CN216737597U - Device for purifying helium by combining multistage membrane treatment and pressure swing adsorption - Google Patents
Device for purifying helium by combining multistage membrane treatment and pressure swing adsorption Download PDFInfo
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- CN216737597U CN216737597U CN202220511686.0U CN202220511686U CN216737597U CN 216737597 U CN216737597 U CN 216737597U CN 202220511686 U CN202220511686 U CN 202220511686U CN 216737597 U CN216737597 U CN 216737597U
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Abstract
The utility model discloses a device for purifying helium by combining multistage membrane treatment and pressure swing adsorption, which comprises a gas port for inputting gas and a membrane purification assembly; the membrane purification assembly comprises a drying filter group, a membrane group and a booster compressor. The gas to be purified is input into the drying filter group from the gas port, enters the inside of the membrane group after passing through the drying filter group, is separated from other gases after being screened by the permeation rate of the membrane, the separated helium is input into the next-stage booster compressor and the next-stage membrane purification assembly from the permeation gas outlet end for further purification treatment, and the helium purified by the multistage membrane purification assembly is purified by the single-stage pressure swing adsorption assembly to obtain the high-purity helium. The helium purity of this device purification is high to the wasting of resources is few, solves the problem that current helium purification can't realize high purity and high recovery simultaneously.
Description
Technical Field
The utility model relates to a helium purifying device, in particular to a device for purifying helium by combining multistage membrane treatment and pressure swing adsorption.
Background
Extraction of helium from natural gas is currently the primary source of helium production. The helium content in natural gas varies greatly from the lowest ppm level to the highest of 7.5%. This content is about 1.5 ten thousand times the helium content of air. Although small amounts of helium product can be extracted at large cryogenic air separation plants in China, it cannot be the dominant source of helium product and must still rely on extraction from natural gas.
In recent years, as helium as a strategic resource, China increasingly pays more attention to the research of a process method for extracting helium from natural gas, and the utility model patent ZL 201210513423.4 natural gas low-temperature helium extraction system and method discloses a method for purifying helium at low temperature. Because of the coexistence of helium and hydrogen in natural gas and the similar properties of the two gases, the cryogenic separation process is difficult to separate hydrogen and helium, and the recovery rate of helium is low.
The Chinese utility model 'ZL 201920385942.4 flash evaporation gas recovery device of liquefied natural gas' discloses a membrane separation, dehydrogenation and low-temperature condensation process, but the two-stage membranes of the scheme adopt a direct series connection mode, and the required membrane separation pressure is higher; the published technology, a method for purifying and preparing high-purity helium from liquefied natural gas, application No. 202110787496.1, discloses a method for purifying helium from liquefied natural gas, which adopts the processes of multistage dehydrogenation, deoxidation and two-stage pressure swing adsorption, and cannot realize high purity and high recovery rate of helium at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a device for purifying helium by combining multistage membrane treatment and pressure swing adsorption, which solves the problem that the existing helium purification cannot realize high purity and high recovery rate at the same time.
The utility model is realized by the following technical scheme:
a device for purifying helium by combining multistage membrane treatment and pressure swing adsorption comprises a gas port for inputting gas and a membrane purification assembly; the membrane purification assembly comprises a drying filter group, a membrane group and a booster compressor, wherein the input end of the drying filter group is used as the input end of the membrane purification assembly to be connected with the output end of the gas port, the output end of the drying filter group is connected with the input end of the membrane group, the output end of the membrane group is connected with the input end of the booster compressor, the output end of the booster compressor is used as the output end of the membrane purification assembly to be connected with the input end of the pressure swing adsorption purification assembly, and the output end of the pressure swing adsorption purification assembly is connected with the gas collection part; the output end of the membrane group is a permeation gas outlet end.
The device is used as follows: firstly, gas to be purified is input into a drying filter group from a gas port, the gas passes through the drying filter group and then enters the inside of a membrane group, helium and other gases are separated after the permeation rate of the membrane group is screened, the separated helium is input into a booster compressor from a permeation gas outlet end at low pressure, the helium enters a next-stage membrane purification assembly after being subjected to booster compression, further purification treatment is carried out, the helium reaches the helium concentration acceptable by a pressure swing adsorption purification assembly, the helium is compressed by the booster compressor, the helium output by the booster compressor is purified again by the pressure swing adsorption purification assembly, and finally, the purified helium product is collected. The helium gas purified by the device has high purity, the helium gas resource waste is less, and the problem that the existing helium gas purification cannot realize high purity and high recovery rate at the same time is solved.
