CN212299662U - Natural gas low-temperature throttling helium extraction device - Google Patents
Natural gas low-temperature throttling helium extraction device Download PDFInfo
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- CN212299662U CN212299662U CN202021754267.7U CN202021754267U CN212299662U CN 212299662 U CN212299662 U CN 212299662U CN 202021754267 U CN202021754267 U CN 202021754267U CN 212299662 U CN212299662 U CN 212299662U
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Abstract
The utility model discloses a natural gas low temperature throttle draws helium device, including cold box and flash tank, the cold box is connected with natural gas admission line, the cold box is connected with the flash tank, the top gaseous phase export of flash tank is connected with the cold box, the bottom liquid phase export of flash tank is connected with the one-level booster pump, divide into two the tunnel after the one-level booster pump pressure boost, wherein all the way through the pipeline after the second grade booster pump pressure boost be connected with the cold box, another way is connected with the cold box through the pipeline to after the cold box is reheated, be connected through the expansion end of pipeline with the expander, be connected through pipeline and cold box after the expansion, and after the cold box is reheated, be connected through the pipeline with the pressure boost end of expander, be connected through pipeline and cooling unit after the pressure boost. The utility model discloses a helium is concentrated and is retrieved in natural gas low temperature throttle realization natural gas, adopts liquid hydrocarbon throttle and natural gas expansion to provide cold volume for the device, does not need outside refrigeration to provide cold volume, realizes cold volume optimization matching, has reduced the device energy consumption.
Description
Technical Field
The utility model belongs to the technical field of the natural gas is handled, in particular to natural gas low temperature throttle draws helium device is applicable to and draws helium from the natural gas that contains helium.
Background
Helium is an extremely light, colorless, odorless, tasteless, monatomic gas at ambient temperature, and is the most difficult of all gases to liquefy, and its liquefying temperature reaches-268.9 ℃ at ambient temperature. Helium has wide application in the fields of medical treatment, optical fibers and superconduction. The current industry has helium-containing natural gas as the only source for helium production. The content of helium in the natural gas is only 0.05 percent at least and can reach 8 percent at most. The technology of extracting helium from natural gas by cryogenic rectification is still the main mode for extracting helium from natural gas by utilizing the difference of boiling points of helium and natural gas, and the technology is to adopt one or two rectifying towers to enrich and concentrate helium in natural gas at low temperature. The helium can be effectively concentrated by adopting the rectification tower to separate and extract the helium at low temperature, the process flow is relatively complex, and the investment is high.
SUMMERY OF THE UTILITY MODEL
The invention of the utility model aims to: aiming at the existing problems, the device for extracting the helium gas by throttling the natural gas at the low temperature can realize the optimal matching of the cold quantity and reduce the energy consumption.
The utility model adopts the technical proposal that: the utility model provides a natural gas low temperature throttle draws helium device which characterized in that: including cold box and flash tank, the cold box is connected with natural gas admission line, the cold box is connected with the flash tank through the pipeline that is provided with first choke valve, the top gaseous phase export of flash tank passes through the pipeline and is connected with the cold box, the bottom liquid phase export of flash tank passes through the pipeline and is connected with one-level booster pump, divide into two the tunnel after the one-level booster pump pressure boost, wherein be connected with the cold box through the pipeline after the second grade booster pump pressure boost all the way to send back process through the pipeline after the cold box is reheated, another sweetgum fruit is passed through the pipeline and is connected with the cold box, and after the cold box is reheated, the expansion end through pipeline and expander is connected, and after the cold box is reheated, through pipeline and expander's pressurization end connection, be connected with cooling unit through the pipeline after the pressure boost, send back process through the pipeline after the cooling.
Natural gas low temperature throttle draws helium device, its the top gaseous phase of flash tank is connected with the knockout drum through the pipeline after the cold box internal condensation, the gaseous phase export at knockout drum top is passed through the pipeline and is connected with the cold box, delivers to back process through the pipeline after the cold box is reheated, the liquid phase export of knockout drum bottom is connected with the cold box through the pipeline that is provided with the second choke valve, delivers to back process through the pipeline after the cold box is reheated.
Natural gas low temperature throttle draws helium device, its the liquid phase of separator tank bottom is connected with the fuel gas compressor through the pipeline after the cold box is rewarming, the fuel gas compressor passes through the pipeline and is connected with the third cooler, delivers to the back process through the pipeline after the cooling.
Natural gas low temperature throttle extract helium device, its the cooling unit includes first cooler, natural gas compressor and second cooler, the pressure boost end of expander is passed through the pipeline and is connected with first cooler, first cooler passes through the pipeline and is connected with natural gas compressor, natural gas compressor passes through the pipeline and is connected with the second cooler, the second cooler passes through the pipeline and delivers to back process.
