CN101705849A - Self-coupling cold source heat pump circulating device of low-temperature exhaust heat power generating system in low temperature exhaust steam condensation process - Google Patents
Self-coupling cold source heat pump circulating device of low-temperature exhaust heat power generating system in low temperature exhaust steam condensation process Download PDFInfo
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Abstract
The invention relates to the technical field of low-temperature exhaust heat power generation at low temperature, in particular to a self-coupling cold source heat pump circulating device of a low-temperature exhaust heat power generating system in the low temperature exhaust steam condensation process. The self-coupling cold source heat pump circulating device comprises a conventional low-temperature exhaust heat power generating heat circulation system, a heat pump type condenser which is arranged parallel with a water-cooled condenser is arranged at an exhaust steam outlet of a lower pressure cylinder of a steam turbine; a gaseous state working medium outlet of the heat pump type condenser is divided into three paths which respectively pass through a heat pump system compressor, wherein a first path passes through a heat pump condensed water heater, a second path passes through a heat pump deoxidized heater and a third path passes through a heat pump water feeding heater and then returns to a liquid state working medium input of the heat pump type condenser; the heat pump water feeding heater is arranged between a condensing water pump and a deaerator; the heat pump deoxidized heater is arranged on the deaerator; and the heat pump water feeding heater is arranged at a water feeding inlet of a water feeding pump and an exhaust heat boiler. The invention substantially improves the exhaust heat utilization efficiency of the low-temperature exhaust heat power generating system and enables the system to produce more power energy under the condition that exhaust heat sources are the same.
Description
Technical field:
The present invention relates to improve the device of low-temperature cogeneration efficiency of thermal cycle, particularly a kind of is that the low-temperature cogeneration system exhaust steam condensation process of purpose is from lotus root cold source heat pump circulation means to reduce cold source energy, to improve efficiency of thermal cycle.
Background technique:
At present, what known low-temperature cogeneration thermodynamic cycle device adopted is the Rankine cycle mode, and its process prescription is: working medium absorbs flue gas low-temperature waste heat level pressure and heats up in exhaust heat boiler, form two kinds of steam with different acting abilities of low pressure and high pressure; The main steam ports that high pressure steam enters steam turbine carries out deciding the entropy acting, and the heat energy that steam is entrained changes the mechanical energy of steam turbine rotor into; Low pressure steam enters steam turbine as filling by filling mouth, mixes the back with the main vapour of relevant position and continues acting, after the mixed vapour acting finishes, leaves turbine low pressure cylinder and goes out the interruption-forming exhaust steam; The mechanical energy of turbine rotor is changed into electric energy with the coaxial generator of steam turbine, flows to electrical distribution system; Exhaust steam is cooled in vapour condenser and forms condensed water after the latent heat of vaporization is emitted in water cooling, and cooling water enters cooling tower, and this partial heat energy is discharged in the environment after absorbing the latent heat of vaporization of exhaust steam under the effect of circulating water pump; Water of condensation is delivered to oxygen-eliminating device by condensate pump, carries out deoxygenation with moisturizing in oxygen-eliminating device; Oxygen-removing water reenters exhaust heat boiler and absorbs the flue gas low-temperature waste heat after the feed water pump pressurization, carry out next cogeneration thermodynamic cycle.
In sum, the condensation process of exhaust steam is finished in vapour condenser, and exhaust steam is condensed and emitted a large amount of latent heats of vaporization, and this part heat water that is cooled absorbs, and is discharged in the ambient air in cooling tower.Because what present known low-temperature cogeneration system adopted is the Rankine cycle mode, according to the engineering thermodynamics basic principle, the waste heat source is the thermal source in the circulating system, and ambient air is the low-temperature receiver in the circulating system.Therefore, the exhaust steam latent heat of vaporization of emitting of condensing is discharged in the ambient air by cooling water, has formed the cold source energy in the Rankine cycle.
