CN118030231A - Waste heat recovery system and offshore operation equipment - Google Patents
Waste heat recovery system and offshore operation equipment Download PDFInfo
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- CN118030231A CN118030231A CN202410370717.9A CN202410370717A CN118030231A CN 118030231 A CN118030231 A CN 118030231A CN 202410370717 A CN202410370717 A CN 202410370717A CN 118030231 A CN118030231 A CN 118030231A
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- 239000002918 waste heat Substances 0.000 title claims abstract description 70
- 238000011084 recovery Methods 0.000 title claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000010248 power generation Methods 0.000 claims abstract description 49
- 230000017525 heat dissipation Effects 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 29
- 239000002912 waste gas Substances 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000013535 sea water Substances 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 17
- 230000004907 flux Effects 0.000 abstract description 13
- 230000005676 thermoelectric effect Effects 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005678 Seebeck effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
- F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The present invention relates to a waste heat recovery system and offshore operation equipment. The waste heat recovery system includes: an exhaust gas pipe, a thermal power generation device and a heat dissipation device; an exhaust gas pipe for discharging high temperature exhaust gas; the thermal power generation device comprises a hot end and a cold end; the hot end is attached to the outer wall surface of the waste gas pipeline; the heat radiating device is attached to the surface of the cold end of the thermal power generation device; the heat dissipation device is internally provided with a heat dissipation pipeline, and a liquid heat exchange medium is introduced into the heat dissipation pipeline. In the waste heat recovery system of the embodiment, the heat dissipation device is arranged at the cold end of the thermal power generation device, so that the hot end and the cold end of the thermal power generation device have a larger temperature difference, the whole heat flux of the waste heat recovery system is larger, the waste heat recovery efficiency is higher, and the economic benefit is higher.
Description
Technical Field
The invention relates to the technical field of heat recovery, in particular to a waste heat recovery system and offshore operation equipment.
Background
The thermoelectric generator converts circulating heat into electric energy by utilizing a seebeck effect (thermoelectric effect) caused by a temperature difference; the thermoelectric effect of the thermoelectric generator is utilized, waste heat is recovered through the thermoelectric generator in an electric energy form, and the thermoelectric generator has a very long development prospect under the current environmental policy.
The thermoelectric effect of the thermoelectric generator has a great deal of engineering application under specific environmental conditions, particularly in the field of ship/maritime/offshore platform engineering, a great deal of exhaust heat is carried by flue gas generated after combustion of petrochemical fuel and is discharged into the atmosphere, and the waste heat in the exhaust gas generated after combustion of the petrochemical fuel is recovered, so that the thermoelectric generator has great economic benefit and great environmental benefit.
However, the conventional thermoelectric generator generally has the problems of limited overall heat flux, low waste heat recovery efficiency, low economic benefit and the like due to insufficient temperature difference between cold end and hot end.
Disclosure of Invention
Based on this, it is necessary to provide a waste heat recovery system and offshore operation equipment, which have the advantages of large temperature difference between the cold end and the hot end, large overall heat flux, high waste heat recovery efficiency, high economic benefit and the like, aiming at the problems in the background art.
To solve the above and other problems, in a first aspect, the present invention provides a waste heat recovery system, including:
an exhaust gas pipe for discharging high temperature exhaust gas;
The thermal power generation device comprises a hot end and a cold end; the hot end is attached to the outer wall surface of the waste gas pipeline;
The heat dissipation device is attached to the surface of the cold end of the thermal power generation device; the heat dissipation device is internally provided with a heat dissipation pipeline, and a liquid heat exchange medium is introduced into the heat dissipation pipeline.
In the waste heat recovery system of the embodiment, the heat dissipation device is arranged at the cold end of the thermal power generation device, so that the hot end and the cold end of the thermal power generation device have a larger temperature difference, the whole heat flux of the waste heat recovery system is larger, the waste heat recovery efficiency is higher, and the economic benefit is higher.
In some embodiments, the temperature difference between the hot and cold ends is greater than or equal to 250 ℃.
In some embodiments, the heat dissipating device further comprises: the liquid inlet is communicated with one end of the heat dissipation pipeline, and the liquid outlet is communicated with the other end of the heat dissipation pipeline; the waste heat recovery system further includes:
One end of the liquid inlet pipeline is communicated with the liquid inlet;
the pumping pump is positioned on the liquid inlet pipeline;
One end of the liquid discharge pipeline is communicated with the liquid outlet.
