Component-adjustable liquid storage device and ORC system

Abstract

The invention discloses a component-adjustable liquid storage device which comprises a shell, at least two liquid storage areas are arranged in the shell and respectively adapt to working media at different temperatures, and each liquid storage area is provided with a working medium inlet and a working medium outlet; a mixed working medium storage area communicated with each liquid storage area is also arranged in the shell and is used for adjusting and mixing working media with different temperatures; a working medium separating device is arranged in the mixed working medium storage area, and the separated working medium is recycled into the corresponding liquid storage area. The invention further discloses an ORC system with the component-adjustable liquid storage device, the organic working medium in the component-adjustable liquid storage device is pumped to the evaporator through the working medium pump and exchanges heat with a low-temperature heat source, the heated organic working medium pushes the expansion machine to do work, the expanded organic working medium enters the condenser, and the condenser is used for condensing the organic working medium. And the mixed working medium is conveyed to different liquid storage areas or mixed working medium storage areas in the component-adjustable liquid storage device through the shunting pipeline. Storage of working media in high, medium and low temperature intervals can be achieved, and the problem that the utilization of a single ORC working medium interval is limited is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-temperature waste heat recovery, and in particular relates to a component-adjustable liquid storage device suitable for an ORC system and an ORC system with the component-adjustable liquid storage device. Background Art

[0002] Organic Rankine Cycle (ORC) technology has become a hot topic of research due to its outstanding potential in waste heat recovery. However, in actual operation, the waste heat recovery efficiency of ORC systems is often affected by factors such as temperature fluctuations of the cold and heat sources and changes in the physical properties of the working fluid. When operating conditions deviate from the designed operating conditions, the system's thermodynamic cycle parameters will change significantly, which may lead to varying degrees of decline in overall operating performance. How to maintain the efficient operation of ORC systems under variable operating conditions has become a major issue that needs to be addressed in this field.

[0003] In the prior art, the invention patent (CN115559793A) discloses an adjustable non-azeotropic mixed working fluid ORC system, which mainly includes a steam evaporator, a liquid condenser, a low-boiling point and high-boiling point working fluid expander, a low-boiling point and high-boiling point working fluid storage tank, a low-boiling point and high-boiling point working fluid condenser, a low-boiling point and high-boiling point working fluid pump, a low-boiling point and high-boiling point working fluid throttle valve, a low-boiling point and high-boiling point working fluid three-way valve and a mixer. The system can meet the different optimal component requirements of the evaporation process and the condensation process, so that the temperature glide of the working fluid can be better matched with the heat source and the cold source to reduce the irreversible loss in the heat transfer process and effectively improve the system performance under variable working conditions. The invention only describes the system operation at the system level and does not modify the working fluid storage tank.

[0004] The invention patent (CN116242068A) discloses a non-condensable gas separation system based on an ORC power generation device. The system includes an ORC power generation device, which is composed of a working fluid pump, an evaporator, a turbine generator, and a condenser. The working fluid pump, the evaporator, the turbine generator, and the condenser are sequentially connected end-to-end via corresponding pipelines. The system also includes a non-condensable gas separation system that separates non-condensable gases from the ORC power generation device. The non-condensable gas separation system is connected to the condenser. This invented device reduces the operating cost of the equipment by recovering organic working fluids from the exhaust steam, but the operating cost of this system is not adjustable.

[0005] The invention patent (CN115324672A) provides a low-grade waste heat ORC power generation system with an online exhaust device. The system includes an expansion turbine for completing the four processes of the organic Rankine cycle (expansion, condensation, compression, and heating), a condenser, a working fluid booster pump, a preheating evaporator, and a generator for converting the mechanical energy generated by the expansion work into electrical energy. The system also includes an organic working fluid exhaust device connected to the top of the condenser to promptly exhaust non-condensable gases generated during the operation of the power generation system, thereby significantly reducing the exhaust pressure of the expansion turbine and the power consumption of the cooling circulation water pump, thereby improving the power generation efficiency of the ORC power generation system. In addition, the embodiments of the present invention can also recover liquefied organic working fluid, reducing gaseous organic working fluid emissions, further achieving energy conservation and emission reduction.

