CN205876407U - A overcritical CO2 and organic rankine combined cycle system for waste heat recovery - Google Patents
A overcritical CO2 and organic rankine combined cycle system for waste heat recovery Download PDFInfo
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- CN205876407U CN205876407U CN201620864837.5U CN201620864837U CN205876407U CN 205876407 U CN205876407 U CN 205876407U CN 201620864837 U CN201620864837 U CN 201620864837U CN 205876407 U CN205876407 U CN 205876407U
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Abstract
The utility model discloses an overcritical CO2 and organic rankine combined cycle system for waste heat recovery, including organic rankine cycle system and super supercritical carbon dioxide brayton cycle system, super supercritical carbon dioxide brayton cycle system includes carbon dioxide turbine, regenerator, precooler and compressor, organic rankine cycle system includes organic rankine cycle turbine, condenser and organic working medium pump. The utility model discloses a super supercritical carbon dioxide brayton cycle and organic rankine cycle's combination can be bigger than present water vapour circulation afterheat system generated energy, and while the system equipment is compacter, controls more in a flexible way.
Description
Technical field
This utility model relates to a kind of system, is specifically related to a kind of supercritical CO for waste heat recovery2With organic Rankine
Combined cycle system.
Background technology
Waste heat thermal source is prevalent in the middle of current industry and other field, in energy shortage and the overall background of environmental crisis
Under, improving energy utilization rate, reduce Fuel Consumption and be increasingly subject to the attention of people, UTILIZATION OF VESIDUAL HEAT IN improves utilization of energy effect exactly
The important means of rate.UTILIZATION OF VESIDUAL HEAT IN history the most for many years, and also have a lot of ripe experience and equipment.The most domestic waste heat
Utilizing the traditional steam boiler of main employing and steam turbine, thermal source is primarily directed to the high-temperature hot such as iron and steel, cement, gas turbine exhaust gas
Source, heat source temperature is many between 400 DEG C to 580 DEG C.External many employing ORC technology, current state in novel waste heat recovery system
Though in the most commonly used also promote among.ORC system is acknowledged as a kind of heat higher for the low-temperature heat source thermal efficiency
Power circulation form, it uses has macromolecule, lower boiling organic working medium replacement water as circulatory mediator, has facility compact
Feature.Although the thermal efficiency for middle low-temperature heat source ORC is higher than light water steam Rankine cycle efficiency, but its Applicable temperature is many
Being less than 300 DEG C, for the middle high temperature heat source higher than 400 DEG C, all there is thermal decomposition problem in most organic working medium.Therefore for height
If the most directly generating electricity relatively difficult with ORC recovery waste heat in the waste heat thermals source of 400 DEG C, need to find more suitably heating power
Circulation and working medium are to improve the combination property of waste heat recovery.
At present in the middle of numerous thermodynamic cycles, supercritical Brayton cycle is a kind of circulation form having superiority most.Novel
It is big that supercritical working medium (carbon dioxide, helium and nitrous oxide etc.) has energy density, and heat transfer efficiency is high, and it is congenital that system is simple etc.
Advantage, can be greatly improved heat to power output efficiency, reduces equipment volume, has the highest economy.And the works such as carbon dioxide
Matter hot physical property within the temperature range of current waste heat recovery field is sufficiently stable, there is not thermal decomposition problem, can be completely used for
High-temperature part heat recovery.But according at present the most existing be directly used in about supercritical carbon dioxide Brayton cycle remaining
From the point of view of the research of recuperation of heat, there is the problem that regenerator heat absorbing side outlet temperature is the highest, this will have a strong impact on carbon dioxide
Working medium is for the absorbtivity of waste heat heat from heat source, and then affects generated energy.Although Korea S, EPRI etc. country and research institution for
This improvement of problem carbon dioxide recycle layout, but the circulation after improving is extremely complex, it is difficult to and controlling, its performance will be very simultaneously
Compressor intercooling technology and effect thereof is depended in big degree, if cooling effect slightly deviation, all to whole system
Performance has a great impact.Therefore fully rely on the generating of supercritical carbon dioxide Brayton cycle recovery waste heat and there is also intrinsic
Defect.
