A gas methane value regulating device and regulating process

Abstract

The present invention provides a gas methane value regulating device and a regulating process, belonging to the technical field of methane extraction. The gas methane value regulating device comprises a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, a primary pressure regulating valve, a gas-liquid separator and a secondary pressure regulating valve. The present invention arranges a spiral guide plate and a guide plate. When the gas enters the interior of a separation tank through a feed inlet, the gas can flow through a spiral channel of the spiral guide plate. The guide plate is subjected to a thrust during the flow of the gas, and can drive the spiral guide plate and the gas guide pipe to rotate. The rotating spiral guide plate can promote the downward flow of the gas inside the separation tank, thereby increasing the flow rate of the gas and improving the separation efficiency. At the same time, the rotation of the spiral guide plate can enhance the centrifugal force of the gas and improve the quality of gas-liquid separation.

Description

Technical Field

[0001] The invention belongs to the technical field of methane extraction, and in particular relates to a gas methane value regulating device and a regulating process. Background Art

[0002] Gas generally refers to combustible gas used for heating, cooking and power generation. It can be made from a variety of different raw materials, mainly including natural gas, manufactured gas and biomass gas. Natural gas is a naturally occurring fossil fuel, mainly composed of methane (CH4), and also contains other hydrocarbon and non-hydrocarbon impurities. In addition, increasing the methane content can increase the calorific value of gas, thereby improving its competitiveness in the energy field.

[0003] A methanogenic gas-liquid separation tank with publication number CN219764788U comprises a tank body and a filter screen frame; a filter cover for fixing a pipe A is screwedly connected to the outer side of the tank body, a box for collecting liquid is screwedly fixed to the bottom of the tank body, a condenser for cooling the gas entering the tank body is screwedly fixed to the inside of the tank body, a fixing frame for protecting the condenser is screwedly fixed to the outer side of the condenser, a pipe B for collecting gas is threadedly connected to one side of the tank body, and a filter screen for filtering the liquid entering the box body is screwedly fixed to the inner side of the tank body; the above scheme solves the problem that the existing methanogenic gas-liquid separation tank cannot improve the efficiency of gas-liquid separation when in use, and is inconvenient to filter the collected liquid and adsorb the odor in the gas through the filter cover, condenser, fixing frame, adsorption screen, filter screen, box body and connecting cone.

[0004] Although the gas-liquid separation tank similar to the above-mentioned one solves the problem of inconvenience in filtering the collected liquid and adsorbing the odor in the gas, its gas-liquid separation efficiency for methane is still poor; and, the methane gas will still carry some smaller droplets during the removal process, reducing the effect of methane gas-liquid separation; at the same time, the droplets carried by methane will remain in the gas discharge channel, and these droplets will gradually be converted into other hydrocarbon compounds, resulting in affecting the quality of subsequent methane gas.

[0005] Therefore, in order to solve the above problems, it is necessary to provide a gas methane value regulating device and a regulating process. Summary of the invention

[0006] The purpose of the present invention is to provide a gas methane value regulating device and regulating process, aiming to solve the problem in the prior art that the gas flow rate is too slow, when the gas rotates on the spiral guide plate, the inertia of the liquid will become smaller, the centrifugal force will become weaker, and the liquid cannot be completely separated from the gas, resulting in the separated gas carrying liquid, affecting the gas-liquid separation quality.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a gas methane value regulating device, comprising a primary heat exchanger, a secondary heat exchanger, a tertiary heat exchanger, a primary pressure regulating valve, a gas-liquid separator and a secondary pressure regulating valve; the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger are connected in sequence to cool the gas, and the gas after cooling is depressurized by the primary pressure regulating valve and transported to the interior of the gas-liquid separator; the gas-liquid separator comprises a separation tank body, a feed inlet, a liquid discharge port, an air outlet and a buffer plate, the top inner wall of the separation tank body is fixedly connected with a connecting pipe connected with the air outlet, and the bottom of the connecting pipe is sealed and rotatably connected with a gas guide tube connected with the interior of the separation tank body To tube; the outer wall of the gas guide tube is fixedly connected with a spiral guide piece, and the outer wall of the spiral guide piece is sealingly and rotatably connected to the inner wall of the separation tank body; the inlet at the top of the spiral guide piece is fixedly connected with a guide plate, and the guide plate is inclined along the spiral direction of the spiral guide piece; the inside of the gas guide tube is fixedly connected with a connecting plate, the bottom of the connecting plate is fixedly connected with a fixing rod, the bottom of the fixing rod is fixedly connected with a guide rod, the outer wall of the fixed rod is slidably connected with a sealing plate slidably connected to the inner wall of the gas guide tube, the outer wall of the guide rod is slidably connected with a driven ring, and a gas-liquid filter screen slidably connected to the inner wall of the gas guide tube is provided below the driven ring.

