A device integrating gas-liquid separation and heat recovery structure

Abstract

This invention relates to the technical field of organic liquid hydrogen release equipment, and provides a device integrating gas-liquid separation and heat recovery structures. The device includes an outer shell containing a series of tubes; an inlet distributor at one end of the outer shell; a spiral guide plate inside the outer shell; an inlet and an outlet for the hydrogen-containing organic liquid on the outer shell; and a separation module at the other end of the outer shell. The separation module includes a separation module housing, a liquid outlet, and a hydrogen outlet pipe. The housing also contains several condenser tile modules, each with several condensate overflow holes and condenser tiles. This device, by optimizing the structure of the integrated gas-liquid heat exchanger and separator, effectively improves the energy recovery efficiency after dehydrogenation of the hydrogen-containing organic liquid, as well as the gas-liquid separation efficiency after dehydrogenation.

Description

Technical Field

[0001] This invention belongs to the technical field of organic liquid hydrogen release equipment, and particularly relates to a device that integrates gas-liquid separation and heat recovery structure. Background Technology

[0002] With the transformation of the global energy structure and the increasing demand for renewable energy, hydrogen energy, as a clean and efficient energy carrier, is receiving increasing attention. Hydrogen, as an energy source, possesses high energy density and clean combustion characteristics; however, the safety and efficiency of its storage and transportation have always been bottlenecks restricting its widespread application. Traditional methods for storing compressed and liquid hydrogen suffer from high costs and complex equipment.

[0003] Organic liquid hydrogen storage technology is a novel method for hydrogen storage. It utilizes the reaction of certain organic compounds with hydrogen to generate stable hydrides, which are then released as needed through the action of a catalyst. This method offers advantages such as high storage density, good safety, and simple equipment, making it a hot topic in the field of hydrogen energy storage. Liquid organic hydrogen carrier (LOHC) technology, with its high hydrogen storage density, stability at room temperature and pressure, and safe and environmentally friendly characteristics, has become a research focus in the field of hydrogen energy.

[0004] While liquid organic hydrogen carrier (LOHC) technology boasts advantages such as high hydrogen storage density, environmental friendliness, safety, and high efficiency, it still has some shortcomings. Among these, the high energy consumption for dehydrogenation is a significant issue hindering the promotion and development of LOHC technology. This is because the dehydrogenation process is an endothermic reaction that requires a large amount of heat, resulting in high energy costs. Therefore, reducing energy costs and recovering the waste heat from the organic liquid and hydrogen mixture after the reaction have become crucial for minimizing energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide a device that integrates gas-liquid separation and heat recovery structures, aiming to solve the problems mentioned in the background art.

[0006] The present invention is implemented as follows: a device integrating gas-liquid separation and heat recovery structure includes an outer shell, in which multiple tubes are arranged in a ring. The inlet end of the tubes is fixed to one end of the outer shell through an inlet tube fixing flange, and the outlet end of the tubes is fixed to the other end of the outer shell through an outlet tube fixing flange.

[0007] An inlet distributor is provided at one end of the outer shell near the inlet of the tubes. One end of the inlet distributor is connected to the organic liquid dehydrogenation reactor, and the other end of the inlet distributor is provided with multiple distributor outlets, and each distributor outlet is connected to the inlet end of each tube.

[0008] The interior of the outer shell is also provided with a spiral guide plate, and the spiral guide plate is provided with a number of mounting holes for matching the tubes;

[0009] A hydrogen-containing organic liquid inlet is provided on the side of the outer shell near the inlet of the tube, and the hydrogen-containing organic liquid inlet is connected to a hydrogen-containing organic liquid storage tank. A hydrogen-containing organic liquid outlet is provided on the side of the outer shell near the outlet of the tube, and the hydrogen-containing organic liquid outlet is connected to a heat exchanger.

