CN112412560A - Kalina circulation system based on single screw expander - Google Patents
Kalina circulation system based on single screw expander Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
- F01K25/065—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids with an absorption fluid remaining at least partly in the liquid state, e.g. water for ammonia
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C13/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/106—Ammonia
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
Abstract
A kalina circulation system based on a single screw expander relates to the technical field of low-temperature waste heat utilization. The system comprises an evaporator, a separator, a turbine expander, a heat regenerator, a single-screw expander, an absorber, a condenser, a working medium pump and the like. The ammonia water mixed working medium is heated to boiling vaporization in the evaporator and the heat regenerator, lean ammonia water saturated liquid and rich ammonia water saturated gas are separated in the separator, liquid working medium and gaseous working medium respectively enter the single-screw expander and the turbine expander, then the generator is driven to generate electricity, and then the two working media are mixed in the condenser, condensed and re-pressurized to the evaporator and the heat regenerator through the working medium pump for circulation. The system can utilize low-grade heat sources such as flue gas waste heat and solar energy in industry to drive, recover expansion work lost in the throttling process, and effectively improve the energy utilization rate.
Description
Technical Field
The invention relates to the technical field of low-temperature waste heat utilization below 121 ℃, in particular to a kalina circulating system based on a single-screw expander.
Background
With the rapid development of society and economy, the demand for energy is also increasing, and the reserves of fossil energy on the earth are also sharply reduced. Therefore, in order to deal with energy problems, the use of low-grade heat sources is gradually brought into our view. A large amount of medium-low temperature waste heat is generated in the industries of petroleum, chemical engineering, metallurgy, cement and the like, but a large amount of boilers, condensation and heat exchange equipment discharge the low-temperature waste water and the low-temperature flue gas into the environment, so that huge energy waste is caused, and more serious environment heat pollution is caused. And some natural low-grade heat sources, such as geothermal energy, solar energy and the like, exist in the environment where the heat source is located. Therefore, the utilization of medium and low grade energy has attracted much attention in terms of energy problems.
The steam power cycle driven by the high-temperature heat source is very mature in power generation technology, but when the low-temperature heat source is used as the drive, the performance of the steam power cycle cannot achieve ideal effects, and the steam power cycle is not economically desirable. However, the organic Rankine cycle can recover heat from a low-temperature heat source by using a low-boiling organic working medium, so that the defect that water is required to be used as the working medium in a steam power cycle is overcome. In the organic Rankine cycle using pure working medium, the temperature difference between isothermal evaporation of the working medium and a heat source is large, so that an evaporator is caused
The loss is large. At the moment, the problem is just solved by the occurrence of kalina cycle, and the circulating working medium in the kalina cycle is an ammonia water mixture, has the temperature-variable evaporation characteristic and exchanges heat with a temperature-variable heat source in evaporationThe process has good matching performance, and reduces irreversible loss caused by limited temperature difference, so that the kalina cycle can achieve higher cycle efficiency. The KCS34g system in the kalina circulating system is just suitable for a small-sized power plant with the temperature lower than 121 ℃. However, in KCS34g, when the pressure of the lean ammonia saturated liquid circuit is reduced by using the throttle valve, a large amount of energy is lost due to the throttle.
Aiming at the problems, the invention provides a kalina circulating system based on a single-screw expander. The throttle valve is replaced by a single-screw expander on the basis of the original KCS34g to recover the expansion work lost in the throttling process, so that the heat efficiency of the system is improved.
Disclosure of Invention
The invention provides a kalina circulating system based on a single screw expander, aiming at the technical defects of the existing kalina circulating system in waste heat utilization, the system can utilize waste heat which is lower than 121 ℃ and is generated in an industrial process or low-temperature heat sources such as geothermal heat, and the like, and the energy of the throttling loss of the poor ammonia water solution is recovered through the single screw expander, so that the energy-saving effect can be effectively achieved, and in the process, the low-grade heat energy is converted into high-grade electric energy.
The kalina circulating system based on the single screw expander comprises an evaporator, a separator, a turbine expander, a heat regenerator, the single screw expander, an absorber, a condenser, a working medium pump and the like. The evaporator and the inlet of the regenerator are two separated pipelines from the pump; the inlet of the separator is connected with the outlets of the evaporator and the heat exchanger, and the two outlets of the separator are connected with the single-screw expander and the turbine expander; the turbine expander is coaxially connected with the single-screw expander and is connected with the generator; the condenser is a plate heat exchanger; the pump is a centrifugal variable frequency pump and is connected with the evaporator, the heat regenerator and the condenser through pipelines.