[0008] Preferably, the gas-liquid separator is used to separate methane-rich gas and other heavy hydrocarbon liquids from the fuel gas. The separated methane-rich gas is reduced in pressure by the secondary pressure regulating valve and transported to the interior of the tertiary heat exchanger and the primary heat exchanger in sequence. The other heavy hydrocarbon liquids separated by the gas-liquid separator are transported to the interior of the secondary heat exchanger.

[0009] Preferably, when the gas enters the interior of the separation tank through the feed port, the guide plate can be subjected to the thrust of the gas flow and can drive the spiral guide blade and the gas guide tube to rotate.

[0010] Preferably, a guide groove is formed on the outer wall of the guide rod.

[0011] Preferably, a plurality of one-way valves are provided inside the sealing plate.

[0012] Preferably, a guide block which is slidably connected to the inner wall of the guide groove is fixedly connected to the inner side of the driven ring.

[0013] Preferably, the driven ring, the sealing plate and the gas-liquid filter are all connected to each other via a connecting rod.

[0014] Preferably, a square through groove is penetrated through the middle of the gas-liquid filter, and a square rod is fixedly connected to the top of the buffer plate. The square rod is slidably arranged inside the square through groove. When the gas guide tube rotates, the guide block can move inside the guide groove, and the driven ring can move back and forth up and down inside the gas guide tube.

[0015] Preferably, the outer diameter of the driven ring is smaller than the inner diameter of the gas guide tube, and the gas entering the gas guide tube can pass through the gas-liquid filter, the driven ring, the one-way valve and the connecting plate in sequence and enter the interior of the connecting tube.

[0016] The present invention also discloses a process for adjusting the methane value of fuel gas, comprising the following steps:

[0017] S1. Cooling: The gas transported from the dehydration system is cooled by heat exchange through the primary heat exchanger, the secondary heat exchanger, and the tertiary heat exchanger in sequence;

[0018] S2. Separation: The gas after cooling is then regulated and depressurized by the first-stage pressure regulating valve. After the pressure regulation, hydrocarbon compounds above C2 are condensed due to the throttling effect and enter the gas-liquid separator to separate the methane-rich gas and other heavy hydrocarbon liquids;

[0019] S3. Heat exchange: The methane-rich gas separated by the gas-liquid separator is regulated and reduced in pressure by the secondary pressure regulating valve. The methane-rich gas after pressure regulation and temperature reduction enters the third-stage heat exchanger and the first-stage heat exchanger in turn to exchange heat with the fuel gas transported by the dehydration system to increase the temperature. The heated methane-rich gas is sent to the dual-fuel engine;

[0020] S4. Collection: Other heavy hydrocarbon liquids separated from the gas-liquid separator enter the secondary heat exchanger for heat exchange, and after heating, are transported to the dehydrocarbon washing tower for collection and treatment.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention arranges the spiral guide blade and the guide plate, and the gas enters the separation tank body and circulates in the spiral channel of the spiral guide blade, so that the guide plate is driven by the thrust of the gas flow to drive the spiral guide blade and the gas guide tube to rotate, and the rotating spiral guide blade can push the gas inside the separation tank body to flow downward faster, thereby increasing the flow rate of the gas in the separation tank body, thereby improving the separation efficiency. At the same time, when the spiral guide blade rotates, it can enhance the centrifugal force exerted on the gas in the separation tank body, thereby improving the quality of gas-liquid separation.