Natural gas low temperature throttle draw helium device, its precooling section exit end in the cold box passes through the pipeline and takes off the heavy hydrocarbon tower to be connected, take off the secondary precooling section entrance connection of top gaseous phase export in heavy hydrocarbon tower through pipeline and cold box, the secondary precooling section exit end in the cold box passes through the pipeline and takes off the heavy hydrocarbon tower reflux tank to be connected, the gaseous phase that takes off the heavy hydrocarbon tower reflux tank passes through the pipeline and is connected with the condensing section in the cold box.
Natural gas low temperature throttle draw helium device, its take off the bottom liquid phase export of heavy hydrocarbon tower reflux tank and take off heavy hydrocarbon tower upper portion through being provided with the pipeline that takes off heavy hydrocarbon tower backwash pump and be connected, take off heavy hydrocarbon tower bottom liquid hydrocarbon and pass through pipeline to back process.
Compared with the prior art, the utility model has the positive effects that: helium in the natural gas is concentrated and recovered through natural gas low-temperature throttling, liquid hydrocarbon throttling and natural gas expansion are adopted to provide cold energy for the device, external refrigeration is not needed to provide the cold energy, cold energy is optimized and matched, and device energy consumption is reduced.
Drawings
The invention will be described by way of example only and with reference to the accompanying drawings, in which
Fig. 1 is a schematic diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of embodiment 2 of the present invention.
The labels in the figure are: 1 is the natural gas admission line, 2 is the cold box, 4 is taking off the heavy hydrocarbon tower, 7 is taking off the heavy hydrocarbon tower reflux drum, 9 is taking off the heavy hydrocarbon tower reflux pump, 14 is first choke valve, 16 is the flash tank, 19 is the knockout drum, 23 is the second choke valve, 27 is the one-level booster pump, 29 is the second grade booster pump, 34 is the expander, 38 is first cooler, 40 is the natural gas compressor, 42 is the second cooler, 44 is the fuel compressor, 46 is the third cooler.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the position or the positional relationship is based on the position or the positional relationship shown in the drawings, or the position or the positional relationship that the utility model is usually placed when using, or the position or the positional relationship that the skilled person conventionally understands, or the position or the positional relationship that the utility model is usually placed when using, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or suggest that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases for a person of ordinary skill in the art; the drawings in the embodiments are provided to clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Example 1:
as shown in fig. 1, the device for extracting helium from natural gas by low-temperature throttling comprises a cold box 2 and a flash tank 16, the cold box 2 is connected with a natural gas inlet pipeline 1, the cold box 2 is connected with a flash tank 16 through a pipeline provided with a first throttle valve 14, the top gas phase outlet of the flash tank 16 is connected with the cold box 2 through a pipeline, after the top gas phase of the flash tank 16 is condensed in the cold box 2, is connected with a separation tank 19 through a pipeline, a gas phase outlet at the top of the separation tank 19 is connected with a cold box 2 through a pipeline, and is sent to the post-process through a pipeline after being reheated by the cold box 2, the liquid phase outlet at the bottom of the separation tank 19 is connected with the cold box 2 through a pipeline provided with a second throttle valve 23, is reheated by the cold box 2 and then is connected with a fuel gas compressor 44 through a pipeline, the fuel gas compressor 44 is connected to a third cooler 46 through a pipe, and is cooled and sent to a post-process through a pipe; the bottom liquid phase outlet of flash tank 16 passes through the pipeline and is connected with one-level booster pump 27, divide into two the tunnel after the pressurization of one-level booster pump 27, wherein be connected with cold box 2 through the pipeline after the pressurization of second grade booster pump 29 all the way, and send to back process through the pipeline after the cold box 2 is reheated, another sweetgum fruit is connected with cold box 2 through the pipeline, and after the cold box 2 is reheated, be connected through the expansion end of pipeline with expander 34, be connected with cold box 2 through the pipeline after the inflation, and after the cold box 2 is reheated, be connected through the pressure boost end of pipeline with expander 34, be connected with cooling unit through the pipeline after the pressurization, send to back process through the pipeline after the cooling.
The cooling unit includes a first cooler 38, a natural gas compressor 40, and a second cooler 42, the pressurizing end of the expander 34 is connected to the first cooler 38 through a pipeline, the first cooler 38 is connected to the natural gas compressor 40 through a pipeline, the natural gas compressor 40 is connected to the second cooler 42 through a pipeline, and the second cooler 42 is sent to a post-process through a pipeline.
Based on the natural gas low-temperature throttling extraction helium device, the natural gas low-temperature throttling extraction helium method specifically comprises the following steps:
firstly, natural gas with the temperature of 30-50 ℃ from 5000 kPa.a-6000 kPa.a of a natural gas inlet pipeline enters a cold box to be pre-cooled to-145-125 ℃.