[0010] A separation module is provided at one end of the outer shell near the outlet of the tube. The separation module includes a separation module housing, which is detachably installed at the end of the outer shell. The separation module housing is provided with a liquid outlet and a hydrogen outlet pipe. The liquid outlet is connected to an organic liquid recovery storage tank, and the hydrogen outlet pipe is connected to a hydrogen purification module. A condenser demister is provided inside the separation module housing at the connection point with the hydrogen outlet pipe. Several condenser tile modules are also provided inside the separation module housing. Several condenser tile modules are provided on the condenser tile modules, and several condenser tiles are provided on the side of the condenser tile modules away from the outer shell.

[0011] In a further technical solution, the condensing tile is made of a copper-zinc alloy (brass) with excellent thermal conductivity.

[0012] In a further technical solution, an inlet insulation shell is detachably installed at one end of the outer shell near the inlet distributor, and the interior of the inlet insulation shell is provided with a heat insulation layer.

[0013] A further technical solution is that an insulation shell flange is provided on one side of the inlet insulation shell, and the insulation shell flange is connected to the inlet tube fixing flange by fixing bolts.

[0014] In a further technical solution, a throttling module is provided at the connection between the distributor outlet and the tube set. The throttling module includes several throttling holes opened on the inlet tube fixed flange, and the distributor outlet is connected to the inlet of each tube set through the throttling holes.

[0015] In a further technical solution, a separation module flange is provided at one end of the separation module housing near the outer shell, and the separation module flange is connected to the outlet tube fixing flange by fixing bolts.

[0016] In a further technical solution, an overflow plate is provided at the flange of the separation module, and an overflow hole is provided on the overflow plate at the position corresponding to the tube.

[0017] This invention provides an integrated gas-liquid separation and heat recovery device. This device optimizes the integrated gas-liquid heat exchanger and separator structure, and improves the heat exchanger's operating conditions through numerical simulation and experimental measurements. This improves the heat transfer coefficient and reduces pressure drop. Furthermore, it optimizes the structural parameters of the integrated heat exchange and separation device, such as changing the structure of the gas-liquid mixture flow pipe and optimizing the heat exchanger shell-and-tube heat exchange efficiency. This effectively improves the energy recovery efficiency after dehydrogenation of hydrogen-containing organic liquids, as well as the gas-liquid separation efficiency after dehydrogenation. Attached Figure Description

[0018] Figure 1 A schematic diagram of a device integrating gas-liquid separation and heat recovery structure provided in an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of an organic liquid hydrogen release system;

[0020] Figure 3 for Figure 1 A schematic diagram of the AA section in the diagram;

[0021] Figure 4 for Figure 1 A structural schematic diagram of the BB cross section in the image;

[0022] Figure 5 for Figure 1 A schematic diagram of the CC section in the diagram;

[0023] Figure 6 for Figure 1 Enlarged view of point A in the image;

[0024] Figure 7 This is a simulation diagram of the turbulent separation effect of the condenser tile;

[0025] Figure 8 This is a three-dimensional structural diagram of the spiral guide plate;

[0026] Figure 9 Simulation of flow rate of hydrogen-containing organic liquid (LOHC+) in shell-side space;

[0027] Figure 10 This diagram illustrates the shell-side dead zone using a conventional bow-shaped baffle.

[0028] In the attached diagram: 1. Inlet insulation shell; 2. Insulation layer; 3. Inlet distributor; 4. Fixing bolt; 5. Insulation shell flange; 6. Inlet tube fixing flange; 7. Throttling module; 8. Tube; 9. Spiral guide plate; 10. Outer shell; 11. Hydrogen-containing organic liquid inlet; 12. Hydrogen-containing organic liquid outlet; 13. Outlet tube fixing flange; 14. Separation module flange; 15. Separated liquid outlet; 16. Separation module shell; 17. Condensation demister; 18. Hydrogen outlet pipe; 19. Hydrogen-containing organic liquid storage tank; 20. Heat exchanger; 21. Hydrogen purification module; 22. Organic liquid dehydrogenation reactor; 23. Organic liquid recovery storage tank; 24. Condensing tile module; 25. Condensing tile; 26. Throttling orifice; 27. Distributor outlet; 28. Overflow plate; 29. ​​Overflow hole; 30. Condensate overflow hole; P. Inlet pump; C. This device. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0030] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0031] like Figure 1-8 As shown, an integrated gas-liquid separation and heat recovery structure device is provided according to an embodiment of the present invention, including an outer shell 10. A plurality of tubes 8 are arranged in a ring inside the outer shell 10. The inlet end of the tubes 8 is fixed to one end of the outer shell 10 through an inlet tube fixing flange 6, and the outlet end of the tubes 8 is fixed to the other end of the outer shell 10 through an outlet tube fixing flange 13.

