A working medium gas-liquid separation device for a waste heat power generation system

Abstract

This invention discloses a gas-liquid separation device for a waste heat power generation system, relating to low-temperature flue gas waste heat power generation. It solves the problems of low separation accuracy, poor stability, unreasonable structural layout, and inability to guarantee the safe operation of the expander in existing technologies. The key technical points are: a gas-liquid separation tank, with a gas-liquid working fluid inlet pipe connected to the outside of the tank, and a gas phase outlet pipe connected to the top of the tank. This invention employs a multi-stage gradient baffle separation and multi-layer precision filtration composite structure. Multi-stage baffle sedimentation separation is achieved through at least four axially evenly distributed gas-liquid separation components within the tank. Combined with the top gas phase fine filtration component, primary filtration, defoaming and foam breaking, and precision filtration are completed for three-stage deep liquid removal. This deeply purifies the liquid-containing mixed working fluid output from the evaporator, ultimately ensuring that the liquid phase ratio of the outlet gas phase working fluid is ≤0.5%, fully meeting the drying operation conditions of the waste heat power generation expander.

Description

Technical Field

[0001] This invention relates to the field of low-temperature flue gas waste heat power generation technology, and in particular to a working fluid gas-liquid separation device for a waste heat power generation system. Background Technology

[0002] In low-temperature flue gas waste heat power generation systems, the low-temperature flue gas waste heat has a low energy level and a small heat exchange temperature difference. The organic working fluid cannot achieve complete phase change evaporation inside the evaporator, resulting in the working fluid at the evaporator outlet generally exhibiting a mixed state of gas and liquid coexisting. This inevitably leads to problems such as liquid carryover in the working fluid and a high liquid content. The measured liquid phase ratio of the original outlet working fluid can reach up to about 10%. During system operation, if this liquid-containing mixed working fluid is directly fed into the expander at high speed without effective and refined gas-liquid separation treatment, a large number of liquid micro-droplets carried in the mixed working fluid will impact and scour the expander impeller, flow channel, and sealing structure with the high-speed airflow. Over long-term operation, this will cause failures such as impeller wear, surface cavitation, and blade deformation, which will lead to increased vibration of the expander, continuous decline in working efficiency, and unstable output power. In severe cases, it will cause damage to the internal components of the expander and unit shutdown failures, significantly shortening the service life of the core equipment of the expander, greatly reducing the operational stability, safety, and waste heat recovery efficiency of the entire low-temperature flue gas waste heat power generation system, and restricting the engineering application effect of low-temperature waste heat power generation technology.

[0003] Currently, most traditional working fluid gas-liquid separation devices in the industry only adopt a single gravity sedimentation structure or a single-layer simple baffle separation structure. The separation principle is simple and the separation layers are few. They can only perform preliminary sedimentation separation of larger droplets in the mixed working fluid. They have extremely poor ability to capture and remove micron-sized fine suspended droplets and foam-like droplets, and cannot achieve fine and deep liquid removal. After treatment, the gas phase working fluid of traditional equipment still has a high liquid phase residue. The measured proportion of liquid phase in the original outlet working fluid can be as high as about 10%. The dryness of the outlet gas phase is difficult to meet the stringent operating conditions of long-term, continuous and dry operation of the expander. Summary of the Invention

[0004] To address the above shortcomings, this invention provides a working fluid gas-liquid separation device for waste heat power generation systems, which can achieve high-precision gas-liquid separation, effective removal of fine droplets, strong equipment structural stability, compliant outlet working fluid dryness, and is not easily damaged by the expander.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a gas-liquid separation tank, wherein a gas-liquid working fluid inlet main pipe is connected to the outside of the gas-liquid separation tank, a gas phase outlet main pipe is connected to the top of the gas-liquid separation tank, and a liquid phase outlet main pipe is connected to the bottom of the gas-liquid separation tank. A flow-limiting and guiding baffle is provided on the inner side of the gas-liquid separation tank corresponding to the inlet of the gas-liquid working fluid inlet main pipe. The flow-limiting and guiding baffle is a semi-open flow guiding structure. The flow-limiting and guiding baffle is fixed to the inner side of the inlet end of the gas-liquid working fluid inlet main pipe, and the opening of the flow-limiting and guiding baffle is set towards the liquid phase outlet direction inside the tank. No less than four sets of gas-liquid separation components are arranged from top to bottom inside the gas-liquid separation tank. The multiple sets of gas-liquid separation components are evenly arranged along the axial direction of the tank and symmetrically distributed on the upper and lower sides of the flow-limiting and guiding baffle to realize multi-stage gradient gas-liquid separation. A gas phase fine filtration component is provided on the top of the inner wall of the gas-liquid separation tank.

