CN104832232B - A kind of step heat exchange organic Rankine cycle power generation system and electricity-generating method thereof - Google Patents
A kind of step heat exchange organic Rankine cycle power generation system and electricity-generating method thereof Download PDFInfo
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- CN104832232B CN104832232B CN201510243498.9A CN201510243498A CN104832232B CN 104832232 B CN104832232 B CN 104832232B CN 201510243498 A CN201510243498 A CN 201510243498A CN 104832232 B CN104832232 B CN 104832232B
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Abstract
A kind of step heat exchange organic Rankine cycle power generation system and electricity-generating method thereof, comprise high pressure evaporator, high pressure pre-heater, high pressure exhaust steam regenerator, decompressor and condenser, low pressure evaporator, low pressure preheater (LPP and low pressure exhaust steam regenerator, wherein the shell-side outlet of high pressure evaporator is connected to high pressure pre-heater and low pressure evaporator by pipeline, its pipe side outlet is connected with decompressor by pipeline, decompressor is connected to generator, decompressor is provided with gas supplementing opening, low pressure preheater (LPP is connected to low pressure evaporator, low pressure evaporator pipe side outlet is communicated with gas supplementing opening, the relief opening of decompressor is connected to high pressure exhaust steam regenerator, the outlet of high pressure exhaust steam regenerator is connected to low pressure exhaust steam regenerator, the shell-side outlet of low pressure exhaust steam regenerator is connected to condenser, the pipe side outlet of condenser is connected with liquid container, liquid container outlet side connects multiple working medium pump, reduce the irreversible loss in high pressure pre-heater, improve the thermal source grade of low pressure preheater (LPP, make full use of the energy.
Description
Technical field
The invention belongs to low-grade energy and utilize field, particularly relate to a kind of system utilizing low-grade energy to carry out organic Rankine bottoming cycle generating.
Background technique
What China's economic development brought rapidly thereupon is the shortage of the energy and serious environmental pollution, on the one hand there is mass energy in fields such as iron and steel, building, traffic with form of heat to be discharged, and recycles difficulty high; On the other hand the natural resources such as geothermal power, solar energy utilize lower grade, cannot Appropriate application.Therefore nowadays, how Appropriate application is carried out to the energy, become the important channel alleviating China's energy and environmental problem.
In the recycling of low-grade energy, organic Rankine bottoming cycle forces down the feature of boiling be widely used because its working medium has height, but for most thermal source, at system outlet place, heat source temperature, still up to about 340K, makes the energy recovery rate and systematic function all lower.If again utilize system outlet place thermal source, then because its grade is lower, cost recovery is higher, has certain recovery difficult.
Therefore, a kind of better heat source recovery system of design is necessary.
Summary of the invention
For prior art Problems existing, the invention provides a kind of from rising thermal source grade, step heat exchange organic Rankine cycle power generation system and the electricity-generating method thereof of cascade utilization can be carried out thermal source.
In order to realize object, the present invention adopts following technological scheme:
A kind of step heat exchange organic Rankine cycle power generation system, comprise high pressure organic Rankine cycle devices and low pressure organic Rankine cycle devices, described high pressure organic Rankine cycle devices has high pressure evaporator, high pressure pre-heater, high pressure exhaust steam regenerator, decompressor and condenser, described low pressure organic Rankine cycle devices has low pressure evaporator, low pressure preheater (LPP and low pressure exhaust steam regenerator, wherein the shell-side outlet of high pressure evaporator is connected to described high pressure pre-heater and described low pressure evaporator by pipeline, its pipe side outlet is connected with described decompressor by pipeline, described decompressor is connected to generator, described decompressor is provided with gas supplementing opening, described low pressure preheater (LPP is connected to described low pressure evaporator, described low pressure evaporator pipe side outlet is communicated with described gas supplementing opening, the relief opening of described decompressor is connected to described high pressure exhaust steam regenerator, the outlet of described high pressure exhaust steam regenerator is connected to described low pressure exhaust steam regenerator, the shell-side outlet of described low pressure exhaust steam regenerator is connected to described condenser, the pipe side outlet of described condenser is connected with liquid container, described liquid container outlet side connects multiple working medium pump.
Further, flowmeter and flow control valve is equipped with between described high pressure evaporator and described high pressure pre-heater, described low pressure evaporator.
Further, described condenser is connected with cooling water intake, and Cooling Water enters with cooling working medium.
Further, described liquid container and described high pressure pre-heater and described low pressure preheater (LPP are by pipeline communication, and described pipeline is provided with the first control valve.