[0023] The present invention provides a sealing plate and a gas-liquid filter screen, and the gas-liquid filter screen can filter small droplets carried in the gas. During the rotation of the guide rod, the guide block will slide along the inner wall of the guide groove, so that the driven ring can reciprocate up and down inside the gas guide tube, and then drive the sealing plate and the gas-liquid filter screen to move up and down synchronously through the connecting rod. When the driven ring moves downward, the outer wall of the gas-liquid filter screen can scrape the residual liquid on the inner wall of the gas guide tube to prevent the liquid from remaining on the inner wall of the gas guide tube. When the driven ring moves upward, the sealing plate can squeeze the gas inside the connecting tube upward, so as to accelerate the discharge of methane gas from the gas outlet; when the sealing plate moves downward, the pressure inside the connecting tube will be less than the pressure inside the separation tank body, thereby forming a negative pressure above the sealing plate, so that the gas inside the separation tank body enters the inside of the connecting tube faster; the reciprocating movement of the sealing plate can improve the methane gas emission efficiency, and the reciprocating movement of the gas-liquid filter screen can clean and scrape the residual liquid on the inner wall of the gas guide tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0025] In the attached picture:

[0026] Figure 1 This is the overall structural diagram of the gas-liquid separator of the present invention.

[0027] Figure 2 It is a schematic diagram of the internal structure of the separation tank of the present invention.

[0028] Figure 3 It is a structural schematic diagram of the connecting pipe of the present invention.

[0029] Figure 4 It is a schematic structural diagram of the guide plate of the present invention.

[0030] Figure 5 Schematic diagram of the internal structure of the gas guide tube of the present invention.

[0031] Figure 6 It is a structural schematic diagram of the fixing rod of the present invention.

[0032] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0033] Figure 8 It is a schematic diagram of the position of the guide block of the present invention.

[0034] Fig. 9 It is a schematic diagram of the process flow of the gas methane value adjustment process of the present invention.

[0035] In the figure: 1. primary heat exchanger; 2. secondary heat exchanger; 3. tertiary heat exchanger; 4. primary pressure regulating valve; 5. gas-liquid separator; 51. separation tank; 52. feed inlet; 53. liquid discharge outlet; 54. gas outlet; 55. buffer plate; 56. connecting pipe; 57. gas guide pipe; 58. spiral guide plate; 59. guide plate; 510. connecting plate; 511. fixing rod; 512. guide rod; 513. guide groove; 514. sealing plate; 515. one-way valve; 516. driven ring; 517. guide block; 518. gas-liquid filter; 519. connecting rod; 520. square through groove; 521. square rod; 6. secondary pressure regulating valve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0037] Embodiment 1

[0038] During the gas-liquid separation process of the gas-liquid separator, the gas in a gas-liquid mixed state can rotate along with the spiral guide vane, and the liquid can be separated from the gas due to its own gravity and centrifugal force. However, during the separation process, the gas needs to flow through the spiral guide vane by itself to achieve gas-liquid separation, and the efficiency is slow. In addition, it is affected by the gas flow rate. If the gas flow rate is too slow, the gas rotates on the spiral guide vane, and the centrifugal force of the gas rotation will weaken, resulting in the inability to completely separate the liquid from the gas, causing the gas to still carry more liquid, affecting the quality of gas-liquid separation.

[0039] See also Figure 1-Figure 9 The present invention provides the following technical solution: a gas methane value regulating device, comprising a primary heat exchanger 1, a secondary heat exchanger 2, a tertiary heat exchanger 3, a primary pressure regulating valve 4, a gas-liquid separator 5 and a secondary pressure regulating valve 6.

[0040] The primary heat exchanger 1 , the secondary heat exchanger 2 and the tertiary heat exchanger 3 are connected in sequence to cool the gas. The gas after cooling is depressurized by the primary pressure regulating valve 4 and transported to the inside of the gas-liquid separator 5 .

[0041] The gas-liquid separator 5 is used to separate the methane-rich gas and other heavy hydrocarbon liquids in the fuel gas. The separated methane-rich gas is reduced in pressure by the secondary pressure regulating valve 6 and transported to the inside of the tertiary heat exchanger 3 and the primary heat exchanger 1 in sequence. The other heavy hydrocarbon liquids separated by the gas-liquid separator 5 are transported to the inside of the secondary heat exchanger 2.

[0042] The gas-liquid separator 5 includes a separation tank body 51, a feed port 52, a liquid discharge port 53, an air outlet 54 and a buffer plate 55. The top inner wall of the separation tank body 51 is fixedly connected with a connecting pipe 56 connected with the air outlet 54, and the bottom of the connecting pipe 56 is sealed and rotatably connected with a gas guide pipe 57 connected with the interior of the separation tank body 51.

[0043] The buffer plate 55 is mainly used to buffer the impact of the medium airflow on the liquid accumulation at the bottom of the separator.

[0044] The tertiary heat exchanger 3 is connected with the feed port 52 through the primary pressure regulating valve 4, and the gas inside the tertiary heat exchanger 3 can enter the interior of the separation tank body 51 through the primary pressure regulating valve 4. The gas outlet 54 is connected with the tertiary heat exchanger 3 through the secondary pressure regulating valve 6. The tertiary heat exchanger 3 is connected with the primary heat exchanger 1. The gas inside the separation tank body 51 can enter the tertiary heat exchanger 3 and the primary heat exchanger 1 in sequence through the gas guide pipe 57, the connecting pipe 56, the gas outlet 54 and the secondary pressure regulating valve 6, and can exchange heat with the fuel gas transported by the dehydration system inside the tertiary heat exchanger 3 and the primary heat exchanger 1. The liquid discharge port 53 is connected with the secondary heat exchanger 2, and the liquid inside the separation tank body 51 can enter the interior of the secondary heat exchanger 2 through the liquid discharge port 53, and can exchange heat with the fuel gas transported by the dehydration system inside the secondary heat exchanger 2.

[0045] A spiral guide piece 58 is fixedly connected to the outer wall of the gas guide tube 57 , and the outer wall of the spiral guide piece 58 is sealingly rotatably connected to the inner wall of the separation tank body 51 .

[0046] The gas entering the separation tank body 51 through the feed port 52 can flow in the spiral channel of the spiral guide blade 58 and can generate centrifugal swirl motion to form centrifugal force. The liquid is separated from the gas under the action of gravity and centrifugal force.

[0047] like Figure 4 As shown, a guide plate 59 is fixedly connected to the inlet at the top of the spiral guide blade 58, and the guide plate 59 is inclined along the spiral direction of the spiral guide blade 58, that is, the guide plate 59 is inclined along the direction of gas flow.

[0048] After the gas enters the separation tank 51 through the feed port 52, it flows in the spiral channel of the spiral guide blade 58. At this time, the guide plate 59 is thrusted by the flow of the gas, thereby driving the spiral guide blade 58 and the gas guide tube 57 to rotate.

[0049] The spiral guide blade 58 generates a rotational driving force during its rotation, which can push the gas inside the separation tank body 51 to move downward, thereby increasing the flow rate of the gas in the separation tank body.

[0050] It should be noted that when the gas in a gas-liquid mixed state enters the separation tank body 51 through the feed port 52, the gas-liquid mixed gas can flow through the spiral channel of the spiral guide blade 58 to form a centrifugal swirl motion. During this process, the guide plate 59 will be subjected to the thrust of the gas flow, driving the spiral guide blade 58 and the gas guide tube 57 to rotate. The rotating spiral guide blade 58 can push the gas inside the separation tank body 51 to flow downward, which can increase the flow rate of the gas and improve the separation efficiency. At the same time, the rotation of the spiral guide blade 58 can enhance the centrifugal force of the gas and improve the quality of gas-liquid separation.

[0051] The present invention arranges the spiral guide blade 58 and the guide plate 59. When the gas enters the separation tank body 51 through the feed port 52, the gas can flow through the spiral channel of the spiral guide blade 58. The guide plate 59 is subjected to the thrust of the gas flow, driving the spiral guide blade 58 and the gas guide tube 57 to rotate. The rotating spiral guide blade 58 can push the gas inside the separation tank body 51 to flow downward faster, thereby increasing the flow rate of the gas and the separation efficiency. At the same time, the rotation of the spiral guide blade 58 can enhance the centrifugal force of the gas and improve the quality of gas-liquid separation.

[0052] Embodiment 2

[0053] On the basis of the above embodiment, since the rotation of the spiral guide blade 58 can improve the efficiency of gas-liquid separation, the methane gas and liquid at the bottom of the separation tank body 51 will increase, and the methane gas will easily mix with the separated small droplets in the process of entering the gas guide tube 57, resulting in the discharged methane gas carrying smaller liquids. In order to further improve the quality of gas-liquid separation, it is necessary to avoid the discharged methane gas carrying smaller liquids.

[0054] See also Figure 1-Figure 8 A connecting plate 510 is fixedly connected to the inside of the gas guide tube 57, a fixing rod 511 is fixedly connected to the bottom of the connecting plate 510, a guide rod 512 is fixedly connected to the bottom of the fixing rod 511, and a guide groove 513 is formed on the outer wall of the guide rod 512.

