Device for improving permeability of secondary membrane

Abstract

The utility model provides a device for improving the permeability of a secondary membrane, which comprises a primary membrane unit, a dehydration unit and a secondary membrane unit, the primary membrane unit is provided with a feed gas inlet, a gas outlet on the primary membrane unit is connected with an inlet of the dehydration unit, an outlet of the dehydration unit is connected with a gas inlet of the secondary membrane unit, and a conduction oil heat tracing system is arranged on a connecting pipeline between the dehydration unit and the secondary membrane unit. According to the utility model, the temperature of raw gas of the same membrane is increased within an allowable range, so that the permeation efficiency of the secondary membrane is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to helium production technical field, specifically a device of improving secondary membrane permeation rate. BACKGROUND

[0002] Helium gas plays an intuitive important role in the key field concerning national security and development, for example: in the aerospace field as the cleaning medium and pressurized propellant in the rocket liquid hydrogen fuel system. In the diving field as the exhalation mixed gas of deep water operation, in the high-precision field as the heat transfer medium and low-temperature cooling medium. China is a big helium user, and the import accounts for more than 95%, helium has become a "neck" resource.

[0003] In the helium extraction process of two-stage membrane separation + pressure swing adsorption, the principle of membrane separation is used to extract helium. The basic principle of membrane separation can be understood as follows: the membrane separation device realizes gas separation by using the difference in the permeation rate of each component in the gas mixture in the membrane under the action of the pressure difference on both sides of the membrane. The fast-permeating component (fast gas) is enriched on the permeation side, and the slow-permeating component (slow gas) stays on the raw material side.

[0004] However, it is found that the yield of helium extraction during the day is higher than that at night, especially in cold weather such as snow, the yield is sharply reduced, so it is inferred that the permeation amount of the membrane separation device is affected by temperature. Therefore, it is urgent to take effective temperature control measures for the membrane separation device.

[0005] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the present utility model, and should not be construed as recognition or suggestion that this information constitutes prior art known to those of ordinary skill in the art. SUMMARY

[0006] The utility model aims at providing a device of improving secondary membrane permeation rate, which solves the defect of low helium extraction efficiency.

[0007] In order to achieve the above purpose, the utility model adopts the technical scheme of:

[0008] The device of improving secondary membrane permeation rate comprises a primary membrane unit, a dehydration unit and a secondary membrane unit, a raw gas inlet is arranged on the primary membrane unit, a gas outlet on the primary membrane unit is connected with the inlet of the dehydration unit, the outlet of the dehydration unit is connected with the gas inlet of the secondary membrane unit, and a heat conduction oil tracing system is arranged on the connecting pipeline between the dehydration unit and the secondary membrane unit.

[0009] Preferably, the connecting pipeline is divided into three sections, namely a dewatering outlet section, a transition section and a secondary membrane inlet section, and the dewatering outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure.

[0010] Preferably, the heat conduction oil heating system comprises a heat conduction oil heating device and a heat conduction oil heating pipeline, wherein the heat conduction oil outlet and inlet of the heat conduction oil heating device are respectively connected with the heat conduction oil outlet and inlet of the heat conduction oil heating pipeline; and the heat conduction oil heating pipeline is arranged in the dewatering outlet section and the transition section.

[0011] Preferably, the heat conduction oil heating system comprises a heat conduction oil heating device, a first heating end and a second heating end, wherein the heat conduction oil outlet of the heat conduction oil heating device is connected with the first heating end, the heat conduction oil outlet of the first heating end is divided into two paths, one path is connected with the heat conduction oil inlet of the heat conduction oil heating device, and the other path is connected with the second heating end, the heat conduction oil outlet of the second heating end is connected with the heat conduction oil inlet of the heat conduction oil heating device; and the two heating ends are respectively sleeved on the dewatering outlet section and the transition section.

[0012] Preferably, the device further comprises an electromagnetic heater, which is arranged on the outer wall of the connecting pipeline in the secondary membrane inlet section and close to the side of the gas inlet of the secondary membrane unit.