[0006] In one embodiment, the gas-liquid separation tank is the main pressure-bearing shell of the device, and the inner side wall of the gas-liquid separation tank is provided with mounting slots for component assembly and positioning.

[0007] In one embodiment, a gas phase pressure regulating valve and a working fluid inlet connecting pipe are sequentially provided at the end of the gas-liquid working fluid feed main pipe away from the gas-liquid separator. The working fluid inlet connecting pipe is connected to the side feed end of the gas-liquid separator through the gas-liquid working fluid feed main pipe and is used to input the gas-liquid mixed working fluid output by the evaporator into the gas-liquid separator.

[0008] In one embodiment, a second gas phase pressure regulating valve and a gas phase outlet connecting pipe are sequentially provided at the end of the gas phase outlet main pipe away from the gas-liquid separation tank. The gas phase outlet connecting pipe is connected in series with the second gas phase pressure regulating valve through the gas phase outlet main pipe. The gas phase outlet main pipe is used to export qualified gas phase working fluid with a liquid phase ratio ≤.% after separation and fine filtration, which meets the drying requirements for the expansion machine operation, through the gas phase outlet connecting pipe.

[0009] In one embodiment, a liquid phase regulating valve and a liquid phase outlet connecting pipe are sequentially provided at the end of the liquid phase outlet main pipe away from the gas-liquid separation tank. The liquid phase outlet connecting pipe is connected in series with the liquid phase regulating valve through the liquid phase outlet main pipe, which is used to smoothly flow the separated liquid working medium to the external pipeline, ensuring the continuous and stable operation of the overall gas-liquid separation of the device.

[0010] In one embodiment, the gas-liquid separation assembly includes an umbrella-shaped baffle plate, a flow perforation, and a separation plate fixing support rod. The umbrella-shaped baffle plate is fixedly installed inside the tank by the separation plate fixing support rod.

[0011] In one embodiment, the umbrella-shaped flow separation plate is arranged in an inverted umbrella shape, and the outer ring of the umbrella-shaped flow separation plate is provided with flow perforations at equal intervals, and the diameter of the flow perforations increases uniformly from the center to the outer edge.

[0012] In one embodiment, the gas phase fine filtration assembly includes a fixed sleeve, a lower limit fixed retaining ring, an upper limit fixed retaining ring, a primary filter screen, an antifoaming wire mesh, and a gas phase filter perforated plate. The inner wall of the gas-liquid separation tank is provided with a built-in limiting block on the side near the gas phase outlet main pipe, and the fixed sleeve is engaged with the top of the inner wall of the gas-liquid separation tank through the built-in limiting block.

[0013] In one embodiment, the upper and lower ends of the inner side of the fixed sleeve are respectively provided with an upper limit fixing ring and a lower limit fixing ring. The upper limit fixing ring and the lower limit fixing ring are welded and fixed to the inner wall of the fixed sleeve. The upper limit fixing ring and the lower limit fixing ring form a closed limiting installation cavity to axially limit and fix the internal filter component, preventing the filter component from axially moving or shifting.