In some embodiments, the heat dissipating device comprises a plate heat exchanger.
In some embodiments, the power generation device includes several thermal generators.
In some embodiments, the liquid heat exchange medium comprises seawater.
In some embodiments, the waste heat recovery system further comprises an electrical storage device connected to the thermal power generation device.
In some embodiments, the hot end is affixed to a portion of the outer wall surface of the exhaust conduit; the waste heat recovery system further comprises a heat preservation material layer, and the heat preservation material layer is attached to the exposed outer wall surface of the waste gas pipeline.
In a second aspect, the present invention also provides an offshore operation device comprising:
A marine operation body;
the waste heat recovery system as described in the first aspect, located on an offshore operation body.
In some embodiments, the offshore operation body comprises a vessel or an offshore platform.
In the waste heat recovery system of the offshore operation equipment in the embodiment, the heat dissipation device is arranged at the cold end of the thermal power generation device, so that the hot end and the cold end of the thermal power generation device have a larger temperature difference, the whole heat flux of the waste heat recovery system is larger, the waste heat recovery efficiency is higher, and the economic benefit is higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other embodiments of the drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 to 3 are schematic structural views of a waste heat recovery system according to an embodiment of the present invention.
Fig. 4 is a schematic perspective view of a heat dissipating device in a waste heat recovery system according to an embodiment of the invention.
Reference numerals illustrate:
10. An exhaust gas duct; 101. an exhaust gas passage; 102. an exhaust gas conduit wall; 11. a thermal power generation device; 12. a heat sink; 121. a liquid inlet; 122. a liquid outlet; 13. a liquid inlet pipeline; 14. a pump; 15. a liquid discharge pipeline; 16. an electric storage device; 17. and a heat preservation material layer.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another component may also be added unless a specifically defined term is used, such as "consisting of only," "… …," etc. Unless mentioned to the contrary, singular terms may include plural and are not to be construed as being one in number.
It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "coupled," and the like are to be construed broadly, and may be, for example, directly connected or indirectly connected through intermediaries, or may be in communication with each other between two elements or in an interaction relationship between the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the illustration, rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
The thermoelectric generator converts circulating heat into electric energy by utilizing a seebeck effect (thermoelectric effect) caused by a temperature difference; the thermoelectric effect of the thermoelectric generator is utilized, waste heat is recovered through the thermoelectric generator in an electric energy form, and the thermoelectric generator has a very long development prospect under the current environmental policy.
The thermoelectric effect of the thermoelectric generator has a great deal of engineering application under specific environmental conditions, particularly in the field of ship/maritime/offshore platform engineering, a great deal of exhaust heat is carried by flue gas generated after combustion of petrochemical fuel and is discharged into the atmosphere, and the waste heat in the exhaust gas generated after combustion of the petrochemical fuel is recovered, so that the thermoelectric generator has great economic benefit and great environmental benefit.
On hybrid passenger vehicles, there have been applications where thermoelectric generators are used to recover thermal energy from the exhaust of a gasoline engine, converting the thermal energy into electrical energy for use in electric mode. However, the thermoelectric generator generally has the problems of limited overall heat flux, low waste heat recovery efficiency, low economic benefit and the like due to insufficient temperature difference between cold end and hot end.
In the field of ship/maritime/offshore platform engineering, the thermoelectric effect of the thermoelectric generator is utilized to recover waste heat in the waste gas, the thermoelectric generator can be cooled in an air cooling mode by taking air as a heat exchange medium under the special environmental working condition of the ship/maritime/offshore platform, but the air cooling heat exchange efficiency is low, so that the obvious common temperature difference between cold-end and hot-end electricity of the thermoelectric generator adopting air cooling is still insufficient, and the problems of limited overall heat flux, low waste heat recovery efficiency, low economic benefit and the like are caused.
In one example, the air heat exchange mode is adopted, and the forced heat exchange coefficient of air is low, so that the following problems exist: the temperature difference between the cold end and the hot end of the thermoelectric generator is small: 53 ℃; the overall heat flux is limited: 25.7kW; disposal problem of heat flowing through thermoelectric generators but not recovered: the heat absorbed by the air causes the room temperature to rise; the waste heat recovery efficiency of the whole thermoelectric generator is low: at a temperature difference of about 50 ℃, almost no thermal energy is recovered and converted into electric energy; has no economic benefit: the investment of the thermoelectric generator is high, and the investment cost is difficult to recover.