[0013] Preferably, the device further comprises an electromagnetic heater, which is arranged on the outer wall of the connecting pipeline in the secondary membrane inlet section.

[0014] Preferably, the device further comprises a controller, wherein an input end of the controller is connected with a temperature sensor for detecting the temperature of the gas in the connecting pipeline, and the controller is used for controlling the start and stop of the heat conduction oil heating system according to the detected temperature.

[0015] Preferably, the connecting pipeline is divided into three sections, namely a dewatering outlet section, a transition section and a secondary membrane inlet section, and the dewatering outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure;

[0016] The heat conduction oil heating system comprises a heat conduction oil heating device and a heat conduction oil heating pipeline, wherein the heat conduction oil outlet and inlet of the heat conduction oil heating device are respectively connected with the heat conduction oil outlet and inlet of the heat conduction oil heating pipeline; and the heat conduction oil heating pipeline is arranged in the dewatering outlet section and the transition section.

[0017] The device further comprises an electromagnetic heater, which is arranged on the outer wall of the connecting pipeline in the secondary membrane inlet section and close to the side of the gas inlet of the secondary membrane unit.

[0018] Preferably, the connecting pipeline is divided into three sections, namely a dewatering outlet section, a transition section and a secondary membrane inlet section, and the dewatering outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure;

[0019] The heat conducting oil heating system comprises a heat conducting oil heating device, a first heating end and a second heating end, wherein the heat conducting oil outlet of the heat conducting oil heating device is connected with the first heating end, the heat conducting oil outlet of the first heating end is divided into two paths, one path is connected with the heat conducting oil inlet of the heat conducting oil heating device, and the other path is connected with the second heating end, the heat conducting oil outlet of the second heating end is connected with the heat conducting oil inlet of the heat conducting oil heating device, and the two heating ends are respectively sleeved on the dehydration outlet section and the transition section.

[0020] The device further comprises an electromagnetic heater arranged on the outer wall of the connecting pipeline at the secondary membrane inlet section.

[0021] Preferably, the connecting pipeline is divided into three sections, namely a dehydration outlet section, a transition section and a secondary membrane inlet section, which are sequentially connected to form a U-shaped structure.

[0022] The heat conducting oil heating system comprises a heat conducting oil heating device, a first heating end and a second heating end, wherein the heat conducting oil outlet of the heat conducting oil heating device is connected with the first heating end, the heat conducting oil outlet of the first heating end is divided into two paths, one path is connected with the heat conducting oil inlet of the heat conducting oil heating device, and the other path is connected with the second heating end, the heat conducting oil outlet of the second heating end is connected with the heat conducting oil inlet of the heat conducting oil heating device, and the two heating ends are respectively sleeved on the dehydration outlet section and the transition section.

[0023] The device further comprises an electromagnetic heater arranged on the outer wall of the connecting pipeline at the secondary membrane inlet section.

[0024] Compared with the prior art, the device has the following beneficial effects:

[0025] The device for improving the permeation rate of the secondary membrane heats the gas in the connecting pipeline between the dehydration unit and the secondary membrane unit by using the heat conducting oil heating system, thereby improving the temperature of the same kind of membrane raw gas as much as possible within the allowable range, and improving the permeation efficiency of the secondary membrane. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a process schematic diagram of a two-stage membrane separation helium extraction process by pressure swing adsorption;

[0027] Figure 2 is a first structure schematic diagram of the device for improving the permeation rate of the secondary membrane;

[0028] Figure 3 is a second structure schematic diagram of the device for improving the permeation rate of the secondary membrane;

[0029] Wherein, 11, first heating end; 12, second heating end; 13, heat conducting oil heating device; 14, heat conducting oil heat tracing pipeline; 2, electromagnetic heater; 3, connecting pipeline; 31, dewatering device outlet section; 32, transition section; 33, two-stage membrane device inlet section; 4, primary membrane unit; 5, secondary membrane unit; 6, dewatering unit. DETAILED DESCRIPTION

[0030] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, circuits, and

[0031] It will be understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0032] It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0033] As used in this specification and claims, the terms "if" and "when" can be construed to mean "when" or "if," depending on the context. Similarly, the phrase "if it is determined" or "if it is detected" can be construed to mean "once it is determined" or "in response to a determination," or "once it is detected" or "in response to a detection," depending on the context.

