CN102242985A - Mixed working medium thermal circulating system and method for power and refrigeration cogeneration - Google Patents

Mixed working medium thermal circulating system and method for power and refrigeration cogeneration Download PDF

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CN102242985A
CN102242985A CN2010101754506A CN201010175450A CN102242985A CN 102242985 A CN102242985 A CN 102242985A CN 2010101754506 A CN2010101754506 A CN 2010101754506A CN 201010175450 A CN201010175450 A CN 201010175450A CN 102242985 A CN102242985 A CN 102242985A
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China
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solution
ammonia
heat exchanger
cold
steam
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CN2010101754506A
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CN102242985B (en
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金红光
韩巍
杨金福
孙流莉
崔平
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中国科学院工程热物理研究所
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/27Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62Absorption based systems
    • Y02B30/625Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00Climate change mitigation technologies for sector-wide applications
    • Y02P80/10Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

Abstract

The invention discloses a mixed working medium thermal circulating system and method for power and refrigeration cogeneration. In the system, an ammonia and water mixture is utilized as a working medium, and the middle/low temperature heat is utilized as a heat source. The method comprises the following steps: heating the ammonia water working medium to obtain superheated steam; introducing the superheated steam into a turbine to do work; introducing the exhaust steam of the turbine into a rectification tower to supply heat for the rectification process; introducing the ammonia generated by the rectification tower into an evaporator after condensing, undercooling and throttling; throttling a dilute solution subjected to waste heat recovery, introducing the throttled dilute solution into a absorber, mixing with the ammonia from the evaporator and condensing; and introducing a heat source into a steam generator firstly, and then introducing the heat source into a waste heat solution heat exchanger. The steam generator adopts the ammonia water strong solution as the working medium, the variable temperature evaporation feature of the ammonia water strong solution is well matched with the temperature of the heat source, thus the irreversible loss of the heat exchange process in the steam generator is reduced; simultaneously the exhaust steam of the turbine directly enters into the rectification tower to supply the rectifying heat without condensation, thus the irreversible loss caused by the variable temperature condensation of the ammonia water working medium is avoided; and the mixed type heat transfer is adopted, thus the irreversible loss of the heat exchange process is reduced.

Description

Cold alliance circulation system of mixed working fluid merit and method
Technical field
The present invention relates to energy technology field, particularly a kind of is the circulation system and the method for the cold alliance of mixed working fluid merit of working medium with the ammonia water mixture.
Background technology
China's industrial energy consumption accounts for 2/3rds of national total energy consumption, but efficiency of energy utilization is low, more than 50% with in low warm form discharging, the waste that this not only causes the energy also has thermal pollution to environment.Recycle these waste heats and have remarkable effect for improving China's efficiency of energy utilization.The circulatory system of the cold alliance of merit that ammonia absorption type refrigeration circulation, ammoniacal liquor power cycle and ammonia absorption type refrigeration combine with power cycle is exactly to utilize the typical circulation system of low-temperature heat source.
In the recycling process of centering low-temperature heat source, mainly comprise following several technology:
1, ammonia absorption type refrigeration circulation: the ammonia absorption type refrigeration circulation can utilize tow taste heat to freeze, low temperature exhaust heat drives the rectifying column operation, concentrated ammonia solution is made pure ammonia and dilute ammonia solution, pure ammonia is condensed into ammoniacal liquor in condenser, enter evaporimeter after the ammoniacal liquor process throttling step-down, sweat cooling, the ammonia after the evaporation is absorbed by the weak solution from the rectifying column still, be finally converted into concentrated solution, enter rectifying column and finish circulation.The subject matter that exists is, rectifying column reboiler endothermic temperature is lower, and the power waste heat supply temperature is higher, and the rectifying column irreversible loss is big, and system effectiveness is low.
2, water vapour Rankine cycle: with water is the Rankine cycle technology maturation of single working medium, but at evaporation stage, because the evaporation at constant temperature characteristic of water, it is bad that itself and thermal source are mated, and caused very big irreversible loss, and efficient is lower.