As can be seen from the above, under the condition of the ship/maritime/offshore platform, the heat recovery efficiency of the high-temperature exhaust gas by adopting the air cooling and the thermoelectric generator is very low, and the economy is not achieved, which is also the main reason that the thermoelectric generator is slow to develop in the process of recovering waste heat on the ship/maritime/offshore platform.
In one embodiment, referring to fig. 1 to 4, the present invention provides a waste heat recovery system, which may include: an exhaust gas pipe 10, a heat generating device 11, and a heat radiating device 12; wherein the exhaust gas pipe 10 may be used to discharge high temperature exhaust gas; the thermal power plant 11 may include a hot side (not shown) and a cold side (not shown); the hot end is attached to the outer wall surface of the exhaust gas pipeline 10; the heat dissipation device 12 can be attached to the surface of the cold end of the thermal power generation device 11; the heat dissipating device 12 has a heat dissipating pipe (not shown) into which a liquid heat exchanging medium (not shown) is introduced.
In the waste heat recovery system of the above embodiment, by providing the heat dissipating device 12 at the cold end of the thermal power generating device 11, a large temperature difference between the hot end and the cold end of the thermal power generating device 11 can be ensured, so that the overall heat flux of the waste heat recovery system is large, the waste heat recovery efficiency is high, and the economic benefit is high.
As an example, with continued reference to fig. 1, the exhaust conduit 10 may include an exhaust conduit wall 102 and an exhaust passage 101 located inside the exhaust conduit wall 102.
As an example, the exhaust gas pipe 10 may be a cylindrical pipe or a square cylindrical pipe; the cross section of the exhaust passage 101 may be circular or square.
According to the characteristics of the thermoelectric effect, the larger the temperature difference between the hot end and the cold end of the thermoelectric power generation device 11, the higher the thermoelectric conversion rate (the higher the thermoelectric conversion efficiency, the more heat energy is recovered and converted into electric energy); the lower the temperature difference between the hot and cold sides of the thermal power plant 11, the lower its thermoelectric conversion efficiency (the lower the thermoelectric conversion efficiency, the less or almost no thermal energy is recovered and converted to electrical energy).
As an example, the thermal power plant 11 may comprise several thermal power generators, for example, the thermal power plant 11 may comprise a plurality of thermal power generators, and the number of thermal power generators in the thermal power plant 11 may be 1,2,3, 4 or even more.
As an example, the plurality of heat generators may be arranged at intervals in the same plane, or may be arranged adjacently in the same plane.
Specifically, if the temperature difference between the hot side and the cold side of the thermal power generation device 11 is 250 ℃ or more (i.e., the temperature difference between the hot side and the cold side is 250 ℃ or more, for example, the hot side temperature is 300 ℃ and the cold side temperature is 50 ℃), each thermal power generator (the area is 0.003136m 2, for example) in the thermal power generation device 11 can recover the electric power generated at 17W (watts). Whereas, if the temperature difference between the hot side and the cold side of the thermal power generation device 11 is 250 ℃ or less (i.e., the temperature difference between the hot side and the cold side is less than 250 ℃, for example, the hot side temperature is 100 ℃, the cold side temperature is 50 ℃ or more), each thermal power generator (the area is 0.003136m 2, for example) in the thermal power generation device 11 can recover and generate about 1W (almost none) of electric energy.
The maximization of the temperature difference between the hot end and the cold end of the thermal power generation device 11 is realized, and is a key index of an exhaust gas recovery system.
As an example, the hot and cold ends of the thermal power generation device 11 may have a large temperature difference to ensure the power generation efficiency of the thermal power generation device 11; in this embodiment, the temperature difference between the hot end and the cold end may be greater than or equal to 250 ℃; specifically, the temperature difference between the hot and cold ends may be 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃, 500 ℃ or even higher.
As an example, referring to fig. 3 and 4 in conjunction with fig. 1 and 2, the heat dissipating device 12 may further include: the liquid inlet 121 and the liquid outlet 122, the liquid inlet 121 is communicated with one end of the heat dissipation pipeline, and the liquid outlet 122 is communicated with the other end of the heat dissipation pipeline.
As an example, the waste heat recovery system may further include: a liquid inlet pipeline 13, a pumping pump 14 and a liquid discharge pipeline 15; one end of the liquid inlet pipeline 13 is communicated with the liquid inlet 121; the pumping pump 14 is positioned on the liquid inlet pipeline 13; one end of the liquid discharge pipeline 15 is communicated with a liquid outlet 122.
