Natural gas multi-stage helium extraction skid-mounted equipment

Abstract

The utility model provides natural gas multistage helium extraction skid-mounted equipment which comprises a main tower pry, a pre-absorption pry and a dehydrogenation reaction pry, the main tower pry comprises a main tower pry equipment mounting bottom plate, and multistage helium extraction towers are mounted on the main tower pry equipment mounting bottom plate; the multistage helium extraction tower is sequentially provided with a pre-absorption section, a first dehydrogenation reaction section and a second dehydrogenation reaction section from bottom to top, a pre-absorption pry comprises a pre-absorption pry equipment mounting bottom plate, pre-absorption equipment capable of removing impurities is mounted on the pre-absorption pry equipment mounting bottom plate, and a dehydrogenation reaction pry comprises a dehydrogenation reaction pry equipment mounting bottom plate. Temperature-controllable dehydrogenation reaction equipment is mounted on the dehydrogenation reaction pry equipment mounting bottom plate, pre-absorption equipment capable of removing impurities is communicated with the pre-absorption section, and the temperature-controllable dehydrogenation reaction equipment is communicated with the pre-absorption section, the first dehydrogenation reaction section and the second dehydrogenation reaction section. According to the utility model, the problems of potential safety hazards, incompact equipment arrangement, tedious construction and installation and the like existing in the technological process design in the background technology are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas helium extraction, in particular to a natural gas multi-stage helium extraction skid-mounted equipment. Background Art

[0002] Helium is a colorless, odorless, monatomic noble gas with an extremely low boiling point, strong diffusivity, poor solubility in water, and good thermal conductivity. Due to its unique physical and chemical properties and broad application prospects, it has long been a hot topic in engineering research.

[0003] Currently, the mainstream method for helium production is natural gas extraction. Natural gas helium extraction can be divided into two stages: helium concentration and crude helium refining. Helium concentration technologies include cryogenics, membrane separation, and absorption. While the cryogenics method is relatively mature, it suffers from high energy consumption, high equipment investment, and limited operational flexibility. While membrane separation offers low energy consumption, high separation efficiency, and operational flexibility, it also suffers from complex membrane preparation, high membrane fouling, and difficulty in scale-up. The absorption method uses an organic aqueous solution as an absorbent, selectively absorbing the different hydrate formation faculties of different natural gas species to achieve component separation. This method offers advantages such as mild process conditions, a short flow, and ease of scale-up, and is gaining widespread attention both domestically and internationally. Crude helium refining technologies include pressure swing adsorption (PSA) and catalytic dehydrogenation. While PSA is relatively mature, it cannot effectively separate hydrogen and helium due to the similar molecular size of hydrogen and helium. Therefore, crude helium refining requires first using catalytic dehydrogenation, which involves injecting oxygen into the crude helium and utilizing the reducing properties of hydrogen to generate water vapor through an oxidation reaction. Impurities such as water vapor, nitrogen, and a small amount of oxygen are then removed using pressure swing adsorption.

[0004] A search revealed Chinese patent application number CN112573494A, which discloses a helium refining device using the hydrate method. The device generally comprises a crude helium heat exchanger, a dehydrogenation reactor, a crude helium cooler, a first hydrate formation tower, a second hydrate formation tower, a hydrate decomposer, a helium compressor, and a helium cooler. This device offers advantages such as reduced equipment investment and lower energy consumption.

[0005] However, the prior art scheme has some problems in process flow and equipment arrangement. In the process flow, since the raw gas contains a large amount of methane, if it is directly introduced into the catalytic oxidation dehydrogenation reactor without the helium concentration stage, the reactor may be overheated due to the combustion reaction of methane, and the dehydrogenation reactor does not have temperature control means. Therefore, the process flow design of the device has certain safety hazards. In the equipment arrangement, the dehydrogenation reactor, the first hydrate generation tower, the second hydrate generation tower and the related auxiliary equipment are dispersedly arranged, which increases the land occupation of the device, and the construction and installation are complicated, which limits the application of the device in oil and gas fields. Practical new type content

[0006] To solve the above problems, the utility model aims at providing a natural gas multi-stage helium extraction skid-mounted device, which combines the absorption method with catalytic dehydrogenation and integrates and arranges the equipment into three skids, so as to solve the problems of safety hazards in the process flow design, non-compact equipment arrangement and complicated construction and installation in the background technology.