[0014] In one embodiment, the primary filter screen, defoaming mesh, and gas phase filter perforated plate are nested and assembled sequentially from bottom to top in the limiting installation cavity inside the fixed sleeve, and the three are arranged in parallel and tightly fitted to each other. The primary filter screen is arranged on the side closer to the gas-liquid separation component, and the gas phase filter perforated plate is arranged on the side closer to the gas phase outlet main pipe, so that the rising gas phase working fluid passes through primary filtration, defoaming and liquid removal, and precision filtration in sequence, removing fine droplets step by step, and ensuring that the dryness of the outlet gas phase working fluid meets the standard.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts a multi-stage gradient baffle separation and multi-layer precision filtration composite structure. It achieves multi-stage baffle sedimentation separation through no less than four sets of axially evenly distributed gas-liquid separation components in the tank. Combined with the top gas phase fine filtration component, it completes three-stage deep liquid removal: primary filtration, defoaming and foam breaking, and precision filtration. This can deeply purify the liquid-containing mixed working fluid output from the evaporator, and ultimately ensure that the liquid phase ratio of the outlet gas phase working fluid is ≤0.5%. This fully meets the drying operation conditions of the waste heat power generation expander, solves the problem of liquid working fluid impacting and wearing the expander, and greatly improves the service life of the equipment and the stability of system operation. 2. The present invention is equipped with a semi-open flow-limiting and guiding baffle with the opening facing the liquid phase outlet direction. It can stabilize, limit and guide the flow of the feed gas-liquid mixture, so that the mixture forms a stable swirling flow field in the tank. It uses centrifugal force and gravity to achieve pre-separation of large droplets, avoids the problem of reduced separation efficiency caused by feed deviation and airflow turbulence, and improves the overall separation uniformity. 3. This invention adopts a multi-stage gradient separation flow field structure with a first downward guide, then a reversal, and upper and lower layers. The feed mixture is forced to flow downward through the flow-limiting guide baffle, which first completes the primary flow separation of the lower gas-liquid separation component. Then, the pressure difference inside the tank is used to make the working medium reversal upward, and completes multi-stage deep separation through multiple sets of upper gas-liquid separation components. This completely changes the defects of the straight-through short-path flow field of traditional equipment. With the inverted umbrella-shaped baffle structure and the outer edge gradient aperture flow perforation, the disturbance, collision and sedimentation path of the working medium is greatly extended, and a complete gradient layered separation system is constructed. This greatly improves the ability to capture fine droplets and can stably adapt to high liquid content feed conditions with a maximum liquid content of 10% at the evaporator outlet. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 A schematic diagram of the overall three-dimensional structure of the working fluid gas-liquid separation device for a waste heat power generation system; Figure 2 A schematic diagram of the internal structure of the gas-liquid separation tank of a working fluid gas-liquid separation device for a waste heat power generation system. Figure 3 Working fluid gas-liquid separation device for waste heat power generation system Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 A half-section diagram of the gas-liquid working fluid feed pipe and the gas-liquid separation tank of the working fluid gas-liquid separation device for waste heat power generation system. Figure 5 A schematic diagram of the gas-liquid separation component structure of a working fluid gas-liquid separation device for a waste heat power generation system; Figure 6 A schematic diagram of the connection structure between the liquid phase outlet main pipe and the liquid phase outlet connecting pipe of the working fluid gas-liquid separation device for waste heat power generation system.

