A Kalina cycle power generation system with variable working fluid

Abstract

The present invention discloses a Kalina cycle power generation system with variable working fluid, which includes a power generation module and a variable working fluid module. The power generation module includes an expansion generator, a condenser, a working fluid pump, an evaporator, a check valve and a concentration measuring instrument. The expansion generator is connected to the condenser and the evaporator. The check valve is connected to the condenser and the working fluid pump. The concentration measuring instrument is connected between the working fluid pump and the evaporator. The variable working fluid module is connected to both ends of the check valve. The variable working fluid module includes a rectifying component, a transition component, a working fluid tank and a regulating pump. The transition component is arranged between the rectifying component and the working fluid tank. The regulating pump is connected to the working fluid tank and the check valve. This system effectively utilizes the wasted energy by using waste heat resources, protects the ecological environment, and is of great significance for the effective utilization of renewable resources. By adjusting the proportion of ammonia water in the circulating working fluid, the optimal working condition of the system cycle is achieved, and environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of Kalina cycle power generation, and in particular to a Kalina cycle power generation system with variable working fluid. Background Art

[0002] Energy is the cornerstone of the progress and development of human society, and the development of a country's society is bound to be accompanied by a large amount of energy consumption. In the 1970s, the oil crisis broke out, and people realized the importance of energy and began to explore the utilization of new energy and the research of new technologies. In industrial production, a large amount of medium and low temperature waste heat has not been fully utilized, resulting in a large amount of energy and economic losses. With the gradual aggravation of environmental problems and energy shortages, the Kalina cycle technology, as an effective way to recover low-grade heat energy, can be used to recover the waste heat resources discharged in industrial processes.

[0003] Compared with the Rankine cycle, a Kalina cycle power plant can provide a cycle efficiency 50% higher than the former for geothermal low-level heat sources such as those at a temperature of 300 - 400 °F (149 - 204 °C). For high-temperature heat sources such as the exhaust gas of a gas turbine in a direct-fired boiler and a gas-steam combined cycle power plant, the cycle efficiency can be increased by about 20%.

[0004] The Kalina cycle breaks through the limitation of the traditional Rankine cycle that only selects a single working fluid, and uses an ammonia-water mixture as the cycle working fluid, greatly improving the cycle efficiency of the system. At the same time, different ammonia-water composition ratios will have different thermophysical properties, which can meet the operating requirements under different system conditions.

[0005] In current Kalina cycle projects, the cycle working fluid used is basically ammonia water with a fixed mixing ratio. The problem faced is that the thermal efficiency is low when the temperature of the waste heat resources fluctuates greatly. By setting a variable working fluid device, the ammonia water with different mixing ratios can be adjusted according to the real-time working conditions to fit the system to reach the optimal working condition, without the need to stop the unit to replace the cycle working fluid. Therefore, designing a Kalina cycle power generation system that can vary the working fluid can not only reduce the harm of the cycle working fluid to the environment, but also improve the thermal efficiency of the cycle system. Summary of the Invention

[0006] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, the abstract of the specification and the title of the invention of this application to avoid obscuring the purpose of this part, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the above and / or problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the technical problem to be solved by the present invention is that the composition ratio of the circulating working fluid in the traditional Kalina cycle system is single, the ratio cannot be adjusted, and the energy utilization rate is low.

[0009] To solve the above technical problem, the present invention provides the following technical solution: A Kalina cycle power generation system with variable working fluid, including a power generation module, which includes an expansion generator, a condenser, a working fluid pump, an evaporator, a check valve and a concentration measuring instrument. The expansion generator is connected to the condenser and the evaporator. The check valve is connected to the condenser and the working fluid pump. The concentration measuring instrument is connected to the working fluid pump and the evaporator; a variable working fluid module, and the variable working fluid module is connected to both ends of the check valve.