If supercritical carbon dioxide Brayton cycle and ORC can be combined, then can preferably adapt to midium temperature to high temperature
The heat recovery and utilization of Duan Yure thermal source, improves the thermal efficiency, makes facility compact and controls flexibly.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, it is provided that one is better than current waste heat recovery
The supercritical CO for waste heat recovery of conventional steam power circulation system2With organic Rankine combined cycle system, this is
The system combination by supercritical carbon dioxide Brayton cycle Yu organic Rankine bottoming cycle, can effectively increase the heat of waste heat thermal source
Source utilization rate, and make system compacter, control flexibly.
For reaching above-mentioned purpose, this utility model adopts the following technical scheme that:
Supercritical CO for waste heat recovery2With organic Rankine combined cycle system, including high-temperature residual heat heat exchanger, first
Low temperature waste heat exchanger, the second low temperature waste heat exchanger, organic rankine cycle system and supercritical carbon dioxide Bretton follow
Loop systems；
High-temperature residual heat exchanger heat source outlet respectively with the first low temperature waste heat exchanger and the second low temperature waste heat exchanger
Heat source side entrance is connected；
The outlet of high-temperature residual heat heat exchanger carbon dioxide side is connected with supercritical carbon dioxide Brayton Cycle system entrance
Logical, the outlet of supercritical carbon dioxide Brayton Cycle system is divided into two-way, a road and the working medium side of the first low temperature waste heat exchanger
Entrance is connected, and another road is connected with the entrance of high-temperature residual heat heat exchanger carbon dioxide side；
The organic working medium side outlet of the second low temperature waste heat exchanger is connected with organic rankine cycle system entrance, organic Rankine
Blood circulation outlet connects with the organic working medium side entrance of the second low temperature waste heat exchanger.
This utility model is further improved by, described first low temperature waste heat exchanger and the second low temperature waste heat exchanger
In parallel.
This utility model is further improved by, and described supercritical carbon dioxide Brayton Cycle system includes titanium dioxide
Carbon turbine, regenerator, precooler and compressor；
The turbine entrance of carbon dioxide turbine is connected with the outlet of high-temperature residual heat heat exchanger carbon dioxide side, carbon dioxide
The outlet of turbine is connected with the cold side entrance of regenerator, the cold side outlet of regenerator and the working medium side entrance phase of precooler
Connection, the working medium side outlet of precooler is connected with the entrance of compressor, and the outlet of compressor is divided into two-way, a road and regenerator
Heat absorbing side entrance be connected, the outlet of the heat absorbing side of regenerator is connected with the entrance of high-temperature residual heat heat exchanger carbon dioxide side；
Another road is connected with the working medium side entrance of the first low temperature waste heat exchanger, first low temperature waste heat exchanger working medium side outlet also with
The entrance of high-temperature residual heat heat exchanger carbon dioxide side is connected.
This utility model is further improved by, described organic rankine cycle system include organic Rankine bottoming cycle turbine,
Condenser and organic working medium pump, the organic working medium side outlet of the second low temperature waste heat exchanger and entering of organic Rankine bottoming cycle turbine
Mouth is connected, and the outlet of organic Rankine bottoming cycle turbine connects with the entrance of condenser, the outlet of condenser and organic working medium pump
Entrance is connected, the organic working medium side entrance connection of organic working medium delivery side of pump and the second low temperature waste heat exchanger.
Compared with prior art, this utility model has the advantages that
Waste heat thermal source is divided into high temperature and low temperature two parts by this utility model, and the heat release working medium of waste heat thermal source is by high-temperature residual heat
Exchanger heat source entrance inputs, by exporting after transferring heat to supercritical carbon dioxide working medium in high-temperature residual heat heat exchanger
Flow out and be divided into two-way, respectively enter the low temperature waste heat exchanger with supercritical carbon dioxide working medium heat exchange and follow with organic Rankine
The low temperature waste heat exchanger of ring working medium heat exchange, two low temperature waste heat exchanger parallel connections, last waste heat heat source exhaust is by exporting discharge.
In this utility model running, when thermal source instability, in association system, the generated energy ratio of two circulations can
With change flexibly with the conversion of adaptive temperature scope.When heat source temperature keeps higher, supercritical carbon dioxide Brayton cycle
System turbine inlet temperature can be higher, and its generated energy ratio can also keep higher, to make full use of heat source high temp section heat；
When thermal source has fluctuation, waste heat heat source temperature is that supercritical carbon dioxide Brayton cycle turbine inlet temperature is relatively less than desired value
Low, its generating ratio also reduces, and major part generating will be undertaken by ORC part；When heat source temperature is less than the ORC cyclic design highest temperature
After below Du, then can be undertaken whole generated energy by ORC.And during heat source temperature and thermal change, in two circulations
Each the flow of working medium can change along with thermal source to reach best power match point accordingly.
This utility model combines supercritical carbon dioxide Brayton cycle and the respective advantage of organic Rankine bottoming cycle, compensate for
The other side's defect when waste heat recovery.Relative to existing water steam residual neat recovering system, can effectively improve generating
Power, especially when waste heat thermal source is unstable or temperature is relatively low, the relatively advantage of water steam residual neat recovering system is more
Substantially, simultaneity factor volume is little, compact, it is simple to control.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1 be carbon dioxide turbine, 2 for regenerator, 3 for precooler, 4 for compressor, 5 for high-temperature residual heat heat exchanger,
6 it is the first low temperature waste heat exchanger, 7 is the second low temperature waste heat exchanger, 8 is machine Rankine cycle turbine, 9 is condenser, 10 is
Organic working medium pump.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail:
With reference to Fig. 1, this utility model includes more than high-temperature residual heat heat exchanger the 5, first low temperature waste heat exchanger the 6, second low temperature
Heat exchanger 7, organic rankine cycle system and supercritical carbon dioxide Brayton Cycle system；
The heat release working medium of waste heat thermal source is inputted by high-temperature residual heat exchanger heat source entrance, high-temperature residual heat heat exchanger 5 thermal source
Side outlet is connected with the first low temperature waste heat exchanger 6 and the second low temperature waste heat exchanger 7 heat source side entrance respectively, the first low temperature
Afterheat heat exchanger 6 and the second low temperature waste heat exchanger 7 are in parallel.
The outlet of high-temperature residual heat heat exchanger 5 carbon dioxide side is connected with supercritical carbon dioxide Brayton Cycle system entrance
Logical, the outlet of supercritical carbon dioxide Brayton Cycle system is divided into two-way, a road and the working medium side of the first low temperature waste heat exchanger 6
Entrance is connected, and another road is connected with the entrance of high-temperature residual heat heat exchanger 5 carbon dioxide side；
The organic working medium side outlet of the second low temperature waste heat exchanger 7 is connected with organic rankine cycle system entrance, You Jilang
It agree blood circulation outlet connect with the organic working medium side entrance of the second low temperature waste heat exchanger 7.
Concrete, described supercritical carbon dioxide Brayton Cycle system includes carbon dioxide turbine 1, regenerator 2, pre-cooling
Device 3 and compressor 4；The turbine entrance of carbon dioxide turbine 1 is connected with the outlet of high-temperature residual heat heat exchanger 5 carbon dioxide side
Logical, the outlet of carbon dioxide turbine 1 is connected with the cold side entrance of regenerator 2, the cold side outlet of regenerator 2 and precooler
The working medium side entrance of 3 is connected, and the working medium side outlet of precooler 3 is connected with the entrance of compressor 4, and the outlet of compressor 4 divides
For two-way, a road is connected with the heat absorbing side entrance of regenerator 2, heat absorbing side outlet and the high-temperature residual heat heat exchanger 5 two of regenerator 2
The entrance of carbonoxide side is connected, and another road of compressor 4 outlet is connected with the working medium side entrance of the first low temperature waste heat exchanger 6
Logical, low temperature waste heat exchanger the first working medium side outlet also entrance with high-temperature residual heat heat exchanger 5 carbon dioxide side is connected.
Described organic rankine cycle system includes organic Rankine bottoming cycle turbine 8, condenser 9 and organic working medium pump 10, the
The organic working medium side outlet of two low temperature waste heat exchanger 7 is connected with the entrance of organic Rankine bottoming cycle turbine 8, organic Rankine bottoming cycle
The outlet of turbine 8 connects with the entrance of condenser 9, and the outlet of condenser 9 is connected with the entrance of organic working medium pump 10, You Jigong
The outlet of matter pump 10 connects with the organic working medium side entrance of the second low temperature waste heat exchanger 7.
