CN103670556A - Double-working-medium circulation waste heat power generating system - Google Patents
Double-working-medium circulation waste heat power generating system Download PDFInfo
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- CN103670556A CN103670556A CN201310626226.8A CN201310626226A CN103670556A CN 103670556 A CN103670556 A CN 103670556A CN 201310626226 A CN201310626226 A CN 201310626226A CN 103670556 A CN103670556 A CN 103670556A
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Abstract
The invention discloses a double-working-medium circulation waste heat power generating system which comprises a steam turbine and a low-boiling-point working medium turbine. The steam turbine drives a power generator. The low-boiling-point working medium turbine is coaxially connected with the steam turbine. The steam turbine is driven by the steam generated by a waste heat boiler. When the steam generated by the waste heat boiler is conveyed to the steam turbine, the steam acts in an expansion manner, the discharged steam sequentially passes a working medium evaporator and a working medium heater for heat exchange through pipelines, the steam emits heat and is condensed into liquid, and the liquid returns to the waste heat boiler through a water pump and is heated into steam. The low-boiling-point working medium turbine is driven by working medium gas, the working medium liquid sequentially passes the working medium heater and the working medium evaporator, absorbs heat and evaporates to form working medium gas, the working medium gas enters the low-boiling-point working medium turbine and acts in an expansion manner, and the discharged working medium gas after action emits heat through a heat returning device. By the reasonable design of double-working-medium circulation and multiple heat exchanging treatments, the steam discharge waste heat generated during steal circulation can be fully used as the heat source of a low-boiling-point working medium circulation, and waste heat utilization rate can be increased greatly.
Description
Technical field
The invention belongs to waste heat and be beneficial to technical field, relate to a kind of double-work medium cycle waste heat generating system.
Background technique
In industrial process, for the waste heat that effectively utilizes flue gas or other sources of the gas is with energy saving, conventional UTILIZATION OF VESIDUAL HEAT IN is that steam enters turbine expansion acting and promotes vane rotary by single exhaust heat boiler heating water generates steam, thereby drives generator generating.Conventional vapor recycle only has the heat energy of 30% left and right to change electric energy into, and wherein 70% heat is taken away by the recirculated cooling water of vapour condenser in steam condensation, and UTILIZATION OF VESIDUAL HEAT IN efficiency is not high.
Summary of the invention
The problem that the present invention solves is to provide a kind of double-work medium cycle waste heat generating system, and the circulation that comprises water circulation and two kinds of working medium of low boiling working fluid circulation, can increase substantially utilization rate of waste heat.
The present invention is achieved through the following technical solutions:
A double-work medium cycle waste heat generating system, comprises the steam turbine that drives generator, and with the coaxial low boiling working fluid turbine being connected of steam turbine;
The steam driven that steam turbine is produced by exhaust heat boiler, the steam producing at exhaust heat boiler is delivered to after turbine expansion acting, steam discharge carries out heat exchange by flow through successively working medium vaporizer and working medium heater of pipeline, and heat release condenses into liquid, returns exhaust heat boiler be heated to form steam through water pump;
Low boiling working fluid turbine is driven by Working medium gas, worker quality liquid flow through successively working medium heater and working medium vaporizer, heat absorption flashes to Working medium gas, enter the acting of low boiling working fluid turbine expansion, Working medium gas exhaust after acting is by regenerator heat release, enter condenser and be condensed into worker quality liquid, after working medium pump pressurization, by regenerator, absorb heat again, get back to working medium heater.
Described steam turbine, the common generator driving of low boiling working fluid turbine replace with pump or fan.
Described exhaust heat boiler is the exhaust heat boiler with afterburning system, comprise economizer, water tank, vaporizer, afterburning burner and the first drum, the water (flow) direction of passing through and waste heat flue gas pass through opposite direction, the steam water interface producing through vaporizer enters after the first drum, steam enters steam turbine acting, and water is got back to water tank through recycle pump.