[0010] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: the variable working fluid module includes a rectifying component, a transition component, a working fluid tank and a regulating pump. The transition component is arranged between the rectifying component and the working fluid tank. The regulating pump is connected to the working fluid tank and the check valve.

[0011] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: the regulating pump includes a liquid outlet, a first liquid inlet and a second liquid inlet. The first liquid inlet and the second liquid inlet are arranged above the regulating pump, and the liquid outlet is arranged below the regulating pump.

[0012] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: the working fluid tank includes a first accommodating tank and a second accommodating tank. The first accommodating tank is connected to the first liquid inlet, and the second accommodating tank is connected to the second liquid inlet.

[0013] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: the transition component includes a first transition tank and a second transition tank. The first transition tank is connected to the first accommodating tank, and the second transition tank is connected to the second accommodating tank.

[0014] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: the rectifying component includes a rectifying column, a heat exchanger and a reboiler. The heat exchanger is connected to the rectifying column and the first transition tank, and the reboiler is connected to the rectifying column and the second transition tank.

[0015] As a preferred solution of the Kalina cycle power generation system with variable working fluid of the present invention, wherein: it further includes a control module, which includes a switch component, a water control valve, a liquid mixing component, a data acquisition component and an operation component. The switch component is arranged on the rectifying column. The water control valve is arranged on the transition component. The liquid mixing component is arranged on the regulating pump; the operation component is connected to the data acquisition component, and the data acquisition component is connected to the switch component, the water control valve and the liquid mixing component.

[0016] As a preferred embodiment of the Kalina cycle power generation system with variable working fluid according to the present invention, wherein: the switching member includes a first switching valve and a second switching valve, the first switching valve is disposed between the first transition tank and the first accommodating tank, and the second switching valve is disposed between the second transition tank and the second accommodating tank.

[0017] As a preferred embodiment of the Kalina cycle power generation system with variable working fluid according to the present invention, wherein: the liquid mixing member includes a first control valve and a second control valve, the first control valve is disposed between the first accommodating tank and the first liquid inlet, and the second control valve is disposed between the second accommodating tank and the second liquid inlet.

[0018] As a preferred embodiment of the Kalina cycle power generation system with variable working fluid according to the present invention, wherein: the variable working fluid module further includes a water tank, and the water control valve includes a first water-saving valve and a second water-saving valve; the first water-saving valve connects the water tank and the first accommodating tank, and the second water-saving valve connects the water tank and the second accommodating tank.

[0019] Advantages of the present invention: On the one hand, the system effectively utilizes waste heat resources and wasted energy, which is of great significance for replacing some fossil fuels, protecting the ecological environment, and realizing the effective utilization of renewable resources. On the other hand, combined with the variable working fluid device, the adjustment of the ammonia-water ratio of the circulating working fluid is carried out to achieve the optimal operating condition of the system cycle and reduce environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the power generation module in the Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the transition member in the Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0024] Figure 4Schematic diagram of the structure of the working fluid tank in a Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0025] Figure 5 Schematic diagram of the internal structure of the regulating pump in a Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0026] Figure 6 Schematic diagram of the structure of the regulating pump in a Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention;

[0027] Figure 7 Schematic diagram of the connection of the control module in a Kalina cycle power generation system with variable working fluid according to an embodiment provided by the present invention. Detailed implementation manners

[0028] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given in conjunction with the accompanying drawings of the specification.

[0029] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0030] Secondly, the present invention will be described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structures will be enlarged locally out of the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0031] Furthermore, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0032] Embodiment 1

[0033] Refer to Figure 1, the present invention provides a Kalina cycle power generation system with variable working fluid, which includes a power generation module 100 and a variable working fluid module 200. The power generation module 100 includes an expansion generator 101, a condenser 102, a working fluid pump 103, an evaporator 104, a check valve 105, and a concentration measuring instrument 106. The expansion generator 101 is connected to the condenser 102 and the evaporator 104. The check valve 105 is connected to the condenser 102 and the working fluid pump 103. The concentration measuring instrument 106 is connected between the working fluid pump 103 and the evaporator 104.