[0007] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0008] A natural gas multi-stage helium extraction skid-mounted device, comprising a main tower skid, a pre-absorption skid and a dehydrogenation reaction skid, wherein the main tower skid comprises a main tower skid equipment mounting bottom plate, a multi-stage helium extraction tower is mounted on the main tower skid equipment mounting bottom plate, the multi-stage helium extraction tower is sequentially provided with a pre-absorption section, a first dehydrogenation reaction section and a second dehydrogenation reaction section from bottom to top, the pre-absorption skid comprises a pre-absorption skid equipment mounting bottom plate, a pre-absorption equipment capable of removing impurities is mounted on the pre-absorption skid equipment mounting bottom plate, the dehydrogenation reaction skid comprises a dehydrogenation reaction skid equipment mounting bottom plate, a dehydrogenation reaction equipment capable of controlling temperature is mounted on the dehydrogenation reaction skid equipment mounting bottom plate, the pre-absorption equipment capable of removing impurities is connected with the pre-absorption section, and the dehydrogenation reaction equipment capable of controlling temperature is connected with the pre-absorption section, the first dehydrogenation reaction section and the second dehydrogenation reaction section.

[0009] Further, the pre-absorption device capable of removing impurities comprises a raw gas pre-cooler, a fuel gas separator, an absorbent pump and a hydrate heater, the raw gas pre-cooler is provided with a raw gas inlet B3 at the front end of a pipeline for connecting the raw gas, the raw gas pre-cooler is provided with a raw gas pre-cooler outlet B6 at the rear end of the pipeline for connecting the raw gas inlet A1 of the main tower, the liquid phase outlet of the fuel gas separator is connected with the inlet pipe of the absorbent pump, the liquid phase inlet of the fuel gas separator is connected with the outlet pipe of the hydrate heater, the fuel gas separator is provided with a supplementary absorbent inlet B1 and a fuel gas outlet B4, the absorbent pump and the hydrate heater are respectively provided with an absorbent pump outlet B5 and a tower bottom absorbent inlet B2, and the absorbent pump outlet B5 and the tower bottom absorbent inlet B2 are connected with the absorbent inlet A2 and the tower bottom absorbent outlet A7 of the main tower.

[0010] Further, the dehydrogenation reaction device capable of controlling temperature comprises a heat exchanger, a dehydrogenation reaction temperature control valve, a cooler and a pipeline filter, the cold side outlet of the heat exchanger is divided into two paths, one of which is connected with the dehydrogenation reaction temperature control valve, the hot side outlet of the heat exchanger is connected with the inlet pipe of the cooler, and the outlet of the cooler is connected with the pipeline filter; the hot side inlet C2 of the heat exchanger is connected with the one-stage reaction gas outlet A9 of the first dehydrogenation reaction section, the outlet C4 of the pipeline filter and the dehydrogenation reaction temperature control valve is connected with the two-stage reaction gas inlet A6 of the second dehydrogenation reaction section, the cold side outlet C3 of the heat exchanger is connected with the one-stage reaction gas inlet A4 of the first dehydrogenation reaction section, and the pre-absorption section gas inlet C1 of the heat exchanger is connected with the pre-absorption section gas outlet A8.

[0011] Further, the first dehydrogenation reaction section and the second dehydrogenation reaction section are respectively provided with a one-stage oxygen inlet A3 and a two-stage oxygen inlet A5, and the second dehydrogenation reaction section is provided with a crude helium outlet A10 at the end.