[0018] The attached figures are labeled as follows: 1. Gas-liquid separator body; 2. Mounting slot; 3. Gas phase outlet main pipe; 4. Liquid phase outlet main pipe; 5. Gas-liquid working fluid inlet main pipe; 6. Flow limiting and guiding baffle; 7. Gas-liquid separation assembly; 701. Umbrella-type baffle separation plate; 702. Flow perforation; 703. Separation plate fixing support rod; 8. Gas phase fine filtration assembly; 801. Fixing sleeve; 802. Lower limit fixing ring; 803. Upper limit fixing ring; 804. Primary filter screen plate; 805. Defoaming wire mesh; 806. Gas phase filter perforated plate; 9. Built-in limit block; 10. Gas phase pressure regulating valve one; 11. Working fluid inlet connecting pipe; 12. Gas phase pressure regulating valve two; 13. Gas phase outlet connecting pipe; 14. Liquid phase regulating valve; 15. Liquid phase outlet connecting pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] Reference Figures 1-6 A gas-liquid separation device for a waste heat power generation system includes: a gas-liquid separation tank 1; a gas-liquid working fluid inlet pipe 5 connected to the outside of the gas-liquid separation tank 1; a gas phase outlet pipe 3 connected to the top of the gas-liquid separation tank 1; a liquid phase outlet pipe 4 connected to the bottom of the gas-liquid separation tank 1; a flow-limiting and guiding baffle 6 provided on the inner side of the gas-liquid separation tank 1 corresponding to the inlet of the gas-liquid working fluid inlet pipe 5; the flow-limiting and guiding baffle 6 is a semi-open guiding structure; the flow-limiting and guiding baffle 6 is fixed to the inner side of the inlet end of the gas-liquid working fluid inlet pipe 5; and the opening of the flow-limiting and guiding baffle 6 is set towards the liquid phase outlet direction inside the tank; at least four sets of gas-liquid separation components 7 are arranged from top to bottom inside the gas-liquid separation tank 1; the multiple sets of gas-liquid separation components 7 are evenly arranged along the axial direction of the tank and symmetrically distributed on the upper and lower sides of the flow-limiting and guiding baffle 6 to realize multi-stage gradient gas-liquid separation; and a gas phase fine filter component 8 is provided on the top of the inner wall of the gas-liquid separation tank 1.

[0023] The gas-liquid separation tank 1 is the main pressure-bearing shell of the device, and the inner side wall of the gas-liquid separation tank 1 is provided with mounting slots 2 for component assembly and positioning.

[0024] The gas-liquid working fluid feed pipe 5 is provided with a gas phase pressure regulating valve 10 and a working fluid inlet connecting pipe 11 at the end away from the gas-liquid separation tank 1. The working fluid inlet connecting pipe 11 is connected to the side feed end of the gas-liquid separation tank 1 through the gas-liquid working fluid feed pipe 5, and is used to input the gas-liquid mixed working fluid output by the evaporator into the gas-liquid separation tank 1.

[0025] The end of the gas phase outlet main pipe 3 away from the gas-liquid separation tank 1 is provided with a gas phase pressure regulating valve 2 12 and a gas phase outlet connecting pipe 13 in sequence. The gas phase outlet connecting pipe 13 is connected in series with the gas phase pressure regulating valve 2 12 through the gas phase outlet main pipe 3. The gas phase outlet main pipe 3 is used to export qualified gas phase working fluid with a liquid phase ratio ≤0.5% after separation and fine filtration and meeting the drying requirements of the expander operation through the gas phase outlet connecting pipe 13.

[0026] The end of the liquid phase outlet main pipe 4 away from the gas-liquid separation tank 1 is equipped with a liquid phase regulating valve 14 and a liquid phase outlet connecting pipe 15 in sequence. The liquid phase outlet connecting pipe 15 is connected in series with the liquid phase regulating valve 14 through the liquid phase outlet main pipe 4, which is used to smoothly flow the separated liquid working medium to the external pipeline, ensuring the continuous and stable operation of the overall gas-liquid separation of the device.

[0027] The gas-liquid separation assembly 7 includes an umbrella-type baffle plate 701, a flow perforation 702, and a separation plate fixing support rod 703. The umbrella-type baffle plate 701 is fixedly installed inside the tank by the separation plate fixing support rod 703.

[0028] The umbrella-type baffle plate 701 is arranged in an inverted umbrella shape. The outer ring of the umbrella-type baffle plate 701 is provided with flow perforations 702 at equal intervals, and the diameter of the flow perforations 702 increases uniformly from the center to the outer edge.

[0029] The gas phase fine filtration assembly 8 includes a fixed sleeve 801, a lower limit fixed retaining ring 802, an upper limit fixed retaining ring 803, a primary filter screen 804, an antifoaming wire mesh 805, and a gas phase filter perforated plate 806. The inner wall of the gas-liquid separation tank 1 is provided with a built-in limit block 9 on the side near the gas phase outlet main pipe 3, and the fixed sleeve 801 is snapped into the top of the inner wall of the gas-liquid separation tank 1 by the built-in limit block 9.