[0034] The variable working fluid module 200 is connected to both ends of the check valve 105. The variable working fluid module 200 includes a rectifying component 201, a transition component 202, a working fluid tank 203, and a regulating pump 204. The transition component 202 is arranged between the rectifying component 201 and the working fluid tank 203. The regulating pump 204 is connected to the working fluid tank 203 and the check valve 105.

[0035] In this embodiment, the Kalina cycle power generation system utilizes ammonia water to circulate in the power generation module 100 for power generation. Specifically, the ammonia water absorbs heat from the low-temperature waste heat source in the evaporator 104 to generate steam with a certain temperature and pressure. The steam is transported to the expansion generator 101 to do work and drive the generator to generate electricity. The steam discharged from the expansion generator 101 exchanges heat with cooling water in the condenser 102 and becomes liquid, then enters the working fluid pump 103 through the check valve 105, and is pushed by the working fluid pump 103 into the evaporator 104 for recycling. The concentration measuring instrument 106 is used to measure the concentration of ammonia water after a single cycle.

[0036] The variable working fluid module 200 is used to adjust the concentration of ammonia water after a single cycle. After the ammonia water is condensed back to liquid by the condenser 102, it is transported into the variable working fluid module 200 for proportioning. After the proportioning is completed, it is transported into the working fluid pump 103 for the next step. The variable working fluid module 200 is connected in parallel on both sides of the check valve 105. It should be noted that control valves are provided at the connection between the variable working fluid module 200 and the condenser 102 and at the connection with the working fluid pump 103. If the ammonia water enters the working fluid pump 103 from the check valve 105, the ammonia water does not enter the variable working fluid module 200 for proportion adjustment. Specifically, the specific proportioning process of the ammonia water by the variable working fluid module 200 is as follows: the condensed ammonia water enters the rectifying component 201, and after rectifying separation by the rectifying component 201, two portions of ammonia water with different concentrations are obtained, one with a high concentration and one with a low concentration. The two portions of ammonia water enter the transition component 202 for temporary storage. After measuring their concentrations, a diluent is appropriately added for proportioning to obtain two standard ammonia water solutions to be proportioned. Subsequently, the two solutions are transported to the working fluid tank 203 for storage and preparation. The two solutions are transported from the working fluid tank to the regulating pump 204 at a certain ratio for mixing and proportioning to obtain the ammonia water solution with the required concentration. This ammonia water solution is output from the regulating pump 204 to the working fluid pump 103 and enters the power generation module for circulation.

[0037] The variable working fluid module 200, as a part for auxiliary power generation, can assist in adjusting the concentration of ammonia water recycled in the power generation module, change the ammonia water concentration according to the heat source condition, so as to achieve the best power generation efficiency and expand the applicable range of the power generation system. In addition, after the ammonia water circulates for a certain time, there will be certain losses and changes in concentration. The variable working fluid module 200 can adjust according to the ammonia water concentration in the cycle feedback by the concentration measuring instrument 106, and keep the ammonia water at a certain concentration for recycling.

[0038] The circulating working fluid in the Kalina cycle power generation device is ammonia water. Ammonia water has different thermophysical properties under different mixing ratios, and the mixing ratio of ammonia water can be adjusted and changed by the variable working fluid module 200. The ammonia water concentration in the system can be measured by the concentration measuring instrument 106 after the outlet of the working fluid pump 103.

[0039] Embodiment 2

[0040] Referring to Figures 2 to 5 , the difference between this embodiment and the previous embodiment is that the regulating pump 204 includes a liquid outlet 204a, a first liquid inlet 204b and a second liquid inlet 204c. The first liquid inlet 204b and the second liquid inlet 204c are arranged above the regulating pump 204, and the liquid outlet 204a is arranged below the regulating pump 204.