[0032] An inlet distributor 3 is provided at one end of the outer shell 10 near the inlet of the tube 8. One end of the inlet distributor 3 is connected to the organic liquid dehydrogenation reactor 22, and the other end of the inlet distributor 3 is provided with multiple distributor outlets 27, and each distributor outlet 27 is connected to the inlet end of each tube 8.

[0033] The outer casing 10 is also provided with a spiral guide plate 9, and the spiral guide plate 9 is provided with a plurality of mounting holes for matching the tube 8.

[0034] The outer shell 10 is provided with a hydrogen-containing organic liquid inlet 11 on the side near the inlet of the tube 8. The hydrogen-containing organic liquid inlet 11 is connected to the hydrogen-containing organic liquid storage tank 19. The outer shell 10 is provided with a hydrogen-containing organic liquid outlet 12 on the side near the outlet of the tube 8. The hydrogen-containing organic liquid outlet 12 is connected to the heat exchanger 20.

[0035] A separation module is provided at one end of the outer casing 10 near the outlet of the tube 8. The separation module includes a separation module housing 16, which is detachably installed at the end of the outer casing 10. The separation module housing 16 is provided with a liquid outlet 15 and a hydrogen outlet pipe 18. The liquid outlet 15 is connected to an organic liquid recovery storage tank 23, and the hydrogen outlet pipe 18 is connected to a hydrogen purification module 21. A condenser demister 17 is provided inside the separation module housing 16 at the connection point with the hydrogen outlet pipe 18. Several condenser tile modules 24 are also provided inside the separation module housing 16. Several condenser overflow holes 30 are opened on the condenser tile modules 24, and several condenser tiles 25 are provided on the side of the condenser overflow holes 30 away from the outer casing 10.

[0036] In this embodiment of the invention, in the technical schematic diagram of the organic liquid hydrogen release system, before the hydrogen-containing organic liquid (LOHC+) enters the organic liquid dehydrogenation reactor 22 for reaction, it needs to pass through the inlet pump P, this device (i.e., Figure 2 The shell side of C) and heat exchanger 20 (liquid path) are included. The hydrogen-containing organic liquid (LOHC+) undergoes sufficient heat exchange with the outer wall of the tube 8 through the spiral guide plate 9 in the shell side when passing through the device C, which can fully realize the recovery and utilization of gas path heat energy and reduce system energy loss.

[0037] Then, the hydrogen-containing organic liquid (LOHC+) enters the organic liquid dehydrogenation reactor 22, where the temperature often reaches around 280-290℃ during the dehydrogenation reaction. At this time, under the action of the catalyst, the hydrogen-containing organic liquid (LOHC+) produces dehydrogenated organic liquid (LOHC-) and hydrogen gas. A large amount of hydrogen gas and tiny droplets of organic liquid generated at high temperature accumulate in the gas phase space of the organic liquid dehydrogenation reactor 22, and this mixed gas carries a large amount of heat energy obtained from the reactor. The gas-liquid mixture flows along the gas path pipe, through the inlet distributor 3 and the distributor outlet 27, into the tube-side space of device C. The flow of the gas-liquid mixture in the tube 8 brings it into contact with the inner wall of the tube 8, transferring heat through the inner wall to the shell-side space of the outer wall of the tube 8. The shell-side space of this device C is filled with hydrogen-containing organic liquid (LOHC+) flowing uniformly in the spiral guide plate 9. Through heat transfer between the hydrogen-containing organic liquid (LOHC+) and the outer wall of the tube 8, heat is transferred to the hydrogen-containing organic liquid (LOHC+) in the shell-side space, realizing heat recovery and preheating the hydrogen-containing organic liquid (LOHC+) before the hydrogen release reaction, reducing the energy required to heat the reactor to the dehydrogenation reaction temperature.