Furthermore, the evaporator is provided with an inlet and an outlet of low-grade heat sources such as low-temperature waste heat below 121 ℃ discharged in the industrial process, the pipeline of the evaporator for heating the ammonia water mixed working medium adopts a snakelike finned tube, and the pipeline arrangement of the evaporator adopts a countercurrent mode.
Furthermore, the separator has a good separation effect, and an outlet after separation is connected with the single-screw expander and the turbine expander through a pipeline.
Furthermore, the single-screw expander is high in efficiency, and an inlet of the single-screw expander is connected with the lean ammonia water saturated liquid outlet of the separator through a pipeline and is coaxially connected with the turboexpander.
Furthermore, the turboexpander has excellent performance, is safe and reliable, and an inlet is connected with the rich ammonia water saturated gas outlet of the separator through a pipeline, is coaxially connected with the single-screw expander and is connected with a generator.
Further, the heat regenerator is a plate heat exchanger.
Furthermore, the condenser is a plate heat exchanger, the adopted cooling mode is water cooling, the inside of the condenser is provided with an inlet and an outlet of a cooling medium, a pipeline for cooling the ammonia water mixed working medium also adopts a snakelike finned tube, and the pipeline arrangement adopts a countercurrent arrangement method.
Further, the pump is a centrifugal variable frequency pump.
Furthermore, the driving heat source in the system is low-temperature flue gas and waste water which are generated in an industrial process and are lower than 121 ℃, or medium and low-grade energy sources such as geothermal energy and solar energy and the like. The adopted circulating working medium is an ammonia water mixture.
Furthermore, the circulating working medium adopted in the system is an ammonia water mixture, the ammonia water mixture belongs to a non-azeotropic mixed working medium, the system has the characteristic of variable temperature evaporation, the irreversible loss generated by temperature difference is reduced, and the thermodynamic performance and the chemical stability are better.
The invention has the advantages that:
1. the kalina circulating system based on the single-screw expander can utilize low-temperature waste heat generated in the industry and lower than 121 ℃, can also utilize geothermal energy and solar energy lower than 121 ℃, and has a wider range of application of low-grade heat energy.
2. The system uses the single-screw expander to replace a throttle valve, recovers expansion work lost in the throttling process, increases the working capacity, improves the heat efficiency and achieves better energy-saving effect.
3. The system can also obtain the pressure reduction effect of the original throttle valve by using a single-screw expander.
4. The single screw expander and the turbine expander are mature in technology and can be controlled.
5. The system operating pressure is relatively low.
Drawings
Fig. 1 is a schematic diagram of a kalina cycle system based on a single screw expander. In the figure:
the system comprises an evaporator (1), a separator (2), a single-screw expander (4), a turbine expander (3), a heat regenerator (5), an absorber (6), a condenser (7) and a pump (8).
Detailed Description
The following description will explain embodiments of the present invention by referring to the figures.
Fig. 1 is a schematic diagram of a kalina cycle system based on a single screw expander, which includes an evaporator, a separator, a turbo expander, a heat regenerator, a single screw expander, an absorber, a condenser, a working medium pump, and the like. The inlet end of the low-temperature side of the evaporator is connected in parallel with the inlet end of the low-temperature side of the heat regenerator, the inlet end of the parallel connection rear end is connected in series with the pump, the outlet end of the parallel connection rear end is connected in series with the separator, the outlet end of one end of the separator is connected in series with the inlet end of the turboexpander, the outlet end of the other end of the separator is connected in series with the inlet end of the single-screw expander, the inlet end of the high-temperature side of the heat regenerator is connected in series with the outlet of the single-screw expander, the outlet end of the turboexpander is connected in parallel with the outlet end of the high-temperature side of the. The inlet end of the low-temperature side of the condenser is connected with cooling water, and the outlet end of the low-temperature side of the condenser is connected with an external cooling tower for heat dissipation.