[0041] The working fluid tank 203 includes a first accommodating tank 203a and a second accommodating tank 203b. The first accommodating tank 203a is connected to the first liquid inlet 204b, and the second accommodating tank 203b is connected to the second liquid inlet 204c.

[0042] The transition part 202 includes a first transition tank 202a and a second transition tank 202b. The first transition tank 202a is connected to the first accommodating tank 203a, and the second transition tank 202b is connected to the second accommodating tank 203b.

[0043] The rectifying part 201 includes a rectifying tower 201a, a heat exchanger 201b and a reboiler 201c. The heat exchanger 201b connects the rectifying tower 201a and the first transition tank 202a, and the reboiler 201c connects the rectifying tower 201a and the second transition tank 202b.

[0044] In this embodiment, the ammonia water output from the condenser 102 enters the rectification column 201a. After rectification and separation, the high-concentration ammonia water enters the heat exchanger 201b and is output to the first transition tank 202a, while the low-concentration ammonia water enters the reboiler 201c and is output to the second transition tank 202b. It should be noted that concentration measuring instruments are provided between the heat exchanger 201b and the first transition tank 202a, and between the reboiler 201c and the second transition tank 202b to monitor the actual concentration value in real time. After the high-concentration ammonia water is temporarily stored in the first transition tank 202a to obtain its concentration, it is transported to the first storage tank 203a and adjusted to a fixed ratio in the first storage tank 203a. After the low-concentration ammonia water is temporarily stored in the second transition tank 202b to obtain its concentration, it is transported to the second storage tank 203b and adjusted to a fixed low concentration value. Subsequently, the ammonia water of the two concentrations is transported to the regulating pump 204 according to the calculated ratio for mixing, and then enters the working medium pump 103 to enter the cycle.

[0045] The regulating pump 204 further includes a first internal cavity 204d, a second internal cavity 204e, and a mixing cavity 204f. The first liquid inlet 204b communicates with the first internal cavity 204d, and the second liquid inlet 204c communicates with the second internal cavity 204e. The first internal cavity 204d communicates with the mixing cavity 204f through a first valve port 204d-1, and the second internal cavity 204e communicates with the mixing cavity 204f through a second valve port 204e-1. Controllable valves are provided at both the first valve port 204d-1 and the second valve port 204e-1. After they are opened, the flow rates per unit time are the same, and the total amount of the mixed solution input is calculated according to the opening time.

[0046] A stirring member is provided in the mixing cavity 204f. The stirring member is driven by a motor to drive a fan-shaped member to rotate to drive the liquid to mix. The liquid outlet 204a communicates with the mixing cavity 204f. An opening and closing member 204a-1 and a sealing member 204a-2 are provided at the opening of the mixing cavity 204f where the liquid outlet 204a is located. The opening and closing member 204a-1 is hemispherical and has an opening thereon. The mixed ammonia water can flow out from the opening to the liquid outlet 204a. A cavity is provided inside the opening and closing member 204a-1, and the sealing member 204a-2 is provided in the high cavity and can rotate therein. Rotating the sealing member 204a-2 can control the liquid flow rate passing through the opening and closing member 204a-1.

[0047] Embodiment 3

[0048] Refer to Figures 1 to 7, the present invention provides a Kalina cycle power generation system with variable working fluid, which includes a power generation module 100 and a variable working fluid module 200. The power generation module 100 includes an expansion generator 101, a condenser 102, a working fluid pump 103, an evaporator 104, a check valve 105 and a concentration measuring instrument 106. The expansion generator 101 is connected to the condenser 102 and the evaporator 104. The check valve 105 is connected to the condenser 102 and the working fluid pump 103. The concentration measuring instrument 106 is connected between the working fluid pump 103 and the evaporator 104.

[0049] The variable working fluid module 200 is connected to both ends of the check valve 105; the variable working fluid module 200 includes a rectifying component 201, a transition component 202, a working fluid tank 203 and a regulating pump 204. The transition component 202 is arranged between the rectifying component 201 and the working fluid tank 203. The regulating pump 204 is connected to the working fluid tank 203 and the check valve 105.

[0050] The regulating pump 204 includes a liquid outlet 204a, a first liquid inlet 204b and a second liquid inlet 204c. The first liquid inlet 204b and the second liquid inlet 204c are arranged above the regulating pump 204, and the liquid outlet 204a is arranged below the regulating pump 204.

[0051] The working fluid tank 203 includes a first accommodating tank 203a and a second accommodating tank 203b. The first accommodating tank 203a is connected to the first liquid inlet 204b, and the second accommodating tank 203b is connected to the second liquid inlet 204c.

[0052] The transition component 202 includes a first transition tank 202a and a second transition tank 202b. The first transition tank 202a is connected to the first accommodating tank 203a, and the second transition tank 202b is connected to the second accommodating tank 203b.

[0053] The rectifying component 201 includes a rectifying column 201a, a heat exchanger 201b and a reboiler 201c. The heat exchanger 201b is connected to the rectifying column 201a and the first transition tank 202a, and the reboiler 201c is connected to the rectifying column 201a and the second transition tank 202b.

[0054] It further includes a control module 300, which includes a switch 301, a water control valve 302, a liquid mixing component 303, a data acquisition component 304 and an arithmetic component 305. The switch 301 is arranged on the rectifying column 201a, the water control valve 302 is arranged on the transition component 202, and the liquid mixing component 303 is arranged on the regulating pump 204;

[0055] The arithmetic component 305 is connected to the data acquisition component 304, and the data acquisition component 304 is connected to the switch 301, the water control valve 302 and the liquid mixing component 303.

[0056] The switching member 301 includes a first switching valve 301a and a second switching valve 301b. The first switching valve 301a is disposed between the first transition tank 202a and the first accommodation tank 203a, and the second switching valve 301b is disposed between the second transition tank 202b and the second accommodation tank 203b.

[0057] The liquid mixing member 303 includes a first control valve 303a and a second control valve 303b. The first control valve 303a is disposed between the first accommodation tank 203a and the first liquid inlet 204b, and the second control valve 303b is disposed between the second accommodation tank 203b and the second liquid inlet 204c.

[0058] The first control valve 303a is specifically disposed at the first valve port 204d-1, and the second control valve 303b is specifically disposed at the second valve port 204e-1 to control the on / off of the openings of both.

[0059] The working fluid changing module 200 further includes a water tank 205, and the water control valve 302 includes a first water control valve 302a and a second water control valve 302b;

[0060] The first water control valve 302a is connected to the water tank 205 and the first accommodation tank 203a, and the second water control valve 302b is connected to the water tank 205 and the second accommodation tank 203b.

[0061] In this embodiment, the control module 300 detects the ammonia water concentration flowing through each component in the working fluid changing module 200 and adjusts the ratio. Specifically, the data acquisition member 304 collects the ammonia water concentration data measured by the concentration measuring instruments 106 disposed at various places and transmits it to the computing member 205 for calculation, and then feeds it back to the switching member 301, the water control valve 302, the liquid mixing member 303, etc. for actual control. Specifically, the computing member 205 can be a microcomputer, specifically a single-chip microcomputer, and the data acquisition member 304 is a storage component on the single-chip microcomputer.

[0062] Specifically, the control module 300 is described in combination with the actual situation; the final ammonia water a value is input into the power generation module 100 for use at 30%. The standard standby high-concentration ammonia water d in the first accommodation tank 203a is 60%, and the standard standby low-concentration ammonia water e in the second accommodation tank 203b is 10%. After the ammonia water d and the ammonia water e enter the first inner cavity 204d and the second inner cavity 204e respectively, the computing member 305 operates on the collected data, and specifically obtains that the actual mixing ratio of the ammonia water d and the ammonia water e is 2:3, that is, the opening time ratio of the first control valve 303a and the second control valve 303b is controlled to be 2:3.

[0063] The ammonia water condensed by the condenser 102 enters the rectifying column 201a. After separation in the rectifying column 201a and measurement by the concentration measuring instrument, the b value of the high-concentration ammonia water in the first transition tank 202a is 90%, and the c value of the low-concentration ammonia water in the second transition tank 202b is 20%. The first switching valve 301a records the specific volume g flowing from the first transition tank 202a into the first holding tank 203a. Combining the ammonia water b and the volume g, the water volume required for the water tank 205 to convey to the first holding tank 203a is calculated. The water volume is controlled by controlling the first water valve 302a to keep the ammonia water concentration in the first holding tank 203a at 60%. The second switching valve 301b records the specific volume h flowing from the second transition tank 202b into the second holding tank 203b. Combining the ammonia water c and the volume h, the water volume required for the water tank 205 to convey to the second holding tank 203b is calculated. The water volume conveyed by the water tank 205 to the second holding tank 203b is controlled by controlling the second water valve 302b to keep the ammonia water concentration in the second holding tank at 10%.

[0064] Through the above control, the ammonia water concentration circulating in the power generation module 100 is realized.

[0065] The following Table 1 shows the Kalina cycle thermal efficiency at different turbine inlet pressures and ammonia water concentrations. The parameters in the left column of the table are the ammonia water concentrations, and the horizontal parameters are the turbine inlet pressures. The data area is the corresponding Kalina cycle thermal efficiency under the confirmation of ammonia water concentration and turbine inlet pressure. It can be seen from the chart that under the same working conditions, that is, at the same turbine inlet pressure, the thermal efficiency can be effectively improved by changing the ammonia water concentration.

[0066] The change process and change amount of the ammonia water concentration in the Kalina cycle system are determined by specific working conditions. In the Kalina cycle, the heat source temperature, cold source temperature, evaporator inlet flow rate, turbine inlet pressure, ammonia water concentration, etc. all affect the thermal efficiency of the entire system and are related to each other. Specifically, through the correlation function, according to specific working condition parameters, the ammonia water concentration value is adjusted. For example, under the condition that other working conditions remain unchanged, usually, the system working conditions are not actively changed by humans (except for the flow rate). If a variable concentration system is set, taking the working fluid concentration as an artificial influencing factor, when the inlet pressure is determined, reducing the ammonia water concentration ratio can significantly improve the thermal efficiency of the Kalina cycle system compared with the previous thermal efficiency.

[0067] Table 1 Kalina cycle efficiency at different turbine inlet pressures and ammonia water concentrations.

[0068] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (e.g., changes in the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the positions of the elements may be inverted or otherwise changed, and the nature, number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or re-ordered according to alternative embodiments. In the claims, any "means-plus-function" clauses are intended to cover the structures that perform the recited functions herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the present invention is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0069] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the present invention or those features that are not relevant to the implementation of the present invention).