As an example, the heat dissipating device 12 may be any heat exchanger, and in this embodiment, the heat dissipating device 12 may include a plate heat exchanger, as shown in fig. 4.
As an example, the heat dissipation pipe may include a plurality of U-shaped pipes connected in series; of course, in other examples, the heat dissipation conduit may be a straight conduit or an arbitrary meandering conduit.
As an example, the distribution area of the heat dissipation pipes should be no smaller than the bonding area of the cold end of the thermal power generation device 11 and the heat dissipation device 12 to ensure the heat dissipation effect; the cold end of the instant heating power generation device 11 is attached to the distribution area of the heat dissipation pipeline in the heat dissipation device 12.
As an example, the housing of the heat dissipating device 12 may be any housing having high thermal conductivity, and in this embodiment, the housing of the heat dissipating device 12 may be a metal housing, such as an iron housing, an aluminum housing, a copper housing, or a stainless steel housing.
As an example, the waste heat recovery system may be used in a ship, maritime, or offshore platform.
As an example, the liquid heat exchange medium may comprise a liquid medium, which in this embodiment may comprise seawater.
In this embodiment, seawater is used as a liquid heat exchange medium, so that the water cooling heat exchange efficiency is high, and the following technical effects can be achieved: realizing and maintaining a large temperature difference between the hot end and the cold end of the thermal power generation device 11; the overall heat flux is improved; heat that flows through the thermal power generation device 11 but is not recovered is absorbed and treated by sea water; the waste heat recovery rate of the whole heat power generation device 11 is greatly improved; has great economic benefit.
It should be noted that when the seawater is discharged as the liquid heat exchange medium after passing through the heat dissipating device 12, the temperature will rise due to heat absorption, and in order to avoid adverse effects on the marine environment caused by the too high temperature of the seawater discharged from the heat dissipating device 12, the temperature of the seawater discharged from the heat dissipating device 12 needs to be controlled within a reasonable range, for example, the temperature of the seawater discharged from the heat dissipating device 12 needs to be controlled to be less than 45 ℃; specifically, the temperature of the seawater discharged from the heat sink 12 may be controlled at 40 ℃, 35 ℃, 30 ℃,25 ℃,20 ℃,15 ℃,10 ℃, or the like.
Specifically, the waste heat recovery system may further include a temperature detecting device (not shown) and a control device (not shown); the temperature detecting device may be located at the liquid outlet 122, and is configured to detect a temperature of the liquid heat exchange medium discharged from the liquid outlet 122, and feed back a detection result to the control device; the control device may be connected to both the pump 14 and the temperature detecting device, and the control device may be configured to control the pumping power of the pump 14 based on the temperature of the discharged liquid heat exchange medium fed back by the temperature detecting device. For example, when the temperature detecting device detects that the temperature of the liquid heat exchange medium discharged from the liquid outlet 122 is greater than or equal to 45 ℃, the control device controls the pump 14 to increase the pumping power, so as to increase the flow speed of the liquid heat exchange medium in the liquid inlet pipeline 13, the heat dissipation pipeline and the liquid discharge pipeline 13, thereby improving the heat exchange effect and reducing the temperature of the liquid heat exchange medium discharged from the liquid outlet 122.
Specifically, the waste heat recovery system in one example adopts a water circulation forced convection heat exchange mode, so that the heat exchange coefficient is greatly improved, the problems existing before are solved, and the following technical effects are achieved: the temperature difference between the hot end and the cold end of the thermal power generation device 11 is increased and can reach 265 ℃; the overall heat flux is improved and can reach 128.8kW; heat treatment problem of heat flowing through the thermal power generation device 11 but not recovered: is absorbed and treated by seawater; the waste heat recovery efficiency of the whole heat power generation device 11 is greatly improved: at a temperature difference of about 250 ℃, a limit value for the efficiency of the thermal power plant 11 is reached; has larger economic benefit: the full investment can be recovered in about 5 years.
As an example, referring to fig. 1 to 3, the waste heat recovery system may further include an electric storage device 16, and the electric storage device 16 is connected to the thermal power generation device 11. Specifically, power storage device 16 may include a rechargeable power storage device, such as a battery or the like.
As an example, when the thermal power generation device 11 includes a plurality of thermal power generators, the power storage device 16 is connected to each of the thermal power generators to store electric power generated by each of the thermal power generators.