[0006] The invention patent (CN114396732B) discloses a mixed-refrigerant-based, component-separated ORC-coupled VCR system. The system includes a mixed refrigerant as the circulating refrigerant. The system comprises a steam generator, an expander, a component separation and condensing unit, a refrigerant pump, a throttle valve, a refrigeration evaporator, and a compressor. Industrial waste heat is used to drive the phase-change evaporator in the ORC system.

[0007] Existing ORC single-liquid storage devices can only store a single working fluid, with non-adjustable composition and a narrow range for waste heat recovery. Furthermore, when the heat source temperature fluctuates, the working fluid cannot properly match the heat source, resulting in low energy efficiency. Furthermore, the long-term operation of a single storage tank can lead to the presence of non-condensable gases and the carryover of small amounts of lubricating oil from the oil pump into the storage device, seriously impacting operational safety. Summary of the Invention

[0008] The present invention provides a component-adjustable liquid storage device, which solves the problem that the existing single organic working fluid cannot match the changes of cold and heat sources, resulting in low waste heat recovery efficiency.

[0009] A component-adjustable liquid storage device comprises a housing, wherein at least two liquid storage areas are provided in the housing, each of which is adapted to working fluids of different temperatures, and each liquid storage area is provided with a working fluid inlet and a working fluid outlet;

[0010] The shell also includes a mixed working medium storage area connected to each liquid storage area, which is used for regulating and mixing working mediums of different temperatures; a working medium separation device is provided in the mixed working medium storage area, and the separated working medium is recovered to the corresponding liquid storage area.

[0011] Compared to a single liquid storage device, the component-adjustable liquid storage device of this application is equipped with multiple storage areas, enabling separate storage of working fluids in different temperature ranges, addressing the limited utilization of a single ORC working fluid range. Furthermore, the independent mixed working fluid storage area allows for the mixing of multiple working fluids, reducing irreversible heat losses during the heat exchange process.

[0012] Preferably, a working fluid replenishment area is provided in the housing, connected to each liquid storage area, for replenishing the working fluid loss during operation. That is, a corresponding replenishment area is provided in each liquid storage area to replenish the working fluid shortage caused by leakage or other reasons in a timely manner during operation, thereby ensuring the stability and sustainability of the system operation.

[0013] Preferably, the liquid storage area includes a low-temperature working fluid storage area, a medium-temperature working fluid storage area and a high-temperature working fluid storage area. The low-temperature working fluid storage area is provided with a low-temperature working fluid inlet and a low-temperature working fluid outlet, the medium-temperature working fluid storage area is provided with a medium-temperature working fluid inlet and a medium-temperature working fluid outlet, and the high-temperature working fluid storage area has a high-temperature working fluid inlet and a high-temperature working fluid outlet.

[0014] There are three liquid storage areas in the present application, including a low-temperature working fluid storage area, a medium-temperature working fluid storage area and a high-temperature working fluid storage area, which correspond to working fluids at different temperatures respectively; the number of liquid storage areas can also be further increased, that is, the liquid storage areas include but are not limited to the above-mentioned low-temperature, medium-temperature and high-temperature storage areas.

[0015] Preferably, a low-temperature working fluid partition plate is installed in the low-temperature working fluid storage area, which is divided into a low-temperature working fluid recovery area and a non-condensable gas discharge area through the low-temperature working fluid partition plate; the low-temperature working fluid storage area is provided with a low-temperature working fluid exhaust valve for discharging non-condensable gases and a condensation area exhaust valve; the low-temperature working fluid storage area is provided with a condensing heat exchanger for recovering the working fluid in the exhaust process.

[0016] During the long-term operation of a single storage tank, non-condensable gas will exist in the tank and a small amount of lubricating oil will be carried into the liquid storage device during the operation of the lubricating oil pump, which will seriously affect the operation safety. Therefore, a special lubricating oil discharge and non-condensable gas discharge device is set up.

[0017] Preferably, a low-temperature working fluid mixing zone channel and a mixing zone return condensing zone channel are provided between the low-temperature working fluid storage zone and the mixed working fluid storage zone. The low-temperature working fluid enters the mixed working fluid storage zone through the low-temperature working fluid mixing zone channel. After the low-temperature working fluid in the mixed working fluid storage zone is vaporized, it is recovered to the condensing zone of the low-temperature working fluid storage zone through the mixing zone return condensing zone channel.