[0070] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, manufacturing and production.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention may be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A Kalina cycle power generation system with variable working medium, characterized in that: including, a power generation module (100), including an expansion generator (101), a condenser (102), a working fluid pump (103), an evaporator (104), a check valve (105) and a concentration measuring instrument (106), wherein the expansion generator (101) is connected to the condenser (102) and the evaporator (104), the check valve (105) is connected to the condenser (102) and the working fluid pump (103), and the concentration measuring instrument (106) is connected to the working fluid pump (103) and the evaporator (104); a working fluid changing module (200), which is connected to both ends of the check valve (105); the working fluid changing module (200) includes a rectifying component (201), a transition component (202), a working fluid tank (203) and a regulating pump (204), the transition component (202) is arranged between the rectifying component (201) and the working fluid tank (203), and the regulating pump (204) is connected to the working fluid tank (203) and the check valve (105); the regulating pump (204) includes an outlet (204a), a first inlet (204b) and a second inlet (204c), the first inlet (204b) and the second inlet (204c) are arranged above the regulating pump (204), and the outlet (204a) is arranged below the regulating pump (204); the working fluid tank (203) includes a first accommodating tank (203a) and a second accommodating tank (203b), the first accommodating tank (203a) is connected to the first inlet (204b), and the second accommodating tank (203b) is connected to the second inlet (204c); control valves are arranged at the connection points of the working fluid changing module (200) with the condenser (102) and the working fluid pump (103). If ammonia water enters the working fluid pump (103) from the check valve (105), the ammonia water does not enter the working fluid changing module (200) for proportional regulation; concentration measuring instruments are arranged between the heat exchanger (201b) and the first transition tank (202a) and between the reboiler (201c) and the second transition tank (202b) to monitor the actual concentration value in real time; the regulating pump (204) further includes a first internal cavity (204d), a second internal cavity (204e) and a mixing cavity (204f). The first inlet (204b) is communicated with the first internal cavity (204d), the second inlet (204c) is communicated with the second internal cavity (204e), the first internal cavity (204d) is communicated with the mixing cavity (204f) through a first valve port (204d-1), the second internal cavity (204e) is communicated with the mixing cavity (204f) through a second valve port (204e-1), controllable valves are arranged at the first valve port (204d-1) and the second valve port (204e-1), and after the two controllable valves are opened, the flow rates per unit time are the same, and the total amount of the mixed solution input is calculated according to the opening time.

2. The Kalina cycle power generation system with variable working medium according to claim 1, characterized in that: The transition member (202) includes a first transition tank (202a) and a second transition tank (202b). The first transition tank (202a) is connected to the first accommodation tank (203a), and the second transition tank (202b) is connected to the second accommodation tank (203b).

3. The Kalina cycle power generation system with variable working medium according to claim 2, characterized in that: The rectifying member (201) includes a rectifying column (201a), a heat exchanger (201b), and a reboiler (201c). The heat exchanger (201b) connects the rectifying column (201a) and the first transition tank (202a), and the reboiler (201c) connects the rectifying column (201a) and the second transition tank (202b).

4. The Kalina cycle power generation system with variable working medium according to claim 3, characterized in that: Further included is a control module (300), which includes a switching member (301), a water control valve (302), a liquid mixing member (303), a data acquisition member (304), and an arithmetic member (305). The switching member (301) is disposed on the rectifying column (201a), the water control valve (302) is disposed on the transition member (202), and the liquid mixing member (303) is disposed on the regulating pump (204). The arithmetic member (305) is connected to the data acquisition member (304), and the data acquisition member (304) is connected to the switching member (301), the water control valve (302), and the liquid mixing member (303).

5. The Kalina cycle power generation system with variable working fluid according to claim 4, characterized in that: The switching member (301) includes a first switching valve (301a) and a second switching valve (301b). The first switching valve (301a) is disposed between the first transition tank (202a) and the first accommodation tank (203a), and the second switching valve (301b) is disposed between the second transition tank (202b) and the second accommodation tank (203b).

6. The Kalina cycle power generation system with variable working medium according to claim 5, characterized in that: The liquid mixing member (303) includes a first control valve (303a) and a second control valve (303b). The first control valve (303a) is disposed between the first accommodation tank (203a) and the first liquid inlet (204b), and the second control valve (303b) is disposed between the second accommodation tank (203b) and the second liquid inlet (204c).

7. The Kalina cycle power generation system with variable working medium according to claim 5 or 6, characterized in that: The variable working fluid module (200) further includes a water tank (205), and the water control valve (302) includes a first water saving valve (302a) and a second water saving valve (302b). The first water saving valve (302a) connects the water tank (205) and the first accommodation tank (203a), and the second water saving valve (302b) connects the water tank (205) and the second accommodation tank (203b).

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