A kind of PSA inlet buffer tank condensate recovery mechanism

Abstract

The utility model belongs to petroleum chemical plant technical field especially a kind of pressure swing adsorption entrance buffer tank condensate recovery mechanism, including the tank body that condensate is discharged, the upper surface of the tank body is equipped with liquid level sensor, the lower surface of the tank body is fixedly connected with liquid taking pipeline, the lower surface of the liquid taking pipeline is fixedly connected with flow regulating pipeline, the branch pipeline of the flow regulating pipeline is connected with flow regulating mechanism, the downside of the flow regulating mechanism is provided with mixed flow mechanism.The pressure swing adsorption entrance buffer tank condensate recovery mechanism, by electric regulating valve real-time adjustment, condensate and pre-hydrogenation feed flow fluctuation amplitude reduce after incorporation, pressure swing adsorption system pressure fluctuation reduces, simultaneously by primary, secondary, tertiary cage pipe sliding nesting, annular orifice and buffer spring design, graded absorption pressure fluctuation, inhibit cavitation erosion, flashing risk caused by high pressure difference, to realize dynamic steady voltage anti-interference, guarantee system safety.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical equipment technology, and in particular to a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank. Background Technology

[0002] In petrochemical production, the inlet buffer tank of the pressure swing adsorption (PSA) unit is used to stabilize the pressure of the feed gas. During operation, condensate is generated due to temperature changes. Currently, this condensate is usually directly discharged into the flare system or sludge system, which not only wastes resources but also increases environmental treatment costs. The feed of the pre-hydrogenation unit of the reforming unit is naphtha, whose main components are C5-C12 hydrocarbons. If the effective hydrocarbons in the condensate of the PSA inlet buffer tank can be recovered and incorporated into the pre-hydrogenation feed, the feed utilization rate can be improved.

[0003] However, existing technologies still have drawbacks: 1. Condensate from the inlet buffer tank of the pressure swing adsorption (PSA) unit is usually directly discharged into the flare system or sludge system, which not only wastes resources but also increases environmental treatment costs; 2. The flow rate and pressure of the condensate from the inlet buffer tank of PSA are greatly affected by fluctuations in the upstream feed gas. Direct integration can easily lead to unstable pressure and flow rate in the pre-hydrogenation feed system, affecting reaction efficiency; 3. The lack of targeted flow regulation and safety control measures may lead to cross-pressure accidents. Traditional retrofits require the addition of independent buffer equipment and transfer pumps, which are time-consuming and costly, and are not suitable for rapid upgrades of existing units. Therefore, there is an urgent need for a technical upgrade scheme that is compatible with existing units, low-cost, and can stably control the integration of condensate from the inlet buffer tank of PSA into the pre-hydrogenation unit. Utility Model Content

[0004] Based on the aforementioned technical problems, this utility model proposes a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank.

[0005] This utility model proposes a pressure swing adsorption inlet buffer tank condensate recovery mechanism, including a tank body for discharging condensate. A liquid level sensor is installed on the upper surface of the tank body, and a liquid intake pipe is fixedly connected to the lower surface of the tank body. A flow regulating pipe is fixedly connected to the lower surface of the liquid intake pipe, and a branch pipe of the flow regulating pipe is connected to a flow regulating mechanism. A mixing mechanism is provided below the flow regulating mechanism.

[0006] The flow regulation mechanism includes an electric regulating valve, which reduces the pressure and regulates the flow rate of the circulating condensate fluid.

[0007] The flow regulating mechanism also includes a check valve installed at the outlet end of the electric regulating valve.

[0008] The mixing mechanism includes a Venturi-type flow stabilizer fixedly connected to the outlet end of the check valve. The lower surface of the Venturi-type flow stabilizer is fixedly connected to a vortex housing with a drain pipe. One side surface of the inlet pipe end of the vortex housing is fixedly connected to a parallel pipeline. A vortex fan blade is rotatably connected inside the vortex housing. A turbine generator is provided on one side of the vortex housing. A drive shaft is rotatably connected to the inner surface of the vortex fan blade through a sealed bearing.