3, the Rankine cycle of zeotrope working medium: the employing zeotrope is the Rankine cycle of working medium (such as ammonia water mixture), utilize the alternating temperature evaporation characteristic of working medium, improve the temperature coupling of evaporation process working medium and thermal source, reduced the irreversible loss of this process greatly.But mixed working fluid is the alternating temperature condensation in condensation process, and this makes itself and low-temperature receiver (be generally cooling water, difference variation is little) temperature match condition variation, and irreversible loss is greater than the constant temperature condensation process of single working medium.
4, Ka Linna circulation: the Ka Linna that is proposed the eighties in 20th century by Ka Linna circulates, it is absorption power cycle, with the ammonia water mixture is working medium, replace conventional condenser with condensate fractionation unit (comprising regenerator, flash tank, low-pressure condenser, high pressure condenser etc.), reduced the irreversible loss of condensation process.Therefore native system had both reduced the irreversible loss of evaporation process by the alternating temperature evaporation, the irreversible loss of having avoided the alternating temperature condensation to be caused by the condensate fractionation unit again, i.e. evaporation, the condensation process improvement that all is improved.But the ammonia of the high concentration that flash tank comes out in this circulation has refrigerating capacity, and this point does not obtain utilizing at this, and therefore, this system awaits further to improve, so that make full use of acting, the refrigerating capacity of working medium.
5, absorption power refrigeration combined-circulation (Absorption Combined Power/CoolingCycle, APC): the APC that is proposed by the Zheng Dan magnitude circulates, on the basis of Ka Linna circulation, add a process of refrigerastion (having increased equipment such as condenser, choke valve, evaporimeter) to make full use of the refrigerating capacity of high strength ammonia, replace flash tank to increase the purity of ammonia with rectifying column simultaneously, make its refrigerating capacity bigger.System has increased cold output again on the basis of acting, increased the thermal efficiency, also makes system more flexible simultaneously.But still there is turbine exhaust temperature height in the APC circulation, loses big problem.
6, the just contrary coupling circulation system of the cross still state of the cold alliance of merit of series, parallel, series-parallel connection: by propositions such as Zhang Na, Liu Mengs, on bases such as Ka Linna circulation, APC circulation, by adjusting working medium concentration, improving mode such as internal system connection, whole efficiency is improved a lot.But still have following deficiency: the ammoniacal liquor concentrated solution enters the turbine acting in the train after pervaporation is overheated, and steam discharge condensation process and sink temperature coupling are bad, and big irreversible loss is arranged; Ammoniacal liquor weak solution precession power road in the parallel system, bad in the evaporation process with the thermal source coupling, big irreversible loss is arranged; Equipment is more in the combined hybrid system, and adjustment process is comparatively complicated, is not easy to operation.
Present mixed working fluid circulation is mostly based on generating, and refrigerating capacity is less relatively, turbine exhaust temperature height, and exhausted spare heat utilizes problem of difficult all not to be solved.
Summary of the invention
(1) technical problem that will solve
In order to overcome the shortcoming that existing middle-low temperature heat utilizes method, the present invention proposes the circulation system and the method for the cold alliance of a kind of mixed working fluid merit, to solve in the kind of refrigeration cycle in big, the single working medium power generation cycle of rectifying column reboiler heat transfer temperature difference problem such as the big and mixed working fluid power generation cycle turbine steam discharge condensation temperature height of working medium evaporation process heat transfer temperature difference.
