A helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system suitable for a gas field

Abstract

The application provides a helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system suitable for a gas field, and particularly relates to the field of low-temperature refrigeration technology. The helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system is connected with a first valve through an outlet end of a first buffer tank. A first branch of the outlet end of the first valve is sequentially connected with a second valve, a first electric control valve, a first check valve, a third valve, and a first inlet end of a cold box, and a fourth valve is connected with the inlet end of the second valve and the outlet end of the third valve to form a high-pressure gas inlet branch. A second branch of the outlet end of the first valve is sequentially connected with a fifth valve and a second inlet end of a second buffer tank to form a buffer gas inlet branch. The two gas inlet branches can improve the stability of the helium liquefaction section pressure-stabilizing and flow-stabilizing gas inlet system, and can well control gas pressure and flow fluctuation.

Description

Technical Field

[0001] This invention relates to the field of cryogenic refrigeration technology, and in particular to a pressure-stabilized and flow-stabilized gas intake system for the helium liquefaction section of a gas field. Background Technology

[0002] The helium liquefaction unit is the key core equipment for realizing helium liquefaction. The pipeline raw gas entering the helium liquefaction stage usually goes through membrane separation, roughing, and refining processes. The pipeline raw gas may also contain neon and is affected by the wellhead and upstream process sections, resulting in pressure and flow fluctuations.

[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 is more expensive. If the neon content in the raw gas in the pipeline 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, thus affecting liquid helium production and consequently affecting the liquefaction efficiency of the helium liquefaction section.

[0004] Existing technologies include setting up process pipelines for direct connection before the helium liquefaction unit, but this method cannot effectively suppress pressure and flow fluctuations of pipeline natural gas feedstock with low helium content. Summary of the Invention

[0005] To address the problem of uncontrollable pressure and flow fluctuations in helium liquefaction gas intake systems, this invention proposes a pressure-stabilizing and flow-stabilizing gas intake system suitable for helium liquefaction sections in gas fields.

[0006] This invention is achieved through the following technical solution:

[0007] This invention proposes a pressure-stabilizing and flow-stabilizing gas intake system for the helium liquefaction section of 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 electrically controlled 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 filtration module, a second buffer tank, and a cold box. The first outlet of the cold box is sequentially connected to the compressor unit, the high-precision oil filtration module, and the first inlet of the cold box. The first outlet and first inlet of the second buffer tank are connected to the first inlet and second inlet of the cold box. The outlet of the first buffer tank is connected to the first valve. The first branch of the outlet of the first valve is sequentially connected to the second valve, the first electrically controlled valve, the first check valve, and the third valve, and is connected to the first inlet of the cold box. The two ends of the fourth valve are respectively connected to the inlet of the second valve and the outlet of the third valve to form a high-pressure air intake branch. The second branch of the outlet of the first valve is sequentially connected to the fifth valve and the second inlet of the second buffer tank 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, which is connected to the inlet end of the second electrically controlled valve via a refining section interface.

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

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

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

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

[0017] The beneficial effects of this invention are:

[0018] (1) The helium liquefaction section pressure and flow stabilization gas intake system proposed in this invention uses a high-pressure gas intake branch and a buffer gas intake branch for both use and backup. It can use the high-pressure gas intake branch for gas supply or the buffer gas intake branch for gas supply, which can stabilize pressure and flow, improve system reliability, and effectively solve the problem of control gas pressure and flow fluctuation.

[0019] (2) The helium liquefaction section pressure and flow stabilization gas intake system proposed in this invention is connected to the buffer intake branch and the high pressure intake branch through the interfaces on the first peak helium gas supply valve group and the second peak helium gas supply valve group to realize the centralized liquefaction of helium gas and to handle the peak process load helium gas.

[0020] (3) The helium liquefaction section pressure and flow stabilization gas intake system proposed in this invention is connected to the backflow valve of the measurement and control distribution module through two eighth valves on both sides of the directional neon content analyzer. When the neon content is detected to be high, the helium raw material gas with unqualified neon content can be returned to the refining section to improve the helium purity, so that the liquefaction unit can operate continuously and further improve the production efficiency of the helium gas-liquid unit. Attached Figure Description

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

[0022] In the diagram: 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 electrically controlled valve 7, sixth valve 8, first buffer tank 9, first valve 10, second valve 11, first electrically controlled valve 12, first check valve 13, third valve 14, fourth valve 15, fifth valve 16, first peak helium supply valve group 17, second peak helium supply valve 18, compressor unit 19, high-precision oil filtration module 20, second buffer tank 21, cold box 22, liquid helium distribution box 23, liquid helium distribution interface 24.

[0023] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0025] Please refer to Figure 1 This invention proposes a pressure-stabilized and flow-stabilized gas intake system for the helium liquefaction section of 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 electrically controlled 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 filtration module 20, a second buffer tank 21, and a cold box 22. The first outlet end of the cold box 22 is sequentially connected to the compressor unit 19, the high-precision oil filtration module 20, and the first inlet end of the cold box 22. 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 21 is connected to the first valve 10. The first branch of the outlet end of the first valve 10 is sequentially connected to the second valve 11, the first electrically controlled valve 12, the first check valve 13, and the third valve 14, and is connected to the first inlet end of the cold box 22. 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 air intake branch. The second branch of the outlet end of the first valve 10 is sequentially connected to the fifth valve 16 and the second inlet end of the second buffer tank 21 to form a buffer air intake branch.