[0009] The mixing mechanism first uses the Venturi stabilizing cylinder and the vortex shell to perform high-intensity shear mixing of the pressure swing adsorption condensate and the naphtha from the inlet pipeline to form a uniform pre-hydrogenated feedstock, which is then transported to the downstream device. At the same time, the mechanism uses the swirling flow formed by the mixed fluid to drive the turbine generator to generate electricity, which is used to supply the liquid level sensor, thus completing the recovery and self-utilization of the kinetic energy of the mixing process.

[0010] Preferably, the flow regulating mechanism further includes a pressure reducing pipe fixedly connected to the upper surface of the electric regulating valve pipe. The inlet end of the pressure reducing pipe is directly connected to the main pipe of the flow regulating pipeline at the inlet of the electric regulating valve through a tee fitting, and the outlet end of the pressure reducing pipe is fixedly connected to the upper surface of the electric regulating valve body.

[0011] Through the above technical solution, in order to divert and reduce the pressure of condensate fluid and avoid flashing or cavitation caused by excessive pressure difference in single-stage regulating valve, the pressure reduction pipe is used as a branch pipe of the electric regulating valve. When the condensate flow rate changes suddenly, the pressure reduction pipe can quickly divert and buffer the pressure shock, so that the electric regulating valve can work in a more stable pressure difference range, thereby improving the response accuracy and linearity of the DCS system to flow regulation.

[0012] Preferably, the flow regulating mechanism further includes a primary cage pipe, a secondary cage pipe, and a tertiary cage pipe. The primary cage pipe is fixedly installed in the internal cavity of the pressure-reducing pipe, and its top end is fixedly connected to a branch pipe of the flow regulating pipeline through a connecting pipe. The secondary cage pipe is slidably sleeved on the outer periphery of the primary cage pipe, and the tertiary cage pipe is slidably sleeved on the outer periphery of the secondary cage pipe, thereby forming an axially expandable multi-stage sleeve structure. The lower outer surfaces of the primary cage pipe and the secondary cage pipe are both fixedly sleeved with limiting rings, and the outer peripheral walls of the limiting rings are in slidable contact with the inner top walls of the sleeved secondary cage pipe and the tertiary cage pipe, respectively.

[0013] Through the above technical solution, in order to buffer the pressure of the discharged condensate fluid, the condensate fluid enters the first-stage cage pipe through the connecting pipe. Its pressure drives the second-stage and third-stage cage pipes to expand and contract adaptively, thereby relieving the pressure. When the cage pipe slides, the limiting ring moves relative to the inner wall to scrape off the deposits and prevent hydrocarbon coking and blockage.

[0014] Preferably, the flow regulating mechanism further includes throttling orifices arranged in a ring array through the primary, secondary, and tertiary cage pipes. The diameter of the three sets of throttling orifices increases sequentially from the primary to the tertiary level. A buffer spring is provided inside the primary cage pipe, with its upper end connected to the inner top wall of the primary cage pipe and its lower end connected to the bottom of the tertiary cage pipe.

[0015] Through the above technical solution, in order to improve fluid stability and filter impurities in the fluid, the condensate fluid passes through the throttling orifice from multiple directions simultaneously, forming a uniform micro-jet stream. This reduces the local turbulence intensity caused by single-point throttling, avoids pressure pulsation and flow fluctuations, and improves fluid stability. The condensate fluid is filtered when passing through the throttling orifice. At the same time, the buffer spring connects the bottom of the three-stage cage tube to the top wall of the inner wall of the first-stage cage tube, forming an elastic support system. When the condensate pressure fluctuates, the buffer spring dynamically adjusts the position of the three cage tubes through compression and rebound. The elastic deformation of the buffer spring absorbs the kinetic energy of the fluid impact, converts it into potential energy for storage and slow release, and reduces the water hammer effect when the valve is opened and closed.

[0016] Preferably, the flow regulating mechanism further includes a check valve installed at the outlet end of the electric regulating valve, the check valve being a double-mode self-sealing check valve, comprising,

[0017] Valve body,

[0018] The secondary sealing layer, made of nano-graphite-filled PTFE material, is located at the valve seat of the valve body;

[0019] And the main sealing layer, made of shape memory alloy, is linked with the valve disc, and the phase transition temperature of the shape memory alloy is 45°C.