(2) technical scheme
For achieving the above object, the present invention proposes the circulation system of the cold alliance of a kind of mixed working fluid merit, this system comprises separator (1), high-pressure solution pump (2), hypotonic solution pump (3), high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), steam generator (6), waste heat solution heat exchanger (7), turbine (8), rectifying column (9), condenser (10), subcooler (11), ammonia choke valve (12), evaporimeter (13), solution choke valve (14) and absorber (15), wherein absorber (15) is connected with separator (1), separator (1) is connected to high-pressure solution pump (2) and hypotonic solution pump (3), high-pressure solution pump (2) connects the high-pressure solution heat exchanger (4) on power road, is steam generator (6) and turbine (8) afterwards; Hypotonic solution pump (3) connects the hypotonic solution heat exchanger (5) and the waste heat solution heat exchanger (7) on the road of freezing successively; Turbine (8) directly links to each other with rectifying column (9) respectively with waste heat solution heat exchanger (7), the top of rectifying column (9) connects condenser (10), subcooler (11), ammonia choke valve (12) and evaporimeter (13) successively, and the bottom of rectifying column (9) connects high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), solution choke valve (14) and absorber (15) successively.
In the such scheme, described separator (1) is a part flow arrangement, and the quality shunting is carried out in the working medium logistics, and its inlet is connected with the hot side outlet of absorber (15), and outlet is connected with hypotonic solution pump (3) with high-pressure solution pump (2) respectively.
In the such scheme, described high-pressure solution pump (2) and hypotonic solution pump (3) are the liquid pressurized equipments, are used to improve fluid pressure; High-pressure solution pump (2) is connected between separator (1) and the high-pressure solution heat exchanger (4), and hypotonic solution pump (3) is connected between separator (1) and the hypotonic solution heat exchanger (5).
In the such scheme, described high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), steam generator (6) and waste heat solution heater (7) are heat transmission equipments, are used to realize the exchange heat between hot and cold logistics; Wherein: the hot side of high-pressure solution heat exchanger (4) is imported and exported and is connected with the hot side entrance of hypotonic solution heater (5) with rectifying column (9) taphole respectively, and cold side is imported and exported respectively and is connected with steam generator cold side inlet with high-pressure solution pump (2); The hot side outlet of hypotonic solution heat exchanger (5) is connected with absorber (15) solution inlet port, and the cold side import is connected with waste heat solution heat exchanger (7) with hypotonic solution pump (4) respectively in the cold side import and export; The hot side outlet of steam generator (6) is connected with the hot side-entrance of waste heat solution heat exchanger (7), and the cold side outlet is connected with turbine (8) inlet; The outlet of waste heat solution heat exchanger (7) cold side connects rectifying column (9), and the heat of steam generator (6) input is industrial exhaust heat or solar energy.
In the such scheme, described turbine (8) is an acting device, the HTHP ammonia vapor expands therein and realizes externally acting, and turbine (8) import and export are connected with rectifying column (9) with the outlet of steam generator (6) cold side respectively, and turbine (8) steam discharge directly enters rectifying column (9).
In the such scheme, described rectifying column (9) is used for that ammonia and water are carried out rectifying and separates, and its top is connected with a condenser (10), and the dense ammonia steam condensation that condenser (10) is used for the rectifying separation is obtained is as refrigeration working medium; Rectifying institute calorific requirement is from turbine (8) exhausted spare heat, and the dilute ammonia solution of output is connected in high-pressure solution heat exchanger (4) at the bottom of the tower.
In the such scheme, described subcooler (11) is a heat transmission equipment, and hot side is imported and exported and connected condenser (10) and choke valve (12) respectively, and cold side is imported and exported and connected evaporimeter (13) and absorber (15) respectively; Ammoniacal liquor from condenser (10) cools off in this cryogenic refrigeration working medium by evaporimeter (13) outlet.
In the such scheme, described ammonia choke valve (12) is the expansion dropping equipment, and ammoniacal liquor is realized step-down, cooling by throttling, and its import and export are connected with evaporimeter (13) with subcooler (11) respectively.
In the such scheme, described evaporimeter (13) is used for the evaporation of absorbing heat therein of refrigeration working medium solution, realizes cold output, and its import and export are connected with subcooler (11) with ammonia choke valve (12) respectively.
In the such scheme, described absorber (15) is made of blender and condenser, and the logistics of variable concentrations working medium mixes in blender earlier, and total condensation is liquid in condenser then; The hot side of absorber (15) comprises that cold side is a cooling water from the ammonia steam of subcooler (11) with from the weak solution of solution choke valve (14).