Further, described liquid container is communicated with described low pressure exhaust steam regenerator, is provided with described working medium pump and the second control valve between the two.
Further, described low pressure exhaust steam regenerator is communicated with described low pressure preheater (LPP, and described high pressure exhaust steam regenerator is communicated with described high pressure pre-heater.
A kind of electricity-generating method based on above-mentioned step heat exchange organic Rankine cycle power generation system, comprise: thermal source is shunted after entering described high pressure evaporator, enter described high pressure pre-heater and described low pressure evaporator respectively, source part in described low pressure evaporator enters in described low pressure preheater (LPP, working medium through described high pressure exhaust steam regenerator outflow enters in described high pressure pre-heater and enters the evaporation of described high pressure evaporator after preheating, steam enters in described decompressor, drive described electrical power generators, the evaporation of described low pressure evaporator is entered after same working medium enters described low pressure preheater (LPP preheating simultaneously, steam enters described decompressor by described gas supplementing opening, cool from entering again in described condenser after described decompressor described working medium out enters described high pressure exhaust steam regenerator and described low pressure exhaust steam regenerator, cooled described working medium flows into described liquid container.
Further, after described working medium discharges heat energy in described decompressor, flowed out by described relief opening, if the exhaust steam temperature of described relief opening is higher, described working medium enters described high pressure exhaust steam regenerator, if the exhaust steam temperature of described relief opening is lower, then described working medium directly enters described condenser.
Further, when described exhaust steam temperature is higher, the described working medium that described condenser flows out promotes to enter in described low pressure exhaust steam regenerator by described working medium pump and heats, then shunt, described working medium part directly enters described low pressure preheater (LPP, another part boosts to high pressure conditions through described working medium pump and enters in described high pressure exhaust steam regenerator again and heat, and enters described high pressure pre-heater.
Further, when described exhaust steam temperature is lower, the described working medium in described liquid container is directly delivered in described high pressure pre-heater and described low pressure preheater (LPP by described working medium pump.
Beneficial effect of the present invention:
(1) by entering in high pressure pre-heater and low pressure evaporator after the shunting of high pressure evaporator control of export thermal source, reduce the irreversible loss in high pressure pre-heater, evaporating temperature in high pressure evaporator and the heat source temperature in low pressure preheater (LPP are raised, on the basis that former thermal source is constant, improve the thermal source grade of low pressure preheater (LPP, low pressure stage circulation can be circulated with high pressure stage and adopt same working medium;
(2) decompressor is provided with gas supplementing opening, and the steam in low pressure evaporator enters in gas supplementing opening, provides energy to do work to decompressor, all can utilize, fully realize energy cascade utilization, reduce equipment investment simultaneously the thermal source of different temperatures;
(3) heat that working medium is carried both fully had been reclaimed in the use of high pressure exhaust steam regenerator and low pressure exhaust steam regenerator, turn improve temperature when working medium enters high pressure pre-heater and low pressure preheater (LPP, reduce irreversible loss in condenser, make to there is multi-stage heat exchanger in whole system, make full use of the energy.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention;
In figure, 1-high pressure evaporator, 2-high pressure pre-heater, 3-decompressor, 31-gas supplementing opening, 4-high pressure exhaust steam regenerator, 5-condenser, 6-liquid container, 7-low pressure evaporator, 8-low pressure preheater (LPP, 9-low pressure exhaust steam regenerator, 10-flowmeter, 11-flow control valve, the 12-the first control valve, the 13-the second control valve, 14-generator, 15-working medium pump.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of step heat exchange organic Rankine cycle power generation system of the present invention comprises high pressure organic Rankine cycle devices and low pressure organic Rankine cycle devices.
High pressure organic Rankine cycle devices comprises high pressure evaporator 1, high pressure pre-heater 2, high pressure exhaust steam regenerator 4, decompressor 3, condenser 5 and liquid container 6, and low pressure organic Rankine cycle devices comprises low pressure evaporator 7, low pressure preheater (LPP 8 and low pressure exhaust steam regenerator 9.The shell-side inlet of high pressure evaporator 1 is connected with thermal source delivery pipe, high pressure evaporator 1 shell-side outlet is connected to described high pressure pre-heater 2 and described low pressure evaporator 7 by pipeline, be equipped with flowmeter 10 and flow control valve 11 between high pressure evaporator 1 and described high pressure pre-heater 2, low pressure evaporator 7, adjust by flow control valve 11 and flowmeter 10 amount that thermal source enters high pressure pre-heater 2 and low pressure evaporator 7 respectively.The pipe side outlet of high pressure pre-heater 2 connects the pipe side entrance with high pressure evaporator 1, and the pipe side entrance of high pressure pre-heater 2 is communicated with liquid container 6, is provided with the first control valve 12 between the two.The pipe side outlet of high pressure evaporator 1 is connected to decompressor 3 by pipeline, the rear end of decompressor 3 is connected with generator 14, the lower end of decompressor 3 is provided with gas supplementing opening 31, the relief opening of decompressor 3 is connected to high pressure exhaust steam regenerator 4, be provided with valve between the two, the relief opening of decompressor 3 is connected with condenser 5 simultaneously, and be also provided with valve between the two, pipeline communication is passed through in the outlet of high pressure exhaust steam regenerator 4 and the pipe side entrance of high pressure pre-heater 2.