As everyone knows, the generate electricity purpose of thermodynamic cycle of working medium is waste heat will be transformed into electric energy, known low-temperature cogeneration system greatest problem is that efficiency of thermal cycle is very low, generally between 22%-25%, the invalid loss of thermodynamic cycle process is up to 75%-78%, wherein be discharged into cold source energy in the ambient air up to 55%-65% by recirculated cooling water, this shows, cold source energy in the thermodynamic cycle is the maximum restraining factors that cause the Lang Ken cycle efficiency low, reduces cold source energy in the thermodynamic cycle and be the effective way of the efficiency of thermal cycle that improves the low-temperature cogeneration system.
Summary of the invention:
The present invention is intended to solve the defective of prior art, and a kind of low-temperature cogeneration system cold source energy, raising low-temperature cogeneration system efficiency of thermal cycle of can reducing is provided, working medium self (condensed water and feedwater) is coupled as the low-temperature cogeneration system exhaust steam condensation process of low-temperature receiver from lotus root cold source heat pump circulation means.
The technological scheme that the present invention addresses the above problem employing is: a kind of low-temperature cogeneration system exhaust steam condensation process is from lotus root cold source heat pump circulation means, comprise the exhaust heat boiler that constitutes conventional low-temperature cogeneration circulation system, steam turbine, generator, the water-cooled vapour condenser, circulating water pump, cooling tower, condensate pump, small pump, oxygen-eliminating device, feed water pump, the heat pump type vapour condenser that is set up in parallel with the water-cooled vapour condenser is equipped with in described turbine low pressure cylinder exhaust steam outlet port, the gaseous working medium delivery outlet of this heat pump type vapour condenser is divided into three the tunnel, respectively by behind the heat pump compressor, one the tunnel through heat pump water of condensation heater, two the tunnel through the heat pump deaerating heater, three the tunnel return the liquid refrigerant inlet opening of heat pump type vapour condenser through the heat pump feed water preheater, described heat pump water of condensation heater cartridge is between condensate pump and oxygen-eliminating device, described heat pump deaerating heater is loaded on the oxygen-eliminating device, and described heat pump feed water preheater is loaded on feed water pump and exhaust heat boiler feed-water intake place.
Technique scheme is the improvement to the thermodynamic cycle of low-temperature cogeneration system, relates to two aspects, is the improvement of exhaust steam condensation process on the one hand, is the mode of utilizing of the weary airsetting knot latent heat of vaporization of emitting on the other hand.The exhaust steam separated into two parts that the present invention will do work in steam turbine and finish: a part of exhaust steam enters the heat pump type vapour condenser, it is the vaporizer of the heat pump of thermal source that the heat pump type vapour condenser is actually with the exhaust steam, in the heat pump type vapour condenser, the exhaust steam latent heat of vaporization of emitting of condensing is absorbed by heat pump fluid, heat absorption back heat pump fluid enters heat pump water of condensation heater by heat pump circulating system, heat pump deaerating heater and heat pump feed water preheater, at heat pump water of condensation heater, in heat pump deaerating heater and the heat pump feed water preheater, heat pump fluid absorbs the latent heat of vaporization with institute and discharges respectively to water of condensation, treat oxygen-removing water, boiler feed water, thereby the latent heat of vaporization of part exhaust steam in the thermodynamic cycle of low-temperature cogeneration system is carried out effective recycling, reach the purpose that improves efficiency of thermal cycle.Because water of condensation, boiler feed water preheating and feedwater deaeration can't reclaim the latent heat of vaporization of whole exhaust steam with hot quantity, remaining exhaust steam enters in the conventional water-cooled vapour condenser and finishes condensation process, the exhaust steam condensation process of the type of cooling of this part exhaust steam and the thermodynamic cycle of known low-temperature cogeneration system is in full accord, the latent heat of vaporization that the weary airsetting knot of this part is emitted is discharged into the atmosphere in cooling tower by cooling water, and this part heat forms the cold source energy that improves the thermodynamic cycle of back low-temperature cogeneration system.