In the such scheme, described solution choke valve (14) connects hypotonic solution heat exchanger (5) and absorber (15).
In the such scheme, this system has an acting circulation and a kind of refrigeration cycle, the acting circulation is a working medium with the ammonia water mixture, to send into the acting of expanding in the steam turbine (8) at the hyperthermia and superheating ammonia vapor that steam generator (6) generates, rectifying column (9) and absorber (15) also are the composite devices of these two circulations for the tie point of acting circulation and kind of refrigeration cycle simultaneously.
For achieving the above object, the present invention also provides the thermal circulation method of the cold alliance of a kind of mixed working fluid merit, and this method becomes superheated steam with the ammonia-water mixture thermal conversion, enters turbine acting generating; The turbine steam discharge enters rectifying column, obtains dense ammonia steam and weak aqua ammonia, realizes cold output and generates dense ammonia steam as refrigeration working medium after the condensation of wherein dense ammonia steam, and weak aqua ammonia pressurization back is condensed into ammonia-water mixture with dense ammonia vapor mixing.
In the such scheme, this method specifically comprises: the concentrated solution S1 that absorber (15) comes out is split into two gangs of S2 and S7 through separator (1) earlier, S2 precession power road wherein, the cold road of S7 system, S2 is through high-pressure solution pump (2) pressurization back advanced high-pressure solution heat exchanger (4), with the weak solution S11 heat exchange from rectifying column (9), enters steam generator (6) evaporation then and enters turbine (8) after overheated and expand and do work, turbine (8) not condensation of steam discharge directly enters rectifying column (9); Another burst concentrated solution S7 passes through hypotonic solution heat exchanger (5) and waste heat solution heat exchanger (7) heating successively after hypotonic solution pump (3) pressurization, enter rectifying column (9) at last; In rectifying column (9),, in tower, be separated into tower still weak solution S11 and cat head ammonia steam S15 from the steam discharge S6 of turbine (8) and the mixed heat transfer that directly carries out contact from the concentrated solution S7 of waste heat solution heat exchanger (7); Tower still weak solution S11 successively flow through high-pressure solution heat exchanger (4) and hypotonic solution heat exchanger (5), after solution choke valve (14) throttling step-down, enter absorber (15) again, after cat head ammonia steam S15 enters condenser (10) and is condensed into liquefied ammonia S16, enter subcooler (11), after the low temperature ammonia steam S19 heat exchange that comes flash-pot (13), formation has the liquefied ammonia S17 of certain degree of supercooling, and S17 enters evaporimeter (13) sweat cooling again through choke valve (12) throttling step-down becoming low pressure liquefied ammonia S18; Become ammonia steam S20 behind the low temperature ammonia steam S19 process subcooler (11), enter absorber (15) at last, absorbed, form concentrated solution S1 again and enter next circulation by weak solution with certain degree of superheat.
(3) beneficial effect
From technique scheme as can be seen, the present invention has following beneficial effect:
1, the circulation system and the method for the cold alliance of this mixed working fluid merit provided by the invention, with in low-grade heat be thermal source, both can be industrial exhaust heat, also can be the regenerative resource of low temperature in the solar energy etc., to reach the purpose of energy-saving and emission-reduction.
2, the circulation system and the method for the cold alliance of this mixed working fluid merit provided by the invention, generating working medium adopts the ammoniacal liquor concentrated solution, and evaporation stage can be mated better with heat source temperature, reduces irreversible loss; The turbine steam discharge is without condensation, but directly advances at the bottom of the rectifying Tata, cancelled the tower still of traditional rectifying column, provides rectifying institute calorific requirement on the one hand, on the other hand also as the part charging of rectifying column, reduced the irreversible loss that the condensation of turbine steam discharge alternating temperature is caused.