The shell-side inlet of low pressure evaporator 7 is connected with the shell-side outlet of high pressure evaporator 1, be provided with flowmeter 10 and flow control valve 11 between the two, the shell-side outlet of low pressure evaporator 7 is communicated with low pressure preheater (LPP 8 shell-side inlet, the pipe side entrance of low pressure preheater (LPP 8 is connected with liquid container 6, be provided with the first control valve 12 between the two, the pipe side entrance of low pressure preheater (LPP 8 is connected with the outlet of low pressure exhaust steam regenerator 9 simultaneously, also valve is provided with between the two, the pipe side outlet of low pressure preheater (LPP 8 is communicated with the pipe side entrance of low pressure evaporator 7, the pipe side outlet of low pressure evaporator 7 is communicated with gas supplementing opening 31 by pipeline.Entrance and the outlet with high pressure exhaust steam regenerator 4 of low pressure exhaust steam regenerator 9, its outlet is communicated with condenser 5, simultaneously, the entrance of low pressure exhaust steam regenerator 9 is communicated with liquid container 6, be provided with working medium pump 15 and the second control valve 13 between the two, the outlet of low pressure exhaust steam regenerator 9 is communicated with the entrance of high pressure exhaust steam regenerator 4.
Condenser 5 is provided with cooling water intake and coolant outlet, cooling water inlet is connected with cooling water pipeline, condenser is connected to the outlet of low pressure exhaust steam regenerator 9 and the outlet of decompressor 3 simultaneously, when decompressor 3 air outlet exhaust steam temperature is lower, working medium without high pressure exhaust steam regenerator 4, and directly enters in condenser 5.
Electricity-generating method based on above-mentioned power generation system is as follows:
Thermal source enters in high pressure evaporator 1 by the shell-side inlet of high pressure evaporator 1, and in the present embodiment, thermal source is the low-temperature heat source that all exist with sensible heat form, as geothermal water, flue gas etc.After entering the working medium heat exchange in the rear thermal source of high pressure evaporator 1 and high pressure evaporator 1 pipe, thermal source is flowed out by shell-side outlet and shunts and enters in high pressure pre-heater 2 and low pressure evaporator 7, wherein thermal source carries out heat exchange with working medium wherein in high pressure pre-heater 2, discharge after thermal source heat release, thermal source simultaneously in low pressure evaporator 7 heats working medium wherein in low pressure evaporator 7, then thermal source flows in low pressure preheater (LPP 8 and carries out heat exchange with working medium wherein, discharges after thermal source heat exchange.The thermal source content that shunting enters in high pressure pre-heater 2 and low pressure evaporator 7 after high pressure evaporator 1 is regulated by flowmeter 10 and flow control valve 11, reduce the irreversible loss in high pressure pre-heater 2, evaporating temperature in high pressure evaporator 1 and the heat source temperature in low pressure preheater (LPP 8 are raised, on the basis that former thermal source is constant, improve low pressure stage preheater 8 thermal source grade.
Working medium is there is in this power generation system, preferably, it is organic working medium, in the circulatory system, working medium is extracted out by working medium pump 15 by liquid container 6, enter in high pressure pre-heater 2 and low pressure preheater (LPP 8 respectively, heat exchange is carried out with thermal source wherein, thus working medium is heated, then working medium enters in the pipe of high pressure evaporator 1 and low pressure evaporator 7 again, with thermal source heat exchange and then by heating evaporation in high pressure evaporator 1, form high pressure steam, this high pressure steam enters drive electrical generators 14 in decompressor 3 and generates electricity, working medium simultaneously in low pressure evaporator 7 also with after thermal source heat exchange forms low pressure steam, low pressure steam enters in decompressor 3 by gas supplementing opening 31, energy is provided to do work to decompressor 3, therefore power generation system of the present invention all can utilize the thermal source of different temperatures, fully realize energy cascade utilization, equipment investment can be reduced simultaneously.Discharged by the relief opening of decompressor 3 after high pressure steam and low pressure steam release energy in decompressor 3, if now relief opening exhaust steam temperature is higher, the working medium that such as relief opening is discharged is gaseous state, then working medium enters heat exchange in high pressure exhaust steam regenerator 4, enter heat exchange in low pressure exhaust steam regenerator 9 again, then enter in condenser 5 and cool, finally flow into liquid container 6; If relief opening exhaust steam temperature is lower, the working medium that such as relief opening is discharged is liquid, then working medium directly enters in condenser 5 and flows into liquid container 6 after cooling.