[0012] Beneficial effects: the pre-absorption section, the first dehydrogenation reaction section and the second dehydrogenation reaction section are integrated into the multi-stage helium extraction tower, the pre-absorption device capable of removing impurities and the dehydrogenation reaction device capable of controlling temperature are arranged into skids respectively, and three skid blocks are formed. BRIEF DESCRIPTION OF DRAWINGS

[0013] The drawings constituting a part of the present application are used to provide a further understanding of the present application, the schematic embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0014] Figure 1 The principle structure schematic view of the natural gas multi-stage helium extraction skid-mounted device;

[0015] Figure 2 The structure diagram of the multi-stage helium extraction column of the natural gas multi-stage helium extraction skid-mounted equipment is shown in the embodiments of the present application. DETAILED DESCRIPTION

[0016] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0017] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Embodiment 1

[0019] Referring to Figure 1 、 Figure 2 The natural gas multi-stage helium extraction skid-mounted equipment comprises a main column skid 1, a pre-absorption skid 2 and a dehydrogenation reaction skid 3. The main column skid 1 comprises a main column skid equipment mounting bottom plate, and a multi-stage helium extraction column 10 is mounted on the main column skid equipment mounting bottom plate. The multi-stage helium extraction column 10 is sequentially provided with a pre-absorption section 101, a first dehydrogenation reaction section 102 and a second dehydrogenation reaction section 103 from bottom to top. The pre-absorption skid 2 comprises a pre-absorption skid equipment mounting bottom plate, and a pre-absorption equipment capable of removing impurities is mounted on the pre-absorption skid equipment mounting bottom plate. The dehydrogenation reaction skid 3 comprises a dehydrogenation reaction skid equipment mounting bottom plate, and a dehydrogenation reaction equipment capable of controlling temperature is mounted on the dehydrogenation reaction skid equipment mounting bottom plate. The pre-absorption equipment capable of removing impurities is in communication with the pre-absorption section 101, and the dehydrogenation reaction equipment capable of controlling temperature is in communication with the pre-absorption section 101, the first dehydrogenation reaction section 102 and the second dehydrogenation reaction section 103.

[0020] In this embodiment, the pre-absorption section, the first dehydrogenation reaction section and the second dehydrogenation reaction section are all integrated into the multi-stage helium extraction column, and the pre-absorption equipment capable of removing impurities and the dehydrogenation reaction equipment capable of controlling temperature are arranged in skids respectively, thereby forming three skid blocks. The three skid blocks can be quickly installed and disassembled, have a small floor area and are flexible to move, and are beneficial to the practical application in the oil and gas field mining scene.

[0021] In a specific example, the pre-absorption device capable of removing impurities comprises a raw gas pre-cooler 20, a fuel gas separator 21, an absorbent pump 22, and a hydrate heater 23, the raw gas pre-cooler 20 is provided with a raw gas inlet B3 at the front end of the pipeline for connecting the raw gas, the raw gas pre-cooler 20 is provided with a raw gas pre-cooler outlet B6 at the rear end of the pipeline for connecting the raw gas inlet A1 of the main tower lever 1, the liquid phase outlet of the fuel gas separator 21 is connected with the inlet pipe of the absorbent pump 22, the liquid phase inlet of the fuel gas separator 21 is connected with the outlet pipe of the hydrate heater 23, the fuel gas separator 21 is provided with a supplementary absorbent inlet B1 and a fuel gas outlet B4, the absorbent pump 22 and the hydrate heater 23 are respectively provided with an absorbent pump outlet B5 and a tower bottom absorbent inlet B2, the absorbent pump outlet B5 and the tower bottom absorbent inlet B2 are respectively connected with the absorbent inlet A2 and the tower bottom absorbent outlet A7 of the main tower lever 1.

[0022] The present embodiment can remove most of the methane, part of the acid gas and nitrogen in the raw gas through the pre-absorption device capable of removing impurities and the pre-absorption section, and then the raw gas enters the dehydrogenation reaction section, thereby reducing the methane content during the oxidative dehydrogenation and improving the safety of helium production.

[0023] In a specific example, the dehydrogenation reaction device capable of controlling temperature comprises a heat exchanger 30, a dehydrogenation reaction temperature control valve 31, a cooler 32, and a pipeline filter 33, the cold side outlet of the heat exchanger 30 is divided into two paths, one of which is connected with the dehydrogenation reaction temperature control valve 31, the hot side outlet of the heat exchanger 30 is connected with the inlet pipe of the cooler 32, the outlet of the cooler 32 is connected with the pipeline filter 33, the hot side inlet C2 of the heat exchanger 30 is connected with the one-stage reaction gas outlet A9 of the first dehydrogenation reaction section 102, the outlet C4 of the pipeline filter 33 and the dehydrogenation reaction temperature control valve 31 is connected with the two-stage reaction gas inlet A6 of the second dehydrogenation reaction section 103, the cold side outlet C3 of the heat exchanger 30 is connected with the one-stage reaction gas inlet A4 of the first dehydrogenation reaction section 102, and the pre-absorption section gas inlet C1 of the heat exchanger 30 is connected with the pre-absorption section gas outlet A8.