3, the circulation system and the method for the cold alliance of this mixed working fluid merit provided by the invention utilize system integration principle to realize the cascade utilization of heat energy, have improved energy and have utilized level.It is also overheated with the ammoniacal liquor heating evaporation that middle low-temperature heat quantity is introduced in the steam generator, enters the waste heat solution heat exchanger again, and heating is as the concentrated solution of rectifying column charging, and through cascade utilization, exhaust gas temperature has obtained remarkable reduction.Weak solution elder generation process high-pressure solution heat exchanger preheating concentrated solution before steam generator from rectifying Tata still enters the hypotonic solution heat exchanger again, and preheating enters the concentrated solution of rectifying column, and the exhaust heat stepped utilization of internal system is raised the efficiency.
4, the circulation system and the method for the cold alliance of this mixed working fluid merit provided by the invention, flow process is simple, and each monotechnics is comparatively ripe, is convenient to industrialized utilization.
Description of drawings
Fig. 1 is the schematic diagram of the circulation system of the cold alliance of mixed working fluid merit provided by the invention.
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
The flow process of embodiment as shown in Figure 1.Wherein G1 to G3 represents the heat-carrying agent of thermal source, and W1 to W4 represents cooling water, and S1 to S20 represents cycle fluid.G1 adopts 400 ℃ of flue gases herein, and basic working medium S1 is that mass fraction is 34% ammonia water mixture.Capital equipment comprises separator (1), high-pressure solution pump (2), hypotonic solution pump (3), high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), steam generator (6), waste heat solution heat exchanger (7), turbine (8), rectifying column (9), condenser (10), subcooler (11), ammonia choke valve (12), evaporimeter (13), solution choke valve (14), absorber (15).Wherein absorber (15) links to each other with separator (1), separator (1) is connected to high-pressure solution pump (2) and hypotonic solution pump (3), high-pressure solution pump (2) connects the high-pressure solution heat exchanger (4) on power road, is steam generator (6) and turbine (8) afterwards; Hypotonic solution pump (3) connects the hypotonic solution heat exchanger (5) and the waste heat solution heat exchanger (7) on the road of freezing successively.Turbine (8) directly links to each other with rectifying column (9) with waste heat solution heat exchanger (7), the top of rectifying column (9) connects condenser (10), subcooler (11), ammonia choke valve (12) and evaporimeter (13) successively, and the bottom of rectifying column (9) connects high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), solution choke valve (14) and absorber (15) successively.Be that absorber and rectifying column are the shared device unit on power road and refrigeration road.
Idiographic flow is: concentrated solution S1 that absorber (15) comes out is split into two gangs of S2 and S7 through separator (1) earlier, S2 precession power road wherein, the cold road of S7 system.S2 is advanced high-pressure solution heat exchanger (4) after high-pressure solution pump (2) pressurization, with weak solution S11 heat exchange from rectifying column (9), enter steam generator (6) evaporation then and enter turbine (8) acting of expanding after overheated, turbine (8) not condensation of steam discharge directly enters rectifying column (9).Another burst concentrated solution S7 passes through hypotonic solution heat exchanger (5) and waste heat solution heat exchanger (7) heating successively after hypotonic solution pump (3) pressurization, enter rectifying column (9) at last.In rectifying column (9), from the steam discharge S6 of turbine (8) with identical from the concentrated solution S7 composition of waste heat solution heat exchanger (7), be the state difference, the mixed heat transfer that can carry out direct contact type is separated into tower still weak solution S11 and cat head ammonia steam S15 in tower.Tower still weak solution S11 successively flow through high-pressure solution heat exchanger (4) and hypotonic solution heat exchanger (5), after solution choke valve (14) throttling step-down, enter absorber (15) again, after cat head ammonia steam S15 enters condenser (10) and is condensed into liquefied ammonia S16, enter subcooler (11), after the low temperature ammonia steam S19 heat exchange that comes flash-pot (13), formation has the liquefied ammonia S17 of certain degree of supercooling, and S17 enters evaporimeter (13) sweat cooling again through choke valve (12) throttling step-down becoming low pressure liquefied ammonia S18.Become ammonia steam S20 behind the low temperature ammonia steam S19 process subcooler (11), enter absorber (15) at last, absorbed, form concentrated solution S1 again and enter next circulation by weak solution with certain degree of superheat.