Exhaust steam temperature also controls path during working medium outflow in liquid container 6.If when exhaust steam temperature is higher, first control valve 12 is closed, second control valve 13 is opened, working medium in liquid container 6 promotes to enter in low pressure exhaust steam regenerator 9 and heats by working medium pump 15, then valve regulated is passed through, working medium part enters in low pressure preheater (LPP 8, and another part enters in high pressure pre-heater 2 after entering and heating further in high pressure exhaust steam regenerator 4.The heat that working medium is carried both fully had been reclaimed in the use of high pressure exhaust steam regenerator 4 and low pressure exhaust steam regenerator 9, turn improve temperature when working medium enters high pressure pre-heater 2 and low pressure preheater (LPP 8, reduce irreversible loss in condenser 5, make to there is multi-stage heat exchanger in whole system, make full use of the energy.If when exhaust steam temperature is lower, the first control valve 12 is opened, and the second control valve 13 is closed, and working medium pump 15 directly enters in high pressure pre-heater 2 and low pressure preheater (LPP 8 after the working medium in liquid container 6 being extracted out.
Above embodiment is only in order to illustrate technological scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those skilled in the art are to be understood that, can modify to technological scheme of the present invention or equivalent replacement, and not departing from aim and the scope of the technical program, it all should be encompassed in right of the present invention.
Claims (6)
1. a step heat exchange organic Rankine cycle power generation system, is characterized in that, comprising: high pressure organic Rankine cycle devices and low pressure organic Rankine cycle devices, described high pressure organic Rankine cycle devices has high pressure evaporator, high pressure pre-heater, high pressure exhaust steam regenerator, decompressor and condenser, described low pressure organic Rankine cycle devices has low pressure evaporator, low pressure preheater (LPP and low pressure exhaust steam regenerator, wherein the shell-side outlet of high pressure evaporator is connected to described high pressure pre-heater and described low pressure evaporator by pipeline, its pipe side outlet is connected with described decompressor by pipeline, described decompressor is connected to generator, described decompressor is provided with gas supplementing opening, described low pressure preheater (LPP is connected to described low pressure evaporator, described low pressure evaporator pipe side outlet is communicated with described gas supplementing opening, the relief opening of described decompressor is connected to described high pressure exhaust steam regenerator, the outlet of described high pressure exhaust steam regenerator is connected to described low pressure exhaust steam regenerator, the shell-side outlet of described low pressure exhaust steam regenerator is connected to described condenser, the pipe side outlet of described condenser is connected with liquid container, described liquid container outlet is connected to described high pressure pre-heater by pipeline, described low pressure preheater (LPP and described low pressure exhaust steam regenerator, described pipeline is provided with working medium pump, described high pressure pre-heater, the first control valve is provided with between described low pressure preheater (LPP and described liquid container, the second control valve is provided with between described low pressure exhaust steam regenerator and described liquid container, described first control valve and described second control valve is selectable opens.
2. step heat exchange organic Rankine cycle power generation system according to claim 1, is characterized in that: be equipped with flowmeter and flow control valve between described high pressure evaporator and described high pressure pre-heater, described low pressure evaporator.
3. step heat exchange organic Rankine cycle power generation system according to claim 1, is characterized in that: described condenser is connected with cooling water intake, and Cooling Water enters with cooling working medium.
4. step heat exchange organic Rankine cycle power generation system according to claim 1, is characterized in that: described low pressure exhaust steam regenerator is communicated with described low pressure preheater (LPP, and described high pressure exhaust steam regenerator is communicated with described high pressure pre-heater.