[0024] The present embodiment can timely lead out the heat of the first dehydrogenation reaction section through the heat exchanger and the cold raw material before the reaction, so as to prevent the temperature of the reaction bed layer from being too high, and the dehydrogenation reaction temperature control valve can be used to adjust the opening of the valve according to the temperature of the reaction bed layer, so as to adjust the temperature of the first and second reaction sections at the same time.

[0025] In a specific example, the first dehydrogenation reaction section 102 and the second dehydrogenation reaction section 103 are respectively provided with a first oxygen inlet A3 and a second oxygen inlet A5, and the second dehydrogenation reaction section 103 is provided with a crude helium outlet A10 at the end.

[0026] In summary, the present embodiment has two advantages: first, the operation safety is improved: the pre-absorption of impurities such as methane is realized by the impurity-removable pre-absorption device and the pre-absorption section, thereby reducing the occurrence of side reactions in the dehydrogenation reaction section; the reaction heat is timely led out by setting the first and second dehydrogenation reaction sections, thereby preventing the bed temperature from being too high; the temperature of the first and second dehydrogenation reaction bed sections is simultaneously controlled by the dehydrogenation reaction device with controllable temperature. Second, the equipment arrangement is compact, which is convenient for construction and installation: the pre-absorption section, the first dehydrogenation reaction section, and the second dehydrogenation reaction section are all integrated into the multi-stage helium extraction column, and the pre-absorption device with impurity removal and the dehydrogenation reaction device with controllable temperature are arranged as skids, respectively, to form three skids. The three skids can be quickly installed and disassembled, have a small footprint, and are flexible to move, which is conducive to the practical application in the oil and gas field exploration scene.

[0027] The working principle of the present embodiment is as follows:

[0028] The raw gas enters the pre-absorption skid 2 through the B3 pipe opening, is cooled to 0°C by the raw gas pre-cooler, and then enters the pre-absorption section of the multi-stage helium extraction column to be selectively absorbed by the absorbent pumped from the bottom. Most of the methane, part of the acid gas, and nitrogen in the raw gas form hydrates, which are carried out of the bottom of the multi-stage helium extraction column by the absorbent, heated to 20°C by the hydrate heater, and then separated by the fuel gas separator. The gas phase is discharged from the top of the separator through the B4 pipe opening, and the liquid phase absorbent flows out from the bottom of the separator, is pressurized by the absorbent pump, and then enters the pre-absorption section to realize the circulation of the absorbent. The supplemental absorbent is intermittently supplemented through the supplemental absorbent inlet B1.

[0029] The concentrated helium gas enters the heat exchanger cold side through the pre-absorption section gas outlet A8 and the pre-absorption section gas inlet C1, exchanges heat with the reaction gas outlet of the first dehydrogenation reaction section, and the cold side outlet temperature is about 30°C and the hot side outlet temperature is about 40°C. The cold side outlet gas is divided into two paths, one of which directly enters the first dehydrogenation reaction section through C3 and A4 pipe openings and reacts with the oxygen gas from the first oxygen inlet A3 to realize oxidative dehydrogenation reaction; the other path directly enters the second dehydrogenation reaction section through the dehydrogenation reaction temperature control valve to prevent the reactor from flying due to the high hydrogen content entering the first dehydrogenation reaction section. In actual operation, the opening degree of the dehydrogenation reaction temperature control valve is automatically controlled according to the measured temperature of the first dehydrogenation reaction section bed.

[0030] The reaction gas outlet temperature of the first dehydrogenation reaction section is about 60℃, the reaction gas is cooled to 30℃ by a heat exchanger and a cooler, and then filtered by a pipeline filter to remove the generated water, and then combined with the reaction gas from the dehydrogenation reaction temperature control valve to enter the second dehydrogenation reaction section to perform the oxidative dehydrogenation reaction.