[0055] The outer wall of the fixed rod 511 is slidably connected to a sealing plate 514 which is slidably connected to the inner wall of the gas guide tube 57. A plurality of one-way valves 515 are arranged inside the sealing plate 514. The arrangement of the one-way valves 515 enables the gas to flow only from the bottom to the top of the sealing plate 514. The outer wall of the guide rod 512 is slidably connected to a driven ring 516. The inner side of the driven ring 516 is fixedly connected to a guide block 517 which is slidably connected to the inner wall of the guide groove 513. A gas-liquid filter screen 518 which is slidably connected to the inner wall of the gas guide tube 57 is arranged below the driven ring 516. The driven ring 516, the sealing plate 514 and the gas-liquid filter screen 518 are all connected to each other through a connecting rod 519.

[0056] The gas-liquid filter screen 518 is arranged below the guide rod 512. A square through groove 520 is opened in the middle of the gas-liquid filter screen 518. A square rod 521 is fixedly connected to the top of the buffer plate 55. The square rod 521 is slidably arranged inside the square through groove 520. The square through groove 520 and the square rod 521 cooperate with each other, so that the gas-liquid filter screen 518 can only slide up and down in the gas guide tube 57 without relative rotation.

[0057] The gas entering the gas guide pipe 57 can enter the interior of the connecting pipe 56 through the one-way valve 515 .

[0058] When the gas guide tube 57 rotates, the guide block 517 can move inside the guide groove 513 , and the driven ring 516 can reciprocate up and down inside the gas guide tube 57 .

[0059] When the driven ring 516 moves upward to the extreme position, the sealing plate 514 will contact the connecting plate 510, and the gas-liquid filter screen 518 will just contact the bottom end of the guide rod 512. When the driven ring 516 moves downward to the extreme position, the bottom of the gas-liquid filter screen 518 will just be flush with the bottom end surface of the gas guide tube 57.

[0060] There is a gap between the connecting plate 510 and the inner wall of the gas guide tube 57 , and the guide groove 513 is arranged in a wave shape.

[0061] The outer diameter of the driven ring 516 is smaller than the inner diameter of the gas guide tube 57, and there is a gap between the driven ring 516 and the gas guide tube 57; the gas can pass through the gap between the driven ring 516 and the gas guide tube 57, and the gas entering the gas guide tube 57 can pass through the gas-liquid filter 518, the driven ring 516, the one-way valve 515 and the connecting plate 510 in sequence and then enter the interior of the connecting tube 56.

[0062] The gas-liquid filter 518 is used to separate the fine droplets carried by the methane gas. The gas-liquid filter 518 is a prior art and will not be described in detail here.

[0063] The methane gas separated from the separation tank 51 can enter from the bottom of the gas guide tube 57, and will first pass through the gas-liquid filter 518 to separate the fine droplets carried by the methane gas, causing the fine droplets to fall. Then the methane gas passes through the driven ring 516, the one-way valve 515 and the connecting plate 510 and enters the interior of the connecting tube 56.

[0064] The gas-liquid filter 518 separates the fine droplets carried by the methane gas, causing the fine droplets to fall. Long-term use will cause the small droplets to remain on the inner wall of the gas guide tube 57. If they are not cleaned in time, after the gas-liquid separation is stopped, as time goes by, the temperature of the separation tank body 51 will increase and return to normal temperature, causing the liquid hydrocarbon compounds on the inner wall of the gas guide tube 57 to become gas and remain inside the separation tank body 51. When the gas-liquid separation is performed again later, the separated methane gas will carry other hydrocarbon compound gases, affecting the quality of the separated methane gas.

[0065] It should be noted that when the gas enters the separation tank body 51 through the feed port 52, it can flow through the spiral channel of the spiral guide plate 58, so that the guide plate 59 is subjected to the thrust of the gas flow, which can drive the spiral guide plate 58 and the gas guide tube 57 to rotate. When the gas guide tube 57 rotates, it can drive the fixed rod 511 and the guide rod 512 to rotate through the connecting plate 510. During the rotation of the guide rod 512, the guide block 517 can move inside the guide groove 513, and the driven ring 516 can reciprocate up and down inside the gas guide tube 57. The driven ring 516 drives the sealing ring 516 through the connecting rod 519. The plate 514 and the gas-liquid filter 518 move synchronously. When the driven ring 516 moves downward, the gas-liquid filter 518 can scrape the residual liquid on the inner wall of the gas guide tube 57. When the driven ring 516 moves upward, the sealing plate 514 moves upward to squeeze the gas inside the connecting tube 56, thereby accelerating the discharge of methane gas. When the sealing plate 514 moves downward, the pressure inside the connecting tube 56 will be lower than the pressure inside the separation tank body 51, and the gas inside the separation tank body 51 will accelerate to enter the interior of the connecting tube 56. Therefore, the reciprocating movement of the sealing plate 514 can improve the methane gas discharge efficiency.

[0066] In summary, the present invention provides the sealing plate 514 and the gas-liquid filter 518, and the gas-liquid filter 518 can filter the small droplets carried in the gas. During the rotation of the guide rod 512, the guide block 517 can move inside the guide groove 513, and the driven ring 516 drives the sealing plate 514 and the gas-liquid filter 518 to move up and down inside the gas guide tube 57 through the connecting rod 519. When the driven ring 516 moves downward, the outer wall of the gas-liquid filter 518 can filter the residual liquid on the inner wall of the gas guide tube 57. Scrape, when the driven ring 516 moves upward, the sealing plate 514 moves upward, which can squeeze the gas inside the connecting pipe 56 and accelerate the emission of methane gas. When the sealing plate 514 moves downward, the pressure inside the connecting pipe 56 will be lower than the pressure inside the separation tank body 51, and the inside of the separation tank body 51 will accelerate the entry into the inside of the connecting pipe 56. Therefore, the reciprocating movement of the sealing plate 514 can improve the methane gas emission efficiency, and the reciprocating movement of the gas-liquid filter 518 can clean the residual liquid on the inner wall of the gas guide tube 57.

[0067] Embodiment 3

[0068] The present invention also discloses Fig. 9 A gas methane value adjustment process shown includes the following steps:

[0069] S1. Cooling: The gas transported from the dehydration system is sequentially cooled by heat exchange in the primary heat exchanger 1, the secondary heat exchanger 2, and the tertiary heat exchanger 3;

[0070] S2. Separation: The gas after cooling is then pressure-reduced by the primary pressure regulating valve 4. After the pressure regulation, hydrocarbon compounds above C2 are condensed due to the throttling effect and enter the gas-liquid separator 5 to separate the methane-rich gas and other heavy hydrocarbon liquids;

[0071] S3. Heat exchange: The methane-rich gas separated by the gas-liquid separator 5 is depressurized by the secondary pressure regulating valve 6. The methane-rich gas after pressure regulation and temperature reduction enters the tertiary heat exchanger 3 and the primary heat exchanger 1 in turn to exchange heat with the gas transported from the dehydration system to increase the temperature. The heated methane-rich gas is sent to the dual-fuel engine;

[0072] S4. Collection: The other heavy hydrocarbon liquid separated by the gas-liquid separator 5 enters the secondary heat exchanger 2 for heat exchange, and after being heated, is transported to the dehydrocarbon washing tower for collection and treatment.

[0073] The primary heat exchanger 1, the secondary heat exchanger 2 and the tertiary heat exchanger 3 are provided for multi-stage cooling to improve the cooling efficiency.

[0074] It should be noted that the gas transported by the self-dehydration system is successively subjected to heat exchange and cooling through the primary heat exchanger 1, the secondary heat exchanger 2, and the tertiary heat exchanger 3, and then the gas is adjusted to 2.0 MPa through the primary pressure regulating valve 4 for pressure reduction treatment, and is further cooled under the influence of the throttling effect, so that hydrocarbon compounds above C2 in the gas are condensed to form a gas-liquid mixed state of gas, which is then transported to the inside of the gas-liquid separator 5 for gas-liquid separation. The self-dehydration system is a prior art and will not be described in detail here.

[0075] The methane-rich gas separated by the gas-liquid separator 5 is reduced in pressure to 0.7 MPa by the secondary pressure regulating valve 6 for pressure reduction and temperature reduction, and then enters the tertiary heat exchanger 3 and the primary heat exchanger 1 in sequence for heat exchange and temperature increase with the fuel gas transported from the dehydration system.