5. the electricity-generating method based on step heat exchange organic Rankine cycle power generation system according to claim 1, it is characterized in that, comprise: thermal source is shunted after entering described high pressure evaporator, enter described high pressure pre-heater and described low pressure evaporator respectively, source part in described low pressure evaporator enters in described low pressure preheater (LPP, working medium through described high pressure exhaust steam regenerator outflow enters in described high pressure pre-heater and enters the evaporation of described high pressure evaporator after preheating, steam enters in described decompressor, drive described electrical power generators, the evaporation of described low pressure evaporator is entered after same working medium enters described low pressure preheater (LPP preheating simultaneously, steam enters described decompressor by described gas supplementing opening, after described working medium discharges heat energy in described decompressor, flowed out by described relief opening, if the exhaust steam temperature of described relief opening is higher, described working medium enters described high pressure exhaust steam regenerator, and described liquid container is flowed into after described low pressure exhaust steam regenerator and described condenser, close described first control valve simultaneously, open described second control valve, described working medium in described liquid container promotes and enters described low pressure exhaust steam regenerator by described working medium pump, if the exhaust steam temperature of described relief opening is lower, the described working medium flowed out by described relief opening directly enters described condenser, open the first control valve simultaneously, close the second control valve, described working medium in described liquid container is directly delivered in described high pressure pre-heater and described low pressure preheater (LPP by described working medium pump.
6. electricity-generating method according to claim 5, it is characterized in that: when described exhaust steam temperature is higher, the described working medium that described condenser flows out promotes to enter in described low pressure exhaust steam regenerator by described working medium pump and heats, then shunt, described working medium part directly enters described low pressure preheater (LPP, another part boosts to high pressure conditions through described working medium pump and enters in described high pressure exhaust steam regenerator again and heat, and enters described high pressure pre-heater.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT201900006589A1 (en) * | 2019-05-07 | 2020-11-07 | Turboden Spa | OPTIMIZED ORGANIC CASCADE RANKINE CYCLE |
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| CN105443174A (en) * | 2016-01-07 | 2016-03-30 | 上海维尔泰克螺杆机械有限公司 | Cascade type organic Rankine cycle system |
| CN105649697A (en) * | 2016-01-07 | 2016-06-08 | 上海维尔泰克螺杆机械有限公司 | Cascade type organic Rankine cycle system |
| CN105626175B (en) * | 2016-03-15 | 2017-08-11 | 山东科灵节能装备股份有限公司 | Organic rankine cycle power generation system |
| CN109854314A (en) * | 2019-04-04 | 2019-06-07 | 国电宿州第二热电有限公司 | A kind of power generator and method recycling power plant's cold source heat |
| CN110388241B (en) * | 2019-07-31 | 2021-07-20 | 东北师范大学 | Waste heat recovery thermal circulation system of automobile engine |
| CN111075521B (en) * | 2019-12-18 | 2022-09-20 | 北京石油化工学院 | High-low pressure double working medium ORC power generation system with regenerative cycle |
| CN112160808B (en) * | 2020-09-23 | 2021-12-21 | 昆明理工大学 | Waste heat recovery power-cooling combined supply system of ship gas turbine |
| CN113187572A (en) * | 2021-06-03 | 2021-07-30 | 上海海事大学 | Marine multi-evaporator organic Rankine cycle system |
| CN114263512A (en) * | 2021-12-27 | 2022-04-01 | 中国重汽集团济南动力有限公司 | Vehicle-mounted engine waste heat recovery single-pressure organic Rankine cycle system |
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| JPS61132710A (en) * | 1984-11-30 | 1986-06-20 | Toshiba Corp | Dual rankine cycle |
| JPH04298604A (en) * | 1990-11-20 | 1992-10-22 | General Electric Co <Ge> | Combined cycle power plant and steam supply method |
| JP3753762B2 (en) * | 1995-09-21 | 2006-03-08 | バブコック日立株式会社 | Waste heat recovery boiler |
| JP4478674B2 (en) * | 2006-12-26 | 2010-06-09 | カワサキプラントシステムズ株式会社 | Cement firing plant waste heat power generation system |
| US8561405B2 (en) * | 2007-06-29 | 2013-10-22 | General Electric Company | System and method for recovering waste heat |
| JP2009221961A (en) * | 2008-03-17 | 2009-10-01 | Fuji Electric Holdings Co Ltd | Binary power generating system |
| CN101806232A (en) * | 2010-03-17 | 2010-08-18 | 昆明理工大学 | Multistage evaporation organic Rankine cycle waste heat recovery generation system and method thereof |
| US8667799B2 (en) * | 2011-07-25 | 2014-03-11 | Ormat Technologies Inc. | Cascaded power plant using low and medium temperature source fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| IT201900006589A1 (en) * | 2019-05-07 | 2020-11-07 | Turboden Spa | OPTIMIZED ORGANIC CASCADE RANKINE CYCLE |
| WO2020225660A3 (en) * | 2019-05-07 | 2020-12-17 | Turboden S.p.A. | Optimized cascade organic rankine cycle |
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