Compared with prior art, technical advantage of the present invention is: the one, power generation cycle working medium itself (feedwater, water of condensation, moisturizing) is coupled into low-temperature receiver, the exhaust steam part latent heat of vaporization of emitting of condensing is shifted out by heat pump circulating system, be used for heating condensate water, moisturizing, feedwater deaeration and feed-water preheating, thereby reduced the heat of discharging into the atmosphere by cooling tower, promptly reduce cold source energy, improved the thermodynamic cycle thermal efficiency.The 2nd, different with known low-temperature cogeneration system's circulation system deoxygenation technology, replace low-pressure steam as the deoxygenation thermal source with the exhaust steam latent heat of vaporization, not only reduced cold source energy, and cancelled deoxygenation vapour, the filling amount that enters steam turbine is increased, can under the constant condition of waste heat source condition, improve the electric motor power of power generation system, improve the Economy of power generation system.The 3rd, because cold source energy reduces, the corresponding minimizing of quantity of circulating water is so cooling system circulation pump power consumption reduces.The 4th, can utilize heat pump techniques to reduce the exhaust steam adiabatic condensation temperature, thereby reduce turbine back pressure, efficiency of thermal cycle is improved.The application of the technology of the present invention measure, the cycle efficiency that can make the low-temperature cogeneration system still improves about 5%-8% behind lotus root low-temperature receiver heating system private power consumption in deduction exhaust steam condensation, raising by a relatively large margin the efficiency of thermal cycle of afterheat generating system.Simultaneously, the present invention also provides new thinking for reducing thermal power generation thermodynamic cycle cold source energy.
Description of drawings:
Fig. 1 is a structural representation of the present invention.
Among the figure: 1 is exhaust heat boiler; 2 is steam turbine; 3 is generator; 4 is the heat pump type vapour condenser; 5 is the water-cooled vapour condenser; 6 is circulating water pump; 7 is cooling tower; 8 is condensate pump; 9 is small pump; 10 is the heat pump compressor; 11 is heat pump water of condensation heater; 12 is oxygen-eliminating device; 13 is the heat pump deaerating heater; 14 is feed water pump; 15 is the heat pump feed water preheater.
Embodiment:
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
A kind of low-temperature cogeneration system exhaust steam condensation process is from lotus root cold source heat pump circulation means, as shown in Figure 1, compare with known low-temperature cogeneration circulation system, specialization of the present invention has adopted the exhaust steam condensation process from the lotus root cold source heat pump circulatory system exhaust steam latent heat of vaporization of emitting of condensing to be recycled. among the figure, exhaust heat boiler 1, steam turbine 2, generator 3, water-cooled vapour condenser 5, circulating water pump 6, cooling tower 7, condensate pump 8, small pump 9, oxygen-eliminating device 12, feed water pump 14 constitutes known low-temperature cogeneration circulation system, and heat pump type vapour condenser 4, heat pump compressor 10, heat pump water of condensation heater 11, heat pump deaerating heater 13, heat pump feed water preheater 15 constitutes the exhaust steam condensation process from lotus root cold source heat pump circulation means.
Heat pump type vapour condenser 4 is installed in steam turbine 2 low pressure (LP) cylinder exhaust steam outlet ports side by side with water-cooled vapour condenser 5, the gaseous working medium delivery outlet of this heat pump type vapour condenser 4 is divided into three the tunnel, respectively by behind the heat pump compressor 10, one the tunnel through heat pump water of condensation heater 11, two the tunnel through heat pump deaerating heater 13, three the tunnel return the liquid refrigerant inlet opening of heat pump type vapour condenser 4 through heat pump feed water preheater 15, heat pump water of condensation heater 11 is loaded between condensate pump 8 and the oxygen-eliminating device 12, heat pump deaerating heater 13 is loaded on the oxygen-eliminating device 12, and heat pump feed water preheater 15 is loaded on the feed-water intake place of feed water pump 14 and exhaust heat boiler 1.
