminal heat exchanger 5 is directly connected in series to the oil return pipeline 8, the other terminal heat exchangers 5 are connected in series with the oil return pipeline 8, at this time, the terminal heat exchanger 5 can continuously convert the heat of the oil (heat storage fluid) into the heat of a medium in a terminal heat consumption pipeline 6, at this time, once the medium in the terminal heat consumption pipeline 6 reaches an absorption threshold value, for example, the medium is water, at this time, the water is boiled, at this time, an auxiliary waste heat recovery system 30 is opened, and the oil is prevented from being over-burned.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A high-temperature flue gas waste heat recovery system is characterized by comprising a main waste heat recovery system (10), a terminal heat consumption system (20) and an auxiliary waste heat recovery system (30);
the main waste heat recovery system (10) is used for recovering the waste heat of the flue gas of the boiler, exchanging heat to the heat storage fluid and then guiding the heat storage fluid after heat exchange into the terminal heat consumption system (20);
the terminal heat consumption system (20) is used for recycling heat storage fluid after heat exchange;
when the recycling amount of the heat storage fluid of the terminal heat consumption system (20) reaches a threshold value, the auxiliary waste heat recovery system (30) is used for reducing the flow rate of the smoke entering the main waste heat recovery system (10).
2. The high-temperature flue gas waste heat recovery system according to claim 1, wherein the main waste heat recovery system (10) comprises a main pipeline (7) and a high-temperature flue gas heat exchanger (1);
the main pipeline (7) is communicated with a boiler flue gas outlet and a hot fluid cavity of the high-temperature flue gas heat exchanger (1), and the heat storage fluid is arranged in a cold fluid cavity of the high-temperature flue gas heat exchanger (1).
3. The high-temperature flue gas waste heat recovery system according to claim 2,
the high-temperature flue gas heat exchanger (1) is a gas-oil type dividing wall type heat exchanger.
4. The high-temperature flue gas waste heat recovery system according to claim 2 or 3,
the heat storage device is characterized by further comprising an oil return pipeline (8), wherein the oil return pipeline (8) is connected into a cold fluid cavity of the high-temperature flue gas heat exchanger (1) to form a heat storage fluid circulation loop.
5. The high-temperature flue gas waste heat recovery system according to claim 4,
the circulating pump (4) is further included, and the circulating pump (4) is used for providing power for the circulating loop.
6. The high temperature flue gas waste heat recovery system of claim 5,
the oil return pipeline (8) is provided with an oil storage device (3);
and when the heat storage fluid in the oil return pipeline (8) is heated and expanded, the oil storage device (3) is used for reducing the pressure of the heat storage fluid on the inner wall of the oil return pipeline (8).
7. The high temperature flue gas waste heat recovery system of claim 6,
the top end of the oil storage device (3) is communicated with the atmosphere.
8. The high-temperature flue gas waste heat recovery system according to claim 4,
the terminal heat consumption system (20) comprises at least one terminal heat exchanger (5);
the hot fluid cavity of the at least one terminal heat exchanger (5) is connected into the circulation loop to be used as a main path or a branch path of the circulation loop;
the cold fluid cavity of each terminal heat exchanger (5) is connected with at least one terminal heat consumption pipeline (6) to form an energy consumption loop.
9. The high-temperature flue gas waste heat recovery system according to claim 2,
the auxiliary waste heat recovery system (30) comprises an auxiliary pipeline (9) and a chimney (13);
one end of the auxiliary pipeline (9) is communicated with a main pipeline between a boiler flue gas outlet and the high-temperature flue gas heat exchanger (1);
the other end of the auxiliary pipeline (9) is sequentially communicated with a chimney (13) and a hot fluid cavity of the high-temperature flue gas heat exchanger (1) along the direction from a boiler flue gas outlet to the high-temperature flue gas heat exchanger (1), and the auxiliary pipeline (9) is provided with a valve.
10. The high-temperature flue gas waste heat recovery system according to claim 6,
the oil storage device (3) is positioned at the upstream of the suction inlet of the circulating pump (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221563657.5U CN217953243U (en) | 2022-06-21 | 2022-06-21 | High-temperature flue gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221563657.5U CN217953243U (en) | 2022-06-21 | 2022-06-21 | High-temperature flue gas waste heat recovery system |
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| Publication Number | Publication Date |
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| CN217953243U true CN217953243U (en) | 2022-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221563657.5U Active CN217953243U (en) | 2022-06-21 | 2022-06-21 | High-temperature flue gas waste heat recovery system |
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| CN (1) | CN217953243U (en) |
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- 2022-06-21 CN CN202221563657.5U patent/CN217953243U/en active Active
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