Helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system suitable for gas field

Abstract

The invention provides a helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system suitable for a gas field, and particularly relates to the technical field of low-temperature refrigeration. The helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system suitable for the gas field is connected with a first valve through the outlet end of a first buffer tank; a first branch at the outlet end of the first valve is sequentially connected with the second valve, the first electric control valve, the first one-way valve and the third valve and connected with the first inlet end of the cold box, and the two ends of the fourth valve are connected to the inlet end of the second valve and the outlet end of the third valve respectively to form a high-pressure air inlet branch. A second branch at the outlet end of the first valve is sequentially connected with the fifth valve and the second inlet end of the second buffer tank to form a buffer gas inlet branch, the two gas inlet branches can improve the stability of the pressure-stabilizing and flow-stabilizing gas inlet system of the helium liquefaction section, and gas pressure and flow fluctuation can be well controlled.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature refrigeration, and in particular to a helium liquefaction section pressure- and flow-stabilizing air intake system suitable for a gas field. Background Art

[0002] The helium liquefaction unit is the key core equipment for realizing helium liquefaction. The pipeline raw gas entering the front section of helium liquefaction usually passes through membrane separation, crude extraction, refining and other process sections. The pipeline raw gas may also contain neon, and the pressure and flow fluctuations are affected by the wellhead and upstream process sections.

[0003] Liquid helium on the market can be divided into neon-containing liquid helium and neon-free liquid helium. Neon-free liquid helium has higher purity, is more difficult to produce, and has a higher price. If the neon content in the pipeline raw gas before entering the helium liquefaction section exceeds the standard, it may affect the efficiency of helium liquefaction, making the helium liquefaction section unable to operate continuously, thereby affecting liquid helium production and the liquefaction efficiency of the helium liquefaction section.

[0004] In the prior art, a process pipeline is provided before the helium liquefaction device for direct connection, but this method cannot effectively suppress the pressure and flow fluctuations of the pipeline natural gas intake raw gas with a low helium content. Summary of the invention

[0005] In order to solve the problem that the intake system of helium liquefaction cannot control gas pressure and flow fluctuations, the present invention proposes a constant pressure and constant flow intake system for the helium liquefaction section of a gas field.

[0006] The present invention is achieved through the following technical solutions:

[0007] The present invention proposes a helium liquefaction section pressure and flow stabilizing gas inlet system suitable for a gas field, comprising a control unit and a liquefaction unit, wherein:

[0008] The control unit includes a first buffer tank, a first valve, a second valve, a first electric control valve, a first check valve, a third valve, a fourth valve and a fifth valve;

[0009] The liquefaction unit includes a compressor unit, a high-precision oil filter module, a second buffer tank and a cold box, the first outlet end of the cold box is connected to the compressor unit, the high-precision oil filter module and the first inlet end of the cold box in sequence, the first outlet end and the first inlet end of the second buffer tank are connected to the first inlet end and the second inlet end of the cold box, the outlet end of the first buffer tank is connected to the first valve, the first branch of the outlet end of the first valve is connected to the second valve, the first electric control valve, the first one-way valve, the third valve in sequence and connected to the first inlet end of the cold box, and the two ends of the fourth valve are respectively connected to the inlet end of the second valve and the outlet end of the third valve to form a high-pressure air intake branch, the second branch of the outlet end of the first valve is connected to the fifth valve and the second inlet end of the second buffer tank in sequence to form a buffer air intake branch.

[0010] Furthermore, it also includes a second electrically controlled valve and a sixth valve, wherein the second electrically controlled valve is sequentially connected to the sixth valve and the inlet end of the first buffer tank.

[0011] Furthermore, it also includes a refining section, and the refining section is connected to the inlet end of the second electric control valve through a refining section interface.

[0012] Furthermore, it also includes a filtering unit, which includes at least two filtering groups connected in parallel, and the filtering group includes a filter and a seventh valve arranged on both sides of the filter. The filtering unit is arranged between the refining section and the inlet end of the second electric control valve.

[0013] Furthermore, it also includes a return section, which includes a backflow valve of the measurement, control, and distribution module, an eighth valve and a directional neon content analyzer, and the two ends of the backflow valve of the measurement, control, and distribution module are respectively connected to the filtering unit to the inlet end of the second electric control valve and the refining section, and the two sides of the directional neon content analyzer are respectively connected to the two ends of the backflow valve of the measurement, control, and distribution module through the two eighth valves.