Adopt Aspen Plus software that the above embodiment is carried out analog computation, being chosen for of each rerum natura equation: the ammoniacal liquor system adopts the RK-SOAVE equation, and the thermal source hot-air adopts the PENG-ROB equation, and the water and steam system adopts the STEAM-TA equation.It is as shown in table 1 to simulate choosing of required basic parameter, and table 1 is the embodiment basic parameter that circulates.
Table 1
Suppose that system is in steady-state operation, the thermal performance of logistics analog computation result, co-generation system and branch product system relatively sees Table 2 to table 3 during balance condition.Table 2 is embodiment cyclic balance work condition state parameters, and table 3 is that co-generation system embodiment compares with the thermal performance that divides the product system.
Table 2
Table 3
As can be seen from Table 3, the embodiment of the invention co-generation system thermal efficiency is 39.3%, and score is produced system thermal efficiency and improved 53.3%; Under the condition of producing identical cold energy and electricity, embodiment co-generation system fractional energy savings is 34.8%.The basic reason that system of the present invention thermodynamic property improves is:
1, co-generation system utilizes the waste heat of power generation cycle to drive kind of refrigeration cycle, and middle low-temperature heat source then in the kind of refrigeration cycle utilization, has been realized " temperature counterpart, the cascade utilization " of heat earlier in the power generation cycle utilization.
2, inner waste heat is that the heat of tower still weak solution is fully utilized, and has reduced the external heat dissipation capacity of system.
3, the rectifying column irreversible loss of co-generation system reduces significantly.The traditional rectifying Tata still weak solution and the heat transfer temperature difference of thermal source medium are too big, cause Decrease big; And in the co-generation system, adopt the turbine steam discharge on power road to enter rectifying column, and be mixing heat-exchange, reduced heat transfer temperature difference.
4, the flue gas loss of co-generation system significantly reduces.The exhaust gas temperature of power generation cycle and kind of refrigeration cycle is all higher in the branch product system, smoke evacuation Decrease also bigger; And in the co-generation system, generating working medium and refrigeration working medium are heated in flue gas heat release in the solution heat exchanger on the steam generator of Power Generation Road and the road of freezing successively successively, have significantly reduced exhaust gas temperature, have reduced flue gas loss.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (14)

1. the circulation system of the cold alliance of mixed working fluid merit, it is characterized in that, this system comprises separator (1), high-pressure solution pump (2), hypotonic solution pump (3), high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), steam generator (6), waste heat solution heat exchanger (7), turbine (8), rectifying column (9), condenser (10), subcooler (11), ammonia choke valve (12), evaporimeter (13), solution choke valve (14) and absorber (15), wherein absorber (15) is connected with separator (1), separator (1) is connected to high-pressure solution pump (2) and hypotonic solution pump (3), high-pressure solution pump (2) connects the high-pressure solution heat exchanger (4) on power road, is steam generator (6) and turbine (8) afterwards; Hypotonic solution pump (3) connects the hypotonic solution heat exchanger (5) and the waste heat solution heat exchanger (7) on the road of freezing successively; Turbine (8) directly links to each other with rectifying column (9) respectively with waste heat solution heat exchanger (7), the top of rectifying column (9) connects condenser (10), subcooler (11), ammonia choke valve (12) and evaporimeter (13) successively, and the bottom of rectifying column (9) connects high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), solution choke valve (14) and absorber (15) successively.
2. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described separator (1) is a part flow arrangement, the quality shunting is carried out in the working medium logistics, its inlet is connected with the hot side outlet of absorber (15), and outlet is connected with hypotonic solution pump (3) with high-pressure solution pump (2) respectively.
3. the circulation system of the cold alliance of mixed working fluid merit according to claim 1 is characterized in that, described high-pressure solution pump (2) and hypotonic solution pump (3) are the liquid pressurized equipments, are used to improve fluid pressure; High-pressure solution pump (2) is connected between separator (1) and the high-pressure solution heat exchanger (4), and hypotonic solution pump (3) is connected between separator (1) and the hypotonic solution heat exchanger (5).
4. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described high-pressure solution heat exchanger (4), hypotonic solution heat exchanger (5), steam generator (6) and waste heat solution heater (7) are heat transmission equipments, are used to realize the exchange heat between hot and cold logistics; Wherein:
The hot side of high-pressure solution heat exchanger (4) is imported and exported and is connected with the hot side entrance of hypotonic solution heater (5) with rectifying column (9) taphole respectively, and cold side is imported and exported respectively and is connected with steam generator (6) cold side inlet with high-pressure solution pump (2); The hot side outlet of hypotonic solution heat exchanger (5) is connected with absorber (15) solution inlet port, and the cold side import is connected with waste heat solution heat exchanger (7) with hypotonic solution pump (3) respectively in the cold side import and export; The hot side outlet of steam generator (6) is connected with the hot side-entrance of waste heat solution heat exchanger (7), and the cold side outlet is connected with turbine (8) inlet; The outlet of waste heat solution heat exchanger (7) cold side connects rectifying column (9), and the heat of steam generator (6) input is industrial exhaust heat or solar energy.
5. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described turbine (8) is an acting device, the HTHP ammonia vapor expands therein and realizes externally acting, turbine (8) is imported and exported respectively and is connected with rectifying column (9) with the outlet of steam generator (6) cold side, and turbine (8) steam discharge directly enters rectifying column (9).
6. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described rectifying column (9) is used for that ammonia and water are carried out rectifying and separates, its top is connected with a condenser (10), and the dense ammonia steam condensation that condenser (10) is used for the rectifying separation is obtained is as refrigeration working medium; Rectifying institute calorific requirement is from turbine (8) exhausted spare heat, and the dilute ammonia solution of output enters high-pressure solution heat exchanger (4) at the bottom of the tower.
7. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described subcooler (11) is a heat transmission equipment, and hot side is imported and exported and connected condenser (10) and choke valve (12) respectively, and cold side is imported and exported and connected evaporimeter (13) and absorber (15) respectively; Ammoniacal liquor from condenser (10) cools off in this cryogenic refrigeration working medium by evaporimeter (13) outlet.
8. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described ammonia choke valve (12) is the expansion dropping equipment, and ammoniacal liquor is realized step-down, cooling by throttling, and its import and export are connected with evaporimeter (13) with subcooler (11) respectively.
9. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described evaporimeter (13) is used for the refrigeration working medium evaporation of absorbing heat therein, realizes cold output, and its import and export are connected with subcooler (11) with ammonia choke valve (12) respectively.
10. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, described absorber (15) is made of blender and condenser, and the logistics of variable concentrations working medium mixes in blender earlier, and total condensation is liquid in condenser then; The hot side of absorber (15) comprises that cold side is a cooling water from the ammonia steam of subcooler (11) with from the weak solution of solution choke valve (14).
11. the circulation system of the cold alliance of mixed working fluid merit according to claim 1 is characterized in that, described solution choke valve (14) connects hypotonic solution heat exchanger (5) and absorber (15).
12. the circulation system of the cold alliance of mixed working fluid merit according to claim 1, it is characterized in that, this system has an acting circulation and a kind of refrigeration cycle, the acting circulation is a working medium with the ammonia water mixture, to send into the acting of expanding in the steam turbine (8) at the hyperthermia and superheating ammonia vapor that steam generator (6) generates, rectifying column (9) and absorber (15) also are the composite devices of these two circulations for the tie point of acting circulation and kind of refrigeration cycle simultaneously.
13. the thermal circulation method of the cold alliance of mixed working fluid merit is applied to the described system of claim 1, it is characterized in that this method becomes superheated steam with the ammonia-water mixture thermal conversion, enters turbine acting generating; The turbine steam discharge enters rectifying column, obtains dense ammonia steam and weak aqua ammonia, realizes cold output and generates dense ammonia steam as refrigeration working medium after the condensation of wherein dense ammonia steam, and weak aqua ammonia pressurization back is condensed into ammonia-water mixture with dense ammonia vapor mixing.
