A pretreatment and purification device for helium-containing natural gas

Abstract

The present invention discloses a pretreatment and purification device for helium-containing natural gas, comprising a bracket, a tank body support being provided at the lower end of the bracket, a through hole of the tank body support being sleeved with a vertically arranged gas storage tank, an air inlet pipe being provided at the lower end of the gas storage tank, the air inlet pipe being connected to the air outlet end of a gas compressor, the gas storage tank being divided into an inner tank and an outer tank, the inner tank being provided with an electromagnetic valve, and the inner part of the outer tank being sleeved with an annular sleeve. Compared with the prior art, the pretreatment and purification device for helium-containing natural gas has the following advantages: gas is made to do work through adiabatic throttling, so that internal energy in the gas is converted into mechanical energy, thereby achieving temperature reduction, which can play a role in saving energy consumption; in the device, a multi-cavity setting is adopted, so that the temperature is reduced when methane is condensed, and the reduced temperature can also be used for the subsequent condensation of nitrogen, further playing a role in saving energy and reducing consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of helium extraction, in particular to a pretreatment and purification device for helium-containing natural gas. Background Art

[0002] Helium is a colorless, odorless, inert gas with an inert chemical nature. It is generally chemically inert and rarely reacts with other substances. Its liquefaction temperature at normal pressure is -268.9°C. Due to its unique properties, helium has important applications in medical, cryogenic, and optical fiber applications.

[0003] Currently, natural gas containing helium is the main source of helium production in industry. When natural gas is liquefied, a portion of the natural gas that does not liquefy is called flash gas. This gas is considered waste during liquefaction of natural gas. This gas is collected and used for helium extraction.

[0004] This part of the gas contains impurity gases such as methane and nitrogen. The current impurity removal process for helium extraction has the following problems: there are too many impurities in the helium, which cannot achieve effective impurity removal effects; and when condensing various impurity gases, separate cooling is often used. That is, after removing one gas, it is transferred to another container for further cooling and impurity removal. Although this method of impurity removal is relatively clean and thorough, the equipment occupies a large space and requires high energy consumption. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a pretreatment and purification device for helium-containing natural gas, which can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pretreatment and purification device for helium-containing natural gas, comprising a bracket, a tank body support is provided at the lower end of the bracket, the through hole of the tank body support is socketed with a vertically arranged gas storage tank, the lower end of the gas storage tank is provided with an air intake pipe, the air intake pipe is connected to the air outlet end of the gas compressor, the air intake pipe is connected to the inner tank in the gas storage tank, the gas storage tank is divided into an inner tank and an outer tank, the outer tank is provided with an annular sleeve, the annular sleeve and the inner tank are coaxially arranged, a catalyst is socketed in the strip through hole on the annular sleeve, a connecting flange is provided at one end of the outer side surface of the outer tank, a sealing ring is provided at the middle position of the outer side surface of the inner tank, a conduit connected to the connecting flange and located in the gas storage tank extends to the bottom of the inner tank, the conduit located outside the gas storage tank is connected to the connecting flange and is connected to the pump body on the other side of the bracket, and the upper end of the outer tank is connected to the adsorber through a conduit.

[0007] Furthermore, the cavity in the adsorber is divided into a plurality of chambers by inner wall partitions, and the adsorbent in the chambers is composed of silica gel and activated carbon.

[0008] Furthermore, the tank body holder is composed of a base plate, an arc-shaped sleeve plate and a buckle. The base plate is connected to the arc-shaped sleeve plate through fasteners. The buckle and the arc-shaped sleeve plate are coaxially arranged and located above the arc-shaped sleeve plate.

[0009] Furthermore, a diagonal brace is provided between the longitudinal bracket and the transverse bracket of the bracket, and a tank guard is provided on the upper end of the longitudinal bracket and the transverse bracket between the longitudinal brackets.