Described water tank also separates hot water and through piping, working medium vaporizer is heated worker quality liquid, and the water that working medium vaporizer is discharged enters working medium heater preheating worker quality liquid, and the water that working medium heater is discharged is got back to water tank through water pump, economizer again.
Described water tank is connected with working medium vaporizer by pipeline, and pipeline is provided with adjustment doors and controls the flow that enters hot water in working medium vaporizer.
Described exhaust heat boiler is when heating, and waste heat gas is mixed into exhaust heat boiler mutually with the high-temperature flue gas from afterburning burner, and flow through successively vaporizer and economizer carry out heat release, after its temperature reduces, discharges.
The water circulation of the steam of described driving steam turbine is:
Water enters water tank after water pump after economizer is preheated, water section in water tank enters vaporizer generation steam water interface and enters the first drum, after carbonated drink separation, water is got back to water tank through recycle pump, steam enters turbine expansion acting, steam discharge enters working medium vaporizer and carries out heat exchange, after the heat release of heating working medium liquid, become water, simultaneously from the part water of water tank, entering working medium vaporizer after adjustment doors also heats worker quality liquid, the water that working medium vaporizer is discharged enters working medium heater preheating worker quality liquid, the water that working medium heater is discharged is got back to economizer through water pump again,
Drive the working medium circulation of low boiling working fluid turbine to be:
Worker quality liquid pressurizes through working medium pump, by regenerator, absorb heat, enter again after the preheating of working medium heater, entering working medium vaporizer becomes gaseous state and enters the second drum, Working medium gas from the second drum enters the acting of low boiling working fluid turbine expansion, turbine exhaust, by regenerator heat release, enters vapour condenser and is condensed into worker quality liquid, by working medium pump, enters into regenerator.
Described when turbine exhaust enters regenerator, by regenerator, carry out heat exchange, the worker quality liquid that heating enters by working medium pump.
Described worker quality liquid is low boiling working fluid, and under normal pressure, its boiling point is-27.07 ℃～14.9 ℃.
Compared with prior art, the present invention has following useful technique effect:
Double-work medium cycle waste heat generating system provided by the invention, adopt the double-work medium of steam and low boiling working fluid to carry out power generation system, by double-work medium being looped to rational design, by heat exchange repeatedly, process, thermal source using the exhausted spare heat producing in vapor recycle process as low boiling working fluid cyclic process utilizes fully, can increase substantially UTILIZATION OF VESIDUAL HEAT IN efficiency.
Double-work medium cycle waste heat generating system provided by the invention, the cyclic design of its two kinds of working medium is ingenious, can realize repeatedly heat exchange:
Described water cycle process is: after water is pressurized in water pump, the economizer that enters exhaust heat boiler is heated by flue gas or other source of the gas, then enter water tank, the water of part water tank enters in vaporizer and is entered drum after high-temperature flue gas or the heating of other source of the gas, part water becomes steam and enters expansion acting in steam turbine, drives generator generating or other equipment to rotate.The water that does not become steam is got back to water tank under the effect of recycle pump.Turbine discharge enters working medium vaporizer and part from the water heating low boiling working fluid of water tank, steam heat release becomes liquid water, water is preheating low boiling working fluid in working medium heater, the temperature of water continues to reduce, then the water pump of flowing through, enters exhaust heat boiler, in economizer by low-temperature flue gas or other source of the gas preheating, then enter water tank and vaporizer, thereby formed water circulation.
Because the turbine discharge in water cycle process still has certain heat, therefore steam discharge is introduced in the low boiling working fluid circulatory system and carried out secondary heat exchange utilization, improve efficiency of energy utilization.Turbine discharge by working medium vaporizer and working medium heater, condenses into liquid state successively after heat release, through water pump pressurization, get back to again in exhaust heat boiler and continue to circulate; And the hot water in water tank heats cycle fluid simultaneously, guaranteed the gasification of cycle fluid.