[0030] The upper and lower ends of the inner side of the fixed sleeve 801 are respectively provided with an upper limit fixing ring 803 and a lower limit fixing ring 802. The upper limit fixing ring 803 and the lower limit fixing ring 802 are welded and fixed to the inner wall of the fixed sleeve 801. The upper limit fixing ring 803 and the lower limit fixing ring 802 form a closed limiting installation cavity to axially limit and fix the internal filter components, preventing the filter components from axially moving or shifting.

[0031] The primary filter plate 804, the defoaming mesh 805, and the gas phase filter plate 806 are nested and assembled sequentially from bottom to top in the limiting installation cavity inside the fixed sleeve 801. The three are parallel and tightly fitted together. The primary filter plate 804 is arranged near the gas-liquid separation component 7, and the gas phase filter plate 806 is arranged near the gas phase outlet main pipe 3. This allows the rising gas phase working fluid to pass through primary filtration, defoaming and liquid removal, and precision filtration in sequence, removing fine droplets step by step to ensure that the dryness of the outlet gas phase working fluid meets the standard.

[0032] During use, the entire device is connected to the low-temperature flue gas waste heat power generation system. The gas-liquid mixed organic working fluid output from the evaporator is first connected to the working fluid inlet connection pipe 11 via an external pipeline. After the initial adjustment of the feed flow rate and pressure is completed by the gas phase pressure regulating valve 10, it is smoothly fed into the gas-liquid working fluid feed main pipe 5 and finally introduced laterally into the gas-liquid separation tank 1. At the moment the working fluid enters the chamber of the gas-liquid separation tank 1, it flows through the flow-limiting guide baffle 6 fixed inside the inlet of the gas-liquid working fluid feed main pipe 5. Relying on the semi-open guide structure of the flow-limiting guide baffle 6 and the opening layout facing the liquid phase outlet direction, the high-speed turbulent gas-liquid mixed working fluid is forcibly stabilized, rectified and guided, disrupting the disordered flow field and forming a regular swirling flow field inside the tank. By utilizing the coupling effect of centrifugal force and gravity, the initial sedimentation and separation of large-diameter liquid droplets in the mixed working fluid is achieved, completing the first-stage pre-separation operation and effectively avoiding the problem of reduced separation efficiency caused by feed deviation and airflow turbulence. After pre-separation, the gas-liquid two-phase mixture changes its flow direction under the forced guidance of the flow-limiting baffle 6. It first flows downward, precisely flushing the multiple sets of gas-liquid separation components 7 located inside the gas-liquid separation tank 1 and below the built-in limiting baffle 9, completing the lower-level primary flow separation operation. After being deflected, accelerated, and collided by the lower-level gas-liquid separation components 7, the working fluid flows upward under the pressure difference inside the tank, continuing to pass through the multiple sets of gas-liquid separation components 7 axially evenly arranged above the built-in limiting baffle 9, achieving multi-stage gradient layer separation from bottom to top. During the flow of the working fluid through each set of gas-liquid separation components 7, it is stably supported by the inverted umbrella-shaped baffle 703. Separation plate 701 forcibly disrupts the airflow pattern, causing the gas-liquid mixture to repeatedly fold back, turbulently move, and change speed. At the same time, the mixture passes evenly through the flow perforations 702 distributed in a ring array on the outer ring of the umbrella-shaped baffle separation plate 701. With the gradient structure of the flow perforations 702, whose aperture increases uniformly from the center to the outer edge, different particle sizes of droplets are captured by stratified disturbance. During this process, the small and medium-sized micro-droplets entrained in the gas phase continuously collide, aggregate, and clump together to increase their weight. After being freed from the entrainment force of the gas phase, they settle into the liquid accumulation chamber at the bottom of the gas-liquid separation tank 1 under the action of gravity. Through the folding multi-stage separation structure of downward guidance and upward return, the gas-liquid separation efficiency and separation accuracy are greatly improved, and the main secondary separation operation of the device is completed. The low-liquid-content gaseous working fluid, after being processed by the multi-stage gas-liquid separation component 7, continues to be conveyed upwards along the chamber of the gas-liquid separation tank 1, entering the gas phase fine filtration component 8 built into the top of the tank for deep fine filtration and liquid removal. The gas phase fine filtration component 8 is fixed to the top of the inner wall of the gas-liquid separation tank 1 by being snapped in place by the built-in limiting block 9. The fixed sleeve 801, the upper limit fixing ring 803, and the lower limit fixing ring 802 form a closed limiting installation cavity, ensuring that the internal filter components do not move or shift. The gaseous working fluid flows sequentially from bottom to top. The liquid flows through a series of stacked primary filter plates 804, defoaming wire mesh 805, and gas phase filter plates 806. First, the primary filter plate 804 intercepts and coarsely filters out large residual droplets. Then, the high-precision defoaming wire mesh 805 breaks down and adsorbs micron-sized and foamy droplets suspended in the gas phase, achieving defoaming and liquid removal. Finally, the gas phase filter plate 806 completes the final precision filtration, thoroughly removing trace amounts of liquid impurities remaining in the gas phase. This step-by-step deep purification process strictly controls the liquid-to-gas ratio to ≤0.5%. After undergoing three-stage deep separation and precision filtration, the completely dried and qualified gaseous working fluid is collected and discharged from the gas phase outlet pipe 3 at the top of the gas-liquid separation tank 1. It flows through the gas phase pressure regulating valve 2 12 and is stably delivered to the downstream expander equipment via the gas phase outlet connecting pipe 13. This fully meets the requirements of the expander for long-term dry, stable and erosion-free operation, and avoids failures such as droplet impact, cavitation wear and unit vibration from the root. Meanwhile, during the gas-liquid separation process, all the liquid organic working fluid that settles and accumulates in the liquid accumulation chamber at the bottom of the gas-liquid separation tank 1 is collected centrally through the liquid phase outlet pipe 4 connected to the bottom. The liquid working fluid is regulated in real time by the liquid phase regulating valve 14 to control the return flow rate and the liquid level inside the tank, so as to avoid the liquid level being too high and submerging the separation components and affecting the separation efficiency, while preventing the liquid level from being too low and causing gas flow to short-circuit. Finally, the stable liquid working fluid is returned to the liquid storage end of the ORC system through the liquid phase outlet connection pipe 15, realizing the closed-loop recycling of the organic working fluid, continuously maintaining the dynamic stability of the gas-liquid separation condition inside the device, and ensuring the long-term continuous and efficient operation of the entire equipment.