Specific works process of the present utility model is:
First working medium containing high-temperature residual heat inputted by high-temperature residual heat heat exchanger 5 heat source side entrance, in high-temperature residual heat heat exchange
Being divided into two-way by outlet after transferring heat to supercritical carbon dioxide working medium in device 5, a road enters the first low temperature exhaust heat heat exchange
Low-temperature heat quantity is passed to part low temperature supercritical carbon dioxide working medium by device 6, and another road enters the second low temperature waste heat exchanger 7,
Organic working medium is transferred heat in the second low temperature waste heat exchanger 7.
Supercritical carbon dioxide working medium enters carbon dioxide turbine 1 after being heated to be high temperature in high-temperature residual heat heat exchanger 5,
Sequentially entering regenerator 2 in carbon dioxide turbine 1 after acting and precooler 3 is cooled, cooled working medium enters compressor
4, it is divided into two-way, a road to enter the heat absorption of regenerator 2 heat absorbing side after being pressurized, a road enters the first low temperature waste heat exchanger 6 working medium
Absorbing heat in side, two-way working medium is converged after absorbing low temperature exhaust heat and is again introduced into more than the carbon dioxide side absorption of high-temperature residual heat heat exchanger 5
Hot heat from heat source becomes high-temperature supercritical CO 2 fluid again.
Organic working medium organic working medium side in the second low temperature waste heat exchanger 7 enters after being heated to be high temperature organic working medium
Doing work in organic Rankine bottoming cycle turbine 8, the low pressure organic working medium after acting enters condenser 9, is cooled to liquid at condenser
After be pressurized to high pressure by organic working medium pump 10, high pressure organic working medium is again introduced into the organic working medium of the second low temperature waste heat exchanger 7
Side absorbs heat, is again heated to high temperature organic working medium.
In running when thermal source instability, in described association system, the generated energy ratio of two circulations can become flexibly
Change the conversion with adaptive temperature scope.When heat source temperature keeps higher, supercritical carbon dioxide Brayton Cycle system turbine
Inlet temperature can be higher, and its generated energy ratio can also keep higher, to make full use of heat source high temp section heat；When thermal source has
Fluctuation, when waste heat heat source temperature is less than desired value, supercritical carbon dioxide Brayton cycle turbine inlet temperature is relatively low, its generating
Ratio also reduces, and major part generating will be undertaken by ORC part；After heat source temperature is less than below ORC cyclic design maximum temperature,
Then can be undertaken whole generated energy by ORC.And during heat source temperature and thermal change, respective working medium in two circulations
Flow can change along with thermal source to reach best power match point accordingly.
Above-described detailed description of the invention, is entered the purpose of this utility model, technical scheme and beneficial effect
One step describes in detail, be it should be understood that and the foregoing is only detailed description of the invention of the present utility model, is not used to limit
This utility model processed, all within spirit of the present utility model and principle, any modification, equivalent substitution and improvement etc. done, all
Within protection domain of the present utility model should be included in.
Claims (4)
1. for the supercritical CO of waste heat recovery2With organic Rankine combined cycle system, it is characterised in that include that high-temperature residual heat changes
Hot device (5), the first low temperature waste heat exchanger (6), the second low temperature waste heat exchanger (7), organic rankine cycle system and super face
Boundary's carbon dioxide Brayton Cycle system；
High-temperature residual heat heat exchanger (5) heat source side outlet respectively with the first low temperature waste heat exchanger (6) and the second low temperature exhaust heat heat exchange
Device (7) heat source side entrance is connected；
The outlet of high-temperature residual heat heat exchanger (5) carbon dioxide side is connected with supercritical carbon dioxide Brayton Cycle system entrance
Logical, the outlet of supercritical carbon dioxide Brayton Cycle system is divided into two-way, a road and the working medium of the first low temperature waste heat exchanger (6)
Side entrance is connected, and another road is connected with the entrance of high-temperature residual heat heat exchanger (5) carbon dioxide side；
The organic working medium side outlet of the second low temperature waste heat exchanger (7) is connected with organic rankine cycle system entrance, organic Rankine
Blood circulation outlet connects with the organic working medium side entrance of the second low temperature waste heat exchanger (7).
Supercritical CO for waste heat recovery the most according to claim 12With organic Rankine combined cycle system, its feature
Being, described first low temperature waste heat exchanger (6) and the second low temperature waste heat exchanger (7) are in parallel.