[0014] Furthermore, it also includes a first peak helium gas supply valve group and a second peak helium gas supply valve group, the first peak helium gas supply valve group is arranged between the fifth valve and the second buffer tank, the second peak helium gas supply valve group is arranged between the high-precision filter and the first inlet end of the cold box, and the first peak helium gas supply valve group and the second peak helium gas supply valve group are provided with interfaces.

[0015] Furthermore, it also includes a liquid helium distribution box, wherein a first outlet end and a first inlet end of the liquid helium distribution box are respectively connected to a second inlet end and a second outlet end of the cold box.

[0016] Furthermore, it also includes a liquid helium gas distribution interface, which is connected to the second outlet end and the second inlet end of the liquid helium distribution box.

[0017] Beneficial effects of the present invention:

[0018] (1) The helium liquefaction section pressure-stabilizing and flow-stabilizing air intake system suitable for gas fields proposed by the present invention uses a high-pressure air intake branch and a buffer air intake branch as a backup. Both the high-pressure air intake branch and the buffer air intake branch can be used to supply air, which can stabilize the pressure and flow, improve the system reliability, and effectively solve the problem of controlling gas pressure and flow fluctuations.

[0019] (2) The helium liquefaction section pressure-stabilizing and flow-stabilizing intake system suitable for gas fields proposed in the present invention is connected to the buffer intake branch and the high-pressure intake branch through the interfaces on the first peak helium supply valve group and the second peak helium supply valve group to realize the centralized liquefaction of helium and process the incoming helium with peak process load.

[0020] (3) The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields proposed by the present invention is connected to the backflow valve of the measurement, control and distribution module through two eighth valves on both sides of the directional neon content analyzer. When a high neon content is detected, the helium raw gas with unqualified neon content can be returned to the refining section, thereby improving the helium purity and allowing the liquefaction device to operate continuously, and further improving the production efficiency of the helium gas-liquid device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is an overall structural diagram of the helium liquefaction section pressure and flow stabilizing gas intake system applicable to gas fields of the present invention;

[0022] In the figure: refining section interface 1, seventh valve 2, filter 3, eighth valve 4, measurement and control distribution module backflow valve 5, directional neon content analyzer 6, second electric control valve 7, sixth valve 8, first buffer tank 9, first valve 10, second valve 11, first electric control valve 12, first check valve 13, third valve 14, fourth valve 15, fifth valve 16, first peak helium gas supply valve group 17, second peak helium gas supply valve 18, compressor group 19, high-precision oil filter module 20, second buffer tank 21, cold box 22, liquid helium distribution box 23, liquid helium helium distribution interface 24,

[0023] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0024] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0025] Please refer to Figure 1 The present invention proposes a helium liquefaction section pressure and flow stabilizing gas intake system suitable for a gas field, comprising a control unit and a liquefaction unit, wherein:

[0026] The control unit includes a first buffer tank 9, a first valve 10, a second valve 11, a first electric control valve 12, a first check valve 13, a third valve 14, a fourth valve 15 and a fifth valve 16;

[0027] The liquefaction unit includes a compressor unit 19, a high-precision oil filter module 20, a second buffer tank 21 and a cold box 22, the first outlet end of the cold box 22 is connected to the compressor unit 19, the high-precision oil filter module 20 and the first inlet end of the cold box 22 in sequence, the first outlet end and the first inlet end of the second buffer tank 21 are connected to the first inlet end and the second inlet end of the cold box 22, the outlet end of the first buffer tank 9 is connected to the first valve 10, the first branch of the outlet end of the first valve 10 is connected to the second valve 11, the first electric control valve 12, the first one-way valve 13, the third valve 14 in sequence and connected to the first inlet end of the cold box 22, and the two ends of the fourth valve 15 are respectively connected to the inlet end of the second valve 11 and the outlet end of the third valve 14 to form a high-pressure intake branch, the second branch of the outlet end of the first valve 10 is connected to the fifth valve 16 and the second inlet end of the second buffer tank 21 in sequence to form a buffer intake branch.

[0028] In a specific embodiment, the compressor unit 19 is used to compress the helium, the high-precision oil filter module 20 is used to filter particulate impurities in the helium, the compressor unit 19 and the cold box 22 form a circulation loop to liquefy the helium, the first buffer tank 9 and the second buffer tank 21 buffer the high-pressure helium, and the helium enters the circulation loop through the second buffer tank 21 to be liquefied;

[0029] The first branch at the outlet end of the first valve 10 is connected to the second valve 11, the first electric control valve 12, the first non-return valve 13, the third valve 14 in sequence and is connected to the first inlet end of the cold box 22. At the same time, the fourth valve 15 is connected in parallel with the high-pressure air intake branch to form a high-pressure air intake branch. Both ends of the fifth valve 16 are connected to the outlet end of the first valve 10 and the inlet end of the second buffer tank 21 to form a buffer air intake branch. The gas supply pressure of the high-pressure air intake branch is adapted to the high-pressure pressure of the liquefaction device to achieve energy-saving operation of the liquefaction device. By using the high-pressure air intake branch and the buffer air intake branch in one and in the other, both the high-pressure air intake branch and the buffer air intake branch can be used for air supply, which can stabilize the pressure and flow, improve system reliability, and effectively solve the problem of control gas pressure and flow fluctuations.

[0030] Furthermore, it also includes a second electrically controlled valve 7 and a sixth valve 8 , and the second electrically controlled valve 7 is connected to the sixth valve 8 and the inlet end of the first buffer tank 9 in sequence.

[0031] In a specific implementation, the second electrically controlled valve 7 and the sixth valve 8 are used to control the on / off of the inlet end of the first buffer tank 9 . When the helium is qualified, the second electrically controlled valve 7 and the sixth valve 8 are opened to allow the helium to flow into the first buffer tank 9 .

[0032] Furthermore, it also includes a refining section, which is connected to the inlet end of the second electric control valve 7 through a refining section interface 1.

[0033] In a specific embodiment, the refining section is used to transport the process raw gas to facilitate the subsequent purification and liquefaction of helium.

[0034] Furthermore, it also includes a filtering unit, which includes at least two filtering groups connected in parallel, and the filtering group includes a filter 3 and a seventh valve 2 arranged on both sides of the filter 3. The filtering unit is arranged between the refining section and the inlet end of the second electric control valve 7.

[0035] In a specific embodiment, the filtering unit is used to filter particulate impurities in the helium raw gas. Two filters 3 are connected in parallel. The refining section is respectively connected to the two filters 3 and then connected to the inlet end of the second electric control valve 7. A seventh valve 2 is provided from the filter 3 to the inlet end of the second solenoid valve and the refining section to control the on and off of both sides of the filter 3. One of the two filters 3 is in use and the other is in standby.

[0036] Furthermore, it also includes a return section, which includes a backflow valve 5 of the measurement, control and distribution module, an eighth valve 4 and a directional neon content analyzer 6, and the two ends of the backflow valve 5 of the measurement, control and distribution module are respectively connected between the filtration unit and the inlet end of the second electric control valve 7 and the refining section, and the two sides of the directional neon content analyzer 6 are respectively connected to the two ends of the backflow valve 5 of the measurement, control and distribution module through the two eighth valves 4.

[0037] In a specific embodiment, the directional neon content analyzer 6 can detect the neon content of helium in the refining section. The two sides of the directional neon content analyzer 6 are connected to the backflow valve 5 of the measurement, control and distribution module through two eighth valves 4 respectively. When a high neon content is detected, the helium raw gas with unqualified neon content can be returned to the refining section, so as to constantly detect the process raw materials of the upstream refining section, control the neon content, improve the helium purity, enable the liquefaction device to operate continuously, and further improve the production efficiency of the helium liquid device.

[0038] Furthermore, it also includes a first peak helium gas supply valve group 17 and a second peak helium gas supply valve group 18, the first peak helium gas supply valve group 17 is arranged between the fifth valve 16 and the second buffer tank 21, the second peak helium gas supply valve group 18 is arranged between the high-precision filter 3 and the first inlet end of the cold box 22, and the first peak helium gas supply valve group 17 and the second peak helium gas supply valve group 18 are provided with interfaces.