[0031] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A natural gas multistage helium extraction skid mounted apparatus characterized by, The application relates to a helium extraction tower, which comprises a main tower pry (1), a pre-absorption pry (2) and a dehydrogenation reaction pry (3), the main tower pry (1) comprises a main tower pry equipment mounting bottom plate, a multistage helium extraction tower (10) is mounted on the main tower pry equipment mounting bottom plate, the multistage helium extraction tower (10) is sequentially provided with a pre-absorption section (101), a first dehydrogenation reaction section (102) and a second dehydrogenation reaction section (103) from bottom to top, the pre-absorption pry (2) comprises a pre-absorption pry equipment mounting bottom plate, a pre-absorption equipment capable of removing impurities is mounted on the pre-absorption pry equipment mounting bottom plate, the dehydrogenation reaction pry (3) comprises a dehydrogenation reaction pry equipment mounting bottom plate, a dehydrogenation reaction equipment capable of controlling temperature is mounted on the dehydrogenation reaction pry equipment mounting bottom plate, the pre-absorption equipment capable of removing impurities is connected with the pre-absorption section (101), and the dehydrogenation reaction equipment capable of controlling temperature is connected with the pre-absorption section (101), the first dehydrogenation reaction section (102) and the second dehydrogenation reaction section (103).

2. The natural gas multi-stage helium recovery skid of claim 1, wherein, The pre-absorption equipment capable of removing impurities comprises a raw material gas pre-cooler (20), a fuel gas separator (21), an absorbent pump (22) and a hydrate heater (23), a raw material gas inlet (B3) is arranged on a front end pipeline of the raw material gas pre-cooler (20) and used for connecting raw material gas, a raw material gas pre-cooler outlet (B6) is arranged on a rear end pipeline of the raw material gas pre-cooler (20) and used for connecting a raw material gas inlet (A1) of the main tower pry (1), a liquid phase outlet of the fuel gas separator (21) is connected with an inlet pipe of the absorbent pump (22), a liquid phase inlet of the fuel gas separator (21) is connected with an outlet pipe of the hydrate heater (23), the fuel gas separator (21) is provided with a supplementary absorbent inlet (B1) and a fuel gas outlet (B4), the absorbent pump (22) and the hydrate heater (23) are respectively provided with an absorbent pump outlet (B5) and a tower bottom absorbent inlet (B2), and the absorbent pump outlet (B5) and the tower bottom absorbent inlet (B2) are connected with an absorbent inlet (A2) and a tower bottom absorbent outlet (A7) of the main tower pry (1) respectively.

3. The natural gas multi-stage helium recovery skid of claim 1, wherein, The dehydrogenation reaction equipment capable of controlling temperature comprises a heat exchanger (30), a dehydrogenation reaction temperature control valve (31), a cooler (32) and a pipeline filter (33), a cold side outlet of the heat exchanger (30) is divided into two paths, one of which is connected with the dehydrogenation reaction temperature control valve (31), a hot side outlet of the heat exchanger (30) is connected with an inlet pipe of the cooler (32), and an outlet of the cooler (32) is connected with the pipeline filter (33); a hot side inlet (C2) of the heat exchanger (30) is connected with a one-stage reaction gas outlet (A9) of the first dehydrogenation reaction section (102), an outlet (C4) of the pipeline filter (33) and the dehydrogenation reaction temperature control valve (31) is connected with a two-stage reaction gas inlet (A6) of the second dehydrogenation reaction section (103), a cold side outlet (C3) of the heat exchanger (30) is connected with a one-stage reaction gas inlet (A4) of the first dehydrogenation reaction section (102), and a pre-absorption section gas inlet (C1) of the heat exchanger (30) is connected with a pre-absorption section gas outlet (A8).

4. The natural gas multi-stage helium recovery skid of claim 1, wherein, The first dehydrogenation reaction section (102) and the second dehydrogenation reaction section (103) are respectively provided with a first oxygen inlet (A3) and a second oxygen inlet (A5), and the second dehydrogenation reaction section (103) is provided with a crude helium outlet (A10) at the end.

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