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

[0029] The first branch at the outlet of the first valve 10 is sequentially connected to the second valve 11, the first electrically controlled valve 12, the first check valve 13, and the third valve 14, and is connected to the first inlet 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. The fifth valve 16 is connected at both ends to the outlet of the first valve 10 and the inlet of the second buffer tank 21 to form a buffer air intake branch. The air supply pressure of the high-pressure air intake branch is adapted to the high pressure of the liquefaction unit to achieve energy-saving operation of the liquefaction unit. By using the high-pressure air intake branch and the buffer air intake branch in a standby configuration, 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 the system reliability, and effectively solve the problem of control air pressure and flow fluctuation.

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

[0031] In a specific implementation, the second solenoid valve 7 and the sixth valve 8 are used to control the opening and closing of the inlet end of the first buffer tank 9. When the helium is qualified, the second solenoid 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 electrically controlled valve 7 via a refining section interface 1.

[0033] In a specific implementation, the refining section is used to transport and distribute process feedstock gases to facilitate subsequent purification and liquefaction of helium.

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

[0035] In a specific implementation, the filtration unit is used to filter particulate impurities in the helium raw material gas. Two filters 3 are connected in parallel. The refining section is connected to the two filters 3 and then to the inlet of the second solenoid valve 7. A seventh valve 2 is provided on both sides of the filter 3 from the inlet of the second solenoid valve to the refining section to control the opening and closing of the filter 3. One filter 3 is used and the other is kept on standby.

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

[0037] In a specific implementation, the directional neon content analyzer 6 can detect the neon content of helium in the refining section. The directional neon content analyzer 6 is connected to the backflow valve 5 of the measurement and control distribution module through two eighth valves 4 on both sides. When the neon content is detected to be high, the helium raw material gas with unqualified neon content can be returned to the refining section. This allows for constant monitoring of the process raw materials in the upstream refining section, controlling the neon content to improve helium purity, enabling the liquefaction unit to operate continuously, and further improving the production efficiency of the helium-liquid unit.

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

[0039] In a specific implementation, the first peak helium supply valve group 17 and the second peak helium supply valve group 18 are respectively set on the buffer inlet branch and the high-pressure inlet branch. The transferred helium can be connected to the buffer inlet branch and the high-pressure inlet branch through the interfaces on the first peak helium supply valve group 17 and the second peak helium supply valve group 18. It can not only process the incoming helium from the refining section, but also process the incoming helium from the peak process load (transferred helium), so as to realize the centralized liquefaction of helium.

[0040] Furthermore, it also includes a liquid helium distribution box 23, wherein the first outlet end and the first inlet end of the liquid helium distribution box 23 are respectively connected to the second inlet end and the 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, in conjunction with the liquid helium gas distribution interface 24, distributes liquid helium and stores it in an external device or transfers it.

[0043] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A pressure-stabilizing and flow-stabilizing gas intake system for the helium liquefaction section of a gas field, 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 electrically controlled 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 filtration module, a second buffer tank, and a cold box. The first outlet of the cold box is sequentially connected to the compressor unit, the high-precision oil filtration module, and the first inlet of the cold box. The first outlet and first inlet of the second buffer tank are connected to the first inlet and second inlet of the cold box. The outlet of the first buffer tank is connected to the first valve. The first branch of the outlet of the first valve is sequentially connected to the second valve, the first electrically controlled valve, the first check valve, and the third valve, and is connected to the first inlet of the cold box. The two ends of the fourth valve are respectively connected to the inlet of the second valve and the outlet of the third valve to form a high-pressure air intake branch. The second branch of the outlet of the first valve is sequentially connected to the fifth valve and the second inlet of the second buffer tank to form a buffer air intake branch. Helium enters the circulation loop through the second buffer tank for liquefaction. It also includes a first peak helium supply valve group and a second peak helium supply valve group. The first peak helium supply valve group is located between the fifth valve and the second buffer tank, and the second peak helium supply valve group is located between the high-precision filter and the first inlet end of the cold box. The first peak helium supply valve group and the second peak helium supply valve group are provided with interfaces.

2. The helium liquefaction section pressure-stabilizing and flow-stabilizing gas intake system 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 connected in sequence to the sixth valve and the inlet end of the first buffer tank.

3. The helium liquefaction section pressure-stabilizing and flow-stabilizing gas intake system for gas fields according to claim 2, characterized in that, It also includes a refining section, which is connected to the inlet of the second electrically controlled valve via a refining section interface.

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

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

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

7. The helium liquefaction section pressure-stabilizing and flow-stabilizing gas intake system for gas fields according to claim 6, characterized in that, It also includes a liquid helium gas distribution interface, which is connected to the second outlet and the second inlet of the liquid helium distribution box.

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