The working principle of this device is as follows:
After doing work and finish, steam forms exhaust steam in steam turbine 2, the part exhaust steam enters in the heat pump type vapour condenser 4 condenses, the exhaust steam latent heat of vaporization of emitting of condensing passes to the working medium of exhaust steam condensation process from the lotus root cold source heat pump circulatory system by the heat exchanger in the heat pump type vapour condenser 4, make it become gaseous state by liquid state, the effect of heat exchanger is identical with the vaporizer effect of heat pump usually in the described heat pump type vapour condenser 4, structure also with usually known to heat pump in evaporation structure basic identical.The exhaust steam condensation process is from the working medium of the lotus root cold source heat pump circulatory system is absorbed heat evaporation in described heat pump type vapour condenser 4 after, by described heat pump compressor 10 pressurizations, and enter respectively in heat pump water of condensation heater 11, heat pump deaerating heater 13 and the heat pump feed water preheater 15, condensation heat in above-mentioned three parts, in heat pump water of condensation heater 11, the water of condensation that the exhaust steam condensation process is condensed heat transferred to form by exhaust steam from lotus root cold source heat pump circulatory system working medium is preheated to water of condensation about 80 ℃ by 42.5 ℃; In heat pump deaerating heater 13, the exhaust steam condensation process is treated oxygen-removing water from lotus root cold source heat pump circulatory system working medium with heat transferred from lotus root low-temperature receiver exhaust steam condensation process, will treat that oxygen-removing water is heated to 104 ℃ by 80 ℃ and carries out thermal de-aeration; In heat pump feed water preheater 15, the exhaust steam condensation process with the boiler feed water of heat transferred after described feed water pump 14 pressurizations, will treat that boiler feed water is heated to about 140 ℃ by 104 ℃ from lotus root cold source heat pump circulatory system working medium.The structure of described heat pump water of condensation heater 11, described heat pump deaerating heater 13, described heat pump feed water preheater 15 is identical with the condenser structure of heat pump usually.
The present invention compares maximum difference with known low-temperature cogeneration system and is: the present invention is coupled into low-temperature receiver with working medium self (condensed water and feedwater) by heat pump techniques, make the low-temperature cogeneration circulatory system have two low-temperature receivers, i.e. ambient air and working medium self.By this brand-new circulation technology and device, the part latent heat of vaporization of original power generation system can be transferred to power generation cycle working medium, be used for heating condensate water, feedwater deaeration and feed-water preheating, thereby reduce the cold source energy that is discharged in the atmosphere environment, finally improve the efficiency of thermal cycle of low-temperature cogeneration system.
Advantage of the present invention is by reducing cold source energy, not only having improved the thermal efficiency of low-temperature cogeneration system thermodynamic cycle, and increased the quantity of steam that enters steam turbine, the installed capacity that has improved electricity generation system under the identical condition in waste heat source. Along with the minimizing of cold source energy, the circulating cooling water yield reduces, and has reduced water circulating pump power consumption simultaneously.
Claims (1)
1. a low-temperature cogeneration system exhaust steam condensation process is from lotus root cold source heat pump circulation means, comprise the exhaust heat boiler that constitutes conventional low-temperature cogeneration circulation system, steam turbine, generator, the water-cooled vapour condenser, circulating water pump, cooling tower, condensate pump, small pump, oxygen-eliminating device, feed water pump, it is characterized in that, the heat pump type vapour condenser that is set up in parallel with the water-cooled vapour condenser is equipped with in described turbine low pressure cylinder exhaust steam outlet port, the gaseous working medium delivery outlet of this heat pump type vapour condenser is divided into three the tunnel, respectively by behind the heat pump compressor, one the tunnel through heat pump water of condensation heater, two the tunnel through the heat pump deaerating heater, three the tunnel return the liquid refrigerant inlet opening of heat pump type vapour condenser through the heat pump feed water preheater, described heat pump water of condensation heater cartridge is between condensate pump and oxygen-eliminating device, described heat pump deaerating heater is loaded on the oxygen-eliminating device, and described heat pump feed water preheater is loaded on feed water pump and exhaust heat boiler feed-water intake place.