As an example, with continued reference to fig. 1, the hot end may be affixed to a portion of the outer wall surface of the exhaust duct 10; the waste heat recovery system may further comprise a layer of insulation 17, the layer of insulation 17 being applied to the exposed outer wall surface (i.e. the outer wall surface not covered by the hot end) of the exhaust gas conduit 10. It should be noted that the hot end may also cover all the outer wall surfaces of the exhaust gas pipe 10, and the waste heat recovery system may not be provided with the insulating material layer 17.
By way of example, the insulating material layer 17 may include, but is not limited to, an insulating foam layer or an insulating coating, and the like.
Specifically, the working process of the waste heat recovery system of the invention comprises the following parts: high temperature heat source: the high temperature exhaust gas continuously flows through the exhaust gas pipe 10, and the inner wall of the exhaust gas pipe 10 is heated to a high temperature t1 (which may be, but is not limited to, about 350 ℃); heat conduction between the inner and outer walls of the pipe: heat is conducted from the high-temperature inner wall of the exhaust gas pipe 10 to the low-temperature outer wall, so that the temperature of the outer wall of the exhaust gas pipe 10 reaches t2; the outer wall of the exhaust gas pipeline 10 is closely attached to the hot end of the thermal power generation device 11, and the temperature of the thermal power generation device 11 is equal to the temperature of the outer wall of the exhaust gas pipeline 10 (i.e. the temperature of the hot end of the thermal power generation device 11 is also t 2); thermal conduction between the hot and cold ends of the thermal power plant 11: the heat is continuously conducted from the hot end of the high-temperature thermal power generation device 11 to the cold end of the thermal power generation device 11, and the temperature of the cold end of the thermal power generation device 11 can be t3; the cold end of the heat generating device 11 is tightly attached to the hot surface of the heat dissipating device 12, and the hot surface temperature of the heat dissipating device 12 is equal to the cold end temperature of the heat generating device 11 (i.e. the hot surface temperature of the heat dissipating device 12 is also t 3); thermal conduction of the hot surface of the heat sink 12 with the cold surface of the heat sink 12: heat continues to be conducted from the hot surface at high temperature (temperature t 3) to the cold surface of the heat sink 12, which may be at temperature t4; forced convection heat exchange between the cold surface of the heat sink 12 and the circulating liquid heat exchange medium: the heat continues to be conducted from the cold surface (temperature t 4) of the high temperature heat sink 12 to the liquid heat exchange medium (temperature may be t 5), which absorbs the heat and increases in temperature, eventually discharging the absorbed heat outboard.
Specifically, the heat conduction mode and steps involved in the waste heat recovery flow of the waste heat recovery system of the invention are as follows: conduction heat exchange between the pipe walls (between the pipe outer wall and the pipe inner wall) of the exhaust gas pipe 10 has a heat exchange coefficient of h1, a corresponding thermal resistance coefficient of r1=1/(h1×a), and a corresponding circulation heat quantity of q1= (t 1-t 2)/r 1; the heat exchange coefficient of conduction heat exchange between the hot end and the cold end of the thermal power generation device 11 is h2, the corresponding thermal resistance coefficient is r2=1/(h2×a), and the corresponding circulating heat is q2= (t 2-t 3)/r 2; the heat exchange coefficient of conduction between the hot surface and the cold surface of the heat dissipating device 12 is h3, the corresponding thermal resistance coefficient is r3=1/(h3×a), and the corresponding circulating heat is q3= (t 3-t 4)/r 3; the heat exchange coefficient is h4, the corresponding thermal resistance coefficient is r4=1/(h4×a), and the corresponding circulation heat is q4= (t 4-t 5)/r 4. It should be noted that a in each of the above corresponding thermal resistivity formulas is a thermal conduction cross-sectional area. After the waste heat recovery process, the circulation heat correspondingly recovered is as follows: q= (t 1-t 5)/(r1+r2+r3+r4).
From the above, the flow heat is proportional to the temperature difference and inversely proportional to the thermal resistance; the thermal resistivity is inversely proportional to the heat transfer coefficient; the temperature difference is proportional to the thermal resistivity and inversely proportional to the heat transfer coefficient. The possible measures for maximizing the temperature difference between the cold and hot ends of the thermal power plant 11 can be made by the following: the heat exchange coefficient h4 of forced convection heat exchange between the cold surface of the heat radiating device 12 and the liquid heat exchange medium is improved; reducing the thermal coefficient of resistance r4 of forced convection heat exchange between the cold surface of the heat sink 12 and the liquid heat exchange medium; reducing the thermal coefficient r of the waste heat recovery system (r=r1+r2+r3+r4), wherein the circulation heat Q increases even if the overall temperature difference is unchanged (t 1-t5 is still present); the heat flow Q maintains the thermal coefficient r2 of conduction heat exchange between the hot side and the cold side of the thermal power generation device 11 unchanged, and the temperature difference (t 2-t 3) between the cold side and the hot side of the thermal power generation device 11 increases.