Described low boiling working fluid cyclic process is: low boiling working fluid is after working medium pump adherence pressure, enter working medium heater by water preheat, then enter working medium vaporizer continuation heating and enter drum, low boiling working fluid gas from drum out, enter the acting of low boiling working fluid turbine expansion, drive generator generating or other equipment to rotate.Exhaust after acting is by regenerator heat release, becomes liquid after entering condenser, after working medium pump pressurization, absorbs heat by regenerator again, enters working medium heater and continues circulation, forms low boiling working fluid circulation.
Described regenerator can improve thermal efficiency of cycle: the exhaust of low boiling working fluid turbine is carried out heat exchange by regenerator, temperature is reduced, reduce in vapour condenser and be recycled the heat that cooling water is taken away, the worker quality liquid simultaneously condensing after pressurization absorbs heat by regenerator again, improve the temperature of worker quality liquid, reduce the caloric receptivity of worker quality liquid in vaporizer, improve thermal efficiency of cycle and heat-economy.
Double-work medium cycle waste heat generating system provided by the invention, can fully to waste heat, utilize: from the waste heat of the flue gas in industrial process or other source of the gas before entering exhaust heat boiler body, mix mutually with high-temperature flue gas or other source of the gas from afterburning burner, mixed flue gas or other other enter boiler body after, flow through successively vaporizer and economizer carries out heat release, its temperature reduces, finally by its discharge.
Accompanying drawing explanation
Fig. 1 is double-work medium cycle waste heat generating system schematic diagram of the present invention.
Wherein, 1. water pump, 2. economizer, 3. water tank, 4. vaporizer, 5. the first drum, 6. recycle pump, 7. steam turbine, 8. generator, 9. adjustment doors, 10. working medium vaporizer, 11. working medium heaters, 12. working medium pumps, 13. second drums, 14. low boiling working fluid turbines, 15. vapour condenser, 16. regenerators.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
Referring to Fig. 1, double-work medium cycle waste heat generating system provided by the invention, comprises the steam turbine 7 that drives generator 8, and with the coaxial low boiling working fluid turbine 14 being connected of steam turbine 7;
The steam driven that steam turbine 7 is produced by exhaust heat boiler, the steam producing at exhaust heat boiler is delivered to steam turbine 7 and expands after acting, steam discharge carries out heat exchange by flow through successively working medium vaporizer 10 and working medium heater 11 of pipeline, heat release condenses into liquid, returns exhaust heat boiler be heated to form steam through water pump 1;
Low boiling working fluid turbine 14 is driven by Working medium gas, worker quality liquid flow through successively working medium heater 11 and working medium vaporizer 10, heat absorption flashes to Working medium gas, enter the 14 expansion actings of low boiling working fluid turbine, Working medium gas exhaust after acting is by regenerator 16 heat releases, enter condenser 15 and be condensed into worker quality liquid, after working medium pump 12 pressurizations, by regenerator 16, absorb heat again, get back to working medium heater 11.
Described double-work medium is water and low boiling working fluid, described low boiling working fluid comprise: R245fa atmospheric boiling point is 14.9 ℃, and R134a atmospheric boiling point is-27.07 ℃.And the generator 8 of described steam turbine 7, the 14 common drivings of low boiling working fluid turbine can replace with other loads, such as pump or fan.
Concrete, water enters water tank 3 after water pump 1 after economizer 2 is by low-temperature flue gas or other gas preheating, then part water enters vaporizer 4 generation steam water interfaces and enters the first drum 5, water is got back to water tank 3 through recycle pump 6, steam enters steam turbine 7 expansion actings and drives generator 8 generatings, steam discharge becomes water after entering working medium vaporizer 10 heating low boiling working fluids, simultaneously from the part water of water tank 3, entering working medium vaporizer 10 after adjustment doors 9 also heats low boiling working fluid, the water that working medium vaporizer 10 is discharged enters working medium heater 11 preheating low boiling working fluids, then through water pump 1 pressurization, form complete water circulation.