[0034] In addition, the terms "first," "second," "third," etc. are used herein only to describe different aspects of the application and are not intended to denote relative importance of the different aspects.

[0035] Reference throughout this application to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," and the like in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to any one of the particular six embodiments described below. Rather, these are used synonymously to describe one or more embodiments or examples pertaining to the present application.

[0036] Embodiment 1

[0037] The utility model provides a device of promoting secondary membrane permeation rate, including primary membrane unit 4, dehydration unit 6 and secondary membrane unit 5, wherein, the raw material gas import is set up on primary membrane unit, the gas outlet on primary membrane unit is connected the import of dehydration unit, the outlet of dehydration unit is connected the gas import of secondary membrane unit.

[0038] The connecting pipeline 3 between the import of secondary membrane unit and the outlet of dehydration unit is pasted with heat conducting oil heat tracing system, to increase the temperature inside the connecting pipeline.

[0039] The connecting pipeline 3 is divided into three sections, is dehydration outlet section 31, transition section 32 and secondary membrane inlet section 33 respectively, dehydration outlet section 31, transition section 32 and secondary membrane inlet section 33 are connected in turn, form U type structure.

[0040] The heat conducting oil heat tracing system includes first heating end 11 and second heating end 12, and two heating ends are pasted with dehydration outlet section 31 and transition section 32 respectively.

[0041] The heat conducting oil heat tracing system is the sleeve type heat conducting oil heat tracing system, and the two heating ends are sleeve type heating ends, and the first heating end 11 and the second heating end are separately sleeved in dehydration outlet section 31 and transition section 32.

[0042] The working process of the embodiment:

[0043] Gas flows from raw material gas heater into primary membrane unit, then into dehydration unit for dehydration, and then heated by heat conducting oil heat tracing system, and then into secondary membrane unit for further enrichment.

[0044] The reason for arranging the connecting pipeline in a U shape is that the pipeline will expand due to the high temperature of the gas transported in the pipeline, and the U-shaped pipeline can compensate for the thermal expansion. At the same time, considering that the overall helium extraction process equipment is relatively large, the U-shaped pipeline can provide sufficient heating path for the gas while effectively reducing the floor area.

[0045] The two heating ends of the heat conducting oil heating system are respectively attached to the outlet section 31 of the dehydration device and the transition section 32, so as to heat the gas in the pipeline. Since the inlet section 33 of the secondary membrane device is directly connected to the secondary membrane device, if a heating end is arranged to heat it, the temperature of the gas may be too high, which may cause the impurity gas in the product gas to exceed the standard.

[0046] Embodiment 2

[0047] On the basis of embodiment 1, the device for improving the permeation rate of the secondary membrane provided in this embodiment further comprises an electromagnetic heater 2, which is installed on the inlet section 33 of the secondary membrane and is close to the gas inlet side of the secondary membrane device, so as to heat the gas entering the secondary membrane unit again.

[0048] Since the inlet section 33 of the secondary membrane device cannot be provided with a heating end of the heat conducting oil heating system, but the temperature of the gas may drop when flowing through this place due to external environment or other reasons, the electromagnetic heater 2 can heat at this place to prevent the temperature of the gas from dropping at the inlet section 33 of the secondary membrane device.

[0049] Embodiment 3

[0050] On the basis of embodiment 1, the device for improving the permeation rate of the secondary membrane provided in this embodiment further comprises an electromagnetic heater 2, which is arranged on the outer wall of the connecting pipeline of the inlet section of the secondary membrane, so as to heat the gas entering the secondary membrane unit again.

[0051] The electromagnetic heater 2 is a variable frequency heater, which is used to control the temperature stability of the gas in the secondary membrane unit.