[0076] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas methane value regulating device, characterized in that: It comprises a primary heat exchanger (1), a secondary heat exchanger (2), a tertiary heat exchanger (3), a primary pressure regulating valve (4), a gas-liquid separator (5) and a secondary pressure regulating valve (6); The first-stage heat exchanger (1), the second-stage heat exchanger (2) and the third-stage heat exchanger (3) are connected in sequence and are used to cool the gas. The gas after cooling is depressurized by the first-stage pressure regulating valve (4) and transported to the interior of the gas-liquid separator (5); The gas-liquid separator (5) comprises a separation tank body (51), a feed port (52), a liquid discharge port (53), a gas outlet (54) and a buffer plate (55); a connecting pipe (56) connected to the gas outlet (54) is fixedly connected to the inner wall of the top of the separation tank body (51); a gas guide pipe (57) connected to the inside of the separation tank body (51) is sealed and rotatably connected to the bottom of the connecting pipe (56); a spiral guide piece (58) is fixedly connected to the outer wall of the gas guide pipe (57); the outer wall of the spiral guide piece (58) is sealed and rotatably connected to the inner wall of the separation tank body (51); a guide plate (59) is fixedly connected to the inlet of the top of the spiral guide piece (58); the guide plate (59) is arranged obliquely along the spiral direction of the spiral guide piece (58); The gas guide tube (57) is fixedly connected to a connection plate (510) inside, the connection plate (510) is fixedly connected to a fixing rod (511) at the bottom, the fixing rod (511) is fixedly connected to a guide rod (512) at the bottom, the fixing rod (511) is slidably connected to a sealing plate (514) slidably connected to the inner wall of the gas guide tube (57) at the outer wall of the fixing rod (511), the guide rod (512) is slidably connected to a driven ring (516) at the outer wall, and a gas-liquid filter (518) slidably connected to the inner wall of the gas guide tube (57) is provided below the driven ring (516); When the gas enters the separation tank body (51) through the feed port (52), the guide plate (59) is subjected to thrust from the gas flow and can drive the spiral guide plate (58) and the gas guide pipe (57) to rotate; The outer wall of the guide rod (512) is provided with a guide groove (513); A plurality of one-way valves (515) are provided inside the sealing plate (514); A guide block (517) is fixedly connected to the inner side of the driven ring (516) and is slidably connected to the inner wall of the guide groove (513); The driven ring (516), the sealing plate (514), and the gas-liquid filter screen (518) are all connected to each other via a connecting rod (519); A square through slot (520) is formed through the middle of the gas-liquid filter (518); a square rod (521) is fixedly connected to the top of the buffer plate (55); the square rod (521) is slidably arranged inside the square through slot (520); when the gas guide tube (57) rotates, the guide block (517) can move inside the guide slot (513), and the driven ring (516) can move up and down inside the gas guide tube (57); The outer diameter of the driven ring (516) is smaller than the inner diameter of the gas guide tube (57), and the gas entering the gas guide tube (57) can sequentially pass through the gas-liquid filter (518), the driven ring (516), the one-way valve (515) and the connecting plate (510) and enter the interior of the connecting tube (56).

2. The gas methane value regulating device according to claim 1, characterized in that: The gas-liquid separator (5) is used to separate methane-rich gas from other heavy hydrocarbon liquids in the fuel gas; the separated methane-rich gas is depressurized by the secondary pressure regulating valve (6) and transported to the interior of the tertiary heat exchanger (3) and the primary heat exchanger (1) in sequence; and the other heavy hydrocarbon liquids separated by the gas-liquid separator (5) are transported to the interior of the secondary heat exchanger (2).

3. A gas methane value regulating process, applied to the gas methane value regulating device according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Cooling: The gas transported from the dehydration system is sequentially passed through the primary heat exchanger (1), the secondary heat exchanger (2), and the tertiary heat exchanger (3) for heat exchange and cooling; S2. Separation: The gas after cooling is then regulated and depressurized by a primary pressure regulating valve (4). After the pressure regulation, hydrocarbon compounds above C2 are condensed due to the throttling effect and enter the gas-liquid separator (5) to separate the methane-rich gas and other heavy hydrocarbon liquids; S3. Heat exchange: The methane-rich gas separated by the gas-liquid separator (5) is depressurized by the secondary pressure regulating valve (6). The methane-rich gas after pressure regulation and temperature reduction enters the tertiary heat exchanger (3) and the primary heat exchanger (1) in turn to heat exchange and heat up the gas transported by the dehydration system. The heated methane-rich gas is sent to the dual-fuel engine; S4. Collection: The other heavy hydrocarbon liquid separated by the gas-liquid separator (5) enters the secondary heat exchanger (2) for heat exchange, and after the temperature is increased, it is transported to the dehydrocarbon washing tower for collection and treatment.

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