[0020] With the above technical solution, when the valve body temperature exceeds 45℃ or a slight pressure difference is detected, the main sealing layer undergoes phase change expansion, forming a metal-soft double seal together with the secondary sealing layer. In order to prevent condensate backflow, a check valve is set. Through an automatic opening and closing mechanism, it opens when the fluid flows in the forward direction and closes quickly when it flows in the reverse direction, fundamentally blocking the backflow of the medium.

[0021] Preferably, a driven gear is fixedly sleeved on the outer surface of the output shaft of the turbine generator, and a driving gear is fixedly sleeved on the outer surface of the drive shaft, with the driving gear meshing with the driven gear.

[0022] To resolve the contradiction between fluid kinetic energy fluctuations and the stable operation requirements of the generator, the driving gear and driven gear achieve precise matching of speed and torque through gear ratio design. When the eddy fan blade speed is high but the torque is low, the generator input torque can be increased by using a driving gear with a large number of teeth and a driven gear with a small number of teeth, avoiding a decrease in power generation efficiency due to insufficient speed. Based on the design method, the preferred gear ratio of the driving gear and driven gear is 3:1 to 8:1. When the eddy fan blade speed is high but the torque is low, for example, speed > 800 rpm and torque < 5 N·m, a larger gear ratio, such as 6:1 to 8:1, is adopted. By designing the driving gear to be much larger than the driven gear, a significant increase in torque and a moderate increase in speed are achieved, ensuring that the generator can obtain sufficient driving torque and avoiding low efficiency due to insufficient torque. When the eddy fan blade speed and torque are both moderate, a moderate gear ratio, such as 3:1 to 5:1, is adopted to achieve a balance between speed increase and torque increase, allowing the generator to operate in the optimal efficiency range.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. By setting up a flow regulation mechanism, the pressure of the flowing condensate fluid can be reduced and the flow rate can be regulated. During the regulation process, the electric regulating valve is adjusted in real time. After the condensate is incorporated, the fluctuation range of the pre-hydrogenated feed flow rate is reduced, and the pressure fluctuation of the pressure swing adsorption system is reduced. At the same time, through the design of primary, secondary and tertiary cage tube sliding nesting, annular throttling orifice and buffer spring, pressure fluctuations are absorbed in stages, suppressing the risk of cavitation and flash evaporation caused by high pressure difference, thereby achieving dynamic pressure stabilization and anti-disturbance, and ensuring system safety.

[0025] 2. By setting up a mixing mechanism, the condensate from the pressure swing adsorption buffer tank can be directly recovered and incorporated into the naphtha feed system of the pre-hydrogenation unit, replacing the traditional treatment method of discharging into the flare or sludge oil, reducing the waste of hydrocarbon resources. During the adjustment process, the Venturi stabilizer converts the kinetic energy of the condensate into stable pressure energy, and the vortex shell introduces naphtha through the inlet pipeline, forming a forced vortex with the falling condensate fluid in the shell. The condensate and naphtha generate high-intensity shear and turbulent diffusion in the spiral flow field, achieving molecular-level uniform mixing. The mixed fluid drives the fan blades to rotate in the vortex shell, which drives the turbine generator to generate electricity through gear transmission, thereby recovering the fluid kinetic energy and converting it into electrical energy, which is supplied locally to equipment such as liquid level sensors, reducing dependence on external power. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank according to the present invention.

[0027] Figure 2 This is a three-dimensional view of the electric regulating valve structure of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank proposed in this utility model.

[0028] Figure 3 A three-dimensional view of the check valve structure of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank proposed in this utility model;

[0029] Figure 4 This is a three-dimensional view of the primary cage tube structure of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank proposed in this utility model.

[0030] Figure 5 This is a three-dimensional view of the buffer spring structure of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank proposed in this utility model.