The second step, the natural gas after will condensing passes through the pipeline and throttles to 450kPa.a ~ 650kPa.a through first choke valve, can realize the helium and tentatively concentrate to the gaseous phase from flash evaporation in the liquefied natural gas through throttling with helium) and send the flash tank to carry out gas-liquid separation through the pipeline, wherein: the liquid phase enters a first-stage booster pump through a pipeline and is divided into two paths of material flows after being pressurized to 1500 kPa.a-2000 kPa.a, wherein: a 40-60% material flow passes through a pipeline, is pressurized to 5500 kPa.a-6500 kPa.a by a secondary booster pump, enters a cold box through the pipeline to be reheated to 25-45 ℃, and then enters the next procedure for treatment through the pipeline; and the other 40-60% of material flow enters a cold box through a pipeline to be reheated to-70-60 ℃, then enters an expansion machine through a pipeline to be expanded to 600-1200 kPa.a, returns to the cold box through a pipeline to be further reheated to 25-45 ℃, enters the expansion machine through a pipeline to be pressurized, is cooled through a cooling unit and is conveyed to the next procedure for treatment.
And thirdly, the gas phase in the flash tank is conveyed to a cold box through a pipeline to be further condensed to-176 to-170 ℃, then enters a separation tank through a pipeline to be subjected to gas-liquid separation, and more natural gas components in the helium are condensed into a liquid phase through further condensation, so that the helium is further concentrated, wherein: the gas phase enters a cold box through a pipeline and is reheated to 25-45 ℃, and then the gas phase is treated in the next procedure through the pipeline; and the liquid phase enters a second throttling valve through a pipeline to be throttled to 200 kPa.a-300 kPa.a so as to provide cold energy for further condensation of the gas phase from the flash tank, enters a cold box through the pipeline to be reheated to 25-45 ℃, enters a fuel gas compressor through the pipeline to be pressurized to 500 kPa.a-700 kPa.a, enters a third cooler through the pipeline to be cooled to 40-50 ℃, and is sent to the next procedure for treatment.
Specifically, in the second step, the material pressurized by the expander is conveyed to the first cooler through a pipeline to be cooled to 40-50 ℃, then enters the natural gas compressor through the pipeline to be pressurized to 5600 kPa.a-6600 kPa.a, is cooled to 40-50 ℃ through the second cooler through the pipeline, and is conveyed to the next process for treatment through the pipeline.
Example 2:
as shown in fig. 2, embodiment 2 is substantially the same as embodiment 1, and its main difference is: the outlet end of a precooling section in the cold box 2 is connected with a heavy hydrocarbon removal tower 4 through a pipeline, the top gas phase outlet of the heavy hydrocarbon removal tower 4 is connected with the inlet end of a secondary precooling section in the cold box 2 through a pipeline, the outlet end of the secondary precooling section in the cold box 2 is connected with a heavy hydrocarbon removal tower reflux tank 7 through a pipeline, and the gas phase of the heavy hydrocarbon removal tower reflux tank 7 is connected with a condensing section in the cold box 2 through a pipeline; take off the bottom liquid phase export of heavy hydrocarbon tower reflux tank 7 and take off 4 upper portions of heavy hydrocarbon tower and be connected through being provided with the pipeline that takes off heavy hydrocarbon tower reflux pump 9, take off 4 bottom liquid hydrocarbons in heavy hydrocarbon tower and pass through pipeline to back process.
Based on the difference of the structural design, the method for extracting helium from natural gas by low-temperature throttling mainly has the following differences: after natural gas from a natural gas inlet pipeline enters a cold box and is pre-cooled to-65 to-55 ℃, the natural gas enters the lower part of a heavy hydrocarbon removal tower through a pipeline for separation, and liquid hydrocarbon at the bottom of the heavy hydrocarbon removal tower enters the next procedure for treatment through a pipeline; and the gas phase at the top of the heavy hydrocarbon removal tower enters a cold box through a pipeline and is further precooled to-75-65 ℃, and then enters a heavy hydrocarbon removal tower reflux tank through a pipeline to be subjected to gas-liquid separation, wherein: the liquid phase enters a heavy hydrocarbon removal tower reflux pump through a pipeline, the pressure of the liquid phase is 5200 kPa.a-6200 kPa.a, the liquid phase enters the top of the heavy hydrocarbon removal tower through the pipeline, the gas phase enters a cold box through the pipeline and is further condensed to-145 to-125 ℃, and the post procedures are the same as the second step and the third step of the embodiment 1. Heavy hydrocarbon tower is taken off through the setting, with heavy hydrocarbon desorption in the natural gas, avoids the natural gas to freeze stifled equipment or pipeline in condensation process.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (6)
1. The utility model provides a natural gas low temperature throttle draws helium device which characterized in that: including cold box (2) and flash tank (16), cold box (2) are connected with natural gas inlet line (1), cold box (2) are connected with flash tank (16) through the pipeline that is provided with first choke valve (14), the top gaseous phase export of flash tank (16) passes through the pipeline and is connected with cold box (2), the bottom liquid phase export of flash tank (16) passes through the pipeline and is connected with one-level booster pump (27), divide into two the tunnel after one-level booster pump (27) pressure boost, wherein be connected with cold box (2) through the pipeline after one way is connected through second grade booster pump (29) pressure boost to send to back process through the pipeline after cold box (2) is reheated, another way passes through the pipeline and is connected with cold box (2), and after cold box (2) is reheated, be connected through the pipeline and the expansion end of expander (34), be connected with cold box (2) through the pipeline after the expansion, and after being reheated by the cold box (2), the hot-rolled steel plate is connected with the pressurizing end of the expansion machine (34) through a pipeline, is connected with the cooling unit through a pipeline after being pressurized, and is sent to the post-process through a pipeline after being cooled.
