CN113323736A - Two-stage supercharging organic Rankine cycle system with injection heat regenerator - Google Patents
Two-stage supercharging organic Rankine cycle system with injection heat regenerator Download PDFInfo
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- CN113323736A CN113323736A CN202110802741.1A CN202110802741A CN113323736A CN 113323736 A CN113323736 A CN 113323736A CN 202110802741 A CN202110802741 A CN 202110802741A CN 113323736 A CN113323736 A CN 113323736A
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- working medium
- condenser
- medium pump
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
-
- 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
- F01K21/00—Steam engine plants not otherwise provided for
- F01K21/005—Steam engine plants not otherwise provided for using mixtures of liquid and steam or evaporation of a liquid by expansion
Abstract
The invention discloses a two-stage supercharging organic Rankine cycle system with an ejector heat regenerator, which structurally comprises a primary working medium pump, the ejector heat regenerator, a secondary working medium pump, an evaporator, an expander, a generator, a condenser, a liquid storage tank, a first valve and a second valve, wherein the outlet of the primary working medium pump is sequentially connected with the ejector heat regenerator, the secondary working medium pump, the evaporator, the expander, the second valve, the condenser and the liquid storage tank; the fluid on one side of the condenser is dead steam from the expansion machine, and the fluid on the other side of the condenser is fluid from an external cold source. The invention utilizes the ejection heat regenerator, recovers the heat in the exhaust gas after the expansion machine by adopting a direct contact heat exchange mode, reduces the area of the condenser, reduces the initial investment and improves the heat efficiency of the system.
Description
Technical Field
The invention relates to an organic Rankine cycle system, in particular to a two-stage supercharging organic Rankine cycle system with an injection regenerator.
Background
Compared with the traditional Rankine cycle, the organic Rankine cycle system has lower efficiency, but has great utilization value in many fields because the system has simple structure and can convert the energy which cannot be converted by the traditional mode into the electric energy, and the system is gradually accepted by people.
Compared with the traditional Rankine cycle system, the organic Rankine cycle has the advantages that the energy conversion efficiency is limited due to the fact that the temperature of a utilized heat source is low, at present, in order to improve the efficiency of the organic Rankine cycle system, many researchers focus on an expander and working medium screening, energy stored in exhaust steam which generates electricity is ignored, usually, the part of energy is directly discharged to the outside in a condenser, and the part of heat accounts for about 95% of heat absorbed by the system, so that how to recycle the part of heat is another way for improving the efficiency of the organic Rankine cycle system.
The two-stage supercharging organic Rankine cycle system with the ejection heat regenerator provided by the invention can reduce the heat exchange area of the condenser while recovering the heat in the exhaust gas after the expansion machine, thereby reducing the system cost.
Disclosure of Invention
The invention mainly solves the technical problem of providing a two-stage supercharging organic Rankine cycle system with an injection regenerator, wherein a condensed liquid working medium is preheated by utilizing partial exhaust steam behind an expansion machine in a direct contact type heat exchange mode, so that the heat discharged to the outside is reduced, the heat exchange area of a condenser is reduced, the investment cost is reduced, and the economical efficiency is improved.
In order to solve the technical problems, the invention adopts a technical scheme that: provided is a two-stage supercharging organic Rankine cycle system with an injection regenerator, which comprises: the system comprises a primary working medium pump, an injection heat regenerator, a secondary working medium pump, an evaporator, an expander, a generator, a condenser, a liquid storage tank, a first valve and a second valve, wherein the outlet of the primary working medium pump is sequentially connected with the injection heat regenerator, the secondary working medium pump, the evaporator, the expander, the second valve, the condenser and the liquid storage tank; the second inlet of the injection regenerator is connected with the outlet of the expansion machine through a first valve; the expander is connected with a generator; the fluid in the closed system formed by the connection of the components is a low-boiling-point organic working medium, the organic working medium absorbs heat in the evaporator and changes from a liquid state to a gas state, and the organic working medium releases heat in the condenser and changes from the gas state to the liquid state; the fluid on one side of the evaporator is liquid organic working medium from the secondary working medium pump, and the fluid on the other side of the evaporator is external heat source fluid; fluid on one side of the condenser is dead steam from the expansion machine, and fluid on the other side of the condenser is fluid from an external cold source;
compared with the prior art, the invention has the following beneficial effects:
in the traditional organic Rankine cycle system, most of heat absorbed by an organic working medium in an evaporator is discharged to the outside in a condenser, only 2-10% of heat is converted into electric energy in an expander, a large amount of heat is discharged, a large condensation area is needed, the initial investment cost of the system is high, the heat of exhaust steam behind the expander is recycled by the prior art, a solid-wall heat exchanger is mainly utilized, the heat exchange efficiency of one side of the mode is low, in addition, an additional heat exchanger needs to be added, and the initial investment is increased. In addition, because part of the exhaust gas after the expander does not enter the condenser for condensation, the heat exchange area of the condenser is reduced, and the aim of reducing the system counterfeiting is fulfilled. In addition, the amount of heat discharged to the outside through the condenser is reduced, and thus the overall efficiency of the system is improved.