[0010] Furthermore, the tank guard seat includes a positioning guard plate, a guard seat connecting shaft and a locking clamp. The positioning guard plate is located on one side of the longitudinal bracket, and the guard seat connecting shaft passes through the positioning guard plate and is connected to the locking clamp. There are two locking clamps, and the two locking clamps are engaged with the gas storage tank. A locking sleeve is sleeved in the locking clamp near the end of the guard seat connecting shaft.

[0011] Furthermore, the adsorber is located on the side adsorber support on the longitudinal bracket, and the side adsorber support is composed of a longitudinal base, an edge frame and a support bracket. The longitudinal base is located at both ends of the edge frame and is fixedly connected to the longitudinal bracket. The support bracket is a group of steel plates with circular arcs, and the inner diameter of the arc is consistent with the outer diameter of the adsorber.

[0012] Furthermore, an ear plate is provided on one side of the support bracket at both ends of the adsorber, and a slot is provided on the ear plate. The ear plate and the clamping seat fix the adsorber, and the locking shaft hinged at the end of the clamping seat corresponds to the slot on the ear plate.

[0013] Furthermore, a compressor base is provided on one side of the bracket, and the compressor base is screwed to the support legs provided around the gas compressor through fasteners, and a circular through hole is provided on the side of the compressor base.

[0014] Furthermore, a pressure gauge is provided on the outer side of the gas storage tank, and the other end of the pressure gauge is connected to the inner tank.

[0015] Furthermore, the outer tank is also connected to the nitrogen storage tank via a connecting conduit, and a solenoid valve is provided on the outer side of the connecting conduit.

[0016] Compared with the existing technology, this helium-containing natural gas pretreatment and purification device has the following advantages:

[0017] 1. Through adiabatic throttling, the gas is made to do work, so that the internal energy in the gas is converted into mechanical energy, thereby achieving a temperature drop, which can save energy consumption;

[0018] 2. In this device, a multi-chamber setting is adopted. When condensing methane, the temperature is reduced. The reduced temperature can also be used for the subsequent condensation of nitrogen, further playing the role of energy saving and consumption reduction;

[0019] 3. The methane and nitrogen produced by this device can be further recovered to improve the utilization efficiency of materials and maximize the recovery and utilization of the effective components of the raw gas. It has low energy consumption, low investment and good product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the present invention Figure 1 ;

[0021] Figure 2 Schematic diagram of the structure of the present invention Figure 2 ;

[0022] Figure 3 This is the main view of the present invention;

[0023] Figure 4 It is a left side view of the present invention;

[0024] Figure 5 for Figure 3 The enlarged structural diagram at B in the middle;

[0025] Figure 6 for Figure 4 Schematic diagram of the AA section structure;

[0026] Figure 7 for Figure 1 Enlarged structural diagram at point C in the middle.

[0027] In the figure: 1 bracket, 11 longitudinal bracket, 12 transverse bracket, 13 diagonal brace, 14 tank guard, 141 arc-shaped holder, 142 side guard, 143 locking clamp, 15 side adsorber support, 151 longitudinal base, 152 edge frame, 153 support bracket, 16 ear plate, 17 holding seat, 18 locking clamp shaft, 19 compressor base, 2 tank body bracket, 21 base plate, 22 arc-shaped sleeve plate, 23 buckle, 3 gas storage tank, 31 inner tank, 32 outer tank, 4 air inlet pipe, 5 gas compressor, 6 annular sleeve, 7 catalyst, 20 support foot, 24 pressure gauge, 25 connecting pipe, 26 nitrogen storage tank, 8 connecting flange, 9 sealing ring, 10 adsorber. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present invention, if the direction description is involved, for example, the direction or position relationship indicated by "up", "down", "front", "back", "left", "right", etc. is based on the attached Figure 3 The orientations or positional relationships shown are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a particular orientation. Therefore, they should not be construed as limiting the present invention. When a feature is referred to as being "disposed," "fixed," or "connected" to another feature, it may be disposed, fixed, or connected to the other feature directly or indirectly.