[0038] Meanwhile, through the cooling of the inner wall of tube 8, the tiny organic liquid droplets in the gas-liquid mixture, due to heat loss and continuous impact, converge into larger droplets. Under the influence of gravity, these larger droplets coalesce into organic liquid, flowing forward at the bottom of tube 8 in the direction of gravity, while hydrogen separates from the mixture. The converged organic liquid flows out of tube 8 and into the separation module housing 16, then flows into the organic liquid recovery storage tank 23 through the separated liquid outlet 15. Simultaneously, because hydrogen has a lower density, it enters the separation module housing 16 forward and upward. To better and more thoroughly separate the extremely small droplets in the mixture, a condensing tile 25 is added. This structure is made of a copper-zinc alloy (brass) with excellent thermal conductivity. The separated hydrogen passes through the condensate overflow hole 30 and undergoes gas-liquid separation with the condensing tile 25. The condensing tile 25 turbulently condenses the mixture, causing extremely small droplets to adhere to its surface. As tiny droplets accumulate on the condenser tile 25, they slowly slide down and drip under the influence of gravity, flowing into the liquid outlet 15 and then out of the device. The hydrogen gas then enters the hydrogen purification module 21 through the condenser demister 17 (which is made of magnesium-aluminum alloy and also has the function of condensation and separation) and the hydrogen outlet pipe 18.

[0039] Furthermore, the attached diagram only shows the structure of the condenser tile 25 and does not represent the actual number arranged. The actual arrangement of the condenser tile 25 needs to be increased according to actual requirements to achieve better gas-liquid separation.

[0040] like Figure 1 As shown, in a preferred embodiment of the present invention, an inlet insulation shell 1 is detachably installed at one end of the outer shell 10 near the inlet distributor 3, and an insulation layer 2 is provided inside the inlet insulation shell 1.

[0041] In this embodiment of the invention, an insulation shell flange 5 is provided on one side of the inlet insulation shell 1, and the insulation shell flange 5 is connected to the inlet tube fixing flange 6 by fixing bolts 4. By providing the inlet insulation shell 1 and the heat insulation layer 2, heat loss of the gas-liquid mixture in the distributor 3 can be prevented.

[0042] like Figure 1 and 3 As shown, in a preferred embodiment of the present invention, a throttling module 7 is also provided at the connection between the distributor outlet 27 and the tube 8. The throttling module 7 includes a plurality of throttling holes 26 opened on the inlet tube fixing flange 6, and the distributor outlet 27 is connected to the inlet of each tube 8 through the throttling holes 26.

[0043] In this embodiment of the invention, by setting throttling orifices 26 with uniform aperture size, the mixed gas can enter the tube 8 evenly, which can make the heat of each tube 8 evenly distributed and more conducive to heat energy recovery.

[0044] like Figure 1 As shown, in a preferred embodiment of the present invention, a separation module flange 14 is provided at one end of the separation module housing 16 near the outer shell 10, and the separation module flange 14 is connected to the outlet tube fixing flange 13 by fixing bolts 4.

[0045] like Figure 1 and 5 As shown, in a preferred embodiment of the present invention, an overflow plate 28 is also provided at the flange 14 of the separation module, and an overflow hole 29 is provided on the overflow plate 28 at a position corresponding to the tube 8.

[0046] In this embodiment of the invention, the overflow hole 29 is used to allow the collected organic liquid to pass through and flow into the separation module housing 16.