[0052] Embodiment 4

[0053] On the basis of embodiment 1, the device for improving the permeation rate of the secondary membrane provided in this embodiment further comprises a controller, the input end of the controller is connected with a temperature sensor, and the output end of the controller is connected with the heat conducting oil heating system.

[0054] The temperature sensor is used to detect the temperature of the gas in the connecting pipeline 3, and the controller is used to control the start and stop of the heat conducting oil heating system according to the detected temperature, so as to control the temperature of the gas in the pipeline to always maintain the optimal permeation rate temperature of the secondary membrane device.

[0055] Due to the temperature difference between day and night, the temperature of the gas in the pipeline also changes, and the temperature sensor can adjust the temperature of the heat transfer oil in the heat tracing system according to the temperature of the gas in the pipeline. In the daytime, the temperature of the heat transfer oil is relatively reduced, and in the night, the temperature of the heat transfer oil is relatively increased, so as to reduce the excessive heating of the gas by the heat tracing system, and to reduce the waste of unnecessary heat generated by the excessive heating of the gas. At the same time, within the allowable range, the temperature of the same membrane raw material gas is as high as possible, which is beneficial to improve the permeation efficiency. However, blindly increasing the temperature may accelerate the thermal motion of molecules in each component of the gas, thereby causing the impurity gas in the product gas to exceed the standard.

[0056] Example 5

[0057] As shown in Figure 3 , based on example 1, the device for improving the permeation rate of the secondary membrane provided in this embodiment, the heat tracing system of the heat transfer oil includes a heat transfer oil heating device 13, a first heating end and a second heating end, wherein the heat transfer oil outlet of the heat transfer oil heating device 13 is connected to the first heating end, the heat transfer oil outlet of the first heating end is divided into two ways, one way is connected to the heat transfer oil inlet of the heat transfer oil heating device 13, and the other way is connected to the second heating end, the heat transfer oil outlet of the second heating end is connected to the heat transfer oil inlet of the heat transfer oil heating device 13; both heating ends are sleeve structures, and the two heating ends are respectively sleeved on the dehydration outlet section and the transition section.

[0058] The sleeve completely wraps the secondary membrane device inlet section 33 and the dehydration device outlet section 31 of the pipeline, so as to realize more stable heating effect. The results show that the average temperature of the secondary membrane raw material gas is stably above 78℃, and at the same time, the dehydration device raw material gas temperature is free from the influence of the dehydration device raw material gas temperature, so as to stably and effectively improve the yield (the yield is improved by 50%).

[0059] Example 6

[0060] As shown in Figure 2 , based on example 1, the device for improving the permeation rate of the secondary membrane provided in this embodiment, the heat tracing system of the heat transfer oil includes a heat transfer oil heating device 13 and a heat tracing pipeline of the heat transfer oil, wherein the heat transfer oil inlet and outlet of the heat transfer oil heating device 13 are respectively connected to the heat transfer oil outlet and inlet of the heat tracing pipeline of the heat transfer oil; the heat tracing pipeline of the heat transfer oil is arranged in the dehydration outlet section and the transition section.

[0061] The gas in the dehydration outlet section and the transition section is heated by the heat tracing method.

[0062] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. An apparatus for enhancing the permeability of a secondary membrane, the apparatus comprising: The device comprises a primary membrane unit, a dehydration unit and a secondary membrane unit, a raw material gas inlet is arranged on the primary membrane unit, a gas outlet of the primary membrane unit is connected with an inlet of the dehydration unit, an outlet of the dehydration unit is connected with a gas inlet of the secondary membrane unit, and a heat conduction oil heating system is arranged on a connecting pipeline between the dehydration unit and the secondary membrane unit.

2. The device of claim 1, wherein, The connecting pipeline is divided into three sections, namely a dehydration outlet section, a transition section and a secondary membrane inlet section, and the dehydration outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure.