[0033] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A working fluid gas-liquid separation device for a waste heat power generation system, characterized in that, include: A gas-liquid separation tank (1) is provided with a gas-liquid working fluid inlet pipe (5) connected to the outside of the gas-liquid separation tank (1), a gas phase outlet pipe (3) connected to the top of the gas-liquid separation tank (1), and a liquid phase outlet pipe (4) connected to the bottom of the gas-liquid separation tank (1). A flow-limiting guide baffle (6) is provided on the inner side of the gas-liquid separation tank (1) at the inlet of the gas-liquid working fluid inlet pipe (5). The flow-limiting guide baffle (6) is a semi-open guide structure. 6) Fixed inside the inlet end of the gas-liquid working fluid feed pipe (5), and the opening of the flow limiting guide baffle (6) is set towards the liquid phase outlet direction inside the tank. The gas-liquid separation tank (1) is provided with no less than four sets of gas-liquid separation components (7) from top to bottom. Multiple sets of gas-liquid separation components (7) are evenly arranged along the tank axis and symmetrically distributed on the upper and lower sides of the flow limiting guide baffle (6) to realize multi-stage gradient gas-liquid separation. The gas phase fine filter component (8) is provided on the top of the inner wall of the gas-liquid separation tank (1).

2. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The gas-liquid separation tank (1) is the main pressure-bearing shell of the device, and the inner side wall of the gas-liquid separation tank (1) is provided with an installation slot (2) for component assembly and positioning.

3. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The gas-liquid working fluid feed pipe (5) is provided with a gas phase pressure regulating valve (10) and a working fluid inlet connecting pipe (11) at the end away from the gas-liquid separation tank (1). The working fluid inlet connecting pipe (11) is connected to the side feed end of the gas-liquid separation tank (1) through the gas-liquid working fluid feed pipe (5) and is used to input the gas-liquid mixed working fluid output by the evaporator into the gas-liquid separation tank (1).

4. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The gas phase outlet main pipe (3) is provided with a gas phase pressure regulating valve II (12) and a gas phase outlet connecting pipe (13) at the end away from the gas-liquid separation tank (1). The gas phase outlet connecting pipe (13) is connected in series with the gas phase pressure regulating valve II (12) through the gas phase outlet main pipe (3). The gas phase outlet main pipe (3) is used to export qualified gas phase working fluid with a liquid phase ratio ≤0.5% and meeting the drying requirements of the expander operation through the gas phase outlet connecting pipe (13).

5. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The liquid phase outlet main pipe (4) is provided with a liquid phase regulating valve (14) and a liquid phase outlet connecting pipe (15) at the end away from the gas-liquid separation tank (1). The liquid phase outlet connecting pipe (15) is connected in series with the liquid phase regulating valve (14) through the liquid phase outlet main pipe (4) to smoothly flow the separated liquid working medium to the external pipeline, ensuring the continuous and stable operation of the overall gas-liquid separation of the device.

6. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The gas-liquid separation assembly (7) includes an umbrella-type baffle plate (701), a flow perforation (702), and a separation plate fixing support rod (703). The umbrella-type baffle plate (701) is fixedly installed inside the tank by the separation plate fixing support rod (703).

7. A working fluid gas-liquid separation device for a waste heat power generation system according to claim 6, characterized in that, The umbrella-shaped baffle plate (701) is arranged in an inverted umbrella shape. The outer ring of the umbrella-shaped baffle plate (701) is provided with flow perforations (702) at equal intervals, and the diameter of the flow perforations (702) increases uniformly from the center to the outer edge.

8. The working fluid gas-liquid separation device for a waste heat power generation system according to claim 1, characterized in that, The gas phase fine filtration assembly (8) includes a fixed sleeve (801), a lower limit fixed retaining ring (802), an upper limit fixed retaining ring (803), a primary filter screen (804), a defoaming wire mesh (805), and a gas phase filter perforated plate (806). The inner wall of the gas-liquid separation tank (1) is provided with a built-in limiting block (9) on the side near the gas phase outlet main pipe (3), and the fixed sleeve (801) is snapped onto the top of the inner wall of the gas-liquid separation tank (1) by the built-in limiting block (9).

9. A working fluid gas-liquid separation device for a waste heat power generation system according to claim 8, characterized in that, The upper and lower ends of the inner side of the fixed sleeve (801) are respectively provided with an upper limit fixing ring (803) and a lower limit fixing ring (802). The upper limit fixing ring (803) and the lower limit fixing ring (802) are welded and fixed to the inner wall of the fixed sleeve (801). The upper limit fixing ring (803) and the lower limit fixing ring (802) form a closed limiting installation cavity to axially limit and fix the internal filter component, preventing the filter component from axially moving or shifting.

10. A working fluid gas-liquid separation device for a waste heat power generation system according to claim 9, characterized in that, The primary filter screen (804), defoaming mesh (805), and gas phase filter plate (806) are nested and assembled in the limiting installation cavity inside the fixed sleeve (801) from bottom to top, and the three are stacked parallel to each other and tightly fitted. The primary filter screen (804) is arranged on the side closer to the gas-liquid separation component (7), and the gas phase filter plate (806) is arranged on the side closer to the gas phase outlet main pipe (3), so that the rising gas phase working fluid passes through primary filtration, defoaming and liquid removal, and precision filtration in sequence, removing fine droplets step by step, and ensuring that the dryness of the outlet gas phase working fluid meets the standard.

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