[0031] Figure 6 A perspective view of the throttling orifice structure of a condensate recovery mechanism for a pressure swing adsorption inlet buffer tank proposed in this utility model;

[0032] Figure 7 This is a three-dimensional view of the vortex shell structure of a pressure swing adsorption inlet buffer tank condensate recovery mechanism proposed in this utility model;

[0033] Figure 8 This is a three-dimensional view of the turbine generator structure of the condensate recovery mechanism of the pressure swing adsorption inlet buffer tank proposed in this utility model.

[0034] In the diagram: 1. Tank body; 11. Liquid level sensor; 12. Liquid intake pipe; 13. Flow regulation pipe; 2. Flow regulation mechanism; 21. Electric regulating valve; 22. Pressure reducing pipe; 23. Primary cage pipe; 24. Secondary cage pipe; 25. Tertiary cage pipe; 26. Limiting ring; 27. Throttling orifice; 28. Buffer spring; 29. ​​Check valve; 291. Valve body; 292. Secondary sealing layer; 293. Primary sealing layer; 3. Mixing mechanism; 31. Venturi flow stabilizer; 32. Vortex shell; 33. Connecting pipe; 34. Vortex fan blade; 35. Turbine generator; 36. Drive shaft; 37. Driven gear; 38. Driving gear. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0036] Reference Figures 1-8 A pressure swing adsorption inlet buffer tank condensate recovery mechanism includes a tank body 1 for discharging condensate, a liquid level sensor 11 installed on the upper surface of the tank body 1, a liquid intake pipe 12 fixedly connected to the lower surface of the tank body 1, a flow regulating pipe 13 fixedly connected to the lower surface of the liquid intake pipe 12, a branch pipe of the flow regulating pipe 13 connected to a flow regulating mechanism 2, and a mixing mechanism 3 provided below the flow regulating mechanism 2.

[0037] The flow regulation mechanism 2 includes an electric regulating valve 21, which reduces the pressure and regulates the flow rate of the circulating condensate fluid.

[0038] The flow regulating mechanism 2 also includes a check valve 29 installed at the outlet end of the electric regulating valve 21.

[0039] The mixing mechanism 3 includes a Venturi-type flow stabilizer 31 fixedly connected to the outlet end of the check valve 29. The lower surface of the Venturi-type flow stabilizer 31 is fixedly connected to a vortex housing 32 with a drain pipe. One side surface of the inlet pipe end of the vortex housing 32 is fixedly connected to a parallel pipe 33. A vortex fan blade 34 is rotatably connected inside the vortex housing 32. A turbine generator 35 is provided on one side of the vortex housing 32. The inner surface of the vortex fan blade 34 is rotatably connected to a drive shaft 36 through a sealed bearing.

[0040] The mixing mechanism 3 first uses the Venturi stabilizer 31 and the vortex shell 32 to perform high-intensity shear mixing of the pressure swing adsorption condensate and the naphtha from the inlet pipe 33 to form a uniform pre-hydrogenation feedstock, which is then discharged from the drain pipe at the bottom of the vortex shell 32 and transported to the downstream unit (i.e., the pre-hydrogenation unit). At the same time, the mechanism uses the swirling flow formed by the mixed fluid to drive the turbine generator 35 to generate electricity, which is used to supply the liquid level sensor 11, thus completing the recovery and self-utilization of the kinetic energy of the mixing process.

[0041] To divert and reduce the pressure of the condensate fluid and prevent flashing or cavitation caused by excessive pressure difference in the single-stage regulating valve, the flow regulating mechanism 2 also includes a pressure reducing pipe 22 fixedly connected to the upper surface of the valve pipe of the electric regulating valve 21. The inlet end of the pressure reducing pipe 22 is directly connected to the main pipe of the flow regulating pipeline 13 at the inlet of the electric regulating valve 21 through a tee fitting, and the outlet end of the pressure reducing pipe 22 is fixedly connected to the upper surface of the valve body of the electric regulating valve 21. As a branch pipeline of the electric regulating valve 21, the pressure reducing pipe 22 can quickly divert and buffer the pressure shock when the condensate flow changes abruptly, so that the electric regulating valve 21 can work in a more stable pressure difference range, thereby improving the response accuracy and linearity of the flow regulation.

[0042] To buffer the pressure of the discharged condensate fluid, the flow regulating mechanism 2 also includes a primary cage pipe 23, a secondary cage pipe 24, and a tertiary cage pipe 25. The primary cage pipe 23 is fixedly installed in the internal cavity of the pressure-reducing pipe 22, and its top end is fixedly connected to a branch pipe of the flow regulating pipeline 13 through a connecting pipe. The secondary cage pipe 24 is slidably sleeved on the outer periphery of the primary cage pipe 23, and the tertiary cage pipe 25 is slidably sleeved on the outer periphery of the secondary cage pipe 24, thus forming an axially expandable multi-stage sleeve structure. The lower outer surfaces of the primary cage pipe 23 and the secondary cage pipe 24 are both fixedly sleeved with limiting rings 26. The outer peripheral wall of the limiting ring 26 slides in contact with the inner top wall of the sleeved secondary cage pipe 24 and the tertiary cage pipe 25, respectively. The condensate fluid enters the interior of the primary cage pipe 23 through the connecting pipe, and its pressure drives the secondary cage pipe 24 and the tertiary cage pipe 25 to expand and contract adaptively, thereby relieving the pressure. When the cage pipe slides, the limiting ring 26 moves relative to the inner wall to scrape off the deposits and prevent hydrocarbon coking and blockage.

[0043] To improve fluid stability and filter impurities in the fluid, the flow regulating mechanism 2 also includes throttling orifices 27 arranged in a ring array and penetrating through the primary cage tube 23, secondary cage tube 24, and tertiary cage tube 25. The orifice diameters of the three sets of throttling orifices 27 increase sequentially from the first to the third stage. A buffer spring 28 is installed inside the primary cage tube 23, with its upper end connected to the inner top wall of the primary cage tube 23 and its lower end connected to the bottom of the tertiary cage tube 25. The condensate fluid passes through the throttling orifices 27 simultaneously from multiple directions, forming a uniform microjet stream. This reduces the intensity of local turbulence caused by single-point throttling, avoids pressure pulsation and flow fluctuation, improves fluid stability, and achieves filtration when the condensate fluid passes through the throttling orifice 27. At the same time, the buffer spring 28 connects the bottom end of the third-stage cage tube 25 to the inner top wall of the first-stage cage tube 23, forming an elastic support system. When the condensate pressure fluctuates, the buffer spring 28 dynamically adjusts the position of the three cage tubes through compression and rebound. The elastic deformation of the buffer spring 28 absorbs the kinetic energy of the fluid impact, converts it into potential energy for storage and slow release, and reduces the water hammer effect when the valve is opened and closed.

[0044] The flow regulating mechanism 2 also includes a check valve 29 installed at the outlet end of the electric regulating valve 21. The check valve 29 is a dual-mode self-sealing check valve 29, which includes a valve body 291, a secondary sealing layer 292 and a main sealing layer 293.

[0045] The secondary sealing layer 292, made of nano-graphite-filled PTFE material, is located at the valve seat of the valve body 291.

[0046] The main sealing layer 293 is made of shape memory alloy and is linked with the valve disc. The phase change temperature of the shape memory alloy is 45°C. When the temperature of the valve body 291 exceeds 45°C or a slight pressure difference is detected, the main sealing layer 293 undergoes phase change expansion, forming a metal-soft double seal together with the secondary sealing layer 292. In order to prevent the backflow of condensate, a check valve 29 is set. Through an automatic opening and closing mechanism, it opens when the fluid flows in the forward direction and closes quickly when it flows in the reverse direction, fundamentally blocking the backflow of the medium.

[0047] By setting the flow regulation mechanism 2, the pressure of the flowing condensate fluid can be reduced and the flow rate can be regulated. During the regulation process, the electric regulating valve 21 is adjusted in real time. After the condensate is incorporated, the fluctuation range of the pre-hydrogenated feed flow rate is reduced, and the pressure fluctuation of the pressure swing adsorption system is reduced. At the same time, through the design of the sliding nesting of the first-stage, second-stage, and third-stage cage tubes 25, the annular throttling orifice 27, and the buffer spring 28, the pressure fluctuation is absorbed in stages, and the risk of cavitation and flash evaporation caused by high pressure difference is suppressed, thereby achieving dynamic pressure stabilization and disturbance rejection, and ensuring system safety.