Working medium gas from drum 13 enters 14 expansion acting drive generator 8 generatings of low boiling working fluid turbine, turbine exhaust is by regenerator 16 heat releases, enter vapour condenser 15 and be condensed into liquid state, through working medium pump 12 pressurizations, by regenerator 16, absorb heat again, enter after 11 preheatings of working medium heater, enter working medium vaporizer 10 and become gaseous state and enter the second drum 13, form complete low boiling working fluid circulation.
In water cycle process, after water is pressurized in water pump, the economizer that enters exhaust heat boiler is heated by flue gas or other source of the gas, then enter water tank, the water of part water tank enters in vaporizer and is entered drum after high-temperature flue gas or the heating of other source of the gas, part water becomes steam and enters expansion acting in steam turbine, drives generator generating or other equipment to rotate.The water that does not become steam is got back to water tank under the effect of recycle pump.Turbine discharge enters working medium vaporizer and part from the water heating low boiling working fluid of water tank, steam heat release becomes liquid water, water is preheating low boiling working fluid in working medium heater, the temperature of water continues to reduce, then the water pump of flowing through, enters exhaust heat boiler, in economizer by low-temperature flue gas or other source of the gas preheating, then enter water tank and vaporizer, thereby formed water circulation.
Because the turbine discharge in water cycle process still has certain heat, therefore steam discharge is introduced in the low boiling working fluid circulatory system and carried out secondary heat exchange utilization, improve efficiency of energy utilization.Turbine discharge by working medium vaporizer and working medium heater, condenses into liquid state successively after heat release, through water pump pressurization, get back to again in exhaust heat boiler and continue to circulate.
In low boiling working fluid cyclic process, low boiling working fluid is after working medium pump adherence pressure, enter working medium heater by water preheat, then enter working medium vaporizer continuation heating and enter drum, low boiling working fluid gas from drum out, enter the acting of low boiling working fluid turbine expansion, drive generator generating or other equipment to rotate.Exhaust after acting is by regenerator heat release, becomes liquid after entering condenser, after working medium pump pressurization, absorbs heat by regenerator again, enters working medium heater and continues circulation, forms low boiling working fluid circulation.
Described regenerator Main Function: the exhaust of low boiling working fluid turbine is carried out heat exchange by regenerator, temperature is reduced, reduce in vapour condenser and be recycled the heat that cooling water is taken away, the worker quality liquid simultaneously condensing after pressurization absorbs heat by regenerator again, improve the temperature of worker quality liquid, reduce the caloric receptivity of worker quality liquid in vaporizer, improve thermal efficiency of cycle and heat-economy.
Claims (9)
1. a double-work medium cycle waste heat generating system, is characterized in that, comprises the steam turbine (7) that drives generator (8), and with the coaxial low boiling working fluid turbine (14) being connected of steam turbine (7);
The steam driven that steam turbine (7) is produced by exhaust heat boiler, the steam producing at exhaust heat boiler is delivered to steam turbine (7) and expands after acting, steam discharge carries out heat exchange by flow through successively working medium vaporizer (10) and working medium heater (11) of pipeline, heat release condenses into liquid, returns exhaust heat boiler be heated to form steam through water pump (1);
Low boiling working fluid turbine (14) is driven by Working medium gas, worker quality liquid flow through successively working medium heater (11) and working medium vaporizer (10), heat absorption flashes to Working medium gas, enter low boiling working fluid turbine (14) expansion acting, Working medium gas exhaust after acting is by regenerator (16) heat release, enter condenser (15) and be condensed into worker quality liquid, after working medium pump (12) pressurization, again by regenerator (16) heat absorption, get back to working medium heater (11).
2. double-work medium cycle waste heat generating system as claimed in claim 1, is characterized in that, described steam turbine (7), the common generator (8) driving of low boiling working fluid turbine (14) replace with pump or fan.