The driving heat source in the system is low-temperature flue gas and waste water which are generated in the industrial process and are lower than 121 ℃, or medium-low-grade energy sources such as geothermal energy and solar energy which are lower than 121 ℃ are used as driving. The adopted circulating working medium is an ammonia water mixture.
The circulating working medium adopted in the system is an ammonia water mixture, the ammonia water mixture belongs to a non-azeotropic mixed working medium, the system has the characteristic of variable temperature evaporation, the irreversible loss generated by temperature difference is reduced, and the thermodynamic performance and the chemical stability are good.
The overall cycle of the system is described as follows:
the cooling water valve is opened first to make the cooling water circulate in the condenser first. The ammonia water working medium is stored in the condenser, and the valves of the single-screw expander and the turbine expander are closed. A bypass is arranged on a pipeline at the inlet of the single-screw expander, and a display working medium circulates in a loop of an evaporator, a separator, the single-screw expander bypass, a heat regenerator, an absorber, a condenser and a pump. And then opening a pipeline valve for providing waste heat for the evaporator, heating the ammonia-water mixed working medium in the evaporator and the heat regenerator, and opening pipeline valves of the single-screw expander and the turbine expander when the pressure reaches 50% of a set working condition so as to enable the system to start to integrally operate. And after the system runs stably, adjusting the rotating speed of the pump to gradually increase the pressure to the set working condition.
Example 1: in the simulation calculation process, ammonia water mixture is used as a working medium, and the device shown in figure 1 of the invention is compared with the conventional KCS34 g. The temperature and the flow of the heat source inlet and outlet are respectively set to be 400K and 1kg/s in the calculation; the assumed inlet temperature of the cooling water is 290K, and the flow rate is 1 kg/s; the mass flow ratio of the pumped working medium going to the evaporator and the heat regenerator is set as 12; the heat transfer end difference of the condenser is 2K, the logarithmic heat transfer end difference of the evaporator is 30K, and the isentropic efficiencies of the single-screw expander and the turbine expander are 65% and 80% respectively; the pump efficiency was 80%. Under the setting of the parameters, the invention respectively compares the cycle performance of the KCS34 with that of the traditional KCS under 4 evaporation pressures, and the selected evaporation pressures are respectively 1.5MPa, 2.0MPa, 2.5MPa and 3.0 MPa.
The first table and the fourth table are respectively the performance comparison of the device of the invention and the traditional KCS34g under the evaporation pressure of 1.5MPa to 3.0 MPa.
TABLE 1.5MPa
| Working conditions | x | WKCS 34g(kW) | ηfir，KCS 34g | ηex，KCS 34g | Wnew(kW) | ηfir，new | ηex，new |
| Working condition 1 | 0.35 | 1.017 | 0.02155 | 0.07395 | 1.231 | 0.08079 | 0.2773 |
| |
0.4 | 2.812 | 0.05959 | 0.2045 | 2.98 | 0.09426 | 0.3235 |
| |
0.45 | 3.625 | 0.07682 | 0.2636 | 3.763 | 0.09757 | 0.3348 |
| |
0.5 | 3.93 | 0.08329 | 0.2858 | 4.046 | 0.09598 | 0.3294 |
| |
0.55 | 3.959 | 0.08391 | 0.288 | 4.059 | 0.09162 | 0.3144 |
| |
0.6 | 3.844 | 0.08145 | 0.2795 | 3.93 | 0.0861 | 0.2955 |
| |