Drawings
FIG. 1 is a schematic diagram of a two-stage supercharging organic Rankine cycle system with ejector recuperator;
in the figure: 1. the system comprises a primary working medium pump, a secondary working medium pump, an injection regenerator, a secondary working medium pump, an evaporator, a secondary working medium pump, an expander, a generator, a condenser, a liquid storage tank, a first valve, a second valve and a third valve, wherein the primary working medium pump 2, the injection regenerator 3, the secondary working medium pump 4, the evaporator 5, the expander, the generator, the condenser 7, the liquid storage tank 9, the first valve, the second valve 10 and the third valve are sequentially connected.
Detailed Description
The principles and systems of the present invention are further described by way of example with reference to the accompanying drawings. It should be noted that the present embodiments are illustrative and not restrictive, and the scope of the invention is not limited thereto.
The system comprises a primary working medium pump (1), an ejector heat regenerator (2), a secondary working medium pump (3), an evaporator (4), an expander (5), a generator (6), a condenser (7), a liquid storage tank (8), a first valve (9) and a second valve (10), wherein an outlet of the primary working medium pump (1) is sequentially connected with the ejector heat regenerator (2), the secondary working medium pump (3), the evaporator (4), the expander (5), the second valve (10), the condenser (7) and the liquid storage tank (8); the second inlet of the ejector regenerator (2) is connected with the outlet of the expander (5) through a first valve (9); the expander (5) is connected with the generator (6); the evaporator
(4) One side of the fluid comes from the secondary working medium pump (3), and the other side of the fluid comes from the external heat source fluid; fluid on one side of the condenser (7) is dead steam from the expansion machine (5), and fluid on the other side of the condenser is fluid from an external cold source
As shown in fig. 1, a two-stage supercharging organic rankine cycle system with ejector regenerator includes: the system comprises a primary working medium pump (1), an ejector heat regenerator (2), a secondary working medium pump (3), an evaporator (4), an expander (5), a generator (6), a condenser (7), a liquid storage tank (8), a first valve (9) and a second valve (10), wherein an outlet of the primary working medium pump (1) is sequentially connected with the ejector heat regenerator (2), the secondary working medium pump (3), the evaporator (4), the expander (5), the second valve (10), the condenser (7) and the liquid storage tank (8); the second inlet of the ejector regenerator (2) is connected with the outlet of the expander (5) through a first valve (9); the expander (5) is connected with the generator (6); fluid on one side of the evaporator (4) comes from the secondary working medium pump (3), and fluid on the other side comes from external heat source fluid; fluid on one side of the condenser (7) is dead steam from the expansion machine (5), and fluid on the other side of the condenser is fluid from an external cold source.
As an embodiment, R245fa is selected as a working medium for system operation, the evaporation pressure in an evaporator is set to be 1.0MPa, and the condensation pressure in a condenser is set to be 0.18 MPa. Liquid working medium is changed into high-temperature high-pressure gas at 90 ℃ in the evaporator, then the high-temperature high-pressure gas enters the expansion machine to do work, the temperature of the expanded exhaust gas is 42.3 ℃, 85% of the exhaust gas enters the condenser to be condensed into liquid, then the liquid enters the ejector heat regenerator through the primary working medium pump in a pressurizing mode, the 15% of the exhaust gas directly enters the ejector heat regenerator to perform mixed heat exchange, then the liquid enters the secondary working medium pump in a pressurizing mode, enters the evaporator to absorb heat after the secondary pressurization, becomes high-temperature high-pressure gas, and enters the expansion machine again to do work, and therefore a cycle is completed.