Furthermore, in order to ensure the purity of purification, the membrane purification assemblies are at least provided with three groups, and the input ends and the output ends between the membrane purification assemblies are connected end to end.
Further, in order to ensure the function of purifying nitrogen. The membrane group comprises a single hollow fiber membrane or a plurality of hollow fiber membranes which are connected in parallel.
Further, in order to ensure recovery of valuable non-permeate side gas. One side of the membrane group is also provided with an outlet recovery end of the non-permeable gas.
Further, the pressure swing adsorption purification assembly is provided with a desorption gas outlet end. The input end of the booster compressor for connecting the first-stage membrane purification assembly is used for carrying out circulating recovery treatment, so that the recovery rate of helium is greatly improved.
Furthermore, in order to ensure the continuous operation of the adsorption and desorption processes of the adsorption tower of the pressure swing adsorption purification device, the pressure swing adsorption purification assembly at least comprises two or more adsorption towers.
Further, the gas input is conveniently controlled. The gas port for inputting gas is provided with a switch valve.
Further, the gas input by the gas port is the processed gas. The gas treatment mainly comprises the removal of harmful impurities and a large amount of water.
Further, in order to meet the requirement of the user on the helium pressure, the output end of the pressure swing adsorption device assembly can be connected with a helium compressor to obtain different pressure levels.
Further, the drying part of the drying filter bank is dried using chilled water cooling or freeze dryer.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
a device for purifying helium by combining multistage membrane treatment and pressure swing adsorption comprises a membrane purification assembly which is progressive layer by layer, and high purity of helium purification is realized.
A device for purifying helium by combining multi-stage membrane treatment and pressure swing adsorption forms a semi-closed loop circulating purification system, and ensures high recovery rate of helium.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:
FIG. 1 is a schematic view of a connection structure of the whole apparatus according to an embodiment of the present invention;
reference numbers and corresponding part names in the drawings:
1-gas port, 2-membrane purification component, 201-drying filter group, 202-membrane group, 203-booster compressor, 3-switch valve, 4-pressure swing adsorption purification component and 5-helium compressor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the utility model. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example 1
This example 1 provides an apparatus for purifying helium by combining multi-stage membrane process and pressure swing adsorption, as shown in fig. 1, comprising a gas port 1 for inputting gas and a membrane purification module 2; the membrane purification assembly 2 comprises a drying filter group 201, a membrane group 202 and a booster compressor 203, wherein the input end of the drying filter group 201 is used as the input end of the membrane purification assembly 2 to be connected with the output end of the gas port 1, the output end of the drying filter group 201 is connected with the input end of the membrane group 202, the output end of the membrane group 202 is connected with the input end of the booster compressor 203, the output end of the booster compressor 203 is used as the output end of the membrane purification assembly 2 to be connected with the input end of the pressure swing adsorption purification assembly 4, and the output end of the pressure swing adsorption purification assembly 4 is connected with a gas collection part; the output end of the membrane module 202 is the permeate gas outlet end.
The device is used as follows: firstly, gas to be purified is input into a drying filter group 201 from a gas port 1, the gas passes through the drying filter group 201 and then enters the inside of a membrane group 202, helium is separated from other gases after the filtration rate of the membrane group 202 is screened, the separated helium is input into a booster compressor 203 from a permeation gas outlet end at low pressure, the helium enters a next-stage membrane purification assembly 2 after being subjected to booster compression, further purification treatment is carried out, the helium reaches the helium concentration acceptable by a pressure swing adsorption purification assembly 4 and then is compressed by the booster compressor 203, the helium output from the inside of the booster compressor 203 is purified again by the pressure swing adsorption purification assembly 4, and finally, the purified helium product is collected. The helium gas purified by the device has high purity, less resource waste and solves the problem that the existing helium gas purification can not realize high purity and high recovery rate at the same time.
The principle of the physical process of membrane permeation gas separation, for example, nitrogen, oxygen and moisture in air, have different permeation rates for membrane materials, and generally, the permeation rate is fast, which can be called "fast gas", for example, very trace amounts of hydrogen and helium are both fast gases, and the fast and slow permeation rates can screen the gases. The gas passing through the permeate is usually a fast gas enrichment accompanied by a permeate side pressure reduction. The driving force of the physical process of membrane permeation gas separation is the pressure difference between two sides of the membrane material wall surface.