[0039] In a specific embodiment, the first peak helium gas supply valve group 17 and the second peak helium gas supply valve group 18 are respectively arranged on the buffer gas intake branch and the high-pressure gas intake branch, and the transported helium can be connected to the buffer gas intake branch and the high-pressure gas intake branch through the interfaces on the first peak helium gas supply valve group 17 and the second peak helium gas supply valve group 18, which can not only process the incoming helium of the refining section, but also process the incoming helium of the peak process load (transported helium) to realize the centralized liquefaction of helium.

[0040] Furthermore, it also includes a liquid helium distribution box 23, wherein a first outlet end and a first inlet end of the liquid helium distribution box 23 are respectively connected to a second inlet end and a second outlet end of the cold box 22;

[0041] It also includes a liquid helium gas distribution interface 24 , which is connected to the second outlet and the second inlet of the liquid helium distribution box 23 .

[0042] In a specific implementation, the liquid helium distribution box 23 cooperates with the liquid helium gas distribution interface 24 to distribute liquid helium, and the liquid helium is stored in an external device or transported.

[0043] Of course, the present invention may have many other implementations. Based on this implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present invention.

Claims

1. A helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields, characterized in that: It includes a control unit and a liquefaction unit, wherein: The control unit includes a first buffer tank, a first valve, a second valve, a first electric control valve, a first check valve, a third valve, a fourth valve and a fifth valve; The liquefaction unit includes a compressor unit, a high-precision oil filter module, a second buffer tank and a cold box, the first outlet end of the cold box is connected to the compressor unit, the high-precision oil filter module and the first inlet end of the cold box in sequence, the first outlet end and the first inlet end of the second buffer tank are connected to the first inlet end and the second inlet end of the cold box, the outlet end of the first buffer tank is connected to the first valve, the first branch of the outlet end of the first valve is connected to the second valve, the first electric control valve, the first one-way valve, the third valve in sequence and connected to the first inlet end of the cold box, and the two ends of the fourth valve are respectively connected to the inlet end of the second valve and the outlet end of the third valve to form a high-pressure air intake branch, the second branch of the outlet end of the first valve is connected to the fifth valve and the second inlet end of the second buffer tank in sequence to form a buffer air intake branch.

2. The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields according to claim 1, characterized in that: It also includes a second electrically controlled valve and a sixth valve, wherein the second electrically controlled valve is sequentially connected to the sixth valve and the inlet end of the first buffer tank.

3. The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields according to claim 2, characterized in that: It also includes a refining section, which is connected to the inlet end of the second electric control valve through a refining section interface.

4. The helium liquefaction stage pressure and flow stabilizing gas intake system suitable for gas fields according to claim 3, characterized in that: It also includes a filtering unit, which includes at least two filtering groups connected in parallel. The filtering group includes a filter and a seventh valve arranged on both sides of the filter. The filtering unit is arranged between the refining section and the inlet end of the second electric control valve.

5. The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields according to claim 4, characterized in that: It also includes a return section, which includes a backflow valve of the measurement, control, and distribution module, an eighth valve, and a directional neon content analyzer. The two ends of the backflow valve of the measurement, control, and distribution module are respectively connected to the filtering unit to the inlet end of the second electric control valve and the refining section, and the two sides of the directional neon content analyzer are respectively connected to the two ends of the backflow valve of the measurement, control, and distribution module through the two eighth valves.

6. The helium liquefaction stage pressure and flow stabilizing gas intake system suitable for gas fields according to claim 1, characterized in that: It also includes a first peak helium gas supply valve group and a second peak helium gas supply valve group, the first peak helium gas supply valve group is arranged between the fifth valve and the second buffer tank, the second peak helium gas supply valve group is arranged between the high-precision filter and the first inlet end of the cold box, and interfaces are arranged on the first peak helium gas supply valve group and the second peak helium gas supply valve group.

7. The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields according to claim 1, characterized in that: It also includes a liquid helium distribution box, wherein a first outlet end and a first inlet end of the liquid helium distribution box are connected to a second inlet end and a second outlet end of the cold box respectively.

8. The helium liquefaction section pressure and flow stabilizing gas intake system suitable for gas fields according to claim 7, characterized in that: It also includes a liquid helium gas distribution interface, which is connected to the second outlet end and the second inlet end of the liquid helium distribution box.

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