The waste heat recovery system adopts water circulation as a liquid heat exchange medium, so that the forced convection heat exchange coefficient is greatly improved, the heat flux is further increased, the large temperature difference between the cold end and the hot end of the thermoelectric generator is realized and maintained, the thermoelectric generator works under the working condition of optimal efficiency, and a large amount of waste heat is recovered and converted into electric energy.
In another embodiment, referring still to fig. 1-4, the present invention also provides an offshore operation device, which may comprise: a main body of offshore work (not shown) and a waste heat recovery system as shown in fig. 1 to 4; the waste heat recovery system may be located on an offshore work body.
As an example, the offshore operation body may be any operation platform which operates offshore and can generate waste heat; in particular, in this embodiment, the offshore operation body may include, but is not limited to, a ship or an offshore platform.
In the waste heat recovery system of the offshore operation equipment in the above embodiment, by arranging the heat dissipating device 12 at the cold end of the thermal power generation device 11, a large temperature difference between the hot end and the cold end of the thermal power generation device 11 can be ensured, so that the overall heat flux of the waste heat recovery system is large, the waste heat recovery efficiency is high, and the economic benefit is high.
Note that the above embodiments are for illustrative purposes only and are not meant to limit the present disclosure.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A waste heat recovery system, comprising:
an exhaust gas pipe for discharging high temperature exhaust gas;
The thermal power generation device comprises a hot end and a cold end; the hot end is attached to the outer wall surface of the waste gas pipeline;
the heat dissipation device is attached to the surface of the cold end of the thermal power generation device; the heat dissipation device is internally provided with a heat dissipation pipeline, and a liquid heat exchange medium is introduced into the heat dissipation pipeline.
2. The waste heat recovery system of claim 1, wherein a temperature difference between the hot end and the cold end is greater than or equal to 250 ℃.
3. The waste heat recovery system of claim 1, wherein the heat sink further comprises: the liquid inlet is communicated with one end of the heat dissipation pipeline, and the liquid outlet is communicated with the other end of the heat dissipation pipeline; the waste heat recovery system further includes:
One end of the liquid inlet pipeline is communicated with the liquid inlet;
the pumping pump is positioned on the liquid inlet pipeline;
one end of the liquid discharge pipeline is communicated with the liquid outlet.
4. The waste heat recovery system of claim 1, wherein the heat sink comprises a plate heat exchanger.
5. The waste heat recovery system of claim 1, wherein the thermal power generation device comprises a number of thermal generators.
6. The waste heat recovery system of claim 1, wherein the liquid heat exchange medium comprises seawater.
7. The waste heat recovery system of claim 1, further comprising an electrical storage device connected to the thermal power generation device.
8. The waste heat recovery system of claim 1, wherein the hot end is affixed to a portion of an outer wall surface of the exhaust conduit; the waste heat recovery system further comprises a heat preservation material layer, and the heat preservation material layer is attached to the exposed outer wall surface of the waste gas pipeline.
9. An offshore operation facility, comprising:
A marine operation body;
The waste heat recovery system of any one of claims 1 to 8, located on the offshore operation body.
10. The offshore operation device of claim 9, wherein the offshore operation body comprises a vessel or an offshore platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410370717.9A CN118030231A (en) | 2024-03-29 | 2024-03-29 | Waste heat recovery system and offshore operation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410370717.9A CN118030231A (en) | 2024-03-29 | 2024-03-29 | Waste heat recovery system and offshore operation equipment |
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| Publication Number | Publication Date |
|---|---|
| CN118030231A true CN118030231A (en) | 2024-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410370717.9A Pending CN118030231A (en) | 2024-03-29 | 2024-03-29 | Waste heat recovery system and offshore operation equipment |
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| Country | Link |
|---|---|
| CN (1) | CN118030231A (en) |
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2024
- 2024-03-29 CN CN202410370717.9A patent/CN118030231A/en active Pending
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