[0048] Among them, the mixing mechanism 3 mixes the condensate fluid with naphtha and utilizes the hybrid power.

[0049] The Venturi-type flow stabilizer 31 adopts a three-stage structure consisting of a contraction section, a throat, and a diffuser section. After the condensate fluid is depressurized by the electric regulating valve 21, it enters the contraction section, where the flow velocity increases sharply and the static pressure decreases, forming a high-speed jet at the throat. Subsequently, as it passes through the diffuser section, the kinetic energy is gradually converted into pressure energy, achieving pressure recovery. This process avoids turbulence and energy loss caused by sudden pressure changes, providing a stable pressure foundation for subsequent mixing. The vortex shell 32 introduces naphtha through the inlet pipe 33, which is connected to the vortex shell 32 at an angle of no more than 45°. This allows the naphtha and the falling condensate fluid to form a forced vortex within the shell. The condensate and naphtha generate high-intensity shear and turbulent diffusion in the spiral flow field, achieving molecular-level uniform mixing and thus improving the utilization rate of raw materials. The mixed condensate fluid and naphtha are used as pre-hydrogenation feedstock.

[0050] To achieve a self-closed-loop energy system and complete the energy self-recovery technology during the condensate depressurization process, the vortex fan blade 34 is driven by the rotational impact of the condensate and naphtha mixture within the vortex housing 32, converting the fluid kinetic energy into rotational mechanical energy. The vortex fan blade 34 directly drives the turbine generator 35 through the drive shaft 36 connected by the sealed bearing, converting the mechanical energy into electrical energy, thereby realizing the recovery and utilization of the kinetic energy of the mixed fluid. The electrical energy generated by the turbine generator 35 can be supplied to the liquid level sensor 11 locally, reducing dependence on external power.

[0051] To resolve the conflict between fluid kinetic energy fluctuations and the stable operation requirements of the generator, a driven gear 37 is fixedly sleeved on the outer surface of the output shaft of the turbine generator 35, and a driving gear 38 is fixedly sleeved on the outer surface of the drive shaft 36. The driving gear 38 meshes with the driven gear 37. The speed and torque are matched by the gear ratio design of the driving gear 38 and the driven gear 37. When the vortex fan blade 34 has a high speed but low torque, the generator input torque can be increased by the large-tooth-number driving gear 38 and the small-tooth-number driven gear 37, avoiding a decrease in power generation efficiency due to insufficient speed. Based on the design method, the driving gear 38 and the driven gear... The preferred gear ratio of wheel 37 is 3:1 to 8:1. When the vortex fan blade 34 has a high speed but low torque, for example, speed > 800 rpm and torque < 5 N·m, a larger gear ratio, such as 6:1 to 8:1, is adopted. By designing the driving gear 38 to be much larger than the driven gear 37, a significant increase in torque and a moderate increase in speed are achieved, ensuring that the generator can obtain sufficient driving torque and avoiding low efficiency due to insufficient torque. When the speed and torque of the vortex fan blade 34 are both moderate, a moderate gear ratio, such as 3:1 to 5:1, is adopted to achieve a balance between speed increase and torque increase, so that the generator operates in the optimal efficiency range.

[0052] By setting up the mixing mechanism 3, the condensate from the pressure swing adsorption buffer tank can be directly recovered and incorporated into the naphtha feed system of the pre-hydrogenation unit, replacing the traditional treatment method of discharging into the flare or sludge oil, reducing the waste of hydrocarbon resources. During the adjustment process, the Venturi stabilizer converts the kinetic energy of the condensate into stable pressure energy, and the vortex shell 32 introduces naphtha through the inlet pipe 33, forming a forced vortex with the falling condensate fluid in the shell. The condensate and naphtha generate high-intensity shear and turbulent diffusion in the spiral flow field, achieving molecular-level uniform mixing. The mixed fluid drives the fan blades to rotate in the vortex shell 32, which drives the turbine generator 35 to generate electricity through gear transmission, thereby recovering the fluid kinetic energy and converting it into electrical energy, which is supplied locally to equipment such as the liquid level sensor 11, reducing the dependence on external power.