14. the thermal circulation method of the cold alliance of mixed working fluid merit according to claim 13 is characterized in that this method specifically comprises:
The concentrated solution S1 that absorber (15) comes out is split into two gangs of S2 and S7 through separator (1) earlier, S2 precession power road wherein, the cold road of S7 system, S2 is advanced high-pressure solution heat exchanger (4) after high-pressure solution pump (2) pressurization, with weak solution S11 heat exchange from rectifying column (9), enter steam generator (6) evaporation then and enter turbine (8) acting of expanding after overheated, turbine (8) not condensation of steam discharge directly enters rectifying column (9); Another burst concentrated solution S7 passes through hypotonic solution heat exchanger (5) and waste heat solution heat exchanger (7) heating successively after hypotonic solution pump (3) pressurization, enter rectifying column (9) at last; In rectifying column (9),, in tower, be separated into tower still weak solution S11 and cat head ammonia steam S15 from the steam discharge S6 of turbine (8) and the mixed heat transfer that directly carries out contact from the concentrated solution S7 of waste heat solution heat exchanger (7); Tower still weak solution S11 successively flow through high-pressure solution heat exchanger (4) and hypotonic solution heat exchanger (5), after solution choke valve (14) throttling step-down, enter absorber (15) again, after cat head ammonia steam S 15 enters condenser (10) and is condensed into liquefied ammonia S16, enter subcooler (11), after the low temperature ammonia steam S19 heat exchange that comes flash-pot (13), formation has the liquefied ammonia S17 of certain degree of supercooling, and S17 enters evaporimeter (13) sweat cooling again through choke valve (12) throttling step-down becoming low pressure liquefied ammonia S18; Become ammonia steam S20 behind the low temperature ammonia steam S19 process subcooler (11), enter absorber (15) at last, absorbed, form concentrated solution S1 again and enter next circulation by weak solution with certain degree of superheat.
CN2010101754506A 2010-05-12 2010-05-12 Mixed working medium thermal circulating system and method for power and refrigeration cogeneration CN102242985B (en)

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CN103528264B (en) * 2012-07-03 2015-06-24 中国科学院工程热物理研究所 Combined type refrigeration system and method based on coupling between direct cycle and reverse cycle
CN103161528A (en) * 2013-03-07 2013-06-19 中国科学院工程热物理研究所 Work and coldness co-production system and method of recovering working medium effective ingredient refrigeration
CN103306763A (en) * 2013-05-29 2013-09-18 上海盛合新能源科技有限公司 Cooling power combined supplying system with ammonium hydroxide medium
CN104501528A (en) * 2014-12-11 2015-04-08 中国天辰工程有限公司 Precooling system and precooling method for producing liquefied natural gas by methane synthesis gas
CN106016822B (en) * 2016-05-18 2018-07-31 中国科学院工程热物理研究所 The warming heat pump circulatory system of waste heat and electric composite drive
CN106016822A (en) * 2016-05-18 2016-10-12 中国科学院工程热物理研究所 Waste heat and electricity composite drive temperature increasing type heat pump circulation system
CN105952598A (en) * 2016-06-06 2016-09-21 江苏乐科节能科技股份有限公司 Ammonia-water energy storage system and method
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WO2018068430A1 (en) * 2016-10-12 2018-04-19 李华玉 Steam combined cycle having single working fluid, and combined-cycle steam power device
CN107421157A (en) * 2017-06-14 2017-12-01 山东大学 A kind of ammonia absorption type power and spray type refrigerating combined cycle system and method
CN107421157B (en) * 2017-06-14 2019-12-24 山东大学 Ammonia absorption type power and injection type refrigeration composite circulation system and method
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WO2020211474A1 (en) * 2019-04-17 2020-10-22 李华玉 Single working medium steam combined cycle
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