3. double-work medium cycle waste heat generating system as claimed in claim 1, it is characterized in that, described exhaust heat boiler is the exhaust heat boiler with afterburning system, comprise economizer (2), water tank (3), vaporizer (4), afterburning burner and the first drum (5), the water (flow) direction of passing through and waste heat flue gas pass through opposite direction, the steam water interface producing through vaporizer (4) enters after the first drum (5), steam enters steam turbine (7) acting, and water is got back to water tank (3) through recycle pump (6).
4. double-work medium cycle waste heat generating system as claimed in claim 3, it is characterized in that, described water tank (3) also separates hot water and through piping, working medium vaporizer (10) is heated worker quality liquid, the water that working medium vaporizer (10) is discharged enters working medium heater (11) preheating worker quality liquid, and the water that working medium heater (11) is discharged passes through water pump (1) again, economizer (2) is got back to water tank (3).
5. double-work medium cycle waste heat generating system as claimed in claim 4, it is characterized in that, described water tank (3) is connected with working medium vaporizer (10) by pipeline, and pipeline is provided with adjustment doors (9) and controls the flow that enters hot water in working medium vaporizer (10).
6. double-work medium cycle waste heat generating system as claimed in claim 3, it is characterized in that, described exhaust heat boiler is when heating, waste heat gas is mixed into exhaust heat boiler mutually with the high-temperature flue gas from afterburning burner, flow through successively vaporizer (4) and economizer (2) carries out heat release, after its temperature reduces, discharges.
7. as the double-work medium cycle waste heat generating system of claim 1-6 as described in any one, it is characterized in that, the water circulation of the steam of driving steam turbine (7) is:
Water enters water tank (3) after water pump (1) after economizer (2) is preheated, water section in water tank (3) enters vaporizer (4) generation steam water interface and enters the first drum (5), after carbonated drink separation, water is got back to water tank (3) through recycle pump (6), steam enters steam turbine (7) expansion acting, steam discharge enters working medium vaporizer (10) and carries out heat exchange, after the heat release of heating working medium liquid, become water, simultaneously from the part water of water tank (3), entering working medium vaporizer (10) after adjustment doors (9) also heats worker quality liquid, the water that working medium vaporizer (10) is discharged enters working medium heater (11) preheating worker quality liquid, the water that working medium heater (11) is discharged passes through water pump (1) again and gets back to economizer (2),
Drive the working medium circulation of low boiling working fluid turbine (14) to be:
Worker quality liquid pressurizes through working medium pump (12), by regenerator (16), absorb heat, enter again after working medium heater (11) preheating, entering working medium vaporizer (10) becomes gaseous state and enters the second drum (13), Working medium gas from the second drum (13) enters low boiling working fluid turbine (14) expansion acting, turbine exhaust, by regenerator (16) heat release, enters vapour condenser (15) and is condensed into worker quality liquid, by working medium pump (12), enters into regenerator (16).
8. double-work medium cycle waste heat generating system as claimed in claim 7, is characterized in that, when turbine exhaust enters regenerator (16), by regenerator (16), carries out heat exchange, the worker quality liquid that heating enters by working medium pump (12).
9. double-work medium cycle waste heat generating system as claimed in claim 7, is characterized in that, described worker quality liquid is low boiling working fluid, and under normal pressure, its boiling point is-27.07 ℃～14.9 ℃.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110469375A (en) * | 2019-08-16 | 2019-11-19 | 中信重工机械股份有限公司 | A kind of double discard heat generating systems of carbonated drink |
| CN110486989A (en) * | 2019-08-27 | 2019-11-22 | 安徽省智慧产业研究院股份有限公司 | A kind of novel biomass gasification furnace combined power and cooling system |
| WO2022156521A1 (en) * | 2021-01-19 | 2022-07-28 | 李华玉 | Dual-fuel combined cycle power plant |
| WO2022161113A1 (en) * | 2021-01-27 | 2022-08-04 | 李华玉 | Dual-fuel combined cycle power device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022161113A1 (en) * | 2021-01-27 | 2022-08-04 | 李华玉 | Dual-fuel combined cycle power device |
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