In the embodiment, the waste heat in the exhaust gas of the expansion machine is fully utilized to preheat the working medium in front of the evaporator, compared with the traditional organic Rankine cycle system, the heat exchange area of the condenser is reduced by 15%, and the power generation efficiency of the system is improved by 13.3%.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (3)
1. The utility model provides a two-stage pressure boost has organic rankine cycle system who draws regenerator which characterized in that: the system comprises a primary working medium pump (1), an injection heat regenerator (2), a secondary working medium pump (3), an evaporator (4), an expander (5), a generator (6), a condenser (7), a liquid storage tank (8), a first valve (9) and a second valve (10), wherein an outlet of the primary working medium pump (1) is sequentially connected with the injection heat regenerator (2), the secondary working medium pump (3), the evaporator (4), the expander (5), the second valve (10), the condenser (7) and the liquid storage tank (8); the second inlet of the ejector regenerator (2) is connected with the outlet of the expander (5) through a first valve (9); the expander (5) is connected with the generator (6); fluid on one side of the evaporator (4) comes from the secondary working medium pump (3), and fluid on the other side comes from external heat source fluid; fluid on one side of the condenser (7) is dead steam from the expansion machine (5), and fluid on the other side of the condenser is fluid from an external cold source.
2. The two-stage supercharging organic Rankine cycle system with an ejector regenerator according to claim 1, wherein: one path of exhaust steam from the expansion machine (5) is fully mixed with liquid from the primary working medium pump (1) in the injection heat regenerator (2).
3. The two-stage supercharging organic Rankine cycle system with ejector regenerator according to claim 1 and claim 2, wherein: the opening degrees of the first valve (9) and the second valve (10) can be adjusted, so that different mixing ratios in the ejector regenerator (2) can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802741.1A CN113323736A (en) | 2021-07-15 | 2021-07-15 | Two-stage supercharging organic Rankine cycle system with injection heat regenerator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110802741.1A CN113323736A (en) | 2021-07-15 | 2021-07-15 | Two-stage supercharging organic Rankine cycle system with injection heat regenerator |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002303105A (en) * | 2001-04-09 | 2002-10-18 | Mayekawa Mfg Co Ltd | Two-phase separation rankine cycle |
| CN102562179A (en) * | 2012-01-17 | 2012-07-11 | 天津大学 | Organic Rankine cycle power generation system with liquid ejection device |
| CN107503814A (en) * | 2017-08-23 | 2017-12-22 | 天津商业大学 | Organic Rankine cycle power generation system with injecting type gas-liquid mixed regenerative apparatus |
| CN111456822A (en) * | 2020-04-20 | 2020-07-28 | 高冠怡 | Dual-working-medium organic Rankine cycle power generation system and control method thereof |
| FR3098285A1 (en) * | 2019-07-02 | 2021-01-08 | Psa Automobiles Sa | RANKINE THERMODYNAMIC CYCLE SYSTEM INTEGRATED WITH EJECTOR AIR CONDITIONING LOOP |
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2021
- 2021-07-15 CN CN202110802741.1A patent/CN113323736A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002303105A (en) * | 2001-04-09 | 2002-10-18 | Mayekawa Mfg Co Ltd | Two-phase separation rankine cycle |
| CN102562179A (en) * | 2012-01-17 | 2012-07-11 | 天津大学 | Organic Rankine cycle power generation system with liquid ejection device |
| CN107503814A (en) * | 2017-08-23 | 2017-12-22 | 天津商业大学 | Organic Rankine cycle power generation system with injecting type gas-liquid mixed regenerative apparatus |
| FR3098285A1 (en) * | 2019-07-02 | 2021-01-08 | Psa Automobiles Sa | RANKINE THERMODYNAMIC CYCLE SYSTEM INTEGRATED WITH EJECTOR AIR CONDITIONING LOOP |
| CN111456822A (en) * | 2020-04-20 | 2020-07-28 | 高冠怡 | Dual-working-medium organic Rankine cycle power generation system and control method thereof |
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Application publication date: 20210831 |