CN209875237U - Supercritical double-expansion two-stage regenerative organic Rankine cycle system - Google Patents
Supercritical double-expansion two-stage regenerative organic Rankine cycle system Download PDFInfo
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- CN209875237U CN209875237U CN201920078372.4U CN201920078372U CN209875237U CN 209875237 U CN209875237 U CN 209875237U CN 201920078372 U CN201920078372 U CN 201920078372U CN 209875237 U CN209875237 U CN 209875237U
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- 230000001172 regenerating effect Effects 0.000 title claims description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims description 4
- 230000008929 regeneration Effects 0.000 claims description 2
- 238000011069 regeneration method Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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Abstract
The utility model discloses an organic Rankine cycle system of two-stage backheat of supercritical pair of expansion, including first order evaporation cycle system, second level evaporation cycle system and hybrid system, first order evaporation cycle system pressurizes to the supercritical state through working medium pump A with the cycle working medium, inputs expander A after heating to the supercritical state with the cycle working medium through evaporimeter A again, obtains the electric energy; second oneThe stage evaporation circulating system inputs the circulating working medium into a working medium pump B, a heat regenerator and an evaporator B in sequence and then inputs the circulating working medium into an expander B to obtain electric energy; expander A and expander B output connection hybrid system, hybrid system send the next duty cycle of people again after cooling down cycle medium, the utility model discloses heat transfer in-processThe loss is less, the heat exchange effect is better, and the waste heat utilization rate is improved.
Description
Technical Field
The utility model belongs to the technical field of retrieve the organic rankine cycle system of low-grade heat, especially, relate to an organic rankine cycle system of two-stage heat return of supercritical double expansion.
Background
At present, the energy demand is increasing day by day, and the environmental pollution is becoming serious day by day, so that the urgent need is to change the energy structure, save and utilize the traditional energy and optimize the energy utilization mode; meanwhile, the medium and low grade energy sources are particularly rich, such as medium and low temperature waste heat energy, solar energy, geothermal energy and the like. As a theoretically mature medium-low temperature waste heat recovery technology, the organic Rankine cycle has the advantages of simple structure, high efficiency, environmental friendliness and the like. Therefore, the organic Rankine cycle is used for efficiently recovering the medium-low grade waste heat, and the method has important significance for improving the energy utilization rate of China and improving the environmental problem.
However, at present, the thermal efficiency and the power generation rate of the organic rankine cycle are relatively low, and the development of the system reaches a bottleneck period, which prompts improvement of the structural design of the system. Utility model has been realized among the prior art that cascade organic rankine cycle system to and the distributed energy power generation system of waste heat multi-stage utilization, though these systems improve efficiency when having realized the cascade utilization of energy, but in fact their thermal efficiency and generating efficiency are still not high, and energy loss is still great.
SUMMERY OF THE UTILITY MODEL
The utility model discloses according to the problem that exists among the prior art, provide an organic rankine cycle system of two-stage backheat of two inflation of supercritical fluid, aim at provides one kind in the heat transfer processThe organic Rankine cycle system has the advantages of smaller loss, better heat exchange effect and improved waste heat utilization rate.
The utility model discloses the technical scheme who adopts as follows:
a supercritical double-expansion two-stage regenerative organic Rankine cycle system comprises a first-stage evaporation cycle system, a second-stage evaporation cycle system and a mixing system, wherein the first-stage evaporation cycle system pressurizes a circulating working medium to a supercritical state through a working medium pump A, heats the circulating working medium to a critical state through an evaporator A and inputs the heated circulating working medium to an expander A to obtain electric energy; the second-stage evaporation circulating system inputs the circulating working medium into the heat regenerator and the evaporator B in sequence and then inputs the circulating working medium into the expander B to obtain electric energy; and the output ends of the expansion machine A and the expansion machine B are connected with a mixing system, and the mixing system cools the circulating working medium and then sends the cooled circulating working medium to the next working cycle. The circulating working medium can adopt pure working media R115, R125, R143a or R218, or mixed working media R404a or R507 a.
Further, the first-stage evaporation cycle comprises a working medium pump A, the outlet of the working medium pump A is connected with the steam inlet of the evaporator A, the steam outlet of the evaporator A is connected with an expander A, the expander A is connected with the generator A, the outlet of the expander A is connected with the exhaust steam inlet of the evaporator B, and the exhaust steam outlet of the evaporator B is connected with the inlet of a steam mixer;
further, the second-stage evaporation circulation system comprises a working medium pump B, the outlet of the working medium pump B is connected with the steam inlet of a heat regenerator, the steam outlet of the heat regenerator is connected with the steam inlet of an evaporator B, the steam outlet of the evaporator B is connected with an expander B, the expander B is connected with a generator B, and the outlet of the expander B is connected with the inlet of a steam mixer;
further, the mixing system comprises a steam mixer, an outlet of the steam mixer is connected with a waste steam inlet of the heat regenerator, a waste steam outlet of the heat regenerator is connected with a waste steam inlet of the condenser, and a waste steam outlet of the condenser is respectively connected with the working medium pump A and the working medium pump B;
further, the working medium pump a pressurizes the circulating working medium to a state exceeding the critical state.
Further, the evaporator A heats the circulating working medium to a critical state.
The utility model has the advantages that:
the system is as followsThe first-stage evaporation adopts a supercritical state to recover waste heat resources, the exhaust steam at the outlet of the expansion machine is used for the second-stage evaporation of the waste heat, the temperature difference area in the heat exchange process is better matched,the loss is less, the heat exchange effect is better, and the device is matched with the repeated waste heat recovery, and can be suitable for waste heat with lower temperature and wider organic working media. The system has low environmental pollution degree, and is more energy-saving and environment-friendly.
Drawings
FIG. 1 is a supercritical dual-expansion two-stage regenerative organic Rankine cycle system;
in the figure, 1, an evaporator A, 2, an expander A, 3, a generator A, 4, an expander B, 5, a generator B, 6, a steam mixer, 7, an evaporator B, 8, a heat regenerator, 9, a condenser, 10, a working medium pump B, 11 and a working medium pump A.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the organic rankine cycle system for supercritical double-expansion two-stage heat regeneration provided by the present invention includes a first-stage evaporation cycle system, a second-stage evaporation cycle system and a hybrid system; an outlet of a working medium pump A11 in the first-stage evaporation circulation system is connected with a steam inlet of an evaporator A1, a steam outlet of an evaporator A1 is connected with an expander A2, the expander A2 is connected with a generator A3, an outlet of the expander A2 is connected with a steam exhaust inlet of an evaporator B7, and a steam exhaust outlet of the evaporator B7 is connected with an inlet of a steam mixer 6.
The second-stage evaporation circulation system comprises a working medium pump B10, the outlet of the working medium pump B10 is connected with the steam inlet of a heat regenerator 8, the steam outlet of the heat regenerator 8 is connected with the steam inlet of an evaporator B7, the steam outlet of the evaporator B7 is connected with an expander B4, the expander B4 is connected with a generator B5, and the outlet of the expander B4 is connected with the inlet of a steam mixer 6.
The mixing system comprises a steam mixer 6, the outlet of the steam mixer 6 is connected with the exhaust steam inlet of a heat regenerator 8, the exhaust steam outlet of the heat regenerator 8 is connected with the exhaust steam inlet of a condenser 9, and the exhaust steam outlet of the condenser 9 is respectively connected with a working medium pump A11 and a working medium pump B10.
For a clearer explanation of the scope of protection of the invention, the following is explained further in conjunction with the working process of the invention:
a part of working medium A is pressurized to a supercritical state by a working medium pump A11, then is pumped into a steam inlet of an evaporator A1, is heated to the supercritical state in an evaporator A1, does not need to pass through a two-phase region, high-temperature and high-pressure steam working medium enters an inlet of an expander A2, and expands in the expander A2 to do work, and the shaft work of the expander A2 drives a generator A3 to rotate to generate power.
The other part of working medium B is pumped into a steam inlet of the heat regenerator 8 by a working medium pump B10, heat exchange is carried out between the working medium B and steam coming out of the steam mixer 6 in the heat regenerator 8, the working medium B after heat exchange enters a steam inlet of an evaporator B7, heat exchange is carried out between the working medium B and exhaust steam of the working medium A coming out of an expander A2 in an evaporator B7, then the working medium B enters an expander B4, and the expansion working is carried out in an expander B4 to drive a generator B5 to generate power.
The exhaust steam of the working medium B from the expansion machine B4 and the exhaust steam of the working medium A after heat exchange enter the steam mixer 6 together. The exhaust steam from the steam mixer 6 enters the exhaust steam inlet of the condenser 9 after heat exchange in the heat regenerator 8, and heat is transferred to cooling water in the condenser 9 to be changed into a low-temperature low-pressure liquid working medium. The liquid working medium comes out from the outlet of the condenser 9 and then is divided into two parts: the system comprises a working medium A and a working medium B, wherein the working medium A enters a working medium pump A, the working medium B enters a working medium pump B, and then the next cycle is carried out.
The utility model provides a cycle working medium can adopt pure working medium R115, R125, R143a or R218 to and mixed working medium R404a or R507a, in this embodiment, the R115 refrigerant can be selected to cycle working medium, and the critical pressure and the critical temperature of this working medium are 3.1MPa and 80 ℃ respectively, and supercritical state means that this pressure and temperature all exceed a state of this critical pressure and critical temperature's value.
The above embodiments are only used for illustrating the design ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all the equivalent changes or modifications made according to the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.
Claims (4)
1. An organic Rankine cycle system of supercritical double-expansion two-stage heat regeneration is characterized by comprising a first-stage evaporation cycle system, a second-stage evaporation cycle system and a mixing system,
the first-stage evaporation cycle comprises a working medium pump A (11), the outlet of the working medium pump A (11) is connected with the steam inlet of an evaporator A (1), the steam outlet of the evaporator A (1) is connected with an expander A (2), the expander A (2) is connected with a generator A (3), the outlet of the expander A (2) is connected with the exhaust steam inlet of an evaporator B (7), and the exhaust steam outlet of the evaporator B (7) is connected with the inlet of a steam mixer (6);
the second-stage evaporation circulation system comprises a working medium pump B (10), the outlet of the working medium pump B (10) is connected with the steam inlet of a heat regenerator (8), the steam outlet of the heat regenerator (8) is connected with the steam inlet of an evaporator B (7), the steam outlet of the evaporator B (7) is connected with an expander B (4), the expander B (4) is connected with a generator B (5), and the outlet of the expander B (4) is connected with the inlet of a steam mixer (6);
the mixing system comprises a steam mixer (6), the outlet of the steam mixer (6) is connected with the exhaust steam inlet of a heat regenerator (8), the exhaust steam outlet of the heat regenerator (8) is connected with the exhaust steam inlet of a condenser (9), and the exhaust steam outlet of the condenser (9) is respectively connected with a working medium pump A (11) and a working medium pump B (10).
2. The supercritical double-expansion two-stage regenerative organic Rankine cycle system according to claim 1, wherein the working fluid pump A (11) pressurizes the cycle working fluid to a supercritical state.
3. The supercritical double-expansion two-stage regenerative organic Rankine cycle system according to claim 1, wherein the evaporator A (1) heats a cycle fluid to a critical state.
4. The supercritical double-expansion two-stage regenerative organic Rankine cycle system according to claim 1, wherein the cycle working medium can be pure working medium R115, R125, R143a or R218, or mixed working medium R404a or R507 a.
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| CN201920078372.4U CN209875237U (en) | 2019-01-17 | 2019-01-17 | Supercritical double-expansion two-stage regenerative organic Rankine cycle system |
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| CN201920078372.4U CN209875237U (en) | 2019-01-17 | 2019-01-17 | Supercritical double-expansion two-stage regenerative organic Rankine cycle system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109812309A (en) * | 2019-01-17 | 2019-05-28 | 江苏大学 | A kind of organic rankine cycle system of overcritical double expansion two-stage backheats |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109812309A (en) * | 2019-01-17 | 2019-05-28 | 江苏大学 | A kind of organic rankine cycle system of overcritical double expansion two-stage backheats |
| CN109812309B (en) * | 2019-01-17 | 2024-06-07 | 江苏大学 | Supercritical double-expansion two-stage backheating organic Rankine cycle system |
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Granted publication date: 20191231 |