[0018] Preferably, a medium-temperature working fluid inlet into the mixing zone and a medium-temperature liquid outlet in the mixing zone are provided between the medium-temperature working fluid storage zone and the mixed working fluid storage zone. The medium-temperature working fluid enters the mixed working fluid storage zone through the medium-temperature working fluid inlet into the mixing zone. After the medium-temperature working fluid in the mixed working fluid storage zone is vaporized, it is condensed and recovered to the medium-temperature working fluid storage zone through the medium-temperature liquid outlet in the mixing zone.

[0019] Preferably, a high-temperature working fluid inlet channel and a high-temperature working fluid outlet channel are provided between the high-temperature working fluid storage area and the mixed working fluid storage area. The high-temperature working fluid enters the mixed working fluid storage area through the high-temperature working fluid inlet channel, and the high-temperature working fluid in the mixed working fluid storage area returns to the high-temperature working fluid storage area through the high-temperature working fluid outlet channel.

[0020] Preferably, a high-temperature working fluid condensation heat exchanger is installed in the high-temperature working fluid storage area for condensing and recovering the high-temperature working fluid.

[0021] Preferably, a working medium uniformity device for mixing working mediums of different temperatures is provided in the mixed working medium storage area.

[0022] The present application also provides an ORC system with a component-adjustable liquid storage device, comprising a working fluid pump, an evaporator, an expander, a condenser, and the above-mentioned component-adjustable liquid storage device;

[0023] The organic working fluid in the component-adjustable liquid storage device is pumped to the evaporator by a working fluid pump, and exchanges heat with a low-temperature heat source. The heated organic working fluid is converted into a high-temperature and high-pressure gas, which drives the expander to do work. The expanded organic working fluid enters the condenser and is transported to different liquid storage areas or mixed working fluid storage areas in the component-adjustable liquid storage device through a diversion pipeline.

[0024] Compared with the prior art, the present invention has the following innovations and beneficial effects:

[0025] Compared with a single liquid storage device, the device of the present invention can obviously realize the storage of working fluids in different temperature ranges of high, medium and low, solving the problem of limited utilization of a single ORC working fluid range;

[0026] The device of the present invention is designed with a special working fluid mixing zone, which can achieve the ratio of multiple working fluids. The mixed working fluid zone can achieve better matching between the working fluid and the heat source and the cold source, further reducing the irreversible heat loss in the heat exchange process of the heat exchanger;

[0027] The component-adjustable liquid storage device of the present application can achieve cascade utilization of low-temperature waste heat by adjusting different working fluid components. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural diagram of the ORC system in this application;

[0029] In the figure: working fluid pump 1, heat source inlet 2, heat source outlet 3, evaporator 4, expander 5, cold source inlet 6, cold source outlet 7, condenser 8, diversion pipe 9, working fluid storage tank 10, exhaust valve 11, low-temperature working fluid supply area 12, medium-temperature working fluid supply area 13, high-temperature working fluid supply area 14, working fluid tank outlet area 15, heat source temperature detection 16, low-temperature working fluid condensate 17, medium-temperature working fluid condensate 18, low-temperature working fluid area 19, medium-temperature working fluid area 20, high-temperature working fluid area 21, working fluid mixing area 22, heat source inlet extraction 23, heat source outlet extraction 24 and exhaust steam extraction 25;

[0030] Figure 2 It is a structural diagram of a component-adjustable liquid storage device;

[0031] In the figure: low-temperature working medium inlet 10-1, low-temperature working medium outlet 10-2, medium-temperature working medium inlet 10-3, medium-temperature working medium outlet 10-4, high-temperature working medium inlet 10-5, high-temperature working medium outlet 10-6, mixed working medium separation zone working medium heat source inlet 10-7, mixed working medium separation zone heat source outlet 10-8, medium-temperature zone condensate inlet 10-19, medium-temperature zone condensate outlet 10-20, mixed working medium inlet channel 10-33 and mixed working medium outlet channel 10-34;

[0032] Figure 3 This is a diagram showing the internal partitions of the component-adjustable liquid storage device;