[0053] Working principle: In a specific embodiment of this utility model, condensate is generated during the operation of tank 1, and the liquid level in the tank rises. The liquid level sensor 11 installed on tank 1 monitors the liquid level in real time. Before the high-pressure condensate flows through the electric regulating valve 21, it enters its parallel multi-stage pressure-reducing cage pipe system. The condensate is released through the throttling orifices 27 with progressively larger orifices on the first-stage cage pipe 23, the second-stage cage pipe 24, and the third-stage cage pipe 25, thus achieving pressure gradient release and avoiding cavitation and noise caused by single-point pressure reduction. The buffer spring 28 and the sliding nested structure absorb the kinetic energy of pressure fluctuations, convert it into potential energy and release it slowly, which greatly suppresses the water hammer effect and flow pulsation. This mechanical structure ensures the condensate pressure entering the electric regulating valve 21.

[0054] The condensate, which is regulated and stabilized by the electric regulating valve 21, passes through the check valve 29 before entering the mixing unit. Under normal operating conditions, the fluid flows in the forward direction, and the PTFE soft sealing layer can ensure the seal. Under abnormal operating conditions, when a slight pressure difference is detected or the temperature exceeds 45°C, the main sealing layer 293, made of shape memory alloy, undergoes phase change expansion, forming a hard metal-soft double seal with the secondary sealing layer 292. This fundamentally eliminates the risk of backflow and cross-pressure of the medium, ensuring the safety of the upstream pressure swing adsorption system.

[0055] After stabilization, the condensate enters the mixing mechanism 3. First, it passes through the Venturi-type stabilizing cylinder 31, which converts the fluid kinetic energy into pressure energy through the structure of contraction, throat and diffusion, providing a stable pressure basis for mixing. The condensate enters the vortex shell 32 and meets the naphtha introduced from the inlet pipe 33. The two form a forced swirling flow in the shell, and under the action of high-intensity shear and turbulent diffusion, they achieve rapid and uniform mixing at the molecular level, becoming a qualified pre-hydrogenated feedstock.

[0056] The rotational kinetic energy of the mixed fluid drives the vortex fan blade 34 to rotate. The vortex fan blade 34 precisely matches the speed and torque through the drive shaft 36 and the drive gear 38 meshing with the driven gear 37, and then transmits it to the turbine generator 35. The turbine generator 35 converts the fluid kinetic energy into electrical energy for storage and supplies it to the liquid level sensor 11 on-site, forming an energy self-recovery closed loop, reducing the system's dependence on external power. Finally, the mixed fluid is discharged and utilized through the drain pipe of the vortex housing 32.

[0057] To ensure the continuity and stability of power supply between the turbine generator 35 and the liquid level sensor 11, a rectifier module, an energy storage module, and a voltage regulator module are sequentially arranged between the turbine generator 35 and the liquid level sensor 11 to achieve rectification, energy storage, and voltage regulation. Preferably, the selection, installation, and connection methods of the rectifier module, energy storage module, and voltage regulator module are all conventional and mature technologies known in the art, and will not be described in detail here.