[0047] Under the same system conditions, this device was compared with a traditional gas-liquid separator (fixed tank type) under the same reaction conditions. The comparison results are shown in Tables 1 and 2 below.

[0048] Table 1

[0049] Hydrogen percentage at separator outlet 89％ 98.1％ Traditional gas-liquid separator (cyclone type) This invention Hydrogen percentage at separator outlet 93％ 98.6％

[0050] Table 2

[0051]

[0052] It is evident that, under the same reaction conditions, using this device can improve hydrogen separation by 5-10%. Simultaneously, the application of the spiral guide plate significantly improves heat recovery efficiency and reduces operating costs.

[0053] In addition, combined Figure 9 and Figure 10 It is evident that, compared to the dead zone in the shell side of the traditional bow-shaped baffle, the spiral guide plate used in this device has virtually no dead zone.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device integrating gas-liquid separation and heat recovery structures, characterized in that, The device includes an outer shell, in which multiple tubes are arranged in a ring. The inlet end of each tube is fixed to one end of the outer shell via an inlet tube fixing flange, and the outlet end of each tube is fixed to the other end of the outer shell via an outlet tube fixing flange. An inlet distributor is provided at one end of the outer shell near the inlet of the tubes. One end of the inlet distributor is connected to the organic liquid dehydrogenation reactor, and the other end of the inlet distributor is provided with multiple distributor outlets, and each distributor outlet is connected to the inlet end of each tube. The interior of the outer shell is also provided with a spiral guide plate, and the spiral guide plate is provided with a number of mounting holes for matching the tubes; A hydrogen-containing organic liquid inlet is provided on the side of the outer shell near the inlet of the tube, and the hydrogen-containing organic liquid inlet is connected to a hydrogen-containing organic liquid storage tank. A hydrogen-containing organic liquid outlet is provided on the side of the outer shell near the outlet of the tube, and the hydrogen-containing organic liquid outlet is connected to a heat exchanger. A separation module is provided at one end of the outer shell near the outlet of the tube. The separation module includes a separation module housing, which is detachably installed at the end of the outer shell. The separation module housing is provided with a liquid outlet and a hydrogen outlet pipe. The liquid outlet is connected to an organic liquid recovery storage tank, and the hydrogen outlet pipe is connected to a hydrogen purification module. A condenser demister is provided inside the separation module housing at the connection point with the hydrogen outlet pipe. Several condenser tile modules are also provided inside the separation module housing. Several condenser tile modules are provided on the condenser tile modules, and several condenser tiles are provided on the side of the condenser tile modules away from the outer shell.

2. The device with integrated gas-liquid separation and heat recovery structure according to claim 1, characterized in that, The condensing tile is made of copper-zinc alloy.

3. The device with integrated gas-liquid separation and heat recovery structure according to claim 1, characterized in that, An inlet insulation shell is detachably installed at one end of the outer shell near the inlet distributor, and the interior of the inlet insulation shell is provided with a heat insulation layer.

4. The device with integrated gas-liquid separation and heat recovery structure according to claim 3, characterized in that, An insulation shell flange is provided on one side of the inlet insulation shell, and the insulation shell flange is connected to the inlet tube fixing flange by fixing bolts.

5. The device for integrating gas-liquid separation and heat recovery structure according to claim 1, characterized in that, A throttling module is also provided at the connection between the distributor outlet and the tube set. The throttling module includes several throttling holes opened on the inlet tube fixed flange, and the distributor outlet is connected to the inlet of each tube set through the throttling holes.

6. The device for integrating gas-liquid separation and heat recovery structure according to claim 1, characterized in that, The separation module housing is provided with a separation module flange at one end near the outer shell, and the separation module flange is connected to the outlet tube fixing flange by fixing bolts.

7. The device for integrating gas-liquid separation and heat recovery structure according to claim 6, characterized in that, An overflow plate is also provided at the flange of the separation module, and an overflow hole is provided on the overflow plate at the position corresponding to the tube.

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