0.65 | 3.661 | 0.07759 | 0.2663 | 3.737 | 0.08043 | 0.276 |
| |
0.7 | 3.462 | 0.07336 | 0.2517 | 3.529 | 0.07505 | 0.2576 |
| Operating mode 9 | 0.75 | 3.282 | 0.06956 | 0.2387 | 3.343 | 0.07053 | 0.242 |
| Operating mode 10 | 0.8 | 3.139 | 0.06652 | 0.2283 | 3.193 | 0.06708 | 0.2302 |
| Operating mode 11 | 0.85 | 3.026 | 0.06412 | 0.22 | 3.076 | 0.06439 | 0.221 |
| Operating mode 12 | 0.9 | 2.942 | 0.06236 | 0.214 | 2.989 | 0.06242 | 0.2142 |
TABLE 2.0MPa
| Working conditions | x | WKCS 34g(kW) | ηfir，KCS 34g | ηex，KCS 34g | Wnew(kW) | ηfir，new | ηex，new |
| Working condition 1 | 0.4 | 0.2189 | 0.004639 | 0.01592 | 3.278 | 0.07411 | 0.2543 |
| |
0.45 | 2.402 | 0.05089 | 0.1747 | 4.333 | 0.09183 | 0.3151 |
| |
0.5 | 3.464 | 0.07342 | 0.252 | 4.646 | 0.09846 | 0.3379 |
| |
0.55 | 3.963 | 0.08399 | 0.2882 | 4.697 | 0.09953 | 0.3416 |
| |
0.6 | 4.163 | 0.08822 | 0.3028 | 4.631 | 0.09814 | 0.3368 |
| |
0.65 | 4.207 | 0.08915 | 0.3059 | 4.503 | 0.09543 | 0.3275 |
| |
0.7 | 4.18 | 0.08859 | 0.304 | 4.369 | 0.09258 | 0.3177 |
| |
0.75 | 4.134 | 0.08761 | 0.3007 | 4.253 | 0.09012 | 0.3093 |
| Operating mode 9 | 0.8 | 4.097 | 0.08683 | 0.298 | 4.17 | 0.08837 | 0.3033 |
| Operating mode 10 | 0.85 | 4.078 | 0.08642 | 0.2966 | 4.118 | 0.08727 | 0.2995 |
| Operating mode 11 | 0.9 | 4.07 | 0.08626 | 0.296 | 4.087 | 0.08661 | 0.2972 |
| Operating mode 12 | 0.94 | 4.062 | 0.08608 | 0.2954 | 4.064 | 0.08612 | 0.2956 |
TABLE 2.5MPa
| Working conditions | x | WKCS 34g(kW) | ηfir，KCS 34g | ηex，KCS 34g | Wnew(kW) | ηfir，new | ηex，new |
| Working condition 1 | 0.5 | 2.227 | 0.0472 | 0.162 | 4.312 | 0.09138 | 0.3136 |
| |
0.55 | 3.421 | 0.07249 | 0.2488 | 4.715 | 0.09992 | 0.3429 |
| |
0.6 | 4.044 | 0.0857 | 0.2941 | 4.871 | 0.1032 | 0.3543 |
| |
0.65 | 4.368 | 0.09257 | 0.3177 | 4.901 | 0.1039 | 0.3564 |
| |
0.7 | 4.539 | 0.0962 | 0.3301 | 4.887 | 0.1036 | 0.3554 |
| |
0.75 | 4.64 | 0.09833 | 0.3375 | 4.866 | 0.1031 | 0.3559 |
| |
0.8 | 4.715 | 0.09993 | 0.3429 | 4.859 | 0.103 | 0.3524 |
| |
0.85 | 4.786 | 0.1014 | 0.3481 | 4.871 | 0.1032 | 0.3542 |
| Operating mode 9 | 0.9 | 4.854 | 0.1029 | 0.353 | 4.894 | 0.1037 | 0.356 |
| Operating mode 10 | 0.95 | 4.902 | 0.1039 | 0.3565 | 4.909 | 0.104 | 0.357 |
| Operating mode 11 | 0.96 | 4.907 | 0.104 | 0.3569 | 4.908 | 0.104 | 0.3569 |
TABLE 3.0MPa
| Working conditions | x | WKCS 34g(kW) | ηfir，KCS 34g | ηex，KCS34g | Wnew(kW) | ηfir，new | ηex，new |
| Working condition 1 | 0.55 | 2.232 | 0.04731 | 0.1623 | 4.38 | 0.09282 | 0.3186 |
| |
0.6 | 3.486 | 0.07387 | 0.2535 | 4.841 | 0.1026 | 0.3521 |
| |
0.65 | 4.184 | 0.08867 | 0.3043 | 5.06 | 0.1072 | 0.368 |
| |
0.7 | 4.607 | 0.09763 | 0.3351 | 5.182 | 0.1098 | 0.3769 |
| |
0.75 | 4.883 | 0.1035 | 0.3551 | 5.262 | 0.1115 | 0.3827 |
| |
0.8 | 5.088 | 0.1078 | 0.37 | 5.332 | 0.113 | 0.3878 |
| |
0.85 | 5.256 | 0.1114 | 0.3822 | 5.403 | 0.1145 | 0.393 |
| |
0.9 | 5.401 | 0.1145 | 0.3928 | 5.476 | 0.1161 | 0.3983 |
| Operating mode 9 | 0.95 | 5.512 | 0.1168 | 0.4008 | 5.531 | 0.1172 | 0.4022 |
| Operating mode 10 | 0.97 | 5.54 | 0.1174 | 0.4029 | 5.541 | 0.1174 | 0.403 |
X in the table represents the concentration of the ammonia water mixed working medium at the evaporator, WKCS 34gRefers to the net output work, η, of conventional KCS34gfir，KCS 34gRefers to the thermal efficiency, eta, of conventional KCS34gex，KCS 34gRefers to conventional KCS34g
Efficiency, WnewRefers to the net output work, η, of the device of the present inventionfir，newRefers to the thermal efficiency, eta, of the apparatus of the inventionex，newIn the sense of the apparatus of the invention
Efficiency.