[0033] In the figure: condensing heat exchanger 10-9, low temperature working medium exhaust valve 10-10, condensing area exhaust valve 10-11, low temperature working medium storage area 10-12, mixing area back to condensing area channel 10-14, condensing area 10-15, low temperature working medium into mixing area channel 10-13 and 10-16, condensing area into low temperature working medium storage area 10-17, mixing area outlet 10-18, medium temperature area condensate inlet 10-19, medium temperature area condensate outlet 1 0-20, medium-temperature working fluid storage area 10-21, mixed working fluid storage area 10-22, working fluid separation device 10-23, working fluid uniformization device 10-24, high-temperature working fluid inlet channel 10-25, high-temperature working fluid outlet channel 10-26, high-temperature working fluid condensation area 10-27, high-temperature working fluid exhaust valve 10-28, high-temperature working fluid recovery area 10-29, high-temperature working fluid storage area 10-30 and high-temperature working fluid recovery area inlet 10-31. DETAILED DESCRIPTION

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The ORC system in this embodiment is as follows Figure 1 As shown, the main components include a working fluid pump 1, a heat source inlet 2, a heat source outlet 3, an evaporator 4, an expander 5, a cold source inlet 6, a cold source outlet 7, a condenser 8, a diversion pipe 9, a working fluid storage tank 10, an exhaust valve 11, a low-temperature working fluid supply area 12, a medium-temperature working fluid supply area 13, a high-temperature working fluid supply area 14, a working fluid tank outlet area 15, a heat source temperature detection 16, a low-temperature working fluid condensate 17, a medium-temperature working fluid condensate 18, a low-temperature working fluid area 19, a medium-temperature working fluid area 20, a high-temperature working fluid area 21, a working fluid mixing area 22, a heat source inlet extraction 23, a heat source outlet extraction 24 and an exhaust steam extraction 25.

[0039] The organic working fluid is pumped into evaporator 4 via a working fluid pump. After exchanging heat with evaporator 4, low-temperature heat source 2 flows out through 3. After pushing expander 5 to perform work, the organic working fluid enters condenser 8 and then flows into diversion pipe 9. It can then sequentially enter different working fluid storage areas in different storage tanks, such as low-temperature working fluid area 19, medium-temperature working fluid area 20, high-temperature working fluid area 21, and working fluid mixing area 22. It then flows out through 15 and enters the next cycle. To prevent working fluid loss, the storage tank is equipped with a low-temperature working fluid replenishment area 12, a medium-temperature working fluid replenishment area 13, and a high-temperature working fluid replenishment area 14.

[0040] like Figure 1 and 2The component adjustable liquid storage device shown in the figure includes: a low-temperature working medium inlet 10-1, a low-temperature working medium outlet 10-2, a medium-temperature working medium inlet 10-3, a medium-temperature working medium outlet 10-4, a high-temperature working medium inlet 10-5, a high-temperature working medium outlet 10-6, a working medium heat source inlet 10-7 for the mixed working medium separation zone, a heat source outlet 10-8 for the mixed working medium separation zone, a condensing heat exchanger 10-9, a low-temperature working medium exhaust valve 10-10, a condensing zone exhaust valve 10-11, a low-temperature working medium storage zone 10-12, a low-temperature working medium inlet channel 10-13 for the mixed zone, a channel 10-14 for the mixed zone back to the condensing zone, a low-temperature working medium condensing zone 10-15, a low-temperature working medium inlet channel 10-16 for the mixed zone, and a low-temperature working medium storage zone. Liquid area 10-17, medium-temperature liquid outlet 10-18 of the mixing area, medium-temperature condensate inlet 10-19, medium-temperature condensate outlet 10-20, medium-temperature working fluid storage area 10-21, mixed working fluid storage area 10-22, working fluid separation device 10-23, working fluid uniformization device 10-24, high-temperature working fluid inlet channel 10-25, high-temperature working fluid outlet channel 10-26, heat exchanger 10-27, high-temperature working fluid exhaust valve 10-28, high-temperature working fluid recovery area 10-29, high-temperature working fluid storage area 10-30, high-temperature working fluid recovery area inlet 10-31, medium-temperature working fluid inlet into the mixing area 10-32, mixed working fluid inlet channel 10-33 and mixed working fluid outlet channel 10-34.

[0041] The working principle of the component adjustable liquid storage device in this embodiment is as follows:

[0042] The heat source 2 feeds back the temperature signal to the liquid storage device 10 in real time via the sensor device 23 , and the signal is also fed back to the diversion channel 9 at the same time.