In this embodiment, at least three sets of membrane purification modules 2 are provided, and the input ends and the output ends between the membrane purification modules 2 are connected end to end. And a plurality of groups are arranged to ensure the purity of purification. In practical application, the number of the sets of the membrane purification assemblies 2 can be determined according to the purity of input gas and the requirement of output gas, the membrane purification assemblies 2 are connected end to end, helium can be purified layer by layer, and finally the helium output by the pressure swing adsorption purification assembly 4 can reach high-purity helium of more than 99.995% through single-stage PSA treatment. The end-to-end connection means that the output end of the first-stage membrane purification assembly 2 is connected with the input end of the second-stage purification assembly and then connected to the next more stages, and the split connection means that the output end of the booster compressor 203 of the first-stage membrane purification assembly 2 is connected with the input end of the drying filter group 201 of the second-stage membrane purification assembly 2, and the multistage membrane purification operations are completed by the connection.
In the present embodiment, the membrane module 202 includes a single hollow fiber membrane or a plurality of hollow fiber membranes connected in parallel. The effect of purifying helium is ensured.
In this embodiment, the recovery of the gas on the non-permeate side is ensured. An outlet recovery end for non-permeate gas is also provided on one side of the membrane module 202. The recovery rate of the valuable gas of the whole system is improved.
In this embodiment, pressure swing adsorption purification module 4 is provided with an outlet end for the stripping gas. The input end of the booster compressor 203 which is used for connecting the first-stage membrane purification assembly 2 is circularly processed, thereby greatly improving the recovery rate of helium. The desorbed gas can be selectively recycled according to the helium content in the gas and the components of the raw material gas, or used for regeneration in the pressure swing adsorption process, or directly discarded; the different choices can be made according to different gases, in short, the utilization rate of helium is ensured. The first membrane purification module 2 refers to the membrane purification module 2 whose input is connected to gas port 1. In addition, if the use or connection is convenient, the outlet end of the desorbed gas arranged on the pressure swing adsorption purification assembly 4 can also be connected with the input end of the booster compressor 203 in front of the last group of membrane purification assemblies 2, and it can be determined which stage the desorbed gas enters into the membrane purification assemblies according to whether the corresponding helium concentrations are equivalent, so that the efficiency of the helium purification process can be ensured.
In this embodiment, in order to ensure the continuous operation of the adsorption and desorption processes of the adsorption tower of the pressure swing adsorption purification apparatus, the pressure swing adsorption apparatus includes at least two or more adsorption towers inside the components to ensure the alternate use of the adsorption and desorption processes.
In this embodiment, the gas input is controlled for convenience. The gas port 1 for the input of gas is provided with a switching valve 3.
In the present embodiment, the gas input from the gas port 1 is a gas that has been processed. The gas treatment mainly comprises the removal of harmful impurities and a large amount of moisture, such as harmful gases like sulfur dioxide, and the purification work of helium is influenced by the existence of a large amount of water.
In this embodiment, in order to meet the requirement of the user on the helium pressure, the output end of the pressure swing adsorption device assembly may be connected with a helium compressor 5 to obtain different pressure levels. If the pressure of the high-purity helium gas purified by the pressure swing adsorption purification assembly 4 is enough, the helium compressor 5 can be omitted, and the setting of the helium compressor 5 is mainly determined according to the use requirement.
In the present embodiment, the drying portion of the drying filter bank 201 is dried using chilled water or a freeze dryer.
The use of the whole device is: the gas port 1 is connected with a gas source which is processed by liquefied natural flash evaporation gas through a primary hollow fiber membrane, or the input end of the gas port is communicated with a gas source which is obtained by decarbonizing helium-containing shale gas through a vacuum pressure swing adsorption process and concentrating helium gas through a primary membrane. The pressure of the gas source may be up to 38 barg. The purification efficiency of the treated gas source can be higher. The drying filter group 201 may include two parts of a drying process and a filtering process. The input end of the drying filter group 201 of the first membrane purification assembly 2 is connected with the gas port 1, the input end and the output end of the plurality of membrane purification assemblies 2 are connected end to end, the last membrane purification assembly 2 is connected with the pressure swing adsorption purification assembly 4, and the pressure swing adsorption purification assembly 4 outputs purified helium to complete the purification of the helium.
The non-permeable gas outlet end of the membrane module 202 in the middle part can be recycled according to gas components or used for regeneration in the pressure swing adsorption process, and the regeneration exhaust gas of the pressure swing adsorption tower module is communicated with the booster compressor 203 of the first membrane purification module 2 so as to recover helium in the regeneration exhaust gas and improve the recovery rate of the helium.
The helium concentration output by each subsequent membrane purification assembly 2 is higher than that output by the previous-stage membrane purification assembly 2. When the most original helium content is 0.5% -4%, the helium concentration obtained after the treatment of the three-stage membrane purification assembly 2 can reach high-purity helium with the purity of more than 99.995% through single-stage PSA treatment.