The results of the simulation calculations in the table show that the device of the present invention performs better than the original KCS34g at different evaporating pressures using a single screw expander to recover the expansion work lost during throttling. The maximum performance advantage of the device of the invention compared with the original KCS34g is shown in a lower concentration under the same evaporation pressure, and when the evaporation pressure is 2.0MPa and the concentration is 0.5, the net output work of the device of the invention is 34.12 percent higher than that of the original KCS34 g. The cycling performance of the device of the present invention is closer to the original KCS34g as the evaporation pressure or concentration is gradually increased, but is consistently better than the conventional KCS34 g.
Claims (8)
1. A kalina circulating system based on a single screw expander is characterized in that in the circulating system, the inlet end of the low-temperature side of the evaporator (1) is connected in parallel with the inlet end of the low-temperature side of the heat regenerator, the parallel rear inlet end is connected with a pump (8) in series, the parallel outlet end is connected with a separator (2) in series, the outlet at one end of the separator (2) is connected with the inlet end of a turbine expander (3) in series, the outlet at the other end of the separator (2) is connected with the inlet end of a single-screw expander (4) in series, the inlet end at the high-temperature side of a heat regenerator (5) is connected with the outlet of the single-screw expander in series, the outlet end of the turbine expander (3) is connected with the outlet end at the high-temperature side of the heat regenerator (5) in parallel and then enters an absorber (6), the outlet end of the absorber (6) is connected with the inlet end at the high-temperature side of a condenser (7) in series, and; the inlet end of the low-temperature side of the condenser (7) is connected with cooling water, and the outlet end of the low-temperature side of the condenser (7) is connected with an external cooling tower for heat dissipation; the single-screw expander (4) is coaxially connected with the turbine expander (3).
2. The kalina cycle system based on the single screw expander according to claim 1, wherein: the evaporator (1) is provided with an inlet end and an outlet end of a low-grade heat source which is discharged in an industrial process and is lower than 121 ℃, a pipeline for heating the ammonia water mixed working medium of the evaporator adopts a snakelike finned tube, and the pipeline arrangement of the evaporator adopts a countercurrent mode.
3. The kalina cycle system based on the single screw expander according to claim 1, wherein: the single screw expander (4) and the turbine expander (3) are both connected with a generator.
4. The kalina cycle system based on the single screw expander according to claim 1, wherein: the heat regenerator (5) is a plate heat exchanger.
5. The kalina cycle system based on the single screw expander according to claim 1, wherein: the plate heat exchanger of the condenser (7) adopts a water cooling mode, the inside of the plate heat exchanger is provided with an inlet end and an outlet end of a cooling medium, a pipeline for cooling the ammonia water mixed working medium also adopts a snakelike finned tube, and the pipeline arrangement adopts countercurrent arrangement.
6. The kalina cycle system based on the single screw expander according to claim 1, wherein: the pump (8) is a centrifugal variable frequency pump.
7. The kalina cycle system based on the single screw expander according to claim 1, wherein: the driving heat source in the system is low-temperature flue gas and waste water which are generated in an industrial process and are lower than 121 ℃.
8. The kalina cycle system based on the single screw expander according to claim 1, wherein: the circulating working medium adopted in the system is an ammonia water mixture.
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| Publication number | Priority date | Publication date | Assignee | Title |
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