[0030] See also Figure 1-7 The present invention provides a technical solution: a pretreatment and purification device for helium-containing natural gas, comprising a bracket 1, a tank holder 2 being provided at the lower end of the bracket 1, the through hole of the tank holder 2 being used to place a vertically arranged gas storage tank 3, the diameter of the through hole inside the tank holder 2 being consistent with the outer diameter of the gas storage tank 3, thereby facilitating the assembly of the gas storage tank 3 and ensuring its stability.

[0031] An air inlet pipe 4 is provided at the lower end of the gas storage tank 3, and the air inlet pipe 4 is connected to the air outlet end of the gas compressor 5. The gas compressor 5 is used to compress the flash gas. When the compressed gas reaches the set threshold, the solenoid valve connected to the gas storage tank 3 opens, and the compressed gas is all squeezed into the inner tank 31 in the gas storage tank 3. The air outlet of the gas pipeline connected to the solenoid valve is a small hole. The flash gas is cooled by the throttling effect, so that the temperature of the gas entering the inner tank 31 is reduced. After cooling, the methane in the mixed gas is liquefied. The liquefied methane is discharged through the impurity removal component composed of the connecting flange 8, the conduit and the pump body for secondary recycling.

[0032] The gas storage tank 3 is divided into an inner tank 31 and an outer tank 32 . A refrigerant is introduced into the cavity between the outer tank 32 and the inner tank 31 to cool the mixture in the inner tank 31 and liquefy the mixture in the inner tank 31 .

[0033] An annular sleeve 6 is provided inside the outer tank 32, and the annular sleeve 6 and the inner tank 31 are arranged coaxially. A connecting flange 8 is provided at one end of the outer side surface of the outer tank 32, and a sealing ring 9 is provided in the middle position of the outer side surface of the inner tank 31. The catalyst 7 is sleeved in the strip-shaped through hole on the sealing ring 9.

[0034] The sealing ring 9 seals the cavity between the outer tank 32 and the inner tank 31, and divides the space therein into two parts. The lower end is a refrigerant storage chamber, and the space cavity therein is used to place external refrigerant to play a cooling role. The cavity at the upper end is used to remove hydrogen from the mixed gas. A catalyst 7 is provided between the annular sleeve 6 at the upper end and the sealing ring 9. Under the action of the catalyst 7, hydrogen and oxygen react to remove the hydrogen gas therein, thereby achieving the purpose of further removing impurities.

[0035] The conduit connected to the connecting flange 8 and located inside the gas storage tank 3 extends to the bottom of the inner tank 31. The conduit located outside the gas storage tank 3 is connected to the connecting flange 8 and is connected to the pump body. The pump body is used to extract the condensed impurity gas. The upper end of the outer tank 32 is connected to the adsorber 10 through the conduit. The upper end of the outer tank 32 is also provided with a valve for introducing oxygen. The adsorber 10 is used to absorb water in the gas.

[0036] The cavity in the adsorber 10 is divided into several chambers by inner wall partitions. The adsorbent in the chamber is composed of silica gel and activated carbon. By using multiple chambers, the gas is dispersed inside each chamber, which plays a role of rapid adsorption.

[0037] The tank body holder 2 is composed of a base plate 21, an arc-shaped sleeve plate 22 and a buckle 23. The base plate 21 is connected to the arc-shaped sleeve plate 22 by fasteners. The buckle 23 and the arc-shaped sleeve plate 22 are coaxially arranged and located above the arc-shaped sleeve plate 22. The tank body holder 2 facilitates the clamping of the gas storage tank 3 and facilitates the installation and placement of the gas storage tank 3.

[0038] A diagonal brace 13 is provided between the longitudinal bracket 11 and the transverse bracket 12 of the bracket 1, and a tank guard 14 is provided on the upper end of the longitudinal bracket 11 and the transverse brace between the longitudinal brackets 11, which plays a protective role for the tank.