[0043] When the monitored temperature is a low-temperature heat source, both the low-temperature working fluid inlet 10-1 and the low-temperature working fluid outlet 10-2 are open. The remaining working fluid channels are closed. The organic working fluid enters the low-temperature working fluid storage area 10-12 through the low-temperature working fluid inlet 10-1 and then flows out through the low-temperature working fluid outlet 10-2. Considering that working fluid may be lost during operation, a low-temperature working fluid replenishment area 12 is established. At the same time, the low-temperature working medium area 19 is layered and divided into a low-temperature working medium recovery area and a non-condensable gas drainage area via a low-temperature working medium partition plate. During actual operation of the organic working medium, the non-condensable gas generated will be discharged to the outside through the low-temperature working medium exhaust valve 10-10 and the condensation area exhaust valve 10-11. At the same time, to ensure the working medium during the recovery and exhaust process, a condensing heat exchanger 10-9 is added to the low-temperature working medium storage area 10-12. This heat exchanger adopts a spiral coil design, thereby increasing the heat exchange area and maximizing the use of the cold source. The source of the condensing heat exchanger 10-9 is mainly a stream of low-temperature working medium condensate 17 drawn from the condenser inlet for cooling. Lubricating oil and particulate impurities present during actual operation should be cleaned in a timely manner. Therefore, the low-temperature working medium storage area 10-12 can be drained to remove the oil and particulate impurities present in the low-temperature working medium area.

[0044] When the monitored temperature is a medium-temperature heat source, the medium-temperature working fluid inlet 10-3 and the medium-temperature working fluid outlet 10-4 are both open. The remaining working fluid channels are closed, and the organic working fluid enters the medium-temperature working fluid storage area 10-21 after passing through the medium-temperature working fluid inlet 10-3, and then flows out through the medium-temperature working fluid outlet 10-4. Considering that the working fluid may be lost during operation, a medium-temperature working fluid supply area 13 is set up. A mixed working fluid storage area 10-22 is set up in the medium-temperature area. When a single high-temperature working fluid, a medium-temperature working fluid, and a low-temperature working fluid cannot maximize the waste heat recovery efficiency of the system, the working fluid ratio of different components can be achieved through this area, and a mixed working fluid can be used to ensure the maximum waste heat utilization efficiency. The lubricating oil stains and particulate impurities present in the actual operation process can be removed by draining the medium-temperature working fluid storage area 12 and then removing the oil stains and particulate impurities present in the medium-temperature working fluid area.

[0045] When the monitored temperature is a high-temperature heat source, the high-temperature working fluid inlet 10-5 and the high-temperature working fluid outlet 10-6 are both opened. The remaining working fluid channels are closed, and the organic working fluid enters the high-temperature working fluid storage area 10-30 after passing through the high-temperature working fluid inlet 10-5, and then flows out through the high-temperature working fluid outlet 10-6. Considering that the working fluid may be lost during operation, a high-temperature working fluid supply area 14 is established, and a heat exchanger 10-27 is set up in this area. This area draws cooling water source 6 into the condenser to provide a cold source for the high-temperature working fluid recovery area 10-29. During operation, the non-condensable gas enters the discharge area and flows out through the high-temperature working fluid exhaust valve 10-28. The lubricating oil and particulate impurities present in the actual operation process can be removed by draining the medium and high working fluid storage area 14 and removing the oil and particulate impurities in the high-temperature working fluid area.

[0046] The mixed working fluid has temperature glide during the evaporation and condensation process, which can better match the temperature change of the heat source / cold source and reduce the irreversible loss of heat transfer. Compared with a single working fluid, the mixed working fluid maintains a higher efficiency by sliding the temperature when the heat source fluctuates. At the same time, by adjusting the mixing ratio, the working fluid at the expander outlet can be prevented from being over-humidified (such as adding high-boiling-point components), protecting the turbine equipment and improving reliability. The core advantage of the mixed working fluid is that it can achieve To minimize heat loss and optimize system performance, a special mixed working fluid storage area 10-22 is set up. This mixing area can achieve a mixed ratio of three different working fluids: high, medium and low temperatures. Compared with a single high, medium and low temperature working fluid, it can achieve a higher waste heat recovery efficiency and a wider range of waste heat recovery, while also realizing the separation and recovery of mixed working fluids.

[0047] When the high-temperature working fluid and the medium-temperature working fluid are mixed, the high-temperature working fluid enters the mixed working fluid storage area 10-22 through the high-temperature working fluid inlet channel 10-25, and the medium-temperature working fluid enters the mixed working fluid storage area 10-22 through the medium-temperature working fluid inlet 10-32. The proportioning of the working fluid mixing area 22 is completed according to the signal fed back by the monitoring device. The working fluid then enters the evaporator through the mixed working fluid outlet channel 10-34 to recover the low-temperature waste heat, and returns to the working fluid mixing area through the mixed working fluid inlet channel 10-33 after completing the expansion work. When the working fluid needs to be switched, the high and medium temperature working fluids in the mixed working fluid area need to be separated. When performing the working fluid separation, the main basis is the different boiling points of different working fluids. Therefore, different heat sources can be used to make the low-boiling-point working fluid vaporize first, while the high-boiling-point working fluid continues to remain in liquid form. The heat sources required for the separation of high and medium temperature working fluids are 23 and 24. The heat source passes through the mixed working medium separation zone working medium heat source inlet 10-7, exchanges heat with the organic working medium, and then vaporizes the medium-temperature working medium. It then enters the non-condensable gas separation zone through the mixed working medium outlet 10-18. After cooling, the working medium is recovered to the medium-temperature working medium storage zone 10-21. At this point, the high-temperature working medium is still in liquid form and returns to the bottom of the working medium through the high-temperature working medium outlet channel 10-26 for sufficient cooling. The non-condensable gas is separated through the high-temperature working medium exhaust valve 10-28, and the organic working medium then returns to the high-temperature working medium storage zone 10-30.

[0048] When the medium-temperature working fluid and the low-temperature working fluid are mixed, the medium-temperature working fluid enters the mixed working fluid storage area 10-22 through the medium-temperature working fluid mixing area inlet 10-32, and the low-temperature working fluid enters the mixed working fluid storage area 10-22 through the low-temperature working fluid mixing area channel 10-16. After the two are completely mixed by the working fluid uniformity device 10-24, the proportioning of the working fluid mixing area 22 is completed according to the signal fed back by the monitoring device. The working fluid then enters the evaporator through the mixed working fluid outlet channel 10-34 to recover the low-temperature waste heat, and after completing the expansion work, returns to the working fluid mixing area through the mixed working fluid inlet channel 10-33. When it is necessary to switch the working fluid, it is necessary to separate the medium and low temperature working fluids in the mixed working fluid area. At this time, the heat sources for the separation of the working fluids are 24 and 25.

[0049] By mixing the outlet temperature 24 of the low-temperature heat source entering the evaporator and the expanded exhaust steam temperature 25, the mixed working fluid separation zone working fluid inlet 10-7 exchanges heat with the organic working fluid, and the low-temperature working fluid vaporizes and returns to the low-temperature working fluid condensation zone 10-15 through the mixed zone return channel 10-14, and is fully condensed through the heat exchanger 10-9, and then the non-condensable gas is discharged and returned to the bottom of the low-temperature working fluid storage area.

[0050] The specific work of the new liquid storage device applied to the ORC system is as follows:

[0051] The organic working fluid is pumped into the evaporator 4 by the working fluid pump in the ORC system, exchanges heat with the low-temperature heat source (heat source inlet 2), and flows out from the evaporator outlet (heat source outlet 3). The heated organic working fluid is converted into high-temperature and high-pressure gas, which drives the expander 5 to work to realize energy conversion. Subsequently, the expanded organic working fluid enters the condenser 8, releases heat during the condensation process, is converted into liquid, and is transported to different storage tank areas through the shunt pipe 9 for classified storage. Specifically, the working fluid can enter the low-temperature working fluid area 19, the medium-temperature working fluid area 20, the high-temperature working fluid area 21, or the working fluid mixing area 22 according to the differences in temperature and composition. The mixing area has a control function and can separate and combine working fluids of different components to optimize system performance. The heat source required for separation and mixing comes from the heat source inlet extraction 23, the heat source outlet extraction 24, and the exhaust steam extraction 25, and the cold source is mainly provided by the cooling medium at the condenser inlet. The separated and stored working fluid reenters the cycle through the outlet pipe 15 to ensure continuous and efficient operation of the system. In addition, to avoid working fluid loss, corresponding replenishment areas are provided in each liquid storage tank, including the low-temperature working fluid replenishment area 12, the medium-temperature working fluid replenishment area 13, and the high-temperature working fluid replenishment area 14, to replenish the working fluid shortage caused by leakage or other reasons in the running process, and to ensure the stability and sustainability of the system.