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| CN102022144A (en) * | 2010-11-12 | 2011-04-20 | 华北电力大学（保定） | Thermal power generation system with function of exhaust steam recovery |
| CN103629812A (en) * | 2013-11-14 | 2014-03-12 | 颍上县经纬循环农业有限公司 | Air heating device of flourmill |
| CN103743287A (en) * | 2013-11-26 | 2014-04-23 | 中国电力工程顾问集团中南电力设计院 | High-level water collection cooling water circulation system with rear-mounted water pump and circulation method |
| CN103776192A (en) * | 2014-02-24 | 2014-05-07 | 梁兆福 | Low-temperature waste heat power generation device |
| CN108825320A (en) * | 2018-09-11 | 2018-11-16 | 翁志远 | A kind of cryogenic fluid electricity generation system and dynamical system |
| CN109595046A (en) * | 2018-11-23 | 2019-04-09 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Large-sized Coal-fired Power group boiler afterheat couples full recycling electricity generation system with turbine exhaust heat |
| CN110878710A (en) * | 2019-06-14 | 2020-03-13 | 张国安 | Novel thermal power plant exhaust steam waste heat regeneration power generation system and implementation method thereof |
| CN111485963A (en) * | 2019-01-28 | 2020-08-04 | 宋惠军 | Energy-saving efficient low-emission steam turbine power generation device |
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| KR100821960B1 (en) * | 2007-02-02 | 2008-04-16 | 주식회사 케너텍 | Local heating system for energy saving in cogeneration |
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| CN102022144A (en) * | 2010-11-12 | 2011-04-20 | 华北电力大学（保定） | Thermal power generation system with function of exhaust steam recovery |
| CN102022144B (en) * | 2010-11-12 | 2013-10-16 | 华北电力大学（保定） | Thermal power generation system with function of exhaust steam recovery |
| CN103629812A (en) * | 2013-11-14 | 2014-03-12 | 颍上县经纬循环农业有限公司 | Air heating device of flourmill |
| CN103743287A (en) * | 2013-11-26 | 2014-04-23 | 中国电力工程顾问集团中南电力设计院 | High-level water collection cooling water circulation system with rear-mounted water pump and circulation method |
| CN103743287B (en) * | 2013-11-26 | 2016-07-20 | 中国电力工程顾问集团中南电力设计院有限公司 | The rearmounted high position of water pump receives water cooling water recirculation system and round-robin method |
| CN103776192A (en) * | 2014-02-24 | 2014-05-07 | 梁兆福 | Low-temperature waste heat power generation device |
| CN108825320A (en) * | 2018-09-11 | 2018-11-16 | 翁志远 | A kind of cryogenic fluid electricity generation system and dynamical system |
| CN109595046A (en) * | 2018-11-23 | 2019-04-09 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Large-sized Coal-fired Power group boiler afterheat couples full recycling electricity generation system with turbine exhaust heat |
| CN109595046B (en) * | 2018-11-23 | 2024-03-19 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Large-scale coal-fired unit boiler waste heat and steam turbine waste heat coupling full recovery power generation system |
| CN111485963A (en) * | 2019-01-28 | 2020-08-04 | 宋惠军 | Energy-saving efficient low-emission steam turbine power generation device |
| CN110878710A (en) * | 2019-06-14 | 2020-03-13 | 张国安 | Novel thermal power plant exhaust steam waste heat regeneration power generation system and implementation method thereof |
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