[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A pressure swing adsorption inlet buffer tank condensate recovery mechanism, comprising a tank (1) for discharging condensate, characterized in that: A liquid level sensor (11) is installed on the upper surface of the tank (1), a liquid intake pipe (12) is fixedly connected to the lower surface of the tank (1), a flow regulating pipe (13) is fixedly connected to the lower surface of the liquid intake pipe (12), a branch pipe of the flow regulating pipe (13) is connected to a flow regulating mechanism (2), and a mixing mechanism (3) is provided on the lower side of the flow regulating mechanism (2). The flow regulation mechanism (2) includes an electric regulating valve (21), which reduces the pressure and regulates the flow rate of the flowing condensate fluid. The flow regulating mechanism (2) also includes a check valve (29) installed at the outlet end of the electric regulating valve (21). The mixing mechanism (3) includes a Venturi-type flow stabilizer (31) fixedly connected to the outlet end of the check valve (29). The lower surface of the Venturi-type flow stabilizer (31) is fixedly connected to a vortex housing (32) with a drain pipe. The inlet pipe end of the vortex housing (32) is fixedly connected to a parallel pipeline (33). The vortex housing (32) is rotatably connected to a vortex fan blade (34). A turbine generator (35) is provided on one side of the vortex housing (32). The inner surface of the vortex fan blade (34) is rotatably connected to a drive shaft (36) through a sealed bearing. The mixing mechanism (3) first uses the Venturi-type flow stabilizer (31) and the vortex shell (32) to perform high-intensity shear mixing of the pressure swing adsorption condensate and the naphtha from the inlet pipeline (33) to form a uniform pre-hydrogenated feedstock, which is then transported to the downstream device. At the same time, the mixing mechanism (3) uses the swirling flow formed by the mixed fluid to drive the turbine generator (35) to generate electricity, which is then used to supply the liquid level sensor (11), thus completing the recovery and self-utilization of the kinetic energy of the mixing process.

2. The pressure swing adsorption inlet buffer tank condensate recovery mechanism according to claim 1, characterized in that: The flow regulating mechanism (2) also includes a pressure reducing pipe (22) fixedly connected to the upper surface of the valve pipe of the electric regulating valve (21). The inlet end of the pressure reducing pipe (22) is directly connected to the main pipe of the flow regulating pipeline (13) at the front end of the inlet of the electric regulating valve (21) through a three-way fitting. The outlet end of the pressure reducing pipe (22) is fixedly connected to the upper surface of the valve body of the electric regulating valve (21).

3. The condensate recovery mechanism for a pressure swing adsorption inlet buffer tank according to claim 2, characterized in that: The flow regulating mechanism (2) further includes a primary cage pipe (23), a secondary cage pipe (24), and a tertiary cage pipe (25). The primary cage pipe (23) is fixedly installed in the internal cavity of the pressure reducing pipe (22), and its top end is fixedly connected to the branch pipe of the flow regulating pipeline (13) through a connecting pipe. The secondary cage pipe (24) is slidably sleeved on the outer periphery of the primary cage pipe (23), and the tertiary cage pipe (25) is slidably sleeved on the outer periphery of the secondary cage pipe (24), thereby forming a multi-stage sleeve structure that can be axially extended and retracted. The lower outer surfaces of the primary cage pipe (23) and the secondary cage pipe (24) are both fixedly sleeved with limiting rings (26). The outer peripheral wall of the limiting ring (26) is in sliding contact with the inner top wall of the sleeved secondary cage pipe (24) and the tertiary cage pipe (25), respectively.

4. The condensate recovery mechanism for a pressure swing adsorption inlet buffer tank according to claim 3, characterized in that: The flow regulating mechanism (2) also includes throttling holes (27) arranged in a ring array through the first-stage cage pipe (23), the second-stage cage pipe (24), and the third-stage cage pipe (25). The diameter of the three sets of throttling holes (27) increases sequentially from the first stage to the third stage. A buffer spring (28) is provided inside the first-stage cage pipe (23), with its upper end connected to the inner top wall of the first-stage cage pipe (23) and its lower end connected to the bottom of the third-stage cage pipe (25).

5. The condensate recovery mechanism for a pressure swing adsorption inlet buffer tank according to claim 4, characterized in that: The check valve (29) is a dual-mode self-sealing check valve (29), including a valve body (291), a secondary sealing layer (292) disposed at the valve seat of the valve body (291), and a main sealing layer (293).

6. The condensate recovery mechanism for a pressure swing adsorption inlet buffer tank according to claim 5, characterized in that: A driven gear (37) is fixedly sleeved on the outer surface of the output shaft of the turbine generator (35), and a driving gear (38) is fixedly sleeved on the outer surface of the drive shaft (36). The driving gear (38) meshes with the driven gear (37).

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