[0052] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A component-adjustable liquid storage device, comprising a housing, characterized in that: At least two liquid storage areas are provided in the shell, each of which is adapted to working fluids of different temperatures, and each liquid storage area is provided with a working fluid inlet and a working fluid outlet; The shell also includes a mixed working medium storage area connected to each liquid storage area for regulating and mixing working mediums at different temperatures; a working medium separation device is provided in the mixed working medium storage area, and the separated working medium is recovered to the corresponding liquid storage area.

2. The component-adjustable liquid storage device according to claim 1, characterized in that: A working fluid supply area correspondingly connected to each liquid storage area is provided in the shell to replenish the loss of working fluid during operation.

3. The component-adjustable liquid storage device according to claim 1, characterized in that: The liquid storage area includes a low-temperature working fluid storage area, a medium-temperature working fluid storage area and a high-temperature working fluid storage area. The low-temperature working fluid storage area is provided with a low-temperature working fluid inlet and a low-temperature working fluid outlet, the medium-temperature working fluid storage area is provided with a medium-temperature working fluid inlet and a medium-temperature working fluid outlet, and the high-temperature working fluid storage area corresponds to a high-temperature working fluid inlet and a high-temperature working fluid outlet.

4. The component-adjustable liquid storage device according to claim 3, characterized in that: A low-temperature working fluid partition plate is installed in the low-temperature working fluid storage area, which is divided into a low-temperature working fluid recovery area and a non-condensable gas discharge area through the low-temperature working fluid partition plate; the low-temperature working fluid storage area is provided with a low-temperature working fluid exhaust valve and a condensation area exhaust valve for discharging non-condensable gases; the low-temperature working fluid storage area is provided with a condensing heat exchanger for recovering the working fluid in the exhaust process.

5. The component-adjustable liquid storage device according to claim 4, characterized in that: A low-temperature working fluid mixing zone channel and a mixing zone return condensing zone channel are provided between the low-temperature working fluid storage zone and the mixed working fluid storage zone. The low-temperature working fluid enters the mixed working fluid storage zone through the low-temperature working fluid mixing zone channel. After the low-temperature working fluid in the mixed working fluid storage zone is vaporized, it is recovered to the condensing zone of the low-temperature working fluid storage zone through the mixing zone return condensing zone channel.

6. The component-adjustable liquid storage device according to claim 3, characterized in that: A medium-temperature working medium inlet into the mixing zone and a medium-temperature liquid outlet in the mixing zone are provided between the medium-temperature working medium storage zone and the mixed working medium storage zone. The medium-temperature working medium enters the mixed working medium storage zone through the medium-temperature working medium inlet into the mixing zone. After the medium-temperature working medium in the mixed working medium storage zone is vaporized, it is condensed and recovered to the medium-temperature working medium storage zone through the medium-temperature liquid outlet in the mixing zone.

7. The component-adjustable liquid storage device according to claim 3, characterized in that: A high-temperature working medium inlet channel and a high-temperature working medium outlet channel are provided between the high-temperature working medium storage area and the mixed working medium storage area. The high-temperature working medium enters the mixed working medium storage area through the high-temperature working medium inlet channel, and the high-temperature working medium in the mixed working medium storage area returns to the high-temperature working medium storage area through the high-temperature working medium outlet channel.

8. The component-adjustable liquid storage device according to claim 7, characterized in that: A high-temperature working fluid condensation heat exchanger is installed in the high-temperature working fluid storage area for condensing and recovering the high-temperature working fluid.

9. The component-adjustable liquid storage device according to claim 1, characterized in that: The mixed working medium storage area is provided with a working medium uniformity device for mixing working mediums of different temperatures.

10. An ORC system with a composition-adjustable liquid storage device, characterized in that: It comprises a working fluid pump, an evaporator, an expander, a condenser and the component-adjustable liquid storage device according to any one of claims 1 to 9; The organic working fluid in the component-adjustable liquid storage device is pumped to the evaporator by a working fluid pump, and exchanges heat with a low-temperature heat source. The heated organic working fluid is converted into a high-temperature and high-pressure gas, which drives the expander to do work. The expanded organic working fluid enters the condenser and is transported to different liquid storage areas or mixed working fluid storage areas in the component-adjustable liquid storage device through a diversion pipeline.

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