2. The device for extracting helium from natural gas through low-temperature throttling as claimed in claim 1, is characterized in that: the top gaseous phase of flash tank (16) is connected through pipeline and knockout drum (19) after cold box (2) internal condensation, the gaseous phase export at knockout drum (19) top is connected with cold box (2) through the pipeline, and send back process through the pipeline after cold box (2) reheat, the liquid phase export of knockout drum (19) bottom is connected with cold box (2) through the pipeline that is provided with second choke valve (23), sends back process through the pipeline after cold box (2) reheat.
3. The device for extracting helium from natural gas through low-temperature throttling as claimed in claim 2, is characterized in that: the liquid phase at the bottom of the separation tank (19) is reheated by the cold box (2) and then is connected with the fuel gas compressor (44) through a pipeline, the fuel gas compressor (44) is connected with the third cooler (46) through a pipeline, and the cooled liquid phase is sent to a post-process through a pipeline.
4. The device for extracting helium from natural gas through low-temperature throttling as claimed in claim 1, is characterized in that: the cooling unit comprises a first cooler (38), a natural gas compressor (40) and a second cooler (42), wherein the pressurizing end of the expansion machine (34) is connected with the first cooler (38) through a pipeline, the first cooler (38) is connected with the natural gas compressor (40) through a pipeline, the natural gas compressor (40) is connected with the second cooler (42) through a pipeline, and the second cooler (42) is sent to a post-process step through a pipeline.
5. The device for extracting helium from natural gas through low-temperature throttling according to any one of claims 1 to 4, is characterized in that: precooling section exit end in cold box (2) passes through the pipeline and is connected with taking off heavy hydrocarbon tower (4), take off the secondary precooling section entrance connection in top gaseous phase export of heavy hydrocarbon tower (4) passes through pipeline and cold box (2), secondary precooling section exit end in cold box (2) passes through the pipeline and takes off heavy hydrocarbon tower reflux drum (7) and is connected, the gaseous phase that takes off heavy hydrocarbon tower reflux drum (7) passes through the pipeline and is connected with the condensation segment in cold box (2).
6. The device for extracting helium from natural gas through low-temperature throttling according to claim 5, is characterized in that: the bottom liquid phase outlet of the heavy hydrocarbon tower reflux tank (7) is connected with the upper part of the heavy hydrocarbon tower (4) through a pipeline provided with a heavy hydrocarbon tower reflux pump (9), and the bottom liquid hydrocarbon of the heavy hydrocarbon tower (4) passes through a pipeline to a post-process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021754267.7U CN212299662U (en) | 2020-08-20 | 2020-08-20 | Natural gas low-temperature throttling helium extraction device |
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| CN202021754267.7U CN212299662U (en) | 2020-08-20 | 2020-08-20 | Natural gas low-temperature throttling helium extraction device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981768A (en) * | 2020-08-20 | 2020-11-24 | 中国石油工程建设有限公司 | Device and method for extracting helium from natural gas through low-temperature throttling |
| CN113670002A (en) * | 2021-09-27 | 2021-11-19 | 西南石油大学 | Double-tower natural gas helium recovery method |
-
2020
- 2020-08-20 CN CN202021754267.7U patent/CN212299662U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981768A (en) * | 2020-08-20 | 2020-11-24 | 中国石油工程建设有限公司 | Device and method for extracting helium from natural gas through low-temperature throttling |
| CN113670002A (en) * | 2021-09-27 | 2021-11-19 | 西南石油大学 | Double-tower natural gas helium recovery method |
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Effective date of registration: 20210302 Address after: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |