CN114838526B - Double-working-medium shell-and-tube evaporator applied to organic Rankine cycle - Google Patents
Double-working-medium shell-and-tube evaporator applied to organic Rankine cycle Download PDFInfo
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- CN114838526B CN114838526B CN202210580523.2A CN202210580523A CN114838526B CN 114838526 B CN114838526 B CN 114838526B CN 202210580523 A CN202210580523 A CN 202210580523A CN 114838526 B CN114838526 B CN 114838526B
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- working medium
- tube bundle
- preheating
- heat source
- tube
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- 238000001704 evaporation Methods 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 230000008020 evaporation Effects 0.000 claims abstract description 47
- 238000005192 partition Methods 0.000 claims description 16
- 230000008676 import Effects 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 12
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 description 4
- 210000002445 nipple Anatomy 0.000 description 3
- LVGUZGTVOIAKKC-UHFFFAOYSA-N 1,1,1,2-tetrafluoroethane Chemical compound FCC(F)(F)F LVGUZGTVOIAKKC-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/02—Header boxes; End plates
- F28F9/04—Arrangements for sealing elements into header boxes or end plates
- F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a double-working-medium shell-and-tube evaporator applied to an organic Rankine cycle. The shell-and-tube evaporator comprises an evaporation heating section of two working media and a preheating section of the two working media; the heat transfer narrow point position in the heat exchange process can be adjusted through sectional evaporation heating of working media, so that the heat transfer matching property in the heat exchange process is improved, the heat exchange quantity of the evaporator is improved, and the cycle performance of the organic Rankine cycle is improved. The other two working media are independently operated, the evaporating temperature and the flow can be independently adjusted and optimized, and the operation and the adjustment of the evaporator are facilitated.
Description
Technical Field
The present invention relates to evaporators, and more particularly to dual-working-medium shell-and-tube evaporators.
Background
The application of the medium-low temperature waste heat recycling technology based on the organic Rankine cycle is wider and wider. In order to improve the thermodynamic performance of the organic Rankine cycle, the continuous enrichment of the cycle pattern and the optimization of the heat exchange process become an important research direction. Therefore, the structural form of the heat exchanger is constantly changing in order to improve the heat transfer matching in the heat exchange process.
In the existing evaporator, because the heat transfer narrow point exists in the heat exchange process and is generally positioned at the bubble point of the working medium, the heat exchange quantity of the evaporator is limited, and the heat source utilization rate is not high, so that the cycle performance of the organic Rankine cycle is also limited. The heat transfer narrow point position in the heat exchange process can be adjusted by adopting a plurality of working media with different critical temperatures for sectional evaporation heating, so that the heat exchange quantity of the evaporator is improved, the utilization rate of a heat source is improved, the cycle performance of the organic Rankine cycle is improved, and the heat exchange process and the structure of the heat exchanger are required to be newly designed. At present, for the occasion of multi-working-medium common heat exchange, a mode of parallel connection or serial connection of a plurality of heat exchangers is generally adopted, so that the manufacturing cost and the complexity of the heat exchangers are improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-working-medium shell-and-tube evaporator which can improve the utilization rate of a heat source and the performance of an organic Rankine cycle and is applied to the organic Rankine cycle.
The invention discloses a double-working-medium shell-and-tube evaporator applied to an organic Rankine cycle, which comprises a shell, wherein a working medium inlet side seal head is fixed at the right end of the shell, a heat source inlet side seal head is fixed at the left end of the shell, a heat source tube bundle fixing tube plate, a first longitudinal baffle plate, a second longitudinal baffle plate and a working medium tube bundle fixing tube plate are sequentially fixed in the shell from left to right at intervals, and the interior of the shell is divided into three independent areas, wherein the area between the heat source tube bundle fixing tube plate and the first longitudinal baffle plate is a first evaporation heating area, the area between the first longitudinal baffle plate and the second longitudinal baffle plate is a second evaporation heating area, the area between the second longitudinal baffle plate and the working medium tube bundle fixing tube plate is a preheating area, and a cavity between the working medium tube bundle fixing tube plate and the working medium inlet side seal head is divided into an upper independent cavity and a lower independent cavity through transverse baffle plates arranged along the horizontal direction; the outlet of the first working medium inlet connecting pipe is communicated with an opening on a working medium inlet side seal head positioned at the lower cavity, the outlet of the second working medium inlet connecting pipe is communicated with an opening on a working medium inlet side seal head positioned at the upper cavity, the outlet of the heat source inlet connecting pipe is communicated with an opening on a heat source inlet side seal head, the inlet of the first working medium outlet connecting pipe is communicated with an opening on a shell at the first evaporation heating zone, the inlet of the second working medium outlet connecting pipe is communicated with an opening on a shell at the second evaporation heating zone, and the inlet of the heat source outlet connecting pipe is communicated with an opening on a shell at the preheating zone;
a first working medium preheating tube bundle is arranged in the preheating zone corresponding to the lower cavity and the second evaporation heating zone along the horizontal direction, the right end of the first working medium preheating tube bundle is fixed on a working medium tube bundle fixing tube plate, and the left end of the first working medium preheating tube bundle passes through a second longitudinal baffle plate and is fixed on the first longitudinal baffle plate;
a second working medium preheating tube bundle is arranged in the preheating zone corresponding to the upper cavity along the horizontal direction, and the left end and the right end of the second working medium preheating tube bundle are respectively fixed on a second longitudinal baffle plate and a working medium tube bundle fixing tube plate;
one end of the heat source fin tube bundle arranged along the horizontal direction is fixed on the heat source tube bundle fixing tube plate, and the other end of the heat source fin tube bundle penetrates through the first longitudinal partition plate and is fixedly connected with the second longitudinal partition plate;
the first working medium preheating tube bundle is used for receiving a first working medium from a first working medium inlet connecting tube, sending the first working medium into a preheating zone and a second evaporation heating zone for preheating, and then entering a shell side of the first evaporation heating zone for evaporation heating;
the second working medium preheating tube bundle is used for receiving a second working medium from a second working medium inlet connecting tube, sending the second working medium into a preheating zone for preheating, and then entering a shell side of a second evaporation heating zone for evaporation heating;
the heat source finned tube bundle is used for receiving a heat source from a heat source inlet connecting tube, sending the heat source into a first evaporation heating zone to evaporate and heat a first working medium, then evaporating and heating a second working medium in a second evaporation heating zone, indirectly heating the first working medium, and then entering a shell side in a preheating zone to preheat the first working medium and the second working medium.
The invention can realize the evaporation heating process and effect of double working media. The double working mediums independently operate, the evaporation temperature and the flow of each working medium in the heat exchange process can be independently adjusted and optimized, and the adjustment of the position of a heat transfer narrow point in the heat exchange process is realized, so that the heat transfer matching performance in the heat exchange process is improved, the heat exchange capacity of an evaporator is improved, the utilization rate of a heat source is improved, and the cycle performance of the organic Rankine cycle is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.
FIG. 1 is a schematic view of a dual shell and tube evaporator according to the present invention;
FIG. 2 is a schematic diagram of the working medium inlet side seal head structure of the shell-and-tube evaporator of the invention;
fig. 3 is an organic rankine cycle temperature entropy diagram of a double shell-and-tube evaporator employing the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
As shown in fig. 1-2, the double-working-medium shell-and-tube evaporator applied to the organic rankine cycle comprises a shell 1, a working-medium inlet side end socket 5 is fixed at the right end of the shell 1, a heat source inlet side end socket 6 is fixed at the left end of the shell 1, a heat source tube bundle fixing tube plate 7, a first longitudinal baffle plate 2, a second longitudinal baffle plate 3 and a working-medium tube bundle fixing tube plate 8 are sequentially fixed in the shell from left to right at intervals and divide the interior of the shell into three independent areas, wherein the area between the heat source tube bundle fixing tube plate 7 and the first longitudinal baffle plate 2 is a first evaporation heating area 12, the area between the first longitudinal baffle plate 2 and the second longitudinal baffle plate 3 is a second evaporation heating area 13, the area between the second longitudinal baffle plate 3 and the working-medium tube bundle fixing tube plate 8 is a preheating area 14, and the cavity between the working-medium tube bundle fixing tube plate 8 and the working-medium inlet side end socket 5 is divided into two independent cavities by a transverse baffle plate 4 arranged along the horizontal direction. The outlet of the first working medium inlet connecting pipe 15 is communicated with an opening on the working medium inlet side end socket 5 positioned at the lower cavity, the outlet of the second working medium inlet connecting pipe 17 is communicated with an opening on the working medium inlet side end socket 5 positioned at the upper cavity, and the outlet of the heat source inlet connecting pipe 19 is communicated with an opening on the heat source inlet side end socket 6. The inlet of the first working substance outlet nipple 16 communicates with an opening in the housing at the first evaporation heating zone 12, and the inlet of the second working substance outlet nipple 18 communicates with an opening in the housing at the second evaporation heating zone 13. The inlet of the heat source outlet nipple 20 communicates with an opening in the housing at the preheating zone 14.
A first working medium preheating tube bundle 9 is arranged in a preheating zone 14 corresponding to the lower cavity and a second evaporating heating zone 13 along the horizontal direction, the right end of the first working medium preheating tube bundle 9 is fixed on a working medium tube bundle fixing tube plate 8, and the left end of the first working medium preheating tube bundle 9 passes through the second longitudinal partition plate 3 and is fixed on the first longitudinal partition plate 2.
A second working medium preheating tube bundle 10 is arranged in the preheating zone 14 corresponding to the upper cavity along the horizontal direction, and the left end and the right end of the second working medium preheating tube bundle 10 are respectively fixed on the second longitudinal partition plate 3 and the working medium tube bundle fixing tube plate 8.
One end of the heat source fin tube bundle 11 disposed in the horizontal direction is fixed to the heat source tube bundle fixing tube sheet 7 and the other end is fixedly connected to the second longitudinal partition 3 through the first longitudinal partition 2.
The first working medium preheating tube bundle 9 is used for receiving a first working medium from the first working medium inlet connecting tube 15, sending the first working medium into the preheating zone 14 and the second evaporation heating zone 13 for preheating, and then sending the first working medium into the shell side of the first evaporation heating zone 12 for evaporation heating;
the second working medium preheating tube bundle 10 is used for receiving a second working medium from the second working medium inlet connecting tube 17, sending the second working medium into the preheating zone 14 for preheating, and then entering the shell side of the second evaporation heating zone 13 for evaporation heating;
the heat source finned tube bundle 11 is used for receiving a heat source from a heat source inlet connecting tube 19, sending the heat source into the first evaporation heating zone 12 to evaporate and heat a first working medium, then evaporating and heating a second working medium in the second evaporation heating zone 13, indirectly heating the first working medium, and then entering a shell side in the preheating zone 14 to preheat the first working medium and the second working medium simultaneously.
The working process of the device is as follows:
the first working medium enters the first working medium preheating tube bundle 9 from the first working medium inlet connecting tube 15, is preheated by the preheating zone 14 and the second evaporation heating zone 13, then enters the shell side evaporation heating of the first evaporation heating zone 12, and steam is discharged from the first working medium outlet connecting tube 16.
The second working medium enters the second working medium preheating tube bundle 10 from the second working medium inlet connecting tube 17, is preheated by the preheating zone 14, then enters the shell side evaporation heating of the second evaporation heating zone 13, and steam is discharged from the second working medium outlet connecting tube 18.
The heat source enters the heat source finned tube bundle 11 from the heat source inlet connecting tube 19, the first working medium is evaporated and heated in the first evaporation heating zone 12, the second working medium is evaporated and heated in the second evaporation heating zone 13, the first working medium is indirectly heated, the first working medium and the second working medium are preheated simultaneously in the preheating zone 14 and enter the shell side, and finally the first working medium and the second working medium are discharged through the heat source outlet connecting tube 20.
In the implementation application, the preheating and evaporating heating processes of the two working mediums are mutually independent, and the respective evaporating temperature and flow of the two working mediums can be independently adjusted and optimized so as to improve the heat exchange capacity of the evaporator.
Table 1 shows the cycle performance of a stacked organic rankine cycle using a dual-working-medium shell-and-tube evaporator according to the present invention compared to an organic rankine cycle using a mixed working medium.
Scheme one: organic Rankine cycle adopting mixed working medium R245fa/R134a (pentafluoropropane/tetrafluoroethane) =0.1:0.9;
scheme II: stacked organic Rankine cycle employing shell-and-tube evaporator of double-working-medium R245fa-R134a (pentafluoropropane/tetrafluoroethane);
the calculation conditions are as follows: the heat source is represented by 110 ℃ hot water, and the mass flow is 1kg/s; the inlet temperature of cooling water is 25 ℃, and the outlet temperature is 30 ℃; the efficiency of the expander is 0.85, and the isentropic efficiency of the working medium pump is 0.8. The above parameters are the same for both schemes.
Table 1 comparison of two organic Rankine cycles with working medium R245fa/R134a
The results show that: compared with the conventional organic Rankine cycle (scheme one), the net output power of the stacked organic Rankine cycle (scheme two) is increased by 4.41kW, the lifting rate reaches 29.30%, and the cycle thermal efficiency are improvedThe efficiency is improved by 5.71% and 29.24% respectively. FIG. 3 shows that the double-working-medium shell-and-tube evaporator for the organic Rankine cycle can effectively adjust the position of a narrow heat transfer point, and greatly reduce the outlet temperature of a heat sourceThe heat source heat is utilized more efficiently, the average heat exchange temperature difference in the process of evaporating and heat exchanging by the working medium is close to the narrow-point temperature difference, and the heat transfer matching performance of circulation is better.
The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.
Claims (1)
1. Be applied to organic rankine cycle's duplex matter shell and tube evaporator, including casing (1) the right-hand member of casing be fixed with working medium import side head (5) the left end of casing be fixed with heat source import side head (6), its characterized in that: a heat source tube bundle fixing tube plate (7), a first longitudinal partition plate (2), a second longitudinal partition plate (3) and a working medium tube bundle fixing tube plate (8) are sequentially fixed in the shell at intervals from left to right, and the interior of the shell is divided into three independent areas, wherein the area between the heat source tube bundle fixing tube plate and the first longitudinal partition plate is a first evaporation heating area (12), the area between the first longitudinal partition plate and the second longitudinal partition plate is a second evaporation heating area (13), the area between the second longitudinal partition plate and the working medium tube bundle fixing tube plate is a preheating area (14), and a cavity between the working medium tube bundle fixing tube plate and a working medium inlet side seal head is divided into an upper cavity and a lower cavity which are independent from each other through a transverse partition plate (4) arranged along the horizontal direction; the outlet of the first working medium inlet connecting pipe (15) is communicated with an opening on a working medium inlet side seal head positioned at the lower cavity, the outlet of the second working medium inlet connecting pipe (17) is communicated with an opening on a working medium inlet side seal head positioned at the upper cavity, the outlet of the heat source inlet connecting pipe (19) is communicated with an opening on a heat source inlet side seal head (6), the inlet of the first working medium outlet connecting pipe (16) is communicated with an opening on a shell at the first evaporation heating zone, the inlet of the second working medium outlet connecting pipe (18) is communicated with an opening on a shell at the second evaporation heating zone, and the inlet of the heat source outlet connecting pipe (20) is communicated with an opening on a shell at the preheating zone;
a first working medium preheating tube bundle is arranged in the preheating zone corresponding to the lower cavity and the second evaporation heating zone along the horizontal direction, the right end of the first working medium preheating tube bundle is fixed on a working medium tube bundle fixing tube plate, and the left end of the first working medium preheating tube bundle passes through a second longitudinal baffle plate and is fixed on the first longitudinal baffle plate;
a second working medium preheating tube bundle is arranged in the preheating zone corresponding to the upper cavity along the horizontal direction, and the left end and the right end of the second working medium preheating tube bundle are respectively fixed on a second longitudinal baffle plate and a working medium tube bundle fixing tube plate;
one end of the heat source fin tube bundle arranged along the horizontal direction is fixed on the heat source tube bundle fixing tube plate, and the other end of the heat source fin tube bundle penetrates through the first longitudinal partition plate and is fixedly connected with the second longitudinal partition plate;
the first working medium preheating tube bundle is used for receiving a first working medium from a first working medium inlet connecting tube, sending the first working medium into a preheating zone and a second evaporation heating zone for preheating, and then entering a shell side of the first evaporation heating zone for evaporation heating;
the second working medium preheating tube bundle is used for receiving a second working medium from a second working medium inlet connecting tube, sending the second working medium into a preheating zone for preheating, and then entering a shell side of a second evaporation heating zone for evaporation heating;
the heat source finned tube bundle is used for receiving a heat source from a heat source inlet connecting tube, sending the heat source into a first evaporation heating zone to evaporate and heat a first working medium, then evaporating and heating a second working medium in a second evaporation heating zone, indirectly heating the first working medium, and then entering a shell side in a preheating zone to preheat the first working medium and the second working medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210580523.2A CN114838526B (en) | 2022-05-26 | 2022-05-26 | Double-working-medium shell-and-tube evaporator applied to organic Rankine cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210580523.2A CN114838526B (en) | 2022-05-26 | 2022-05-26 | Double-working-medium shell-and-tube evaporator applied to organic Rankine cycle |
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| Publication Number | Publication Date |
|---|---|
| CN114838526A CN114838526A (en) | 2022-08-02 |
| CN114838526B true CN114838526B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210580523.2A Active CN114838526B (en) | 2022-05-26 | 2022-05-26 | Double-working-medium shell-and-tube evaporator applied to organic Rankine cycle |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD269429A1 (en) * | 1988-02-04 | 1989-06-28 | Schwermasch Liebknecht Veb K | COMBINED EVAPORATOR OVERHEATER |
| WO2013074749A1 (en) * | 2011-11-18 | 2013-05-23 | Carrier Corporation | Shell and tube heat exchanger |
| CN105135755A (en) * | 2015-08-17 | 2015-12-09 | 南京冷德节能科技有限公司 | Spraying type evaporator |
| CN107328144A (en) * | 2017-08-21 | 2017-11-07 | 广东工业大学 | Mass dryness fraction control method and evaporator in a kind of pipe of evaporator |
| CN214891081U (en) * | 2021-03-29 | 2021-11-26 | 杭州日能科技有限公司 | Shell-and-tube heat exchanger and system for generating set noncondensable gas exhaust collection thereof |
-
2022
- 2022-05-26 CN CN202210580523.2A patent/CN114838526B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD269429A1 (en) * | 1988-02-04 | 1989-06-28 | Schwermasch Liebknecht Veb K | COMBINED EVAPORATOR OVERHEATER |
| WO2013074749A1 (en) * | 2011-11-18 | 2013-05-23 | Carrier Corporation | Shell and tube heat exchanger |
| CN105135755A (en) * | 2015-08-17 | 2015-12-09 | 南京冷德节能科技有限公司 | Spraying type evaporator |
| CN107328144A (en) * | 2017-08-21 | 2017-11-07 | 广东工业大学 | Mass dryness fraction control method and evaporator in a kind of pipe of evaporator |
| CN214891081U (en) * | 2021-03-29 | 2021-11-26 | 杭州日能科技有限公司 | Shell-and-tube heat exchanger and system for generating set noncondensable gas exhaust collection thereof |
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| Publication number | Publication date |
|---|---|
| CN114838526A (en) | 2022-08-02 |
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