3. The device of claim 2, wherein, The heat conduction oil heating system comprises a heat conduction oil heating device and a heat conduction oil heating pipeline, the heat conduction oil inlet and outlet of the heat conduction oil heating device are respectively connected with the heat conduction oil outlet and inlet of the heat conduction oil heating pipeline, and the heat conduction oil heating pipeline is arranged in the dehydration outlet section and the transition section.

4. The device of claim 2, wherein, The heat conduction oil heating system comprises a heat conduction oil heating device, a first heating end and a second heating end, the heat conduction oil outlet of the heat conduction oil heating device is connected with the first heating end, the heat conduction oil outlet of the first heating end is divided into two paths, one path is connected with the heat conduction oil inlet of the heat conduction oil heating device, the other path is connected with the second heating end, the heat conduction oil outlet of the second heating end is connected with the heat conduction oil inlet of the heat conduction oil heating device, and the two heating ends are respectively sleeved on the dehydration outlet section and the transition section.

5. The device of claim 1, wherein, The device further comprises an electromagnetic heater, which is arranged in the secondary membrane inlet section of the connecting pipeline and close to one side of the gas inlet of the secondary membrane unit.

6. The device of claim 1, wherein, The device further comprises an electromagnetic heater, which is arranged on the outer wall of the secondary membrane inlet section of the connecting pipeline.

7. The device for enhancing the permeate flux of a secondary membrane according to any one of claims 1 to 4, wherein The device further comprises a controller, an input end of the controller is connected with a temperature sensor for detecting the temperature of the gas in the connecting pipeline, and the controller is used for controlling the start and stop of the heat conduction oil heating system according to the detected temperature.

8. The device of claim 1, wherein, The connecting pipeline is divided into three sections, namely a dehydration outlet section, a transition section and a secondary membrane inlet section, and the dehydration outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure. The heat conduction oil heating system comprises a heat conduction oil heating device and a heat conduction oil heating pipeline, the heat conduction oil inlet and outlet of the heat conduction oil heating device are respectively connected with the heat conduction oil outlet and inlet of the heat conduction oil heating pipeline, and the heat conduction oil heating pipeline is arranged in the dehydration outlet section and the transition section. The device further comprises an electromagnetic heater, which is arranged in the secondary membrane inlet section of the connecting pipeline and close to one side of the gas inlet of the secondary membrane unit.

9. The device of claim 1, wherein, The connecting pipeline is divided into three sections, namely a dehydration outlet section, a transition section and a secondary membrane inlet section, and the dehydration outlet section, the transition section and the secondary membrane inlet section are sequentially connected to form a U-shaped structure. The heat conduction oil heating system comprises a heat conduction oil heating device, a first heating end and a second heating end, the heat conduction oil outlet of the heat conduction oil heating device is connected with the first heating end, the heat conduction oil outlet of the first heating end is divided into two paths, one path is connected with the heat conduction oil inlet of the heat conduction oil heating device, the other path is connected with the second heating end, the heat conduction oil outlet of the second heating end is connected with the heat conduction oil inlet of the heat conduction oil heating device, and the two heating ends are respectively sleeved on the dehydration outlet section and the transition section. The device further comprises an electromagnetic heater arranged at the secondary membrane inlet section of the connecting pipeline and close to the gas inlet side of the secondary membrane unit.

10. The device of claim 1, wherein, The connecting pipeline is divided into three sections, namely a dewatering outlet section, a transition section and a secondary membrane inlet section, which are sequentially connected to form a U-shaped structure. The heat conducting oil heating system comprises a heat conducting oil heating device, a first heating end and a second heating end, wherein the heat conducting oil outlet of the heat conducting oil heating device is connected to the first heating end, the heat conducting oil outlet of the first heating end is divided into two paths, one of which is connected to the heat conducting oil inlet of the heat conducting oil heating device, and the other of which is connected to the second heating end, the heat conducting oil outlet of the second heating end is connected to the heat conducting oil inlet of the heat conducting oil heating device, and the two heating ends are respectively sleeved on the dewatering outlet section and the transition section. The device further comprises an electromagnetic heater arranged on the outer wall of the secondary membrane inlet section of the connecting pipeline.

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