However, if the high purity helium obtained by the single-stage PSA treatment cannot be obtained after the three-stage membrane treatment due to the gas components, the treatment of the first-stage membrane purification component 2 and even the second-stage membrane purification component 2 can be added until the requirements are met.
The purity of the concentrated helium which reaches the concentration requirement after the multi-stage membrane treatment can reach more than 99.995 percent after the helium is purified by the pressure swing adsorption purification assembly 4. In order to improve the comprehensive recovery rate of helium, the regeneration exhaust gas of the pressure swing adsorption tower set is collected and returned to the inlet of the booster compressor 203 of the first membrane purification module 2, and is mixed with the raw material gas at the inlet of the membrane set 202 of the first membrane purification module 2 for recycling treatment.
The regenerated gas discharged after being processed by the psa purification module 4 is not limited to the gas mixture at the permeate gas outlet of the membrane module 202 of the first membrane purification module 2, but may also be mixed with the gas at the permeate gas outlet of the membrane module 202 of the first membrane purification module 2 or even the membrane module 202 of the third membrane purification module 2 according to the ratio of the amount of helium contained in the regenerated gas, and may be specifically determined according to the result of the component analysis.
If the pressure of the high-purity helium gas purified by the pressure swing adsorption purification assembly 4 is not enough, the high-purity helium gas can be collected after being communicated with the helium gas compressor 5. The comprehensive recovery rate of the high-purity helium purified by the multistage membrane group 202 and the pressure swing adsorption tower group is not lower than 95%.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An apparatus for purifying helium by combining multistage membrane treatment and pressure swing adsorption, which is characterized by comprising a gas port (1) for inputting gas and a membrane purification component (2);
the membrane purification assembly (2) comprises a drying filter group (201), a membrane group (202) and a booster compressor (203), the input end of the drying filter group (201) is used as the input end of the membrane purification assembly (2) to be connected with the output end of the gas port (1), the output end of the drying filter group (201) is connected with the input end of the membrane group (202), the output end of the membrane group (202) is connected with the input end of the booster compressor (203), the output end of the booster compressor (203) is used as the output end of the membrane purification assembly (2) to be connected with the input end of the pressure swing adsorption purification assembly (4), and the output end of the pressure swing adsorption purification assembly (4) is connected with a gas collection part;
the output end of the membrane group (202) is a permeate gas outlet end.
2. The apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 1, wherein the membrane purification modules (2) are arranged in at least three groups, and the input ends and the output ends of the membrane purification modules (2) are connected end to end.
3. The apparatus for purifying helium by combining multistage membrane process with pressure swing adsorption as claimed in claim 1, wherein said membrane module (202) comprises a single hollow fiber membrane or a plurality of hollow fiber membranes connected in parallel.
4. The apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 3, wherein said membrane module (202) is further provided with an outlet recovery end of non-permeate gas.
5. The device for purifying helium by combining multistage membrane processing and pressure swing adsorption as claimed in claim 1, wherein the pressure swing adsorption purification module (4) is provided with a desorption gas outlet end, and the outlet end is connected with the input end of the booster compressor (203) of the first-stage membrane purification module (2).
6. The apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 5, wherein the pressure swing adsorption purification module (4) comprises at least two and more than two adsorption towers inside.
7. An apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 1, wherein the gas port (1) for inputting gas is provided with a switching valve (3).
8. The apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 1, wherein the gas port (1) inputs a processed gas source, and the processed gas source at least comprises natural gas flash gas or helium-containing shale gas.
9. The device for purifying helium by combining multistage membrane processing and pressure swing adsorption as claimed in claim 1, wherein the output end of the pressure swing adsorption purification assembly (4) is connected with a helium compressor (5).
10. An apparatus for purifying helium by combining multistage membrane process and pressure swing adsorption as claimed in claim 1, wherein the cooling medium of the drying part of the drying filter bank (201) is set as chilled water or a freeze dryer using an environment-friendly refrigerant.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116440662A (en) * | 2023-03-16 | 2023-07-18 | 上海城投老港基地管理有限公司 | Method for separating and purifying ammonia gas in ammonia-containing mixed waste gas by using membrane |
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2022
- 2022-03-07 CN CN202220511686.0U patent/CN216737597U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116440662A (en) * | 2023-03-16 | 2023-07-18 | 上海城投老港基地管理有限公司 | Method for separating and purifying ammonia gas in ammonia-containing mixed waste gas by using membrane |
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