[0039] The tank guard seat 14 consists of a positioning guard plate 141, a guard seat connecting shaft 142 and a locking clamp 143. The positioning guard plate 141 is located on one side of the longitudinal bracket 11. The guard seat connecting shaft 142 passes through the positioning guard plate 141 and is connected to the locking clamp 143. There are two locking clamps 143. The two locking clamps 143 are engaged with the gas storage tank 3. A locking sleeve 144 is sleeved in the locking clamp 143 near the end of the guard seat connecting shaft 142.

[0040] The adsorber 10 is located on the side adsorber support 15 on the longitudinal bracket 11. The side adsorber support 15 is composed of a longitudinal base 151, an edge frame 152 and a support bracket 153. The longitudinal base 151 is located at both ends of the edge frame 152 and is fixedly connected to the longitudinal bracket 11. The support bracket 153 is a group of steel plates with arcs, and the inner diameter of the arc is consistent with the outer diameter of the adsorber. The adsorber 10 adopts a replaceable design, and the adsorber 10 can be replaced in time to improve the impurity removal ability and facilitate further impurity removal of helium in the later stage.

[0041] An ear plate 16 is provided on one side of the arc steel plate at both ends of the adsorber 10, and a slot is provided on the ear plate 16. The ear plate 16 and the clamping seat 17 fix the adsorber 10. The locking card shaft 18 hinged at the end of the clamping seat 17 is corresponding to the slot provided on the ear plate 16. The clamping seat 17 and the ear plate 16 form a clamping ring, which is convenient for clamping the adsorber 10, facilitating the replacement of the adsorber 10, and improving the later inspection and maintenance.

[0042] A compressor base 19 is provided on one side of the bracket 1 . The compressor base 19 is screwed to the support legs 20 provided around the gas compressor 5 through fasteners. A circular through hole is provided on the side of the compressor base 19 .

[0043] A pressure gauge 24 is provided on the outer side of the gas storage tank 3, and the other end of the pressure gauge 24 is connected to the inner tank 31. The pressure gauge 24 detects the internal pressure change, which makes it easier to understand the situation inside the tank and improves the convenience of use.

[0044] The outer tank 32 is further connected to the nitrogen storage tank 26 via a connecting conduit 25 , and a solenoid valve is provided on the outer side of the connecting conduit 25 .

[0045] During use: the flash gas generated when the natural gas is liquefied is compressed under the action of the gas compressor 5. When the compressed gas reaches the set threshold, the solenoid valve in the gas storage tank 3 is opened, and the compressed gas is all squeezed into the tank body on the gas storage tank 3. The flash gas is throttled to reduce the gas temperature, and the gas temperature in the inner tank 31 drops. The methane in the mixed gas after cooling begins to liquefy. The liquefied methane is extracted through the conduit connected by the connecting flange 8 under the action of the pump body. After the liquefied methane is removed, the solenoid valve on the outer side of the connecting conduit 25 is opened, and the refrigerant is introduced to fill the space between the outer tank 32 and the inner tank 31. The temperature in the cavity is continuously lowered to liquefy the nitrogen in the inner tank 31. The liquefied nitrogen is connected to the conduit through the connecting flange 8. Under the action of the pump body, it is extracted for denitrification treatment. After the treatment of nitrogen and methane, the main gases in it are helium and hydrogen. At this time, hydrogen removal treatment is carried out, and the electromagnetic valve on the inner tank 31 is opened to allow the gas to overflow into the outer tank 32 and the cavity of the inner tank 31 where the catalyst 7 is located. At this time, oxygen is introduced, and hydrogen and oxygen are converted into water vapor under the action of the catalyst 7. At this time, the mixed gas is extracted under the action of the external air pump, and the gas enters the adsorber 10 for adsorption, thereby adsorbing the water vapor generated by the catalysis to obtain crude helium.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pretreatment and purification device for helium-containing natural gas, comprising a bracket (1), a tank support (2) provided at the lower end of the bracket (1), a through hole of the tank support (2) being sleeved with a vertically arranged gas storage tank (3), an air intake pipe (4) provided at the lower end of the gas storage tank (3), the air intake pipe (4) being connected to the air outlet end of a gas compressor (5), and the air intake pipe (4) being connected to an inner tank (31) in the gas storage tank (3), characterized in that: The gas storage tank (3) is divided into an inner tank (31) and an outer tank (32). An annular sleeve (6) is provided inside the outer tank (32). The annular sleeve (6) and the inner tank (31) are coaxially arranged. A catalyst (7) is sleeved in the strip-shaped through hole on the annular sleeve (6). A connecting flange (8) is provided at one end of the outer side surface of the outer tank (32). A sealing ring (9) is provided at the middle position of the outer side surface of the inner tank (31). A conduit connected to the connecting flange (8) and located inside the gas storage tank (3) extends to the bottom of the inner tank (31). A conduit located outside the gas storage tank (3) is connected to the connecting flange (8) and is connected to the pump body on the other side of the bracket (1). The upper end of the outer tank (32) is connected to an adsorber (10) through a conduit.

2. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: The cavity in the adsorber (10) is divided into a plurality of chambers by an inner wall partition, and the adsorbent in the chamber is composed of silica gel and activated carbon.

3. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: The tank body holder (2) is composed of a base plate (21), an arc-shaped sleeve plate (22) and a buckle (23). The base plate (21) is connected to the arc-shaped sleeve plate (22) via a fastener. The buckle (23) and the arc-shaped sleeve plate (22) are coaxially arranged and located above the arc-shaped sleeve plate (22).

4. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: A diagonal brace (13) is provided between the longitudinal bracket (11) and the transverse bracket (12) of the bracket (1), and a tank guard (14) is provided on the upper end of the longitudinal bracket (11) and the transverse brace between the longitudinal brackets (11).

5. The helium-containing natural gas pretreatment and purification device according to claim 4, characterized in that: The tank guard seat (14) includes a positioning guard plate (141), a guard seat connecting shaft (142) and a locking clamp (143). The positioning guard plate (141) is located on one side of the longitudinal bracket (11). The guard seat connecting shaft (142) passes through the positioning guard plate (141) and is connected to the locking clamp (143). There are two locking clamps (143). The two locking clamps (143) are engaged with the gas storage tank (3). A locking sleeve (144) is sleeved in the locking clamp (143) near the end of the guard seat connecting shaft (142).

6. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: The adsorber (10) is located on the upper side adsorber support (15) of the longitudinal bracket (11), and the side adsorber support (15) is composed of a longitudinal base (151), an edge frame (152) and a support bracket (153). The longitudinal base (151) is located at both ends of the edge frame (152) and is fixedly connected to the longitudinal bracket (11). The support bracket (153) is a set of steel plates with arcs, and the inner diameter of the arc is consistent with the outer diameter of the adsorber (10).

7. The helium-containing natural gas pretreatment and purification device according to claim 6, characterized in that: An ear plate (16) is provided on one side of the support bracket (153) at both ends of the adsorber (10), and a slot is provided on the ear plate (16). The ear plate (16) and the clamping seat (17) fix the adsorber (10), and a locking shaft (18) hinged at the end of the clamping seat (17) corresponds to the slot on the ear plate (16).

8. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: A compressor base (19) is provided on one side of the bracket (1), and the compressor base (19) is screwed to support legs (20) provided around the gas compressor (5) through fasteners, and a circular through hole is provided on the side of the compressor base (19).

9. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: A pressure gauge (24) is provided on the outer side of the gas storage tank (3), and the other end of the pressure gauge (24) is connected to the inner tank (31).

10. The helium-containing natural gas pretreatment and purification device according to claim 1, characterized in that: The outer tank (32) is also connected to the nitrogen storage tank (26) via a connecting conduit (25), and a solenoid valve is provided on the outer side of the connecting conduit (25).

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