Supercritical CO for waste heat recovery the most according to claim 12With organic Rankine combined cycle system, its feature
Being, described supercritical carbon dioxide Brayton Cycle system includes carbon dioxide turbine (1), regenerator (2), precooler (3)
And compressor (4)；
The turbine entrance of carbon dioxide turbine (1) is connected with the outlet of high-temperature residual heat heat exchanger (5) carbon dioxide side, titanium dioxide
The outlet of carbon turbine (1) is connected with the cold side entrance of regenerator (2), cold side outlet and the precooler (3) of regenerator (2)
Working medium side entrance be connected, the outlet of the working medium side of precooler (3) is connected with the entrance of compressor (4), going out of compressor (4)
Mouth is divided into two-way, and a road is connected with the heat absorbing side entrance of regenerator (2), the heat absorbing side outlet of regenerator (2) and high-temperature residual heat
The entrance of heat exchanger (5) carbon dioxide side is connected；Another road is connected with the working medium side entrance of the first low temperature waste heat exchanger (6)
Logical, the first low temperature waste heat exchanger (6) working medium side outlet also entrance with high-temperature residual heat heat exchanger (5) carbon dioxide side is connected
Logical.
Supercritical CO for waste heat recovery the most according to claim 12With organic Rankine combined cycle system, its feature
Being, described organic rankine cycle system includes organic Rankine bottoming cycle turbine (8), condenser (9) and organic working medium pump (10)；
The organic working medium side outlet of the second low temperature waste heat exchanger (7) is connected with the entrance of organic Rankine bottoming cycle turbine (8), has
The outlet of machine Rankine cycle turbine (8) connects with the entrance of condenser (9), the outlet of condenser (9) and organic working medium pump (10)
Entrance be connected, the outlet of organic working medium pump (10) connects with the organic working medium side entrance of the second low temperature waste heat exchanger (7).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089337A (en) * | 2016-08-10 | 2016-11-09 | 西安热工研究院有限公司 | Supercritical CO for waste heat recovery2with organic Rankine association circulating power generation system |
| CN107327325A (en) * | 2017-08-03 | 2017-11-07 | 上海发电设备成套设计研究院有限责任公司 | A kind of supercritical carbon dioxide and liquid metal combined cycle system |
| CN108612572A (en) * | 2018-07-04 | 2018-10-02 | 西安热工研究院有限公司 | A kind of supercritical carbon dioxide Brayton cycle working medium recycling system and method |
| CN109322743A (en) * | 2018-11-15 | 2019-02-12 | 中国华能集团清洁能源技术研究院有限公司 | A kind of the supercritical carbon dioxide electricity generation system and method for natural gas afterheat recycling |
| CN109944653A (en) * | 2019-04-28 | 2019-06-28 | 天津商业大学 | A kind of carbon dioxide trans-critical cycle combined power and cooling system |
-
2016
- 2016-08-10 CN CN201620864837.5U patent/CN205876407U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089337A (en) * | 2016-08-10 | 2016-11-09 | 西安热工研究院有限公司 | Supercritical CO for waste heat recovery2with organic Rankine association circulating power generation system |
| CN106089337B (en) * | 2016-08-10 | 2017-07-07 | 西安热工研究院有限公司 | For the supercritical CO of waste heat recovery2With organic Rankine association circulating power generation system |
| CN107327325A (en) * | 2017-08-03 | 2017-11-07 | 上海发电设备成套设计研究院有限责任公司 | A kind of supercritical carbon dioxide and liquid metal combined cycle system |
| CN107327325B (en) * | 2017-08-03 | 2023-08-29 | 上海发电设备成套设计研究院有限责任公司 | Supercritical carbon dioxide and liquid metal combined cycle system |
| CN108612572A (en) * | 2018-07-04 | 2018-10-02 | 西安热工研究院有限公司 | A kind of supercritical carbon dioxide Brayton cycle working medium recycling system and method |
| CN108612572B (en) * | 2018-07-04 | 2024-03-12 | 西安热工研究院有限公司 | Supercritical carbon dioxide Brayton cycle working medium recovery system and method |
| CN109322743A (en) * | 2018-11-15 | 2019-02-12 | 中国华能集团清洁能源技术研究院有限公司 | A kind of the supercritical carbon dioxide electricity generation system and method for natural gas afterheat recycling |
| CN109944653A (en) * | 2019-04-28 | 2019-06-28 | 天津商业大学 | A kind of carbon dioxide trans-critical cycle combined power and cooling system |
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